WO2005001400A1 - 非破壊分光測定器 - Google Patents
非破壊分光測定器 Download PDFInfo
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- WO2005001400A1 WO2005001400A1 PCT/JP2004/008198 JP2004008198W WO2005001400A1 WO 2005001400 A1 WO2005001400 A1 WO 2005001400A1 JP 2004008198 W JP2004008198 W JP 2004008198W WO 2005001400 A1 WO2005001400 A1 WO 2005001400A1
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- Prior art keywords
- light
- light emitting
- temperature
- circumference
- rotating body
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Classifications
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- 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
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
- G01J1/20—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle
- G01J1/28—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using variation of intensity or distance of source
- G01J1/30—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using variation of intensity or distance of source using electric radiation detectors
- G01J1/32—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using variation of intensity or distance of source using electric radiation detectors adapted for automatic variation of the measured or reference value
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/02—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the intensity of light
-
- 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
- G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
- G01J3/021—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows using plane or convex mirrors, parallel phase plates, or particular reflectors
-
- 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
- G01J3/0272—Handheld
Definitions
- the present invention relates to a nondestructive spectrometer using near infrared spectroscopy, which measures discrete components such as sugar content by measuring discrete absorption spectra of fruits and the like.
- the present applicant has proposed a handy-type fruit component non-destructive measuring instrument which has been reduced in size and reduced in power consumption, thereby enabling carrying around in a field.
- This is characterized by using a plurality of light sources with a narrow half width such as LD compared to the previous method. Unlike a halogen lamp, it emits only light of the required wavelength, so it has the advantage of not wasting power.
- a spectroscopy mechanism such as a diffraction grating is not required, which is suitable for miniaturization (for example, see Patent Document 1).
- the LD has a half-value width of 2 nm or less, it is necessary to accurately detect wavelength fluctuation because wavelength fluctuation due to temperature is large.
- a part of the light branched by the bundle of optical fibers is transmitted through a filter for wavelength correction, and a change in the wavelength is detected based on a change in the amount of transmission.
- the path from the emission of LD light to the irradiation of the fruit was severely attenuated, and as a result, the resistance to disturbance light was weakened.
- Non-destructive spectrometers have been filed for the purpose of providing non-destructive spectrometers using LEDs and LDs with improved resistance to disturbance light in response to the demands of Patent Documents 2 and 3. See
- Patent Document 1 JP-A-2002-116141
- Patent Document 2 Japanese Patent Application No. 2003-008588
- FIG. 8 is a conceptual diagram illustrating the entire configuration of the nondestructive spectrometer
- FIG. 9 is a schematic cross-sectional view illustrating the configuration of an optical unit of the nondestructive spectrometer.
- the non-destructive spectrometer 1 includes an optical unit 10, an arithmetic circuit unit 20, a display device 30, a power supply unit 40, and a light shielding hood 50.
- the optical unit 10 is a unit that irradiates the measurement target 60 with light having a highly accurate wavelength and receives diffuse reflection light from the measurement target 60.
- the arithmetic circuit unit 20 stores a calibration curve which is a relational expression between the intensity of diffuse reflected light and components such as sugar content, and refers to the calibration curve using data of reflected light from the measurement target 60. In addition to calculating the sugar content and other components of the measurement target 60 and outputting them to an external device such as the display device 30 or a personal computer (not shown), it monitors the intensity of the light emitting element and controls the output intensity of the light emitting element. A circuit that monitors the temperature of the light emitting element to detect a change in the emission wavelength of the light emitting element, monitors the temperature of the object to be measured, and performs temperature correction on the calculation result. The temperature of the light emitting element and the temperature of the object to be measured can be used as parameters of the calibration curve together with the data of the reflected light. Further, the arithmetic circuit section 20 has a voltage control circuit.
- the calibration curve stored in the arithmetic circuit 20 can be rewritten from outside.
- the display device 30 is configured by using, for example, an LCD, and is a unit that displays data such as a measurement result.
- the power supply section 40 has a power supply such as a dry cell, for example, and supplies electric power to the optical unit 10, the arithmetic circuit section 20, and the display device 30.
- the power supply section 40 has a measurement switch 41.
- the light-shielding hood 50 is a light-shielding unit that allows only reflected light from the measurement target 60 to reach the light receiving element and eliminates a measurement error due to external light.
