JP3989360B2 - Quality evaluation device calibration method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention projects the measurement light including the wavelength for quality evaluation on the fruit and vegetables as the measurement object, and evaluates the quality of the measurement object from the light reception information of the light transmitted through the measurement object. Measurement target for quality evaluation device calibration whose quality is evaluated by the evaluation deviceThe quality evaluation device is calibrated usingThe present invention relates to a quality evaluation apparatus calibration method.
[0002]
[Prior art]
As a measurement object for calibration of a quality evaluation apparatus having the above-described configuration, conventionally, when a quality evaluation apparatus to be calibrated measures sugar content and acidity of fruits and vegetables such as tangerine and peach as measurement objects, There is a configuration in which an aqueous solution having a quality similar to the quality of fruit vegetables, for example, the quality of acidity and sugar content, is provided as a quality evaluation target. Specifically, a 1% strength aqueous solution of citric acid as a quality evaluation target having the same acidity as fruit vegetables is stored in a light-transmitting container, and the temperature of the aqueous solution of citric acid is as follows. It was the structure provided with the temperature sensing element for measuring. Incidentally, such an aqueous solution of citric acid has light absorption characteristics similar to the light absorption characteristics corresponding to the acidity with respect to the wavelength for quality evaluation of fruit vegetables.
Further, since the light absorption characteristics with respect to the wavelength for quality evaluation as described above fluctuate when the temperature of the aqueous solution changes, the evaluation is performed when the quality evaluation apparatus evaluates the quality of the measurement object for calibration of the quality evaluation apparatus. In association with the result, the temperature of the aqueous solution is measured by the temperature measuring body (see Patent Document 1).
[0003]
Moreover, as a quality evaluation apparatus calibration method using such a measurement object for quality evaluation apparatus calibration, the quality evaluation apparatus is evaluated by evaluating the quality of the measurement object for quality evaluation apparatus calibration by the quality evaluation apparatus to be calibrated. When the result is stored as a reference value and the quality evaluation apparatus is calibrated, the quality evaluation apparatus evaluates the quality of the measurement object for quality evaluation apparatus calibration again, and the evaluation result and the reference value A method of calibrating the quality evaluation apparatus based on the difference can be considered.
By the way, in the measurement object for calibration of the quality evaluation apparatus as described above, the quality that is measured by the quality evaluation apparatus varies when the temperature changes. Therefore, it is preferable to measure the temperature of the quality evaluation object by temperature measuring means such as a temperature measuring body.
[0004]
[Patent Document 1]
JP 2000-199743 A (page 16, FIG. 4, FIG. 5, FIG. 7)
[0005]
[Problems to be solved by the invention]
In the measurement object for calibration of the conventional quality evaluation apparatus, an aqueous solution having a light absorption characteristic similar to the light absorption characteristic for the wavelength for quality evaluation of fruit vegetables is used as a quality evaluation target. When preparing a measurement object for calibration of the evaluation device, there is a disadvantage that it takes annoying trouble of adjusting the concentration of the aqueous solution to an appropriate concentration so as to correspond to the quality of the measurement object. When a plurality of types of fruits and vegetables are targeted, it is necessary to create different quality aqueous solutions for different types of measurement objects, which is troublesome. Moreover, the aqueous solution prepared as described above may change from the initially adjusted concentration over time due to moisture evaporation, secular change, etc., and the quality of the measurement object for quality evaluation device calibration is in the initial state. There is also a disadvantage that it cannot be maintained.
[0006]
The present invention has been made paying attention to such a point, the purpose of which is to provide a measured object for calibration of the quality evaluation apparatus that can reduce the labor of calibrating the quality evaluation apparatus as much as possible, The object of the present invention is to provide a quality evaluation apparatus calibration method using such a measurement object for quality evaluation apparatus calibration.
[0007]
[Means for Solving the Problems]
  The quality evaluation apparatus according to claim 1Calibration methodIs a quality evaluation device that projects measurement light including a wavelength for quality evaluation onto fruit vegetables as a measurement object, and evaluates the quality of the measurement object from light reception information of light transmitted through the measurement object The quality is evaluated byA method of calibrating the quality evaluation device using a measurement object for quality evaluation device calibration,
  The measurement object for calibration of the quality evaluation apparatus isProvided with pure water as a quality evaluation object whose quality is evaluated by the quality evaluation deviceAnd
  The quality in the measurement object for calibration of the quality evaluation device at the time of calibration formula creation for creating a calibration formula for obtaining a calibration value corresponding to the quality of the measurement target object from light reception information of light transmitted through the measurement target object Based on the light reception information of the light transmitted through the evaluation target and the calibration formula, measure a reference calibration value corresponding to the quality of the quality evaluation target,
  At the time of device calibration for calibrating the quality evaluation device, based on the light reception information of the light transmitted through the quality evaluation target in the measurement target for quality evaluation device calibration and the calibration formula, the quality of the quality evaluation target is adjusted. Measure the corresponding calibration calibration value,
  When evaluating the quality of the measurement object by the quality evaluation device, a calibration value corresponding to the quality of the measurement object obtained based on the received light information of the light transmitted through the measurement object and the calibration equation, Correction is performed based on the difference between the calibration calibration value and the reference calibration value.It is characterized by that.
[0008]
That is, since pure water is provided as a quality evaluation object whose quality is evaluated by the quality evaluation device, when the quality evaluation device is calibrated using the measurement target for quality evaluation device calibration, the quality evaluation device is pure. The measurement result is obtained as a result of evaluating the quality of pure water from the received light information of the light transmitted through the pure water by projecting the measurement light including the wavelength for quality evaluation to the water. The quality evaluation apparatus is calibrated based on the measured result.
[0009]
For example, about 90% of mandarin orange, which is an example of fruit vegetables, is water. As represented by this mandarin, fruit vegetables contain a lot of water. As described above, the light receiving information of the light transmitted through the measurement light including the wavelength for quality evaluation by the quality evaluation apparatus, such as the light absorption characteristic at the wavelength for quality evaluation, etc. The characteristics are almost the same as those of water. By using water as a quality evaluation target, it is possible to obtain light reception information having light absorption characteristics at the same wavelength for quality evaluation as fruit vegetables. .
[0010]
If the quality of fruit and vegetables is to be evaluated, for example, regarding the acidity or sugar content, first, before the quality evaluation of the measurement object by the quality evaluation apparatus, the quality evaluation apparatus calibrates the quality evaluation apparatus. The quality of the measurement object is evaluated and the evaluation result in the initial state is measured. At this time, since pure water contains no components other than water, the evaluation result corresponds to a state in which the acidity or sugar content is zero.
In addition, when performing the calibration process for the quality evaluation device, the quality evaluation device again evaluates the quality of the measurement target for quality evaluation device calibration, measures the evaluation result for calibration, and the evaluation result is If the initial state, that is, the evaluation result corresponding to the state where the acidity or sugar content is zero, it is possible to detect that a measurement error due to secular change or the like has occurred, and based on the measurement result Thus, the quality evaluation apparatus can be calibrated.
Moreover, unlike water that contains impurities such as tap water, pure water does not contain any components other than water, so there is no change in quality due to aging due to impurities, and it is easy to maintain quality in the initial state. It becomes.
[0011]
  The processing for creating the calibration formula as described above is a work necessary for the quality evaluation apparatus to evaluate the quality of the fruit and vegetable as the measurement object. For example, the light reception information of the light transmitted through the measurement object Assuming that the quality of the measurement object is evaluated based on the spectral spectrum data corresponding to the light absorption characteristics for each wavelength, a calibration equation using the second derivative information of the spectral spectrum data at a specific wavelength as a variable Some are created in advance. In this case, based on the spectrum data obtained for the measurement object, a second derivative value of the spectrum data at the specific wavelength is calculated, and the quality of the measurement object is calculated from the information and the calibration formula. The corresponding calibration value will be obtained.
