JP5088940B2 - Equipment for measuring the internal quality of agricultural products - Google Patents

Description

  The present invention relates to an agricultural product internal quality measuring device for nondestructively measuring the internal quality of agricultural products such as oranges and apples.

  Conventionally, an apparatus capable of nondestructively measuring internal quality such as sugar content and acidity of agricultural products has been proposed by spectroscopy using near infrared light. Many of these agricultural product internal quality measuring devices irradiate the produce with light from the light projecting means, and calculate the absorbance (absorbance of light by a specific component) from the transmitted light that has passed through the produce or the reflected light that has been reflected from the produce. Therefore, the internal quality such as sugar content and acidity is measured.

  That is, after irradiating light to a sample agricultural product and obtaining an absorbance spectrum from the light transmitted through or reflected from the agricultural product, the sugar or acidity of the sample agricultural product is measured by a well-known destructive test (for the sugar content, a refractive sugar meter, The acidity is obtained by a test using an electric conductivity meter, etc.), and an expression representing the correlation between the absorbance spectrum and the sugar content or the acidity is created and stored in advance as a calibration curve. Alternatively, by substituting the absorbance calculated from the reflected light into the calibration curve, the internal quality related to the sugar and acidity of the agricultural product was measured.

  Usually, the above-mentioned internal quality measuring device for agricultural products is equipped with a spectroscopic analysis means for analyzing transmitted light transmitted through the agricultural product or reflected light reflected from the agricultural product (these are referred to as “detection light” for convenience). The internal quality of agricultural products can be measured based on the analysis by the spectroscopic analysis means. However, in the spectroscopic analysis means, it is necessary to calibrate before measurement in order to avoid measurement errors due to changes over time. For this calibration, the light emitted from the light projecting means can be directly guided as reference light. Has been done.

For example, the internal quality measurement apparatus disclosed in Patent Document 1 includes a fiber support (selection means) for selectively taking in reference light or detection light into a spectroscopic analysis means, and the fiber support is vertically moved. By moving, calibration of the spectroscopic analysis unit is performed by capturing the detection light while capturing the reference light, and analyzing the detection light by the spectroscopic analysis unit by capturing the reference light while capturing the detection light. ing.
JP 2000-206037 A

  However, in the above-mentioned conventional agricultural product internal quality measuring device, it is necessary to dispose a plurality of mirrors (mirrors) in each of the optical path for guiding the detection light to the spectroscopic analysis means and the optical path for guiding the reference light. There was a risk that the measurement accuracy would deteriorate due to the change of the mirror over time (degradation due to peeling or oxidation). In addition, there is a problem that high processing accuracy is required to perform the mirror mounting position and angle with high accuracy, which increases manufacturing costs, and also makes running difficult because maintenance becomes difficult. .

  The present invention has been made in view of such circumstances, and provides an internal quality measuring device for agricultural products that can always improve measurement accuracy and can reduce manufacturing costs and running costs. is there.

The invention according to claim 1 is a light projecting unit that irradiates light to the agricultural product, a first light guide unit that guides detection light that is irradiated from the light projecting unit and transmitted or reflected by the farm product, and the light projecting. The light emitted from the means is guided as reference light, the second light guide means having an optical axis different from that of the first light guide means, and the detection light guided by the first light guide means or the second light guide means A selection means for optionally passing or blocking the reference light guided in step (b), and a spectroscopic analysis means for analyzing or calibrating the detection light passed by the selection means by the reference light. In the agricultural product internal quality measuring apparatus capable of measuring the internal quality of the agricultural product based on the analysis of the detection light, the selection means diffuses and reflects the reference light guided by the second light guiding means inside the first light guide. With a diffusion plate that leads to the optical axis of the light means To, the said selection means, and the calibration optical path forming portion for blocking the detection light while passing through the reference light through the diffusing plate, passes or dim the detection light while shielding the reference light An optical path forming part for measurement is formed, and driving means for driving the selecting means is provided so that the desired optical path forming part is located at a position corresponding to the optical axis of the first light guide means and the second light guide means. It is characterized by.

