WO2007105312A1 - Soil inspection system, soil inspection device, soil inspection program, and recording medium - Google Patents

Abstract

A soil inspection system (100) comprises an LED light source (210) having a red LED, a green LED and a blue LED, a light receiving sensor (220) having a red PD, a green PD and a blue PD, a sample cell placing unit (230) for placing a circular test tube (T) thereon, an LED light source drive unit (240), a signal processing unit (250), a control unit (260) for controlling the actions of the LED light source drive unit (240) and the signal processing unit (250), an operation unit for calculating the content of an inspection target component by using the absorption spectrophotometry, and a display unit (320) for displaying information containing the content of the inspection target component calculated by the operation unit. Thus, the soil inspection system (100) can perform the soil inspection in situ without using any expensive analyzing device, and can perform the soil inspection on plural kinds of inspection target components with little dispersion of the inspection results.

Description

 Specification

 Soil inspection system, soil inspection apparatus, soil inspection program and recording medium

 The present invention relates to a soil detection system, a soil detection device, a soil detection program, and a recording medium.

 Background art

 [0002] Soil inspection can be performed on-site without using an expensive analyzer equipped with a spectrophotometer or the like (for example, see Non-Patent Document 1), and soil inspection is performed for a plurality of types of components to be inspected. There are known soil inspection kits capable of performing the above (for example, see Non-Patent Document 2 and Patent Document 1). This soil test kit is used to extract the extract filtrate containing the components to be tested from the soil, the extraction reagent and extraction filter, and the multiple types used to color the test target components contained in the extract filtrate. And a plurality of colorimetric tables (color plates) used to read the content of the test target component.

 FIG. 14 is a diagram for explaining how to use such a soil detection kit 900.

 FIG. 14 is created by adding symbols and the like to the drawing described in Non-Patent Document 1. Fujihira Kogyo To use this soil detection kit 900, first prepare the extraction filter 910 (extraction filter 910A, 910B, 910 (see Fig. 14)). (See Fig. 14 (b).) Next, insert extraction filters 910A, 910B, and 910C and shake (see Fig. 14 (c)). Invert the extraction filter 910, remove the lid of the extraction filter 910A, and filter as it is (see Fig. 14 (d)) to obtain the extracted filtrate.

[0004] Next, the obtained extraction reagent is put into a test tube 920 for color development (see FIG. 14 (e)). Next, pure water and a coloring reagent relating to the test target component are sequentially added to the coloring test tube 920 (see FIGS. 14 (f) and 14 (g)). Next, for example, after standing for 5 minutes, the color density of the color developing solution contained in the color developing test tube 920 is read based on the colorimetric table 930 relating to the component to be inspected (see FIG. 14 (h)). . [0005] According to this soil inspection kit 900, a color developing solution is produced by adding a color developing reagent related to the test target component to the extracted filtrate extracted from the soil to be tested, and the color density of the color developing solution Can be measured based on the colorimetric table for the component to be inspected, so it is possible to measure the content of the component to be inspected. Is possible.

 [0006] Further, according to the soil detection kit 900, the extracted filtrate extracted from the soil to be tested is divided into a plurality of color test tubes, and then the plurality of color test tubes are used. For each test target component, a corresponding color reagent is added to cause color development to produce a color developing solution, and the color density of the color developing solution is read based on the corresponding colorimetric table, so that multiple types of test target components can be obtained. It becomes possible to measure the content of.

 [0007] For this reason, the soil detection kit 900 can perform soil inspection on-site without using an expensive analyzer, and can perform soil inspection for a plurality of types of inspection target components. It becomes a soil inspection kit that can.

 [0008] However, the above-described soil inspection kit 900 has a problem that variation in inspection results is large because it is necessary for a person to perform a procedure for reading the color density.

 [0009] Incidentally, a water quality tester that measures the water quality by reading the color density using a simple digital absorptiometer composed of an LED and a light receiving sensor is known (for example, see Non-Patent Document 3).

 [0010] Therefore, using the soil inspection kit 900 described in Non-Patent Document 2 or Patent Document 1, a color developing solution is prepared for each of a plurality of types of components to be inspected, and the color density of these color developing solutions is determined in Non-Patent Document 3 If the water quality tester described in 1 is used, it will be possible to reduce the variation in the results of the test because it is not necessary for the person to perform the procedure for reading the color density.

 [0011] Patent Document 1: Japanese Utility Model Publication No. 41922

 Non-patent document 1: Soil .Crop body total analysis device SFP-3, [online], Fujihira Industry Co., Ltd., [Search on February 1, 2005], Internet <URL: http: 〃 www.fhjihira.co .jp / spect ro% 20photometer.htm

Non-Patent Document 2: New soil nutrient tester / Dr. Soil / Instruction Manual, Fujihira Industry Co., Ltd. Company

 Non-Patent Document 3: Digital Pack Test Single Item Water Quality Analyzer, [online], Kyoritsu Riken Laboratories, [Search January 22, 2005], Internet URL: http: 〃 kyoritsu-lab.co.jp/ pack / dpm.html>

 Disclosure of the invention

 Problems to be solved by the invention

 However, the water quality tester described in Non-Patent Document 3 is originally a single-item water quality tester for measuring the content of one test target component, and includes a plurality of types of test target components. It is not a measure of the content of.