  That is, the correspondence between the quality measurement result obtained by measurement by the quality evaluation apparatus and the quality of the actual measurement object (fruit and vegetables) is obtained as a function based on the actual measurement value.
  Then, when the calibration formula as described above is created, the quality evaluation target quality is supported on the basis of the light reception information of the light transmitted through the quality evaluation target in the measurement target for quality evaluation apparatus calibration and the calibration formula. The reference calibration value to be measured is measured in advance. Thereafter, using the quality evaluation apparatus, based on the light reception information obtained for the measurement object, the work for obtaining a calibration value corresponding to the quality of the measurement object from the information and the calibration equation is performed. Become.
  Next, at the time of calibration of the quality evaluation device, the quality evaluation target quality is supported based on the light reception information of the light transmitted through the quality evaluation target in the measurement target for quality evaluation device calibration and the calibration formula. Measure calibration value for calibration. In other words, the measurement result of the quality evaluation device is shifted to a value different from an appropriate value due to a secular change or the like as the work for obtaining the calibration value corresponding to the quality of the measurement object as described above is performed. There is. Therefore, a calibration calibration value corresponding to the quality of the quality evaluation object is measured using the measurement target for calibration of the quality evaluation apparatus, and if the calibration calibration value is not different from the reference calibration value, the measurement result is shifted. However, if there is a difference between the two, there is a deviation in measurement results.
  Therefore, when the quality of the measurement object is evaluated by the quality evaluation device, a calibration value corresponding to the quality of the measurement object obtained based on the light reception information of the light transmitted through the measurement object and the calibration formula is used for calibration. By correcting based on the difference between the calibration value and the reference calibration value, the calibration value is corrected so as to obtain a measurement result corresponding to the initial state in which the reference calibration value is measured.
In this way, it has become possible to provide an evaluation device calibration method capable of calibrating the internal quality evaluation device using the measurement target for quality evaluation device calibration.
[0012]
  The quality evaluation apparatus according to claim 2Calibration methodIn claim 1The measurement object for calibration of the quality evaluation apparatus isIt is characterized by comprising temperature measuring means for measuring the temperature of the pure water.
[0013]
That is, even when pure water is used as a quality evaluation target, the quality of the quality evaluation target, particularly the light absorption characteristics of the wavelength for quality evaluation, may change due to a change in temperature. By measuring the temperature of the pure water when the quality of the pure water is evaluated by the evaluation device by the temperature measuring means, the quality evaluation device can be properly calibrated based on the measurement information.
[0014]
When the explanation is added, when the quality evaluation apparatus evaluates the quality of the measurement object for calibration and sets the evaluation result in the initial state as the reference value, for example, the temperature of pure water as the quality evaluation object is set. When calibrating a quality evaluation device by storing and storing a plurality of reference values when various changes are made, correlations of changes in reference values with respect to temperature changes when the temperature of pure water is changed, etc. When the quality evaluation device evaluates the quality of the measured object and obtains the evaluation result, the temperature measuring means measures the temperature of pure water as the quality evaluation object, and the evaluation result and the temperature at that time are measured. By correcting the evaluation result in the quality evaluation apparatus to an appropriate value while comparing with the reference value of the corresponding temperature, the quality evaluation apparatus can be properly calibrated.
[0015]
  The quality evaluation apparatus according to claim 3The calibration method according to claim 1, wherein the measurement target for calibration of the quality evaluation apparatus is:A quality evaluation object whose quality is evaluated by the quality evaluation device is provided in a state where the temperature adjustment means holds the set temperature at a set temperature.
[0016]
That is, since the quality evaluation object whose quality is evaluated by the quality evaluation apparatus is provided in a state where the temperature adjustment means holds the set temperature, the quality evaluation object is always held at the set temperature. In other words, the quality evaluation target is held at the set temperature even when the quality evaluation device evaluates the quality of the measurement object for calibration and sets the evaluation result in the initial state as the reference value. In order to calibrate the evaluation device, the quality evaluation object is held at the set temperature even when the quality evaluation device evaluates the quality of the measurement object for quality evaluation device calibration and obtains the evaluation result for calibration. Therefore, the quality can be evaluated in a state where there is no measurement error due to the quality variation caused by the temperature change of the quality evaluation target regardless of the variation in the external temperature.
[0017]
In this way, each of the evaluation result in the initial state and the evaluation result for calibration corresponds to the measurement result at the same temperature, so it is possible to calibrate the device properly with little measurement error due to temperature change. The troublesome work of measuring the temperature of the quality evaluation target when correcting the quality of the measurement object for calibration of the quality evaluation apparatus by the quality evaluation apparatus and the troublesome work of correcting the measurement result in response to temperature fluctuations It is unnecessary.
[0018]
In particular, if pure water is provided as a quality evaluation target, the pure water does not contain impurities other than water, so there is no change in quality due to aging due to impurities, and due to temperature changes as described above. In addition to the small measurement error, the quality change due to secular change is also small, so that the apparatus can be calibrated in an appropriate state with a smaller error.
[0020]
  The quality evaluation apparatus according to claim 4Calibration methodIn claim 3,The measurement object for calibration of the quality evaluation apparatus isThe storage unit in which the quality evaluation target is stored and the temperature adjusting means are integrally assembled into a unit shape.
[0021]
In other words, since the storage unit in which the quality evaluation target is stored and the temperature adjusting means are integrally assembled in a unit shape, the quality evaluation target is always set to a set temperature even when the quality evaluation device is not calibrated. Will be held in. Therefore, in order to perform calibration from a state where the quality evaluation device is installed at a location different from the location where the quality evaluation device is installed, a measurement light is projected by the quality evaluation device on the measurement target for calibration of the quality evaluation device. Even if it is set at the target position, the quality evaluation target is always maintained at the set temperature by the integrated temperature adjustment means. Measurement processing can be performed.
[0022]
For example, if the storage unit in which the quality evaluation target is stored and the temperature adjusting means are stored separately, the quality evaluation target always changes according to the ambient temperature change at that time. Therefore, in order to perform calibration, when the measurement target for calibration of the quality evaluation apparatus is set at the measurement target position in the quality evaluation apparatus, the temperature evaluation means is used so that the quality evaluation target becomes the set temperature. Although there is a disadvantage that annoying work for adjusting the temperature is necessary, according to the above configuration, since the quality evaluation target is always kept at the set temperature, such troublesome work is unnecessary and the work efficiency is improved. Can do.
[0027]
  Claim5Described quality evaluation equipmentCalibration methodAre claims 1 to4In eitherThe measurement object for calibration of the quality evaluation apparatus isA light incident side light passing part that diffuses the measurement light and leads it to the quality evaluation object, and a light outgoing side light passage part that diffuses the light that has passed through the quality evaluation object and leads it to the outsideIs configured withIt is characterized by that.
[0028]
That is, when a quality evaluation apparatus is calibrated using an object to be measured for quality evaluation apparatus calibration, the quality evaluation apparatus projects measurement light including a wavelength for quality evaluation onto the quality evaluation object, and the quality A measurement result is obtained as an evaluation of the quality of the quality evaluation object from the light reception information of the light transmitted through the evaluation object, and the quality evaluation apparatus is calibrated based on the obtained measurement result. The light is diffused through the light incident side light passing portion and guided to the quality evaluation target, and the light transmitted through the quality evaluation target is diffused through the light output side light passing portion and guided to the outside.
