JP2003270134A - Spectroscopic analyzer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spectroscopic analyzer which can accurately analyze internal qualities of a measuring object regardless of the size of the measuring object. <P>SOLUTION: The spectroscopic analyzer comprises a projection means 10 projecting light on a measuring object M which is located at a measuring object position T, a light receiving means 11 for spectrally diffracting reflected light from the measuring object M, and receiving spectrally diffracted light, and a control means 3 for controlling the operation of each part, and is constituted so that the control means 3 analyzes the internal quality of the measuring based on the information of the light receiving means 11. The spectroscopic analyzer also comprises a irradiation range changing means 21 to change and adjust the irradiation range of the light irradiating to the measuring object position T from the projection means 5. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projecting means for irradiating an object to be measured located at a position to be measured with light, and a transmitted light from the object to be measured to receive and disperse the dispersed light. Is provided, and a control means for controlling the operation of each part is provided, and the control means is configured to analyze the internal quality of the measured object based on the measurement information of the light receiving means. Existing spectroscopic analyzer.

[0002]

2. Description of the Related Art The above-mentioned spectroscopic analyzer is, for example,
Used as an object to be measured such as fruits and vegetables to analyze internal qualities such as sugar content and acidity of the object. The size of the fruits and vegetables to be measured is different depending on the variety and the like, and the internal quality of the measured objects of various sizes is analyzed. In the conventional spectroscopic analysis device, the irradiation range of the light emitted from the light projecting means toward the measurement target location is constant corresponding to the small measurement object among the measurement objects of different sizes. It is configured to the size of. That is, the irradiation range of the light emitted from the light projecting unit toward the measurement target location is made to correspond to a small object to be measured so that the light transmitted through the object to be measured becomes a wide range with respect to the object to be measured. However, by setting so that the light emitted from the light projecting means toward the measurement target portion can be prevented from going around the measurement target object without passing through the measurement target object, Even when it is large, it is possible to prevent the light emitted from the light projecting means toward the measurement target portion from going around the measurement target object without passing through the measurement target object. Regardless of this, the light emitted from the light projecting means toward the measurement target portion is prevented from wrapping around the object to be measured without passing through the object to be measured. By the way, the light that goes around the object to be measured without passing through the object to be measured has a larger amount of light than the light that passes through the object to be measured. Since the quantity deviates from the proper detectable range and the internal quality of the measured object cannot be analyzed, as described above, the light emitted from the light projecting means toward the measurement target portion is It is necessary to prevent the object to be measured from going around without passing through the object to be measured.

[0003]

In the conventional spectroscopic analysis device, the light emitted from the light projecting means toward the measurement target portion does not pass through the measurement object regardless of the size of the measurement object. Although it is possible to prevent the measurement object from wrapping around, the irradiation range of the light emitted from the light projecting means toward the measurement target location is set to correspond to a small measurement object. Therefore, when the object to be measured is large, the range in which the light emitted from the light projecting unit to the measurement target site passes through the object to be measured becomes narrow relative to the object to be measured, and the narrow range of the object to be measured. Since the internal quality is analyzed by using the measurement information for, and the measurement accuracy is difficult to improve, improvement has been desired in this respect.

By the way, the present applicant has filed Japanese Patent Application No. 12-29.
No. 8655, as shown in FIG. 12, in order to solve the above-mentioned problems, the measurement target portion T is transmitted to the light receiving means 62 without passing through the measured object M in the light emitted from the light projecting means 61. Light-blocking body 6 for blocking the wraparound light that is about to enter
3 has been proposed. In this spectroscopic analyzer, the measured objects M are placed and conveyed in a single column in a column by the conveyor 66, and are configured so as to sequentially pass through the measurement target points T, and the light shield 63 is provided. Includes a frame member 64 and a shielding member 65. More specifically, the frame member 64 includes the light opening 67.
a and 67b are provided on both left and right sides, respectively, so that the light emitted from the light projecting means 61 to the object to be measured M can be passed toward the light receiving means 62 in a direction intersecting the transport direction. The shielding member 65 is provided on each of a side surface of the frame member 64 on the upstream side in the transport direction and a side surface on the downstream side in the transport direction. Then, each of the shielding members 65 is formed with transfer openings 68a and 68b for allowing the object M to be measured to be smoothly transferred and passed, and the edges of the respective transfer openings 68a and 68b are formed. A plurality of tongues Z are formed in the portion in the vertical direction so that there is little gap between them as if they were cut apart from each other.
Are configured to be retractable along the outer surface of the object to be measured M so as to be bent and deformed to allow passage of the object to be measured M. By providing such a configuration, it is possible to suppress the wraparound light that is about to enter the light receiving means without passing through the object to be measured, but the shielding member and the object to be measured are in sliding contact with each other. There is a risk that the surface of the measured object will be scratched, and the shielding member will also be easily scratched, making it difficult to put into practical use.

