WO2023286632A1 - 識別装置 - Google Patents
識別装置 Download PDFInfo
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- WO2023286632A1 WO2023286632A1 PCT/JP2022/026354 JP2022026354W WO2023286632A1 WO 2023286632 A1 WO2023286632 A1 WO 2023286632A1 JP 2022026354 W JP2022026354 W JP 2022026354W WO 2023286632 A1 WO2023286632 A1 WO 2023286632A1
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- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
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- 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
- G01N21/314—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths
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Definitions
- the present invention relates to an identification device that identifies specimens.
- An identification device acquires an image obtained by spectrally dispersing Raman scattered light from a specimen with an imaging device.
- Japanese Patent Application Laid-Open No. 2008-209128 discloses a laser light source for irradiating a specimen with primary light, a spectroscopic element that disperses Raman scattered light from the specimen, and a spectroscopic spectrum projected from the spectroscopic element as a spectral image.
- An identification device is disclosed that includes an imaging device that captures an image.
- the identification device disclosed in Japanese Patent Application Laid-Open No. 2008-209128 evaluates the degree of similarity based on the dichroic ratio of the Raman shift peak intensity specific to the target substance on the corrected spectral spectrum of the known standard sample and the sample. is disclosed to estimate
- an identification device equipped with a technique for relieving identification performance that deteriorates due to changes in the detected spectral spectrum due to wavelength fluctuations of the primary light from the light source.
- the identification device described in Japanese Patent Application Laid-Open No. 2011-214917 has correction means for correcting the wave number shift of the spectral spectrum based on the wavelength information of the primary light obtained using the reflected light component contained in the secondary light from the specimen. disclosed.
- the wavenumber shift corresponding to the interaction between the spectroscopic wavelength from the spectroscopic element and the specimen is nonlinear. It is non-linear with respect to element address as shown in 3A.
- FIG. 3A shows that the observation range of the wavenumber shift axis was 700 to 3800 cm ⁇ 1 when the excitation wavelength of a blue semiconductor laser with an excitation wavelength of 478 nm was changed by 5 nm to the long wavelength side. This shows an example of a change on the wave number side. Wavelength fluctuation may be referred to as wavelength shift, wavelength change, or wavelength drift.
- the identification device described in JP-A-2011-214917 estimates the variation of the excitation wavelength of the light source based on the secondary light of the specimen, so the contamination of the specimen, the secondary light from the conveyor belt, In some cases, there was concern that sample mixing would limit the accuracy of estimating the excitation wavelength.
- the excitation light wavelength estimation technology to the identification device for resource recovery such as waste materials
- the sample size, cleaning degree, and mixing ratio with other materials are more important than when applying it to shipping inspection of industrial products. Because of the large variability, they were more susceptible to such limitations in estimation accuracy. If the correction of the wave number shift is insufficient due to the wavelength fluctuation of the primary light, it is conceivable that the operation rate of the identification device will decrease because the identification performance cannot be maintained. Since the waste identification cost has a positive correlation with the reciprocal of the operation rate of the identification device, there has been a demand for an identification device that does not lower the operation rate even when the wavelength of the primary light fluctuates.
- an object of the present invention is to provide an identification device that can accurately acquire a spectral spectrum without lowering the operating rate even if the wavelength of the excitation light from the light source fluctuates.
- An identification device includes a placement section for placing a sample on the placement section, and an optically coupled light source for irradiating the sample placed on the placement section with primary light.
- an illumination unit for collecting secondary light from the specimen; a spectroscopic unit for spectroscopically collecting the secondary light collected by the spectroscopic unit; an imaging unit for acquiring; and an identification device for identifying properties of the specimen based on the spectral image, wherein the correcting unit corrects information regarding the wavenumber shift corresponding to the spectral image based on wavelength information regarding the wavelength of the primary light.
- FIG. 1 is a diagram showing a schematic configuration of an identification device according to a first embodiment
- FIG. 3 is a diagram showing a schematic configuration of a spectral information acquisition unit according to the first embodiment
- FIG. It is a figure which shows the projection of the optical spectrum to an imaging part.
- FIG. 10 is a diagram showing changes in projection position of the spectral observation area with respect to changes in the wavelength of primary light
- FIG. 2 is a diagram showing the effect of excitation wavelength variation on wavelength shift according to the background art
- FIG. 5 is a diagram showing the effect of wavelength shift correction according to the first embodiment
- FIG. 11 is a diagram showing a schematic configuration of an identification device according to a third embodiment;
- FIG. 11 is an XZ plane view of two plane views showing a schematic configuration of an identification device according to a fourth embodiment; It is an XY plane view among dihedral views showing a schematic configuration of an identification device according to a fourth embodiment.
- FIG. 12 is a diagram showing a schematic configuration of an identification device according to a fifth embodiment; FIG. It is a figure which shows the correlation of an excitation wavelength and light source temperature.
- the identification device 1000 includes an irradiation unit 22 that irradiates a condensed irradiation light 220 toward the specimen 900i transported in the transport direction dc.
- the specimen 900i is supplied to the transport section 200 by the feeder 500 and transported by the transport section 200 along the transport direction dc.
- the irradiation light 220 may be called convergent light 220 or primary light 220 .
- the identification device 1000 includes a transport unit 200 having a conveyor belt that transports the specimen 900i in the x direction at a transport speed vc, and a discrimination device 300 downstream of the transport unit 200 in the transport direction dc. have.
- a spectral information acquisition unit having a spectral element and an imaging unit will be described using FIG. 2A.
- the identification device 1000 has a spectral information acquisition unit 100 that acquires spectral information of light collected from the specimen 900i.
- the spectral information acquisition unit 100 obtains the Raman shift corresponding to the wave number difference between the Raman scattered light contained in the secondary light from the specimen 900i and the excitation light contained in the primary light, and the intensity of the spectral component corresponding to the Raman shift. , is the unit that gets the .
- wavenumber shift may be referred to as Raman shift or wavenumber difference.
- the spectral information acquisition unit 100 includes an irradiation unit 22 that irradiates the specimen 900i with irradiation light 220, and a lighting unit 20 that collects secondary light from the specimen 900i.
- the irradiation unit 22 and the lighting unit 20 of this embodiment are arranged coaxially, and the irradiation unit 22 is optically coupled to a light source 25 including a laser light source via an optical fiber 130 .
- the light collection unit 20 is optically coupled to the spectral image acquisition unit 10 so that the spectral information acquisition unit 100 can acquire optical information reflecting the material contained in the specimen 900i.
- FIG. 2A is a diagram schematically showing an example of the configuration of the spectral information acquisition section 100.
- the spectral information acquisition section 100 includes a lighting unit 27 having an irradiation section 22 that irradiates light onto the specimen 900i and a lighting section 20 that collects Raman scattered light from the specimen 900i.