[0029]
Thus, since the light incident side light passing part and the light exiting side light passing part are respectively provided, it is not necessary to have a function of diffusing light on the quality evaluation target itself, and it is diffused in the same manner as the light transmitted through the fruit vegetables. Although it is possible to properly calibrate the quality evaluation device based on the received light information of the light, as a quality evaluation object, a substance that does not have a light diffusion function but has light absorption characteristics similar to fruit vegetables, For example, it is possible to use simple things such as only pure water.
[0030]
  Claim6Described quality evaluation equipmentCalibration methodClaims5InThe measurement object for calibration of the quality evaluation apparatus isAs the light exit side light passage section, the light exit side light passage for transmission that guides the light that has been guided through the light entrance side light passage section and passed through the quality evaluation target to the outside along the direction in which the measurement light is projected. And a semi-transmission light-emitting side light passage unit that guides light that has been guided through the input-side light passage unit and passed through the quality evaluation target to the outside along a direction orthogonal to the direction in which the measurement light is projected It is characterized by comprising.
[0031]
That is, the light that has been transmitted along the direction in which the measurement light is projected out of the light that has been guided to the quality evaluation target through the light incident side light passage unit and passed through the quality evaluation target is transmitted through the light output side light passage unit for transmission. Can lead to the outside through. In addition, the light transmitted through the quality evaluation target and transmitted along the direction orthogonal to the direction in which the measurement light is projected can be guided to the outside through the light transmission side light passing portion for semi-transmission.
[0032]
In other words, as a quality evaluation device, a transmission type in which a light projecting unit that projects measurement light and a light receiving unit that receives light that has passed through the measurement object are distributed on both the left and right sides of the measurement target location where the measurement target is located. If it is this quality evaluation apparatus, a measurement result can be obtained as what evaluates the quality of quality evaluation object based on the light guide | induced to the exterior from the light emission side light passage part for transmissions as mentioned above.
And as a quality evaluation device, the light projecting unit for projecting the measurement light is arranged at both the left and right sides of the measurement target location where the measurement target is located, and the light receiving unit that receives the light transmitted through the measurement target, If the semi-transmission type quality evaluation apparatus is arranged below or above the measurement object, the quality evaluation object is based on the light guided to the outside from the light transmission part for the semi-transmission light-emitting side as described above. Measurement results can be obtained as an evaluation of quality.
[0033]
Therefore, it is possible to perform calibration using the measurement object for calibrating the quality evaluation device, regardless of whether the quality evaluation device is a transmissive quality evaluation device or a transflective quality evaluation device.
[0034]
  Claim7Described quality evaluation equipmentCalibration methodClaims4InThe measurement object for calibration of the quality evaluation apparatus isThe quality evaluation object is storedSaidAn outer casing is provided to cover the storage part in a state where an air layer is formed on the outer peripheral part of the storage part, and the temperature adjusting means is configured to perform temperature control on the air layer. To do.
[0035]
That is, an air layer is formed on the outer peripheral portion of the storage portion in which the quality evaluation target is stored by the outer casing, and the temperature adjustment unit indirectly sets the quality evaluation target by the temperature adjusting means acting on the air layer. It will be held at temperature. In this way, the temperature adjustment means does not directly adjust the temperature by directly acting on the storage unit in which the quality evaluation target is stored, but indirectly adjusts the temperature via the air layer, so that the quality evaluation target is stored. Since there is no temperature adjustment member in the storage section, there are no disadvantages such as deterioration of the characteristics of the quality evaluation target due to corrosion or chemical change of such temperature adjustment members, and good characteristics can be obtained. It becomes easy to maintain over a long period of time.
[0036]
  Claim8Described quality evaluation equipmentCalibration methodClaims7InThe measurement object for calibration of the quality evaluation apparatus isThe storage portion is made of a translucent member, and the outer casing is made of a non-translucent member.In addition, a light incident side light passage part that diffuses the measurement light and leads it to the quality evaluation object and a light emission side light passage part that diffuses the light that has passed through the quality evaluation object and leads it to the outside are formed.It is characterized by that.
[0037]
That is, since the outer casing is made of a non-translucent member, the light incident side light passage portion and the light emission side light passage portion are formed, and the storage portion is made of a light transmissive member. The measurement light is diffused through the light incident side light passage portion formed in the outer casing and guided to the quality evaluation target through the light-transmitting storage portion. And the light which passed the quality evaluation object passes the storage part which has translucency, is diffused through the light emission side light passage part formed in the outer casing, and is guide | induced outside.
[0038]
Therefore, after the state in which only the measurement light is diffused passes and passes through the quality evaluation target, it can be taken out as light reception information, and the portions other than the portion through which the measurement light passes are made of a non-translucent member. Since the passage of light is blocked, errors due to disturbance can be reduced and light reception information for calibration can be obtained.
[0045]
DETAILED DESCRIPTION OF THE INVENTION
[0046]
[First Embodiment]
Hereinafter, a first embodiment of a measured object for calibration of a quality evaluation apparatus and a quality evaluation apparatus calibration method using the same according to the present invention will be described with reference to the drawings.
[0047]
First, a transmission-type quality evaluation apparatus H1 that is a calibration target by the measurement object for calibration of the quality evaluation apparatus according to the first embodiment will be described. This apparatus H1 is an apparatus for measuring sugar content and acidity as the quality of fruits and vegetables such as mandarin orange as a measurement object, and as shown in FIG. 1, a light receiving unit 2 that receives light transmitted through the measurement object M, measures the received light, and a control unit 3 as a control unit that controls the operation of each unit. M is configured to be placed and conveyed in a line in a row by a conveyer 4 as a conveying means, and is configured so as to sequentially pass through the measurement target portions by this apparatus. Then, the light projecting unit 1 and the light receiving unit 1 receive light in a state where light projected from the light projecting unit 1 is received by the light receiving unit 2 after passing through the measurement target M with respect to the measurement target M located at the measurement target location. The part 2 is configured as a transmission-type quality evaluation apparatus that is arranged on both the left and right sides of the measurement target portion, that is, on both sides in the conveyance lateral width direction of the conveyor 4.
[0048]
Next, the configuration of the light projecting unit 1 will be described.
The light projecting unit 1 includes two light sources, and is configured to irradiate light from the two light sources onto a measurement target located at a measurement target location using different irradiation optical axes. Yes. Further, the two optical axes for irradiation by the respective light sources are configured to intersect at or near the surface portion of the measurement target located at the measurement target location.
That is, as shown in FIG. 7, a light source 5 composed of two halogen lamps separated along the transport direction by the transport conveyor 4 is provided, and the following is provided corresponding to each of the two light sources 5. An optical system is provided. That is, a concave light reflecting plate 6 is provided as a light collecting means for reflecting light emitted from the light source 5 and focusing on the surface of the measurement object M, and is collected by the light reflecting plate 6. A diaphragm plate 7 and a diaphragm plate that are positioned so as to correspond to the focal position of the light to be transmitted and suppress the spread of the light after being condensed by passing through a large diaphragm hole 7a to the radially outward side The light amount adjusting plate 8 that can be switched between a state in which the light that has passed through 7 is allowed to pass through, a state in which the light passes through a small aperture 8a, and a state in which the light is blocked can be switched. Each of the collimator lens 9 to be changed into the following, the reflecting plate 10 that reflects and bends the light changed to parallel light, and the condensing lens 11 that condenses the light reflected by the reflecting plate 10 are provided for one light source 5. It is provided as an optical system. Each light quantity adjusting plate 8 is integrally rocked by an electric motor 12 and can be switched to each state.
[0049]
As shown in FIGS. 1 and 3, the light projecting unit 1 has a configuration in which each member as described above is built in the casing 13 and assembled in a unit shape. In addition, the light projecting unit 1 is provided in an oblique posture so that light is emitted obliquely downward with respect to the measurement target located at the measurement target location.
