WO2007139022A1 - Infrared light source and its fabrication method - Google Patents
Infrared light source and its fabrication method Download PDFInfo
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- WO2007139022A1 WO2007139022A1 PCT/JP2007/060711 JP2007060711W WO2007139022A1 WO 2007139022 A1 WO2007139022 A1 WO 2007139022A1 JP 2007060711 W JP2007060711 W JP 2007060711W WO 2007139022 A1 WO2007139022 A1 WO 2007139022A1
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- infrared light
- light source
- infrared
- wavelength
- specific wavelength
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01K—ELECTRIC INCANDESCENT LAMPS
- H01K1/00—Details
- H01K1/02—Incandescent bodies
- H01K1/14—Incandescent bodies characterised by the shape
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/10—Arrangements of light sources specially adapted for spectrometry or colorimetry
- G01J3/108—Arrangements of light sources specially adapted for spectrometry or colorimetry for measurement in the infrared range
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01K—ELECTRIC INCANDESCENT LAMPS
- H01K1/00—Details
- H01K1/02—Incandescent bodies
- H01K1/04—Incandescent bodies characterised by the material thereof
Definitions
- the present invention relates to an infrared light source that emits infrared light having a specific wavelength and a method for manufacturing the same.
- the present invention also relates to an analysis system and a monitoring system using an infrared light source.
- non-dispersive infrared absorption method as an analysis method for gases and liquids using infrared absorption of substances.
- the non-dispersive infrared absorption method is a method of measuring the concentration of a corresponding substance and the component ratio of a plurality of substances using infrared absorption lines specific to the substance.
- analysis systems using the non-dispersive infrared absorption method such as a stationary type incorporated in factory facilities and equipment and a portable type driven by a battery.
- FIG. 61 is a diagram showing a basic configuration of an analysis system using a non-dispersive infrared absorption method.
- the analysis system includes an infrared light source 301, a measurement cell 207, a means 211 for periodically changing the intensity, a wavelength selection element 303, an infrared sensor 203, and a demodulation means 205.
- the infrared light source 301 a white infrared light source (lamp) using black body radiation is exclusively used.
- the means 211 for periodically changing the intensity a chiba that periodically blocks infrared rays by rotating a radial slit or a shutter covering the light source is used.
- the selection element 303 a narrow band filter that transmits only a specific wavelength, such as a dielectric multilayer film, is used.
- the infrared sensor 203 various detectors such as a pyroelectric element, a porometer, a thermopile, and a heat flow sensor are used. Infrared rays from the infrared light source 301 pass through the measurement cell 207 including the measurement object, and enter the means 211 for changing the intensity periodically, the wavelength selection element 303, and the infrared sensor 203 in this order.
- FIG. 62 is a diagram showing the relationship between the absorbance of a measurement object (gas as an example), the intensity of a light source, and the transmittance of a wavelength selection element.
- FIG. 62 (a) shows the absorbance of the measurement target gas A with respect to the wavelength. The gas A to be measured exhibits a large absorption at the wavelength.
- Fig. 62 (a) shows the absorbance of the measurement target gas A with respect to the wavelength. The gas A to be measured exhibits a large absorption at the wavelength.
- FIG. 62 (c) is a diagram showing the transmittance of the wavelength selection element 303 with respect to the wavelength.
- the wavelength selection element 303 transmits only light in a narrow wavelength range around ⁇ .
- the amount of transmission of infrared light having a wavelength ⁇ varies depending on the concentration of the gas to be measured in the measurement cell.
- the output of the infrared sensor 203 also changes.
- the gas concentration is obtained by calculating based on Lambert's law from the ratio between the detected signal amount and the previously obtained reference signal amount. Note that ⁇ is not necessarily the wavelength at which absorption is maximum, and absorption and overlap of other gases that are mixed.
- this method often uses some reference signal because it is difficult to obtain a reliable result due to the influence of changes in the elements and the optical system over time.
- FIG. 63 is a diagram showing an analysis system that uses a reference sample.
- Gas ⁇ having a known composition is sealed in reference cell 207 ⁇ , and wavelength selection element 3031A and infrared sensor 203 ⁇ are installed for measuring the concentration of gas ⁇ .
- Gas ⁇ ⁇ to be measured is sealed in measurement cell 207 ⁇ , and wavelength selection element 3031B and infrared sensor 203B are installed for gas A concentration measurement.
- the concentration of gas A is obtained from the degree.
- the reference cell 207A contains the same type of gas as the measurement target gas.
- FIG. 64 is a diagram showing a two-wavelength analysis system. Large absorbance of target gas Install a wavelength selection element 3033 and infrared sensor 203A for infrared of the desired wavelength, and absorb the absorbance.
- the transmittance of the wavelength selection element 3033 with respect to the wavelength is shown in FIG. 62 (c).
- the characteristics of the selection element 303 are the same.
- the transmittance of wavelength selection element 3035 with respect to wavelength ⁇ is
- the analysis system uses infrared light having a specific wavelength determined by the measurement target substance.
- the infrared light source of the conventional analysis system emits infrared light in a wide wavelength range. Therefore, in the conventional analysis system, only infrared rays having wavelengths selected by a wavelength selection element such as a filter among infrared rays emitted from the infrared light source are used, and infrared rays having other wavelengths are discarded. Therefore, in the conventional analysis system, it is difficult to reduce the output of the infrared light source because much energy is wasted, and it is difficult to reduce the size of the infrared light source. As a result, conventional analytical systems are relatively large with low energy efficiency.
- a monitoring system for example, JP-A-2005-106523 that emits light of a specific wavelength by a light source and receives the light by a sensor is used. It is.
- a silicon sensor is often used as a light receiving element.
- Silicon sensors are highly sensitive in the 400 nanometer to 1000 nanometer range, so light in this range is often used in the system.
- the wavelength component in this range becomes a large noise component, which causes malfunction of the system.
- an infrared light source that emits light in the infrared wavelength region is required.
- infrared light sources that can provide strong intensity at specific wavelengths in the infrared wavelength region.
- an infrared light source that emits infrared light of a specific wavelength, which has a simple structure and can be applied to a wide range of fields.
- An infrared light source includes a heating element, and a lattice in which a portion functioning as a positive dielectric and a portion functioning as a negative dielectric are alternately formed in a constant direction at a constant cycle, It is characterized in that the radiation energy of the body is concentrated and radiated to infrared rays having a specific wavelength determined by the shape of the grating, which has a polarization plane orthogonal to the arrangement direction of the grating.
- an infrared light source having a simple structure and having a predetermined polarization plane and emitting infrared light of a specific wavelength can be obtained.
- FIG. 1 is a diagram showing a configuration of an infrared light source according to an embodiment of the present invention.
- FIG. 2 is a diagram showing an infrared intensity distribution with respect to wavelength.
- FIG. 3 is a flowchart showing a method for obtaining the grating depth D when the grating period P and the width T of a portion (such as a dielectric) functioning as a positive dielectric are determined in an infrared light source.
- FIG. 4 is a diagram showing a change in the intensity distribution of infrared rays emitted from an infrared light source when the grating depth D of the infrared light source is changed.
- FIG. 5 is a flowchart showing a method for obtaining the grating depth D and the width T of a portion (such as a dielectric) functioning as a positive dielectric when the grating period P is determined in an infrared light source.
- FIG. 6 is a diagram showing a change in infrared intensity ratio at a specific wavelength when the width T of a portion (dielectric material, etc.) functioning as a positive dielectric of an infrared light source is changed.
- FIG. 8 is a diagram showing a configuration of an infrared light source according to an embodiment of the present invention.
- FIG. 9 A diagram showing a configuration of an infrared light source according to another embodiment of the present invention.
- FIG. 12 is a diagram showing a configuration of an infrared light source according to another embodiment of the present invention.
- FIG. 14 A diagram showing a configuration of an infrared light source according to another embodiment of the present invention.
- FIG. 16 is a diagram showing a configuration of an infrared light source according to another embodiment of the present invention.
- FIG. 17A A diagram showing the configuration of a grating of an infrared light source according to another embodiment of the present invention.
- Fig. 17B is a diagram showing a configuration of a grating of an infrared light source according to another embodiment of the present invention.
- FIG. 18 is a diagram showing a configuration of a grating of an infrared light source according to another embodiment of the present invention.
- FIG. 19 A diagram showing a configuration of a grating of an infrared light source according to another embodiment of the present invention.
- FIG. 20] is a diagram conceptually showing the intensity distribution of infrared rays emitted by the embodiment of FIG.
- FIG. 21 is a diagram for explaining the first embodiment.
- FIG. 22 is a diagram for explaining the second embodiment.
- FIG. 23 is a diagram for explaining the third embodiment.
- FIG. 24 is a diagram for explaining the fourth embodiment.
- FIG. 25 is a diagram for explaining the fifth embodiment.
- FIG. 26 is a diagram for explaining the sixth embodiment.
- FIG. 27 is a diagram for explaining the embodiment 7.
- FIG. 28 is a diagram for explaining the eighth embodiment.
- FIG. 29 is a diagram for explaining the ninth embodiment.
- FIG. 30 is a diagram for explaining the tenth embodiment.
- FIG. 31 is a diagram for explaining the embodiment 11.
- FIG. 32 is a diagram for explaining the embodiment 12. 37] It is a diagram for explaining the embodiment 13.
- FIG. 35 is a diagram for explaining the embodiment 15.
- FIG. 40 is a diagram illustrating a cross section of a lattice in which a boundary surface between a portion functioning as a negative dielectric and a portion functioning as a positive dielectric forms a predetermined angle with the lattice surface in the twentieth embodiment.
- FIG. 42 In the infrared light source of Embodiment 20, the relationship between a predetermined angle and an infrared intensity ratio is shown.
- FIG. 43 shows a lattice in which a portion functioning as a positive dielectric is formed of a positive dielectric material and air (hollow), and a portion functioning as a negative dielectric is formed of a metal force in Embodiment 21 FIG.
- FIG. 45 is a diagram showing the relationship between the wavelength and the absorptance when the ratio of D1 and D2 of the grating of Embodiment 21 is changed.
- FIG. 46 is a diagram showing a configuration example of an infrared heater using the infrared light source of the present invention and the prior art.
- Fig. 47 A diagram showing the relationship between the wave number of surface waves and the angular frequency in the unit structure of the lattice.
- FIG. 49 is a diagram showing the relationship between the wavelength of an infrared light source and the infrared intensity according to an embodiment of the present invention. It is.
- FIG. 50 is a diagram showing the radiation directivity of an infrared light source according to an embodiment of the present invention.
- FIG. 51 is a diagram showing the relationship between the heating element surface temperature and the intensity of infrared rays emitted from the heating element.
- FIG.52 Shows the infrared intensity ratio of the infrared light source obtained according to the method shown in Fig. 3 and Fig. 5 when the specific wavelength is 2.5 micrometers.
- FIG. 53 shows the infrared intensity ratio of the infrared light source obtained according to the method shown in FIGS. 3 and 5 when the specific wavelength is 4.0 micrometers.
- FIG. 54 shows the infrared intensity ratio of the infrared light source obtained by the method shown in FIGS. 3 and 5 when the specific wavelength is 6 micrometers.
- FIG. 55 is a diagram showing a configuration of an analysis system according to an embodiment of the present invention.
- FIG. 56 is a diagram showing the infrared absorption of a gas to be measured and the radiation intensity of the infrared light source.
- FIG. 56 is a diagram showing the configuration of a reference sample type analysis system according to an embodiment of the present invention.
- Sono 58 is a diagram showing a configuration of a two-wavelength analysis system according to an embodiment of the present invention.
- FIG. 59 is a diagram showing a configuration of a six-wavelength five-component analysis system according to an embodiment of the present invention.
- FIG. 60 is a diagram showing an output pulse waveform of a power source that periodically changes power, output waveforms of infrared rays emitted from three infrared light sources, and output waveforms of two infrared sensors.
- FIG. 61 is a diagram showing a basic configuration of an analysis system using a non-dispersive infrared absorption method.
- FIG. 62 is a diagram showing the relationship between the absorbance of a measurement object (for example, gas), the intensity of a light source, and the transmittance of a wavelength selection element.
- a measurement object for example, gas
- [36] is a diagram showing an analysis system using a reference sample.
- FIG. 64 is a diagram showing a configuration of a two-wavelength analysis system.
- FIG. 65 is a diagram showing a system configuration of a sugar content meter.
- FIG. 66 is a diagram showing a system configuration of a moisture meter.
- FIG. 67 is a diagram showing a configuration of a monitoring system according to an embodiment of the present invention.
- FIG. 68 is a diagram showing a configuration of a monitoring system according to another embodiment of the present invention.
- FIG. 69 is a diagram showing a configuration of a monitoring system according to another embodiment of the present invention.
- FIG. 70 is a diagram showing a configuration of a monitoring system according to another embodiment of the present invention.
- FIG. 71 is a diagram showing a relative sensitivity with respect to wavelength of a PbSe photoconductive element.
- FIG. 72 is a diagram showing spectral components on the surface of sunlight.
- FIG. 73 is a diagram showing the reflection characteristics and radiation characteristics of the ground surface.
- FIG. 1 is a diagram showing a configuration of an infrared light source 100 according to an embodiment of the present invention.
- the infrared light source 100 includes a grating 101 and a heating element 107.
- the lattice 101 is provided on the surface of the heating element 107.
- the heating element 107 is, for example, a ceramic heater.
- a SiC heater or the like may be used.
- the lattice 101 is composed of a portion (such as a metal) 103 that functions as a negative dielectric and a portion (such as a dielectric) 105 that functions as a positive dielectric.
- the portion (metal or the like) 103 that functions as a negative dielectric may be a metal such as aluminum, gold, or silver.
- the portion 103 functioning as a negative dielectric may be formed by forming a metal film on the surface of an arbitrary material.
- the portion that functions as a positive dielectric (such as a dielectric) 105 may be, for example, a hollow or a semiconductor such as silicon.
- the period of the lattice 101 is represented by P
- the depth of the lattice 101 is represented by D
- the width of a portion 105 (such as a dielectric) that functions as a positive dielectric is represented by T.