- the irradiation unit 22 and the lighting unit 20 are arranged coaxially on the specimen side (object side) when viewed from the dichroic mirror 250, and even if there is a height difference or inclination on the irradiation surface of the specimen 900i, the center of the irradiation spot and the Positional deviation from the center of the luminous flux of the scattered light to be collected is less likely to occur.
- the irradiation unit 22 is arranged above the transport unit 200 with a predetermined distance WD from the transport surface 200S of the conveyor belt.
- the irradiation unit 22 is arranged so as to focus the irradiation light 220 toward the upper surface of the specimen 900i, thereby increasing the scattering intensity of the Raman scattered light, which is weaker than the Rayleigh scattered light by several orders of magnitude.
- a unit including the irradiation section 22 and the light source 25 may be referred to as an irradiation optical system.
- the irradiation unit 22 includes an objective lens 260, a dichroic mirror 250, a collimating lens 230, a cylindrical lens, and a reflecting mirror 210, as shown in FIG. 2A.
- a convex lens, a collimating lens, a concave lens, a zoom lens, or the like is adopted as the objective lens 260 .
- Synthetic quartz can be used as a glass material for the collimator lens 230, the cylindrical lens 240, the objective lens 260, and the like. These lenses are irradiated with high-output light from the semiconductor laser 25 and pass through them. By using lenses made of synthetic quartz as a glass material, background components including fluorescence and Raman scattered light derived from the glass material can be reduced. can be done.
- the objective lens 260 acts as a condensing lens that converges the light from the laser light source 25 onto the specimen 900i in the irradiating section 22 .
- the objective lens 260 forms a focal plane 65, a focus (focal spot) with a focal diameter ⁇ (not shown), and a depth of focus ⁇ DF at a position separated from the objective lens 260 by a focal length DF corresponding to the numerical aperture NA.
- the collimator lens 230 and the cylindrical lens 240 reduce the spread of the light emitted from the laser light source 25 and shape it into parallel light.
- Cylindrical lens 240 may utilize other collimating optics such as an anamorphic prism pair.
- the irradiation unit 22 may have a wavelength filter such as a laser line filter arranged at the position of the pupil plane. This makes it possible to improve the wavelength characteristics of the light with which the specimen 900i is irradiated by the irradiation unit 22 .
- At least part of the irradiation unit 22 can be shared with the lighting unit 20, as shown in FIG. 2A. Since the lighting unit 20 and the irradiation unit 22 of this embodiment are arranged coaxially, the objective lens 260 and the dichroic mirror 250 are shared by the lighting unit 20 and the irradiation unit 22 .
- the light source 25 is a light source for irradiating the mounting section 200 or the specimen 900 i mounted on the mounting section 200 with excitation light via the optical fiber 130 and the irradiation section 22 .
- the light source 25 is optically coupled to the irradiation section 22 via the optical fiber 130 .
- the identification device 1000 for spectrally dispersing Raman scattered light the light source 25 uses a laser light source with a wavelength of 400 to 1100 nm. In Raman scattering, the shorter the wavelength, the higher the excitation efficiency, and the longer the wavelength, the lower the background fluorescent component.
- the excitation wavelength of the laser light source applied to the light source 25 is preferably selected such that the Raman shift difference between the target and non-target materials of interest is clearly obtained, but at least 532, 633, 780 and 1064 nm. You may use either.
- the semiconductor laser 25 is used as the light source of the irradiation unit 22
- the present invention is not limited to this, and other laser light sources such as semiconductor pumped solid-state lasers and gas lasers can also be used.
- the light source 25 of this embodiment has an output unit that outputs wavelength information of the pumping light so that it can be read by another device.
- the light collection unit 20 is arranged above the transport surface 200S so that the secondary light from the upper surface of the specimen 900i transported by the transport unit 200 can be collected.
- the light collection unit 20 is arranged above the transport unit 200 corresponding to the irradiation area so that the secondary light from the upper surface of the specimen 900i passing through the irradiation area of the irradiation unit 22 can be collected. In other words.
- the lighting section 20 includes an objective lens 260 , a dichroic mirror 250 , an imaging lens 270 and an optical fiber 190 .
- the objective lens 260 of the lighting unit 20 includes a convex lens, a collimating lens, a concave lens, a zoom lens, etc., like the irradiation unit 22 .
- the light collection unit 20 may include a wavelength filter such as a band-pass filter or a long-pass filter that reduces the excitation light component contained in the primary light in order to reduce unnecessary light in the spectroscopic measurement.
- the lighting unit 20 employs an objective lens with a large numerical aperture to ensure lighting efficiency, and an objective lens with a small numerical aperture to ensure working distance and depth of focus.
- a numerical aperture of 0.1 or more and 0.5 or less is adopted for the objective lens of the lighting unit 20 . More specifically, B-270 manufactured by SCHOTT with an effective lens diameter of 25 mm, a focal length of 20 mm, and a numerical aperture of 0.5 can be used as the objective lens.
- the spectral image acquisition unit 10 includes, in order from the lighting unit 20 side, a branching unit 195, an imaging lens 110, a bandpass filter 120, a spectroscopic unit 150, and an imaging unit 170. .
- Each of the spectroscopic units 150 separates the light collected by the light collecting unit 20 via the imaging lens 160, and projects a continuous spectrum onto the imaging unit 170 along the row direction or the column direction of the light receiving element array of the imaging unit 170. are arranged to
- the spectral spectrum 280s is projected onto the imaging section 170 along the light receiving elements 350 arranged in the row direction 172r.
- FIG. 2B is a diagram showing projection of the spectral spectrum 280s onto the imaging unit 170. As shown in FIG.
- the spectroscopic unit 150 may appropriately optimize the grating period and the center wavelength according to the projected wavenumber band in order to project the spectral image onto the effective imaging area on the imaging unit 170 with high utilization efficiency.
- the imaging unit 170 is arranged at an optimum position in consideration of the output angle from the spectroscopic unit 150, the diffraction efficiency of the spectroscopic unit 150, the wave number resolution, and the like.
- the imaging unit 170 employs an imaging device such as a CCD or CMOS in which light receiving elements are arranged two-dimensionally.
- the plurality of light receiving elements 350 of the imaging unit 170 of this embodiment are arranged in a matrix. It is associated with the direction of one of the three axes and the synthesized direction obtained by synthesizing the remaining two axes.
- the identification device 1000 identifies the properties of the specimen 900i while transporting the specimen 900i by the transport unit 200, and discriminates the specimen 900i by the discrimination device 300, which will be described later, according to the identification result.
- FIG. The spectral spectrum 280s projected onto the imaging unit 170 is due to Raman scattered light generated from the specimen 900i moving on the transport surface 200S.
- a spectrum 280 s is projected onto the imaging unit 170 while the transported specimen 900 i is present in the irradiation area of the irradiation light 220 (converged light 220 ) from the irradiation unit 22 .
- the imaging unit 170 detects a spectral image formed by Raman scattered light generated from the sample 900i.
- the possible time is 5 milliseconds or less. Therefore, the imaging unit 170 is required to have a high frame rate.
