JPH01250739A - Measuring apparatus of reflectance and transmittance of granular aggregate - Google Patents

Abstract

PURPOSE:To make an apparatus small in size and to dispense with the positional alignment of optical axes and others, by leading a light from a light source onto the surface of a vessel to be measured by two optical fibers. CONSTITUTION:A light from a light source is led onto the surface of a substance to be measured by two optical fiber bundles 10a and 10b, and the fiber bundles 10a and 10b are disposed so that the two optical axes thereof on the size of the substance 2 to be measured intersect each other at prescribed incident angles and from the opposite directions on the surface of the substance 2. Moreover, a reflected light (or a transmitted light) from the surface of the substrate 2 to be measured is led to a light-sensing element 5 (or 7) through a fiber bundle 11 (or 12). First a standard white plate having a reflecting of about 90% is set in place of the substance 2 to be measured, the reflected light is measured, and thereafter the quantity of a transmitted light is measured in the state wherein the white plate is removed. Next, the substance 2 being set, each quantity of the reflected or transmitted light is measured and then the reflectance or the transmittance is measured by computation. This method needs only the alignment of the direction and position of the end part of the optical fiber on the side of irradiation of the light. Since the reflected light or the transmitted light is led to the photo-sensing element by the optical fiber, in addition, it is possible to make an apparatus small in size and simultaneously to dispense with positional alignment and to facilitate an operation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an apparatus for determining the reflectance and transmittance of a granular object such as rice grains to light.

This invention relates to a device for measuring the degree of rice polishing.

[Conventional technology]

FIG. 3 is a schematic diagram of a conventionally developed apparatus for measuring the reflectance and transmittance of granules of yuzu. 2 in the same figure,
The light source 1 and the object to be measured 2 filled with a granular sample are arranged at a distance from each other, and the object 2 to be measured is placed in such a way that the surface of the granular sample is perpendicular to the light source 1.
This inconvenience occurs because the light emitted from the light source 1 is not uniform throughout the entire light source, and a slight shift in the positional relationship between the light source 1 and the object to be measured 2 will cause a large fluctuation in the amount of incident light. To prevent this, a method is taken to prevent the emitted light from the light source 1 from directly reaching the object to be measured 2. In this method, mirrors 3a and 3b are disposed approximately midway between the light source 1 and the object to be measured 2, and in symmetrical positions, and reflect the light emitted from the light source 1 to achieve the same incident angle. The object to be measured 21 is irradiated with light from opposite directions. Moreover, between the light source 1 and the measured object 2,
A lens 4 and a light receiving element 5 are provided, and the lens 4 collects light reflected in a direction perpendicular to the light irradiation surface of the object to be measured 2, and the light receiving element 5 converts the light into an electrical signal. On the other hand, a lens 6 and a light receiving element 7 are provided on the front side of the object to be measured 2 when viewed from the light source 1, so that out of the light that passes through the object to be measured 2,
Light traveling in a direction perpendicular to the light incident plane is focused by a lens 6, and a light receiving element 7 converts this into an electrical signal. In addition, the electrical signals from the light receiving elements 5 and 7 are taken into the light amount detection circuit 8, where they are converted into signals corresponding to the reflectance and transmittance, and the reflectance and transmittance are displayed on the display circuit 9. .

[Problem to be solved by the invention]

The nine conventional particulate matter reflectance and transmittance measuring devices mentioned above are:
Since the light emitted from a single light source was configured to be guided to the measured object using mirrors, the optical path length became long, making the device larger, and it was difficult to narrow down the optical path width using mirrors. However, a problem frequently arises in that delicate positioning is required for each of the lens and the light-receiving element.

In addition, measuring the whiteness of rice grains using unequipped equipment may result in variations in accuracy due to human visual judgment, and it is difficult to automatically measure the degree of polishing, as rice milling machines are devices that generate considerable vibration. However, with conventional devices, it is difficult to accurately measure the polishing degree of rice grains (because disturbances tend to occur in the measurement optical path).

In addition, in order to measure particulate matter using the conventionally used phototrace reflectance and measuring object, it is necessary to measure the particle shape of the particulate matter by placing the light amount in a sample container, which is the object. There are very few spherical particles, and when measuring the light reflectance and transmittance of non-spherical particles such as rice grains, the difference in the degree of filling of the sample container with the particles affects the measurement results. The problem was that it had a big impact.

SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus for measuring the reflectance and transmittance of a particulate matter aggregate, which can reduce the complexity of the apparatus, eliminate the need for delicate alignment of the optical axis, etc., and always be accurate. It is.

