WO1997016708A1 - Appareil pour source lumineuse et procede de mesure - Google Patents
Appareil pour source lumineuse et procede de mesure Download PDFInfo
- Publication number
- WO1997016708A1 WO1997016708A1 PCT/JP1996/003182 JP9603182W WO9716708A1 WO 1997016708 A1 WO1997016708 A1 WO 1997016708A1 JP 9603182 W JP9603182 W JP 9603182W WO 9716708 A1 WO9716708 A1 WO 9716708A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- light
- light source
- source device
- filter
- wavelength
- Prior art date
Links
- 238000000691 measurement method Methods 0.000 title claims description 4
- 238000005259 measurement Methods 0.000 claims description 60
- 230000001678 irradiating effect Effects 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 239000013078 crystal Substances 0.000 abstract description 16
- 230000003287 optical effect Effects 0.000 abstract description 15
- 238000010586 diagram Methods 0.000 description 7
- 239000000835 fiber Substances 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 230000002194 synthesizing effect Effects 0.000 description 2
- BABGMVAYPIVUMM-UHFFFAOYSA-N CC1C=NCC1 Chemical compound CC1C=NCC1 BABGMVAYPIVUMM-UHFFFAOYSA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000013256 coordination polymer Substances 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- LAJZODKXOMJMPK-UHFFFAOYSA-N tellurium dioxide Chemical compound O=[Te]=O LAJZODKXOMJMPK-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- 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
- G01J3/12—Generating the spectrum; Monochromators
- G01J3/18—Generating the spectrum; Monochromators using diffraction elements, e.g. grating
- G01J2003/1828—Generating the spectrum; Monochromators using diffraction elements, e.g. grating with order sorter or prefilter
Definitions
- Tree is a light source device that selects and separates light having the required s length from one or a number of :: ⁇ , and in particular, projects visible or near-infrared light onto the object to be measured.
- the present invention relates to a light source device used for detecting the intensity of obtained transmitted light or reflected light (including scattered light) to obtain information in a measurement object.
- the light used for the measurement is selected to have a suitable wavelength according to the object to be measured. Even for the same measurement object, the intensity of the transmitted light, reflected light, or scattered light obtained differs depending on the measurement wavelength. For this reason, a suitable wavelength must be selected according to the measurement conditions. In order to perform measurement with high sensitivity, it is necessary to accurately project light including light having the wavelength selected in this way onto the measurement object.
- a light source device combining one or more light sources that emit light of a plurality of wavelengths and a plurality of filters having different transmission wavelengths.
- a plurality of filters are provided movably by a movable part. By selecting a filter according to the wavelength used for measurement and moving it to a position to receive light from the light source, light of the wavelength used for measurement is projected toward the measurement target.
- the wavelength to be irradiated on the same object to be measured is sequentially changed, that is, when scanning of the wavelength is to be performed, it is necessary to sequentially switch the filters by mechanically moving the filter unit.
- the configuration of the entire light source device becomes complicated or large.
- the light amount is not stable due to the temperature around the light source.
- Fig. 7 shows the intensity of light irradiating the measurement object.
- S the intensity of light irradiating the measurement object.
- I the intensity of the light transmitted through the measurement object.
- the light intensity differs greatly between the incident light and the measurement light (here, the transmitted light) due to absorption by the measurement object. Therefore, in order to maximize the measurement resolution, it is necessary to change the sensitivity of the light receiving system according to the intensity of the measurement light.
- the present invention has been made in view of such circumstances, and its object is to accurately project light having a wavelength necessary for measurement onto an object to be measured, and to provide an emission intensity for each wavelength. It is an object of the present invention to provide a stable light source device having no variation in light source, and to provide a light source device which is easy to operate and can be downsized.
- the light source device of the present invention includes a light source unit that emits light of a plurality of wavelengths, a filter that selects light of one wavelength from the light of the plurality of wavelengths, and separates and emits the light of the selected wavelength. And a filter wherein the selected wavelength is electrically tunable, thereby achieving the above objective.