According to a second aspect of the invention, the internal quality measuring device of agricultural products as claimed in claim 1 Symbol placement, the diffusion plate includes an inlet portion for taking a reference beam to a site on the optical axis of the second light guiding means, It is a portion on the optical axis of the first light guide means, and is held by a holding member having a lead-out portion that allows the spectroscopic analysis means to pass reference light.

The invention according to claim 3 is the agricultural product internal quality measuring device according to claim 2 , wherein the diffuser plate is provided with a reflecting member having a high reflectance on at least the front surface and the back surface except for the portions corresponding to the introducing portion and the leading portion. It is characterized by being coated.

According to a fourth aspect of the present invention, in the agricultural product internal quality measuring device according to the second or third aspect , the inner surface of the holding member is coated with a reflective member having a high reflectance.

The invention according to claim 5 is the agricultural product internal quality measuring device according to any one of claims 1 to 4 , wherein the selection means includes a disk-shaped rotating plate in a circumferential direction of the rotating plate. The optical path forming portions are formed side by side.

A sixth aspect of the present invention is the agricultural product internal quality measuring device according to any one of the first to fourth aspects, wherein the selection means comprises a straight flat plate, and the optical path is formed in the longitudinal direction of the flat plate. The site is formed side by side.

  According to the first aspect of the present invention, the spectroscopic analysis unit includes the diffusion plate that guides the reference light guided by the second light guide unit to the optical axis of the first light guide unit while diffusing and reflecting the reference light. On the other hand, since no mirror is required in the middle of the optical path for guiding the detection light and the optical path for guiding the reference light, the measurement accuracy can always be improved and the manufacturing cost and the running cost can be reduced. it can. Further, since the reference light is guided to the spectroscopic analysis means while being diffusely reflected inside the diffuser plate, the reference light is made uniform by the diffuse reflection, and the spectroscopic analysis means can be calibrated with high accuracy.

Further, the selection means includes a calibration optical path forming part that shields the detection light while allowing the reference light to pass through the diffusion plate, and a measurement optical path formation part that allows the detection light to pass or be reduced while shielding the reference light. And a driving means for driving the selection means so that a desired optical path forming portion is located at a position corresponding to the optical axis of the first light guide means and the second light guide means. It can be performed more smoothly and easily.

In particular , the optical path forming part includes a calibration optical path forming part that shields the detection light while allowing the reference light to pass through the diffusion plate, and a measurement optical path forming part that allows the detection light to pass or attenuate while shielding the reference light. Therefore, selection of analysis and calibration by the spectroscopic analysis means can be performed more smoothly and easily.

According to the invention of claim 2 , the diffuser plate is a part on the optical axis of the second light guide means and takes in the reference light, and a part on the optical axis of the first light guide means and is a spectroscope. Since it is held by a holding member having a lead-out portion that allows the reference light to pass to the analysis means, the reference light can be more reliably guided to the spectroscopic analysis means while being diffusely reflected inside the diffuser, and can be referenced with high accuracy. Calibration with light can be performed.

According to the third and fourth aspects of the invention, the diffusion plate is formed by coating a reflective member having a high reflectance on at least the front surface and the back surface excluding portions corresponding to the introduction portion and the lead-out portion, or the inner surface of the holding member is Since it is formed by coating a reflecting member having a high reflectance, diffuse reflection within the diffusion plate can be performed more favorably.

According to the inventions of claims 5 and 6 , the selecting means is composed of a disk-shaped rotating plate, the optical path forming portions are formed side by side in the circumferential direction of the rotating plate, or the selecting means is composed of a linear flat plate, Since the optical path forming portions are formed side by side in the longitudinal direction of the flat plate, the selection by the selection means can be performed more easily and smoothly.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
The agricultural product internal quality measuring device according to this embodiment is for nondestructively measuring the internal quality of agricultural products such as mandarin oranges and apples, and as shown in FIGS. 1, a first light guide unit 2, a second light guide unit 3, a selection unit 4, and a spectroscopic analysis unit 5.

