JPH05164691A - Measuring method of content of rice hull in rough rice - Google Patents

Abstract

PURPOSE:To quickly measure the content of rice hulls in a sample of rough rice, and to utilize the measuring data for the drying condition, hulling condition and selecting condition. CONSTITUTION:Near infrared rays are cast to a sample of crushed rough rice and the near infrared spectrum is measured. Then, the measured spectrum is compared with two preliminarily measured near infrared spectra of unpolished rice and rice hulls in the same sample. The content of rice hulls in the sample is obtained on the basis of the comparing result. The comparing value of the spectra of the rough rice, unpolished rice and rice hulls is used as an absorbance at a predetermined wavelength of each spectrum. Moreover, the comparing amount of the near infrared spectra of the rough rice, unpolished rice and rice hulls is the shifting amount of spectra in a predetermined wavelength region.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring the content rate of rice husk contained in a rice husk sample (mixing ratio of rice husk).

[0002]

2. Description of the Related Art Heretofore, it has generally not been time-consuming to calculate the content rate of rice husk contained in rice husks.

[0003]

Therefore, conventionally, it was not possible to promptly know the ripening degree of the paddy, and it was desired to solve the problem. In particular, in a grain drying and preparation facility, the grain filling degree of raw rice is quickly known at the time of arrival, and the raw grain is mixed or separated according to the measurement level, and dried under appropriate conditions according to the grain filling degree. There is a request to hull and sort,
I couldn't meet that request.

Therefore, an object of the present invention is to quickly measure the content rate of rice husks in a paddy sample, and to utilize the measured data for drying conditions, hulling conditions, and selection conditions.

[0005]

In order to achieve the above object, the present invention has the following constitution. That is, in the present invention, a near-infrared spectrum is measured by irradiating a crushed paddy sample with near-infrared rays, and the measured spectra are two known near-infrared spectra of brown rice and rice husk of the same sample obtained by measuring in advance. Compare and determine the rice husk content in the rice sample based on the comparison result
In the present invention, the comparative value of the near-infrared spectrum of the above-mentioned paddy, brown rice, and rice husk is taken as the absorbance at a predetermined wavelength of each spectrum. Furthermore, in the present invention, the comparative amount of the near-infrared spectra of the above-mentioned paddy, brown rice, and rice husk is taken as the shift amount (shift amount) between spectra in a predetermined wavelength range.

[0006]

In the present invention, near-infrared spectrum is measured by irradiating a crushed paddy sample with near-infrared rays. Since the chaff sample is a mixture of brown rice and chaff, the above measurement spectrum has an intermediate property between the two known near-infrared spectra of brown rice and chaff of the same sample, which has been measured in advance, and is dependent on the chaff content. Make a certain change.

Therefore, the present invention pays attention to this point, compares the measured spectrum with two known near-infrared spectra of brown rice and rice husk of the same sample obtained by measuring in advance, and based on the comparison result, Determine the content rate of rice husks in the sample.

[0008]

EXAMPLES Next, examples of the present invention will be described.

In this embodiment, first, a predetermined amount of paddy sample is prepared, and the paddy sample is pulverized into powder. Next, the crushed paddy sample is irradiated with near infrared rays while continuously changing the wavelength, the transmitted light or the reflected light of the paddy sample is detected, and the transmitted light spectrum or the reflected light spectrum is obtained by the detection. Then, a second derivative spectrum is obtained from the obtained original spectrum. These measurement processes are
A known wavelength scanning type near infrared spectrophotometer is used, and the wavelength used is, for example, in the range of 1100 nm to 2500 nm.

On the other hand, prior to these measurement processes, the same paddy sample as described above is hulled in advance to separate it into rice husks and brown rice, which are then separately ground into powder. Then, the same measurement processing as above is performed on each of these samples of rice husk and brown rice, and the near-infrared spectrum and its second derivative spectrum are obtained respectively.

Since the chaff is a mixture of brown rice and chaff, the measured absorbance spectrum of the chaff sample has an intermediate property between the known absorbance spectrum of chaff and the known absorbance spectrum of brown rice. Change to a certain degree. Therefore, as shown in FIG. 1, the second derivative spectrum of the chaff sample has an intermediate property between the second derivative spectrum of the chaff sample obtained in advance and the second derivative spectrum of the brown rice sample obtained in advance. , A certain change according to the rice husk content. Therefore, paying attention to this point, the content rate of rice husks (mixing ratio of rice husks) is determined as follows.

First, as shown in FIG. 2, the measured spectrum of rice has the property of going up and down between the known spectrum of rice husk and the known spectrum of brown rice according to the content of rice husk.
Therefore, by utilizing this property, the rice husk content rate α is obtained, for example, by the following equation (1).

Α = K0 + K1 (OD1-OD2) ^β (1) Here, OD1 in the equation (1) is the absorbance of the paddy spectrum near 1690 nm (mainly the second derivative), and OD2 is 1.
It is the absorbance of the paddy spectrum near 750 nm (mainly the second derivative). Then, K0, K1, and β are constants.