- An arrow A in FIG. 1 indicates the direction of the plane of polarization of the light emitted from the infrared light source 100, which is perpendicular to the arrangement direction of the grating. This polarization plane will be described later.
- FIG. 2 is a diagram showing the intensity distribution of infrared rays with respect to the wavelength.
- the horizontal axis represents wavelength and the vertical axis represents radiant energy density.
- the radiant energy density is called intensity.
- the alternate long and short dash line represents the intensity distribution of infrared rays emitted by the heating element 107 without the grid 101! Infrared rays are gently distributed over a wide wavelength. The infrared rays emitted by the heating element 107 have all polarization planes.
- the solid line represents the intensity distribution of infrared rays emitted from the infrared light source 100. Represented by a solid line
- the infrared light intensity distribution emitted by the infrared light source 100 has a plurality of peaks, and the intensity at wavelengths other than the peaks is almost zero. Multiple peaks are identified numerically from the longest wavelength, such as the first peak and the second peak.
- the second peak wavelength is about 1/3 of the first peak wavelength in the structure shown in FIG. Also
- the area of the part surrounded by the horizontal axis and the one-dot chain line is equal to the area of the part surrounded by the horizontal axis and the solid line when comparing light sources that emit the same power. in this way
- the infrared light source 100 has a function of concentrating the radiant energy of the heating element on infrared rays having a specific wavelength.
- an infrared ray having a specific wavelength has a polarization plane orthogonal to the arrangement direction of the grating 101 (see FIG. 1).
- the ratio of the infrared ray intensity (B) emitted by the infrared light source 100 to the infrared ray intensity (A) emitted by the heating element at the first peak wavelength is shown as the infrared ray. It is called intensity ratio.
- an infrared light source having the specific wavelength can be obtained.
- the following describes how to fabricate an infrared light source that matches a specific wavelength with the first peak wavelength.
- FIG. 3 is a flowchart showing a method for obtaining the grating depth D when the grating period P and the width T of a portion (such as a dielectric) functioning as a positive dielectric are determined in an infrared light source. is there.
- step S3010 the grating period P and the width T of a portion (such as a dielectric) functioning as a positive dielectric are determined.
- a specific wavelength is ⁇
- the grating period P is
- the intensity of infrared light emitted from the infrared light source 100 may be obtained by calculation such as the FDTD method.
- the FDTD method simulates an electromagnetic field by differentiating Maxwell's equations.
- step S3020 the grating depth D is changed to determine the intensity distribution of infrared rays emitted from the infrared light source 100.
- FIG. 4 is a diagram showing a change in the intensity distribution of infrared rays emitted from the infrared light source when the grating depth D of the infrared light source is changed.
- the lattice depth in ( ⁇ ) is larger than the lattice depth in ( ⁇ )
- the lattice depth in (C) is larger than the lattice depth in ( ⁇ ).
- increasing the grating depth D increases the first peak wavelength. Therefore, by adjusting the grating depth D, the force S can be made to match the first peak wavelength ⁇ to a specific wavelength ⁇ .
- the first peak wavelength matches the specific wavelength.
- step S3030 it is determined whether or not the first peak wavelength ⁇ matches the specific wavelength ⁇ . If not, the process returns to step S3020 and further changes the lattice depth D. If they match, the grating depth D at that time is terminated as the grating depth of the infrared light source 100.
- Fig. 5 is a flowchart showing a method for obtaining the grating depth D and the width ⁇ of a portion (such as a dielectric) functioning as a positive dielectric when the grating period ⁇ is determined in an infrared light source. is there.
- step S5010 when a specific wavelength is used
- step S5020 the width ⁇ of the portion functioning as a positive dielectric (such as a dielectric) is changed, and the grating depth D and the grating depth at which the first peak wavelength matches the specific wavelength are changed.
- the infrared intensity ratio for the case. Specifically, after setting the width ⁇ of the portion functioning as a positive dielectric (such as a dielectric) to a certain value, the first peak wavelength matches the specific wavelength according to the flowchart of FIG. Find the infrared intensity ratio for depth D and its grating depth.
- the width ⁇ of the portion that functions as a positive dielectric such as a dielectric
- FIG. 6 is a diagram showing a change in the infrared intensity ratio at a specific wavelength when the width of a portion (dielectric, etc.) functioning as a positive dielectric of the infrared light source is changed.
- a portion (such as a metal) 103 that functions as a negative dielectric of the lattice 101 is gold, and a portion (such as a dielectric) 105 that functions as a positive dielectric is air.
- the horizontal axis in Fig. 6 is the ratio of the width ⁇ of a portion that functions as a positive dielectric (such as a dielectric) for a given grating period ⁇ , and the vertical axis is at a specific wavelength that coincides with the first peak. Infrared intensity ratio.
- the infrared intensity ratio at a specific wavelength shows a peak with respect to a specific value of the width ⁇ of a portion functioning as a positive dielectric (such as a dielectric).
- the specific wavelength is 9.6 micrometer
- the predetermined grating period ⁇ is 3 micrometer
- the infrared intensity ratio shows a peak when the width ⁇ of the portion functioning as a positive dielectric (dielectric, etc.) is 0.06 micrometer (60 nanometers). [0045] Further, from FIG. 6, the infrared intensity ratio at a specific wavelength is sufficiently large.
- the range is T ⁇ 0.5 P.
- step S 5030 in FIG. 5 it is determined whether or not the width T of the portion functioning as a positive dielectric (such as a dielectric) is a value corresponding to the peak of the infrared intensity ratio curve in FIG. If it does not correspond to the peak, the process returns to step S5020, and the width T of the part functioning as a positive dielectric (dielectric etc.) is further changed. If it corresponds to the peak, the width T of the portion that functions as a positive dielectric (such as a dielectric) at that time is the width of the portion that functions as the positive dielectric of the infrared light source 100 (such as a dielectric). finish.
- the width T of the portion functioning as a positive dielectric such as a dielectric
- Figure 7 shows the change in the infrared intensity ratio at a specific wavelength when the grating period P of the infrared light source is changed with the width T of the portion functioning as a positive dielectric (dielectric, etc.) constant.
- FIG. A portion (such as a metal) 103 that functions as a negative dielectric of the lattice 101 is gold, and a portion that functions as a positive dielectric (such as a dielectric) 105 is air.
- the horizontal axis in FIG. 7 is the predetermined grating period P, and the vertical axis is the infrared ray intensity ratio at a specific wavelength that coincides with the first peak. As shown in Fig.
- the infrared intensity ratio at a specific wavelength shows a peak for a specific value of the grating period P.
- the specific wavelength is 9.6 micrometer
- the width T of the part that functions as a positive dielectric (such as dielectric) is 400 nanometers.
- the infrared intensity ratio shows a peak when the grating period P is near a specific wavelength.
- the infrared intensity ratio at a specific wavelength is sufficiently large as follows.
- the grating period P is determined, and the grating depth D and the width T of a portion (such as a dielectric) functioning as a positive dielectric so that the infrared intensity ratio is maximized at a desired specific wavelength.
- the grating depth D is determined, the grating period P and the width T of the part (such as dielectric) functioning as a positive dielectric so that the infrared intensity ratio is maximized at the desired specific wavelength. May be determined.
- the width T of the dielectric material portion may be determined, and the grating period P and the grating depth D may be determined so that the infrared intensity ratio is maximized at a desired specific wavelength.
- the grating period P and the width T of the portion (such as a dielectric) functioning as a positive dielectric are determined so as to satisfy the following relationship.
- FIGS. 52 to 54 show the method shown in FIGS. 3 and 5 when the specific wavelength is 2.5 micrometer, 4.0 micrometer, and 6 micrometer, respectively. Therefore, the obtained infrared intensity ratio of the infrared light source is shown.
- Tables 1 to 3 show the methods shown in FIGS. 3 and 5 when the specific wavelengths are 2.5 micrometer, 4.0 micrometer, and 6.0 micrometer, respectively.
- the specifications of the infrared light source obtained according to are shown below.
- this grid is made up of a core made of a positive dielectric material. It can be regarded as a periodic arrangement of slab waveguides sandwiched by clad made of and having a finite length D.
- the physical phenomenon that is the basis of the infrared light source of the present invention is a resonance phenomenon that occurs when the surface wave mode of the slab waveguide is reflected from both end faces of a finite length.
- the positive dielectric is a substance having a positive real part of the dielectric constant
- the negative dielectric is a substance having a negative real part of the dielectric constant.
- the positive dielectric corresponds to a general non-metallic material, and specifically, glass, metal oxide, metal fluoride, ceramics, semiconductor, polymer, liquid, and the like. Air, other gases, and vacuum spaces are also included in the positive dielectric.
- the negative dielectric is a metal material in a frequency lower than the plasma frequency, that is, in the visible light or infrared light region, or a material in which a metal is combined with a positive dielectric material.
- negative dielectrics include materials that exhibit large lattice vibration resonance, such as silicon carbide and various ion crystals in the far-infrared light region, and semiconductor materials such as silicon in which carriers are excited.
- An interface between a negative dielectric and a positive dielectric generally has an electric field perpendicular to the interface, and the electromagnetic field takes a maximum value at the interface, and decays exponentially as the distance from the interface increases.
- a surface wave when a negative dielectric is a metal material is called surface plasmon.
- the optical characteristic of the entire grating is one unit structure constituting the grating, that is, a slab waveguide having a finite length. Usually determined by optical properties.
- Figure 47 shows the wave number of surface waves.
- core thickness T Decreases as the core thickness T decreases. That is, core thickness T, angular frequency ⁇ , and surface wave wavelength ⁇
- FIG. 48 is a diagram showing the relationship between the unit structure of the lattice and the surface wave.
- the part that functions as a negative dielectric and the part that functions as a positive dielectric are indicated by ⁇ and B, respectively, and the negative dielectric material is indicated by diagonal lines.
- the portion A that functions as a negative dielectric is formed of a negative dielectric material (for example, metal).
- the portion A that functions as a negative dielectric is formed by coating a positive dielectric material (for example, plastic) with a negative dielectric material (for example, metal).
- the length D of the waveguide is
- the first resonance mode (first peak wavelength) and the second resonance mode (second peak wavelength) are specified by numbers. From the above, in a slab waveguide having a finite length, in each resonance mode, if one of the angular frequency ⁇ , the core thickness ⁇ , and the waveguide length D is determined, the remaining one is determined. Is determined.
- the period ⁇ does not affect the resonance, but in reality, the conditions under which the resonance mode occurs are also affected by the period ⁇ .
- the period ⁇ is a value close to the wavelength ⁇ in the air corresponding to the angular frequency ⁇ , the influence of the period ⁇ ⁇ ⁇ ⁇ on the conditions in which the resonance mode occurs is particularly large. Therefore, slab waveguides with a finite length are periodically arranged. In each grating mode, if one of the angular frequency ⁇ , core thickness T, waveguide length D, and period ⁇ is determined, the remaining one is determined.
- the resonance mode in this lattice has an electric field component perpendicular to the interface between the positive dielectric and the negative dielectric
- the plane wave having a plane of polarization perpendicular to the arrangement direction of the lattice and the electromagnetic field are symmetrical. Match. Therefore, when resonance mode is excited in the lattice.
- this resonance mode cannot emit a plane wave having a polarization plane parallel to the arrangement direction of the grating.
- FIG. 49 is a diagram showing the relationship between the wavelength of the infrared light source and the infrared intensity according to an embodiment of the present invention. Calculation results (left scale) and experimental results (right scale) are shown.
- the temperature of the heating element is 250 ° C, and the radiation intensity per unit area is about 0.01 to O.lW / cm 2 /; ⁇ !!
- the grating area of the infrared light source is about several mm square and the surface temperature is 250 °. In the case of C, at least a few meters is a detectable distance.
- the grating area of the infrared light source was 8mm square and the surface temperature was 250 ° C, it could be detected using a general triglycine sulfate detector or even several meters away from the infrared light source.
- the triglycine sulfate detector is an infrared detector that uses the pyroelectric effect, which is an effect of changing the charge due to heat generated by light irradiation.
- the detectable wavelength range is particularly wide. Although it is a feature, it is less sensitive than other detectors. Infrared intensity that can be detected at a distance of several meters even with this low sensitivity detector is obtained.
- FIG. 50 is a diagram showing the radiation directivity of the infrared light source according to one embodiment of the present invention.
- infrared light is emitted only from the grating, and is emitted only in the half space so that it is maximized in the normal direction.
- the radiation pattern is the same as that of a general planar light source.
- FIG. 8 is a diagram showing a configuration of an infrared light source according to an embodiment of the present invention.
- a lattice 101 composed of a portion (metal or the like) 103 that functions as a negative dielectric is provided on the heating element 107.
- a portion (such as a dielectric) 105 that functions as a positive dielectric is hollow.
- a portion (metal or the like) 103 that functions as a negative dielectric of the lattice and a heating element 107 are housed in a metal case 109.
- the metal case 109 suppresses infrared radiation from other than the lattice 101.
- the metal of the case 109 may be the same kind of metal as the part 103 (metal etc.) functioning as a negative dielectric of the lattice or a different kind of metal.
- the infrared light source according to the present embodiment can be manufactured by the following procedure.
- a metal film is formed on the heating element 107, a resist is applied, and a lattice pattern is formed by electron beam drawing or mask exposure, followed by etching.
- a metal film is formed on the heating element 107 and imprinted by a grid-shaped mold heated to a high temperature to form a lattice pattern on the metal.
- vacuum deposition or sputtering is used to form a metal film.
- FIG. 9 is a diagram showing a configuration of an infrared light source according to another embodiment of the present invention.
- a metal lattice convex portion (a portion (metal or the like) functioning as a negative dielectric of the lattice) 103 is provided on the heating element 107.
- the portion (dielectric etc.) 10 5 that functions as a positive dielectric is hollow.
- the metal lattice projection 103 and the heating element 107 are housed in a metal case 109.
- the metal case 109 suppresses infrared radiation from other than the lattice 101.
- the metal in case 109 may be the same type of metal as the negative dielectric of the lattice (metal, etc.) 103 or a different metal! /.
- the infrared light source according to the present embodiment can be manufactured by the following procedure.
- a metal film is formed on the heating element 107, a resist is applied, and the grid pattern is formed by electron beam drawing or mask exposure. A turn is formed, and then etching is performed.
