JP2004163369A - Matter to be measured for calibrating quality evaluation system, and method for calibrating quality evaluation system using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a matter to be measured for calibrating a quality evaluation system, which reduces the labor hours for works in the case of calibrating the quality evaluation system and improves the efficiency of the work. <P>SOLUTION: The quality evaluation system makes vegetable fruits being objects to be measured irradiated with a measuring light, having wavelength values for evaluating their quality and evaluates the quality of the objects to be measured, based on information of received light which passes through the objects to be measured. The matter to be measured for calibrating the quality evaluation system includes deionized water J as an object of quality evaluation whose quality is evaluated by the quality evaluation system. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention projects a measurement light including a wavelength for quality evaluation on fruits and vegetables as a measurement target, and evaluates the quality of the measurement target from light reception information of light transmitted through the measurement target. The present invention relates to a measurement object for calibrating a quality evaluation device whose quality is evaluated by an evaluation device, and a method for calibrating a quality evaluation device using the same.
[0002]
[Prior art]
Conventionally, as a measurement object for quality evaluation device calibration of the above configuration, in the case where the quality evaluation device to be calibrated measures the sugar content or acidity of fruit and vegetables such as tangerine or peach as a measurement target, the There has been a configuration in which an aqueous solution having the same quality as that of fruits and vegetables, for example, the quality of acidity and sugar content is provided as a quality evaluation target. Specifically, a 1% aqueous solution of citric acid as an object of quality evaluation having the same acidity as fruits and vegetables is stored in a light-transmissive container, and the temperature of the aqueous solution of citric acid is further increased. It had the structure provided with the temperature measuring body 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 evaluating the quality of fruits and vegetables.
In addition, when the temperature of the aqueous solution changes, the light absorption characteristics with respect to the wavelength for quality evaluation as described above fluctuate. Therefore, when evaluating the quality of the measurement object for calibration of this quality evaluation device with the quality evaluation device, the evaluation is performed. The temperature of the aqueous solution is measured by the temperature measuring element in association with the result (see Patent Document 1).
[0003]
In addition, as a method for calibrating a quality evaluation device using such a measurement object for calibration of a quality evaluation device, the quality of the measurement object for calibration of the quality evaluation device is evaluated by a quality evaluation device to be calibrated. The result is stored as a reference value, and when the quality evaluation device is calibrated, the quality of the object to be measured for quality evaluation device calibration is again evaluated by the quality evaluation device, and the evaluation result is compared with the reference value. A method of calibrating the quality evaluation device based on the difference can be considered.
By the way, in the object to be calibrated for the quality evaluation device as described above, if the temperature changes, the quality to be measured by the quality evaluation device fluctuates. It is preferable to measure the temperature of the quality evaluation target by a temperature measuring means such as a temperature measuring body.
[0004]
[Patent Document 1]
JP-A-2000-199743 (page 16, FIGS. 4, 5, and 7)
[0005]
[Problems to be solved by the invention]
In the measurement object for calibration of the conventional quality evaluation device, the aqueous solution having the same light absorption characteristics as the light absorption characteristics for the wavelength for the quality evaluation of fruits and vegetables is used as the quality evaluation target. When manufacturing a measurement object for calibration of an evaluation device, there is a disadvantage in that the concentration of the aqueous solution must be adjusted to an appropriate concentration so as to correspond to the quality of the measurement object, which is troublesome and troublesome. In the case where a plurality of kinds of fruits and vegetables are targeted, it is necessary to prepare aqueous solutions having different quality for each of the different types of measurement targets, which is disadvantageous in that it is troublesome. In addition, the aqueous solution prepared as described above may change from the initially adjusted concentration over time due to evaporation of water, aging, and the like, and the quality of the measurement object for calibration of the quality evaluation device may be changed to the initial state. The disadvantage is that it cannot be maintained.
[0006]
The present invention has been made in view of such a point, the object is to provide a measurement object for quality evaluation device calibration that can minimize the work of calibrating the quality evaluation device, It is an object of the present invention to provide a method for calibrating a quality evaluation device using such an object to be calibrated for the quality evaluation device.
[0007]
[Means for Solving the Problems]
The measuring object for calibration of the quality evaluation device according to claim 1, the measuring light including the wavelength for quality evaluation is projected on fruits and vegetables as the measuring object, and the light transmitted through the measuring object. The quality is evaluated by a quality evaluation device that evaluates the quality of the measurement target from the received light information, and includes pure water as a quality evaluation target whose quality is evaluated by the quality evaluation device. I do.
[0008]
That is, since pure water is provided as a quality evaluation target whose quality is evaluated by the quality evaluation device, when the quality evaluation device is calibrated using the measurement object for quality evaluation device calibration, the quality evaluation device is The measurement result is obtained by projecting the measurement light including the wavelength for quality evaluation to the water and evaluating the quality of the pure water from the received light information of the light transmitted through the pure water. The quality evaluation device is calibrated based on the measured results.
[0009]
In addition, for example, tangerine, which is an example of fruit and vegetables, has about 90% water, and fruit and vegetables are rich in moisture as represented by the tangerine. Light receiving information of light transmitted by projecting measurement light including a wavelength for quality evaluation by a quality evaluation device for fruits and vegetables containing a large amount of water in this manner, such as light absorption characteristics at the wavelength for quality evaluation, etc. The characteristics are almost the same as water, and by using water as a quality evaluation target, light-receiving information having light absorption characteristics at a wavelength for quality evaluation substantially similar to fruits and vegetables can be obtained. .
[0010]
Then, in the case of evaluating the quality of the acidity or the sugar content as the quality of the fruits and vegetables, first, before the quality evaluation of the measurement target is performed by the quality evaluation device, the quality evaluation device is used for calibrating the quality evaluation device. The quality of the object to be measured 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 where the acidity or the sugar content is zero.
Also, when performing the calibration process on the quality evaluation device, the quality evaluation device again evaluates the quality of the object to be measured for the calibration of the quality evaluation device, and measures the evaluation result for the calibration. The initial state, i.e., if the acidity or sugar content is different from the evaluation result corresponding to the state of 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. This makes it possible to calibrate the quality evaluation device.
Furthermore, unlike pure water, which 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 caused by impurities, and quality can be easily maintained in the initial state. It becomes.
[0011]
Therefore, it has become possible to provide an object to be measured for calibrating the quality evaluation device, which can minimize the labor for calibrating the quality evaluation device.
[0012]
According to a second aspect of the present invention, there is provided a measurement object for calibration of the quality evaluation device, wherein the measurement object is configured to include a temperature measuring unit for measuring a temperature of the pure water.
[0013]
In other words, even when pure water is used as the quality evaluation target, the quality of the quality evaluation target, particularly the light absorption characteristics of light of the wavelength for quality evaluation, may change due to a change in temperature. The temperature of the pure water when the quality of the pure water is evaluated by the evaluation device is measured by the temperature measuring means, so that the quality evaluation device can be properly calibrated based on the measurement information.