In the equation (1), the wavelength of around 1690 nm is selected because the second-order differential value is paddy, as shown in FIG.
This is because of the common features of brown rice and rice husks. The reason why the wavelength is selected to be near 1750 nm is that the second-order differential value can be discriminated between paddy, brown rice and rice husk, and is not affected by temperature change and water content change.

Next, as shown in FIG. 3, the measurement spectrum of rice has a property that the wavelength shifts (shifts) between the spectrum of known rice husk and the spectrum of known brown rice according to the content of rice husk. .. Therefore, by utilizing the property that the wavelength is shifted, the rice husk content rate α is obtained, for example, by the following equation (2), (3) or (4).

First, the wavelength is 2260 nm to 2290 nm.
When utilizing the extreme value in the region, the rice husk content rate α is calculated by the following equation (2).

Α = (λG1-λM1) / (λG1-λK1) (2) Here, in the equation (2), λK1 is the wavelength of the minimum value of the rice husk spectrum in the above region, and λG1 is the minimum value of the brown rice spectrum. , ΛM1 is the wavelength of the minimum value of the paddy spectrum.

Next, the wavelength is 2300 nm to 2330 nm.
When utilizing the extreme value in the range, the rice husk content rate α is calculated by the following equation (3).

Α = (λM2-λG2) / (λK2-λG2) (3) Here, in the formula (2), λK2 is the wavelength of the minimum value of the rice husk spectrum in the above region, and λG2 is the minimum value of the brown rice spectrum. , ΛM2 is the wavelength of the minimum value of the paddy spectrum.

Further, by utilizing the expressions (2) and (3),
To obtain the rice husk content α by the wavelength difference between both extreme values,
It is calculated by the following equation (4).

Α = (ΔλM-ΔλG) / (ΔλK-ΔλG) = (λM2-λM1)-(λG2-λG1) / (λK2-λK1)-(λG2-λG1) (4) Next When the rice husk content rate α is concretely calculated by the equations (2), (3), and (4) based on FIG. 3, it becomes as follows.

Α = (λG1-λM1) / (λG1-λK1) = (2278.1-2276.4) / (2278.1-2268.5) = 1.7 / 9.6 = 0.18 α = ([Lambda] M2- [lambda] G2) / ([lambda] K2- [lambda] G2) = (2316-2314.2) / (2323.6-2314.2) = 1.8 / 9.4 = 0.19 [alpha] = ([Delta] [lambda] M- [Delta] [lambda] G). /(ΔλK−ΔλG)=(2316−2276.4)−(2314.2−2278.1)/(2323.6−2268.5)−(2314.2−2278.1)=3.5 /19=0.18 As described above, according to the example of the present invention, the content rate of rice husks can be quickly measured. Therefore, if this example is applied to a grain drying and preparing facility, the grain filling degree of raw rice can be improved at the time of receipt. It can be measured quickly.
Therefore, it is possible to mix or separate the raw paddy for receiving in accordance with the measurement level, and then perform the drying, the paddying, and the sorting under appropriate drying conditions, paddying conditions, and selecting conditions.

For example, if it is determined that the degree of ripening is poor, it is estimated that early cutting or variation in grain shape is large,
(1) Performing a gentle drying by lowering the hot air temperature below the standard (2) A high removal rate with variations in grain shape may cause more damage, so the removal rate is below the standard ( 3) Regarding the grain shape selection, it is advantageous because it is possible to know the determination such as selecting the mesh in consideration of the variation of the grain in a relatively early time.

[0024]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, near-infrared spectrum is measured by irradiating a crushed paddy sample with near-infrared light, and the measured spectrum of brown rice and rice husk of the same sample obtained in advance is measured. Compared with two known near-infrared spectra, the rice husk content in the rice husk sample was determined based on the comparison result, so that the rice husk content in the rice husk sample can be measured quickly, and the measured data can be measured under dry conditions. It can be used for hulling conditions and sorting conditions.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a second derivative spectrum of paddy, brown rice, and chaff.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is a partially enlarged view of FIG. 1.

Claims (3)

[Claims] 1. A near-infrared spectrum is measured by irradiating a crushed paddy sample with near-infrared radiation, and the measured spectrum is
A method for measuring the content rate of rice husks in rice husks, which is compared with two known near-infrared spectra of brown rice and rice husks of the same sample obtained by measurement in advance and the content of rice husks in the rice chaff is calculated based on the comparison result. 2. The method for measuring the content rate of rice husks in rice grain according to claim 1, wherein the comparison of the near-infrared spectra of the rice husks, brown rice, and rice husk is the absorbance at a predetermined wavelength of each spectrum. 3. The method for measuring the content rate of rice husks in rice according to claim 1, wherein the comparison of the near-infrared spectra of the rice husks, brown rice, and rice husk is the shift amount between spectra in a predetermined wavelength range.