  The light projecting means 1 uses a light source k such as a halogen lamp to irradiate the produce N on the transport surface of the transport conveyor H with light (for example, light of 600 to 1100 nm), and is shown in FIGS. As described above, the cooling fin 11a is configured to include the casing 11 formed on the outer peripheral surface and the cooling fan f. The casing 11 accommodates therein a mask m that removes the influence of irregular reflection in the casing 11 and a condensing lens R2 at which the light emitted from the light source k is collected by the reflector r. Thus, the light transmitted through the condenser lens R2 is irradiated on the agricultural product N side.

  The first light guiding means 2 is for guiding the light irradiated from the light projecting means 1 and transmitted through the agricultural product N (referred to as “detection light”), and faces the light projecting means 1 with the agricultural product N in between. It consists of the optical fiber which has the light-receiving part 2a arrange | positioned, and is connected with the lens-barrel part 2c which has the condensing lens R1 included. That is, the detection light transmitted through the produce N and received by the light receiving portion 2a reaches the lens barrel portion 2c via the optical fiber, and is guided from the base end 2b to the spectroscopic analysis means 5 side. In the present embodiment, the first light guide unit 2 guides the light transmitted through the produce N. However, it is also possible to guide the light reflected from the produce N (also referred to as “detection light” in this case).

  The second light guide means 3 guides the light emitted from the light projecting means 1 as reference light and has a different optical axis from that of the first light guide means 2, and the tip 3 a faces the light projecting means 1. The end 3b is made of an optical fiber facing the spectroscopic analysis means 5. That is, while the first light guide unit 2 guides the detection light transmitted or reflected by the produce N, the second light guide unit 3 is configured to detect the light source k depending on the usage environment (temperature, etc.) of the light projecting unit 1. It is configured so as to be directly guided as reference light for calibrating a change in the light amount of the light source k due to a variation in the light amount or a change with time. For the sake of convenience, the optical axis of the first light guiding means 2 is denoted by reference numeral L1, and the optical axis of the second light guiding means 3 is denoted by reference numeral L2 (see FIG. 4).

  More specifically, the tip 3a side of the second light guide means 3 is fixed by being inserted through the mounting hole 12b of the mounting bracket 12 and fitted by the slit 12a, as shown in FIGS. The second light guide means 3 is bent by a predetermined angle α (about 35 degrees) so that the tip 3a of the light guide k faces a filament (not shown) of the light source k, so that the light from the light projecting means 1 can be more reliably obtained. It is configured to be able to lead to. Further, the base end 3b side of the second light guide unit 3 extends and is supported substantially in parallel with the lens barrel part 2c of the first light guide unit 2, and is supported from the base end 2b of the lens barrel part 2c. The detection light and the reference light from the base end 3b of the second light guide 3 are set to be substantially parallel. Thereby, the optical axis L1 of the 1st light guide means 2 and the optical axis L2 of the 2nd light guide means 3 differ.

  As shown in FIGS. 3 and 4, the selection means 4 optionally passes or blocks the detection light guided by the first light guide means 2 or the reference light guided by the second light guide means 3. As shown in FIGS. 3 and 4, it is composed of a disk-shaped rotating plate, and a plurality of optical path forming portions 4 a to 4 e are formed side by side in the circumferential direction of the rotating plate. The selection unit 4 is rotationally driven by a motor M as a driving unit, and a desired optical path forming part (any of the optical path forming parts 4 a to 4 e) is an optical axis of the first light guide unit 2 and the second light guide unit 3. It is configured to be in a position corresponding to L1 and L2.

  The spectroscopic analysis means 5 receives the detection light or reference light passed by the selection means 4 and calibrates the detection light by analysis or reference. As shown in FIG. 1, the reflecting mirror A1, the concave diffraction grating, A2 and the light receiving sensor B and a control device (not shown) are provided. When the detection light is detected by the light receiving sensor B, the information of the detection light is transmitted to a control device (not shown), and the control device can analyze the light reception information and measure the internal quality of the agricultural product. . The calibration of the spectroscopic analysis means 5 will be described later.