[0050]
Next, the configuration of the light receiving unit 2 will be described.
As shown in FIG. 3, the light receiving unit 2 includes a collimator lens 14 that changes the light transmitted through the measurement object M to parallel light, and a wavelength region (600 nm) of a measurement target that will be described later among the light changed to parallel light. Bandpass mirror 15 that reflects only light in the range of up to 1000 nm upward and passes light of other wavelengths as it is, and condensing lens 16 that condenses the measurement target light reflected upward by bandpass mirror 15. The shutter mechanism 17 that can be switched between an open state in which the light that has passed through the condenser lens 16 is allowed to pass through and a shielding state that blocks the passage of the measurement target light, and light that has passed through the shutter mechanism 17 in the open state are incident. Then, the amount of light that has passed straight through the spectroscope 18 and the bandpass mirror 15 that spectrally divides the light and measures the spectral data. It is configured to include a like light-power detection sensor 19 for detecting. In the figure, E is a filter switching mechanism for switching a filter for wavelength calibration.
[0051]
As shown in FIG. 5, the spectroscope 18 reflects the measurement target light that has entered from the light entrance 20 that is the light receiving position, and splits the reflected measurement target light into light of a plurality of wavelengths. The concave diffraction grating 22 and the light receiving sensor 23 that measures the spectral spectrum data by detecting the light intensity at each wavelength in the measurement target light spectrally separated by the concave diffraction grating 22 shields light from the outside. The structure is arranged in a dark box 24 made of a material. The light receiving sensor 23 is composed of a 1024-bit charge accumulation type CCD line sensor that simultaneously receives the light spectrally reflected by the concave diffraction grating 22 for each wavelength and converts it into a signal for each wavelength and outputs it. Has been. Although this line sensor is not described in detail, a photoelectric conversion unit that converts a light amount into an electric signal (charge) for each unit pixel, a charge storage unit that stores charges obtained by the photoelectric conversion unit, and A drive circuit for outputting the stored charge to the outside is provided. The charge accumulation time can be changed from the outside via a drive circuit.
[0052]
As shown in FIG. 6, the shutter mechanism 17 includes a disk 17A having a plurality of radial slits 25 in a state of being rotated around a vertical axis by a pulse motor 17B. When the slits 25 overlap with each other, the light entrance 20 of 24 has an open state that allows light to pass therethrough, and when the position of the slit 25 shifts, it has a blocking state that blocks light. A transmission hole 27 is formed, and the disk 17A is arranged in a state of sliding in close contact with the light entrance 20 of the dark box so as not to leak light. That is, this shutter mechanism 17 is provided in the state close to the light entrance 20 with respect to the concave diffraction grating 22 as a spectroscopic means.
Similarly to the light projecting unit 1, the light receiving unit 2 has a configuration in which the above-described members are housed in a casing 28 and assembled in a unit shape as shown in FIGS. 1 and 3.
[0053]
Further, the light projecting unit 1 and the light receiving unit 2 can be integrated with the vertical position adjusting mechanism 29 that can adjust the position of the light projecting unit 1 and the light receiving unit 2 in the vertical direction with respect to the apparatus frame F, and the light projecting unit 1 and the light receiving unit 2 are separately provided. A horizontal position adjusting mechanism 30 that is adjustable in position along the direction of approaching and separating from the measurement object located at the measurement target position with respect to the frame body F, that is, in the horizontal direction and orthogonal to the transport direction of the transport conveyor. Is provided.
In addition, as shown in FIG. 1 to FIG. 4, the four fixed support rods 31 are provided in a state where they are suspended from the upper part of the apparatus frame F in a fixed state. A support base 32 for mounting and supporting a measurement target A for quality evaluation apparatus calibration, which will be described later, is attached to the lower end of the bar 31. A lifting platform 34 is supported on the four fixed support rods 31 by four sliding support portions 33 so as to be slidable in the vertical direction. Further, a feed screw 35 supported in a suspended state from an upper side portion of the apparatus frame F is rotatably provided by an electric motor 36, and a female screw member 37 provided on the lifting platform 34 is provided on the feed screw 35. They are screwed together, and the lifting platform 34 can be adjusted to move up and down to an arbitrary position by rotating the feed screw 35 with an electric motor 36. The feed screw 35 is also configured to be rotatable by a manual operation handle 38. In this way, the screw feed type vertical position adjusting mechanism 29 is configured.
[0054]
As shown in FIG. 4, the lifting platform 34 is provided with two guide bars 39 extending along the direction in which the light projecting unit 1 and the light receiving unit 2 are arranged, and the light projecting unit assembled in a unit shape. Each of the part 1 and the light receiving part 2 is configured to be slidably supported by the guide rods 39 via support members 40 and 41. Each guide bar 39 is connected by a connecting tool 39a at both ends in the longitudinal direction. In addition, the elevator 34 is provided with two feed screws 42 and 43 extending along the direction in which the light projecting unit 1 and the light receiving unit 2 are arranged, and can be rotated by electric motors 44 and 45, respectively. Female screw portions 46 and 47 provided in the support members 40 and 41 are screwed into the feed screws 42 and 43, and the feed screws 42 and 43 are rotated forward and backward by the electric motors 44 and 45, respectively. By doing so, the light projecting unit 1 and the light receiving unit 2 can be individually adjusted in position along the horizontal direction orthogonal to the transport direction of the transport conveyor 4. In this way, the screw feed type horizontal position adjusting mechanism 30 is configured.
[0055]
Therefore, when the feed screw 35 is rotated by the electric motor 36, the lifting / lowering base 34 is adjusted to move up / down. Accordingly, the light projecting unit 1 and the light receiving unit 2 supported by the lifting / lowering base 34 are integrated. It is possible to adjust the vertical movement, and by rotating each of the electric motors 44 and 45, the light projecting unit 1 and the light receiving unit 2 are individually adjusted along the horizontal direction perpendicular to the transport direction of the transport conveyor 4. be able to.
[0056]
A reference filter 49 is provided in a state of being supported by a support arm 48 which is positioned above the planned passage location of the measurement object M on the conveyor 4 and extends downward from the support base 32. The reference filter 49 is composed of an optical filter having a predetermined absorbance characteristic, and specifically includes a pair of opal glasses.
[0057]
As shown in FIG. 1, the measurement object on which the light from the light projecting unit 1 is placed on the transport conveyor 4 by adjusting the vertical movement of the light projecting unit 1 and the light receiving unit 2 by the vertical position adjusting mechanism 29. The normal measurement state in which the light receiving unit 2 receives light after passing through the object M and the light receiving unit 2 after the light from each light projecting unit 1 passes through the reference filter 49, as indicated by the phantom lines in FIG. As shown by the solid line in FIG. 2 and the reference measurement state received at, the measurement information for calibration as described later can be switched.
[0058]
The control unit 3 is configured using a microcomputer, and as shown in FIG. 10, the internal quality of the measurement object is determined based on the detection information of the passage detection sensor 500, the light amount detection sensor 19, and the light reception sensor 23. An analysis unit 100 for analysis and an operation control unit 101 as a control unit for controlling the operation of each unit are provided in a control program format. That is, a calculation process for analyzing the internal quality of the measurement object M is performed using a spectroscopic analysis technique that is a publicly-known technique as will be described later, and the shutter mechanism 17, the light amount adjustment motor 12, the vertical position adjustment motor 36, It is configured to control the operation of each part such as management of the operation of the horizontal position adjusting motors 44 and 45.
[0059]
Next, a control operation by the operation control unit 101 will be described.