- a CMOS image sensor can be cited as such a high frame rate imaging unit, and therefore a CMOS image sensor is preferable as the imaging unit 170 .
- the imaging unit 170 has high sensitivity in the wavenumber region for acquiring the spectrum image corresponding to the spectrum 280s.
- a rolling shutter image sensor has a simpler pixel structure, a higher aperture ratio, and a larger photoelectric conversion element than a global shutter image sensor, so that sensitivity and dynamic range can be increased.
- the rolling shutter type image sensor has the advantage of being lower in cost than the global shutter type image sensor. For these reasons, a rolling shutter CMOS image sensor is used as the imaging unit 170 in this embodiment.
- the imaging unit 170 can employ a rolling reset type image sensor that sequentially resets each row in which the light receiving elements 350 are arranged. Thereby, the exposure time of each row in which the light receiving elements 350 are arranged can be lengthened as much as possible, and the sensitivity can be enhanced.
- the imaging unit 170 has a crop readout function of performing a readout operation on a specific row in the light receiving unit 171 in which the light receiving elements 350 are arranged two-dimensionally in the row direction 172r and the column direction 172c.
- the morphological information acquisition unit 70 detects that the sample 900i reaches the light-receivable area of the light-receiving unit 20, a specific row in the light-receiving unit 171 corresponding to the light-receiving unit 20 is read out.
- the imaging unit 170 includes a readout circuit 173, a horizontal scanning circuit 174, a vertical scanning circuit 175, and an output circuit 176. Signals from a plurality of pixels arranged in a matrix are read row by row. Read out sequentially.
- the vertical scanning circuit 175 selects and drives an arbitrary row in the light receiving section 171 .
- the readout circuit 173 reads the signals output from the pixels in the row selected by the vertical scanning circuit 175 and transfers them to the output circuit 176 under the control of the horizontal scanning circuit 174 . As a result, reading in the main scanning direction (row direction) is performed. Also, the row selected by the vertical scanning circuit 175 is shifted, and the reading circuit 173 performs reading in the main scanning direction according to the control of the horizontal scanning circuit 174 .
- signals can be read out from the entire light receiving section 171 .
- the read signal is output as an output signal to the correction section 290 located outside the imaging section 170 via the output terminal 177 of the output circuit 176 .
- scanning in the main scanning direction is performed at high speed, but scanning in the sub-scanning direction is slower than scanning in the main scanning direction.
- the imaging lens 110 converts the branched light beams transmitted through either the optical fiber 190 from the lighting unit 20 or the optical fiber 190 from the branching unit 195 into parallel beams.
- the optical fiber 190 may be rephrased as a branched light guide section 190 in some cases.
- the bandpass filter 120 attenuates the excitation light component contained in the collected light and allows part of the Raman scattering light component to pass through.
- the bandpass filter 120 has spectral transmission characteristics that attenuate Raman scattered light on the high wavenumber side and the low wavenumber side, respectively.
- the spectroscopic unit 150 disperses the collected light and disperses the wavelength components in a fan shape.
- the imaging lens 160 projects the light split by the spectroscopic section 150 onto the imaging section 170 .
- the spectroscopic section 150 is a transmissive diffraction grating.
- a reflective diffraction grating can also be used as the diffraction grating, and in that case, the configuration of the spectroscopic element adopts the Rowland arrangement or the Zernii-Turner system.
- the spectroscopic section 150 may be called a diffraction grating 150 .
- the imaging unit 170 acquires the spectral information Si of the sample 900i in consideration of the captured spectral image, the photoelectric conversion characteristics of the imaging device of the imaging unit 170, the transmission characteristics of the optical system, and the like.
- spectroscopic section 150 may acquire polarization information including circular dichroism and optical rotatory dispersion together with the spectral spectrum.
- the spectral information acquisition unit 100 includes a material information reference unit 180 that acquires material information of the specimen 900i based on the spectral information Si acquired by the spectral image acquisition unit 10 and corrected for wavenumber shift by a correction unit 290 described later.
- the material information reference unit 180 refers to a material database (not shown) containing Raman scattered light reference data, and based on the degree of similarity between the spectral information Si and the reference data, the material contained in the specimen 900i is identified. Acquire the material information Mi.
- the spectral information acquisition unit 100 stores at least one of the spectral information Si and the material information Mi in the first storage unit 60 via the command unit 40, which will be described later.
- the material database referenced by the material information reference unit 180 may be stored in the local server provided in the identification device 1000, or may be a remote server accessible via the Internet or intranet.
- the spectral information acquisition unit 100 can acquire material information Mi such as the mixture of materials, additives, and impurity components contained in the sample 900i.
- the morphological information acquisition unit 70 includes a camera 76 arranged so that an imaging field of view 700 overlaps with the transport unit 200, and an image processing unit 78 that processes the specimen image captured by the camera 76.
- the morphological information Fi of the sample 900i is acquired.
- the morphological information Fi is, like the material information Mi, information about the properties of the specimen 900i.
- the image processing unit 78 performs image processing including contrast and outline extraction, and acquires the length in the transport direction, the reflected color, the shape, the degree of mixture of materials, etc. for each specimen 900i.
- the image processing unit 78 may be said to be an element that performs processing for acquiring information regarding the size of each specimen 900i.
- the morphological information acquisition unit 70 can include a photo interrupter and a laser interferometer (not shown) instead of the camera 76 .
- the morphological information acquisition section 70 may be rephrased as an imaging section. Also, the morphological information acquisition unit 70 is an element that is selectively employed in the identification device 1000 .
- the acquisition unit 30 acquires identification information Di indicating whether each sample 900i is a target sample or a non-target sample.
- the acquisition unit 30 outputs the acquired identification information Di to the command unit 40 .
- the acquisition unit 30 acquires the material information Mi acquired by the material information reference unit 180, the spectral information Si whose wavenumber shift has been corrected by the correction unit 290, and the morphological information acquired by the morphological information acquisition unit 70.
- Acquire identification information Di based on at least one of Fi.
- the acquisition unit 30 identifies the properties of the specimen 900i based on the Raman spectrum contained in the secondary light collected by the light collection unit 20. In other words, the acquisition unit 30 of the present embodiment identifies the properties of each sample 900i based on the sample image acquired from the camera 76 and the Raman spectrum contained in the secondary light collected by the light collection unit 20. .
- the spectral information acquisition unit 100 and the morphological information acquisition unit 70 in the present embodiment may be replaced with a hyperspectral camera or a multiband camera capable of acquiring the morphological information Fi and the spectral information Si from the captured image. It is possible to In other words, it can be said that the identification device (not shown) according to the modified form includes a detection system that acquires multidimensional data capable of reading material information and morphological information.
- the identification device 1000 includes a control unit 400 including a command unit 40 that controls the discrimination operation of the discrimination device 300 based on the properties of each specimen 900i, a display unit 140 that provides a GUI that allows the user to specify control conditions. there is
- the control unit 400 further includes a first storage section 60 that stores properties of each sample 900i, and a second storage section 80 that stores control conditions for the discrimination operation.