  On the other hand, the optical path forming portions 4a to 4e formed in the selecting means 4 allow the detection light or the reference light to pass or be shielded arbitrarily, and are mainly used for the calibration optical path forming portion and the measuring optical path forming portion. Separated. The calibration optical path forming portion shields the detection light while allowing the reference light to pass through the diffusing plate 7 so as to perform calibration, and these are indicated by reference numerals 4a and 4b in the figure. The measurement optical path forming portion allows the detection light to pass through while blocking the reference light so that the analysis of the detection light by the spectroscopic analysis means 5 is performed, and those indicated by reference numerals 4c to 4e in the figure correspond to this. . The detection light and the reference light that pass to the spectroscopic analysis means 5 side are taken in from the slits 5 a formed in the spectroscopic analysis means 5.

  The calibration optical path forming portion 4a is used for calibration to remove the influence of the light source k due to the change over time, and a portion for forming an optical path for allowing the reference light to pass to the spectroscopic analysis means 5 side (calibration optical path forming). 5, and includes a diffusion plate 7, a holding member C, and a cut filter 6. The diffuser plate 7 is for guiding the reference light guided by the second light guide means 3 to the optical axis L1 of the first light guide means 2 while diffusing and reflecting the reference light inside, for example, milk white light diffusion in the glass. An opal glass that uses diffusion characteristics by dispersing a substance, or a frost type that uses a frosting effect can be applied by polishing the substrate with an abrasive to form glass (sand surface).

  Further, as shown in FIG. 9, the diffuser plate 7 is formed by coating a reflective member 7a having a high reflectance on at least the front surface and the back surface except for the portions corresponding to the introduction portion 4ab and the lead-out portion 4aa. As this coating, for example, a portion where aluminum, gold or silver is deposited is preferable. Furthermore, the inner surface of the holding member C is preferably formed by coating a reflective member (aluminum, gold, silver, etc.) having a high reflectance. According to such a configuration, diffuse reflection within the diffuser plate 7 can be performed more favorably.

  The cut filter 6 is for selecting the wavelength of the reference light from the light projecting means 1 and allows the reference light in the desired wavelength range to pass while blocking the reference light in the lower wavelength range. ing. The holding member C is for holding the diffusing plate 7 while being fixed to the selection means 4. The holding member C is a part on the optical axis L 2 of the second light guide means 3 and introduces a reference portion 4 a for taking in the reference light. 1 is a part on the optical axis L1 of the light guide unit 2 and has a derivation unit 4aa that allows the spectroscopic analysis unit 5 to pass the reference light. The derivation | leading-out part 4aa is formed in the ellipse shape according to the shape of the slit 5a formed in the spectroscopic analysis means 5 (refer FIG. 3). A lead-out portion 4ba, a passage port 4ca, and a passage port 4da (4ea) described later have the same shape.

  Accordingly, since the diffusion plate 7 is held by the holding member C having the introduction portion 4ab and the lead-out portion 4aa, the reference light is more reliably guided to the spectroscopic analysis means 5 while being diffusely reflected inside the diffusion plate 7. And calibration with reference light can be performed with high accuracy. Further, the detection light from the first light guide unit 2 is shielded by the holding member C, and only the reference light from the second light guide unit 3 is selectively guided to the spectroscopic analysis unit 5.

  Similar to the optical path forming portion 4a, the wavelength calibration optical path forming portion 4b is a portion (calibration optical path forming portion) that forms an optical path for detecting the reference light and calibrating the spectroscopic analysis means 5, as shown in FIG. As shown in FIG. 4, a diffusion plate 7, a holding member C, a cut filter 6 and a wavelength calibration filter E are provided. The diffusing plate 7, the holding member C, and the cut filter 6 are the same as those of the optical path forming portion 4a, and the diffusing plate 7 is held by the holding member C having the introduction portion 4bb and the lead-out portion 4ba.

  The wavelength calibration filter E is a filter that is provided in the light guide portion 4ba of the holding member C and performs calibration of the spectroscopic analysis means 5 (specifically, wavelength calibration of the light receiving sensor B). Further, the detection light from the first light guide unit 2 is shielded by the holding member C, and only the reference light from the second light guide unit 3 is selectively guided to the spectroscopic analysis unit 5.