- the light-shielding hood 50 is formed of a flexible material in a bellows shape so as not to damage the measurement target when in contact with the measurement target 60 and to prevent disturbance light from entering.
- a cushioning / light shielding cushion 51 On the optical unit measurement surface side of the light shielding hood 50, a cushioning / light shielding cushion 51 that is in contact with the measurement target 60 is provided.
- the nondestructive spectrometer 1 includes a plurality of light emitting elements 15 having different emission wavelengths, and light from the light emitting element which irradiates the measurement target 60 and diffuses and reflects inside the measurement target.
- the reflected light detecting element 172 for detecting the intensity of the light, the light emitting intensity detecting element 171 for detecting the light intensity of the light emitting element, and the light emitting intensity of the light emitting means detected by the light emitting intensity detecting element are fed back to reduce the light emitting intensity.
- a light emission control unit 23 for controlling, a light emission means temperature detection element 161 for detecting the temperature of the light emission element, a measurement object temperature detection element 162 for detecting the temperature of the measurement object, an absorbance for each measurement object, and a temperature of the light emission means.
- the calibration curve (spectral data) 22 created using both the temperature of the measurement target as a parameter, the intensity of the reflected light for each wavelength diffusely reflected inside the measurement target detected by the reflected light detection element, and the temperature of the measurement target
- a component calculation unit that calculates a component to be measured; and calculates a component to be measured by referring to a calibration curve using the intensity of reflected light for each emission wavelength that has changed depending on a temperature change of the light emitting element. .
- the nondestructive spectrometer 1 includes a first light guide block 11 for fixing a plurality of light emitting elements 15, a light guide path 121 for guiding light from the light emitting elements, and a light emitting means temperature detecting element.
- a second light guide block 12 having a light guide 161; a light diffuser 18 for diffusing light from the light guide passage; and a light passage 131 for guiding the diffused light from the light diffuser and a light branched from the light in the light passage.
- a third light guide block 13 having a split light path 132, a light splitting glass plate 191 provided in the middle of the light path, and a light emission intensity detection element 171; and a reflected light detection element 172 having a light irradiation window 141.
- the optical unit 10 includes an attachment unit 14 for holding the measurement target temperature detection element 162.
- the light-emitting element 15 is a near-infrared ray that has a narrow half-width of the emission wavelength and a small wavelength variation due to temperature. Light emitting LEDs are used.
- the specific destruction spectrometer 1 having such a configuration can respond to demands for miniaturization and high accuracy by simplifying and blocking the light guiding means, and can withstand the disturbance light. Can provide a non-destructive spectrometer using LEDs and LDs with improved efficiency, but since the light from multiple light emitting elements 15 is diffused through the light diffusion means 18, the attenuation here May occur, which may be a hindrance in improving the measurement accuracy.
- an object of the present invention is to provide a nondestructive spectrometer that can irradiate an object to be measured without attenuating light from a light emitting element.
- a plurality of light emitting elements of different wavelengths arranged on a circumference toward the center of the circumference, a rotating mirror arranged at the center of the circumference, and a reflection surface of the rotating mirror are provided.
- a light-receiving element that receives light from one light-emitting element illuminated on the back side is provided, and by controlling the rotation of the rotating mirror and the light emission of the light-emitting element in synchronization, light attenuation is minimized. And improved accuracy.
- the present invention when a light source having a small variation with respect to a temperature at which the half width is narrow is used, a highly accurate calibration curve can be created, and the wavelength variation can be corrected using the temperature of the light source.
- the optical path can be simplified.
- it is possible to obtain a small-sized, non-destructive spectrometer capable of being used in a field, which is resistant to disturbance light with low power consumption and high in accuracy.
- a non-destructive spectroscopic measurement can be performed with high accuracy by using a light emitting element efficiently.
- FIG. 1 is a conceptual diagram of a nondestructive spectrometer according to an embodiment of the present invention.
- FIG. 2 is a functional configuration diagram of the nondestructive spectrometer according to the embodiment of the present invention.
- FIG. 3 is a cross-sectional view illustrating an outline of a configuration of an optical unit of the nondestructive spectrometer according to the embodiment of the present invention.
- FIG. 4 is a diagram showing an outer shape of an optical block of the optical unit.