- the command unit 40 includes a display control unit (not shown) that displays on the display unit 140 the spectrum image 280ic of the specimen 900i in which the wave number shift is corrected and acquired by the acquisition unit 30 .
- the display control unit (40) may display information on the correction amount of the wave number shift on the display unit 140.
- the identification device 1000 of this embodiment has a first storage unit 60, a second storage unit 80, and a third storage unit 90 that can store and recall data related to the identification operation, the discrimination operation, and the acquisition of spectral information. are doing.
- the first through third storage units may be integrated with each other, separated, or provided on a remote server so as to be remotely accessible.
- the first storage unit 60 associates and stores identification information Di, material information Mi, spectral information Si, morphological information Fi, and time tp at which the specimen 900i passes through the irradiation area 220 for each specimen 900i. is configured to Time tp may be rephrased as timing tp.
- the second storage unit 80 is configured to store control conditions for controlling the intensity Is of the discrimination operation of the discriminator 300 corresponding to the identification information Di for each sample 900i.
- Control conditions include forms such as referable tables, algebraically expressed general formulas, and machine-learned statistical information.
- the command unit 40 determines the passing time of the processing region where the sample 900i passes through the region subjected to discrimination processing by the discriminating device 300, according to the identification information Di from the acquisition unit 30, and according to the material and size of each sample 900i. It estimates and generates commands that control the discriminating operation of the discriminator 300 .
- the passage time of the sample 900i through the processing region is estimated based on at least one of a signal from the morphological information acquisition unit 70, a signal from the spectral information acquisition unit 100, and a signal from a sample sensor (not shown) provided in the transport unit 200. It is possible to
- the discrimination device 300 includes an air nozzle 330 for discharging compressed air at a predetermined discharge time, discharge speed, and discharge flow rate, and a discrimination control unit 350 for controlling a solenoid valve (not shown) provided in the air nozzle 330. and have Discrimination control section 350 receives a control signal from command section 40 of identification device 100 .
- the discriminating operation of the discriminating device 300 of this embodiment includes the operation of discharging fluid. Fluids for ejection include air, dry nitrogen, inert gases such as rare gases, liquids, gas-liquid mixed fluids (aerosols), and the like.
- the discrimination device 300 collects the sample 900i into the target collection basket 620 and the non-target collection basket 600 or 640 according to the properties of the sample 900i based on the control signal commanded by the command unit 40 .
- the ejection device that ejects the fluid can be replaced with a flap gate that opens and closes at a predetermined angular speed, a shutter that opens and closes at a predetermined speed, or the like.
- the morphological information acquisition unit 70, the spectral information acquisition unit 100, the discrimination device 300, and their components constituting the identification device 1000 are arranged in parallel at different positions in the transport width direction of the transport unit 200, and the system Consolidation and high-speed processing can be achieved.
- the discriminating device 300 may be regarded as an element of the discriminating device 1000 and may be rephrased as a discriminating section 300 .
- the transport section 200 constitutes, together with the feeder 500, a transport unit that transports the sample 900i.
- the transport unit 200 of the present embodiment has a conveyor belt that transports the sample 900i supplied from the feeder 500 in the transport direction dc at a speed vc, and transports the sample 900i linearly on the transport surface 200S.
- the transport unit 200 includes a turntable feeder that spirally transports the sample outward, a vibrating feeder that is provided with a vibration exciter that moves the sample in a predetermined direction, a conveyor roller that is composed of a plurality of rollers, and the like. can be replaced.
- the transport unit 200 moves the sample 900i so that the sample 900i passes through the imaging field 700 of the camera 76, it may be rephrased as the placement unit 200 for the morphological information acquisition unit 70.
- the transport section 200 moves the specimen 900i so that the specimen 900i passes through the effective lighting area 22R of the lighting section 20, it may be rephrased as the mounting section 200 for the lighting section 20.
- the conveying speed vc of the conveying unit 200 can be 0.1 to 5 m/s in the case of a conveyor belt.
- a vibrating conveyor, a vibrating sieve machine, a crushing and granulating machine, and the like are used as means for pretreatment.
- wavelength information acquisition unit 295A that acquires wavelength information of primary light referred to by the correction unit 290, which will be described later, will be described with reference to FIGS. 1 and 2A.
- the wavelength information acquisition unit 290 is an element that acquires the wavelength information of the excitation light.
- the wavelength information acquisition unit 295A of the present embodiment acquires wavelength information of the primary light 220 using the wavelength information of the excitation light output from the light source 25, and outputs the information to the correction unit 290 described later.
- the correction unit 290 corrects information regarding the wavenumber shift corresponding to the spectrum image captured by the imaging unit 170 based on wavelength information regarding the wavelength of the primary light from the irradiation unit 22 .
- the correction unit 290 in the identification device 1000 corrects the wave number shift (Raman shift) of the spectrum image 280i corresponding to the specimen 900i based on the wavelength information wi of the primary light.
- the wave number shift of the spectral image 280i is corrected.
- An excitation wavelength ⁇ 10 at a predetermined operating point that serves as a reference for the light source 25, a wavenumber shift ⁇ k corresponding to a predetermined molecular bond that is likely to be contained in the specimen, and a Raman shift obtained from a predetermined molecular bond at a predetermined operating point is ⁇ 20. Then, the following general formula (1) is established.
- the operating point of the light source 25 includes operating temperature, drive frequency, and the like.
- the excitation wavelength ⁇ 10 at a given operating point may be paraphrased as the wavelength ⁇ 10 that does not fluctuate, the excitation wavelength ⁇ 0 of the light source.
- the change rate q of the secondary light is generally It is uniquely described using (p, ⁇ 10, ⁇ k) in Equation (3).
- x is a mathematical symbol representing a product.
- FIG. 2C is a diagram showing changes in the projected position of the spectral observation area with respect to changes in the wavelength of the primary light.
- ⁇ kmin, ⁇ kmax are the lower and upper limits of the wavenumber shift (Raman shift) corresponding to the range of the spectral spectrum for identification evaluation, the wavelength of the primary light is ⁇ 1, and the wavelength of the secondary light ⁇ 2 corresponding to the Raman shift ⁇ k generated in the specimen 900i is ⁇ 2.
- the following general formula (4) holds.
- the wavelength ⁇ 2 of the secondary light described by general formula (4) is shown on the lower right side of FIG. 2C.
- the wavelength ⁇ 2 decreases in a minor order with respect to the wave number shift ⁇ k, and increases in a minor order with respect to the wavelength ⁇ 1 of the primary light.
- the wavelength ⁇ 2 of the secondary light is uniquely defined and described by one function with respect to the wave number shift ⁇ k and the wavelength ⁇ 1 of the primary light.
- the curve represented by the general formula (4) shifts in a large direction along the wave number shift ⁇ k axis.