  The measurement optical path forming part 4c is a part (measurement optical path forming part) for allowing the detection light to pass to the spectroscopic analysis means 5 side and analyzing the detection light. As shown in FIG. 4ca and 4cb and an optical trap 8 are provided. The passage openings 4ca and 4cb are for allowing the detection light guided by the first light guide means 2 to pass to the spectroscopic analysis means 5 side. The optical trap 8 is for taking in the reference light guided by the second light guide means 3 from the introduction port 8a so that the reference light becomes stray light and does not affect the detection light. Thus, only the detection light from the first light guide unit 2 is selectively guided to the spectroscopic analysis unit 5.

  The measurement optical path forming part 4d (4e) is a part (measurement optical path forming part) for allowing detection light to pass through to the spectroscopic analysis means 5 side and analyzing the detection light, like the optical path forming part 4c. As shown in FIG. 8, a passage port 4da (4ea), 4db (4eb), an optical trap 8, and a neutral density filter 9 (10) are provided. The passage openings 4da (4ea), 4db (4eb), and the optical trap 8 are the same as those of the optical path forming portion 4c. The neutral density filter 9 (10) is to be selected according to the agricultural product N to be measured, and the neutral density filters having different attenuation ratios are the passage openings 4da (4ea), 4db ( 4eb), respectively.

Next, the operation of the agricultural product internal quality measuring device will be described.
First, the motor M is driven to rotate the selection unit 4 so that the optical path forming portion 4a is in a position corresponding to the optical axes L1 and L2 of the first light guide unit 2 and the second light guide unit 3. In this state, the detection light guided by the first light guide unit 2 is shielded by the holding member C, and the reference light guided by the second light guide unit 3 is spectroscopically analyzed via the diffusion plate 7. The guided light is guided to the means 5 side, and the guided reference light is detected by the light receiving sensor B. Since the light quantity of the light source k changes over time due to the surrounding conditions (temperature), lamp deterioration, and the like, calibration is performed to remove this influence.

  Thereafter, the motor M is driven again to rotate the selection unit 4 so that the optical path forming portion 4b is in a position corresponding to the optical axes L1 and L2 of the first light guide unit 2 and the second light guide unit 3. In this state, the detection light guided by the first light guide unit 2 is shielded by the holding member C, and the reference light guided by the second light guide unit 3 is diffused by the diffusion plate 7 and the wavelength calibration filter E. Thus, the guided reference light is detected by the light receiving sensor B. Thereby, calibration (wavelength calibration) of the spectroscopic analysis means 5 is performed.

  Thereafter, the motor M is driven to slightly rotate the selection means 4 so that any of the optical path forming portions 4a to 4e corresponds to the optical axes L1 and L2 of the first light guide means 2 and the second light guide means 3. Do not become. In such a state, the detection light guided by the first light guide unit 2 and the reference light guided by the second light guide unit 3 are not guided to the spectroscopic analysis unit 5 side. Value measurement (dark current measurement) can be performed.

  When the series of pre-processing steps (preparation steps) as described above are completed, the motor M is driven again so that any one of the optical path forming portions 4c to 4e is the optical axis of the first light guide means 2 and the second light guide means 3. The positions correspond to L1 and L2. For example, according to the produce N whose internal quality is to be measured, when the detection light is guided as it is to the spectroscopic analysis means 5 side, the optical path forming part 4c is the optical axis L1 of the first light guide means 2 and the second light guide means 3, When the detection light is guided to the spectroscopic analysis means 5 side while being attenuated at a predetermined attenuation rate, the optical path forming portion 4d or 4e is provided with the first light guide means 2 and the first light guide means 2 and the second light guide position. 2 Positions corresponding to the optical axes L1 and L2 of the light guide 3 are set.

  Thus, the reference light is shielded by the optical trap 8, and the detection light reaches the light receiving sensor B of the spectroscopic analysis means 5, and the wavelength of the detection light is analyzed. For example, from the light amount R (λ) of the reference light obtained by the optical path forming portion 4a, the light amount T (λ) of the detection light obtained by any of the optical path forming portions 4c to 4e, and the dark value D (λ). Absorbance K (λ) at each wavelength is calculated by the following equation.