- the intensity of the light of the selected wavelength may be electrically variable.
- the filter may be an acousto-optic filter.
- the filter may emit the light of the selected wavelength in a different direction from the light of other wavelengths.
- the filter may emit the light of the selected wavelength as ⁇ first-order light, and emit the other light as zero-order light.
- the image forming apparatus may further include a combining unit that combines the primary light into one.
- the filter may emit the light of the selected wavelength as ⁇ m order light, and emit the other light as 0 order light, and m may be an integer of 2 or more.
- the image processing apparatus may further include a synthesizing unit that synthesizes the m-th order light into one.
- the light source unit may include a plurality of light sources.
- the light source unit may have a single light source.
- the light source device may include a light-collecting member that collects light emitted from the filter.
- the light source device may further include a member that transmits only light having the selected wavelength and blocks other light.
- the filter may be electrically adjusted such that the selected wavelength changes sequentially and that the intensity of light at the selected wavelength is constant.
- the filter may be electrically adjusted such that the intensity of the light of the selected wavelength changes sequentially and the selected wavelength is constant.
- the light source unit may include a laser diode.
- the light source unit may include a light emitting diode.
- the plurality of light sources may emit lights having different wavelength ranges.
- the plurality of light sources may be arranged in an array.
- the light source unit may further include a lens array provided between the light source unit and the filter and having a plurality of lenses.
- the measuring method includes a light source unit that emits light of a plurality of wavelengths, a filter that selects light of one wavelength from the light of the plurality of wavelengths, and separates and emits the light of the selected wavelength.
- Another measurement method of the present invention includes a light source unit that emits light of a plurality of wavelengths, a light of one wavelength selected from the light of the plurality of wavelengths, and separates and emits the light of the selected wavelength.
- a filter wherein the selected wavelength is a filter that is electrically variable, and a method and method using light emitted from a light source device S, comprising: Irradiating the measurement target with the light, receiving the light transmitted through the measurement target, or light reflected or scattered from the measurement target as measurement light, based on the received light. Performing a measurement on the object to be measured, prior to the irradiation step, so that the intensity of the measurement light becomes substantially constant without depending on a wavelength selected by the filter. And electrically adjusting the filter. It has embraced, to achieve the above object by its. Easy drawing
- FIG. 1 is a diagram showing a configuration of a filter used in the light source device of the present invention.
- FIG. 2 is a sectional view schematically showing the configuration of the light source device of the present invention.
- FIG. 3 is a diagram illustrating an example of a wavelength characteristic of a light source unit of the light source device of FIG.
- FIG. 4 is a diagram illustrating an example of wavelength characteristics of light emitted from the light source device of FIG. 2 when the light source unit has the wavelength characteristics illustrated in FIG.
- FIG. 5 is a diagram illustrating another example of the wavelength characteristics of light emitted from the light source device of FIG. 2 when the light source unit has the wavelength characteristics illustrated in FIG.
- S is a diagram showing still another example of the wavelength characteristics of light emitted from the SiSE when light is shown in FIG.
- FIG. 7 is a diagram showing an example of light emitted from a conventional light source device S and wavelength characteristics of measurement light obtained by irradiating the light on a measurement object.
- FIG. 8 is a diagram illustrating a process of adjusting the intensity of light emitted from the light source device in the optical measurement using the light source device of FIG. A form of gauga for carrying out the invention
- FIG. 1 shows a filter used for extracting light of one wavelength from light of a plurality of lengths in the light source device of the present invention.
- the filter consists of an acousto-optic filter (AOTF), which is a bandpass filter that electrically scans the wavelength.
- AOTF acousto-optic filter
- the acousto-optic filter 4 includes an acousto-optic crystal 41, an acoustic wave driver 42, a piezoelectric transducer 43, and an absorber 44, and receives incident light including components of a plurality of wavelengths, and receives one wavelength. The light containing the component and the component near the wavelength is selectively emitted.
- the acousto-optic filter 4 used in the light source device of the present invention is a so-called noncolinear type in which the traveling direction of an acoustic wave given to the acousto-optic crystal 41 and the traveling direction of light in the acousto-optic crystal 41 intersect.