Prior to normal measurement of the measurement object M, the operation control unit 101 irradiates the reference filter 49 with light from the light projecting unit 1 instead of the measurement object M, and transmits light from the reference filter 49. For the measurement object M conveyed by the conveyor 4 and the reference data measurement mode for obtaining the spectral data obtained by spectrally separating the light at the light receiving unit 2 and receiving the spectral light as the reference spectral data. Then, a normal data measurement mode for obtaining measurement spectral data by irradiating light from the light projecting unit 1 and analyzing the internal quality of the measurement object M based on the measurement spectral data and the reference spectral data It is configured to be switchable between.
[0060]
More specifically, in the reference data measurement mode, the vertical position adjustment mechanism 29 switches to the reference measurement state while the conveyance of the measurement object M by the conveyor 4 is stopped. Then, the shutter mechanism 17 is switched to the open state, the light from the light projecting unit 1 is irradiated to the reference filter 49 instead of the measurement object M, and the light transmitted from the reference filter 49 is received by the light receiving unit 2. Spectral data obtained by spectrally receiving and receiving the split light is measured as reference spectral data.
[0061]
In the reference data measurement mode, the detection value (dark current data) of the light receiving sensor 23 in the lightless state where the light to the light receiving unit 2 is blocked is also measured. That is, the shutter mechanism 17 of the light receiving unit 2 is switched to the shielding state, and the detection value for each unit pixel of the light receiving sensor 23 at that time is obtained as dark current data.
[0062]
Next, the control operation in the normal data measurement mode will be described.
In this normal data measurement mode, the vertical position adjusting mechanism 29 is operated to switch the lifting platform 34 to the normal measurement state, and the measurement object M is conveyed by the conveyor 4. Then, based on the detection information by the passage detection sensor 50, the period during which the measurement object passes through the measurement object location is detected, and the charge accumulation operation is performed by receiving the dispersed light in a state synchronized with the period. The operation of the light receiving sensor 23 is controlled so that the charge accumulation process to be executed and the sending process for sending out the accumulated charge are repeated at a set cycle.
That is, as shown in FIG. 11, in the time zone in which each measurement object M is predicted to pass through the measurement target location, the light receiving sensor 23 executes the charge accumulation process for the set time, and the measurement target M is measured at the measurement target location. The operation of the light receiving sensor 23 is performed so as to execute a sending process for sending out the electric charge accumulated for a set time at a timing such that the vicinity of the intermediate position between the respective measurement objects M predicted to be present in the Control. Therefore, this apparatus is configured to operate with the charge accumulation time by the light receiving sensor 23 always being constant. When the processing capability is such that 7 measurement objects pass through every second, the set time T1 for executing the charge accumulation processing is about 140 msec.
[0063]
Then, the operation control means 101 switches the open state from the shield state to the open state in the state where the light receiving sensor 23 performs the charge accumulation process and the light reception sensor 23 performs the charge accumulation process. It is configured to control the operation of the shutter mechanism 17 so as to return to the shielding state after being maintained for a while, and is configured to change and adjust the opening maintaining time Tx based on the change command information.
This open maintenance time Tx is configured to be changed according to the type of measurement object. For example, in the case of Wenzhou mandarin orange, light is relatively easy to transmit, so it is set to a relatively short time (about 10 msec). For Iyokan, it is difficult to transmit light, so a long time (about 30 msec) Set to.
The setting of the operation condition depending on the kind of the product is configured to be manually performed by an operator. That is, as shown in FIG. 10, there is provided a switching operation tool C for artificially switching the setting position according to the type of product, and the setting information of the switching operation tool C is input to the control unit 3, and the control unit 3 According to the setting information, the opening maintenance time Tx is changed and adjusted.
[0064]
Further, the operation control means 101 determines whether the measurement target has reached the measurement target location based on the change in the actual value of the light reception amount detected by the light amount detection sensor 19, that is, the light transmission amount of the measurement target. The shutter mechanism 17 is switched to the open state when it is detected that the measurement object has arrived, and the shutter mechanism 17 is put into the shielded state after maintaining the open state for the open maintaining time Tx. The measurement process is completed by switching.
More specifically, FIG. 11 shows a change state of the detection value of the light amount detection sensor 19 over time. Until the measurement object arrives, the maximum value is output by the light projected from the light projecting unit 1, but when the measurement object M reaches the measurement location, the measurement light is blocked and the light amount detection sensor detects it. When the value (light receiving amount) starts to decrease and the detected value decreases to a preset value or less (t1), it is determined that the measurement object has reached the measurement location, and the set time has elapsed from that point. (T2), the shutter mechanism 17 is switched to the open state. Then, after maintaining the open state for the open maintaining time Tx, the shutter mechanism 17 is switched to the shielding state.
[0065]
In addition, when such a measurement process is being performed, when the conveyor 4 stops abnormally, the shutter mechanism 4 in the light projecting unit 1 is closed and moved to a measurement object that has stopped moving. For a long time, strong light from the light source is prevented from being irradiated.
[0066]
The analysis unit 100 is configured to execute a calculation process for analyzing the internal quality of the measurement object M using a spectroscopic analysis technique that is a known technique based on the various data obtained in this manner. Yes.
That is, the measured spectrum data obtained as described above is normalized using the reference spectrum data obtained in the reference data measurement mode and the dark current data, and is obtained for each wavelength that has been separated. Absorbance spectrum data is obtained, and a second derivative value of the absorbance spectrum data is obtained. And it is comprised so that the analytical calculation process which calculates the component amount corresponding to the sugar content contained in the measuring object M and the component amount corresponding to acidity with the secondary differential value and the preset calibration formula may be performed. ing.
The absorbance spectrum data d is Rd as the reference spectrum data, Sd as the measured spectrum data, and Da as the dark current data.
[0067]
[Expression 1]
d = log {(Rd−Da) / (Sd−Da)}
[0068]
It is calculated by the following formula.
And the control part 3 uses the value of a specific wavelength among the values which carried out the secondary differentiation of the absorbance spectrum data d obtained in this way, and a calibration formula as shown in the following equation 2, A calibration value for calculating the amount of the component corresponding to the sugar content or acidity contained in the product M is obtained.
[0069]
[Expression 2]
Y = K0 + K1 · A (λ1) + K2 · A (λ2)
[0070]
However,
Y: Calibration value corresponding to the component amount
K0, K1, K2; coefficients
A (λ1), A (λ2); second derivative of absorbance spectrum at specific wavelength λ
[0071]
A specific calibration equation, specific coefficients K0, K1, K2, wavelengths λ1, λ2, and the like are preset and stored for each component for which the component amount is calculated. The calibration value (component amount) of each component is calculated using a specific calibration formula.
[0072]
The calibration formula as described above is individually set for each apparatus based on data obtained by actually measuring a sample similar to the measurement target as the measurement target prior to the measurement processing for the measurement target. .
In other words, tens to hundreds of objects to be measured are prepared as the samples, and spectral spectrum data for each wavelength is obtained for each sample using the quality evaluation apparatus H1. Further, for each sample, for example, based on destructive analysis or the like, the actual component amount detection process for accurately detecting the chemical component of the object to be measured by a special inspection device is executed to obtain the actual component amount of the object to be measured. . Then, using the spectral data of each sample obtained as described above, using the method of multiple regression analysis while comparing with the detection result of the actual component amount, the spectral data and the specific component The calibration formula showing the relationship with the component amount is obtained.
[0073]
Next, the measurement object A for calibration of the quality evaluation apparatus for calibrating the quality evaluation apparatus H1 as described above will be described.