 [0013] In addition, the water quality detector described in Non-Patent Document 3 is configured to measure the amount of light using one single-color LED (light emitting diode) and one light receiving sensor. Even if you try to measure the content of multiple types of components to be inspected using an inspection device, depending on the color developing solution, the wavelength range where the color developing solution absorbs little light (or the wavelength range where the color developing solution absorbs light only weakly) Therefore, a soil inspection system that measures the content of multiple types of components to be inspected using the water quality tester described in Non-Patent Document 3 may be configured. The problem that is difficult.

 [0014] Therefore, the present invention has been made to solve such a problem, and it is possible to perform a soil inspection on-site without using an expensive analysis device, and a plurality of types of inspection objects. The purpose of the present invention is to provide a soil inspection system capable of performing a soil inspection according to the components and having a small variation in inspection results. It is another object of the present invention to provide a soil inspection apparatus, a soil inspection program, and a recording medium that can be suitably used for such a soil inspection system.

 Means for solving the problem

[0015] (1) The soil detection system of the present invention includes an LED light source having a red LED, a green LED, and a blue LED that can independently emit light, and a red PD and a green PD that can independently measure the received light intensity. And a light receiving sensor having a blue PD, a sample cell placement portion for placing a sample cell, which is disposed between the LED light source and the light receiving sensor, the red LED, the green LED, and the blue LED. LED light source driving unit for driving the light receiving sensor and the light receiving sensor A signal processing unit including an amplifier that amplifies the output analog output signal, an AD conversion element that converts the analog output signal amplified by the amplifier into a digital signal, and outputs the digital signal; and the LED light source driving unit and the signal processing unit A control unit for controlling the operation, a calculation unit for calculating the content of the component to be inspected from the digital signal using an absorptiometry, and information including the content of the component to be inspected calculated by the calculation unit. A display unit for displaying is provided.

 [0016] For this reason, according to the soil detection system of the present invention, if a color developing solution is made using a soil detection kit or the like and a sample cell containing the color developing solution is mounted on the sample cell mounting portion, the LED By measuring the amount of light using a light source and a light receiving sensor, the color density of the color developer can be read. As a result, it is not necessary for the person to perform the procedure for reading the color density, and thus the variation in the inspection result can be reduced.

 [0017] Further, according to the soil inspection system of the present invention, the content of the test target component is calculated by performing light quantity measurement using a light receiving sensor having red PD, green PD, and blue PD. Is possible. As a result, it is no longer necessary to use a spectrophotometer, and soil inspection can be performed on-site without using an expensive analyzer.

 [0018] Further, according to the soil inspection system of the present invention, the content of a plurality of types of test target components is calculated by reading the color density of the color developing solution for each test target component and calculating the content of the test target component. The amount can be measured. In this case, the color developing solution is considered to absorb light sufficiently in at least one of the three wavelength regions of red, green, and blue, so that the three colored lights (red) as in the soil inspection system of the present invention. By measuring the amount of light using light, green light, and blue light), it is possible to calculate the content of any component to be inspected.

 [0019] Therefore, the soil inspection system of the present invention can perform soil inspection on-site without using an expensive analyzer, and perform soil inspection for a plurality of components to be detected. It is a soil detection system that can perform inspection and has a small variation in inspection results.

In the soil inspection system of the present invention, PD is a photodiode. [0021] In the soil inspection system of the present invention, when calculating the content of the component to be inspected from the digital signal using the absorptiometry, the calculation unit converts the color density to the absorbance and then the component to be inspected. The content of the test component may be calculated, or the content of the test target component may be calculated after converting the color density to the transmittance.

 [0022] In the soil inspection system of the present invention, the content of the test target component may be calculated using a relational expression indicating the relationship between the color density and the content of the test target component. However, the content of the inspection target component may be calculated by appropriately referring to a relation table showing the relationship between the color density and the content of the inspection target component.

 (2) The soil inspection apparatus of the present invention includes an LED light source having a red LED, a green LED, and a blue LED that can independently emit light, and a red PD, a green PD, A light receiving sensor having a blue PD; a sample cell placing portion for placing a sample cell; and the red LED, the green LED and the blue LED, disposed between the LED light source and the light receiving sensor. A signal processing unit including an LED light source driving unit, an amplifier that amplifies an analog output signal from the light receiving sensor, and an AD conversion element that converts the analog output signal amplified by the amplifier into a digital signal and outputs the digital signal A control unit for controlling operations of the LED light source driving unit and the signal processing unit, and an interface unit for outputting the digital signal to an external computer.

[0024] Therefore, according to the soil inspection apparatus of the present invention, an external converter set to execute the procedure of calculating the content of the component to be inspected from the digital signal using the absorptiometry, By connecting the soil inspection apparatus of the present invention, it becomes possible to configure the soil inspection system of the present invention, and accordingly, the effects of the soil inspection system of the present invention are provided as they are.

 [0025] (3) In the soil inspection apparatus of the present invention, it is preferable that the sample cell mounting portion is configured to mount a round test tube as the sample cell. Les.

[0026] By the way, when performing light quantity measurement for the absorptiometric method, in order to perform accurate light quantity measurement under the same conditions for each color while keeping the optical path length constant for each color, a square cell having a rectangular cross section is usually used. There is a problem due to the use of the square cell. [0027] That is, when a square cell is used, there is a problem that the sample is not easily adjusted (the color development time is long because shaking is difficult). In fact, in the water quality tester described in Non-Patent Document 3, a sample of water that is inspected in a rectangular cell is sucked into a polytube containing a reagent related to the component to be inspected and colored to develop a color solution. After that, the complicated operation of returning the coloring solution to the square cell is required. In addition, when a square cell is used, there is a problem that it is not easy to clean the used square cell (it is difficult to clean the inside of the square cell).