- FIG. 5 is a diagram showing a cross-sectional shape of an optical block.
- FIG. 6 is a view showing the shape of a mounting plate.
- FIG. 7 is a view showing the shape of a rotating mirror support member.
- FIG. 8 is a conceptual diagram of a conventional nondestructive spectrometer.
- FIG. 9 is a functional configuration diagram of a conventional nondestructive spectrometer.
- FIG. 1 is a conceptual diagram illustrating the overall configuration of the nondestructive spectrometer according to the present invention.
- FIG. 2 is a functional configuration diagram illustrating the functional configuration of the nondestructive spectrometer according to the present invention. Is a schematic cross-sectional view for explaining the configuration of the optical unit of the nondestructive spectrometer according to the present invention (in the figure, the DD section shows a section along the vertical axis, and the EE section shows a section along the horizontal axis).
- FIG. 1 is a conceptual diagram illustrating the overall configuration of the nondestructive spectrometer according to the present invention.
- FIG. 2 is a functional configuration diagram illustrating the functional configuration of the nondestructive spectrometer according to the present invention. Is a schematic cross-sectional view for explaining the configuration of the optical unit of the nondestructive spectrometer according to the present invention (in the figure, the DD section shows a section along the vertical axis, and the EE section shows a
- FIG. 4 is a view showing the outer shape of an optical block constituting the optical unit according to the present invention, wherein (A) is a left side view, (B) is a front view, (C) is a right side view, and FIG. FIG. 6 is a cross-sectional view of FIG. 4, FIG. 6 is a front view of a mounting plate, and FIG. 7 is a diagram illustrating a shape of a rotating mirror support member.
- the nondestructive spectrometer 1 includes an optical unit 10, an arithmetic and control unit 20, a display device 30, a power supply unit 40, a light shielding hood 50, and a drive unit. 80.
- the optical unit 10 is a unit that irradiates the measurement target 60 with light having a highly accurate wavelength and receives diffuse reflection light from the measurement target 60.
- the arithmetic control unit 20 stores a calibration curve which is a relational expression between the intensity of diffuse reflected light and components such as sugar content, and uses a calibration curve (spectral data) using data of reflected light from the measurement target 60. Calculates the components such as the sugar content of the measurement target 60 with reference to the data, and outputs it to the display device 30 or an external device such as a personal computer (not shown).
- This circuit controls the output intensity, monitors the temperature of the light-emitting element, detects a change in the light-emitting wavelength of the light-emitting element, monitors the temperature of the measurement target, and performs temperature correction on the calculation result.
- the temperature of the light emitting element and the temperature of the object to be measured can be used as parameters of the calibration curve together with the data of the reflected light. Further, the arithmetic control unit 20 controls the voltage control circuit. Have a road.
- the calibration curve stored in the arithmetic and control unit 20 can be rewritten from outside.
- the display device 30 is configured by using, for example, an LCD, and is a means for displaying data such as measurement results.
- the power supply unit 40 has a power supply such as a dry battery, and is a unit for supplying power to the optical unit 10, the arithmetic and control unit 20, the display device 30, and the drive unit 80, and includes a measurement switch 41. ing.
- the light-shielding hood 50 is a light-shielding unit that allows only reflected light from the measurement target 60 to reach the light receiving element and eliminates a measurement error due to external light.
- the light-shielding hood 50 is formed of a flexible material in a bellows shape so as not to damage the measurement target when in contact with the measurement target 60 and to prevent disturbance light from entering.
- a cushioning / light shielding cushion 51 On the optical unit measurement surface side of the light shielding hood 50, a cushioning / light shielding cushion 51 that is in contact with the measurement target 60 is provided.
- the nondestructive spectrometer 1 has a plurality of, for example, five light emitting devices having different emission wavelengths arranged on the circumference and arranged toward the center of the circumference.
- a light emission control unit 23 that controls the light emission intensity by feeding back the light emission intensity of the light emission means detected by the light emission intensity detection element, a light emission means temperature detection element 161 that detects the temperature of the light emission element, and detects the temperature of the measurement target.
- the component operation unit 21 that calculates the component of the measurement target by referring to the calibration curve using the temperature and the temperature of the measurement target, and the light-receiving device 156 receives the diffusely reflected light from the position-detecting light-emitting device 155 to drive.