K (λ) = log {(R (λ) −D (λ)) / (T (λ) −D (λ))}
While detecting the absorbance spectrum from the absorbance K (λ), a formula representing the correlation between the sugar content or the acidity is created and stored in advance as a calibration curve, and the absorbance calculated from the transmitted light of the agricultural product is second-order differentiated. Then, by substituting it into the calibration curve, it is possible to measure the internal quality related to the sugar content and acidity of the produce N.

  According to the above configuration, since the reference plate guided by the second light guide unit 3 is diffused and reflected inside, and the diffusion plate 7 is guided to the optical axis L1 of the first light guide unit 2, the spectroscopic analysis unit is provided. Since no mirror is required in the middle of the optical path for guiding the detection light to the reference light and the optical path for guiding the reference light, the measurement accuracy can always be improved and the manufacturing cost and the running cost can be reduced. be able to. Further, since the reference light is guided to the spectroscopic analysis means 5 while being diffusely reflected inside the diffuser plate 7, the reference light is made uniform by the diffuse reflection, and the spectroscopic analysis means 5 is accurately calibrated. Can do.

  Further, the selection means 4 is formed with a plurality of optical path forming portions 4a to 4e for arbitrarily passing or blocking the detection light or the reference light, and the desired optical path forming portions are formed by the first light guiding means 2 and the second light guiding portion. Since the motor M (driving means) for driving the selection means 4 is provided so as to correspond to the optical axes L1 and L2 of the light means 3, the selection by the selection means 4 can be performed more smoothly and easily. it can. Furthermore, since the selection means 4 is composed of a disk-shaped rotary plate and the optical path forming portions 4a to 4e are formed side by side in the circumferential direction of the rotary plate, the selection by the selection means 4 is performed more easily and smoothly. Can be made.

  In addition, the optical path forming part includes a calibration optical path forming part (4a, 4b) that shields the detection light while allowing the reference light to pass through the diffusion plate, and a measurement optical path formation that allows the detection light to pass while shielding the reference light. Therefore, the selection of analysis and calibration by the spectroscopic analysis means 5 can be performed more smoothly and easily.

  As mentioned above, although this embodiment was described, this invention is not limited to this, For example, as shown to FIG. 12, 13, pair of light projection means 1a and 1b which irradiate light from both sides of the produce N are included. The second light guide means 13a and 13b for guiding the reference light from the light projecting means 1a and 1b may be applied. In this case, as shown in FIG. 12, it is preferable to bend and form each tip 13aa, 13ba of the second light guide means 13a, 13b so as to face the light source side, and as shown in FIG. It is preferable that the light guide means 13a and 13b are gathered in the middle and guided to the selection means 4 side as one light guide means 13c. When the pair of second light guide means 13a and 13b is composed of a plurality of optical fibers, each of the light guide means 13c has a plurality of light beams so that the light is uniform at the tip 13ca of the light guide means 13c. It is preferable that the optical fibers are randomly arranged.

  Furthermore, in the said embodiment, although the selection means 4 consists of a disk-shaped rotary plate and the optical path formation site | parts 4a-4e are formed along with the circumferential direction of the said rotary plate, it replaces with this, FIG. As shown, the selecting means 14 may be formed of a straight flat plate, and the optical path forming portions 14a to 14d may be formed side by side in the longitudinal direction of the flat plate. In this case, the selection unit 14 is driven by the rack and pinion mechanism 15, and desired optical path forming portions (14 a to 14 d) correspond to the optical axes L 1 and L 2 of the first light guide unit 2 and the second light guide unit 3. To be in position. Even in this case, the selection by the selection means 14 can be performed more easily and smoothly.

The selection unit includes a diffusion plate that guides the reference light guided by the second light guide unit to the optical axis of the first light guide unit while diffusing and reflecting the reference light, and the selection unit receives the reference light via the diffusion plate. A calibration optical path forming part that shields the detection light while passing therethrough and a measurement optical path forming part that passes or attenuates the detection light while shielding the reference light are formed, and the desired light path forming part is the first light guide means. And if it is an agricultural product internal quality measuring device provided with a driving means for driving the selection means so as to be in a position corresponding to the optical axis of the second light guiding means, a device having a different external shape or another function is added. It can also be applied to things.