When the quality evaluation apparatus H1 is calibrated using the measurement target A for quality evaluation apparatus calibration, calibration is performed with the measurement target A placed on the support base 32, as shown in FIG. To do. The object A to be measured is placed on the support base 32 while being positioned as it is, and is easily detachable. When calibration is not performed, the object A to be measured is detached from the support base 32. I can keep it.
[0074]
The measured object A for calibration of the quality evaluation apparatus is provided with pure water J as a quality evaluation object whose quality is evaluated by the quality evaluation apparatus H1 in a state where the temperature adjustment means holds the pure water J at a set temperature. A storage 51 for storing pure water J as an evaluation target and the temperature adjusting means are integrally assembled in a unit shape. In addition, an outer casing 52 that covers the storage portion 51 in a state in which the air layer K is formed on the outer peripheral portion of the storage portion 51 in which the quality evaluation target is stored is provided, and the temperature adjusting means controls the temperature of the air layer K. Is configured to do.
[0075]
More specifically, as shown in FIG. 12, the outer peripheral portion is covered with a substantially quadrangular prism-shaped outer casing 52 made of a non-translucent member, and one end side in the longitudinal direction inside the outer casing 52. A storage portion 51 for storing pure water J as a quality evaluation target in an enclosed state is provided at a location (location located on the lower side when placed on the support base 32). An air layer K is formed between the two. Then, the other end side in the longitudinal direction of the outer casing 52 (the position positioned on the upper side when placed on the support base 32) is airtight by the partition wall 53 with respect to the storage space in which the storage unit 51 is provided. A partitioned air conditioning space 54 is formed.
[0076]
The partition wall 53 is provided with a Peltier element 55 which is an example of a temperature adjusting means in a state in which a heat transfer action is exerted between the air layer K and the air conditioning space. A fan 56 that blows air in a direction away from the surface of the Peltier element 55 is provided on the surface of the Peltier element 55 on the air layer K side, and a control circuit 57 for operating the Peltier element 55 and a fan are provided in the air conditioning space 54. The drive circuit 58 for driving 56, the power supply device 59, etc. are provided. The control circuit 57 sets the temperature of the air layer K detected by a temperature sensor (not shown) at a set temperature (30 ° C.) that is the temperature of the measurement object or a temperature close thereto when the quality is evaluated by the quality evaluation device. Thus, the Peltier element 55 is controlled so as to be maintained. As a result, since the temperature of the air layer K is maintained at the set temperature, the pure water J stored in the storage unit 51 is always held at the set temperature. A flat plate 60 is provided to receive the air blown by the fan 56 so that it does not directly hit the storage portion 51 and to make the temperature in the air layer K as uniform as possible.
[0077]
As shown in FIG. 13, the temperature-adjusted air sent out by the fan 56 is received by the leveling plate 60, and is gently guided along the periphery of the storage portion 51 without directly hitting the storage portion 51. The temperature is controlled so that the entire air layer K reaches the set temperature almost uniformly.
[0078]
And the light passage part 61 and the light passage part 62 are each formed in the position corresponding to the right-and-left both sides location of the accommodating part 51 in the outer side casing 52. As shown in FIG. That is, a through hole is formed at a position corresponding to the light incident side light passage portion 61 and the light emission side light passage portion 62 of the outer casing 52 made of a non-light-transmissive member, and the opal glass G as a diffuser. Is mounted in an airtight state.
[0079]
A calibration method for calibrating the quality evaluation apparatus H1 using the measurement target A for calibration of the quality evaluation apparatus configured as described above will be described below.
That is, when the quality evaluation apparatus H1 is calibrated using the measurement object A for calibration of the quality evaluation apparatus, first, as described above, when the calibration formula is created prior to the measurement process for the measurement object. , The light receiving information of the light transmitted through the quality evaluation target in the measurement target A for calibration of the quality evaluation apparatus, that is, the quality of the quality evaluation target (pure water) based on the spectral spectrum data and the calibration formula. A standard calibration value is measured.
[0080]
FIG. 14 shows measurement data obtained by the present applicant. Of these lines, line L1 indicates the second derivative spectrum data of the spectral spectrum data of the light transmitted through the pure water, and line L2 indicates the second derivative spectrum of the spectral spectrum data of the light transmitted through the apple as an example of fruit vegetables. Data are shown. From this figure, it is clear that pure water has light absorption characteristics similar to fruit vegetables.
[0081]
Thereafter, after the measurement process is performed on the measurement object, the light reception information (spectral spectrum) of the light transmitted through the quality evaluation object in the measurement target A for quality evaluation apparatus calibration at the time of the apparatus calibration for calibrating the quality evaluation apparatus H1. Based on the data) and the calibration formula, a calibration calibration value corresponding to the quality of the quality evaluation target (pure water) is measured.
When the quality evaluation device H1 evaluates the quality of the measurement object, a calibration value corresponding to the quality of the measurement object obtained based on the light reception information of the light transmitted through the measurement object and the calibration equation is calibrated. The correction is made based on the difference between the standard calibration value and the standard calibration value.
[0082]
Specifically, such calibration processing is performed by the control unit 3. If a description is added, the control part 3 will perform the following processes. In other words, the operation control means 101 is configured to be able to switch to the calibration data measurement mode in addition to the reference data measurement mode and the normal data measurement mode as described above.
When the calibration formula is created as described above, the measurement target A for quality evaluation apparatus calibration is manually placed on the support base 32, and the operation control means 101 switches to the calibration data measurement mode. Then, by vertically moving and adjusting the light projecting unit 1 and the light receiving unit 2 by the vertical position adjusting mechanism 29, the light from the light projecting unit 1 is calibrated as a quality evaluation apparatus as shown in FIGS. Is switched to a calibration measurement state in which light is received by the light receiving unit 2 after passing through a quality evaluation target (pure water) in the measurement object A. Then, the light from the light projecting unit 1 is guided to the quality evaluation target (pure water) through the light passing unit 61, and the light transmitted through the quality evaluation target (pure water) is passed to the external light receiving unit 2 through the light passing unit 62. Based on the light reception information (spectral spectrum data) of the light received by the light receiving unit 2 and the calibration formula, the reference calibration value α corresponding to the quality of the quality evaluation target (pure water) is measured and stored.
Therefore, in this embodiment, the light passing part 61 functions as an incident-side light passing part IP that diffuses measurement light and guides it to the quality evaluation target, and the light passing part 62 passes through the quality evaluation target. Will function as a transmission light output side light passage portion OP1 that guides the light to the outside along the direction in which the measurement light is projected.
[0083]
After that, the mode is switched to the normal data measurement mode, and the vertical position adjusting mechanism 29 integrally adjusts the light projecting unit 1 and the light receiving unit 2 so as to switch to the normal measurement state as shown in FIG. A measurement process for the object is performed.
[0084]
When the apparatus for calibrating the quality evaluation apparatus H1 is switched to the calibration data measurement mode, the vertical position adjustment mechanism 29 adjusts the light projecting unit 1 and the light receiving unit 2 up and down integrally for calibration. Based on the light reception information (spectral spectrum data) of light that has passed through pure water as the quality evaluation target in the measurement target A for calibration of the quality evaluation apparatus and the calibration formula, the quality evaluation target (pure The calibration calibration value β corresponding to the quality of water is measured and stored.
[0085]
When the quality evaluation device H1 evaluates the quality of the measurement object after the calibration measurement is completed, the vertical position adjustment mechanism 29 switches to the normal measurement state and transmits the measurement object as described above. The calibration value Y corresponding to the quality of the measurement object obtained on the basis of the received light reception information and the calibration equation is measured, and the calibration value Y obtained at that time is corrected by the following equation (3). The corrected calibration value Ys is obtained. The corrected calibration value Ys corresponds to the quality of the final measurement object. However, K3 in Equation 3 is a predetermined coefficient.