- ⁇ max and ⁇ min which are the upper and lower limits of the wavelength of the secondary light corresponding to ⁇ kmin and ⁇ kmax, are the lower and upper limit wavenumber shifts, which are the observation regions of the wavenumber shift (Raman shift), as shown in FIG. 2C. Shift to the wavelength side.
- the spectral component 150 diffracts the spectral component at the spectral angle ⁇ in accordance with the spectral sensitivity characteristic of the diffraction grating 150, and projects such that the imaging unit 170 can acquire the spectral image 280i. do.
- the spectral angle ⁇ of the spectroscopic section 150 is described by the following general formula (5).
- the dependence of the spectral angle ⁇ from the spectroscopic section 150 represented by the general formula (5) on the wavelength ⁇ 2 of the secondary light exhibits a monotonically increasing curve as shown in the upper right of the graph in FIG. 2C.
- the spectral angle ⁇ is uniquely described with respect to the wavelength ⁇ 2 of the secondary light.
- a variation is also employed in which the spectral angle ⁇ from the spectroscopic section 150 is set to be minor-decreasing with respect to the wavelength ⁇ 2 of the secondary light.
- the spectral angle and the wavelength ⁇ 2 of the secondary light do not have a maximum value or a minimum value in the wavenumber shift band of the observation area, and monotonously increase or monotonically decrease.
- EN is the element number in the row direction of the imaging device of the imaging unit 170
- D is the distance from the incident point of the diffraction grating of the spectroscopic unit 150 to the imaging unit 170
- the spectral component corresponding to the wave number shift ⁇ k is received.
- the element number EN of the element to be used is represented by the general formula (6).
- the distance D is the distance of a vertical line hanging from the incident point of the diffraction grating to the light receiving surface of the image sensor
- the parameters a and b are values uniquely determined by the optical arrangement on projection. Parameters D, a, and b are values that can be uniquely acquired as initial values by the correction unit 290 of the identification device 1000 .
- the element address EN of the imaging unit represented by the general formula (6) presents a monotonically increasing curve with respect to the spectral angle ⁇ , as can be seen in the upper left of the graph in FIG. 2C. It is uniquely described with respect to ⁇ ( ⁇ 2).
- the wavelength ⁇ 1 of the primary light corresponding to the excitation wavelength of the light source 25 and the element address EN( ⁇ k, ⁇ 1) on the imaging unit 170 on which the spectrum component of the Raman shift with respect to the wavenumber shift ⁇ k of interest is projected is expressed by the general formula ( 1) to (6) are represented by general formula (7).
- r is a correction value (r) by which the wave number shift value ⁇ k assigned to the output signal from the light receiving element of the imaging unit 170 is multiplied when the wavelength shift of the primary light occurs.
- 290 corresponds to the correction amount (r) given to the information on the wave number shift ⁇ k.
- the parameter r may be rephrased as a correction amount (r), a correction value (r), a rate of change (r) with respect to the wave number shift value ⁇ k, and a rate of change (r) with respect to the wave number shift value ⁇ k.
- the fluctuation rate r of the wave number shift value which is the basis of the correction amount, is uniquely defined by the following general formula (11), depending on the parameters ( ⁇ k, ⁇ 1, p) that can be obtained by the identification device 1000. described explicitly.
- ⁇ 10 is a predetermined value determined as a standard operating condition of the light source 25 and a value already acquired by the correction unit 290 .
- ⁇ k is a wavenumber shift of interest in the spectral image 280 i and is a value that the correction unit 290 can acquire in advance for each element address EN of the imaging unit 170 .
- the wavenumber shift assigned to the signal output from the light receiving element of the imaging unit 170 when the excitation wavelength of the light source 25 varies p is calculated by the correction unit 290 by multiplying by (r) based on the general formula (11). It is multiplied and corrected so as to be r ⁇ k. That is, the correction unit 290 can correct the information on the wavenumber shift corresponding to the spectral image 280i to be ⁇ k ⁇ r based on the wavelength information p and ⁇ 1 on the wavelength of the primary light. That is, consider the operation of the correction unit 290 when the wavelength ⁇ 1 of the primary light is changed by p times. At this time, the correction unit 290 performs correction so that the wavenumber shift ⁇ k corresponding to the signal output from the light receiving element 350 included in the imaging unit 170 changes by (1+(1 ⁇ 1/p)/( ⁇ k ⁇ 1)) times. conduct.
- the Raman shift band to be identified when the Raman shift band to be identified is fixed, the wavelength ⁇ 2 of the secondary light is shifted to a longer wavelength in a state in which the primary light corresponding to the variation rate p is larger than 1 is shifted to a longer wavelength, and the projection position of the spectral spectrum
- General formula (11) explains that is shifted to the low wave number side (long wavelength side).
- the correction coefficient r for the wave number shift ⁇ k is generally greater than 1 in the state where the primary light corresponding to the variation rate p is greater than 1 is shifted to the long wavelength. Equation (11) is explained.
- the wavelength ⁇ 2 of the secondary light is shifted to a short wavelength in a state where the primary light corresponding to the fluctuation rate p of less than 1 is shifted to a short wavelength
- the projection of the spectral spectrum General formula (11) explains that the position shifts to the high wave number side (short wavelength side).
- the correction coefficient r for the wave number shift ⁇ k is generally less than 1 in a state where the primary light corresponding to the fluctuation rate p of less than 1 is shifted to a shorter wavelength. Equation (11) is explained.
- the correction coefficient r is 1 when the primary light corresponding to the variation rate p of 1 maintains the reference wavelength.
- the correction unit 290 acquires a correction value r for correcting the wave number shift ⁇ k based on the change rate p of the primary light, the reference wavelength ⁇ 1 of the primary light, and the wave number shift ⁇ k of interest. to correct the spectral information Si from .
- the change rate p of the primary light and the reference wavelength ⁇ 1 of the primary light are included in the wavelength information wi acquired by the wavelength information acquisition unit 295 .
- a display control unit (40) (not shown) included in the command unit 40 shown in FIG.
- the wavenumber shift of the spectral information Si is corrected over the observation range of the spectral wavelength of the primary light by the correction unit 290 . Therefore, the identification device 1000 according to this embodiment can accurately acquire a spectral spectrum without lowering the operating rate even when the wavelength of the excitation light from the light source fluctuates.
- the identification device 2000 includes a branching unit BS (beam splitter) that branches the excitation light from the light source 25, a wavelength information acquisition unit 295B that acquires wavelength information of the primary light based on the branched light branched from the branching unit BS, is different from the first embodiment.
- the branching part BS is arranged on the optical path between the light source 25 and the irradiation part 22 .
- the identification device 2000 differs from the first embodiment in that it has a third storage unit 90 that associates and stores the spectroscopic information Si before wavenumber shift correction and the specimen number i of the specimen 900i. do.
- the wavelength information acquisition unit 295B includes a spectrometer capable of reading the wavelength information of the branched light from the branching unit BS.
- the wavelength information acquisition unit 295B outputs the acquired wavelength information wi of the primary light to the third storage unit 90 .