The plane schematic diagram which shows the internal quality measuring apparatus of the agricultural products which concern on embodiment of this invention Side view showing the internal quality measuring device for the agricultural product Schematic showing the selection means in the internal quality measuring device of the agricultural product A perspective view showing the selection means Schematic showing the optical path forming part for calibration according to the internal quality measuring device of the agricultural product Schematic showing the optical path forming part for wavelength calibration related to the internal quality measuring device of the agricultural product Schematic showing the optical path forming part for measurement according to the internal quality measuring device of the agricultural product Schematic diagram showing another optical path forming part for measurement related to the internal quality measuring device of the agricultural product (A) Perspective view (b) Longitudinal sectional view showing a diffusion plate in the internal quality measuring device of the agricultural product The top view which shows the light projection means in the internal quality measuring device of the agricultural product Sectional view showing the light projecting means The schematic diagram which shows the light projection means etc. in the internal quality measuring apparatus of the agricultural products which concern on other embodiment of this invention. The schematic diagram which shows the selection means and the spectroscopic analysis means vicinity in the internal quality measuring apparatus of the agricultural products based on the other embodiment The schematic diagram which shows the selection means in the internal quality measuring apparatus of the agricultural products which concern on other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light projection means 2 1st light guide means 3 2nd light guide means 4 Selection means 4a-4e Optical path formation part 5 Spectral analysis means 6 Cut filter 7 Diffusion plate 8 Optical trap 9, 10 Light reduction filter 11 Casing 12 Mounting bracket 13a , 13b Second light guide means 14 Selection means 14a to 14d Optical path forming portion N Agricultural product M Motor (drive means)
C holding member L1 optical axis (of the first light guide means) L2 optical axis (of the second light guide means)

Claims (6)

A light projecting means for irradiating the produce with light;
First light guiding means for guiding detection light irradiated from the light projecting means and transmitted or reflected by the agricultural product;
Guiding the light emitted from the light projecting means as reference light, and a second light guiding means having an optical axis different from that of the first light guiding means;
A selection means for optionally passing or blocking the detection light guided by the first light guide means or the reference light guided by the second light guide means;
Spectroscopic analysis means for analyzing or calibrating the detection light passed by the selection means with reference light;
In the agricultural product internal quality measuring device capable of measuring the internal quality of the agricultural product based on the analysis of the detection light by the spectroscopic analysis means,
The selection means includes a diffusion plate that guides the reference light guided by the second light guide means to the optical axis of the first light guide means while diffusing and reflecting the reference light inside.
The selection means includes a calibration optical path forming part that blocks the detection light while allowing the reference light to pass through the diffusion plate, and a measurement unit that passes or reduces the detection light while blocking the reference light. And an optical path forming portion, and driving means for driving the selection means so that a desired optical path forming portion is located at a position corresponding to the optical axis of the first light guide means and the second light guide means. An internal quality measuring device for agricultural products. The diffusion plate is a part on the optical axis of the second light guide unit and takes in the reference light, and a part on the optical axis of the first light guide unit and the reference light to the spectroscopic analysis unit internal quality measuring apparatus for agricultural products as claimed in claim 1 Symbol mounting, characterized in that it is held by the holding member having a derivation portion for passing. 3. The agricultural product internal quality measuring device according to claim 2 , wherein the diffusion plate is formed by coating a reflective member having a high reflectance on at least the front surface and the back surface except for the portions corresponding to the introduction portion and the lead-out portion. Said inner surface of the holding member, the internal quality measuring apparatus for agricultural products as claimed in claim 2 or claim 3 wherein the reflectance is made by coating the high reflection member. The agricultural product according to any one of claims 1 to 4 , wherein the selection means includes a disk-shaped rotating plate, and the optical path forming portions are formed side by side in a circumferential direction of the rotating plate. Internal quality measuring device. The internal quality of agricultural products according to any one of claims 1 to 4 , wherein the selection means is formed of a linear flat plate, and the optical path forming portions are formed side by side in the longitudinal direction of the flat plate. measuring device.

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