[0014]
In addition, when the quality evaluation device evaluates the quality of the measurement object for calibration by the quality evaluation device and sets the evaluation result in the initial state as a reference value, for example, the temperature of pure water as a quality evaluation target is When a plurality of reference values when variously changed and a correlation of a change in the reference value with respect to a temperature change when the temperature of pure water is changed are obtained and stored, when calibrating the quality evaluation device, When the quality evaluation device evaluates the quality of the object to be measured and obtains the evaluation result, the temperature measuring means measures the temperature of pure water as a quality evaluation target, and the evaluation result and the temperature at that time are measured. By correcting the evaluation result of the quality evaluation device to an appropriate value while comparing the reference value with the corresponding temperature, the calibration of the quality evaluation device can be appropriately performed.
[0015]
The object to be measured for calibration of the quality evaluation device according to claim 3 projects light for measurement including a wavelength for quality evaluation on fruits and vegetables as the object to be measured, and outputs light transmitted through the object to be measured. The quality is evaluated by a quality evaluation device that evaluates the quality of the measurement target from the received light information, and the quality evaluation target whose quality is evaluated by the quality evaluation device is held at a set temperature by a temperature adjustment unit. It is characterized by having.
[0016]
That is, since the quality evaluation target whose quality is to be evaluated by the quality evaluation device is provided so as to be maintained at the set temperature by the temperature adjusting means, the quality evaluation target is always maintained at the set temperature. In other words, the quality evaluation target is held at the set temperature even when the quality of the object to be measured for the calibration of the quality evaluation device is evaluated by the quality evaluation device and the evaluation result in the initial state is set as the reference value. Since the quality evaluation device is calibrated by the quality evaluation device to calibrate the evaluation device and the quality evaluation target is maintained at the set temperature even when the evaluation result for calibration is obtained by evaluating the quality of the object to be measured. In addition, the quality can be evaluated in a state where there is no measurement error due to a change in quality due to a temperature change of the quality evaluation target regardless of a change in external temperature.
[0017]
In this way, since the evaluation result in the initial state and the evaluation result for calibration correspond to the measurement result at the same temperature, it is possible to calibrate the device properly with little measurement error due to temperature change Therefore, when evaluating the quality of the object to be measured for quality evaluation device calibration by the quality evaluation device, the troublesome work of measuring the temperature of the quality evaluation target and compensating the measurement result in response to the temperature fluctuation are not required. Not required.
[0018]
In particular, if pure water is provided as a quality evaluation target, there is no change in quality due to aging caused by impurities since pure water does not contain impurities other than water, and the temperature change as described above. In addition to a small measurement error, there is also little change in quality due to aging, so that the apparatus can be calibrated in an appropriate state with a smaller error.
[0019]
Therefore, it has become possible to provide a measurement object for quality evaluation device calibration, which can reduce the labor for calibrating the quality evaluation device.
[0020]
According to a fourth aspect of the present invention, there is provided a measurement object for calibration of the quality evaluation device, wherein the storage unit in which the quality evaluation target is stored and the temperature adjustment unit are integrally assembled in a unit shape. It is characterized by having.
[0021]
That is, since the storage section in which the quality evaluation target is stored and the temperature adjusting means are integrally assembled in a unit, the quality evaluation target is always set to the set temperature even in a non-use state in which the quality evaluation device is not calibrated. Will be held. Therefore, in order to perform calibration from a state where the quality evaluation device is installed at a location different from the installation location, the measurement object to which the quality evaluation device is calibrated is projected by the quality evaluation device. Even if it is set at the target position, the quality evaluation target is always kept at the set temperature by the temperature adjustment means that is integrated, so it is necessary to calibrate in this state where the temperature is accurately controlled. Measurement processing can be performed.
[0022]
For example, if the storage section in which the quality evaluation target is stored and the temperature adjusting means are stored separately from each other, the quality evaluation target always changes according to a change in ambient temperature at that time. In other words, in order to perform calibration, when the measurement target for calibration of the quality evaluation device is set at a measurement target position in the quality evaluation device, the quality adjustment target is set to the set temperature by using the temperature adjusting means. Although there is a disadvantage that a troublesome work for adjusting the temperature is required, according to the above configuration, since the quality evaluation target is always kept at the set temperature, such a troublesome work is unnecessary and the work efficiency is improved. Can be.
[0023]
The object to be measured for calibration of the quality evaluation device according to claim 5 is the temperature according to claim 3 or 4, wherein the set temperature is the temperature of the measurement object when the quality is evaluated by the quality evaluation device or a temperature close thereto. It is characterized by being.
[0024]
That is, since the temperature of the quality evaluation target in the measurement target for calibration of the quality evaluation device is the temperature of the measurement target when the quality is evaluated by the quality evaluation device or a temperature close thereto, the temperature of the actual measurement target is Since the calibration is performed based on the data measured at a temperature close to the temperature, the quality caused by the temperature difference between the actual temperature of the object to be measured and the temperature of the quality It is possible to calibrate the quality evaluation device by minimizing the error of the evaluation result of the above. In addition, the temperature of the object to be measured or a temperature close thereto is a temperature close to the outside air temperature, and if the temperature is adjusted to such a temperature close to the outside air temperature, the amount of energy consumption for adjusting the temperature can be reduced. There are benefits too.
[0025]
According to a sixth aspect of the present invention, there is provided a measurement object for calibration of the quality evaluation device, wherein pure water is provided as the quality evaluation target in any one of the third to fifth aspects.
[0026]
That is, since pure water is provided as a quality evaluation target whose quality is evaluated by the quality evaluation device, the same operation and effect as those described in claim 1 can be obtained, and the description is omitted here.
[0027]
An object to be measured for calibration of a quality evaluation device according to claim 7, according to any one of claims 1 to 6, wherein the light-incident-side light passing unit that diffuses the measurement light and guides the measurement light to the quality evaluation target and the quality evaluation. A light-emission-side light-passing portion for diffusing light that has passed through the object and guiding the light to the outside is provided.
[0028]
In other words, when calibrating a quality evaluation device using an object to be calibrated for a quality evaluation device, the quality evaluation device projects measurement light including a wavelength for quality evaluation on the quality evaluation target, and The measurement result is obtained as the one that evaluates the quality of the quality evaluation target from the light reception information of the light transmitted through the evaluation target, and the quality evaluation device is calibrated based on the obtained measurement result. The light is diffused through the light-incident side light passage section and guided to the quality evaluation target, and the light transmitted through the quality evaluation target is diffused through the light exit side light passage section and guided to the outside.
[0029]
As described above, since the light-entering side light passing portion and the light-emitting side light passing portion are provided respectively, it is not necessary to have a function of diffusing light to the quality evaluation target itself, and the light is diffused in the same manner as light transmitted through fruit vegetables. Although it is possible to properly calibrate the quality evaluation device based on the received light information, as a quality evaluation target, a substance that does not have a light diffusion function but has the same light absorption characteristics as fruits and vegetables, For example, it is possible to use a simple device such as pure water.
[0030]
The object to be measured for calibration of the quality evaluation device according to claim 8 is the light emission side light passage unit according to claim 7, wherein the light guided through the light entrance side light passage unit and passed through the quality evaluation target is the light exit side light passage unit. The transmission light output side light passing portion that guides the measurement light to the outside along the projected direction, and the measurement light is projected through the light that has been guided through the input side light passage portion and passed through the quality evaluation target. And a light-transmitting-side light-passing portion for semi-transmission for guiding to the outside along a direction perpendicular to the direction in which the light exits.