- a metal film for example, vacuum deposition or sputtering is used.
- FIG. 10 is a diagram showing a configuration of an infrared light source according to another embodiment of the present invention.
- a lattice shape may be formed on a positive dielectric material (such as a dielectric) 105, a metal film 111 may be formed thereon, and a material 103A may be further disposed.
- the material 103A is a bonding material such as a ceramic adhesive or an epoxy adhesive, or a metal.
- the positive dielectric material (dielectric etc.) 105 may be a semiconductor such as silicon.
- An antireflection coating 121 is provided on the infrared radiation surface of the infrared light source. Anti-reflection 121 coat improves the radiation efficiency of infrared light source. Heating element 107, metal film 11
- metal case 109 suppresses infrared radiation from other than the grating 101.
- the metal of the case 109 may be the same kind of metal as the metal film 111 or a different kind of metal.
- FIG. 11 is a diagram showing a configuration of an infrared light source according to another embodiment of the present invention.
- the material 103A also serves as a heating element.
- a lattice shape may be formed on a positive dielectric material (such as a dielectric) 105, a metal film 111 may be formed thereon, and a material 103A may be further disposed.
- the positive dielectric material (such as a dielectric) 105 may be a semiconductor such as silicon.
- An antireflection coating 121 is provided on the infrared radiation surface of the infrared light source. The radiation efficiency of the infrared light source is improved by the antireflection coating 121.
- Metal film 1 is provided on the infrared radiation surface of the infrared light source. The radiation efficiency of the infrared light source is improved by the antireflection coating 121.
- metal case 109 suppresses infrared radiation from other than the lattice 101.
- the metal in case 109 may be the same type of metal as metal film 111 or a different type of metal.
- FIG. 12 is a diagram showing a configuration of an infrared light source according to another embodiment of the present invention.
- a positive dielectric material (such as a dielectric) 105 such as a semiconductor also serves as a heating element.
- a lattice shape may be formed on a positive dielectric material (such as a dielectric) 105, a metal film 111 may be formed thereon, and a material 103A may be further disposed.
- An anti-reflection coating 121 is provided on the infrared radiation surface of the infrared light source. With anti-reflection coating 121, The radiation efficiency of the infrared light source is improved.
- the metal film 111, the material 103A, the positive dielectric material (such as a dielectric) 105, and the antireflection coating 121 are housed in a metal case 109.
- the metal case 109 suppresses infrared radiation from other than the lattice 101.
- the metal of case 109 can be the same or different metal as metal film 111.
- the infrared light source according to the embodiment shown in FIGS. 10 to 12 can be manufactured by the following procedure.
- a metal is deposited on a positive dielectric material (such as a dielectric) 105, a resist is applied, a lattice pattern is formed by electron beam drawing or mask exposure, and a metal film 111 and a material 103A are deposited. Thereafter, the film formation surface may be polished.
- the heating element 107 is used, the material 103A is connected to the heating element 107 with an adhesive or the like. Thereafter, a metal film is formed around the periphery to form the case portion 109.
- vacuum deposition or sputtering is used for forming a metal film.
- the grating period P and the width T of a portion (such as a dielectric) functioning as a positive dielectric can be reduced to 30 nanometers.
- the grating depth D can be increased up to about 50 times the width T of the dielectric material part (dielectric, etc.).
- FIG. 13 is a diagram showing a configuration of an infrared light source according to another embodiment of the present invention.
- the lens 131 has one surface that is flat and the other surface is convex, and the infrared light source 100 is provided on the convex surface so as to emit infrared rays toward the lens 131. Infrared rays emitted from the infrared light source 100 are collected by the lens 131.
- an antireflection coating 121 is provided on the plane of the lens 131. The radiation efficiency of the infrared light source is improved by the antireflection coating 121.
- FIG. 14 is a diagram showing a configuration of an infrared light source according to another embodiment of the present invention.
- the infrared light source 100 emits infrared rays toward the lens 131 on the flat surface of the lens 131 having one surface that is flat and the other surface convex. Infrared rays emitted from the infrared light source 100 are emitted by the lens 131.
- An antireflection coating 121 is provided on the convex surface of the lens 131. The radiation efficiency of the infrared light source is improved by the antireflection coating 121.
- FIG. 15 is a diagram showing a configuration of an infrared light source according to another embodiment of the present invention.
- a lens 101 is provided on the convex surface of the lens 131 having one surface which is flat and the other surface is convex.
- the heat generating body 107 is disposed at a position facing the convex surface of the lens 131.
- Infrared light emitted from the infrared light source 100 is converted into a specific wavelength by the grating 101 and condensed by the lens 131. Is done.
- An antireflection coat 121 is provided on the plane of the lens 131. The anti-reflection coating 121 improves the radiation efficiency of the infrared light source.
- FIG. 16 is a diagram showing a configuration of an infrared light source according to another embodiment of the present invention.
- a grating 101 is provided on the plane of the lens 131 having one surface that is a flat surface and the other surface that is a convex surface. Infrared light emitted from the infrared light source 100 is converted into a specific wavelength by the grating 101 and emitted by the lens 131.
- An antireflection coating 121 is provided on the convex surface of the lens 131. The radiation efficiency of the infrared light source is improved by the antireflection coating 121.
- the lens of the embodiment shown in FIGS. 13 to 16 has a plano-convex shape.
- the grating 101 may be provided on either surface of the plano-concave and concave-convex lenses.
- FIG. 17A is a diagram showing a configuration of a grating of an infrared light source according to another embodiment of the present invention.
- a plurality of gratings having different specific wavelengths are provided on a single chip heating element.
- the lattice depth D is constant, the lattice period P, and the width T of a portion that functions as a positive dielectric (such as a dielectric) is changed in each region. It is possible to change the peak wavelength of the region and increase the electric field strength.
- the lattice period P may be constant in each region. According to this embodiment, an infrared light source having a plurality of specific wavelengths can be obtained with one chip.
- FIG. 17B is a diagram showing a configuration of a grating of an infrared light source according to another embodiment of the present invention.
- a plurality of gratings having different specific wavelengths are provided on a single chip heating element.
- the width T of the portion functioning as a positive dielectric (dielectric, etc.) is constant, and the lattice period P and the lattice depth D are changed in each region. It is possible to change the peak wavelength of the region and increase the electric field strength.
- the lattice period P may be constant in each region.
- an infrared light source having a plurality of specific wavelengths can be obtained with one chip.
- FIG. 18 is a diagram showing a configuration of a grating of an infrared light source according to another embodiment of the present invention.
- the depth D is varied while the grating period P and the width T of the portion functioning as a positive dielectric (dielectric, etc.) are constant!
- FIG. 20 is a diagram conceptually showing the intensity distribution of infrared rays emitted by the embodiment of FIG. According to this embodiment, an infrared light source that emits infrared light in a predetermined wavelength band is provided. can get.
- FIG. 19 is a diagram showing a configuration of a grating of an infrared light source according to another embodiment of the present invention.
- a plurality of grids having different directions are provided on a one-chip heating element.
- infrared light sources having a plurality of specific wavelengths with different directions of polarization can be obtained.
- an infrared light source having a specific wavelength which has a simple structure and can be applied to a wide range of fields, can be obtained.
- FIGS. 21 to 45 a portion functioning as a negative dielectric and a portion functioning as a positive dielectric are denoted by A and B, respectively. Negative dielectric materials are indicated by diagonal lines.
- the lattice portion is formed directly on the flat surface formed on the substrate.
- Gold or the like (lb) is formed on the surface of a substrate (la) such as glass, a resist is applied thereon, and a lattice pattern is formed by electron beam drawing, interference exposure, mask exposure or the like.
- a lattice is produced on the surface by dry etching or the like.
- a master lattice is directly imprinted to create a lattice on the surface.
- a structure in which a resin (plastic) or glass is sandwiched between the substrate and gold may be used.
- the heating element (lc) is bonded to the substrate (la).
- An epoxy or ceramic adhesive (le) may be disposed between the heating element and the substrate. Covering the part of the substrate and the heating element other than the part corresponding to the grating with a metal (Id) having a high reflectance of infrared light suppresses unnecessary infrared light emission and improves energy efficiency.
- FIG. 51 is a diagram showing the relationship between the surface temperature of the heating element and the intensity of infrared rays emitted from the heating element.
- A2 in Fig. 51 shows the case where the surface of the heating element is covered with gold, and A1 shows the case where it is not covered. From FIG. 51, it can be confirmed that the intensity of infrared rays emitted from the heating element is suppressed by depositing gold on the heating element surface.
- the heating element temperature is 250 ° C and the grid area is several square mm, it is about 0.01 to 0.1 W m2 / um.
- a resist (2b) is applied to a substrate (2a) (resin, metal, semiconductor, etc., Si substrate in this embodiment) for forming a lattice portion (FIG. 22 (a)).
- a lattice pattern is formed by electron beam drawing, interference exposure, or mask exposure (Fig. 22 (b)), and an array of protrusions is produced by dry etching or the like (Fig. 22 (c)).
- Nano-imprinting technology may be used in the process of manufacturing the above protrusion array.
- the film thickness at this time is preferably several times the skin depth (20 to 30 nm for Au) on all surfaces.
- the atomic layer deposition (ALD) method with a highly uniform film thickness is effective.
- Methods for obtaining a relatively thick film include a method in which an Au ultrafine particle dispersion is applied by spin coating and then sintered, and an electrochemical method such as electrolytic plating and electroless plating.
- an adhesion layer such as Cr may be formed on the Au film in order to ensure adhesion with the adhesive applied after the Au film formation.
- a heating element (2d) (such as a heating element on which a resistance line pattern of the heater is formed) is bonded to the lattice produced as described above (Fig. 22 (e)).
- a heat-resistant epoxy or ceramic adhesive (2e) for bonding. If the adhesive is viscous, the grid will not be sufficiently filled with the adhesive. Therefore, it is preferable to use an adhesive that has a good fillability in the grid. In addition, when the adhesive becomes thick, problems such as peeling may occur due to the difference in linear thermal expansion coefficient. Therefore, it is preferable to fill the adhesive as thinly as possible. Further, in this embodiment, the adhesive also serves to maintain electrical insulation between the heater pattern of the heating element and Au.
- the structure of the portion to be filled with the adhesive is fine, so it is preferable to perform a vacuum defoaming treatment before bonding so that bubbles do not enter the adhesive.
- the Si substrate (2a) is removed from the Au surface by mechanical peeling or etching (FIG. 22 (f)).
- a mixed solution of HF: HN03: CH3COOH (or H20) or a KOH aqueous solution is preferably used.
- the etching rate can be greatly changed by the concentration of CH3COOH (or H20).
- the etching rate is anisotropic in the crystal plane orientation, and in the case of silicon, it is possible to obtain an etching rate of several m / min on the 100 and 110 planes.
- the Si substrate When the Si substrate is mechanically peeled in FIG. 22 (f), the Si substrate can be used a plurality of times by returning to FIG. 22 (d).
- the correctly transferred Au surface can change its shape due to the diffusion of Au atoms during long-term use, or foreign matter can be deposited in the cavity, which can change the radiation characteristics of the light source. There is sex. Therefore, it is effective to fill the cavity with a positive dielectric material (2f) such as Si02 or resin to improve stability (Fig. 22 (g)).
- Dielectric filling methods include CVD, ALD, Si02, Si3N4, A1203, Parylene, etc., vapor deposition, vacuum deposition, sputtering, etc., spin-on-glass (SOG), polyimide, etc. There are coats' heat curing and so on.
- the infrared light source is completed, and when current is passed through the heating element, infrared light is emitted from the Au surface in the direction of the arrow in the figure.
- the power of installing a heating element on the opposite surface where infrared rays radiate is used.
- the heating element is installed on the surface where infrared rays are emitted by using another manufacturing flow, or the grid itself ( A structure using 2c) as a heating element may be used.
- An important advantage of the method of removing the protrusion array after depositing Au on the protrusion array is that the surface of the Au that finally comes to the surface was in close contact with the smooth Si protrusion array. Therefore, a smooth Au surface can be obtained no matter what method is used to deposit the Au film.
- the outer shape of the Au surface is an exact transfer of the outer shape of the projection array. Therefore, it is possible to realize the infrared radiation characteristics exactly as designed.
- the surface of Au that appears on the surface during film formation is generally severely uneven due to the growth of crystal grains. .
- the thickness of the Au film generally differs between the top, side and bottom surfaces of the protrusions, it is not easy to make the Au film profile as designed. This surface will eventually become a bonding surface with the heating element and will not appear on the surface.
- thermoplastic resin or rubber substrate (3a) for the mold, a resist is applied to the Si substrate and the like, and a lattice pattern is formed by electron beam drawing, interference exposure, mask exposure, etc., and the resist is directly applied to the mold surface, and electron beam drawing, interference exposure, mask exposure is performed. It can be produced by a method of forming a lattice pattern by light or the like, a method of forming a fine pattern by dry etching, or a method of forming by mechanical processing.
- thermoplastic resin a resin having heat resistance can be used.
- injection molding, nanoimprinting molding, or the like can be used.
- Au or the like (3c) is formed on the surface of the thermoplastic resin or the like (FIG. 23 (b)).
- the film thickness of Au to be deposited must be several times the skin depth (20 to 30 nm for Au) on all surfaces.
- the atomic layer deposition (ALD) method having a highly uniform film thickness is effective as the film forming method.
- Methods for obtaining a relatively thick film include a method in which an Au ultrafine particle dispersion is applied by spin coating and then sintered, and an electrochemical method such as electrolytic plating and electroless plating.
- an adhesion layer such as Cr may be formed on the Au film in order to ensure adhesion with the adhesive applied after Au deposition.
- the lattice plane side of the resin substrate and the fixed substrate (3e) are bonded (FIG. 23 (c)).
- a heat resistant epoxy resin or ceramic adhesive (3d) for bonding.
- the adhesive is viscous, the lattice portion is not sufficiently filled with the adhesive, and therefore, it is preferable to use an adhesive having a good filling property to the lattice portion.
- the adhesive becomes thick, problems such as peeling may occur due to the difference in linear thermal expansion coefficient. Therefore, it is preferable to fill the adhesive as thinly as possible.