- the third storage unit 90 receives and stores the output of the spectral information Si before wavenumber shift correction from the imaging unit 170 and the wavelength information wi of the primary light from the wavelength information acquisition unit 295B. Information stored in the third storage unit 90 can be read from the correction unit 290 .
- the third storage unit 90 stores wavelength information wi used by the correction unit 290 described later or information corresponding to the wavelength information wi in association with the time tp or the sample 900i.
- Information corresponding to the wavelength information wi includes the temperature of the excitation section of the light source 25, the driving frequency, the duty ratio, and the like.
- the third storage unit 90 stores the time tp, a unique serial number such as the specimen number of the specimen 900i, the spectroscopic information Si before wavenumber shift correction, and the wavenumber information wi in association with each other.
- a neutral density filter (not shown) may be placed between the wavenumber information acquisition unit 295B and the branching unit BS.
- the correction unit 290 corrects the wavenumber shift of the spectral information Si over the observation range of the spectral wavelength of the primary light. Therefore, the identification device 2000 according to this embodiment can accurately acquire a spectral spectrum without lowering the operation rate even when the wavelength of the excitation light from the light source fluctuates.
- the identification device 3000 differs from the first embodiment and the second embodiment in that it has a wavelength information acquisition unit 295C that acquires wavelength information of the primary light based on the Rayleigh scattering component contained in the secondary light from the specimen 900i. is different from the embodiment of The branching part BS is arranged on the optical path between the light source 25 and the irradiation part 22 .
- the identification device 3000 includes a spectral image acquisition unit 10A including an imaging unit (not shown) so as to capture an image of a Rayleigh scattered component that is dispersed on the higher wavenumber side than the Raman scattered light component by the spectroscopic unit 150 shown. 1 and the second embodiment.
- the identification devices 1000, 2000, 3000, etc. described in the specification of the present application are configured to disperse the Stokes light component that is shifted to the lower wavenumber side than the excitation light (primary light), and generate Raman scattered light based on the Stokes light. Configured to acquire spectra.
- the Rayleigh scattered light is a component elastically scattered from the primary light without interaction with the specimen, and serves as a basis for identifying the wavelength information of the primary light.
- the correction unit 290 corrects the wave number shift of the spectral information Si over the observation range of the spectral wavelength of the primary light. Therefore, the identification device 3000 according to this embodiment can accurately acquire a spectral spectrum without lowering the operation rate even when the wavelength of the excitation light from the light source fluctuates.
- an identification device 4000 differs from each of the identification devices 1000, 2000, and 3000 in that it has a wavelength information acquisition section 295D that acquires the wavelength information based on the secondary light from the standard specimen RM.
- the identification device 4000 is provided with a track TR0 on which a tubular standard sample RM is provided so that the receiver 200 moves parallel to the track TR1 on which the sample 900i is transported. It differs from the identification devices 1000, 2000, and 3000.
- the standard sample RM one in which a unimodal Raman shift peak is recognized within a predetermined wavenumber shift range is adopted.
- a wavenumber shift range a wavenumber shift range of 100 cm ⁇ 1 or more is adopted. Since the Raman shift peak exhibits a unimodal shape, its full width at half maximum FWHM is preferably 50 cm ⁇ 1 or less. Full width at half maximum may be rephrased as half width.
- the standard sample RM is preferably a substance with a simple molecular structure rather than a complicated one, with few subcomponents and high purity.
- a material that is stable against ultraviolet rays, chemicals, temperature, and wet atmosphere is selected according to the installation environment of the identification device.
- the standard specimen RM organic compounds containing resins such as polystyrene, polyethylene, polyimide, etc., carbon allotropes such as graphite, etc. are adopted.
- the standard specimen RM is milky white and opaque to the primary light, because the intensity of the Raman scattered light can be easily obtained from the incident surface and inside of the standard specimen RM.
- Rayleigh scattered light may be used instead of Raman scattered light as the secondary light from the standard specimen RM.
- the fourth embodiment modified to use Rayleigh scattered light from the standard specimen RM can be rephrased as a modification of the identification device 3000 of the third embodiment.
- the standard sample RM adopts a modified form in which the standard sample RM is provided on the transport track TR1 for transporting the sample 900i without preparing a dedicated track for the standard sample RM.
- a modified form includes a form in which it is installed on a belt conveyor that serves as a background for the light spot from the specimen 900i.
- the form in which the track TR dedicated to the standard specimen RM of the present embodiment is provided has the following advantages: Advantageous over variants.
- the form in which the track TR dedicated to the reference specimen RM of the present embodiment is provided can be rephrased as the form in which the standard specimen RM is provided at a position on the mounting section that does not overlap with the mounted specimen 900i.
- the identification device 4000 makes the focal length DF of the track TR0 longer than the track TR1 on which the sample is placed, according to the height of the standard sample RM from the mounting surface 200S. That is, the focal plane 65-0 of the primary light 220-0 corresponding to the track TR0 is adjusted lower than the focal plane 65-1 of the primary light 220-1 corresponding to the track TR1.
- the identification device 4000 includes a cleaning unit 401 that cleans the partial region CR of the track TR0 for the purpose of maintaining the cleanliness of the standard sample RM.
- the cleaning unit 401 employs dry cleaning such as a UV lamp or UV-ozone asher.
- the cleaning of the cleaning unit 401 may be performed continuously in cooperation with the operation of the identification device 4000, may be performed intermittently based on the passage of the transported specimen 900i, or may be performed intermittently based on the passage of the transported specimen 900i. It may operate adaptively according to the degree of contamination of 900i.
- the intermittent or adaptive cleaning operation reduces deterioration due to sputtering, etching, etc., or reduction in film thickness due to excessive cleaning of the standard sample RM provided on the track TR0.
- the intermittent or adaptive cleaning operation of the cleaning unit 401 can be performed based on information from the morphological information acquisition unit 70-0 provided so as to overlap the imaging field of view 700-0 on the track TR0 in the same manner as the track TR1. It is possible
- the cleaning unit 401 can be replaced with other methods such as an air nozzle that injects compressed air, a brush with conductive hair, or a combination of multiple methods.
- the correction unit 290 corrects the wavenumber shift of the spectral information Si over the observation range of the spectral wavelength of the primary light. Therefore, the identification device 4000 according to this embodiment can accurately acquire a spectral spectrum without lowering the operation rate even when the wavelength of the excitation light from the light source fluctuates.
- the identification device 5000 differs from each of the identification devices 1000, 2000, 3000, and 4000 in that it has a wavelength information acquisition section 295E that acquires wavelength information of the primary light based on information about the driving state of the light source 25.
- FIG. The wavelength information acquisition unit 295 ⁇ /b>E acquires the temperature of the metal housing of the CAN-type semiconductor laser (not shown) included in the light source 25 as the temperature of the light source 25 .
- a metal housing also serves as a radiator for such a semiconductor laser.