[0031]
That is, of the light guided to the quality evaluation target through the light entrance side light passing portion and passing through the quality evaluation target, the light transmitted along the direction in which the measurement light is projected is the transmission light output side light passing portion. Through to the outside. Further, of the light that has passed through the quality evaluation target, the light that has been transmitted along the direction orthogonal to the direction in which the measurement light is projected can be guided to the outside through the semi-transmission light-emitting side light passing portion.
[0032]
In other words, as a quality evaluation device, a transmissive type in which a light projecting unit that projects measurement light and a light receiving unit that receives light transmitted through the measurement target are distributed to the left and right sides of the measurement target where the measurement target is located With the quality evaluation device described above, a measurement result can be obtained as a device for evaluating the quality of the quality evaluation target based on the light guided to the outside from the light-emitting side light transmitting portion for transmission as described above.
Then, as a quality evaluation device, light-emitting units that project light for measurement are arranged on both left and right sides of the measurement target location where the measurement target is located, and a light receiving unit that receives light transmitted through the measurement target is If it is a semi-transmission type quality evaluation device arranged on the lower or upper side of the measurement object, the quality evaluation target is based on the light guided to the outside from the light transmission side light passing part for semi-transmission as described above. The measurement result can be obtained as an evaluation of the quality.
[0033]
Therefore, any of the transmission type quality evaluation device and the semi-transmission type quality evaluation device can perform calibration using the measured object for calibration of the quality evaluation device.
[0034]
The measuring object for calibration of a quality evaluation device according to claim 9 is the storage unit according to any one of claims 3 to 8, wherein an air layer is formed on an outer peripheral portion of the storage unit in which the quality evaluation target is stored. And an outer casing that covers the air layer, and wherein the temperature adjusting means is configured to control the temperature of the air layer.
[0035]
That is, an air layer is formed on the outer peripheral portion of the storage section in which the quality evaluation target is stored by the outer casing, and the quality adjustment target is indirectly set by the temperature adjusting means performing temperature control on the air layer. It will be kept at the temperature. In this way, the temperature adjustment means does not directly act on the storage section in which the quality evaluation target is stored to adjust the temperature, but indirectly adjusts the temperature through the air space, so that the quality evaluation target is stored. Since there is no temperature adjustment member in the storage section, there is no disadvantage such as deterioration of the quality evaluation target characteristics due to corrosion or chemical change of such temperature adjustment member, and good characteristics are obtained. It is easy to maintain for a long time.
[0036]
According to a tenth aspect of the present invention, in the measurement object for calibration of the quality evaluation device, the storage unit is formed of a member having a light-transmitting property, and the outer casing is formed of a non-light-transmitting member. A writing light side light passing portion and a light emitting side light passing portion are formed.
[0037]
That is, since the outer casing is formed of a non-light-transmitting member, the light-entering-side light passing portion and the light-emitting-side light passing portion are formed, and the housing portion is formed of a light-transmitting member. The measurement light is diffused through the light incident side light passage portion formed in the outer casing, and is guided to the quality evaluation object through the light-transmitting storage portion. Then, the light passing through the quality evaluation target passes through the light-transmissive storage portion, is diffused through the light-emission-side light passage portion formed in the outer casing, and is guided to the outside.
[0038]
Therefore, after the state where 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 parts other than the part where the measurement light passes are formed by non-translucent members. Since the passage of light is blocked, errors due to disturbance can be reduced, and light receiving information for calibration can be obtained.
[0039]
An evaluation device calibration method according to claim 11 is a method for calibrating the internal quality evaluation device using a measurement object for quality evaluation device calibration according to any one of claims 1 to 10,
At the time of a calibration formula creation for creating a calibration formula for obtaining a calibration value corresponding to the quality of the measurement target from the light receiving information of the light transmitted through the measurement target, the quality of the measurement object for calibration of the quality evaluation device is adjusted. Based on the received light 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 to calibrate the quality evaluation device, based on the received light information of the light transmitted through the quality evaluation target in the measurement object for the quality evaluation device calibration and the calibration formula, the quality of the quality evaluation target Measure the corresponding calibration calibration value,
When evaluating the quality of the measurement target by the quality evaluation device, a calibration value corresponding to the quality of the measurement target obtained based on the light receiving information of the light transmitted through the measurement target and the calibration formula, The correction is performed based on a difference between the calibration calibration value and the reference calibration value.
[0040]
The process of creating the calibration formula as described above is a work required for the quality evaluation device to evaluate the quality of fruits and vegetables as the measurement target, and for example, as light reception information of light transmitted through the measurement target, If the configuration is to evaluate the quality of the measurement target based on the spectral spectrum data corresponding to the light absorption characteristics for each wavelength, a calibration formula is created in advance using the information of the second derivative of the spectral spectrum data at a specific wavelength as a variable. There is something to do. In this case, a second derivative of the spectral spectrum data at the specific wavelength is calculated based on the spectral spectrum data obtained for the measurement target, and the quality of the measurement target is calculated from the information and the calibration formula. The corresponding calibration value will be determined.
That is, the correspondence between the quality measurement result obtained by the quality evaluation device and the actual quality of the measured object (fruit and vegetables) is obtained as a function based on the actually measured value.
[0041]
Then, when the above-described calibration formula is created, the quality of the quality evaluation target is corresponded to based on the received light information of light transmitted through the quality evaluation target in the measurement object for calibration of the quality evaluation device and the calibration formula. Measure the reference calibration value to be measured. Then, using a quality evaluation device, based on the received light information obtained for the measurement target, based on the information and the calibration formula, perform a task of obtaining a calibration value corresponding to the quality of the measurement target from the calibration formula. Become.
[0042]
Next, at the time of device calibration for calibrating the quality evaluation device, based on the light receiving information of the light transmitted through the quality evaluation target in the measured object for quality evaluation device calibration and the calibration formula, the quality of the quality evaluation target is corresponded. Measure the calibration calibration value. In other words, as the work of obtaining the calibration value corresponding to the quality of the measurement target as described above is performed, the measurement result of the quality evaluation device is shifted to a value different from an appropriate value due to aging or the like. There is. Therefore, the calibration calibration value corresponding to the quality of the quality evaluation target is measured using the measurement object for the quality evaluation device calibration, and if there is no difference between the calibration calibration value and the reference calibration value, the measurement result is shifted. However, if there is a difference between the two, it means that the measurement result has shifted.
[0043]
Therefore, when evaluating the quality of the object to be measured by the quality evaluation device, a calibration value corresponding to the quality of the object to be measured determined based on the light reception information of the light transmitted through the object to be measured 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 that the reference calibration value becomes a measurement result corresponding to the measured initial state.
[0044]
Thus, an evaluation device calibration method capable of calibrating an internal quality evaluation device using a measurement object for quality evaluation device calibration can be provided.
[0045]
BEST MODE FOR CARRYING OUT THE INVENTION
[0046]
[First Embodiment]
Hereinafter, a first embodiment of a measurement object for calibrating a quality evaluation device according to the present invention and a method for calibrating a quality evaluation device using the same will be described with reference to the drawings.