- the material of the fixed substrate to be bonded may be any metal, semiconductor, ceramic, glass, or the like as long as the lattice shape can be finally maintained.
- a metal having a higher reflectivity of infrared light it is not so important to cover the periphery.
- the substrate is coated with a metal having a higher reflectivity of infrared light, a higher suppression function of unnecessary infrared light can be expected.
- the infrared light source can be obtained by removing the thermoplastic resin substrate (3a) by dissolution with an organic solvent such as toluene, melting by high-temperature heating, ashing with oxygen plasma, mechanical peeling, or the like. ( Figure 23 (d)). Finally, by forming an electrical wiring directly on the Au film (3c) on the lattice surface and passing an electric current, infrared rays are emitted in the direction of the arrow in the figure. Alternatively, a heating element may be bonded to the fixed substrate (3e).
- the Au layer (3c) itself formed on the lattice portion acts as a heating element.
- a resin or rubber protrusion array may be used instead of the Si protrusion array.
- Such a projection array can also be produced by transfer from another master mold.
- the power that can be used to mechanically peel off either resin can be dissolved in an appropriate organic solvent such as toluene, xinone, or butanone.
- a mold When a mold is used as a master mold, a resist is applied to the mold surface, a lattice pattern is formed by a method such as electron beam drawing, interference exposure, or mask exposure, and a fine pattern is formed by dry etching or the like. To do.
- a master mold can be made using a Si substrate, etc., and the mold can be taken using a nickel electroplater.
- An important feature of this embodiment is that if only one master mold is produced, a rectangular shape with accurate dimensions and shape that is inexpensive and reproducible using the established plastic molding technology. This means that the lattice can be mass-produced.
- the stability of the Au surface shape can be improved by filling the cavity with a positive dielectric material as shown in FIG. 22 (g).
- an SOI substrate is used in which a Si02 layer (4b) is formed on a Si substrate (4a) and an S leakage (4g) is formed thereon.
- the surface orientation of the outermost Si layer (4g in Fig. 24) is set to the 110 direction, and the thickness is set to the depth of the lattice to be produced.
- Apply resist (4c) to the SOI substrate Fig. 24 (a)
- a lattice pattern is formed by drawing a child line, interference exposure, mask exposure, etc. (Fig. 24 (b)).
- the Si layer progresses perpendicularly to the surface due to the difference in the etching rate depending on the crystal plane, and when it reaches the Si02 layer, the etching is finished, and a Si rectangular lattice can be produced (Fig. 24 ( c)).
- Au (4d) is deposited on the Si lattice (Fig. 24 (d)).
- the film thickness at this time should be several times the skin depth (20-30 nm for Au) on all surfaces.
- the atomic layer deposition (ALD) method with a highly uniform film thickness is particularly effective.
- a film can be easily obtained, a method in which an Au ultrafine particle dispersion is applied by spin coating and then sintering, and an electrochemical method such as electrolytic plating and electroless plating are used.
- the lattice portion is filled with an adhesive (4e) such as an epoxy resin, and the heating element (4f) (in this example, a ceramic heater) is bonded (FIG. 24 (e)).
- an adhesive (4e) such as an epoxy resin
- the heating element (4f) in this example, a ceramic heater
- the ceramic heater shown as an example in Fig. 24 has a metal resistance wire pattern formed on a ceramic substrate by screen printing or the like.
- the adhesive used here is viscous or the like, the lattice portion is not sufficiently filled with the adhesive, and therefore, it is preferable to use an adhesive having a good filling property to the lattice portion. Also, when the adhesive becomes thicker, problems such as peeling may occur due to differences in the linear thermal expansion coefficient. Therefore, it is preferable to fill the adhesive as thinly as possible.
- the Si02 layer (4b) is etched with an aqueous HF solution, some! /, Or a buffered HF solution, to expose the Au in contact with SiO 2 (FIG. 24 (f)).
- the power of installing a heating element on the opposite surface from which infrared radiation is emitted is emitted.
- the heating element is installed on the surface from which infrared radiation is emitted, or part c is conductive.
- the structure with a lattice material itself as a heat generating element is also acceptable.
- an SOI substrate in which a Si02 layer (5b) is formed on a Si substrate (5a) and a Si layer (5e) is formed thereon is used.
- the surface orientation of the outermost Si layer (5e) is the 110 direction, and the thickness is set to the depth of the lattice to be fabricated.
- the plane orientation of the Si substrate (5a) is 100 directions.
- a resist (5c) is applied to the SOI substrate (Fig. 25 (a)), and a lattice pattern is formed by electron beam drawing, interference exposure, mask exposure, etc. (Fig. 25 (b)).
- a lattice pattern is formed by electron beam drawing, interference exposure, mask exposure, etc.
- the resist (5c) is similarly applied to the back surface of the Si substrate to form an opening pattern.
- a film of Au or the like is formed on the surface of the Si layer so as to be deposited also on the side surface and bottom surface of the groove (FIG. 25 (d)).
- the film thickness at this time must be several times the skin depth (20-30 nm for Au) on all surfaces!
- the atomic layer deposition (ALD) method with a highly uniform film thickness is particularly effective.
- Methods for easily obtaining a relatively thick film include a method in which an Au ultrafine particle dispersion is applied and then sintering, and an electrochemical method such as electrolytic plating and electroless plating.
- the Au layer (5d) itself acts as a heating element.
- This embodiment is different from the second embodiment shown in FIG. 22 and the fourth embodiment shown in FIG. There are few steps and the structure is simple.
- the stability of the Au surface shape can be improved by filling a cavity with a positive dielectric material as shown in Fig. 22 (g).
- a Si substrate having a thermal oxide film (Si02 film) (6b) thicker than the lattice depth on the surface is provided.
- the plane orientation of the Si substrate is 100 directions.
- a resist (6c) is applied to the substrate (Fig. 26 (a)), and a lattice pattern is formed by electron beam drawing, interference exposure, mask exposure, etc. (Fig. 26 (b)).
- An array of protrusions is fabricated on the Si02 surface by dry etching (Fig. 26 (c)).
- a resist (6c) is applied to the back surface of the Si substrate to form an opening pattern (FIG. 26 (d)).
- film deposition is particularly effective with high uniformity of film thickness and atomic layer deposition (ALD). Relatively thick / and easy to obtain a film include a method in which an Au ultrafine particle dispersion is applied by spin coating and then sintering, and an electrochemical method such as electrolytic plating and electroless plating.
- the Au surface also forms a rectangular lattice on the opposite surface, so that infrared light of another wavelength may also be emitted there.
- a filler epoxy adhesive, ceramic adhesive, metal, etc.
- (6e) is filled so as to cover the recess from the top of the Au film, and the upper force also forms Au (6f). Film and suppress unwanted infrared radiation (Fig. 26 (g))
- the Au layer (6d) itself formed on the lattice portion acts as a heating element.
- the feature of the present embodiment is that the bonding surface of Si02 and Au is used as a radiation surface, so that it is smooth and It is that an accurate surface of a single shape can be used as a radiation surface. Furthermore, since Si02 remains embedded in the cavity, the infrared radiation characteristics exactly as designed are maintained stably for a long period of time despite the fact that electret migration is likely to occur.
- Embodiment 7 (Fig. 27)
- a Si substrate (7a) having a thermal oxide film (Si02) (7b) equivalent to the lattice depth on the surface is used.
- the plane orientation of the Si substrate is 100 directions.
- a resist (7c) is applied to the substrate (FIG. 7 (a)), and a lattice pattern is formed by electron beam drawing, interference exposure, mask exposure, etc. (FIG. 27 (b)).
- Angled grid patterns can be controlled by controlling the drawing speed and temperature treatment before and after processing.
- a grating with a taper is created by controlling the etching angle during etching (Fig. 27 (c)).
- a film such as Au (7d) is deposited in this lattice groove by a film deposition method (Fig. 27 (e)).
- a film deposition method in addition to the vacuum deposition method and the sputtering method, an atomic layer deposition (ALD) method with particularly high film thickness is effective.
- ALD atomic layer deposition
- Methods for obtaining a relatively thick film include a method in which an Au ultrafine particle dispersion is applied by spin coating and then sintered, and an electrochemical method such as electrolytic plating and electroless plating.
- an adhesion layer such as Cr may be formed in order to ensure adhesion with the adhesive applied after Au is embedded.
- an infrared light source is completed by removing the Si substrate (7a) from the surface of the lattice composed of Au and Si02 by mechanical peeling, etching, laser lift-off, etc., and forming electrical wiring ( Fig. 2 7 (g)) 0
- the power to install a heating element on the opposite surface from which infrared radiation is emitted By using another manufacturing flow, a heating element is installed on the surface from which infrared radiation is emitted, or a grid (7 d) A structure using itself as a heating element may be used.
- Embodiment 8 (Fig. 28)
- a Si substrate (8a) having a surface Au (8b) equivalent to the lattice depth is used.
- the plane orientation of the Si substrate is 100 directions.
- a resist (8c) is applied to the substrate (FIG. 28 (a)), and a lattice pattern is formed by electron beam drawing, interference exposure, mask exposure, etc. (FIG. 28 (b)).
- a lattice with a tapered surface is fabricated by dry etching (Fig. 28 (c)).
- an oxide film (Si02) or the like is formed in this lattice groove by a film formation method, and is flattened until the Au surface appears by fluid polishing or MCP (Mechanochemical polishing), and then an Au film ( 8b) is formed (FIG. 28 (e)).
- the film formation method is particularly effective with a highly uniform film thickness / atomic layer deposition (ALD) method.
- An adhesion layer such as Cr may be formed to ensure adhesion with the adhesive applied to Au.
- a heating element (8g) in which gold or the like (8f) is formed on a surface other than the bonding surface is bonded with an adhesive (8e) (FIG. 28 (f)).
- a heat-resistant epoxy or ceramic adhesive is used for bonding.
- the adhesive is viscous, the lattice portion is not sufficiently filled with the adhesive, and therefore, it is preferable to use an adhesive having a good filling property to the lattice portion. Further, when the adhesive becomes thick, problems such as peeling may occur due to the difference in linear thermal expansion coefficient. Therefore, it is preferable to fill the adhesive as thinly as possible.
- an infrared light source is completed by removing the Si substrate (8a) from the surface of the lattice composed of Au and Si02 by mechanical peeling, etching, laser lift-off, etc., and forming electrical wiring ( Figure 28 (g)).
- the force of installing a heating element on the opposite surface from which infrared rays are radiated is installed on the opposite surface from which infrared rays are radiated.
- the heating element is installed on the surface that radiates infrared rays, or a scale (8b )
- a structure using itself as a heating element may be used.
- a Si substrate (9a) having a surface equivalent to the lattice depth, a thin layer, and a thermal oxide film (Si02) (9b) is used.
- the plane orientation of the Si substrate is 100 directions.
- a resist (9c) is applied to the substrate (FIG. 29 (a)), and a lattice pattern is formed by electron beam drawing, interference exposure, mask exposure, etc. (FIG. 29 (b)).
- Si02 is processed by dry etching to produce an array of protrusions on the surface (Fig. 29 (c)).
- Au (9d) is deposited on the lattice surface (Fig. 29 (d)).
- the film thickness of Au is all The thickness of all surfaces should be several times the skin depth (20 to 30 mm for Au).
- the atomic layer deposition (ALD) method with a highly uniform film thickness is effective as the film forming method.
- Methods for obtaining a relatively thick film include a method in which an Au ultrafine particle dispersion is applied by spin coating and then sintered, and an electrochemical method such as electrolytic plating and electroless plating.
- an adhesion layer such as Cr may be formed on the Au film in order to ensure adhesion with the adhesive applied after the Au film formation.
- a heating element (9f) is bonded to the surface on which Au or the like is formed (FIG. 29 (e)).
- a heat-resistant epoxy or ceramic adhesive (9e) for bonding.
- the adhesive has viscosity or the like, filling of the adhesive into the lattice portion becomes insufficient, so it is preferable to use an adhesive that has good filling properties into the lattice portion.
- the adhesive becomes thick, problems such as peeling may occur due to the difference in linear thermal expansion coefficient. Therefore, it is preferable to fill the adhesive as thinly as possible.
- this adhesive application process is preferably vacuum defoamed before bonding! /.
- the feature of the present embodiment is that an infrared light source filled with Si02 to the desired depth in the lattice groove is realized by adjusting the thickness of the initial thermal oxide film and the processing depth such as dry etching. It is to do.
- the structure in which Si02 is just filled to the surface is a special example.
- the plasma emission spectrum and mass spectrometer can be used in the reaction vessel. It is better to stop the etching (endpoint method) by detecting the moment when the etching reaches the Si layer from the Si02 layer by gas analysis.
- a special substrate such as an SOI substrate is required without relying on dry etching conditions. Therefore, it is possible to accurately produce a lattice with good reproducibility.
- a pair of rollers (10a, 10b) with an array of grooves on one surface is used and heated and pressed to emboss an array of protrusions on one side of a plastic sheet (Fig. 30 (a )).
- the technology to transfer a fine structure such as a hologram to polyester, polychlorinated butyl, polypropylene, etc. with a thickness of about 10-100 m is well established.
- A1 or Ag (10d) is deposited on this lattice by vacuum evaporation or sputtering.
- a protective layer (10e) such as polyester or polypropylene is formed on the film formation surface (FIG. 30 (c)).
- This layer may be used as an adhesive layer and attached to the surface of another object like a seal.
- An infrared light source can be realized by bonding this sheet to an arbitrary heating element (10f) to form electrical wiring (Fig. 30 (d)).
- the flexible sheet itself can be used as an infrared light source.
- a flexible infrared light source can also be realized by adhering to this sheet with a rubber heater in which a resistance wire pattern is embedded in the silicone rubber sheet.
- FIG. 31 shows a specific embodiment of a thermally insulated infrared light source.
- the infrared light source is produced by the method shown in FIG.
- Resist (1 lc) is applied to both sides of the SOI substrate (l la, l ib, 1 le) (Fig. 31 (a)), and an opening pattern is formed by electron beam drawing, mask exposure, etc. (Fig. 31). (b))). Next, it is processed to a depth that reaches the Si substrate (11a) by dry etching or the like to form an opening that separates the lattice portion and the outer peripheral portion (FIG. 31 (c)).