- the wavelength information acquisition unit 295E outputs the wavelength information wi of the primary light to the correction unit 290 based on the acquired light source temperature and the dependence of the excitation wavelength on the light source temperature shown in FIG. 7B.
- the information about the driving state of the light source 25 includes at least one of the temperature of the housing of the light source 25, the temperature of the oscillator of the light source 25, the power consumption of the light source 25, the heat dissipation of the light source 25, and the like.
- the correction unit 290 corrects the wavenumber shift of the spectral information Si over the observation range of the spectral wavelength of the primary light. Therefore, the identification device 5000 according to this embodiment can accurately acquire a spectral spectrum without lowering the operating rate even when the wavelength of the excitation light from the light source fluctuates.
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Abstract
Description
識別装置1000は、図1に示すように、搬送方向dcに搬送される検体900iに向けて、集光するように照射光220を照射する照射部22を備える。検体900iは、フィーダ500により搬送部200に供給され、搬送部200により搬送方向dcに沿って搬送される。照射光220は、集束光220、一次光220と換言される場合がある。
識別装置1000は、検体900iから採光した光の分光情報を取得する分光情報取得部100を有している。分光情報取得部100は、検体900iからの二次光に含まれるラマン散乱光と一次光に含まれる励起光との波数差に対応するラマンシフトと、かかるラマンシフトに対応する分光成分の強度と、を取得するユニットである。本願明細書において、波数シフトは、ラマンシフト、波数差と換言される場合がある。
図2Aは、分光情報取得部100の構成の一例を模式的に示す図である。分光情報取得部100は、検体900iに光を照射する照射部22と、検体900iからのラマン散乱光を採光する採光部20と、を有する採光ユニット27を備えている。照射部22と採光部20とは、ダイクロイックミラー250から見て検体側(対物側)において同軸配置をとっており、検体900iの照射面に高低差や傾きがあっても、照射スポットの中心と採光する散乱光の光束の中心との間で位置ずれが生じ難くなっている。
照射部22は、図1に示すように、コンベアベルトの搬送面200Sから所定距離WDを隔てて搬送部200の上方に配置されている。
光源25は、光ファイバ130と照射部22とを介して、載置部200または載置部200に載置された検体900iに励起光を照射するための光源である。光源25は、光ファイバ130を介して照射部22に光学的に結合していると換言される。ラマン散乱光を分光するための識別装置1000において、光源25は、波長400~1100nmの波長のレーザ光源が利用される。ラマン散乱は波長が短いほど励起効率が上がり、波長が長いほどバックグラウンドとなる蛍光成分が低減する。
採光部20は、搬送部200により搬送される検体900iの上側の面からの二次光を採光できるように、搬送面200Sの上方に配置される。採光部20は、照射部22からの照射光220の照射領域を通過する検体900iの上方の面からの二次光を採光できるように照射領域に対応する搬送部200の上方に配置されると換言される。
分光画像取得部10は、図2Aに示すように、採光部20の側から順に、分岐部195、結像レンズ110、バンドバスフィルタ120、分光部150、および、撮像部170、を備えている。分光部150は、それぞれ、結像レンズ160を介して、採光部20が採光した光を分光し、撮像部170の受光素子配列の行方向または列方向に沿って連続スペクトルを撮像部170に投影するように配置される。
撮像部170は、二次元に受光素子が配列されたCCD、CMOS等の撮像デバイスが採用される。本実施形態の撮像部170の複数の受光素子350はマトリクス状に配置されているが、デルタ配列等の場合は、行方向、列方向を、3軸のうちの2軸の方向に対応付けるか、3軸のうちの1軸の方向と残る2軸を合成した合成方向とに対応付けられる。
分光情報取得部100は、分光画像取得部10が取得し後述する補正部290により波数シフトが補正された分光情報Siに基づき、検体900iの材料情報を取得する材料情報参照部180を有している。材料情報参照部180は、ラマン散乱光のリファレンスデータが収録されている不図示の材料データベースを参照し、分光情報Siと参照データとの類似度に基づいて、検体900iに含まれる材料が識別された材料情報Miを取得する。分光情報取得部100は、後述する指令部40を介して、第1の記憶部60に分光情報Siおよび材料情報Miの少なくともいずれか一方を記憶する。
形態情報取得部70は、図1に示すように、撮影視野700を搬送部200に重ねるように配置されたカメラ76と、カメラ76が撮影した検体像を画像処理する画像処理部78と、を備え、検体900iの形態情報Fiを取得する。形態情報Fiは、材料情報Miと同様に、検体900iの性状に関する情報となる。
取得部30は、検体900i毎にターゲット検体か非ターゲット検体かの識別情報Diを取得する。取得部30は、取得した識別情報Diを指令部40に出力する。取得部30は、図1、図2Aのように、材料情報参照部180が取得した材料情報Mi、補正部290により波数シフトが補正された分光情報Si、形態情報取得部70が取得した形態情報Fi、の少なくともいずれかに基づいて識別情報Diを取得する。
識別装置1000は、検体900i毎の性状に基づき弁別装置300の弁別動作を制御する指令部40と、制御条件をユーザーが指定可能なGUIを提供する表示部140と、含む制御ユニット400を備えている。制御ユニット400は、さらに、検体900i毎の性状を記憶する第1の記憶部60、弁別動作の制御条件を記憶する第2の記憶部80と、を備えている。指令部40は、取得部30が取得した波数シフトが補正された検体900iのスペクトル像280icを表示部140に表示する不図示の表示制御部を備えている。表示制御部(40)は、波数シフトの補正量に関する情報を表示部140に表示する場合がある。
本実施形態の識別装置1000は、識別動作、弁別動作、分光情報の取得に関するデータを記憶、呼び出し可能な第1の記憶部60、第2の記憶部80、第3の記憶部90、を有している。第1~第3の記憶部は、互いに統合されても、分割されても、リモートでアクセス可能なようにリモートサーバ上に設けられても良い。