[0047]
First, a transmission type quality evaluation device H1 to be calibrated by an object to be measured for quality evaluation device calibration according to the first embodiment will be described. This device H1 is a device for measuring the sugar content and the acidity as the quality of fruit and vegetables such as tangerine as a measurement target, and as shown in FIG. 1, a light receiving unit 2 that receives light transmitted through the measurement target M and measures the received light, and a control unit 3 as control means for controlling the operation of each unit. M is configured to be placed and transported in a line in a row by a transport conveyor 4 as transporting means, and is configured to sequentially pass through the locations to be measured by the present apparatus. Then, in a state where the light projected from the light projecting unit 1 is transmitted through the measuring object M and received by the light receiving unit 2, the light projecting unit 1 The unit 2 is configured as a transmission-type quality evaluation device that is disposed separately on both left and right sides of the measurement target location, that is, on both sides in the transport width direction of the transport conveyor 4.
[0048]
Next, the configuration of the light emitting 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 to a measurement target located at a measurement target location with different optical axes for irradiation. I have. Further, it is configured such that two optical axes for irradiation by each light source intersect at or near the surface portion of the measurement object located at the measurement object location.
That is, as shown in FIG. 7, a light source 5 composed of two halogen lamps separated from each other in the transport direction by the transport conveyor 4 is provided, and the following light source 5 is provided corresponding to each of these two light sources 5. An optical system is provided. That is, a concave light reflector 6 is provided as a light collecting means for reflecting light emitted from the light source 5 to focus on the surface of the measurement object M, and the light is focused by the light reflector 6. Plate 7, which is positioned so as to correspond to the vicinity of the focal position of the light, and suppresses the spread of the condensed light to the radially outward side by passing through a large stop hole 7 a. 7, a light amount adjusting plate 8 that can be switched between a state in which light passes through, a state in which light passes through a small aperture 8a, and a state in which light is blocked. A collimator lens 9 that changes the light into parallel light, a reflector 10 that reflects and bends the light converted into parallel light, and a condenser lens 11 that collects the light reflected by the reflector 10 for one light source 5. It is provided as an optical system. Each of the light quantity adjusting plates 8 is swingably operated integrally by an electric motor 12, and is configured to be freely switchable to each of the above states.
[0049]
As shown in FIGS. 1 and 3, the light projecting section 1 has a configuration in which the above-described members are housed in a casing 13 and assembled into a unit. Further, the light projecting unit 1 is provided in an oblique posture so as to irradiate the measurement object located at the measurement object position with light obliquely downward.
[0050]
Next, the configuration of the light receiving section 2 will be described.
As shown in FIG. 3, the light receiving unit 2 includes a collimator lens 14 that changes light transmitted through the measurement target M into parallel light, and a wavelength range (600 nm) of a measurement target to be described later among light converted into parallel light. (Up to 1000 nm), a bandpass mirror 15 that reflects only light in the range upward and passes light of other wavelengths as it is, and a condenser lens 16 that collects measurement target light reflected upward by the bandpass mirror 15. A shutter mechanism 17 that can be switched between an open state in which the light that has passed through the condenser lens 16 passes as it is and a shielded state in which the light to be measured is prevented from passing, and light that has passed through the shutter mechanism 17 in the open state. Then, the light amount of the light that has passed straight through the spectroscope 18 and the bandpass mirror 15 for dispersing the light and measuring the spectral data. It is configured to include a like light-power detection sensor 19 for detecting. In the drawing, E is a filter switching mechanism for switching a wavelength calibration filter.
[0051]
As shown in FIG. 5, the spectroscope 18 reflects the measurement target light incident from the light entrance 20 which is the light receiving position, and separates 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 of each wavelength of the light to be measured separated by the concave diffraction grating 22 and shield light from the outside. It is arranged in a dark box 24 made of a material. The light receiving sensor 23 is constituted by a 1024-bit charge storage 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 the signal. Have been. Although not described in detail, the line sensor includes a photoelectric conversion unit that converts a light amount into an electric signal (electric charge) for each unit pixel, a charge accumulation unit that accumulates electric charge obtained by the photoelectric conversion unit, and A drive circuit and the like for outputting the accumulated charges to the outside are provided. Note that the charge storage time can be externally changed via a drive circuit.
[0052]
As shown in FIG. 6, the shutter mechanism 17 includes a disk 17A having a plurality of radially formed slits 25 in a state of being rotated around a vertical axis by a pulse motor 17B. When the slits 25 are vertically overlapped with each other, the light entrance 20 has an open state that allows light to pass therethrough, and a light-blocking state that blocks light when the position of the slit 25 is shifted. A transmission hole 27 is formed, and the disk 17A is arranged so as to slide in close contact with the light entrance 20 of the dark box so as not to leak light. That is, the shutter mechanism 17 is provided in a state of being close to the light entrance 20 for the concave diffraction grating 22 as a spectral unit.
As in the light projecting section 1, the light receiving section 2 has a configuration in which the above-described members are housed in a casing 28 and assembled into a unit as shown in FIGS.
[0053]
Then, a vertical position adjusting mechanism 29 capable of vertically adjusting the position of the light projecting section 1 and the light receiving section 2 with respect to the apparatus frame F, and each of the light projecting section 1 and the light receiving section 2 are separately provided in the apparatus. A horizontal position adjusting mechanism 30 capable of adjusting the position in a direction approaching and separating from the measurement object located at the measurement object position with respect to the frame body F, that is, a horizontal direction and a direction orthogonal to the conveying direction of the conveyor. Provided.
In addition, as shown in FIGS. 1 to 4, four fixed support rods 31 are provided in a state where the four fixed support rods 31 are suspended from the upper side of the apparatus frame F in a fixed state. At the lower end of the rod 31, a support 32 for mounting and supporting a measured object A for calibration of a quality evaluation device described later is attached. An elevating table 34 is slidably supported in the up and down direction by four sliding support portions 33 with respect to the four fixed support bars 31. Further, a feed screw 35 supported in a hanging 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 an elevating table 34 is attached to the feed screw 35. The lifting table 34 can be vertically moved to an arbitrary position by rotating the feed screw 35 with an electric motor 36. Note that the feed screw 35 is also configured to be rotatable with a manual operation handle 38. Thus, the screw feed type vertical position adjusting mechanism 29 is configured.
[0054]
As shown in FIG. 4, the elevating table 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. Each of the unit 1 and the light receiving unit 2 is slidably supported by each guide bar 39 via support members 40 and 41. The guide bars 39 are connected at both ends in the longitudinal direction by connecting members 39a. In addition, 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 are provided on the elevating table 34 so as to be rotatable by electric motors 44 and 45, respectively. Female screw portions 46 and 47 provided on the support members 40 and 41 are screwed into the respective feed screws 42 and 43, and the respective feed screws 42 and 43 are respectively rotated forward and reverse by the electric motors 44 and 45. By doing so, the light projecting unit 1 and the light receiving unit 2 can be individually adjusted in position along a horizontal direction orthogonal to the conveying direction of the conveyor 4. Thus, 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 elevating table 34 is vertically moved and adjusted, and accordingly, the light emitting unit 1 and the light receiving unit 2 supported by the elevating table 34 are integrated. Up and down movement can be adjusted, and by turning each of the electric motors 44 and 45, the light emitting unit 1 and the light receiving unit 2 are individually adjusted in position in a horizontal direction orthogonal to the transport direction of the transport conveyor 4. be able to.
[0056]
A reference filter 49 is provided above the location where the measurement object M is expected to pass on the transport conveyor 4 and supported by a support arm 48 extending downward from the support table 32. The reference filter 49 is configured by an optical filter having a predetermined absorbance characteristic, and specifically includes a pair of opal glasses.