- a resist is applied again, a lattice pattern is formed in the central portion by electron beam drawing, interference exposure, mask exposure, and the like, and a lattice is produced in the infrared radiation portion by processing by wet etching or the like (Fig. 31 (d)).
- a resist is applied again, and a pattern is formed by electron beam drawing, interference exposure, mask exposure, etc. Then, deposit Au, etc. (l id), which will be the main body of the electrode and infrared light source (Fig. 31 (e)). There are two electrode pads on the outer circumference, which are connected to the grid through two beams.
- the film thickness of the Au film must be several times the skin depth (20 to 30 nm for Au) on all surfaces.
- the atomic layer deposition (ALD) method with a highly uniform film thickness is effective as the film forming method.
- Methods for obtaining a relatively thick film include a method in which an Au ultrafine particle dispersion is applied and then sintering, and an electrochemical method such as electrolytic plating and electroless plating.
- the Au layer (l id) itself formed on the lattice portion acts as a heating element.
- the Balta structure like 24 It is overwhelmingly smaller than the Balta structure like 24. If the heat capacity is reduced, the current required to reach the same temperature can be reduced, and the temperature when the current is changed at high speed, that is, the followability of the infrared light intensity is improved. In other words, an infrared light source capable of high-speed operation can be realized.
- the grid is further limited to the central region of the membrane, and that region is removed leaving a minimum number of beams to support from the surroundings, the grid is thermally insulated from the surroundings. .
- Such a structure is generally used in the field of micromachines.
- the lattice portion can be set to a high temperature while keeping the surrounding substrate close to room temperature. This can greatly improve the mountability of the infrared light source.
- the infrared light source chip can be easily used by die bonding to a metal package, connecting the electrode terminal of the package and the electrode pad of the chip by wire bonding, and vacuum-sealing.
- Figure 31 (h) shows the state before the cap is put on.
- thermally insulated infrared light sources as shown in Fig. 31 are arranged on the same chip, they operate independently without being influenced by each other. Therefore, light sources that emit infrared light with different wavelengths or different polarizations can be integrated on a single chip.
- the wavelength variable infrared light source can be scanned electrically without moving parts. Is realized.
- Such a light source is a portable and small-sized device with low power consumption, and is useful for measuring the infrared spectrum of any substance and identifying the substance. See embodiments 16 and 17.
- peripheral circuits such as a modulation circuit, a power distribution circuit, and a temperature feedback circuit required for driving the same are also provided. Can be installed. See embodiment 18.
- infrared detectors such as porometers and thermopiles can be mounted on a Si chip, so an infrared light source, infrared detector, and further on a single Si chip. Even necessary signal processing circuits can be integrated. See embodiment 19.
- FIG. 32 is a diagram showing a grid arrangement of an infrared light source in which a plurality of types of grids are provided on one heating element.
- One type of grating is a grating that emits one specific wavelength of infrared light polarized in one direction.
- Multiple types of gratings are gratings that emit infrared light with different polarization directions or specific wavelengths.
- Fig. 32 (a) is a diagram showing an arrangement of a grid in which a plurality of types of grids are provided on one heating element, and one type of grid occupies one region on the heating element.
- Fig. 32 (b) shows that a plurality of types of grids are provided on one heating element, and one type of grid is divided into a plurality of fine! It is a diagram showing the arrangement of! A plurality of types of lattices are periodically arranged on the checkerboard pattern so as to have the same area.
- Fig. 32 (c) is a diagram showing a grid arrangement in which the ratio of the area of each type of grid is adjusted. Due to the strong wavelength dependence of the Planck rule, gratings with different specific wavelengths generally differ in radiant intensity per unit area.
- the transmittance and reflectance of the optical system that guides the emitted infrared light generally have wavelength dependence and polarization dependence
- the ratio of the intensity of infrared light emitted from different types of gratings is It changes when you reach the place where it is used. Therefore, the ratio of the area of each type of grating is appropriately adjusted so that the radiation intensity from each type of grating has a desired ratio.
- the ratio of emissivity of each type of grating is adjusted appropriately while the area ratio remains constant.
- Fig. 32 (d) is a diagram showing an example of an arrangement including at least two arrangements of Figs. 32 (a), (b), and (c).
- FIG. 33 is a diagram showing a method of manufacturing an infrared light source package.
- An infrared light source package includes one or a plurality of infrared light sources and a terminal for supplying power from the outside. Each of the plurality of infrared light sources has a heating element, and power can be supplied to each heating element independently.
- One form of infrared light source package is sealed in a metal, ceramic, glass or other housing, and the inside is a vacuum, or inert gas such as N2, Ar, ⁇ , or Xe, or other gases.
- a getter material that encloses and adsorbs unnecessary gas as needed is also enclosed.
- the window material is made of infrared transmitting material such as Si, Ge, sapphire, ZnS, BaF2, CaF2, PbF2, and so on.
- Another form of infrared light source package is one that has no window material, is not sealed, and the infrared light source is exposed to the outside world.
- the ceramic substrate (13b) on which the heater pattern (13c) is printed is placed on the hermetic seal (13a), and the electrode (13d) and the heater pattern (13c) are coupled by wire bonding. Adhere the grid (13g) to the ceramic substrate (13b).
- the detailed manufacturing method is as follows.
- step 1 an adhesive (13e) is applied onto the ceramic substrate (13b). In addition, 13 g of metal grid is bonded.
- step 2 an insulating layer (13h) is coated on the ceramic substrate (13b). In addition, apply adhesive 13e. Furthermore, a metal grid (13 g) is adhered. [0184] In step 3, an adhesive 13e is applied to the surface of the ceramic substrate (13b) opposite to the surface on which the heater pattern 13c is disposed. Furthermore, a metal grid (13 g) is adhered.
- the inside of the cap (13i) should be filled with inert gas (Ar, ⁇ , etc.), halogen gas (12, Br2), etc.! /.
- FIG. 34 shows various forms of the infrared light source package.
- the window (14j) may have a lens function.
- the material of the window (14j) is Si, Ge, sapphire, Zn Se, BaF2, CaF2, PbF2, etc. that transmit infrared rays.
- FIG. 35 is a diagram showing a configuration of an infrared light source manufactured using a semiconductor chip (15d). By making each integrated infrared light source have a different polarization direction, different wavelength, and different area, various combinations of infrared light sources can be fabricated on the semiconductor chip (15d). On the semiconductor chip (15d), an electrode pad (15a), a lattice portion (15b), and a thermally insulated region (15c) are provided. The opening (15c) for thermal insulation is filled with a hollow or thermal insulating material.
- the thermal time constant can be reduced, enabling high-speed modulation.
- an independent infrared light source can be integrated on one chip.
- FIG. 36 shows a one-dimensional array of infrared light sources. 1 chip infrared light source emits Infrared wavelength
- each infrared light source By switching each infrared light source electrically, it becomes a wavelength scanning light emitting device with no moving parts.
- Compact, multi-wavelength infrared light source, infrared wavelength scanning element, infrared spectrometer, etc. can be realized by integrating and arraying infrared light sources.
- FIG. 37 shows a two-dimensional array of infrared light sources.
- each infrared light source By switching each infrared light source electrically, it becomes a wavelength scanning light emitting element having no moving parts.
- Compact, multi-wavelength infrared light source, infrared wavelength scanning element, infrared spectrometer, etc. can be realized by integrating and arraying infrared light sources.
- FIG. 38 is a diagram showing a configuration of an apparatus in which an array of an infrared light source (18a), an electrode pad (18b), a modulation circuit (18c), a temperature control circuit (18d), a noise cut circuit (18e), and the like are integrated. . If an electronic circuit is integrated in a chip, the number of electrode pads can be reduced, so that the space can be reduced.
- Figure 39 shows an infrared light source (27b) and infrared detector (27c) mounted on a single chip (27d). It is a figure which shows the structure of the light projection / reception element. Gas is introduced from the gas introduction part (27f) into the measurement cell (27e) and discharged from the gas discharge part (27g). The gas concentration can be measured by emitting an infrared light source having a wavelength matching the absorption wavelength of the gas to be analyzed and detecting the reflected light from the reflecting mirror (27d). By providing the infrared light source (27b) and the infrared detection element (27c) on one chip, a compact analysis system can be obtained.
- Embodiment 20 is the same as Embodiment 8.
- the manufacturing method is mainly described.
- design methods and functions are described.
- Fig. 40 shows a part functioning as a negative dielectric (19a) and a part functioning as a positive dielectric (
- 19b is a diagram showing a cross section of a lattice in which the boundary surface with the lattice surface forms a predetermined angle ⁇ with the lattice surface.
- Fig. 41 shows a method for obtaining a grating depth D and a predetermined angle ⁇ when the grating period P and the width T of a portion (such as a dielectric) functioning as a positive dielectric are determined in an infrared light source. It is a flowchart which shows.
- step S20010 the grating period P and the width T of a portion (such as a dielectric) functioning as a positive dielectric are determined.
- a specific wavelength is ⁇
- step S20020 the grating depth D and the predetermined angle ⁇ are changed to obtain the intensity distribution of infrared rays emitted from the infrared light source.
- step S20030 it is determined whether or not the first peak wavelength ⁇ matches the specific wavelength ⁇ . If not, the process returns to step S3020 and further changes the lattice depth D. If they match, the grating depth D and the predetermined angle ⁇ at that time are set as the grating depth and the predetermined angle of the infrared light source.
- FIG. 42 is a diagram showing a relationship between a predetermined angle and an infrared intensity ratio. The grid data is shown below.
- an infrared intensity ratio higher than that of a grating having a predetermined angle of 90 degrees can be obtained.
- the force is greater than 90 degrees, which is shown when the predetermined angle is 90 degrees or less, an infrared intensity ratio higher than the infrared intensity ratio of the grid having the predetermined angle of 90 degrees is obtained.
- Embodiment 21 is a lattice in which one or both of a part A functioning as a negative dielectric and a part B functioning as a positive dielectric are formed of a plurality of substances.
- Figure 43 shows that part B that functions as a positive dielectric is formed of a positive dielectric material (21b) such as Si and air (hollow), and part A that functions as a negative dielectric is gold. It is a figure which shows the lattice formed from (21a).
- Figure 44 shows that part B that functions as a positive dielectric is formed of a positive dielectric material (22b) such as Si and air (hollow), and part A that functions as a negative dielectric is gold. It is a figure which shows the grating
- FIG. 45 is a diagram showing the relationship between the wavelength and the absorption rate when the ratio of D1 to D2 in the lattice shown in FIG. 43 is changed.
- Increasing the Si depth D1 of the part B that functions as a positive dielectric shifts the first peak wavelength to the longer wavelength side. Therefore, when determining the grating depth D required to obtain a specific wavelength, if a positive dielectric material with a refractive index greater than air is used, the grating depth is compared with the case where all the grating portions are air. D can be reduced And the lattice processing becomes easier.
- the force S can be adjusted by adjusting the wavelength peak of the first peak wavelength by adjusting the depth ratio (D 1: D2) of at least two kinds of materials having different refractive indexes in the grating portion.
- the carbon dioxide concentration is detected by detecting the attenuation rate of infrared light of that wavelength.
- a laser heater or the like is conventionally used as a light source.
- the absorption of carbon dioxide is large, and there is no laser at a wavelength, so there are many cases where a laser with a near wavelength is used.
- the light intensity at wavelengths where absorption of carbon dioxide is large is small relative to the total energy.
- Infrared spectrometers have conventionally used silicon carbide light sources, halogen light sources, ceramic light sources, and the like, and the light from these light sources is dispersed using a filter or a diffraction grating.
- the infrared light source according to the present invention the load on the filter and the diffraction grating is reduced, and the efficiency is improved.
- Infrared analyzers use a light source such as a silicon carbide light source, a halogen light source, or a ceramic light source to separate specific light components with an infrared spectrometer, irradiate the sample, and measure the amount of reflection and transmission of the sample. To analyze the state of the specimen.
- a light source such as a silicon carbide light source, a halogen light source, or a ceramic light source to separate specific light components with an infrared spectrometer, irradiate the sample, and measure the amount of reflection and transmission of the sample.
- the load on the infrared spectrometer is reduced, and in some cases, the infrared spectrometer is unnecessary.
- the road surface is irradiated with infrared rays of 2 to 7 micrometers, which is the absorption wavelength of moisture, and information on the road surface condition is acquired by observing the amount of reflection with a sensor.
- the road surface is irradiated with infrared light having a wavelength that is absorbed by the soil, and the amount of reflection is observed by a sensor to obtain information on the road surface condition.
- a light-emitting diode or a laser diode is used as a light source.
- These light sources exist only at specific wavelengths.
- a light source having an arbitrary wavelength can be obtained. Therefore, it is possible to obtain more information regarding the road surface condition with the force S.
- Medical instruments that irradiate the human body with 8 to 14 micrometer far infrared rays are used.
- a lamp, a light emitting diode, a laser diode, or the like is used.
- a lamp since the wavelength range of light is wide, most of the input power is emitted as unnecessary light.
- the infrared light source according to the present invention a light source having a desired wavelength can be obtained, so that treatment can be performed efficiently.
- the sugar content meter measures sugar content or acidity by irradiating an object with infrared light and measuring the amount of transmission or absorption.
- halogen lamps, light emitting diodes, laser diodes, and the like are used as light sources. If a halogen lamp or the like is used, a cooling device is required and the size of the device increases.
- Light emitting diodes and laser diodes exist only at specific wavelengths. By using the infrared light source according to the present invention, a light source having a desired wavelength can be obtained, so that more information on sugar content can be acquired.
- the moisture meter measures the amount of moisture by irradiating the object with infrared light and measuring the amount absorbed by water molecules.
- a halogen lamp or the like is used as the light source. Because halogen lamps have a wide light wavelength range, most of the input power is emitted as unnecessary light.
- a light source having a desired wavelength is obtained. Therefore, the water content can be measured efficiently.
- It consists of a projector equipped with an infrared light source and a light receiver equipped with an infrared light sensor.
- the infrared light emitted from the light source is shielded by an object in the optical path and is not detected by the sensor, the presence of the object is detected.