The present invention has been made paying attention to such a point, and an object thereof is, regardless of the size of an object to be measured,
It is a point to provide a spectroscopic analyzer capable of accurately analyzing the internal quality of an object to be measured.

[0006]

According to a first aspect of the present invention, a light projecting means for irradiating an object to be measured located at a measurement target location with light, and a transmitted light from the object to be measured are received. A light receiving means for separating the received light and measuring the separated light, and a control means for controlling the operation of each part are provided,
The control means, by the light received by the light receiving means,
A spectroscopic analyzer configured to analyze the internal quality of the object to be measured, the irradiation range changing unit changing and adjusting an irradiation range of light emitted from the light projecting unit toward the measurement target location. Is provided.

That is, even when the size of the object to be measured located at the measurement target portion changes depending on the type of the object to be measured, the irradiation range changing means changes the irradiation range according to the size of the object to be measured. By changing and adjusting the light, the light emitted from the light projecting means toward the measurement target portion can be transmitted in a wide range with respect to the measured object, but without passing through the measured object. It is possible to suppress light that goes around the object to be measured and is incident on the light receiving means. In this way, the irradiation range of the light emitted from the light projecting means toward the measurement target portion can be changed and adjusted to an appropriate size according to the size of the object to be measured. It is possible to accurately analyze the internal quality of each of the different measured objects.

Therefore, it has become possible to obtain a spectroscopic analyzer capable of accurately analyzing the internal quality regardless of the size of the object to be measured.

The invention according to a second aspect is characterized in that the irradiation range changing means is configured to selectively use a plurality of types of light passage openings having different opening areas.

That is, a plurality of types of light passage openings having different aperture areas are provided, and one of the plurality of types of light passage openings is selected and used to irradiate the measurement target location. You can change and adjust the light irradiation range. As described above, the configuration of selectively using a plurality of types of light passage openings is simpler than the configuration of the variable diaphragm provided in the camera or the like. By the way, due to the change in the size of the light passage opening, the light quantity changes so that the larger the opening area is, the larger the light quantity becomes. When the irradiation range is changed and adjusted for the object to be measured having such a tendency, the measurement can be performed while maintaining the light amount appropriately.

Therefore, it is possible to obtain a spectroscopic analyzer capable of changing and adjusting the irradiation range with a simple structure.

According to a third aspect of the present invention, the irradiation range changing means is provided with an aperture forming member having the largest aperture of the plurality of types of light passage apertures and installed at a fixed position.
An opening provided with a light passage opening other than the largest of the plurality of types of light passage openings, and the light from the light projecting means is irradiated to the measurement target portion through the light passage opening. An irradiation position and a shield whose position is freely changeable to an irradiation allowable position that does not limit the irradiation range of the light from the light projecting unit with respect to the measurement target portion are provided, and the irradiation range is changed by changing the position of the shield. It is characterized in that it is configured to change and adjust.

That is, by arranging the shield at the irradiation allowable position, the irradiation range of the light emitted from the light projecting means to the measurement target portion is limited by the largest light passage opening provided in the opening forming member. It will be in a state of being. Also, by placing the shield at the aperture irradiation position,
The irradiation range of the light emitted from the light projecting unit to the measurement target position is limited by the light passage opening other than the opening having the largest opening area provided in the shield. Then, as the irradiation range changing means, the irradiation range is changed by rotatably operating a shield provided in a state in which all of the plurality of types of light passage openings are circumferentially spaced at substantially equidistant positions from the center. By sliding the shield configured such that all of the plurality of types of light passage openings are spaced in the sliding movement direction,
Compared to the configuration in which the shield is provided with all of the plurality of types of light passage openings, such as the one configured to change and adjust the irradiation range, the position is changed because the shield does not have to have the largest opening. It is possible to reduce the size of the shield, and as a result, it is advantageous to reduce the size of the entire device.

Therefore, when the position of the shield having the light passage opening is changed to change and adjust the irradiation range, the size of the shield can be reduced to make the entire apparatus compact. A spectroscopic analyzer is obtained.