- It has a rotation control unit 24 that calculates the origin of the unit and controls the rotation of the drive unit thereafter, and refers to the calibration curve using the intensity of the reflected light for each emission wavelength that changes depending on the temperature change of the light emitting element. To calculate the component to be measured.
- the nondestructive spectrometer 1 of the present invention fixes the plurality of light emitting elements 153, and also guides the light path 131 for guiding the light from the light emitting element and the light branched from the light path.
- the optical block 13 having a branched light path 132, a light branching glass plate 191 provided in the middle of the light path, and a light emission intensity detecting element 171; a reflected light detecting element 172 having a light irradiation window 141;
- the optical unit 10 includes the mounting plate 14 that holds the detection element 162.
- the light-emitting element 153 be a near-infrared light-emitting LED having a narrow half-width of an emission wavelength and a small wavelength variation with temperature.
- the position detecting light emitting element 155 is located in the light emitting element mounting hole 137
- the position detecting light receiving element 156 is located in the light receiving element mounting hole 138
- the light emitting element temperature detecting means 161 is located at the temperature. It is attached to the detection means attachment hole 139.
- the position detecting light emitting element 155 and the position detecting light receiving element 156 are arranged close to each other in the same direction as the rotation axis of the rotating mirror unit 70.
- a rotating mirror unit 70 fixed to an output shaft of a stepping motor 81 constituting the drive unit 80.
- the rotating mirror section 70 has a cylindrical rotating mirror supporting member 73 and a mirror 71 attached to the tip of the supporting member at an angle.
- a slit 731 is provided on the long side of the rotating mirror support 73.
- the stepping motor 81 having the bearing 83 is mounted on the optical block 13 by mounting plates 85-1, 85_2.
- FIG. 4 shows an outer shape of the optical block 13, and FIG. 5 shows a cross section thereof.
- Fig. 5 (A) is a cross-sectional view taken along line A-A in Fig. 4
- Fig. 5 (B) is a cross-sectional view taken along line B-B in Fig. 4
- Fig. 5 (C) is a cross-sectional view taken along line C-C in Fig. 4. is there.
- the optical block 13 has a light emitting element mounting hole 137 in which a plurality of light emitting elements 153 and a position detecting light emitting element 155 are mounted.
- the optical unit 10 includes an optical block 13, a mounting plate 14, a position detecting light emitting element 155, a position detecting light receiving element 156, a plurality of light emitting elements 153, and a temperature detecting element 161 such as a thermistor. It comprises a branched light detecting element 171, a reflected light detecting element 172-1-172-4, a light branching glass plate 191, and a protective glass plate 192. Further, the optical unit 10 has a light irradiation window 141 on the front surface and a temperature detecting element 162 such as a thermopile.
- the optical block 13 is made of a metal having a high thermal conductivity, for example, aluminum.
- a plurality of light emitting elements 153 having different emission wavelengths are fixed, and have a plurality of light emitting element fixing holes 137.
- a light emitting element 153 and a position detecting light emitting element 155 having, for example, an LED and having different emission wavelengths are inserted and fixed.
- a heat conductive material such as silicon grease is interposed between the peripheral wall of the light emitting element fixing hole 137 and the light emitting element 153 to enhance heat conduction between the two.
- a rotating mirror unit 70 is inserted into the light path 131 of the optical block 13, and guides light from each light emitting element 153 except the position detecting light emitting element 155 to the light branching glass plate 191. .
- the optical block 13 has a light path 131, a light branch path 132, a glass plate holding groove 134, and a light detection element holding hole 135.
- the light path 131 is a path for guiding the light emitted from the light emitting element to the object to be measured, and an optical branch path 132 for branching a part of the light is provided on the way.
- the optical branch path 132 is a path that guides light obtained by branching a part of the light from the light emitting element to the branched light detection element 171, and is provided so as to intersect the optical axis of the optical path 131 at right angles, and has one end. Open to the light path 131 and the other end opens to the photodetector holding hole 135.
- the glass plate holding groove 134 is provided in the optical path 131 so as to intersect the optical axis at 45 degrees, and holds the light branching glass plate 191.
- the light detection element holding hole 135 holds the branch light detection element 171 via an insulating material.