 [0028] On the other hand, in the soil inspection apparatus of the present invention, the use of a round test tube having a circular cross section instead of the square cell facilitates sample adjustment in the sample cell (vibration). The color development time can be shortened because it is easy to shake.) The sample cell that has been used can be easily cleaned (internal cleaning is easy). In this case, by configuring as described in the following (4) to (6), it is possible to perform accurate light quantity measurement under substantially the same conditions for each color.

 (4) In the soil inspection apparatus of the present invention, it is preferable that the LED light source further includes a lens portion containing a light diffusing material.

 [0030] By configuring in this way, red light emitted from the red LED, green light emitted from the green LED, and blue light emitted from the blue LED are uniformly diffused in the lens unit, The LED light source emits light under almost the same conditions (angle dependence of intensity distribution and position dependence of intensity distribution are almost the same). As a result, it is possible to perform accurate light quantity measurement under almost the same conditions for each color.

 [0031] (5) In the soil inspection apparatus of the present invention, the central axis of the round test tube in which each color light from the red LED, the green LED, and the blue LED is placed on the sample cell placement portion It is preferable to further include a black light guide member having a light guide portion for guiding each color light from the LED light source to the round test tube so as to pass across.

With this configuration, the beam diameter and divergence angle of each color light emitted by the black light guide member force can be reduced, and the direction perpendicular to the light incident surface of the round test tube Each color light is incident on the round test tube, and each color light can be emitted along a direction perpendicular to the light exit surface of the round test tube. Sufficiently suppress the occurrence of undesirable refraction, and each color has the same accuracy under almost the same conditions. It becomes possible to perform a good light quantity measurement.

 (6) In the soil inspection apparatus of the present invention, the red PD, the green PD, and the blue PD have substantially the same planar shape and are placed on the sample cell placement unit. Are preferably arranged along a direction parallel to the central axis of the round test tube.

 [0034] With this configuration, even when there is a bias in the optical path of each color light in a plane perpendicular to the central axis of the round test tube, the effect of this bias is reduced and the accuracy is maintained under almost the same conditions for each color. It is possible to perform a good light quantity measurement.

 [0035] (7) In the soil inspection apparatus of the present invention, the control unit is configured such that the red LED emits light, the first output of the red PD in a period when the red LED does not emit, and the period in which the red LED emits light The second output of the red PD, the first output of the green PD during the period when the green LED is not emitting light, the second output of the green PD during the period when the green LED is emitting light, and the blue LED The LED light source driving unit and the signal so as to output the first output of the blue PD during a period of not emitting light and the second output of the blue PD during a period of emission of the blue LED as the digital signal. It is preferable to control the operation of the processing unit.

 [0036] By configuring in this way, it becomes possible to measure the received light intensity in the LED non-lighting period and the LED lighting period for each color light, and by taking the difference between these received light intensity in the subsequent stage, It is possible to reduce the influence of background light that leaks into the soil inspection apparatus, and it is possible to measure the light quantity with higher accuracy.

 [0037] In addition, this means that the light shielding structure in the soil inspection apparatus can be made simpler, and the color density in the soil inspection apparatus can be easily read. This makes it possible to construct a soil inspection device that is easy to use.

 [0038] (8) In the soil inspection apparatus of the present invention, the LED light source driving unit does not overlap the red LED, the green LED, and the blue LED with respect to time, and is not necessary. It preferably has a function of emitting light.

[0039] By configuring in this way, it is possible to perform the light quantity measurement for each color light independently, so it is possible to eliminate the interference from other color lights and perform a more accurate light quantity measurement. It becomes. [0040] (9) In the soil inspection apparatus of the present invention, it is preferable that the LED light source driving unit has a function of independently controlling emission intensity of the red LED, the green LED, and the blue LED.

 [0041] By the way, with a soil inspection device, the color density is relatively high, the color liquid is relatively low, the color density is wide, and the range (dynamic range) is accurate. It is desirable to measure the amount of light. However, when measuring the amount of light for a coloring solution with a relatively high color density, the output of the PD is reduced and the SN ratio is reduced. In other words, when measuring the light intensity of a color developing solution with a low color density, it is not easy to widen the dynamic range because the PD output becomes too large and distorted.

 [0042] On the other hand, the soil inspection apparatus of the present invention has a function of independently controlling the emission intensity of each color LED, so that the LED emits light with the optimum emission intensity for each color according to the color density. It becomes possible to make it. For this reason, it is possible to accurately measure the light amount over a wide range (dynamic range) from a coloring solution having a relatively high color density to a coloring solution having a relatively low color density.

 [0043] (10) In the soil inspection apparatus of the present invention, the amplifier includes an analog signal amplification factor from the red PD, an analog signal amplification factor from the green PD, and an analog signal from the blue PD. It is preferable to have a function of independently controlling the gain of each.