- In-vehicle radars are used, for example, to detect the position of preceding vehicles and obstacles by emitting millimeter waves and infrared light and measuring their reflections.
- on-vehicle radars instead of expensive millimeter-wave radars, light-emitting diode and laser diode light source radars are beginning to be used. There are only light emitting diodes and laser diodes of a specific wavelength.
- the infrared light source according to the present invention, a light source having a desired wavelength can be obtained, so that more information can be acquired.
- Infrared heater combined with an infrared lamp and gold-coated reflector It is used to heat objects without contact.
- Conventional infrared lamps irradiate objects with infrared light in the V, wide, and wavelength range based on Planck's law. Infrared light with a wavelength that is difficult for the object to absorb is dissipated unnecessarily without being effectively used for heating, resulting in low efficiency.
- the infrared light source according to the present invention can be produced so as to emit only the absorption wavelength of the heating object, so that the object can be efficiently heated.
- the object may be a liquid or gas as well as a solid. This infrared heater is particularly effective for objects that show a clear absorption peak. Most gas, liquid, and polymer solids have such an absorption spectrum.
- a single grating may be used for this infrared light source. If the absorption spectrum of a 1S object has multiple peaks, broad peaks, or if you want to heat multiple substances at once, Combined radiation spectrum A plurality of lattices may be combined so that
- FIG. 46 (a) is a diagram showing an example of the configuration of an infrared heater using the infrared light source of the present invention.
- two elongated rectangular infrared light sources are fixed back to back and emit infrared light on both sides!
- the emitted infrared light is focused on one linear region by paraboloid mirrors on both sides.
- FIG. 46 (b) is a diagram showing an example of the configuration of an infrared heater using the infrared light source of the present invention.
- a flexible sheet-shaped infrared light source according to Embodiment 10 is bonded to the surface of a transparent cylindrical lens that transmits infrared light well, such as sapphire, so that one linear region is emitted. Infrared light is condensed.
- the configuration of FIG. 46 (b) is also an application example of the embodiment shown in FIGS.
- FIG. 46 (c) is a diagram showing an example of the configuration of an infrared heater using the infrared light source of the present invention.
- the flexible sheet-like infrared light source according to the embodiment 10 is adhered to the inner surface of the cylindrical holding substrate so as to radiate inward, and the infrared light is collected in one linear region. To be configured.
- FIG. 46 (d) is a diagram showing an example of the configuration of an infrared heater using a conventional infrared light source.
- a linear infrared lamp is fixed at the focal position of the parabolic mirror. Infrared rays are collected in a linear shape, and the collected object is heated.
- a sheet having a grating that emits infrared light of a specific wavelength on the surface has an arbitrary finite (not absolute zero! /) Temperature.
- the object By sticking to the surface of the object, the object can be changed to an infrared light source that emits infrared light having a specific wavelength and a specific polarization.
- the radiation spectrum distribution of the object it can be easily detected from other sources by infrared light, or vice versa. For example, if a sheet that emits infrared light that easily absorbs water is attached to the inner wall of the oven, the ability to selectively heat and cook moisture can be increased.
- infrared cameras have begun to be installed in automobiles to make it easier for pedestrians to see even at night and in poor weather conditions.
- a sheet with a high sensitivity wavelength of this camera is incorporated into clothes and shoes, and infrared rays are emitted using the human body as a heat source. If you shoot, you can improve the probability that the pedestrian will be recognized as a vehicle, and you can improve safety. Or, conversely, a certain object was prevented from being detected by a device that tracks infrared light of a specific wavelength! /
- the high temperature part of the object may be of a wavelength different from the specific wavelength. If it is covered with a sheet that emits infrared light, it will be possible to make detection difficult while maintaining the heat release function by radiation.
- an infrared light source is mounted on a chip as a one-dimensional or two-dimensional array.
- an infrared light source array that emits a plurality of wavelengths capable of high-speed response by making each infrared light source of the array have a small heat capacity and form as a whole.
- the infrared light source having a small heat capacity is, for example, the infrared light source according to the eleventh embodiment. If the heating element temperature is about 300 ° C, the entire infrared region with a wavelength of several meters or more can be covered. Since a thermal time constant on the order of milliseconds to seconds can be achieved, an operating frequency on the order of 10-2 to 102 Hz can be obtained.
- the gas to be specifically measured is, for example, so-called NOx such as carbon dioxide, carbon monoxide, sulfur dioxide, nitrogen monoxide and nitrogen dioxide, red made of different atoms such as ammonia, methane and propane. It is an externally active molecule.
- FIGS. 55 (a) to (c) are diagrams each showing a configuration of an analysis system according to an embodiment of the present invention.
- the analysis system according to the above embodiment includes an infrared light source 201, an infrared sensor 203, a demodulator 205, and a gas container (cell) 207.
- the infrared light source 201 is the infrared light source 100 shown in FIG. 1, and is determined by the shape of the grating having a polarization plane perpendicular to the arrangement direction of the grating (polarization plane in the direction A in FIG. 1). It is an infrared light source that emits infrared light of a specific wavelength.
- the infrared sensor 203 a pyroelectric sensor utilizing the fact that charges are generated on the surface of the dielectric when heated, a porometer, or a thermo pinole that is a thermocouple array may be used.
- FIG. 56 is a diagram showing the infrared absorption (FIG. 56 (a)) of the gas to be measured and the radiation intensity of the infrared light source 201 (FIG. 56 (b)).
- the specific wavelength emitted by the infrared light source 201 is set so as to coincide with the wavelength ⁇ that is convenient for measuring the concentration of the measurement target gas A (for example, the wavelength of the absorbance peak).
- the specific wavelength emitted from the infrared light source 201 is set to 4.3 m when the measurement target gas is carbon dioxide, and is set to 4.7 m when carbon monoxide is used.
- the infrared light source 201 can emit infrared light having a specific wavelength according to the characteristics of the measurement target, the wavelength selection element (filter or the like) of the conventional analysis system is unnecessary. In addition, since the infrared light source 201 can concentrate the energy of the heating element at a specific wavelength, the energy efficiency of the infrared light source 201 is higher than that of a conventional analysis system in which light other than the specific wavelength is discarded by the wavelength selection element. ,.
- the analysis system shown in Fig. 55 (a) further includes a chopper 211 for periodically changing the intensity of the measurement signal.
- Infrared light having a specific wavelength emitted from the infrared light source 201 passes through the measurement target gas in the gas container 207, and its intensity is periodically changed by the chiyotsuba 211, and then detected by the infrared sensor 203.
- the measurement signal detected by the infrared sensor 203 is demodulated by the demodulator 205 and output.
- the analysis system shown in Fig. 55 (b) further includes a power source 213 that periodically changes power.
- a power source 213 that periodically changes the power.
- the intensity of infrared rays emitted from the external light source 201 is changed.
- Infrared light having a specific wavelength emitted from the infrared light source 201 is detected by the infrared sensor 203 after passing through the measurement target gas in the gas container 207.
- the measurement signal detected by the infrared sensor 203 is demodulated by the demodulator 205 and output. Since the intensity of the infrared rays is changed by the power source 213 that periodically changes the power, there is no moving part such as a chiyotsuba and the configuration becomes simple.
- the analysis system shown in Fig. 55 (c) further includes a polarizing element 215 between the infrared light source 201 and the infrared sensor 203.
- the polarizing element 215 allows only light having a predetermined polarization plane to pass.
- a commercially available wire grid polarizer as a polarizing element in the wavelength range of 5 to 25 micrometers. You can power to use the child.
- the wire grid polarization element reflects the polarization component parallel to the wire and transmits the perpendicular polarization component.
- the infrared light source 201 emits infrared light of a specific wavelength, the same polarizing element can be used as it is even if the measurement object changes and the wavelength used changes.
- the polarizing element 215 also functions as a means for periodically changing the intensity.
- the polarizing element 215 may be configured to rotate around the optical axis as a central axis in a plane perpendicular to the optical axis. As the polarizing element 215 rotates, the intensity of the measurement signal changes periodically.
- FIGS. 57 (a) to 57 (c) are diagrams each showing a configuration of a reference sample type analysis system according to an embodiment of the present invention.
- the analysis system according to the above embodiment includes an infrared light source 201, infrared sensors 203 or 203A and 203B, demodulators 205 or 205A and 205B, and gas containers 207A and 207B.
- the infrared light source 201 is the infrared light source 100 shown in FIG. 1, and has a polarization plane (polarization plane in the direction A in FIG. 1) orthogonal to the arrangement direction of the grating and is determined by the shape of the grating.
- the gas container 207A contains a reference sample gas
- the gas container 207B contains a measurement target gas. Infrared light having a specific wavelength is emitted from the infrared light source 201 to the reference sample gas and the measurement target gas. Obtain the measurement output of the infrared sensor for the reference sample gas and the gas to be measured, and compare the two to obtain the concentration of the gas to be measured.
- the analysis system shown in Fig. 57 (a) further includes a chopper 211 for periodically changing the intensity of the measurement signal.
- Infrared light of a specific wavelength radiated from the infrared light source 201 passes through the reference sample gas in the gas container 207A and the measurement target gas in the gas container 207B, and the intensity periodically changes by the chopper 211.
- the measurement signals detected by the infrared sensors 203A and 203B are demodulated by the demodulators 205A and 205B, respectively, and output.
- the analysis system shown in Fig. 57 (b) further includes a power source 213 that periodically changes power to change the intensity of infrared rays emitted by the infrared light source 201.
- a power source 213 that periodically changes power to change the intensity of infrared rays emitted by the infrared light source 201.
- Infrared light having a specific wavelength emitted from the infrared light source 201 passes through the reference sample gas in the gas container 207A and the measurement target gas in the gas container 207B, and is then detected by the infrared sensors 203A and 203B.
- the measurement signals detected by the infrared sensors 203A and 203B are demodulated by the demodulators 205A and 205B and output.
- the analysis system shown in Fig. 57 (c) further includes a polarizing element 2151 between the infrared light source 201 and the infrared sensor 203.
- the polarizing element 2151 includes two regions, and the polarization directions of light passing through the two regions are orthogonal to each other.
- the polarizing element 2151 may be configured to rotate around the optical axis as a central axis in a plane perpendicular to the optical axis.
- the polarization element 2151 is rotated so that the output signal of the demodulator 205 is read when the polarization plane of the infrared light emitted from the infrared light source 201 and the polarization plane of the light transmitted by the polarization element 2151 coincide.
- Figs. 58 (a) to 58 (f) are diagrams each showing the configuration of a two-wavelength analysis system according to an embodiment of the present invention.
- the analysis system according to the embodiment includes the infrared light source 2011, the infrared sensors 203 or 203A and 203B, the demodulator 205 or 205A and 205B, and the gas container 207.
- An infrared light source 2011 is an infrared light source shown in FIG. 19 as an example, and a plurality of gratings having different directions are provided on a one-chip heating element.
- the infrared light source has polarization planes that have a plane of polarization orthogonal to the direction of arrangement of the respective gratings (polarization plane in the direction of A in FIG. 1) and have a specific wavelength determined by the shape of the grating and that have different directions. It emits infrared rays.
- the infrared light source 2011 includes a first set of grids arranged in a predetermined direction on a one-chip heating element and a second set of grids arranged in a direction orthogonal to the predetermined direction. With a grid.
- the shape of the first and second sets of lattices is such that the specific wavelength is ⁇ with high absorbance and ⁇ with low absorbance, taking into account the absorbance of the gas to be measured as shown in Fig. 56 (a).
- the infrared light source 2011 has a wavelength and a wavelength, respectively.
- the analysis system shown in Fig. 58 (a) further includes a chopper 211 for periodically changing the intensity of the measurement signal.
- the two types of infrared rays emitted from the infrared light source 2011 pass through the gas to be measured in the gas container 207, and the intensity changes periodically by the chiyotsuba 211.
- each of the two types of infrared rays is detected by the infrared sensor 203A or 203B after passing through the polarizing element 215A or 215B that transmits light having polarization planes orthogonal to each other.
- the measurement signal detected by the infrared sensor 203A or 203B is demodulated by the demodulator 205A or 205B and output.
- the same polarizing element can be used by changing the arrangement direction. Compared to the conventional two-wavelength analysis system that requires a two-wavelength wavelength selection element, the number of parts is reduced.
- the analysis system shown in Fig. 58 (b) further includes a power source 213 that periodically changes power to change the intensity of infrared rays emitted by the infrared light source 2011.
- the infrared light source 2011 is the infrared light source shown in FIG. 19, and is radiated by the infrared light source 2011 by changing the power supplied to the heating element of one chip by the power source 213 that periodically changes the power. Change the intensity of infrared rays.
- Two types of infrared rays radiated from the infrared light source 2011 pass through the gas to be measured in the gas container 207, and each of the two types of infrared rays transmits a light having a polarization plane orthogonal to each other. After passing through 215A or 215B, it is detected by the infrared sensor 203A or 203B.
- the measurement signal detected by the infrared sensor 203A or 203B is demodulated by the demodulator 205A or 205B and output.
- the power source 213 that periodically changes the power changes the intensity of the infrared light emitted by the infrared light source 2011, so there is no moving part and the configuration is simple.
- the energy of the heating element can be concentrated at a specific wavelength.
- the heat generation amount of the heating element can be reduced with respect to the required infrared intensity.
- the chip size can be reduced as described above.
- the heat capacity of the heating element can be reduced, the output of the power source 213 that periodically changes the power can be reduced, and the cycle of output can be shortened.
- the analysis system shown in Fig. 58 (c) is further connected between the infrared light source 2011 and the infrared sensor 203.
- a polarizing element 215 is provided.
- the polarizing element 215 may be configured to rotate around the optical axis in the plane perpendicular to the optical axis.
- the output of the demodulator 205 If it is configured to read signals, one infrared sensor 203 can be connected to both infrared and infrared.
- the analysis system shown in Fig. 58 (d) further includes a polarizing element 2153 between the infrared light source 2011 and the infrared sensor 203.
- the polarizing element 2153 includes two regions, and the polarization directions of light passing through the two regions are orthogonal to each other. The orthogonal polarization direction radiates from the infrared light source 2011
- the polarizing element 2153 is configured to reciprocate in translation on the upstream side of the infrared sensor 203.