- the mounting plate 14 shown in FIG. 6 is made of, for example, a PEEK material which is an insulating synthetic resin, and has a light irradiation window 141 and a light holding the reflected light detecting elements 172-11-1172-4.
- a temperature detection element holding hole 144 for holding the output element 162 is provided, and a protective glass plate 192 is fixed to the light irradiation window 141.
- the light irradiation window 141 attached to the attachment plate 14, the reflected light detection element 172, the measurement target temperature detection element 162, and the measurement target detection light emitting element 151 are arranged facing the measurement target.
- the light emitting element 153 constituting the light source is an element for irradiating the measurement target with light having a small half-value width and high accuracy, and has a different light emission wavelength in this embodiment acting as a light emitting means.
- the LED 153 is arranged at an angle at which the mirror 71 of the rotating mirror unit 70 provided in the optical block 13 is irradiated with the LED light.
- the LED 153 is, for example, a laser diode having a peak wavelength of light emission of 810, 845, 872, 904, and 915 nm, and a narrow laser diode with a half-width force S4 nm or less. Further, in this light emitting diode, it is desirable that the wavelength change due to temperature is 0.2111117 or less.
- the light-emitting element 151 for measuring object detection is configured using an LED that emits visible light, and allows the light-emitting element 153 to emit light only when the object to be measured is in contact with the light-shielding hood 50, thereby allowing the user to perform measurement. It has the function of ensuring safety.
- the light emitting element temperature detecting element 161 is configured using, for example, a thermistor, and is an element that measures the temperature of the light source. Used to correct errors caused by wavelength changes.
- the measurement target temperature detecting element 162 is configured using, for example, a thermopile, and is an element that detects radiant heat from the measurement target to detect the temperature of the measurement target.
- the temperature data is taken into the arithmetic circuit as a parameter, and is used to correct the error resulting from the temperature change of the measurement result of the operation result.
- the branch light detection element 171 is configured using, for example, a photodiode, functions as a light emission intensity detection unit, receives the branch light from the light branching glass plate 191 and obtains data regarding the output intensity of the light source. And has a function of controlling the output of the light emitting element 153.
- the reflected light detection element 172 is configured using, for example, a photodiode, functions as a reflected light detection means, and receives light diffusely reflected inside the measurement target.
- the glass plate 191 for light branching functions as a light branching means, is installed at an angle of 45 degrees in the middle of the light guide passage 131, and reflects and branches a part (about 8%) of light from the LED.
- the light enters the branch term detection element 171 via an opening provided in the side wall of the light path 131.
- the measurement target 60 is, for example, a fruit such as an apple, a pear, a tomato, and the like, and a component such as a sugar content thereof can be measured. It is also possible to measure the fat content of fish meat such as bonito and tuna in a nondestructive manner. In addition, blood components such as sugar content and cholesterol can be measured from outside the skin without collecting blood from humans or the like.
- the structure of the rotating mirror support member 73 of the rotating mirror unit 70 will be described with reference to FIG. 7, (A) is a front view, (B) is a bottom view, (C) is a rear view, (D) is a right side view, and (E) is a left side view.
- the rotating mirror support member 73 is formed in a shape in which a tip of a cylinder having a through hole 734 at the center is beveled and cut at 45 degrees.
- a mirror support surface 732 for fixing and supporting the mirror 71 is formed on a slope formed at the tip, and mirror support claws 733 are formed on both upper and lower ends of the mirror support surface 732.
- the rotating mirror support member 73 has a slit 731 on the back side of the mirror support surface 732.
- the left-hand force in the drawing and the rotating shaft 82 of the stepping motor are inserted into the through hole 734, and the rotating mirror support member 73 is fixed by three screws inserted into the screw holes 735.
- the rotating mirror support member 73 having this configuration is inserted into the optical path 131 of the optical block 13, and is disposed at a position where the mirror 71 reflects light from the light emitting element 153.
- the light from the position detecting light emitting element 155 is introduced into the slit 731 force through hole 734, is reflected on the back surface 72 of the mirror 71, is irregularly reflected on the inner surface of the through hole 734, passes through the slit 731 and receives the position detecting light receiving element. Reach 1 56.
- the origin of the rotating mirror (mirror) 71 can be determined.