- a tellurium dioxide (T e 0 2) as the acousto-optic crystal 4 1.
- the selected wavelength can be changed by changing the frequency of the high-frequency electric signal given to the piezoelectric transducer 43 by the acoustic wave driver 42. Therefore, move the filter that was required before There is no need for any mechanical moving parts, and there is no need to re-calibrate.
- the operation of the acousto-optic filter 4 will be described with reference to FIG.
- the high-frequency signal is converted into an acoustic wave by the piezoelectric transducer 43 and enters the acousto-optic crystal 41.
- the crystal lattice is distorted when passing through the optical crystal.
- the distortion of the crystal lattice acts as a grating for light having a certain wavelength among the light incident on the acousto-optic crystal 41. Therefore, the acousto-optic crystal 41 in a state where an acoustic wave is given selectively diffracts a light having a certain wavelength from the incident light and emits it as ⁇ first-order light.
- the direction in which the ⁇ first-order light is emitted depends on the frequency of the acoustic wave given to the acousto-optic crystal 41.
- the light of the remaining wavelength is emitted in a direction different from that of the ⁇ 1st-order light as the 0th-order light passing through the sound optical crystal 41. In this way, light of the wavelength selected by the filter is separated from light of other wavelengths.
- the wavelength selectively diffracted by the acousto-optic crystal 41 depends on the frequency of the acoustic wave. Therefore, if the frequency of the high-frequency signal generated by the acoustic wave driver 42 is changed, the wavelength of the light that is selectively diffracted can be changed.
- the intensity of the light emitted from the acousto-optic crystal 41 that is, the intensity of the diffracted light is determined by the power of the high-frequency signal generated by the acoustic wave driver 42. Therefore, by adjusting the power of the high-frequency signal, diffracted light having a desired intensity (light amount) can be obtained.
- the tuning optical filter 4 since the tuning optical filter 4 is used, it is possible to electrically change the wavelength and the intensity (light amount) of the light selected by the filter.
- FIG. 2 is a sectional view schematically showing the configuration of the light source device of the present invention.
- Light source device 1 includes light source unit 2, lens array 3, acousto-optic filter 4, condensing lens
- Light source unit 2 has multiple wavelength ranges It is configured to emit light.
- a light source array composed of a plurality of light sources 2A, 2B, 2C,...
- the light sources 2A, 2B, 2C,..., 2N have the same output intensity.
- the power of these light sources does not need to be turned on and off intermittently, unlike the light sources in conventional light source devices. This is because the selection of the wavelength to be separated is performed only by the electrical adjustment of the acousto-optic filter 4, so that it is not necessary to select the light source according to the wavelength to be selected unlike the conventional case.
- a laser diode, a light emitting diode, or the like can be used.
- the arrangement of the light sources may be a one-dimensional array or a two-dimensional array.
- a plurality of light sources may be arranged in a ring.
- a single light source having a broad wavelength characteristic that is, outputting light of various wavelengths, such as a fluorescent lamp, may be used. Regardless of whether multiple light sources are used or a single light source is used, the power of the light sources is turned on in advance, the power output is stable, and the amount of light emitted from each light source is stable. used.
- the lens array 3 is provided on the front surface of the light source unit 2, converts light having a plurality of wavelengths emitted from the light source unit 2 into parallel light, and then makes the light enter the acousto-optic filter 4.
- the lens array 3 has the same number of condenser lenses 3A, 3B, 3C,..., 3N as the number of light sources constituting the light source array.
- the light collimated by the lens array 3 enters the acousto-optic filter 4.
- the sound filter 4 selectively divides only the light of the desired wavelength, and converts the light of the selected wavelength into ⁇ first-order light and the light of other wavelengths as the 0th-order light. Emit in mutually different directions.
- the condenser lens 5 receives the light emitted from the sound filter 4 and condenses the 0th-order light and ⁇ 1st-order light at positions corresponding to the directions in which the light enters. Thus, only light of the selected wavelength is focused at a different location than light of other wavelengths.