 [0044] For this reason, according to the soil inspection apparatus of the present invention, the amplifier has a function of independently controlling the amplification factor of the analog signal from each color PD, so that it is optimal for each color according to the color density. It becomes possible to amplify an analog signal with an amplification factor. As a result, it is possible to accurately measure the light amount over a wide range (dynamic range) from a coloring solution having a relatively high color density to a coloring solution having a relatively low color density.

 [0045] (11) The soil inspection apparatus of the present invention preferably has a function of holding a colorimetric table (color plate) between the LED light source and the light receiving sensor.

[0046] By the way, when the soil inspection device is used for a long period of time, the reading accuracy of the color density deteriorates due to changes in the LED light source characteristics, PD characteristics, amplifier characteristics, AD conversion element characteristics, etc. As a result, the reliability of soil inspection may be reduced. [0047] On the other hand, according to the soil inspection apparatus of the present invention, in such a case, the reading accuracy of the color density is deteriorated by appropriately measuring the amount of light while holding the colorimetric table. By checking the strength, it is possible to suppress a decrease in the reliability of soil inspection.

 [0048] Further, according to the soil inspection apparatus of the present invention, in the above case, the soil inspection apparatus can be used over a long period of time by appropriately measuring the amount of light while holding the colorimetric table for calibration. Even in this case, it is possible to suppress the deterioration of the accuracy of the soil detection by suppressing the deterioration of the color density reading accuracy.

 In this case, the calibration is performed by rewriting a relational expression indicating the relationship between the color density and the content of the component to be inspected or a relation table indicating the relationship between the color density and the content of the component to be inspected.

 [0050] (12) A soil inspection program of the present invention is a soil inspection program for operating an external computer that constitutes the soil inspection system of the present invention together with the soil inspection device of the present invention, A first step in which the external computer transmits a light quantity measurement request for causing the soil inspection apparatus to perform a predetermined light quantity measurement operation to the soil inspection apparatus; and A second step of receiving the digital signal to be output; a third step in which the external computer calculates the content of the component to be inspected from the digital signal using absorptiometry; and the external computer A soil inspection program in which a procedure for executing a fourth step for displaying information including the content of the component to be inspected on a display unit is recorded.

 [0051] Therefore, the soil inspection program of the present invention can be installed in an external computer, and the soil inspection system of the present invention can be configured by connecting the soil inspection apparatus of the present invention to the external computer. Along with this, the effects of the soil detection system of the present invention are maintained as they are.

[0052] (13) In the soil inspection program of the present invention, the light quantity measurement request transmitted to the soil inspection device in the first step is the red color when a control solution is placed in the sample cell. The first output of the red PD when the LED is not emitting light, the second output of the red PD when the red LED is emitting light, and the green LED is emitting light The first output of the green PD during the period, the second output of the green PD during the period when the green LED emits light, and the blue PD during the period when the blue LED does not emit light. The first output and the second output of the blue PD during the period during which the blue LED emits light, and the red LED during the period when the red LED does not emit light when the test solution is put into the sample cell. Third output of PD, the fourth output of red PD during the period when the red LED emits light, the third output of the green PD during the period when the green LED does not emit light, the green LED The fourth output of the green PD during the period when the blue LED is emitting, the third output of the blue PD during the period when the blue LED is not emitting, and the fourth output of the blue PD during the period when the blue LED is emitting light And measure the measurement results to the external computer. The request is preferably transmitted to the data.

 [0053] With this configuration, it is possible to measure the received light intensity during the LED non-lighting period and the LED lighting period for each color. In addition, it is possible to reduce the influence of background light leaking into the soil inspection apparatus, and it is possible to perform light quantity measurement with higher accuracy.

 [0054] In addition, this means that the light shielding structure in the soil inspection apparatus can be made simpler, and the color density in the soil inspection apparatus can be easily read. This makes it possible to construct a soil inspection device that is easy to use.

 [0055] Further, by configuring in this way, the measurement error due to the dispersion of the sample cells and the presence of turbid components contained in the color developing solution is reduced by measuring the received light intensity of both the control solution and the test solution. Therefore, it is possible to measure the light quantity with higher accuracy.

 [0056] As the control solution, in addition to pure water and tap water, an extract filtrate before adding the coloring reagent can be preferably used. As the sample cell for containing the control solution and the sample cell for containing the test solution, the same sample cell can be used, or different sample cells can be used.

When the control solution is put into the sample cell, the light quantity measurement is usually performed only once. However, when the light quantity measurement is performed for a long time, it is also preferable to perform the light quantity measurement several times at an appropriate timing. [0057] (14) In the soil inspection program of the present invention, in the third step, the control data on the red light obtained by subtracting the first output of the red PD from the second output of the red PD, The transmittance T of the red light is determined from the inspection data for the red light obtained by subtracting the third output of the red PD from the fourth output of the red PD, and the green light

 R

 Control data for green light obtained by subtracting the first output of the green PD from the second output of the color PD and obtained by subtracting the third output of the green PD from the fourth output of the green PD. The transmittance T of green light is determined from the inspection data about the green light

 G

 Control data for blue light obtained by subtracting the first output of the blue PD from the second output of the blue PD and obtained by subtracting the third output of the blue PD from the fourth output of the blue PD Blue light transmittance T is determined from the blue light inspection data.

 B

 The transmittance T of the red light, the transmittance T of the green light T, and the transmittance of the blue light

 R G

 It is preferable to calculate the content of the component to be inspected using at least one of T.

B

 That's right.