指令部40は、取得部30からの識別情報Diに応じて、検体900i毎の材料、大きさに応じて、検体900iが弁別装置300により弁別処理される領域を通過する処理領域の通過時刻を推定し、弁別装置300の弁別動作を制御する指令を生成する。検体900iの処理領域の通過時刻は、形態情報取得部70からの信号、分光情報取得部100からの信号、搬送部200に設けた不図示の検体センサからの信号、の少なくともいずれかに基づき推定することが可能である。
弁別装置300は、図1に示すように、所定の吐出時間、吐出速度、吐出流量で圧縮空気を吐出するためのエアノズル330と、エアノズル330が備える不図示のソレノイドバルブを制御する弁別制御部350と、を有する。弁別制御部350が、識別装置100の指令部40からの制御信号を受けつける。本実施形態の弁別装置300の弁別動作は、流体を吐出する動作を含む。吐出動作の流体は、空気、乾燥窒素、希ガス等の不活性ガス、液体、気液混合流体(エアロゾル)等が含まれる。弁別装置300は、指令部40から指令される制御信号に基づき、検体900iの性状に応じて、検体900iをターゲット回収かご620と非ターゲット回収かご600、または、640に回収する。
搬送部200は、フィーダ500から順次、供給される複数の検体900i(i=1、2、・・・)を所定の搬送速度vcで搬送方向dc(図1ではx方向)に搬送する搬送ユニットである。搬送部200は、フィーダ500とともに、検体900iを搬送する搬送ユニットを構成する。
次に、後述する補正部290が参照する一次光の波長情報を取得する波長情報取得部295Aについて、図1、図2Aを用いて説明する。波長情報取得部290は、励起光の波長情報を取得する要素であると換言される。
次に、本実施形態の識別装置1000の特徴に係る補正部290について、図1、図2A、図2B、図2C、図3Bを用いて説明する。補正部290は、照射部22からの一次光の波長に関する波長情報に基づいて、撮像部170が撮像したスペクトル像に対応する波数シフトに関する情報を補正する。識別装置1000における補正部290は、一次光の波長情報wiに基づいて、検体900iに対応するスペクトル像280iの波数シフト(ラマンシフト)を補正する。補正部290は、図1、図2Aのように、波長情報取得部295Aが取得した一次光の波長情報wiと、分光画像取得部10が備える撮像部170が取得した分光スペクトル280sと、に基づいて、スペクトル像280iの波数シフトを補正すると換言される。
次に、図4を用いて、第2の実施形態に係る識別装置2000について説明する。識別装置2000は、光源25からの励起光を分岐する分岐部BS(ビームスプリッタ)と、分岐部BSから分岐された分岐光に基づいて一次光の波長情報を取得する波長情報取得部295Bと、を有する点において第1の実施形態と相違する。分岐部BSは、光源25と照射部22との間の光路上に配置される。また、識別装置2000は、波数シフトを補正する前の分光情報Siと検体900iの検体番号iとを関連付けて記憶する第3の記憶部90を有している点において第1の実施形態と相違する。
次に、図5を用いて、第3の実施形態に係る識別装置3000について説明する。識別装置3000は、検体900iからの二次光に含まれるレイリー散乱成分に基づいて一次光の波長情報を取得する波長情報取得部295Cと、を有する点において第1の実施形態、及び、第2の実施形態と相違する。分岐部BSは、光源25と照射部22との間の光路上に配置される。また、識別装置3000は、示す分光部150によりラマン散乱光成分より高波数側に分光されるレイリー散乱成分を撮像可能なように不図示の撮像部を備える分光画像取得部10Aを有する点において第1の実施形態、及び、第2の実施形態と相違する。
次に、図6A、図6Bを用いて、第4の実施形態に係る識別装置4000について説明する。識別装置4000は、標準検体RMからの二次光に基づいて前記波長情報を取得する波長情報取得部295D、を有する点において識別装置1000、2000、3000のそれぞれと相違する。識別装置4000は、図6Bのように、載置部200が検体900iが搬送されるトラックTR1と平行に移動する、管状の標準検体RMが設けられているトラックTR0が設けられている点において、識別装置1000、2000、3000と相違する。
次に、図7A、図7Bを用いて、第5の実施形態に係る識別装置5000について説明する。識別装置5000は、光源25の駆動状態に関する情報に基づいて一次光の波長情報を取得する波長情報取得部295E、を有する点において識別装置1000、2000、3000、4000のそれぞれと相違する。本実施形態に係る波長情報取得部295Eは、光源25が備えるCAN型の半導体レーザ(不図示)の金属製の筺体の温度を光源25の温度として取得する。金属製の筺体はかかる半導体レーザの放熱体を兼ねている。
Claims (18)
- 検体を載置部に載置する載置部と、前記載置部に載置された前記検体に一次光を照射するために光源に光学的に結合する照射部と、前記検体からの二次光を採光する採光部と、
前記採光部が採光した二次光を分光する分光部と、前記分光部により分光された分光スペクトルを撮像しスペクトル像を取得する撮像部と、前記スペクトル像に基づき前記検体の性状を識別する識別装置であって、
前記一次光の波長に関する波長情報に基づいて前記スペクトル像に対応する波数シフトに関する情報を補正する補正部を有する識別装置。 - 前記波長情報を取得する波長情報取得部をさらに有する請求項1に記載の識別装置。
- 前記撮像部が出力する前記分光スペクトルに関する情報を前記波長情報と関連付けて記憶する記憶部をさらに有する請求項2に記載の識別装置。
- 前記補正部は、前記記憶部に記憶された前記分光スペクトルに関する情報に基づいて前記分光スペクトルの波数シフトに関する情報を補正する請求項3に記載の識別装置。
- 前記分光スペクトルに基づき前記検体の性状を識別する情報を取得する取得部をさらに有する請求項1から4のいずれか1項に記載の識別装置。
- 前記波長情報取得部は、前記光源から出力される前記一次光に関する情報に基づいて前記波長情報を取得する請求項1から5のいずれか1項に記載の識別装置。
- 前記光源と前記照射部との間に励起光を分岐する分岐部をさらに有し、
前記波長情報取得部は、前記分岐部から分岐された分岐光に基づいて前記波長情報を取得する請求項1から5のいずれか1項に記載の識別装置。 - 前記波長情報取得部は、前記二次光に含まれるレイリー散乱成分に基づいて前記波長情報を取得する請求項1から5のいずれか1項に記載の識別装置。
- 前記波長情報取得部は、標準検体からの二次光に基づいて前記波長情報を取得する請求項1から5のいずれか1項に記載の識別装置。
- 前記標準検体は、前記載置部において前記検体が載置される領域と重ならない領域に設けられる請求項9に記載の識別装置。
- 前記標準検体を洗浄するために洗浄部を含む請求項9または10に記載の識別装置。
- 前記波長情報取得部は、前記光源の駆動状態に関する情報に基づいて前記波長情報を取得する請求項1から5のいずれか1項に記載の識別装置。
- 前記駆動状態に関する情報は、前記光源の発振部の温度、消費電力量、放熱量の少なくともいずれかに関する情報を含む請求項12に記載の識別装置。
- 前記波数シフトが補正された前記検体の分光スペクトルを表示部に表示する表示制御部をさらに有する請求項1から13のいずれか1項に記載の識別装置。
- 前記表示制御部は、前記波数シフトの補正量に関する情報を前記表示部に表示する請求項14に記載の識別装置。
- 前記撮像部は、二次元に配列した複数の受光素子を備える請求項1から15のいずれか1項に記載の識別装置。
- 前記補正部は、前記一次光の波長に関する波長が増加したとき、前記撮像部が出力する前記波数シフトを増加するように補正を行う請求項1から16のいずれか1項に記載の識別装置。
- 前記補正部は、前記一次光の波長λ1がp倍変動したとき、前記撮像部が出力する受光素子に対応する前記波数シフトΔkが(1+(1―1/p)/(Δk×λ1))倍変化するように補正を行う請求項1から17のいずれか1項に記載の識別装置。
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