According to a fourth aspect of the present invention, the shield is
It is characterized in that the position is freely changeable even at a shielding position that shields the light projecting unit from irradiating the measurement target portion with light.

That is, the shield provided for constituting the irradiation range changing means is provided with a shielding portion capable of shielding the light emitted from the light projecting means toward the measurement target portion, and By operating the shield at a shield position where the shield portion shields the light projecting unit from irradiating the measurement target location with light, it is possible to set the state in which the light is not irradiated toward the measurement target location. That is, in such a spectroscopic analysis device, for example, when the object to be measured is conveyed by a conveyor, the object to be measured is interrupted from being conveyed during the analysis work due to a failure of the conveyor, and the light projecting means is used. There is a risk that the object to be measured will continue to be irradiated with the light for a predetermined time or longer and the object to be measured will be burnt or damaged.
In order to avoid such a situation, when the transportation by the transportation means is interrupted, it is possible to block the irradiation of light from the light projecting means to the measurement target position by changing the position of the shielding body to the shielding position. become able to.

Incidentally, in order to avoid such a situation, it is possible to deal with it by turning off the power source of the light source provided in the light projecting means, but in this case,
When the power is turned on again, the amount of light emitted from the light source tends to become unstable, so it is possible to prevent the measured object from being damaged, such as being scorched, but the accuracy of analysis of the internal quality of the measured object. May decrease, which is not preferable as a practical measure. On the other hand, as described above, the light emitted from the light projecting unit toward the measurement target site is blocked between the light projecting unit and the measurement target site, and the light from the light projecting unit is measured. The form in which the irradiation of the object is blocked can prevent the amount of light from the light source from becoming unstable, so that the accuracy of analysis of the internal quality of the object to be measured can be prevented from deteriorating.

Therefore, with a simple structure utilizing the structure of the irradiation range changing means, it is possible to prevent the light irradiated toward the measurement target portion from being damaged, such as burning the object to be measured. A spectroscopic analyzer capable of performing

According to a fifth aspect of the present invention, a plurality of the light projecting means are provided so as to irradiate the measurement target portion with light from different directions.
The opening forming member and the shield are provided, and one driving means is provided so as to perform a position changing operation for a plurality of shields.

That is, since the plurality of light projecting means irradiate the measurement target location, the amount of light irradiated toward the measurement target location is increased, so that the light receiving means receives light to be measured. Since the amount of light transmitted through the object is increased, the internal quality of the measured object can be analyzed well.
Further, an opening forming member and a shield are provided in correspondence with each of the light projecting means so that the irradiation range can be changed with a simple structure. Since the shield provided so as to be operated to change the position by one drive means, a drive means for changing the position of the shield is provided in each of the plurality of light projecting means, and a plurality of drive means are provided. The structure for changing the position of the shield can be simplified as compared with the structure including the driving means.

Therefore, while increasing the amount of light radiated to the measurement target portion to perform a good analysis, the irradiation range of the light radiated to the measurement target portion is changed and adjusted,
It is possible to obtain a spectroscopic analyzer that can accurately analyze the internal quality regardless of the size of the object to be measured and that can simplify the configuration for that purpose.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a spectroscopic analysis device according to the present invention will be described below with reference to the drawings.

First, the structure of this spectroscopic analyzer will be described. As shown in FIG. 1 and FIG. 10, this spectroscopic analysis apparatus includes a light projecting unit 1 for irradiating a measured object M (mandarin orange) with light.
Based on the measurement information of the light receiving unit 2 that receives and disperses the transmitted light from the measured object M and measures the dispersed light, the operation control process that controls the operation of each unit, and the measurement information of the light receiving unit 2. It is configured by including a control unit 3 or the like as a control unit that executes arithmetic processing or the like for analyzing the internal quality of the object to be measured M, and the objects to be measured M are arranged in a line at a set speed by a conveyor 6 as a conveyor. It is configured to be placed and conveyed in a column shape and sequentially pass through the measurement target points T. Then, with respect to the measured object M located at the measurement target location T, the light projected from the light projecting unit 1 is received by the light receiving unit 2 after passing through the measured object M and the light projecting unit 1 and The light receiving unit 2 is arranged separately on the left and right sides of the measurement target location T.