 [0058] It is considered that the color developing solution sufficiently absorbs light in at least one of the three wavelength ranges of red, green, and blue. For this reason, by calculating the content of the component to be inspected using at least one transmittance of the three color lights (red light, green light, and blue light) in this way, what kind of component to be inspected is determined. However, the content can be calculated.

 [0059] Of course, in this case, if possible, it is more preferable to calculate the content of the component to be inspected using the transmittance of two or three colored lights. By configuring in this way, it becomes possible to perform more reliable soil inspection.

 [0060] (15) In the soil inspection program of the present invention, in the third step, the red light transmittance T, the green light transmittance T, and the blue light transmittance T are summed.

 R G B

 The value of the red light transmittance T relative to the total value T is defined as a relative red light transmittance T ′

 SUM R R

 The transmittance of the green light with respect to the total value τ

 SUM τ value relative green light transmittance

 G τ '

 G

 The blue light transmittance T with respect to the total value T is defined as a relative blue light transmittance T ′.

 SUM B B

 Relative red light transmittance T ′, relative green light transmittance T ′ and relative blue light transmittance T ′.

 R G B

It is preferable to calculate the content of the examination target component using at least one of [0061] With this configuration, the content of the component to be inspected is calculated using the relative transmittance, so that a more reliable soil inspection can be performed.

[0062] In this case, relative red light transmittance T ', relative green light transmittance T' and relative blue light transmission

 R G

 It is more possible to calculate the content of the inspection target component using at least two of the rates T ′

B

 Preferred relative red light transmittance T ', relative green light transmittance T' and relative blue light transmittance T

 R G

 More preferably, the content of the examination target component is calculated using three of '.

 B

 By comprising in this way, it becomes possible to perform soil detection with higher reliability.

[0063] (16) The recording medium of the present invention is a recording medium on which the soil inspection program of the present invention is recorded.

 [0064] For this reason, the soil detection program recorded on the recording medium of the present invention is installed in an external computer, and the soil detection apparatus of the present invention is connected to the external computer. It becomes possible to configure a soil inspection system, and accordingly, the soil inspection system of the present invention has the same effect.

 [0065] As the recording medium of the present invention, a disk type recording medium such as FD, CD, CD-R, DVD, DVD-R, or a semiconductor memory type recording medium such as a flash memory can be suitably used. In addition, the recording medium of the present invention can be distributed by being bundled with a soil inspection apparatus.

 Brief Description of Drawings

 FIG. 1 is a diagram for explaining a soil detection system 100 and a soil inspection device 200 according to Embodiment 1.

 FIG. 2 is a block diagram for explaining a soil inspection apparatus 200 according to Embodiment 1.

 [Fig. 3] Fig. 3 is a diagram showing a main part of a soil inspection apparatus 200 according to Embodiment 1.

 FIG. 4 is a diagram shown for explaining the operation of the control unit 260 in the soil inspection apparatus 200 according to the first embodiment.

 FIG. 5 is a diagram for explaining the operation of the control unit 260 in the soil inspection apparatus 200 according to the first embodiment.

FIG. 6 is a view for explaining the operation of the control unit 260 in the soil inspection apparatus 200 according to the first embodiment. FIG. 7 is a view for explaining how to use a slit 290 in the soil inspection apparatus 200 according to the first embodiment.

 FIG. 8 is a flowchart for explaining the soil inspection program according to the first embodiment.

 FIG. 9 is a diagram showing an example of a display screen displayed on display section 320.

 FIG. 10 is a graph showing the relationship between color density and Mn content in Example 1.

 FIG. 11 is a graph showing the relationship between the color density and the content of NO_N in Example 2.

 Three

 FIG. 12 is a perspective view for explaining a soil inspection system 102 according to Embodiment 2.

FIG. 13 is a block diagram for explaining a soil detection system 102 according to a second embodiment.

 FIG. 14 is a diagram for explaining how to use the soil detection kit 900.

 BEST MODE FOR CARRYING OUT THE INVENTION

 Hereinafter, a soil inspection system, a soil inspection apparatus, a soil inspection program, and a recording medium according to the present invention will be described based on the embodiments shown in the drawings.

 [0068] [Embodiment 1]

 FIG. 1 is a diagram for explaining a soil detection system 100 and a soil detection device 200 according to the first embodiment. FIG. 1 (a) is a perspective view showing the external appearance of the soil detection system 100, and FIG. 1 (b) is a perspective view of the main part of the soil detection device 200 as viewed obliquely from below. FIG. 2 is a block diagram for explaining the soil detection device 200 according to the first embodiment. FIG. 3 is a diagram illustrating a main part of the soil inspection apparatus 200 according to the first embodiment. Fig. 3 (a) is a top view of the main part of the soil detection device 200, Fig. 3 (b) is a cross-sectional view of the main part of the soil detection device 200, and Fig. 3 (c) is an LED light source 210. FIG. 3D is a schematic view of the light receiving sensor 220 viewed from the LED light source 210 side.

 [0069] In FIG. 1 (b) and FIG. 3, the three directions orthogonal to each other are the z-axis directions.

 (Direction from LED light source 210 toward light receiving sensor 220), y-axis direction (direction along the central axis of round test tube T), and X-axis direction (direction orthogonal to z-axis and y-axis).

[0070] A soil inspection system 100 according to Embodiment 1 includes a soil inspection apparatus 2 as shown in FIG. 00 (soil testing apparatus 200 according to Embodiment 1), an external computer 300, and a connection cord 330 for connecting them.