[0057]
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 placed on the conveyor 4 as shown in FIG. The normal measurement state in which the light is received by the light receiving unit 2 after passing through the object M, and the light from each light projecting unit 1 is transmitted through the reference filter 49 as shown by the phantom line in FIG. As shown by the solid line in FIG. 2, the reference measurement state received by the controller is configured to be able to be switched to calibration measurement information as described later.
[0058]
The control unit 3 is configured using a microcomputer, and as shown in FIG. 10, controls the internal quality of the measurement target based on the detection information of the passage detection sensor 500, the light amount detection sensor 19, and the light receiving sensor 23. An analysis unit 100 for analyzing and an operation control unit 101 as a control unit for controlling the operation of each unit are provided in the form of a control program. That is, while performing a calculation process for analyzing the internal quality of the measurement object M using a spectroscopic analysis technique which is a known technique as described later, the shutter mechanism 17, the light amount adjustment motor 12, the vertical position adjustment motor 36, The configuration is such that the operation of each unit such as the management of the operation of the horizontal position adjusting motors 44 and 45 is controlled.
[0059]
Next, a control operation by the operation control means 101 will be described.
The operation control unit 101 irradiates the reference filter 49 with light from the light projecting unit 1 in place of the measurement target M prior to normal measurement on the measurement target M, and transmits light transmitted from the reference filter 49. And a reference data measurement mode for obtaining spectral spectrum data obtained by receiving the separated light by the light receiving unit 2 as reference spectral data, and a measurement target M conveyed by the conveyor 4. A normal data measurement mode for irradiating light from the light projecting unit 1 to obtain measured spectral data and analyzing the internal quality of the measuring object M based on the measured spectral data and the reference spectral data. It is configured to be freely switchable.
[0060]
More specifically, in the reference data measurement mode, the vertical position adjusting mechanism 29 switches to the reference measurement state while the conveyance of the measurement target M by the conveyance 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 on the reference filter 49 instead of the measurement target M, and the transmitted light from the reference filter 49 is transmitted to the light receiving unit 2. And spectral light data obtained by receiving the separated light is measured as reference spectral light data.
[0061]
In the reference data measurement mode, a detection value (dark current data) of the light receiving sensor 23 in a non-light state in which 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 shielded state, and the detection value of each unit pixel of the light receiving sensor 23 at that time is obtained as dark current data.
[0062]
Next, a control operation in the normal data measurement mode will be described.
In the normal data measurement mode, the elevation table 34 is switched to the normal measurement state by operating the vertical position adjustment mechanism 29, and the transport object 4 is transported by the transport conveyor 4. Then, based on the information detected by the passage detection sensor 50, a cycle in which the measurement target passes through the measurement target location is detected, and in a state synchronized with the cycle, the separated light is received and the charge accumulation operation is performed for a set time. 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 charges are repeated at a set cycle.
That is, as shown in FIG. 11, in a time zone in which each measurement target M is predicted to pass through the measurement target location, the light receiving sensor 23 performs the charge accumulation process for the set time, and the measurement target M is moved to the measurement target location. The operation of the light receiving sensor 23 is performed so as to execute a sending process of sending out the accumulated charge for a set time at a timing such that the vicinity of the intermediate position between the respective measurement objects M which are predicted not to exist at the measurement object position. Control. Therefore, in this device, the charge accumulation time by the light receiving sensor 23 is always constant. When the processing capacity is set such that seven measurement objects pass through each second, the set time T1 for executing the charge accumulation processing is about 140 msec.
[0063]
When the light receiving sensor 23 performs the charge accumulation process, the operation control unit 101 switches from the blocking state to the open state in the state where the light receiving sensor 23 performs the charge accumulation process, and changes the open state to the open maintaining time Tx. The operation of the shutter mechanism 17 is controlled so as to return to the shielded state after being maintained for a lapse of time, and the open maintaining time Tx is configured to be changed and adjusted based on the change command information.
The opening maintaining time Tx is configured to be changed in accordance with the type of the measurement target. To add an explanation, for example, in the case of Satsuma mandarin, light is relatively easily transmitted, so that it is set to a relatively short time (about 10 msec). Set to.
The setting of the operating conditions depending on the kind of the kind is configured to be manually performed by a worker. That is, as shown in FIG. 10, a switching operation tool C that artificially switches the setting position according to the type of the product is provided, and the setting information of the switching operation tool C is input to the control unit 3. The opening maintaining time Tx is changed and adjusted according to the setting information.
[0064]
In addition, the operation control unit 101 determines whether the measurement target has reached the measurement target position based on the amount of light received by the light amount detection sensor 19, that is, the change in the actually measured value of the light transmission amount of the measurement target. The shutter mechanism 17 is switched to the open state when the arrival of the measurement object is detected, and after maintaining the open state for the open maintaining time Tx, the shutter mechanism 17 is closed. The configuration is switched to end the measurement processing.
More specifically, FIG. 11 shows a change state of the detection value of the light amount detection sensor 19 over time. Until the measurement target arrives, the light projected from the light projecting unit 1 outputs almost the maximum value. However, when the measurement target M reaches the measurement location, the measurement light is blocked and the light amount detection sensor detects the measurement light. When the value (light reception amount) starts to decrease and the detection value decreases below a preset value (t1), it is determined that the measurement object has reached the measurement location, and the set time has elapsed from that point. At this time (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 closed state.
[0065]
If the transport conveyor 4 stops abnormally while such a measurement process is being performed, the shutter mechanism 4 in the light emitting unit 1 is closed and the measurement target stopped moving. For a long time, strong light from a light source is prevented from being irradiated.
[0066]
The analysis means 100 is configured to execute an arithmetic process for analyzing the internal quality of the measurement target M based on the various data obtained in this manner by using a known spectral analysis technique. I have.
In other words, 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 each of the separated wavelengths is measured. The absorbance spectrum data is obtained, and the second derivative of the absorbance spectrum data is obtained. Then, it is configured to execute an analysis calculation process for calculating a component amount corresponding to the sugar content and a component amount corresponding to the acidity contained in the measurement target M by the second derivative value and a preset calibration formula. ing.
Assuming that the absorbance spectrum data d is Rd for the reference spectral data, Sd for the measured spectral data, and Da for the dark current data,
[0067]
(Equation 1)
d = log {(Rd-Da) / (Sd-Da)}
[0068]
It is calculated by the following arithmetic expression.
Then, the control unit 3 uses the value of the specific wavelength among the values obtained by secondarily differentiating the absorbance spectrum data d obtained in this way and the calibration equation as shown in the following Expression 2 to obtain the measurement target. The calibration value for calculating the component amount corresponding to the sugar content and the acid content contained in the product M is obtained.
[0069]
(Equation 2)
Y = K0 + K1 · A (λ1) + K2 · A (λ2)
[0070]
However,
Y: Calibration value corresponding to component amount
K0, K1, K2; coefficient
A (λ1), A (λ2); second derivative of absorbance spectrum at specific wavelength λ
[0071]
Note that 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 equation as described above is individually set for each device based on data obtained by actually measuring a sample similar to the measurement target object before the measurement processing on the measurement target object. .