[Means for solving problems]

An object of the present invention is to irradiate light emitted from a single light source onto the surface of a traveling measuring object container filled with a particulate aggregate sample from opposite directions at the same angle of incidence, so that the light emitted from the surface of the measuring object container is The reflectance of the granular object is measured based on the signal corresponding to the amount of reflected light reflected in the vertical direction, and the light transmittance of the granular object is measured based on the signal corresponding to the amount of transmitted light transmitted in the vertical direction on the back surface of the object to be measured container. In this device, the light emitted from the light source is guided to the surface of the object to be measured container through two optical fibers, and the optical axis of the light emitted from these optical fibers is aligned with the object to be measured. A device for measuring reflectance and transmittance of a particulate material aggregate, characterized in that the objects to be measured are arranged so as to intersect on the surface of the container, and a photographing mechanism is provided on the measuring object container filled with the particulate sample aggregate. be.

Furthermore, in order to compensate for fluctuations in the measured value due to fluctuations in the light intensity of the light source, the measured value is corrected based on the optical fiber, light receiving element, and light intensity detection circuit that detect the light intensity of the light source, and the output of this light intensity detection circuit. The system is equipped with a measured value correction circuit.

[Effect]

If the light from the light source is guided using two optical fibers as described above, the relative position of the object to be measured and the light source,
Regardless of the length of the optical fiber bundle, it is sufficient to simply align the direction and position of the end of the optical fiber bundle on the side from which the light is emitted, compared to conventional equipment that uses a mirror to illuminate the surface of the container to be measured. This allows the device to be made smaller and eliminates the need for delicate positioning.

In addition, in addition to guiding the light to the surface of the container of the object to be measured, reflected light and transmitted light are also guided to the light-receiving element using optical fiber bundles, making it much more compact than conventional devices that use lenses. At the same time, delicate alignment becomes unnecessary.

Furthermore, by being equipped with a light intensity detection circuit of the light source and a measured value correction circuit, even if the light intensity of the light source changes due to power supply fluctuations or characteristic fluctuations, the reflectance and transmission 'JK? Measurements can always be made accurately, thereby increasing device reliability.

The device for measuring the light transmittance and reflectance of a granular material aggregate according to the present invention is an extremely useful device, especially for measuring the degree of polishing of rice grains. In the past, when this was done manually, there were variations in the filling rate of the granules into the container, which caused variations in the measured values, making it impossible to accurately measure the degree of rice polishing. By equipping the measuring container with a vibration mechanism, it is possible to automatically and accurately measure the degree of polishing of edible rice grains, which can always fill the measuring container with a constant amount if the sample is of the same type. .

〔Example〕

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention. In FIG. 1, the same reference numerals as in FIG. 3 indicate the same elements. Mirrors 3a, 3b and lenses 4, 5 in FIG. 3 are removed, and two optical fiber bundles 1 are replaced instead.
The light emitted from the light source 1 is guided to the surface of the object to be measured using the optical fiber bundle IQa, 10 kl.
The optical axis of the object to be measured 2@ is arranged so that it crosses the surface of the object to be measured 20 from opposite directions at a predetermined angle of incidence, and the reflected light from the surface of the object to be measured 2 is connected to an optical fiber bundle. 11 is used to guide the light to the light receiving element 5, and the transmitted light sound from the object to be measured 2 is guided to the light receiving element 7 using the optical fiber bundle 12.

Note that the optical fiber bundles 10a, 10 used in this example
b, 11 and 12 are optical fibers with a diameter of 10φ and 0.5
Optical fibers with a diameter of φ can be used as a focused optical fiber bundle.

In this case, if the optical fiber bundle 10a and the 10kl container to be measured 2 @(the D1 section is facing in the predetermined direction, there will be no problem in measurement even if the position of the light source 1 changes; As long as the end of the bundle 11, 120 on the side of the container to be measured 2 is perpendicular to the surface of the container to be measured, the other end may be anywhere. Therefore, the positions of the light receiving elements 5, 7 can be arbitrarily selected. Can be done.

Here, as a specific method for measuring reflectance and transmittance, first, a standard white board with a reflectance of about 90% is attached in place of the container 2 to be measured, and the amount of reflected light fe is measured. Next, with this standard white plate removed, the transmitted light 'fIk' is measured. Next, after attaching the object 2 to be measured and measuring the amount of reflected light and transmitted light fit, the reflectance and transmittance are measured by calculation.

FIG. 2 is a schematic diagram of another embodiment of the present invention, and in the figure, the same reference numerals as in FIG. 1 indicate the same elements. Then, the emitted light from the light source 1 is newly guided to the light receiving element 14 using the optical fiber 13, and the light amount detection circuit 15 measures the light t from the light source 1 based on the output of the light receiving element 14. When the output of this light amount detection circuit 15 and the output of the light amount detection circuit 8 that measures the total amount of reflected light and transmitted light are input to the measured value correction circuit 16, this measured value correction circuit 16 adjusts the amount of light caused by the fluctuation of the light amount of the light source 1. This differs from the first cause in that the fluctuations in the measured values of reflectance and transmittance are corrected and applied to the display circuit 9.