 [0071] As shown in Figs. 2 and 3, the soil inspection apparatus 200 according to Embodiment 1 includes an LED light source 210 having a red LED 212R, a green LED 212G, and a blue LED 212B that can independently emit light, and a light receiving intensity independently of each other. A light receiving sensor 220 having a red PD222R, a green PD222G and a blue PD222B capable of measuring a light source, and a sample for mounting a round test tube T as a sample cell, disposed between the LED light source 210 and the light receiving sensor 220. Cell mounting unit 230, LED light source driver 240 that drives red LED 212R, green LED 212G, and blue LED 212B, and analog output amplified by amplifier 252 and amplifier 252 that amplify the analog output signal from light receiving sensor 220 A signal processing unit 250 including an AD conversion element 254 that converts the signal into a digital signal and outputs it, a control unit 260 that controls the operation of the LED light source driving unit 240 and the signal processing unit 250, and the digital signal to the external computer 300 And an interface section 270 for force.

 A light shielding plate 224 is disposed on the LED light source 210 side of the light receiving sensor 220. A black light guide member 216 is disposed on the light receiving sensor 220 side of the LED light source 210.

 [0073] The external computer 300 uses an absorptiometric method to calculate the content of the inspection target component from the digital signal, and the content of the inspection target component calculated by the calculation unit 310. A display unit 320 (see FIG. 1 (a)) for displaying information including.

 [0074] For this reason, according to the soil inspection system 100 according to the first embodiment, the color test liquid T is prepared using the soil test kit or the like, and the round test tube T containing the color development liquid is mounted on the sample cell mounting unit 230. In this case, the color density of the color developing solution can be read by measuring the light amount using the LED light source 210 and the light receiving sensor 220. As a result, it is not necessary for the person to perform the procedure of reading the color density, and thus it is possible to reduce the variation in the inspection results.

[0075] Further, according to the soil detection system 100 according to the first embodiment, the light quantity measurement is performed using the light receiving sensor 220 having the red PD222R, the green PD 222G, and the blue PD222B. The content can be calculated. As a result, there is no need to use an expensive and heavy spectrophotometer, so there is no need to use an expensive analyzer. Soil inspection can be performed.

 [0076] Furthermore, according to the soil inspection system 100 according to Embodiment 1, a plurality of types of inspection target components are calculated by calculating the content of the inspection target component by reading the color density of the color developing solution for each inspection target component. It becomes possible to measure the content of. In this case, the color developing solution is considered to sufficiently absorb light in at least one of the three wavelength ranges of red, green, and blue. Therefore, the color developing solution has three types as in the soil detection system 100 according to the first embodiment. By measuring the amount of light using colored light (red light, green light and blue light), it is possible to calculate the content of any component to be examined.

 [0077] For this reason, the soil detection system 100 according to Embodiment 1 can perform soil inspection on-site without using an expensive analyzer, and the soil can be detected for a plurality of components to be detected. It is a soil detection system that can perform the inspection, and the soil inspection system has a small variation in the inspection result.

 In the soil inspection system 100 according to the first embodiment, the calculation unit 310 converts the color density to the absorbance when calculating the content of the component to be inspected from the digital signal using the absorptiometry. The content of the component to be inspected may be calculated from, or the content of the component to be inspected may be calculated after converting the color density to the transmittance.

 [0079] In the soil inspection system 100 according to the first embodiment, the content of the test target component may be calculated using a relational expression indicating the relationship between the color density and the content of the test target component. However, the content of the test target component may be calculated by referring to the relationship table showing the relationship between the color density and the content of the test target component as appropriate.

 [0080] According to the soil inspection apparatus 200 according to Embodiment 1, the soil inspection system 100 described above is configured by connecting the soil inspection apparatus 200 to the external converter 300. This has the same effect as the soil inspection system 100.

 In the soil inspection apparatus 200 according to the first embodiment, as shown in FIGS. 2 and 3, the sample cell mounting section 230 is configured to mount a round test tube T as a sample cell. Has been

[0082] For this reason, according to the soil inspection apparatus 200 according to the first embodiment, the sample in the sample cell can be adjusted by using the round test tube T instead of the square cell as the sample cell. easily (Because it is easy to shake, the color development time can be shortened.) The used sample cell can be easily cleaned (internal cleaning is easy).

 In the soil inspection apparatus 200 according to Embodiment 1, the LED light source 210 further includes a lens unit 214 containing a light diffusing material 215, as shown in FIG. 3 (c).

 Therefore, according to the soil inspection apparatus 200 according to the first embodiment, any one of the red light emitted from the red LED 212R, the green light emitted from the green LED 212G, and the blue light emitted from the blue LED 212B is selected. The light is uniformly diffused by the lens unit 214 and is emitted from the LED light source 210 under substantially the same conditions (the angle dependence of the intensity distribution and the position dependence of the intensity distribution are substantially the same). As a result, it is possible to perform accurate light quantity measurement under almost the same conditions for each color.

 [0085] In the soil inspection apparatus 200 according to Embodiment 1, as shown in FIGS. 3 (a) and 3 (b), each color light from the red LED 212R, the green LED 212G, and the blue LED 212B is placed on the sample cell. Black light guide member 216 having a light guide portion for guiding each color light from LED light source 210 to round test tube T so as to pass across the central axis of the round test tube couch placed on section 230 Is further provided.