In addition, tens to hundreds of objects to be measured are prepared as the samples, and the spectral evaluation data for each wavelength is obtained for each sample by using the quality evaluation device H1. Further, for each of the samples, a real component amount detection process of accurately detecting a chemical component of the measured object by a special inspection device based on, for example, destructive analysis or the like is performed to obtain a real component amount of the measured object. . Then, using the spectral data of each sample obtained as described above, while comparing with the detection result of the actual component amount, using the method of multiple regression analysis, the spectral data and the specific component The calibration equation indicating the relationship with the component amount is obtained.
[0073]
Next, the measurement object A for calibration of the quality evaluation device for calibrating the quality evaluation device H1 as described above will be described.
When calibrating the quality evaluation device H1 using the measurement object A for calibration of the quality evaluation device, the calibration is performed with the measurement object A mounted on the support table 32, as shown in FIG. Is supposed to do it. The measurement object A is placed on the support 32 in a state where it is positioned as it is, and is configured to be easily detachable. When calibration is not performed, the measurement object A is detached from the support 32. Can be kept.
[0074]
The measuring object A for calibration of the quality evaluation device is provided with pure water J as a quality evaluation target whose quality is evaluated by the quality evaluation device H1 in a state of being maintained at a set temperature by a temperature adjusting means. A storage section 51 for storing pure water J to be evaluated and the temperature adjusting means are integrally assembled in a unit shape. Further, an outer casing 52 is provided on the outer peripheral portion of the storage portion 51 in which the quality evaluation target is stored so as to cover the storage portion 51 in a state where the air layer K is formed. It is configured to
[0075]
More specifically, as shown in FIG. 12, the outer peripheral portion is covered by a substantially quadrangular prism-shaped outer casing 52 made of a non-light-transmitting member. A storage portion 51 for storing pure water J as an object of quality evaluation in a sealed state is provided at a location (a location located on the lower side when placed on the support base 32). An air layer K is formed between the two. The other end portion in the longitudinal direction of the outer casing 52 (the portion located on the upper side when placed on the support table 32) is hermetically sealed by the partition wall 53 with respect to the storage space in which the storage portion 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 of exerting a heat transfer effect between the air layer K and the air conditioning space. A fan 56 for blowing air in a direction away from the surface of the Peltier element 55 is provided on the air layer K side surface of the Peltier element 55, and a control circuit 57 for operating the Peltier element 55, a fan A driving circuit 58 for driving the driving device 56 and a power supply device 59 are provided. The control circuit 57 sets the temperature of the air layer K detected by a temperature sensor (not shown) to the temperature of the measurement object when the quality is evaluated by the quality evaluation device or to a set temperature (30 ° C.) close to the temperature. Is controlled so that the Peltier element 55 is operated 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 maintained at the set temperature. In addition, a flat plate 60 is provided to receive the air blown by the fan 56 so as not to directly hit the storage unit 51 and to make the temperature in the air layer K as uniform as possible.
[0077]
As shown in FIG. 13, the temperature-controlled air sent out by the fan 56 is received by the leveling plate 60, and is gently guided along the periphery of the storage section 51 without directly hitting the storage section 51. And the temperature of the air layer K is controlled so that the entire temperature of the air layer K becomes substantially equal to the set temperature.
[0078]
A light passing portion 61 and a light passing portion 62 are formed at positions corresponding to left and right sides of the storage portion 51 in the outer casing 52, respectively. That is, a passage hole is formed at a position corresponding to the light entrance side light passage part 61 and the light exit side light passage part 62 of the outer casing 52 made of a non-translucent member, and the opal glass G as a diffuser is formed. Are mounted in an airtight state.
[0079]
A calibration method for calibrating the quality evaluation device H1 using the measurement object A for calibration of the quality evaluation device configured as described above will be described below.
That is, when the quality evaluation device H1 is calibrated using the measurement object A for the quality evaluation device calibration, first, as described above, when the calibration formula is created prior to the measurement processing for the measurement target object, In the above, based on the light reception information of the light transmitted through the quality evaluation target in the measurement object A for calibration of the quality evaluation device, that is, the quality of the quality evaluation target (pure water) corresponding to the spectral equation data and the calibration formula. Measure the reference calibration value.
[0080]
FIG. 14 shows measurement data by the present applicant. The line L1 shows the second derivative spectrum data of the spectrum data of the light transmitted through the pure water, and the line L2 shows the second derivative spectrum of the light spectrum of the light transmitted through the apple as an example of fruits and vegetables. Shows the data. From this figure, it is clear that pure water has the same light absorption characteristics as fruits and vegetables.
[0081]
Thereafter, after the measurement processing for the measurement target is performed, at the time of device calibration for calibrating the quality evaluation device H1, light reception information (spectral spectrum) of light transmitted through the quality evaluation target in the measurement target A for quality evaluation device calibration is used. 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 of the measurement object is evaluated by the quality evaluation device H1, 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 calibrated. Correction is performed based on the difference between the calibration value for use and the reference calibration value.
[0082]
Specifically, such a calibration process is performed by the control unit 3. In addition, the control unit 3 executes the following processing. That is, the operation control means 101 is configured to be freely switchable to a calibration data measurement mode in addition to the above-described reference data measurement mode and normal data measurement mode.
Then, when the above-described calibration formula is created, the measurement target A for calibration of the quality evaluation device is manually placed on the support 32, and the operation control unit 101 switches to the calibration data measurement mode. Then, the light projecting unit 1 and the light receiving unit 2 are integrally moved up and down by the vertical position adjusting mechanism 29 so that the light from the light projecting unit 1 is calibrated by the quality evaluation device as shown in FIGS. Is switched to the calibration measurement state in which the light is received by the light receiving unit 2 after passing through the quality evaluation target (pure water) in the measurement object A for use. 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 transmitted to the external light receiving unit 2 through the light passing unit 62. The reference calibration value α corresponding to the quality of the quality evaluation target (pure water) is measured and stored based on the light receiving information (spectral spectrum data) of the light received by the light receiving unit 2 and the calibration formula.
Therefore, in this embodiment, the light passing portion 61 functions as a light-entering side light passing portion IP that diffuses measurement light and guides the measurement light to the quality evaluation target, and the light passing portion 62 transmits light passing through the quality evaluation target. Function as a transmission light exit side light passage portion OP1 for guiding the light to the outside along the direction in which the measurement light is projected.
[0083]
Thereafter, the mode is switched to the normal data measurement mode, and the light projecting unit 1 and the light receiving unit 2 are vertically moved and adjusted integrally by the vertical position adjusting mechanism 29, thereby switching to the normal measurement state as shown in FIG. A measurement process is performed on the object.
[0084]
When the mode is switched to the calibration data measurement mode at the time of device calibration for calibrating the quality evaluation device H1, the vertical position adjusting mechanism 29 integrally adjusts the light projecting unit 1 and the light receiving unit 2 to move up and down. Switching to the measurement state, the quality evaluation target (pure) is determined based on light receiving information (spectral spectrum data) of light transmitted through pure water as a quality evaluation target in the measurement target A for calibration of the quality evaluation device and a calibration equation. The calibration calibration value β corresponding to the quality of water is measured and stored.
[0085]
When the quality of the object to be measured is evaluated by the quality evaluation device H1 after the completion of the measurement for such calibration, the state is switched to the normal measurement state by the vertical position adjustment mechanism 29 and the object to be measured is transmitted as described above. The calibration value Y corresponding to the quality of the measurement object obtained based on the received light information of the obtained light and the calibration formula 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 final quality of the measurement object. Here, K3 in Equation 3 is a predetermined coefficient.