- a selector 6 On the front surface of the condenser lens 5, a selector 6 having two openings is provided.
- the selector 6 is arranged such that these two openings are located at positions where the ⁇ primary lights are collected. Therefore, light other than light having a desired wavelength is blocked by the selector 6, and only the ⁇ first-order light is irradiated on the measurement object through the opening.
- a combining element 7 is arranged on the front surface of the selector 6, whereby the ⁇ primary light passing through the opening of the selector 6 is combined into one light.
- a multi-branch fiber having two input units and one output unit is used as the combining element 7.
- the combining element 7 is not limited to a multi-branch fiber, and may be any element that combines ⁇ primary lights incident from two directions and outputs the combined light as one light. For example, a light guide path or the like can be used.
- light of any wavelength can be separated from light of a plurality of wavelengths and emitted with an arbitrary intensity (light quantity) only by electrical adjustment. .
- FIG. 3 shows an example of the wavelength characteristics of the light source unit 2.
- the light source unit 2 is 10 6
- the light source unit 2 It emits light of three different wavelengths, 5 nm, 1153 nm, and 1287 nm.
- an array in which three laser diodes are arranged is used as the light source unit 2.
- the frequency of the high-frequency signal generated by the acoustic wave driver 42 is 90.665 MHz
- light having a wavelength of 1065 nm can be selected as shown in FIG. Was.
- the frequency of the high-frequency signal is 83.746 MHz
- light having a wavelength of 1155.3 nm is emitted as shown in FIG. 5 and the frequency of the high-frequency signal is 75.26 OMHz.
- FIG. 6 light having a wavelength of 1287 nm could be selected.
- the wavelength selected by the acousto-optic filter 4 can be changed by changing the frequency of the high-frequency electric signal supplied from the acoustic wave driver 42 to the transducer 43.
- the wavelength of the light emitted from the light source device is electrically controlled. Can be adjusted. Therefore, if the light source device S of the present invention is used, for example,
- optical measurement such as scanning the so-called wavelength by sequentially changing the wavelength of light irradiated on the object to be measured.
- intensity light amount
- a measurement performed by sequentially changing the wavelength of light irradiated on one measurement object can be performed as follows. First, light having an arbitrary wavelength characteristic is emitted from the light source device, and is radiated to the object to be measured. In the present embodiment, the light I having the wavelength characteristic indicated by the broken line in FIG. (S) was irradiated. Subsequently, based on the wavelength characteristics of the light obtained by this measurement, the wavelength characteristics of the irradiation light (light intensity for each wavelength) are determined so that the intensity of the measurement light is almost constant at each wavelength.
- the irradiation light I 0 ′ ( ⁇ ) having the wavelength characteristic as shown by the one-dot chain line in FIG. 8 was determined as the irradiation light that can make the intensity of the measurement light almost constant at each wavelength. .
- the wavelength of the light selected by the acousto-optic filter 4 is sequentially changed. In this way, it is possible to obtain the measurement light ⁇ ( ⁇ ) having a substantially flat wavelength characteristic.
- the wavelength for the same measurement object Not only can scanning be performed electrically easily, but also the intensity of the measurement light obtained by scanning the wavelength can be made substantially constant. Therefore, it is not necessary to change the sensitivity of the light receiving system used for measurement according to the wavelength. In addition, it is possible to set the measurement area of the light receiving system narrow. Alternatively, when electrically adjusting the intensity of light emitted from the light source device, it is also possible to adjust the power of the acoustic wave driver of the acousto-optic filter in accordance with the measurement error of the light receiving system.
- the arrangement of the light sources may be one-dimensional, two-dimensional, or annular.
- the lens array 3 is used to make the light from the light source unit 2 incident on the acousto-optic filter 4.
- a multi-branch fiber having an optical input corresponding to each of a plurality of light sources and one optical output is used instead of the lens array 3
- light can be efficiently emitted from the light source unit 2 to an acoustic source.
- the light can be focused on the optical filter 4.