- the infrared sensor has an infrared wavelength ⁇ .
- the translational movement like the polarizing element 2153 in FIG. 58 (d) is realized by a mechanism that does not include a sliding portion by an element such as a bimorph, the reliability of the analysis system is further improved.
- the analysis system shown in Fig. 58 (e) further includes a chopper 211 for periodically changing the intensity of the measurement signal.
- the two types of infrared rays emitted from the infrared light source 2011 pass through the gas to be measured in the gas container 207, and the intensity changes periodically by the chiyotsuba 211. Thereafter, each of the two types of infrared rays passes through the polarization separation element 2155 and is then detected by the infrared sensor 203A or 203B.
- the measurement signal detected by the infrared sensor 203A or 203B is demodulated by the demodulator 205A or 205B and output.
- the polarization separation element 2155 the above-described wire grid polarization element can be used.
- the analysis system shown in Fig. 58 (f) further includes a power source 213 that periodically changes power to change the intensity of infrared rays emitted by the infrared light source 2011.
- Infrared light source 2011 is the infrared light source shown in FIG. 19, and the power supplied to the heating element of one chip is changed by a power source 213 that periodically changes the power, so that the infrared light source 2011 The intensity of the infrared rays emitted by is changed.
- the two types of infrared rays emitted from the infrared light source 2011 pass through the measurement target gas in the gas container 207, and each of the two types of infrared rays passes through the polarization separation element 2155, and then the infrared sensor 203A. Or detected by 203B.
- the measurement signal detected by the infrared sensor 203A or 203B is demodulated by the demodulator 205A or 205B and output. Since the intensity of infrared rays is changed by the power source 213 that periodically changes the power, there is no moving part, and the configuration is simplified.
- the infrared energy emitted from the heating element is concentrated in the infrared of a specific wavelength and emitted from the infrared light source 2011.
- the intensity of the infrared light itself radiated from the infrared light source 2011 is periodically changed without using a chopper, the emitted infrared light is not cut off and discarded.
- the two types of infrared rays reach the infrared sensors 203A and 203B with little loss by the polarization separation element 2155. In this way, the analysis system shown in FIG. 58 (f) can use all the energy available in principle and is extremely energy efficient.
- the analysis system shown in FIGS. 58 (a) to 58 (f) separates infrared rays having two types of polarization planes, which are emitted from an infrared light source, by a polarizing element. For this reason, a small analysis system using two types of infrared rays can be obtained.
- the use of a polarizing element provides a noise-resistant / analytical system.
- FIG. 59 is a diagram showing a configuration of a six-wavelength five-component analysis system according to an embodiment of the present invention.
- the analysis system according to the above embodiment includes an infrared light source 2011A, 201 IB and 2011C, an infrared sensor 203A and 203B, a demodulator 205A and 205B, a gas container 207, and a power source that periodically changes power. 213A, 213B and 213C, and a polarization separation element 2155 are provided.
- Infrared light sources 2011A, 201 IB, and 2011C are, as an example, the infrared light source shown in FIG. 19, and a plurality of grids having different directions are provided on a one-chip heating element.
- the infrared light source has a polarization plane orthogonal to the arrangement direction of the respective gratings (polarization plane in the direction of A in FIG. 1), and has a specific wavelength determined by the grating shape and red polarization planes having different directions. Release external lines.
- Each of the infrared light sources 2011A, 201 IB and 2011C has a first set of grids arranged in a predetermined direction on a one-chip heating element, and a direct connection with the predetermined direction.
- the array direction of the first set of three infrared light sources is the same, and the array direction of the second set of three infrared light sources is the same.
- the first and second sets of grating shapes of infrared light sources 2011A, 201 IB, and 2011C have five specific wavelengths, taking into account the absorbance of the gas to be measured as shown in Fig. 56 (a). The characteristic wavelength and the reference wavelength of the measurement target gas are determined. Therefore, each of the infrared light sources 2011A, 201 IB, and 2011C emits two types of infrared rays each having one of the specific wavelengths and having polarization planes orthogonal to each other.
- the power supplied to the heating element of one chip is radiated by the infrared light sources 2011A, 201 IB and 201 1C by changing the power by the power supplies 213A, 213 B and 213C that periodically change the power. Change the intensity of infrared rays.
- Two types of infrared rays emitted from each of the infrared light sources 2011A, 201 IB, and 2011C pass through the measurement target gas in the gas container 207, and each of the two types of infrared rays passes through the polarization separation element 2155. After that, it is detected by the infrared sensor 203A or 203B.
- the measurement signal detected by the infrared sensor 203A or 203B is demodulated by the demodulator 205A or 205B and output.
- FIG. 60 (a) is a diagram showing an output pulse waveform of a power supply that periodically changes power.
- FIG. 60 (b) is a diagram showing output waveforms of infrared rays emitted from three infrared light sources.
- FIG. 60 (c) is a diagram showing output waveforms of two infrared sensors.
- the three infrared light sources 201 1A, 201 IB, and 2011C each emit infrared rays of two types of wavelengths with the same period and whose polarization planes are orthogonal to each other.
- the timings at which the three infrared light sources 2011A, 2011 B, and 2011C emit infrared light are shifted in time.
- each of the two infrared sensors 203A and 203B has three infrared light sources 2011A, 201 IB and 2011C each having one of two polarization planes. Detects infrared rays emitted at a time shifted timing.
- the concentration of five kinds of gases can be measured by using one of the six kinds of wavelengths as a reference signal. If no reference signal is used, the concentrations of six gases can be measured.
- the relationship between the number of infrared light sources (3 in this case) and the number of grid types (2 in this case) with each infrared light source. The concentration of a number of gases can be measured.
- the infrared rays discarded by the wavelength selection element increase, and the energy efficiency decreases.
- the energy efficiency does not decrease even if the number of gases to be measured increases.
- the infrared light source of the conventional analysis system uses a radiator coated ceramic or a ceramic plate embedded with a screen printed wiring pattern. I wouldn't do it.
- the conventional analysis system since it is impossible to reduce the size of the infrared light source, it is difficult to incorporate a plurality of infrared light sources. Moreover, since the heat capacity of the infrared light source could not be reduced, it was difficult to blink the infrared light source at high speed.
- the infrared light source used in the present invention is not only highly energy efficient, but also can be produced by semiconductor microfabrication technology, so the heat capacity of each infrared light source can be minimized. it can. It is also possible to integrate multiple independent infrared light sources on a single chip. In this way, the analysis system shown as an example in FIG. 59 can be realized.
- FIG. 55 and FIGS. 57 to 59 do not describe an optical system for infrared rays, an actual analysis system includes an optical system for infrared rays.
- FIG. 55 and FIGS. 57 to 59 show the measurement cells (such as the container 207) into which the measurement target gas flows as if they were isolated from the surrounding optical elements by the window material.
- Infrared rays are of a transmission type that passes through the measurement cell only once. However, this is only a representative configuration.
- the present invention can be applied to various configurations used in conventional analysis systems, such as a configuration in which infrared rays are reflected and propagated in a confined state.
- FIG. 65 is a diagram showing a system configuration of the sugar content meter.
- Glucometer is infrared light source 201, lens
- the infrared light source 201 is the infrared light source 100 shown in FIG. 1, and has a polarization plane orthogonal to the grid arrangement direction (polarization plane in the direction of A in FIG. 1) and is determined by the shape of the grating. It is an infrared light source that emits infrared light with a wavelength of. Alternatively, the infrared light source 201 shown in FIG. 13 or FIG. 14 may be used.
- a pyroelectric sensor that utilizes the fact that a charge is generated on the surface of the dielectric, or a thermopile that is a thermocouple array may be used.
- Infrared radiation emitted from the infrared light source 201 is collimated by the lens 221, passes through the measurement object 251 such as fruit, and is collected by the lens 223 onto the infrared sensor 203.
- a not-shown chopper may be installed after the lens 223 to periodically change the intensity of infrared rays.
- the sugar content meter measures the sugar content of the measurement object by utilizing the fact that infrared rays of a specific wavelength are absorbed according to the sugar content of the measurement object.
- the infrared of a specific wavelength is in the range of 5 to 10 micrometers, depending on the object to be measured.
- an infrared light source in which multiple specific wavelength light sources are integrated on a single chip as described with reference to FIGS. 58 and 59 may be used. .
- FIG. 66 is a diagram showing a system configuration of the moisture meter.
- Moisture meter is infrared light source 201, lens
- the infrared light source 201 is the infrared light source 100 shown in FIG. 1 and has a polarization plane (polarization plane in the direction of A in FIG. 1) perpendicular to the arrangement direction of the grating and is determined by the shape of the grating. It is an infrared light source that emits infrared light having a constant wavelength. Alternatively, the infrared light source 201 shown in FIG. 13 or FIG. 14 may be used.
- a pyroelectric sensor that utilizes the fact that a charge is generated on the surface of the dielectric, or a thermopile thermopile is used.
- Infrared light emitted from the infrared light source 201 is collimated by the lens 225 and reflected by the mirror. (1) Reflected by the object 231 to reach the object 253 and reflected by the object 253. The reflected light from the measurement object 253 is collected by the collecting mirror 233, reflected by the reflecting mirror 235, and then collected by the lens 227 on the infrared sensor 203. Further, for example, a chiyotsuba (not shown) may be installed after the lens 227 to periodically change the infrared intensity.
- the moisture meter measures the moisture of the measurement object by utilizing the fact that infrared light of a specific wavelength is absorbed according to the moisture content of the measurement object.
- the analysis system according to the present invention includes an infrared light source that is miniaturized in the form of one chip, and further, an infrared light source in which light sources of many wavelengths and light sources of many polarization planes are integrated on one chip. Can be used.
- the analysis system according to the present invention can be used to change the power supplied to the heating element of the infrared light source in a short period of time. Infrared light can be emitted from an infrared light source in a short cycle.
- a monitoring system installed outdoors uses light, a wavelength of light that is not easily affected by noise caused by reflected light from the object, or emitted light from the object.
- FIG. 72 is a diagram showing spectral components on the ground surface of sunlight.
- the horizontal axis indicates the wavelength, and the unit is micrometer.
- the vertical axis shows the spectral radiant intensity, and the unit is
- the wavelength of sunlight at sea level is less than 2.5 micrometers.
- Fig. 73 is a diagram showing the reflection characteristics and radiation characteristics of the ground surface.
- the horizontal axis indicates the wavelength, and the unit is micrometer.
- the vertical axis represents the relative values of reflection intensity and radiation intensity.
- the reflected and radiant intensities show relatively low values in the range of 2.5 micrometers to 6.0 micrometers.
- Infrared light source determined according to the method shown in Fig. 3 and Fig. 5 when the specific wavelength is 2.5 micrometer, 4.0 micrometer and 6-micrometer-meter, respectively.
- the infrared intensity ratio is shown in FIGS. 52 to 54 as described above.
- FIG. 67 is a diagram showing a configuration of a monitoring system according to an embodiment of the present invention.
- the monitoring system according to this embodiment is provided with an infrared light source 1201, lenses 1203 and 1207, a polarization filter 1205, and an infrared sensor 1209.
- the infrared light emitted from the infrared light source 1201 is collimated by the lens 1203 toward the infrared sensor 207.
- the emitted infrared light passes through the polarization filter 1205, is collected by the lens 1207, reaches the infrared sensor 1209, and is detected by the infrared sensor 1209.
- the emitted infrared light is absorbed or reflected by the monitoring object 1221 and does not reach the infrared sensor 1 209. In this way, the presence / absence of the monitoring object 1221 is monitored.
- the infrared light source 1201 the one shown in FIG. 14 or FIG. 16 that emits infrared light using a lens may be used.
- the infrared light source 1201 as shown in FIG. 13 or FIG. 15, an infrared light that is condensed by a lens and then diffused may be used.
- the specific wavelength of the infrared light source 1201 is in the range of 2.5 micrometers to 6 micrometers, it is less susceptible to the effects of sunlight noise.
- the infrared light source 1201 emits only infrared light having a predetermined polarization plane, if only the infrared light having the predetermined polarization plane is transmitted by the polarization filter 1205, the influence of noise due to sunlight or the like is reduced. Further decrease.
- FIG. 68 is a diagram showing a configuration of a monitoring system according to another embodiment of the present invention.
- the monitoring system according to the present embodiment is provided with an infrared light source 1301, a polarization beam splitter 1303, a lens 1305, a nanocup, a reflector 1307, and an infrared sensor 1309.
- the infrared light emitted from the infrared light source 1301 passes through the polarization beam splitter 1303 and is collimated toward the corner cube 'reflector 307 by the lens 1305.
- the emitted infrared light is transmitted by corner cube reflector 307.
- the lens 1305 After being reflected and collected by the lens 1305, it is reflected by the polarization beam splitter 1303, reaches the infrared sensor 1309, and is detected by the infrared sensor 1309.
- the reason why the beam is reflected by the polarization beam splitter 1303 is that the plane of polarization is changed by 90 degrees due to reflection by the corner cube reflector 1307.
- the emitted infrared light is absorbed or reflected by the monitoring object 1321 and does not reach the infrared sensor 1309. In this way, the presence / absence of the monitoring object 1321 is monitored.
- the infrared light source 1301 the one shown in FIG. 14 or 16 that emits infrared light by a lens may be used.
- a device that collects infrared light with a lens and then diffuses it may be used.
- the specific wavelength of the infrared light source 301 is in the range of 2.5 micrometers to 6 micrometers, it is less susceptible to the effects of noise from sunlight. Further, since the infrared light source 301 emits only infrared light having a predetermined polarization plane, only the infrared light having the predetermined polarization plane is transmitted by the polarization beam splitter 303 and polarized light orthogonal to the predetermined polarization plane. If only the infrared rays having a surface are reflected, the influence of noise due to sunlight will be further reduced.
- FIG. 69 is a diagram showing a configuration of a monitoring system according to another embodiment of the present invention.
- the monitoring system according to this embodiment is provided with an infrared light source 1401, parabolic reflectors 1403 and 1405, a polarization filter 1407, and an infrared sensor 1409.