When the calibration calibration value β is not measured at the initial stage of the installation of the quality evaluation device H1, the same value as the reference calibration value α is substituted for the calibration calibration value β. The value Y directly corresponds to the quality of the final measurement object.
[0086]
[Equation 3]
Ys = Y + K3 · (α-β)
[0087]
Even if the calibration value measured due to the aging of the device in this way deviates from the actual fruit and vegetable quality (acidity or sugar content), measurement of the measurement target A for calibration of the quality evaluation device is performed. 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 to correct the calibration value.
[0088]
[Second embodiment]
Next, a description will be given of a second embodiment of the measured object A for calibrating the quality evaluation device and the method for calibrating the quality evaluation device using the same according to the present invention.
[0089]
First, the configuration of the quality evaluation device H2 to be calibrated in this embodiment will be described. The quality evaluation device H2 is a device for measuring the sugar content and the acidity as quality for fruit and vegetables such as peaches and pears, for example. The configuration is the same as that of the first embodiment except that the configuration of the light passage path for the unit 2 and the configuration of the transport conveyor 4a are different. Therefore, 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 into a unit, and share the same configuration as that used in the quality evaluation device H1 in the first embodiment. .
[0090]
This quality evaluation device H2 is configured as a semi-transmission type quality evaluation device, and as shown in FIGS. 15 and 17, a unit having the same configuration as the light projecting unit 1 in the quality evaluation device H1 in the first embodiment. And two sets of light-emitting units 1 are arranged on the left and right sides of the measurement target location, that is, on both sides of the conveyance conveyor 4a in the conveyance width direction. 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 the object to be measured mounted on a receiving tray 71 having an insertion hole 70 formed at the center thereof. The light receiving side end of an optical fiber 72 that receives light that is irradiated from above and transmits through the measurement object and transmits downward through the insertion hole 70 of the tray 71 is disposed. The other end 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 device H1 in the first embodiment.
The analysis process of the internal quality by the control unit 3 based on the light receiving information by the light receiving unit 2 is the same as that of the first embodiment.
[0091]
Next, the measurement object A for calibration of the quality evaluation device used in the quality evaluation device H2 will be described. The configuration of the measurement object A for calibration of the quality evaluation device in this embodiment is the same as that of the first embodiment except for the configuration of the light passage path, so that only different points will be described, and the same configuration will not be described. Omitted.
[0092]
As shown in FIG. 18, the measured object A includes a light passing unit 73 that diffuses measurement light projected from the light projecting unit 1 and guides the measurement light to a quality evaluation target (pure water J). And a light passing unit 74 that guides the light guided through the target and passed through the quality evaluation target to the outside in a direction orthogonal to the direction in which the measurement light is projected. That is, the light passing portions 73 are formed on the left and right sides corresponding to the left and right light projecting portions 1 respectively, and the light passing portions 74 are formed on the lower side. A passage hole is formed at a position corresponding to 73 and the light passage portion 74, and an opal glass G as a diffuser is mounted in a state of being kept in an airtight state. In this embodiment, the light passing portion 73 functions as a light entering light passing portion, and the light passing portion 74 functions as a light emitting light passing portion.
[0093]
When calibrating the quality evaluation device H2 using the measured object A, the measured object A is mounted on the support 32 of the quality evaluation device, and is calibrated by the same calibration method as in the first embodiment. When the reference calibration value α and the calibration calibration value β are measured by switching to the calibration measurement state by the vertical position adjustment mechanism 29 as shown in FIGS. The measuring light projected from the light projecting units 1 on the left and right sides was guided to the quality evaluation target (pure water J) through the light passing units 73 on both the left and right sides, and the light transmitted therethrough was formed on the lower side. The light is received by the light receiving side end of the optical fiber 72 through the light passing portion 74 and the insertion hole 70 of the receiving tray 71, and is received by the light receiving portion 2 through the optical fiber 72, and the light receiving information is measured. At this time, the light that has passed through the lower light passage portion 74 passes through the reference filter 49 in the vertical direction. However, the upper and lower sides of the reference filter 49 are made of transparent glass, and the light passes as it is. Configuration.
[0094]
The measuring object A for calibration of the quality evaluation device in this embodiment is a measuring object in which each of the light passing portions 73 formed on the left and right sides of the storage section 51 for storing the quality evaluation target is projected from the light projection section 1. It functions as a light-entering-side light passing unit IP that diffuses light and guides the light to the quality evaluation target (pure water). A light passing unit 74 formed below the storage unit 51 measures light passing through the quality evaluation target. Although it functions as a semi-transmission light-emitting side light passage portion OP2 for guiding the light to the outside along a direction orthogonal to the direction in which light is projected, the measurement object A for calibration of the quality evaluation device in the embodiment is The transmission type quality evaluation device described in the first embodiment can also be used as a transmission type quality evaluation device. When applied to the transmission type quality evaluation device H1, the light passing portions 73 formed on both the left and right sides are applicable. Any one of the light-receiving side light passage portions 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 this time, the light passing portion formed below the storage portion 51 is closed.
[0095]
Therefore, the measurement object A for calibration of the quality evaluation device is, as the light exit side light passing portion OP, the light guided through the light entrance side light passage portion IP and passed through the quality evaluation target in the direction in which the measurement light is projected. The light exit side light passing portion OP1 for transmission, which is guided to the outside along the line, and the light guided through the input side light passing portion, which has passed through the quality evaluation target, is transmitted along the direction orthogonal to the direction in which the measurement light is projected. , And a semi-transmission light-emission-side light passing portion OP2 for guiding the light to the first stage, and can be used as both the transmission quality evaluation device H1 and the semi-transmission quality evaluation device H2.
[0096]
[Another embodiment]
Hereinafter, other embodiments will be listed.
[0097]
(1) In each of the embodiments described above, pure water is provided as a quality evaluation target whose quality is evaluated by the quality evaluation device. However, instead of such pure water, the quality of the measurement target has For example, an aqueous solution having the same quality as that of acid or sugar may be provided as a quality evaluation target.
[0098]
(2) In each of the above embodiments, the pure water as a quality evaluation target whose quality is evaluated by the quality evaluation device is provided in a state of being maintained at a set temperature by a temperature adjusting unit. A temperature different from such a temperature may be set instead of the temperature of the measurement object or a temperature close to the temperature of the measurement target when the quality is evaluated by the quality evaluation device as in the above-described embodiment.
[0099]
(3) In each of the above embodiments, an outer casing is provided to cover the storage section in a state where an air layer is formed on an outer peripheral portion of the storage section in which the quality evaluation target is stored, and the temperature adjusting means includes the air layer. Although the temperature control function has been illustrated as an example, instead of such a configuration, a temperature control function is performed by directly acting on the quality evaluation object stored in the storage unit. You may.
[0100]
(4) In each of the above-described embodiments, an example is described in which the storage section in which the quality evaluation target is stored and the temperature adjustment unit are integrally assembled in a unit shape. Instead of assembling the storage section to be stored and the temperature adjustment means integrally into a unit, the storage section and the temperature adjustment means are configured to be stored separately from each other, and when the calibration is performed, the temperature adjustment means is used. The adjustment processing may be performed so that the temperature of the quality evaluation target becomes the set temperature.