Next, the structure of each part will be described. As shown in FIG. 2, the light projecting unit 1 is configured to include two light projecting means 10, and the two light projecting means 10 are arranged side by side in a direction along the conveyance direction of the measured object M. Has been done.

Each of the light projecting means 10 is a halogen lamp 1.
2 and a concave reflection plate 13 for reflecting the light from the halogen lamp 12 toward one side, and a collimator lens 15 for collimating the light emitted from the light source 14. , This collimating lens 1
A projection mirror 16 for reflecting parallel light having passed through 5 so as to irradiate the measured object M located at the measurement target location T, that is, toward the measurement target location T, and a projection mirror for projection. The light condensing lens 17 condenses the parallel light reflected by 16 at the measurement target point T. Then, in each light projecting means 10, an irradiation range changing means 21 is provided between the light source 14 and the collimating lens 15, respectively, and each light emitted from each light projecting means 10 toward the measurement target location T. It is configured so that the irradiation range of can be changed and adjusted. Further, the pair of light projecting means 10 is configured to irradiate the measurement target portion T with light from different directions. Specifically, the optical axis of each light projecting means 10 is a plan view. In the above, in the configuration in which it is symmetrical with respect to the central axis in the direction orthogonal to the conveyance direction of the measured object M, and the intersection angle with the central axis is set to 15 degrees.

As shown in FIG. 3, each of the irradiation range changing means 21 comprises an opening forming member 22 and a shield 23. The opening forming member 22 includes a larger opening 22a of the two kinds of light passage openings 22a and 23a, and the light passage opening 22a is on the optical axis of the light emitted from the light projecting means 10. It has been fixed to match. The shield 23 is configured to be reciprocally rotatable about an axis 23c in a direction along the transport direction, and a light passage opening provided in the opening forming member 22 along a circumferential direction about the axis 23c. The aperture 23a has a smaller opening that can further limit the light passing through the opening 22a, and a shield 23b that shields the light passing through the light passage opening 22a provided in the opening forming member 22. Then, by rotating the shield 23, as shown in FIG.
By arranging 3 at the irradiation allowable position G2, the light from the light projecting means 10 can emit two kinds of light passage openings 22a and 23.
After passing through the larger opening 22a of a, the irradiation is performed toward the measurement target point T, and the shield 23 is rotated to open the opening irradiation position G1 as shown in FIG.
The light from the light projecting means 10 is
It passes through the smaller light passage opening 23a of the two kinds of light passage openings 22a and 23a, and is irradiated toward the measurement target location T, and as a result, the light projecting means 10 measures the measurement target location. The irradiation range of the light irradiated toward T can be adjusted in two steps, and further, by rotating the shield 23,
As shown in FIG. 3C, by arranging the light at the shielding position G3, it is possible to shield the light from the light projecting unit 10 from being irradiated to the measurement target location T by the shielding portion 23b.

Further, as shown in FIG. 2, one electric shield drive motor 24 to which a reduction mechanism is added is provided as a drive means, and the rotational drive force of the shield drive motor 24 is applied to each shield 23. Is provided with a connecting shaft 25 for transmitting to each other, and the shield drive motor 24 is controlled by the control unit 3 to integrally rotate the respective shields 23 connected by the connecting shaft 25. Has been done.

As shown in FIG. 1, the light receiving section 2 includes, as light receiving means 11, a light receiving condensing lens 31 for condensing the light to be measured which has passed through the object M to be measured, and a light receiving condensing lens. In the wavelength range (6
Band pass mirror 32 that reflects only light in the range of (00 nm to 1000 nm) upward and allows light of other wavelengths to pass through as it is, an open state that allows the measurement target light reflected upward by this band pass mirror 32 to pass through as it is When the light that has passed through the shutter mechanism 33 and the shutter mechanism 33 that can be switched to a blocking state that blocks the passage of the measurement target light and the shutter mechanism 33 in the open state is incident, the light is dispersed to measure the spectral spectrum data. Spectroscope 34,
A light amount detection sensor 35 for detecting the light amount of light that has passed straight through the bandpass mirror 32 as it is is provided.