- Infrared radiation emitted from the infrared light source 401 is collimated by the parabolic reflecting mirror 403 toward the parabolic reflecting mirror 405.
- the emitted infrared rays are collected by the parabolic reflector 1405, and then transmitted through the polarizing filter 1407 to reach the infrared sensor 1409. Detected by.
- the monitoring target 421 is present, the emitted infrared light is absorbed or reflected by the monitoring target 1421 and does not reach the infrared sensor 1409. In this way, the presence / absence of the monitoring object 421 is monitored.
- the infrared light source 1401 the one shown in FIG. 14 or 16 that emits infrared light by a lens may be used.
- the infrared light source 1401 the one shown in FIG. 13 or FIG. 15 that collects infrared light by a lens and then diffuses it may be used.
- the specific wavelength of the infrared light source 1401 is in the range of 2.5 micrometers to 6 micrometers, it is less susceptible to the effects of sunlight noise.
- the infrared light source 1401 emits only infrared light having a predetermined polarization plane, if only the infrared light having the predetermined polarization plane is transmitted by the polarization filter 1407, the influence of noise due to sunlight or the like is reduced. Further decrease.
- FIG. 70 is a diagram showing a configuration of a monitoring system according to another embodiment of the present invention.
- the monitoring system according to the present embodiment includes an infrared light source 1501, a lens 1503, a polarizing filter 505, an imaging lens 1507, and an arrayed infrared sensor 1509.
- Infrared light emitted from the infrared light source 1501 passes through the lens 1503 and is emitted to a predetermined monitoring target 521.
- Infrared light reflected on the monitoring object 1521 and its surroundings passes through the polarizing filter 1505 and the imaging lens 1507, reaches the infrared sensor 1509, and forms an image on the arrayed infrared sensor 1509. With this image, the monitoring object 521 and the surrounding situation can be monitored.
- the infrared light source 1501 the one shown in FIG. 14 or FIG. 16 that emits infrared rays by a lens may be used.
- the infrared light source 1501 as shown in FIG. 13 or FIG. 15, a device that collects infrared light with a lens and then diffuses it may be used.
- the specific wavelength of the infrared light source 1501 is in the range of 2.5 micrometers to 6 micrometers, it is less susceptible to the effects of sunlight noise.
- the infrared light source 501 emits only infrared light having a predetermined polarization plane, if only the infrared light having the predetermined polarization plane is transmitted by the polarization filter 1505, the influence of noise due to sunlight or the like is reduced. Further decrease.
- the lens is made of silicon, germanium, or the like.
- an infrared sensor a pyroelectric sensor that utilizes the generation of electric charges on the surface of the dielectric, a thermal infrared sensor such as a thermopile that is a thermocouple array, and a PbSe light
- a quantum infrared sensor such as a conductive element
- FIG. 71 is a diagram showing the relative sensitivity with respect to wavelength of the PbSe photoconductive element.
- the relative sensitivity of PbSe photoconductive elements peaks at wavelengths near 4 micrometers, so Suitable for infrared sensors in monitoring systems in the wavelength range (2.5 to 6 ⁇ m) to avoid noise.
- polarizing filter and the polarizing beam splitter a commercially-available via grid polarizing element may be used.
- the grating has P as the constant period, T as the width in the constant direction, and D as the grating depth of the portion functioning as the positive dielectric. , If you have a specific wavelength
- ⁇ , ⁇ , and D where ⁇ 0.5 ⁇ , ⁇ , ⁇ , and D are defined so that the peak wavelength of the infrared intensity emitted from the infrared light source matches the specific wavelength.
- the specific wavelength can be set to a desired wavelength by adjusting the period ⁇ of the grating, the width ⁇ of the grating, and the depth D of the grating.
- the grating has a certain period, and the width in the certain direction on the upper surface of the portion functioning as the positive dielectric is a grating depth.
- D is the angle of the boundary between the part functioning as the negative dielectric and the part functioning as the positive dielectric with respect to the plane of the grating, and the specific wavelength is
- the period ⁇ of the lattice, the width ⁇ of the lattice, the depth D of the lattice, and the negative By adjusting the angle ⁇ of the boundary surface between the portion functioning as a dielectric and the portion functioning as the positive dielectric with respect to the plane of the lattice, the specific wavelength can be set to a desired wavelength with the force S Monkey.
- An infrared light source according to another embodiment of the present invention is characterized in that the portion functioning as the negative dielectric is a negative dielectric material force.
- an infrared light source with few manufacturing steps and easy manufacturing can be obtained.
- An infrared light source according to another embodiment of the present invention is characterized in that only the surface of the portion functioning as the negative dielectric is made of a negative dielectric material.
- an infrared light source that is easy to manufacture and highly accurate can be obtained.
- An infrared light source is characterized in that the portion functioning as the negative dielectric comprises a plurality of types of negative dielectric material forces.
- the parameters for adjusting a specific wavelength are increased, and the design and manufacture are facilitated.
- An infrared light source is characterized in that the portion functioning as the positive dielectric is made of a plurality of types of positive dielectric materials.
- parameters for adjusting a specific wavelength are increased, and design and manufacturing are facilitated.
- An infrared light source according to another embodiment of the present invention is characterized in that the portion functioning as the negative dielectric also serves as the heating element.
- An infrared light source is characterized in that a portion of the heating element other than the portion corresponding to the lattice is covered with a metal.
- infrared rays are not emitted to portions other than the portion corresponding to the grating.
- An infrared light source includes a plurality of gratings respectively corresponding to a plurality of specific wavelengths.
- an infrared light source having a simple structure and emitting a plurality of infrared rays having specific wavelengths can be obtained.
- An infrared light source according to another embodiment of the present invention includes two or more types of gratings arranged in different directions.
- an infrared light source having a simple structure and emitting infrared rays having a specific wavelength polarized on two or more different polarization planes can be obtained.
- An infrared light source is characterized in that the shape of the grating is changed so that the specific wavelength changes along the certain direction.
- an infrared light source having a simple structure and capable of emitting infrared rays in a predetermined wavelength band can be obtained.
- An infrared light source is characterized in that the grating is arranged on a surface of a lens.
- an infrared light source that collects or diverges the emitted infrared light can be obtained.
- An infrared light source according to another embodiment of the present invention is formed as a flexible sheet.
- an infrared light source that can be widely applied to heaters and the like is obtained.
- a substrate according to the present invention includes the infrared light source according to the present invention.
- a compact substrate that emits infrared rays having a specific wavelength can be obtained.
- a substrate according to an embodiment of the present invention is characterized in that an infrared light source is provided on a thermally insulated film structure.
- an infrared light source having a small heat capacity and capable of operating at high speed can be obtained.
- a substrate according to an embodiment of the present invention includes a plurality of infrared light sources.
- a substrate capable of emitting a plurality of types of infrared rays can be obtained.
- a substrate according to an embodiment of the present invention includes a plurality of heating elements that can be controlled independently.
- a substrate capable of independently controlling the emission of a plurality of types of infrared rays can be obtained.
- the method of manufacturing an infrared light source according to the present invention has a case in which a heating element, a portion that functions as a positive dielectric, and a portion that functions as a negative dielectric are alternately formed in a fixed direction at a fixed period. And a method of manufacturing an infrared light source that radiates the radiant energy of the heat generating element while concentrating on infrared rays having a specific wavelength determined by the shape of the grating, having a polarization plane orthogonal to the arrangement direction of the grating. It is.
- the method is characterized in that a portion that functions as the negative dielectric is formed by forming the lattice mold with plastic and depositing a negative dielectric material on the surface of the mold.
- the negative dielectric material is deposited on the surface of the plastic mold, thereby forming the portion that functions as the negative dielectric. Form with precision.
- An analysis system includes the infrared light source according to the present invention and an infrared sensor capable of detecting infrared light of the specific wavelength, and the infrared light source is an object.
- the property of the object is analyzed by emitting infrared light of the specific wavelength and detecting infrared light of the specific wavelength.
- the energy of the infrared light source can be concentrated on the infrared ray of a specific wavelength, so that the energy efficiency is improved and the infrared light source and further the analysis system is downsized. be able to.
- infrared light having a specific wavelength can be emitted by an infrared light source, components such as a wavelength selection element are not required, and the structure of the analysis system is simplified.
- An analysis system includes at least one polarization element between the infrared light source and the infrared sensor, and the polarization element has a polarization plane in a predetermined direction. It is characterized by being configured to transmit or reflect only.
- the polarization element since the infrared light source emits infrared rays having a polarization plane orthogonal to the arrangement direction of the grating, the polarization element transmits or reflects only infrared rays having the polarization plane. If you do this, you will be resistant to noise!
- An analysis system has a polarization plane in the predetermined direction of the specific wavelength that is transmitted through the polarizing element or reflected by the polarizing element. It is characterized in that it is configured to change periodically.
- the infrared sensor having an intensity that changes periodically is detected by the infrared sensor, and the output of the infrared sensor is demodulated, whereby an analysis system that is resistant to noise is obtained. can get.
- An analysis system is configured to rotate the polarizing element.
- an analysis system that is resistant to noise can be obtained with a simple structure that rotates the polarizing element.
- An analysis system is characterized in that the polarizing element is configured to reciprocate.
- an analysis system that is resistant to noise can be obtained with a simple structure that reciprocates the polarizing element. If the reciprocating motion is performed by a structure that does not include a sliding part by an element such as a bimorph, the reliability of the analysis system is further improved.
- An analysis system includes a power source that supplies power to the heating element, and changes the power supplied to the heating element to change the infrared light emitted from the infrared light source. It is characterized in that the intensity is changed periodically.
- an analysis system that is resistant to noise can be obtained without including a movable part for periodically changing the intensity of infrared rays. Furthermore, since the energy efficiency of the infrared light source is high, the heat capacity of the infrared light source can be reduced, and the infrared intensity change period can be reduced.
- the infrared light source includes a heating element and a plurality of gratings, and each of the plurality of gratings includes a positive dielectric part and a grating. And a plurality of gratings having a plane of polarization perpendicular to the arrangement direction of the plurality of gratings. It is characterized by being focused on multiple infrared rays of specific wavelengths determined by the shape.
- the infrared light source emits infrared rays having a plurality of specific wavelengths
- an energy-efficient and small analysis system using infrared rays having a plurality of specific wavelengths can be obtained.
- the infrared light source includes a heating element and a plurality of gratings arranged in different directions, and each case of the plurality of gratings.
- the child is a lattice in which positive dielectric portions and negative dielectric portions are alternately formed in a constant direction at a constant period, and the radiant energy of the heating element is a plurality of polarizations orthogonal to the arrangement direction of the plurality of lattices It is characterized in that the radiation is concentrated on infrared rays having a specific wavelength determined by the shape of the plurality of gratings.
- the infrared light source emits infrared light having a plurality of polarization planes. For example, if infrared rays having different wavelengths are emitted for each of a plurality of polarization planes, it is advantageous because infrared rays having different wavelengths can be separated depending on the polarization planes.
- An analysis system includes a plurality of infrared light sources and a power source for supplying power to each of the heating elements of the plurality of infrared light sources, and each of the plurality of infrared light sources.
- the timing of supplying power to each heating element is shifted in time, and each of the plurality of infrared light sources is configured to emit infrared rays at a timing shifted in time.
- a plurality of infrared light source forces can be used to process a plurality of types of infrared rays to be processed with the time harm ij.
- the power S can be reduced by reducing the heat capacity of the infrared light source and shortening the time division cycle to improve the data processing speed.
- a monitoring system includes the infrared light source according to the present invention and an infrared sensor capable of detecting infrared light of the specific wavelength, wherein the infrared light source is the specific light source. Infrared light having a wavelength is emitted, and the infrared sensor detects the infrared light having the specific wavelength, thereby monitoring a situation around the infrared light source.
- the monitoring system according to the present embodiment is capable of using radiation with high intensity at a desired specific wavelength, and can perform monitoring with high accuracy.
- a monitoring system is characterized in that the specific wavelength is in a range of 2.5 micrometers to 6 micrometers.
- the monitoring system uses light having a wavelength in the range of 2.5 micrometer to 6.0 micrometer, sunlight, reflected light of sunlight by the object, and emitted light of the object. It is hard to be affected by noise.
- the specific wavelength may be the infrared sensor. It is characterized in that it is configured so that the sensitivity of the laser coincides with the peak wavelength.
- the monitoring system according to the present embodiment can perform monitoring with high accuracy because the specific wavelength matches the wavelength at which the sensitivity of the infrared sensor reaches a peak.
- a monitoring system is characterized in that the depth of the grating is changed along the certain direction so that the specific wavelength varies along the certain direction. To do.
- the monitoring system according to the present embodiment can use infrared rays in a desired wavelength band.
- a monitoring system is characterized in that the grating is arranged on a lens surface.
- infrared light can be collected or diverged by an infrared light source, so that a compact monitoring system can be obtained.
- a monitoring system includes at least one polarizing element in an infrared path from the infrared light source to the infrared sensor, and the polarizing element has a polarization plane in a predetermined direction. It is characterized by being configured to transmit only the light it has.
- the polarizing element since the polarizing element transmits only the infrared ray having a predetermined polarization plane emitted from the infrared light source, the influence of noise is reduced and the monitoring is reliably performed. I can do it.
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Abstract
Description
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US12/084,571 US8017923B2 (en) | 2006-05-26 | 2007-05-25 | Infrared source and method of manufacturing the same |
JP2008517912A JP4214178B2 (en) | 2006-05-26 | 2007-05-25 | Infrared light source and manufacturing method thereof |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JPPCT/JP2006/310575 | 2006-05-26 | ||
PCT/JP2006/310575 WO2007141826A1 (en) | 2006-05-26 | 2006-05-26 | Infrared light source |
JPPCT/JP2006/324023 | 2006-11-30 | ||
PCT/JP2006/324023 WO2007138726A1 (en) | 2006-05-26 | 2006-11-30 | Infrared light source |
Publications (1)
Publication Number | Publication Date |
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WO2007139022A1 true WO2007139022A1 (en) | 2007-12-06 |
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PCT/JP2007/060711 WO2007139022A1 (en) | 2006-05-26 | 2007-05-25 | Infrared light source and its fabrication method |
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WO (1) | WO2007139022A1 (en) |
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