- the present invention is not limited to this, and the light of the selected wavelength may be a higher-order diffracted light ( ⁇ m-order light, where m is an integer of 2 or more).
- the light source device of the present invention selects light of one wavelength from light of a plurality of wavelengths, and separates and emits it from light of other wavelengths.
- the wavelength chosen can be changed by electrically changing the filter settings. Specifically, by changing the frequency of the high frequency signal generated by the sound driver of the acousto-optic filter used as the filter, the wavelength of the light to be separated can be changed. Therefore, it is not necessary to provide a filter for each wavelength to be selected and to switch between them according to the wavelength, so that the configuration and operation of the light source device S can be simplified, The size of the entire device can be reduced. Further, light of a desired wavelength can be obtained with high accuracy.
- the light source device of the present invention not only the wavelength selected by the filter but also the intensity of light having the wavelength selected by the filter can be electrically changed. Specifically, the intensity of the light emitted from the acousto-optic filter can be changed by changing the power of the high-frequency signal generated by the acoustic wave driver of the acousto-optic filter. Further, in the light source device of the present invention, since the wavelength of the light emitted from the light source device is electrically selected by the filter, even if a plurality of light sources are provided, the light source can be selected as in the related art. There is no need to turn on / off. The light source can always be in a light emitting state.
- the light source device of the present invention it is possible to condense the light of the selected wavelength even if it is separated from the light of another wavelength.
- light of a plurality of wavelengths generated by the light source unit can be efficiently condensed on the filter. More efficient if an array of multiple light sources is used as the light source section, and a lens array arranged corresponding to the light sources or a multi-branch fiber having an optical input corresponding to the light sources is placed in front of the light source array. Thus, the light from the light source unit can be focused on the filter.
- the wavelength range of the light emitted from the light source device can be widened.
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Spectrometry And Color Measurement (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69635620T DE69635620T2 (de) | 1995-10-31 | 1996-10-30 | Lichtquelle und messmethode |
EP96935502A EP0867697B1 (en) | 1995-10-31 | 1996-10-30 | Light source apparatus and measurement method |
US09/068,028 US6404492B1 (en) | 1995-10-31 | 1996-10-30 | Light source apparatus and measurement method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP31944395A JP3654458B2 (ja) | 1995-10-31 | 1995-10-31 | 光源装置 |
JP7/319443 | 1995-10-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997016708A1 true WO1997016708A1 (fr) | 1997-05-09 |
Family
ID=18110263
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1996/003182 WO1997016708A1 (fr) | 1995-10-31 | 1996-10-30 | Appareil pour source lumineuse et procede de mesure |
Country Status (6)
Country | Link |
---|---|
US (1) | US6404492B1 (ja) |
EP (1) | EP0867697B1 (ja) |
JP (1) | JP3654458B2 (ja) |
CN (1) | CN1088835C (ja) |
DE (1) | DE69635620T2 (ja) |
WO (1) | WO1997016708A1 (ja) |
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TWI424151B (zh) * | 2010-10-08 | 2014-01-21 | Chroma Ate Inc | 組合式光源之色度測量方法與系統 |
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- 1996-10-30 WO PCT/JP1996/003182 patent/WO1997016708A1/ja active IP Right Grant
- 1996-10-30 US US09/068,028 patent/US6404492B1/en not_active Expired - Fee Related
- 1996-10-30 EP EP96935502A patent/EP0867697B1/en not_active Expired - Lifetime
- 1996-10-30 CN CN96198037A patent/CN1088835C/zh not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
DE69635620T2 (de) | 2006-08-17 |
EP0867697B1 (en) | 2005-12-21 |
EP0867697A1 (en) | 1998-09-30 |
EP0867697A4 (en) | 2000-06-28 |
JPH09126888A (ja) | 1997-05-16 |
CN1088835C (zh) | 2002-08-07 |
JP3654458B2 (ja) | 2005-06-02 |
CN1201520A (zh) | 1998-12-09 |
US6404492B1 (en) | 2002-06-11 |
DE69635620D1 (de) | 2006-01-26 |
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