 [0086] For this reason, according to the soil inspection apparatus 200 according to Embodiment 1, it is possible to reduce the beam diameter and the divergence angle of each color light emitted from the black light guide member 216, and the round test tube. Directional force perpendicular to the light incident surface of T Because each color light is incident and each color light can be emitted along the direction perpendicular to the light emission surface of the round test tube T, It is possible to sufficiently measure the amount of light with high accuracy under substantially the same conditions for each color by sufficiently suppressing the occurrence of undesired refraction of each color light on the light incident surface and light exit surface.

 In the soil inspection apparatus 200 according to Embodiment 1, as shown in FIG. 3 (d), the red PD2 22R, the green PD222G, and the blue PD222B have substantially the same planar shape, and the sample cell. They are arranged along a direction (y-axis direction) parallel to the central axis of the round test tube T placed on the placement unit 230.

[0088] Therefore, according to the soil inspection apparatus 200 according to the first embodiment, even when there is a deviation in the optical path of each color light in a plane perpendicular to the central axis of the round test tube T, the influence of this deviation is affected. Therefore, it is possible to perform accurate light quantity measurement under substantially the same conditions for each color. Note that the light receiving sensor 220 has a structure in which the red PD222R, the green PD222G, and the blue PD222B are arranged in a substantially square area of lm m square.

 FIG. 4 is a diagram shown for explaining the operation of the control unit 260 in the soil inspection apparatus 200 according to the first embodiment. Fig. 4 (&) is a waveform diagram showing the emission timing and emission intensity of red 1 ^ 0212 green LED 212G and blue LED 212B, and Fig. 4 (b) is a waveform diagram showing the output voltage from amplifier 252. 4 (c) is an enlarged view of the portion indicated by the symbol A in FIG. 4 (b).

 In the soil inspection apparatus 200 according to the first embodiment, as shown in FIG. 4, the control unit 260 performs the first output P, red of the red PD 222R during the period when the red LED 212R is not emitting light.

 R1 color Red LED222R second output P during green LED212R emission period, green LED

 R2

 First output P of green PD222G during the period when 212G is not emitting light, green LED212

 G1

 Green PD222G second output P and blue LED212B emit during G light emission

 G2

 The blue PD222B first output P and blue LED212B are emitted during periods of no light.

 B1

 Outputs the second output P of the blue PD222B as a digital signal during the illumination period.

 B2

 The operation of the LED light source driving unit 240 and the signal processing unit 250 is controlled as described above.

[0092] For this reason, according to the soil inspection apparatus 200 according to Embodiment 1, it is possible to measure the received light intensity in the LED non-lighting period and the LED lighting period for each color light. By taking the difference in intensity, it becomes possible to reduce the influence of background light that leaks into the soil inspection apparatus 200, and it is possible to perform light quantity measurement with higher accuracy.

 [0093] In addition, this means that the light shielding structure in the soil inspection apparatus 200 can be made simpler, and the color density reading in the soil inspection apparatus 200 can be made easier. And it is possible to configure an inexpensive and easy-to-use soil inspection device.

In the soil inspection apparatus 200 according to the first embodiment, as shown in FIG. 4 (a), the LED light source driving unit 240 does not overlap the red LED 212R, the green LED 212G, and the blue LED 212B in time. And, it has a function of emitting light intermittently.

[0095] Therefore, according to the soil inspection apparatus 200 according to the first embodiment, the light quantity measurement in each color light. Therefore, it is possible to measure the light quantity with higher accuracy by eliminating interference from other color lights.

 FIG. 5 is a diagram for explaining the operation of the control unit 260 in the soil inspection apparatus 200 according to the first embodiment. Fig. 5 (&) is! ^ 0 Red 1 ^: 02121 by light source driver 240, green LED 212G and blue LED 212B without emission intensity control of red LED 212R, green LED 212G and blue LED 212B Fig. 5 (b) is a waveform diagram showing the output voltage from the amplifier 252 in that case, and Fig. 5 (c) is a red LED 212R by the LED light source driver 240, Fig. 5 (d) is a waveform diagram showing the timing and intensity of light emission of the red LED 212R, green LED 212G and blue LED 212B when the emission intensity of each of the green LED 212G and the blue LED 212B is controlled. FIG. 6 is a waveform diagram showing the output voltage.

 In the soil inspection apparatus 200 according to the first embodiment, the LED light source driving unit 240 has a function of independently controlling the emission intensity of the red LED 212R, the green LED 212G, and the blue LED 212B by current control.

 Therefore, according to the soil inspection apparatus 200 according to the first embodiment, it is possible to cause the red LED 212R, the green LED 212G, and the blue LED 212B to emit light with optimal emission intensity for each color according to the color density. As a result, as shown in FIG. 5 (b), even when the transmittance of the green light is low and the output voltage from the amplifier 252 is low, as shown in FIG. 5 (c), the green LED 212G emits light. By increasing the intensity, as shown in Fig. 5 (d), the output voltage from the amplifier 252 can be increased, so that the color solution having a relatively high color density to the color solution having a relatively low color density can be used. It is possible to measure the light quantity accurately over a wide range (dynamic range).