[0101]
(5) In 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]
(6) In each of the above embodiments, a configuration is provided in which the temperature adjustment unit that holds pure water as a quality evaluation target at the set temperature is provided, but a configuration without such a temperature adjustment unit may be provided. Then, in that case, in order to reduce a measurement error caused by a temperature change, a temperature measurement unit for measuring the temperature of the pure water is provided, and information on the temperature of the pure water is taken into account as measurement information for calibration. It may be.
More 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 is measured. The map data is stored together with the information of. Then, at the time of device calibration, when measuring the calibration calibration value β, 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 the data to the same temperature is newly added. The calibration value corresponding to the quality of the measurement target may be corrected based on the difference between the reference 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, and The entrance part 81 and the exit part 82 may be provided with an opal glass G as a light diffuser, respectively, and a water temperature meter 83 as a temperature measuring means for measuring the temperature of the pure water J in the storage part 80.
[0104]
(7) In each of the above embodiments, the light that is guided through the light-incident-side light passing unit and that has passed through the quality evaluation target is externally provided along the direction in which the measurement light is projected, as the light-exiting-side light passing unit. A light-emitting side light-passing portion for transmission that guides light, and light guided through the input-side light passing portion and passing through the quality evaluation target is guided to the outside along a direction orthogonal to a direction in which the measurement light is projected. Although a configuration including a light-emitting side light transmitting portion for semi-transmission has been illustrated, the invention is not limited to such a configuration, and a configuration including only a light-emitting side light transmitting portion for transmission may be used. It is good also as a structure provided only with the light-emitting side light passage part for use.
[0105]
(8) In each of the above embodiments, the storage section for storing the pure water is formed of a light-transmitting member, and the light entrance side light passage section and the light exit side light passage section are formed in the outer casing. Although the configuration in which the opal glass G is provided as an example has been illustrated, instead of such a configuration, the storage portion is formed of a material having a light transmitting property and a light diffusing function, such as a ground glass, for example. A configuration without the glass G may be adopted.
[Brief description of the drawings]
FIG. 1 is a front view of a transmission type quality evaluation device.
FIG. 2 is a front view of a transmission type quality evaluation device.
FIG. 3 is a longitudinal sectional front view of a main part in a measurement state for calibration of a transmission type quality evaluation device.
FIG. 4 is a cross-sectional plan view of a transmission type quality evaluation device.
FIG. 5 is a configuration diagram of a spectroscope.
FIG. 6 illustrates a shutter mechanism.
FIG. 7 is a cutaway plan view of the light emitting unit.
FIG. 8 is a plan view showing an installation state.
FIG. 9 is a timing chart of a measurement operation.
FIG. 10 is a control block diagram.
FIG. 11 is a diagram showing a change in the amount of received light and measurement timing.
FIG. 12 is a cutaway front view of a measured object for calibration of a quality evaluation device.
FIG. 13 is a partially cutaway side view of an object to be measured for calibration of a quality evaluation device.
FIG. 14 is a diagram showing spectral spectrum data.
FIG. 15 is a front view of a semi-transmission type quality evaluation device.
FIG. 16 is a front view of a semi-transmission type quality evaluation device.
FIG. 17 is a longitudinal sectional front view of a main part of a semi-transmission type quality evaluation device in a measurement state for calibration.
FIG. 18 is a cross-sectional view of an object to be measured for calibrating a quality evaluation device according to a second embodiment.
FIG. 19 is a sectional view of an object to be measured for calibrating a quality evaluation device according to another embodiment.
[Explanation of symbols]
51 Storage section
52 Outer casing
55 Temperature control means
83 Temperature measurement means
H1, H2 quality evaluation device
J pure water
IP light entrance side light passage
OP Outgoing light passage

Claims (11)

A quality evaluation device that projects measurement light including a wavelength for quality evaluation on fruits and vegetables as a measurement target and evaluates the quality of the measurement target from light reception information of light transmitted through the measurement target. Is an object to be measured for calibration of a quality evaluation device,
A measurement object for calibration of a quality evaluation device, which includes pure water as a quality evaluation target whose quality is evaluated by the quality evaluation device. The object to be measured for calibrating a quality evaluation device according to claim 1, further comprising a temperature measuring means for measuring a temperature of the pure water. A quality evaluation device that projects measurement light including a wavelength for quality evaluation on fruits and vegetables as a measurement target and evaluates the quality of the measurement target from light reception information of light transmitted through the measurement target. Is an object to be measured for calibration of a quality evaluation device,
A measurement object for calibration of a quality evaluation device, which is provided with a quality evaluation target whose quality is evaluated by the quality evaluation device being held at a set temperature by a temperature adjusting unit. 4. The measurement object for calibrating a quality evaluation device according to claim 3, wherein a storage section for storing the quality evaluation target and the temperature adjusting means are integrally assembled in a unit shape. The measurement object for calibrating a quality evaluation device according to claim 3 or 4, wherein the set temperature is a temperature of the measurement object or a temperature close thereto when the quality is evaluated by the quality evaluation device. The measurement object for calibrating a quality evaluation device according to any one of claims 3 to 5, wherein pure water is provided as the quality evaluation target. A light-incident-side light passing unit that diffuses the measurement light and guides the quality evaluation target to the quality evaluation target, and a light-exiting-side light passing unit that diffuses light passing through the quality evaluation target and guides the light to the outside. 7. The measurement object for calibrating the quality evaluation device according to any one of 6. As the light exit side light passing section,
A light-emitting side light transmitting portion for transmission that guides light guided through the light-entering side light passing portion and passing through the quality evaluation target to the outside along the direction in which the measuring light is projected,
A semi-transmissive light-emitting side light passing unit for guiding light guided through the input-side light passing unit and passing through the quality evaluation target to the outside along a direction orthogonal to a direction in which the measurement light is projected. The object to be measured for calibrating the quality evaluation device according to claim 7, wherein the object to be measured is configured as follows. 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 is provided,
The measurement object for calibration of a quality evaluation device according to any one of claims 3 to 8, wherein the temperature adjustment unit is configured to perform a temperature control operation on the air layer. 10. The light-transmitting member is constituted by a member having a light-transmitting property, the outer casing is formed by a non-light-transmitting member, and the light-entering-side light passing portion and the light-emitting-side light passing portion are formed. Measurement object for calibration of quality evaluation equipment. An evaluation device calibration method for calibrating the quality evaluation device using the measurement object for quality evaluation device calibration according to any one of claims 1 to 10, wherein a light transmitted through the measurement object is received. At the time of the calibration formula creation to create a calibration formula for obtaining a calibration value corresponding to the quality of the measurement target from the information, light reception information of light transmitted through the quality evaluation target in the measurement object for the quality evaluation device calibration and Based on the calibration formula, measure a reference calibration value corresponding to the quality of the quality evaluation target,
At the time of device calibration to calibrate the quality evaluation device, based on the received light information of the light transmitted through the quality evaluation target in the measurement object for the quality evaluation device calibration and the calibration formula, the quality of the quality evaluation target Measure the corresponding calibration calibration value,
When evaluating the quality of the measurement target by the quality evaluation device, a calibration value corresponding to the quality of the measurement target obtained based on the light receiving information of the light transmitted through the measurement target and the calibration formula, A method for calibrating a quality evaluation device for correcting based on a difference between the calibration calibration value and the reference calibration value.

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