In the initial stage of installation of the quality evaluation apparatus H1, when the calibration calibration value β is not measured, the calibration calibration value β is substituted with the same value as the reference calibration value α, and the measured calibration value The value Y directly corresponds to the quality of the final measurement object.
[0086]
[Equation 3]
Ys = Y + K3 · (α-β)
[0087]
Even when the calibration value measured in this way due to aging of the apparatus deviates from the actual fruit and vegetable quality (acidity and sugar content), the measurement of the measurement object A for calibration of the quality evaluation apparatus Based on the difference between the calibration calibration value based on the result and the reference calibration value, the above-described deviation can be corrected and corrected to an appropriate calibration value.
[0088]
[Second Embodiment]
Next, a description will be given of a second embodiment of an object A for calibration of a quality evaluation apparatus according to the present invention and a quality evaluation apparatus calibration method using the same.
[0089]
First, the configuration of the quality evaluation apparatus H2 to be calibrated in this embodiment will be described. This quality evaluation apparatus H2 is an apparatus for measuring sugar content and acidity as quality for fruits and vegetables such as peaches and pears, for example. Since the configuration of the light passage path to the unit 2 and the configuration of the transport conveyor 4a are the same as those in the first embodiment, only the different configuration will be described, and the description of the same configuration will be omitted. The light projecting unit 1 and the light receiving unit 2 are each configured to be assembled in a unit shape, and share the same configuration as that used in the quality evaluation apparatus H1 in the first embodiment. .
[0090]
This quality evaluation apparatus H2 is configured as a transflective type quality evaluation apparatus, and as shown in FIGS. 15 and 17, a unit having the same configuration as the light projecting unit 1 in the quality evaluation apparatus H1 in the first embodiment. Two sets of light projecting sections 1 are provided, and the two sets of light projecting sections 1 are distributed and arranged on the left and right sides of the measurement target portion, that is, on both sides of the transport conveyor 4a in the transport width direction. It has become. Each light projecting unit 1 is mounted in such a posture that the light irradiation direction is substantially horizontal. The transport conveyor 4a is configured to transport a measurement object in a state of being placed on a receiving tray 71 having an insertion hole 70 formed in the central portion. The light projecting unit 1 is disposed below the measurement target portion. The light receiving side end portion of the optical fiber 72 that receives the light irradiated through the measuring object and transmitted through the insertion hole 70 of the tray 71 downward is disposed. The other end side of the optical fiber 72 is provided with a unit-shaped light receiving unit 2 having the same configuration as the light receiving unit 2 in the quality evaluation apparatus H1 in the first embodiment.
The internal quality analysis processing by the control unit 3 based on the light reception information by the light receiving unit 2 is the same as in the case of the first embodiment.
[0091]
Next, the measurement target A for calibration of the quality evaluation apparatus used for the quality evaluation apparatus H2 will be described. The measured object A for calibration of the quality evaluation apparatus in this embodiment is the same as that of the first embodiment except for the configuration of the light passage path, so only the differences will be described, and the same configuration will not be described. Omitted.
[0092]
As shown in FIG. 18, the measurement object A diffuses the measurement light projected from the light projecting unit 1 and guides it to a quality evaluation target (pure water J), and the light passing unit 73. And a light passage portion 74 that guides light that has passed through the quality evaluation target and guided to the outside along a direction orthogonal to the direction in which the measurement light is projected. That is, the light passage portions 73 are formed on both the left and right sides and the light passage portions 74 are formed on the lower side in correspondence with the left and right light projecting portions 1, respectively. A passage hole is formed at a position corresponding to 73 and the light passage portion 74, and the opal glass G as a diffuser is mounted in an airtight state. In this embodiment, the light passage portion 73 functions as an incident light passage portion, and the light passage portion 74 functions as an outgoing light passage portion.
[0093]
When the quality evaluation apparatus H2 is calibrated using the measurement object A, the measurement object A is placed on the support base 32 of the quality evaluation apparatus and calibrated by the same calibration method as in the first embodiment. As shown in FIGS. 16 and 17, when the reference calibration value α and the calibration calibration value β are measured by switching to the calibration measurement state as described above by the vertical position adjustment mechanism 29, The measurement light projected from the right and left light projecting parts 1 is guided to the quality evaluation target (pure water J) through the light passing parts 73 on the left and right sides, and the light transmitted therethrough is formed on the lower side. Light is received at the light receiving side end of the optical fiber 72 through the light passing portion 74 and the insertion hole 70 of the tray 71, and is received by the light receiving portion 2 through the optical fiber 72, and the received light information is measured. At that time, the light that has passed through the lower light passing portion 74 passes through the reference filter 49 in the vertical direction, but the reference filter 49 is transparent glass on both the upper and lower sides, and the light passes through as it is. It is the composition to do.
[0094]
The measurement target A for calibration of the quality evaluation apparatus in this embodiment is for measurement in which each of the light passage portions 73 formed on the left and right sides of the storage portion 51 in which the quality evaluation target is stored is projected from the light projecting portion 1. Functions as a light incident side light passage part IP that diffuses light and guides it to a quality evaluation target (pure water), and a light passage part 74 formed on the lower side of the storage part 51 is used for measuring the light that has passed through the quality evaluation target While functioning as a semi-transmission light-emitting side light passage portion OP2 that guides the light along the direction orthogonal to the direction in which the light is projected, the measurement target A for quality evaluation apparatus calibration in the embodiment is It can also be used for the transmission type quality evaluation apparatus described in the first embodiment, and when applied to the transmission type quality evaluation apparatus H1, the light passage portions 73 formed on both the left and right sides. Is one of the light incident side light passing parts IP. And functioning, the other one becomes to function as a light outgoing side light passing portion OP1 for transmission that leads to the outside along a direction of light that has passed through the quality evaluation said measuring light is projected. At that time, the light passage part formed on the lower side of the storage part 51 is closed.
[0095]
Therefore, the measurement object A for calibration of the quality evaluation apparatus is, as the light exit side light passage part OP, the direction in which the measurement light is projected on the light guided through the light entrance side light passage part IP and passed through the quality evaluation target. A light output side light passing part OP1 for transmission guided to the outside along the light source, and a light guided through the quality evaluation target guided through the input side light pass part along the direction orthogonal to the direction in which the measurement light is projected. And a semi-transmission quality evaluation apparatus H1 and a semi-transmission quality evaluation apparatus H2 can be used together.
[0096]
[Another embodiment]
Hereinafter, other embodiments are listed.
[0098]
(1In each of the above embodiments, pure water as a quality evaluation object whose quality is evaluated by the quality evaluation device is provided in a state of being held at a set temperature by a temperature adjusting means. Instead of using the temperature of the measurement object when the quality is evaluated by the quality evaluation apparatus as in the form, or a temperature close thereto, the temperature may be set to a temperature different from such a temperature.
[0099]
(2In each of the above embodiments, an outer casing is provided that covers the storage portion in a state where an air layer is formed on the outer peripheral portion of the storage portion in which the quality evaluation target is stored, and the temperature adjusting means is provided for the air layer. However, in place of such a configuration, the temperature control may be performed by directly acting on the quality evaluation target stored in the storage unit. Good.
[0100]
(3In each of the above embodiments, the storage unit in which the quality evaluation target is stored and the temperature adjusting unit are integrally assembled in a unit shape, but the quality evaluation target is stored. The storage unit and the temperature adjustment means are integrated into a unit shape, and are stored separately in a separate state. When calibration is performed, quality evaluation is performed using the temperature adjustment means. The adjustment process may be performed so that the target temperature becomes the set temperature.
[0101]
(4In each of the above embodiments, a Peltier element is used as the temperature adjusting means. Instead, for example, a heat pump type air conditioner or the like may be used.