The spectroscope 34 is, as shown in FIG. 4, a spectroscopic reflection mirror 3 for reflecting the measurement object light incident from the light entrance.
7, a concave diffraction grating 38 for splitting the reflected measurement target light into light having a plurality of wavelengths, and a light intensity for each wavelength in the measurement target light split by the concave diffraction grating 38 A light receiving sensor 39 for measuring spectrum data is arranged in a dark box 40 made of a light blocking material that blocks light from the outside. The light receiving sensor 39 is composed of a 1024-bit MOS type line sensor that simultaneously receives the light spectrally reflected by the concave diffraction grating 38 for each wavelength and converts it into a signal for each wavelength for output. . Although not described in detail, this line sensor outputs a photoelectric conversion element such as a photodiode for each unit pixel, a capacitor for accumulating the charge obtained by the photoelectric conversion element, and the accumulated charge to the outside. It is configured by incorporating a drive circuit for the like. The charge storage time by the capacitor can be changed externally via a drive circuit.

As shown in FIG. 5, the shutter mechanism 33 has a disk 4 having a plurality of slits 41 formed in a radial pattern.
2 in a state in which the pulse motor 43 is rotated around the axis of the vertical axis, and the light entrance 3 of the dark box 40 is provided.
A transmission hole 44 having substantially the same shape as that of the slit 41 is formed in 6 so that when the slits 41 are vertically overlapped with each other, the slit 41 is in an open state that allows light to pass therethrough, and when the position of the slit 41 is displaced, the slit 41 has a shielded state in which light is blocked. In order to prevent light leakage, the disk 42 is arranged in a state of sliding in close contact with the light entrance 36 of the dark box. That is,
The shutter mechanism 33 is provided in a state of being close to the light entrance 36 for the concave diffraction grating 38.

The light projecting means 10 and the light receiving means 11 are provided in a state of being integrally supported by a frame body 45 provided so as to bypass the upper side of the measurement target point T through which the object to be measured M passes. The frame 45 can be adjusted by the vertical adjustment mechanism 46 so that the overall vertical position of the frame 45 can be adjusted with respect to the conveyor 6. The vertical adjustment mechanism 46 will not be described in detail, but the fixed portion 47
Is installed in a fixed position with respect to the frame moving motor 48
It can be moved up and down by a screw feed mechanism 49 driven by. Then, a reference filter 50, which is an example of a reference body, is provided in a state of being positioned above the passage position of the measurement object M on the transport conveyor 6 and being fixed by the fixing portion 47. The reference filter 50 is composed of an optical filter having a predetermined absorbance characteristic, and is specifically composed of opal glass.

Then, by adjusting the position of the entire frame body 45 in the vertical direction, as shown in FIG.
The normal measurement state in which the light from the light projecting means 10 is received by the light receiving means 11 after passing through the object to be measured M placed on the conveyor 6, and the light projecting means as shown in FIG. 10
It is configured so that it can be switched to the reference measurement state in which the light from is transmitted through the reference filter 50 and then received by the light receiving means 11.

Furthermore, in the normal measurement state, the control unit 3
Based on the size information of the object to be measured M input in advance, the light projecting means 10 and the light receiving means so as to irradiate the object to be measured M with the light projecting means 10 centering on the central portion of the object to be measured M. 11
The shield driving is performed such that the vertical position of the irradiation light is adjusted and the irradiation range of the irradiation light by the light projecting means 10 is increased as the size of the object M to be measured is changed. It is configured to controllably operate the motor 24.

That is, when the size of the object to be measured M is small, as shown in FIG. 7A, the vertical adjustment mechanism 46 and the shield drive motor 24 are operated to move the central part of the object to be measured M. The light projecting means 10 and the light receiving means 1 are arranged so that the irradiation light is evenly applied to the entire measured object M centering around
The vertical position with respect to 1 and the irradiation range of the irradiation light are changed and adjusted. Then, when the size of the measured object M is large, when the size of the measured object M is small by operating the vertical adjustment mechanism 46 and the shield drive motor 24 as shown in FIG. More than that, the up-down adjustment mechanism 46 moves the light projecting means 10 and the light receiving means 11 to the upper side, and operates the shield drive motor 24 to center the central portion of the measured object M and measure the measured object M. The irradiation range of the irradiation light is changed and adjusted so that the irradiation light is uniformly irradiated over the entire area.

That is, the light from the light projecting means 10 is accurately prevented from going around the object M to be measured, and the object M to be measured is uniformly irradiated while being centered on the central portion of the object M to be measured. In order to do so, the vertical position of the light projecting means 10 and the light receiving means 11 and the irradiation range of the irradiation light are changed and adjusted.