- the position of the rotating mirror 71 can be known based on this, and when the surface of the rotating mirror 71 faces one of the light emitting elements 153, the light emitting element 153 emits light. The light reflected by the mirror 71 is radiated to the measurement target 60.
- the non-destructive spectrometer 1 can be held with one hand, and the fruit is lightly applied to the light-shielding hood 50 of the contact part with the other hand, and the measuring switch 41 provided on the grip part is pressed. Is calculated and displayed on the display device 30.
- the measurement switch 41 When the measurement switch 41 is pressed, the power is turned on, and the arranged LEDs 153 sequentially emit light. The emitted light enters the light guide passage 131, is reflected by the mirror 71, and is emitted from the irradiation window 141 to the fruit 60.
- a certain percentage (8%) of the incident light of the LED is always reflected by the light splitting glass plate 191 arranged in the middle of the light path 131, and is detected by the split light detecting element 171.
- the intensity of the light received by the branch light detection element 171 is fed back and measured from the light path 131.
- the current of the LED 153 is controlled so that the intensity of the light applied to the target 60 becomes a constant value.
- the light applied to the fruit to be measured repeats diffuse reflection inside the fruit, and a part of the light is detected by the reflected light detection element 172. However, of the light radiated from the light irradiation window 141 to the fruit, the light directly reflected from the fruit surface is blocked by the protective cushion 51 and is not detected by the reflected light detection element 172.
- the intensity of the light detected by the reflected light detection element 172 is obtained by using a relational expression prepared in advance together with the actual temperature data obtained by the temperature detection element 162 and the temperature data of the LED obtained by the temperature detection element 161. And the sugar content is calculated. After the calculated sugar content is displayed on the display device 30 for a certain period of time, the power is turned off and the operation is completed.
- the reflected light intensity detection data of the reflected light detection element 172, the LED temperature data obtained by the temperature detection element 161, and the measurement target temperature detection element 162 are obtained.
- a relational expression for calculating the sugar content from the temperature data of the fruit will be described.
- the nondestructive spectrometer according to the present invention nondestructively measures the sugar content of a fruit. The method is to irradiate the fruit with near-infrared rays in the short wavelength region where the transmission power is relatively strong, obtain the absorbance from the amount of transmitted light, and correct the absorbance based on the temperature of the fruit. To obtain an index related to sweetness.
- the absorbance of the fruit at the five wavelengths ( ⁇ 1- ⁇ 5) obtained by the reflected light detection element 172 is represented by L (l), L (2), L (3), L (4), Let L (5) be the temperature data of the fruit obtained by the temperature detecting element 162, and T2 the temperature data of the LED obtained by the temperature detecting element 161.
- the sugar content C of the fruit is expressed by the following equation (1). Is done.
- K0, Kl, K2,..., K7 indicate proportional constants.
- the absorbance L ( ⁇ ) is a force that slightly changes due to a change in the temperature of the fruit or a change in the measured wavelength ( ⁇ n) due to the change in the LED temperature.
- the optimum value of Kn is determined by the method described below. In this case, the correction can be made by the last two terms on the right side of the above equation (2).
- T1 obtained by the temperature detecting element 162 and T2 obtained by the temperature detecting element 161 are used as parameters reflecting the temperature of the sample and the temperature of the LED.
- the temperature sensor 162 to be measured and the temperature sensor 161 of the light-emitting element should not be used. Is also possible.
- the peak wavelength power of each of the emission wavelengths is 810, 845, 872, 904, and 915 nm, and the half width power is as narrow as S4 nm or less.
- An example was described in which a light-emitting diode with a wavelength variation of 0.2 nm / ° C or less was used for light-emitting diodes. Even with three LEDs with peak values of 810, 872, and 904 nm, sufficiently high accuracy and measurement results can be obtained.
- the light emission intensity of the light emitting element is controlled by monitoring the temperature of the light emitting element.
- one light emitting unit including five light emitting elements 153, one position detecting light emitting element 155 and one rotating mirror unit 70, and one reflected light
- the nondestructive spectrometer of the present invention may be constituted by the detection element 172.