[0102]
(5In each of the above embodiments, the temperature adjustment means for holding the pure water as the quality evaluation target at the set temperature is provided. However, such a temperature adjustment means may not be provided. In that case, in order to reduce a measurement error due to a temperature change, a temperature measuring unit for measuring the temperature of the pure water is provided, and the information on the temperature of the pure water is added as measurement information for calibration. It may be.
  Specifically, when measuring the reference calibration value α in each of the above embodiments, the temperature of the pure water is changed by a set unit temperature to measure the reference calibration value α at each temperature, and the temperature at that time Map data is stored together with the above information. When the calibration value β for calibration is measured at the time of calibration of the device, the temperature of pure water at that time is measured based on the measurement result of the temperature measuring means, and data obtained by converting those data to the same temperature is newly added. The calibration value corresponding to the quality of the measurement object may be corrected based on the difference between the standard calibration value α and the calibration calibration value β.
[0103]
As a specific configuration at that time, for example, as shown in FIG. 19, pure water J is sealed in a storage unit 80 that allows light to pass only at the entrance and exit of the measurement light. It is good also as a structure provided with the opal glass G as a light diffuser in the entrance part 81 and the exit part 82, respectively, and the water temperature meter 83 as a temperature measurement means which measures the temperature of the pure water J in the accommodating part 80.
[0104]
(6In each of the above embodiments, as the light exit side light passage unit, the light guided through the light entrance side light passage unit and passed through the quality evaluation target is guided to the outside along the direction in which the measurement light is projected. A light outgoing side light passage part for transmission and a semi-transmission part that guides the light that has been guided through the input side light passage part and passed through the quality evaluation target to the outside along a direction orthogonal to the direction in which the measurement light is projected. However, the present invention is not limited to such a configuration, and may be configured to include only a transmission light-side light passage portion for transmission, or a semi-transmission portion. It is good also as a structure provided only with the light emission side light passage part.
[0105]
(7) In each of the above embodiments, the storage portion for storing pure water is formed of a light-transmitting member, and the light incident side light passage portion and the light exit side light passage portion are formed in the outer casing, Although the configuration in which the opal glass G is provided has been illustrated, instead of such a configuration, the housing portion is made of a material having light transmittance such as ground glass and having a light diffusing function. It is good also as a structure which is not provided.
[Brief description of the drawings]
FIG. 1 is a front view of a transmission type quality evaluation apparatus.
FIG. 2 is a front view of a transmission type quality evaluation apparatus.
FIG. 3 is a longitudinal front view of the main part of a transmission type quality evaluation apparatus in a calibration measurement state.
FIG. 4 is a cross-sectional plan view of a transmission type quality evaluation apparatus.
FIG. 5 is a block diagram of the spectrometer.
FIG. 6 shows a shutter mechanism.
FIG. 7 is a cutaway plan view of a light projecting unit.
FIG. 8 is a plan view showing an installation state.
FIG. 9 Timing chart of measurement operation
FIG. 10 is a control block diagram.
FIG. 11 is a diagram showing a change in received light amount and measurement timing.
FIG. 12 is a cutaway front view of an object to be measured for calibration of a quality evaluation apparatus.
FIG. 13 is a partially cutaway side view of an object to be measured for calibration of a quality evaluation apparatus.
FIG. 14 is a diagram showing spectral data.
FIG. 15 is a front view of a transflective quality evaluation apparatus.
FIG. 16 is a front view of a transflective quality evaluation apparatus.
FIG. 17 is a longitudinal front view of the main part in a calibration measurement state of a transflective type quality evaluation apparatus.
FIG. 18 is a sectional view of an object to be measured for calibration of a quality evaluation apparatus according to a second embodiment.
FIG. 19 is a sectional view of an object to be measured for calibration of a quality evaluation apparatus according to another embodiment.
[Explanation of symbols]
51 storage
52 Outer casing
55 Temperature adjustment means
83 Temperature measurement means
H1, H2 quality evaluation equipment
J pure water
IP light entrance side
OP Light exit side light passage

Claims (8)

Quality is measured by a quality evaluation device that projects measurement light including a wavelength for quality evaluation onto fruit vegetables as a measurement object, and evaluates the quality of the measurement object from light reception information of light transmitted through the measurement object. A quality evaluation apparatus calibration method for calibrating the quality evaluation apparatus using a measurement object for quality evaluation apparatus calibration to be evaluated ,
The measurement object for calibration of the quality evaluation apparatus includes pure water as a quality evaluation object whose quality is evaluated by the quality evaluation apparatus ,
The quality in the measurement object for calibration of the quality evaluation device at the time of calibration formula creation for creating a calibration formula for obtaining a calibration value corresponding to the quality of the measurement target object from light reception information of light transmitted through the measurement target object Based on the light reception information of the light transmitted through the evaluation target and the calibration formula, measure a reference calibration value corresponding to the quality of the quality evaluation target,
At the time of device calibration for calibrating the quality evaluation device, based on the light reception information of the light transmitted through the quality evaluation target in the measurement target for quality evaluation device calibration and the calibration formula, the quality of the quality evaluation target is adjusted. Measure the corresponding calibration calibration value,
When evaluating the quality of the measurement object by the quality evaluation device, a calibration value corresponding to the quality of the measurement object obtained based on the received light information of the light transmitted through the measurement object and the calibration equation, A quality evaluation apparatus calibration method for correcting based on a difference between the calibration calibration value and the reference calibration value. The quality evaluation apparatus calibration method according to claim 1 , wherein the measurement target for calibration of the quality evaluation apparatus includes a temperature measurement unit that measures the temperature of the pure water . The quality evaluation apparatus calibration method according to claim 1 , wherein the measurement object for calibration of the quality evaluation apparatus is provided with a quality evaluation object whose quality is evaluated by the quality evaluation apparatus being held at a set temperature by a temperature adjusting unit. . The quality evaluation apparatus according to claim 3 , wherein the measurement target for calibration of the quality evaluation apparatus is configured such that a storage unit in which the quality evaluation target is stored and the temperature adjustment unit are integrally assembled in a unit shape. Calibration method. The measurement target for calibration of the quality evaluation apparatus is configured to diffuse the measurement light and guide the light to the quality evaluation target, and the light exit side that diffuses the light passing through the quality evaluation target and guides the light to the outside. The quality evaluation apparatus calibration method according to claim 1, comprising a light passage section . The object to be measured for calibration of the quality evaluation apparatus is the light-emitting side light passing part.
A light exiting side light passing part for transmission that guides light that has been guided through the light entrance side light passing part and passed through the quality evaluation target to the outside along a direction in which the measuring light is projected, and the input side light passing And a semi-transmission light-emitting side light passage section that guides light that has been guided through the section and passed through the quality evaluation target to the outside along a direction orthogonal to the direction in which the measurement light is projected. The quality evaluation apparatus calibration method according to claim 5 . The measurement object for calibration of the quality evaluation apparatus includes an outer casing that covers the storage portion in a state where an air layer is formed on an outer peripheral portion of the storage portion in which the quality evaluation target is stored, and the temperature adjusting means is the The quality evaluation apparatus calibration method according to claim 4, wherein the temperature evaluation is performed on the air layer. The measurement object for calibration of the quality evaluation apparatus is configured such that the storage portion is configured by a member having translucency, the outer casing is configured by a non-translucent member, and the measurement light is diffused and the quality is measured. The quality evaluation apparatus calibration method according to claim 7, wherein a light incident side light passage portion that leads to an evaluation target and a light emission side light passage portion that diffuses light that has passed through the quality evaluation target and guides the light to the outside are formed.

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