According to this configuration, reflectance and transmittance can be measured with high precision even if there are fluctuations in power supply voltage, characteristic fluctuations over time, etc.

Note that phototransistors or photodiodes may be used as the light-receiving elements 5, 7, 14 constituting the above embodiment, and the light amount detection circuits 8, 15 may include DC amplifiers that amplify the output of the light-receiving elements, and the output thereof. It may be configured with a Mu/D converter that converts into a digital signal, and a microprocessor that calculates reflectance and transmittance based on the converted digital data. In addition, the measured value correction circuit 1
6 may be a gain controllable amplifier or a microprocessor. When a microprocessor is used, the functions of the light amount detection circuits 8 and 150 and the measured value correction circuit 16 may be provided in one microprocessor.

Further, in actually winding up this embodiment, a container for the object to be measured was used, which was equipped with a vibration mechanism as shown in the fourth factors (a) to (c).

A glass (2b) is fixed to the bottom, and then rice (2a) is placed on the saucer (2a).
A measuring object container (2) is filled with 2 bottles, a glass (2b) dE is fixed to the lid (2e), and has an opening (2f) at the bottom.
C) Saucer with rice inside (2a) T-lid (2e)
+

This object to be measured container is then installed in the measuring device shown in Figures 1 and 2 to measure the light reflection and transmittance of the rice grain aggregate.In this case, when rice is placed in a saucer, If it is left to the senses of the measurer, the charging rate will not be constant, and if measurements are taken multiple times, there will be differences in the measured values, especially the transmittance value.
) Kumquats are struck and vibrated. Solenoid OB゛? (17a), θ7 b) when ON, and the sides of the object container to be measured (2) are struck.The striking cycle is 5 times/se.
c. The time was set to 1.5, but is not particularly limited. As a result, the area of the glass (2d) constituting the surface of the object to be measured container is set smaller than the next effective measurement range (2d).
The packed density of rice grains in g) was almost constant regardless of the amount of packed rice grains, which did not affect the measurement accuracy and improved the stability of the measurement. Further, the impact mechanism is not limited to the solenoid θ7), and it is preferable to use ultrasonic waves or the like for powder measurement.

〔Effect of the invention〕

Since the reflectance and transmittance measuring device of the present invention is configured as described above, it produces the effects described below.

By guiding the light from the light source using two optical fiber bundles, the direction and position of the optical fiber end on the side from which the light is emitted can be determined.
It is only necessary to align the positions k, thereby making the device more compact as shown in FIG. 9, and eliminating the need for delicate positioning.

By guiding the reflected light and the transmitted light to the light receiving element using optical fibers, the size of the -layer can be reduced, and at the same time alignment can be facilitated.

Further, by providing a positive circuit corresponding to the variation in measured value due to variation in the light amount of the light source, the measurement accuracy and reliability can be improved.

Furthermore, in the present invention, since the container for the object to be measured is provided with a shaking mechanism, the packing density of the particles filled in the container can always be kept constant, and there are almost no fluctuations in the measured values by the measurer. We were able to perform accurate measurements without any problems.

[Brief explanation of the drawing]

Figure 1 is a schematic configuration diagram of one embodiment of the light reflectance and transmission measurement device of the present invention, Figure 2 is a schematic configuration diagram of another example, and Figure 3
The figure is a schematic configuration diagram of a conventional light reflectance and transmittance measuring device, and 4th (a) to 4th (a) to p are an example of an object to be measured attached to the device of the present invention and a schematic example of its vibration mechanism. is shown. DESCRIPTION OF SYMBOLS 1... Light source, 2... Measured object container, 2a... Receiver 1.7.14... Light receiving element, 8, 15... Light amount detection path, 9... Display circuit, 10a, 10b, 11°2.
13...Optical fiber, 17"°° solenoid 118.
...Measurement value correction circuit patent applicant Mitsubishi Rayon Co., Ltd.

Claims (1)

[Claims] Light emitted from a single light source is irradiated from opposite directions at the same angle of incidence onto the surface of a container to be measured filled with a particulate aggregate sample, and the amount of reflected light reflected perpendicularly from the surface of the object to be measured is determined by Measure the reflectance based on the corresponding signal,
In a reflectance and transmittance measuring device that measures transmittance based on a signal corresponding to the amount of transmitted light transmitted perpendicularly to the back surface, the light emitted from the light source is transmitted to the container to be measured using two optical fibers. The granular sample is guided to the surface of the object to be measured, and the optical fibers are arranged so that their optical axes intersect on the surface of the object to be measured, and a vibration mechanism is provided in the object to be measured container filled with the granular sample. Reflectance and transmittance measuring device for particulate matter aggregates.