- five light emitting elements 153, one position detecting light emitting element 155, and one position detecting light emitting element 155 are provided around one reflected light detecting element 172. It is also possible to increase the intensity of the irradiation light and increase the measurement accuracy by arranging four light-emitting units composed of the rotating mirror unit 70. In this case, the positions of the light irradiation window 141 of the mounting plate 14 and the light detection element holding hole 142 may be interchanged.
- the light from the plurality of light emitting elements 153 is reflected by the mirror 71 and irradiates the object 60 to be measured, the light emitted from the light emitting elements is more efficient than the prior art using the diffusion plate. It can be used well and can measure with high accuracy.
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Abstract
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JP2003185167A JP3620798B2 (ja) | 2003-06-27 | 2003-06-27 | 非破壊分光測定器 |
JP2003-185167 | 2003-06-27 |
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WO2005001400A1 true WO2005001400A1 (ja) | 2005-01-06 |
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PCT/JP2004/008198 WO2005001400A1 (ja) | 2003-06-27 | 2004-06-11 | 非破壊分光測定器 |
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WO (1) | WO2005001400A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN111222455A (zh) * | 2020-01-03 | 2020-06-02 | 深圳数联天下智能科技有限公司 | 波长的选择方法、装置、计算设备及计算机存储介质 |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2008175794A (ja) * | 2007-01-17 | 2008-07-31 | Tohoku Univ | 反射測定装置および方法 |
DE102011116367A1 (de) * | 2011-10-19 | 2013-04-25 | Bluepoint Medical Gmbh & Co. Kg | Vorrichtung zur hoch aufgelösten Bestimmung der Konzentration von Substanzen in fluiden Medien |
JP6213759B2 (ja) * | 2012-09-21 | 2017-10-18 | パナソニックIpマネジメント株式会社 | 分析装置 |
KR20150114465A (ko) * | 2012-12-07 | 2015-10-12 | 에스 뻬 트루와 아쉬 | 열기관에서 유체를 분석하기 위한 온보드 디바이스 및 방법 |
JP6257148B2 (ja) * | 2013-02-20 | 2018-01-10 | キヤノン株式会社 | 画像形成装置 |
KR101493838B1 (ko) | 2013-11-26 | 2015-02-17 | 포항공과대학교 산학협력단 | 광발광 측정 및 이미징 장치 |
JP6311915B2 (ja) * | 2013-12-18 | 2018-04-18 | パナソニックIpマネジメント株式会社 | カロリー測定装置 |
JP6450444B2 (ja) * | 2017-12-05 | 2019-01-09 | キヤノン株式会社 | 測定装置、および画像形成装置 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01131151U (ja) * | 1988-02-29 | 1989-09-06 | ||
JPH07148169A (ja) * | 1993-11-30 | 1995-06-13 | Technol Res Assoc Of Medical & Welfare Apparatus | 光走査装置 |
JPH07333144A (ja) * | 1994-06-07 | 1995-12-22 | Iseki & Co Ltd | 近赤外分光分析装置 |
JPH085548A (ja) * | 1994-06-22 | 1996-01-12 | Technol Res Assoc Of Medical & Welfare Apparatus | 光走査装置 |
-
2003
- 2003-06-27 JP JP2003185167A patent/JP3620798B2/ja not_active Expired - Fee Related
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2004
- 2004-06-11 WO PCT/JP2004/008198 patent/WO2005001400A1/ja active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01131151U (ja) * | 1988-02-29 | 1989-09-06 | ||
JPH07148169A (ja) * | 1993-11-30 | 1995-06-13 | Technol Res Assoc Of Medical & Welfare Apparatus | 光走査装置 |
JPH07333144A (ja) * | 1994-06-07 | 1995-12-22 | Iseki & Co Ltd | 近赤外分光分析装置 |
JPH085548A (ja) * | 1994-06-22 | 1996-01-12 | Technol Res Assoc Of Medical & Welfare Apparatus | 光走査装置 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111222455A (zh) * | 2020-01-03 | 2020-06-02 | 深圳数联天下智能科技有限公司 | 波长的选择方法、装置、计算设备及计算机存储介质 |
CN111222455B (zh) * | 2020-01-03 | 2022-04-01 | 深圳数联天下智能科技有限公司 | 波长的选择方法、装置、计算设备及计算机存储介质 |
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JP3620798B2 (ja) | 2005-02-16 |
JP2005017210A (ja) | 2005-01-20 |
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