Then, the conveyor 6 is constructed so that a bucket 6b for placing an object to be measured is attached to an endless rotating chain 6a at a set interval and is driven to rotate.
As shown in FIG. 5, an optical passage sensor 51 that outputs a detection signal each time the central position of the bucket 6b passes is provided at a position on the upper side in the conveyance direction of the measurement target point T by the conveyance conveyor 6. . That is, the passage sensor 51 functions as a conveyance cycle detection unit that detects the cycle in which the measured object M passes through the measurement target location T.

The control section 3 is constructed by using a microcomputer, and as shown in FIG. 10, a calculation for analyzing the internal quality of the object to be measured M based on the spectral spectrum data obtained by the light receiving means 11. Means 100 and operation control means 101 for controlling the operation of each part are provided in the form of control programs. That is, a calculation process for analyzing the internal quality of the object M to be measured is executed by using a well-known technique such as a spectroscopic analysis method described later, and the rotation operation of the shield drive motor 24, the opening / closing operation of the shutter mechanism 33, and the vertical movement are performed. It is configured to control the operation of each part such as the operation of the adjustment mechanism 46 and the management of the operation of the light receiving sensor 39.

Next, the control operation by the operation control means 101 will be described. The operation control means 101 is an object to be measured M
Prior to the normal measurement for the reference filter 50, the light from the light projecting means 10 is replaced by the object M to be measured.
A reference data measurement mode in which the transmitted light from the reference filter 50 is dispersed by the light receiving means 11 and the spectrum light obtained by receiving the separated light is obtained as the reference spectrum data. Light is emitted from the light projecting means 10 to the measured object M conveyed by the conveyor 6 to obtain measured spectral spectrum data, and based on this measured spectral spectrum data and the reference spectral spectrum data, It is configured to be switchable to a normal data measurement mode for analyzing the internal quality of the measurement object M.

More specifically, in the reference data measurement mode, the vertical adjustment mechanism 46 is operated while the conveyance of the object M to be measured by the conveyor 6 is stopped to move the frame 45 to the reference measurement state. Switch to. Then, the shutter mechanism 33 is switched to the open state, the light from the light projecting means 10 is irradiated to the reference filter 50 in place of the object M to be measured, and the transmitted light from the reference filter 50 is received by the light receiving means 11. The spectral spectrum data obtained by spectrally separating the light is received, and the spectral spectrum data obtained by receiving the dispersed light is measured as the reference spectral spectrum data.

Then, in the reference data measuring mode, the detection value (dark current data) of the light receiving sensor 39 in a non-lighted state in which the light to the light receiving means 11 is shielded is also measured.
That is, the shutter mechanism 33 of the light receiving means 11 is switched to the closed state, and the detection value in each unit pixel of the light receiving sensor 39 at that time is obtained as dark current data.

Next, the control operation in the normal data measurement mode will be described. In this normal data measurement mode, the vertical adjustment mechanism 46 is operated to switch the frame body 45 to the normal measurement state, and the measured object M by the conveyor 6 is measured.
Carry out. Then, based on the information detected by the passage sensor 51, the cycle in which the measured object M passes through the measurement target location T is detected, and in the state synchronized with the cycle, the dispersed light is received and the charge accumulation operation is performed. The operation of the light receiving sensor 39 is controlled so that the charge accumulation process executed for the set time and the sending process for sending out the accumulated charges are repeated at the set cycle. That is, as shown in FIG. 9, in the time zone in which each measured object M is predicted to pass the measurement target point T, the light receiving sensor 39 executes the charge accumulation process for the set time T1, and the measured object M is measured. The measurement target point T is near the intermediate position between the measured objects M that are predicted not to exist at the target point T.
The operation of the light receiving sensor 39 is controlled so as to execute the sending process of sending out the accumulated charges for the set time T2 at the timing of being located at. Therefore, in this measuring device, the charge accumulation time by the light receiving sensor 39 is always constant. When the processing capacity is such that seven objects to be measured M pass through in one second, the set time T1 for executing the charge accumulation process is about 140 msec.

Then, the operation control means 101 switches from the shielded state to the open state and maintains the open state in the state where the light receiving sensor 39 is performing the charge accumulation processing and the light receiving sensor 39 is performing the charge accumulation processing. To keep it for a period of time Tx and then return it to the shielded state,
It is configured to control the operation of the shutter mechanism 33, and is configured to change and adjust the opening maintaining time Tx based on the change command information. This opening maintenance time Tx
Is configured to be changed according to the type of the measured object M. To add a further explanation, for example, if the mandarin orange of Wenshu is relatively easy to transmit light, it takes a relatively short time (10
It is difficult to transmit light in Iyokan, so it is set to a long time (about 30 msec). The operator manually sets the operating conditions depending on the type of product. That is, as shown in FIG. 10, an artificial operation type switching operation tool 52 that artificially switches the setting position according to the difference in product type is provided, and the setting information of the switching operation tool 52 is input to the control unit 3. Control unit 3
Is configured to change and adjust the opening maintenance time Tx according to the setting information.

Further, the operation control means 101, on the basis of the amount of received light detected by the light amount detecting sensor 35, that is, the change in the measured value of the amount of light transmission of the measured object M, the measured object M.
Detects whether or not the object to be measured T has been reached, and when detecting that the object to be measured M has reached, the shutter mechanism 33 is switched to the open state, and the open state is maintained for the open maintenance time Tx. After doing the shutter mechanism 3
3 is switched to the shielded state and the measurement process is ended. Specifically, FIG. 11 shows a change state of the detection value of the light amount detection sensor 35 with the passage of time. The maximum value is output by the light projected from the light projecting means 10 until the measured object M arrives, but when the measured object M reaches the measurement target location T, the measuring light is blocked and the light amount is detected. When the detection value (light reception amount) of the sensor starts to decrease and the detection value decreases to a preset value or less (t
In 1), it is determined that the measured object M has reached the measurement target point T, and when the set time has elapsed from that point (t
In 2), the shutter mechanism 33 is switched to the open state.
Then, after maintaining the open state for the open maintaining time Tx, the shutter mechanism 33 is switched to the closed state.

Then, the arithmetic means 100 executes an arithmetic process for analyzing the internal quality of the object M to be measured by using a spectral analysis method which is a well-known technique based on various data thus obtained. It is configured. That is, the measured spectrum data obtained as described above is
Reference spectral spectrum data obtained in the reference data measurement mode, and normalization using dark current data, to obtain the absorbance spectrum data for each spectral wavelength is dispersed, the second derivative of the absorbance spectrum data Ask for. Then, it is configured to execute an analytical calculation process for calculating the component amount corresponding to the sugar content and the component amount corresponding to the acidity contained in the measured object M by the second derivative. For the absorbance spectrum data d, the reference spectrum data is Rd, the measurement spectrum data is Sd,
If the dark current data is Da,

[0045]

[Equation 1] d = log {(Rd-Da) / (Sd-Da)}

It is calculated by the following equation. Then, the control unit 3 uses the value of the specific wavelength among the values obtained by second-order differentiation of the absorbance spectrum data d thus obtained and the calibration formula shown in the following Expression 2 to measure the object M to be measured. The amount of components contained in is calculated.

[0047]

[Equation 2] Y = K0 + K1 · A (λ1) + K2 · A (λ2)

However, Y: component amount K0, K1, K2; coefficient A (λ1), A (λ2); second derivative of the absorbance spectrum at a specific wavelength λ

A specific component amount calculation formula, specific coefficients K0, K1 and K2, wavelengths λ1 and λ2, etc. are preset and stored for each component for calculating the component amount, and the arithmetic means 100 is stored. Is configured to calculate the component amount of each component using a specific calibration formula for each component.

[Other Embodiment] (1) In the above embodiment,
As the light source, a halogen lamp and a concave light-projecting reflection plate that reflects light from the halogen lamp toward one direction are used, but, for example, instead of the halogen lamp, a mercury lamp or It may be configured to include a Ne discharge tube or the like. Further, a beam light source that irradiates the beam light and can change the irradiation range may be used.

(2) In the above embodiment, the irradiation range changing means is provided between the light source and the collimating lens, but the present invention is not limited to this. For example,
It may be provided between the projection mirror and the projection condenser lens, or may be provided between the projection condenser lens and the measurement target portion.

(3) In the above embodiment, the irradiation range is changed and adjusted by selecting a plurality of types of light passage openings having different opening areas as the irradiation range changing means. However, the present invention is not limited to this. It is not something that will be done. For example,
In the configuration of the above embodiment, an aperture forming member having one light passage opening is provided between the light source and the measurement target portion, and the aperture forming member is moved along the passage direction of the irradiation light. The irradiation range may be changed and adjusted. Further, the irradiation range changing means may have a structure such as a diaphragm of a camera.

(4) In the above embodiment, the light from the light projecting means is focused toward the measurement target location, but the invention is not limited to this. For example, in the light projecting means of the above-described embodiment, a light projecting condensing lens is not provided so that the light projected from the light projecting means to the measurement target area becomes parallel light and is projected. You may Further, the light projecting condenser lens may be replaced with a diffusing lens so that the light emitted from the light projecting means to the measurement target portion becomes diffused light and is emitted.

(5) In the above embodiment, an example in which the shield in the irradiation range changing means is rotationally operated to change the irradiation range and the amount of light reduction has been described. It is also possible to implement by arranging the openings so as to be spaced from each other in the slide movement direction of the slide moving body and sliding the slide moving body to change the irradiation range. Further, the number of the plurality of types of light passage openings is not limited to two as in the above embodiment, and may be appropriately changed to three or more according to the measurement conditions and the like. .

(6) In the above embodiment, the filter made of opal glass is used as the reference body, but the present invention is not limited to this, and any other diffuser plate such as frosted glass may be used as long as it has a predetermined absorbance characteristic. The material is not limited. Further, the light receiving means is not limited to the MOS type line sensor,
Other detection means such as a CCD type line sensor may be used.

(7) In the above embodiment, the spectral spectrum is measured based on the transmitted light from the measured object, but instead of this configuration, the spectral spectrum is measured based on the reflected light from the measured object. It is also possible to configure and implement to measure.

(8) In the above embodiment, sugar content and acidity are exemplified as the internal quality of the object to be measured, but the internal quality is not limited to this.
Other internal qualities such as taste information may be measured.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a spectroscopic analyzer.

FIG. 2 is a plan view of a light projecting unit.

FIG. 3 is a diagram showing a state in which the position of the shield is changed.

FIG. 4 is a block diagram of a spectroscope.

FIG. 5 is a diagram showing a shutter mechanism.

FIG. 6 is a diagram showing a vertical position change state.

FIG. 7 is a diagram showing an irradiation range by a light projecting unit.

FIG. 8 is a plan view showing an installation state of a passage sensor.

FIG. 9 is a timing chart of measurement operation.

FIG. 10 is a control block diagram.

FIG. 11 is a diagram showing changes in received light amount and measurement timing.

FIG. 12 is a perspective view showing a conventional technique.

[Explanation of symbols]

3 control means 10 Projection means 11 Light receiving means 21 Irradiation range changing means 22 Aperture forming member 23 Shield 22a, 23a Light passing aperture 24 Driving means G1 aperture irradiation position G2 irradiation allowable position G3 shield position M object to be measured T measurement target point

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 2G059 AA01 BB11 DD12 EE01 HH01                       HH02 JJ05 JJ11 JJ13 JJ21                       JJ23 KK04 LL04 MM01 MM10

Claims (5)

[Claims] 1. A light projecting means for irradiating an object to be measured located at a measurement target position with light, and a light receiving means for receiving and splitting transmitted light from the object to be measured and measuring the dispersed light. ,
Control means for controlling the operation of each part is provided, the control means, based on the measurement information of the light receiving means,
A spectroscopic analysis device configured to analyze the internal quality of the object to be measured, the irradiation range changing unit changing and adjusting an irradiation range of light emitted from the light projecting unit toward the measurement target location. A spectroscopic analyzer provided with. 2. The spectroscopic analyzer according to claim 1, wherein the irradiation range changing means is provided with a plurality of types of light passage openings having different opening areas so as to be selectively used. 3. The opening forming member, wherein the irradiation range changing means comprises the largest opening of the plurality of types of light passage openings and is installed at a fixed position, and the plurality of types of light passage openings. The opening for irradiation of light other than the largest opening for allowing the light from the light projecting means to be irradiated to the measurement target portion through the light passing opening, and from the light projecting means. Is provided with a shield that is positionally changeable to an irradiation allowable position that does not limit the irradiation range of the light to the measurement target location, and is configured to change and adjust the irradiation range by changing the position of the shield. Item 2. The spectroscopic analyzer according to item 2. 4. The spectroscopic analysis apparatus according to claim 3, wherein the shield is configured to be repositionable also at a shield position that shields the measurement target portion from being irradiated with light from the light projecting unit. 5. A plurality of the light projecting means are provided so as to irradiate the measurement target portion with light from different directions, and the opening forming member and the shield are provided corresponding to the respective light projecting means. The spectroscopic analyzer according to claim 3 or 4, wherein one driving means is provided so as to change the positions of the plurality of shields.