FIG. 6 is a diagram shown for explaining the operation of the control unit 260 in the soil detection apparatus 200 according to the first embodiment. Fig. 6 (&) is a waveform diagram showing the timing and intensity of light emission of red 1 ^ 0212 green LED 212G and blue LED 212B, and Fig. 6 (b) does not control the amplification factor of each color analog signal independently. Fig. 6 (c) is a waveform diagram showing the output voltage from the amplifier 252 in the case of FIG. FIG. 6 (d) is a waveform diagram showing the output voltage from the amplifier 252 when the amplification rate of the analog signal of each color is controlled independently. is there.

 [0100] In the soil detection apparatus 200 according to Embodiment 1, the amplifier 252 includes the amplification factor of the analog signal from the red PD222R force, the amplification factor of the analog signal from the green PD222G, and the amplification of the analog signal from the blue PD222B. It has a function to control the rate independently.

 For this reason, according to the soil inspection apparatus 200 according to the first embodiment, it is possible to amplify an analog signal with an optimum amplification factor for each color according to the color density. As a result, for example, as shown in FIG. 6 (b), even if the green light transmittance is low and the output voltage from the amplifier 252 is low, the green color in the amplifier 252 as shown in FIG. By increasing the light amplification factor, the output voltage from the amplifier 252 can be increased as shown in FIG. 6 (d), so that a color solution with a relatively low color density can be developed from a color solution with a relatively high color density. It is possible to measure the light quantity accurately over a wide range (dynamic range) up to the liquid.

 [0102] FIG. 7 is a view for explaining how to use the slit 290 in the soil inspection apparatus 200 according to the first embodiment.

 In the soil inspection apparatus 200 according to the first embodiment, as shown in FIG. 7, a slit 29 0 for holding a colorimetric table (color plate) 292 between the LED light source 210 and the light receiving sensor 220. Have

 [0104] Therefore, according to the soil inspection apparatus 200 according to the first embodiment, whether or not the color density reading accuracy is deteriorated by appropriately measuring the amount of light while the colorimetric table 292 is held in the slit 290. By confirming the above, it is possible to suppress a decrease in the reliability of the soil test.

 [0105] Further, according to the soil inspection apparatus 200 according to the first embodiment, even when the soil inspection apparatus 200 is used over a long period of time by appropriately measuring the amount of light while holding the colorimetric table 292, It is possible to suppress the deterioration of the reliability of the soil inspection by suppressing the deterioration of the color density reading accuracy.

In this case, the calibration is performed by rewriting a relational expression indicating the relationship between the color density and the content of the component to be inspected or a relation table indicating the relationship between the color density and the content of the component to be inspected. Do more.

 In the soil inspection system 100 according to the first embodiment, the soil inspection program is installed in the external computer 300 in advance. This soil inspection program (soil inspection program according to Embodiment 1) is a soil inspection program for operating the external computer 300.

 FIG. 8 is a flowchart shown for explaining the soil inspection program according to the first embodiment. FIG. 9 is a diagram illustrating an example of a display screen displayed on the display unit 320.

 As shown in FIG. 8, the soil inspection program according to Embodiment 1 includes an external computer 300

 The first step S10 for sending a light intensity measurement request to the soil inspection apparatus 200 to perform a predetermined light intensity measurement operation to the soil inspection apparatus 200 and the external computer 300 output the soil inspection apparatus 200. The second step S20 for receiving the digital signal to be transmitted and the third step S30 for the external computer 300 to calculate the content of the component to be detected from the digital signal using the absorptiometry and the external computer 300 for the inspection target This is a soil inspection program in which a procedure for executing the fourth step S40 for displaying information including the content of components on the display unit 320 is recorded.

 More specifically, when soil inspection is performed using the soil inspection system 100 according to Embodiment 1, first, the soil inspection start button B shown in FIG. 9 is clicked. This

 0

 The external computer 300 transmits a light intensity measurement request for causing the soil inspection apparatus 200 to perform a predetermined light intensity measurement operation to the soil inspection apparatus 200 (first step S10). After that, by clicking the test target component selection button B or the integration count setting button B, the soil

 1 2

 Make the necessary settings to perform the inspection. After that, if you click start button B,

 Three

 By sequentially placing the round test tube T containing the irrigation solution and the round test tube T containing the test solution on the sample cell mounting part 230, the light quantity measurement for the control solution and the test solution It is possible to measure light quantity sequentially.

[0111] Next, the soil inspection apparatus 200 performs a predetermined light intensity measurement operation in response to the light intensity measurement request, and outputs a digital signal as a light intensity measurement result to the external computer 300. The external computer 300 The digital signal output from the detection device 200 is received (second step S20). [0112] Next, the external computer 300 receives the digital signal, and calculates the content of the component to be inspected from the digital signal using the absorptiometry (third step S30).

 [0113] Finally, the external computer 300 displays information including the content of the test target component calculated in the third step on the display unit 320 (the waveform display unit B, the content display unit B, and each content table in FIG. 9).

 4 5

 See indicator B. ) (4th step S40).

 6

 [0114] In the soil inspection system 100 according to the first embodiment, the content of the inspection target component is thus displayed on the display unit 320, and the soil inspection is completed.

 [0115] In the soil inspection program according to Embodiment 1, the light quantity measurement request transmitted to the soil inspection apparatus 200 in the first step S10 is the red LED 212R when the control solution is put in the round test tube T. Red during the period when no light is emitted PD222R first output P, red

 R1

 Second output P of green PD222R during the period when LED212R is emitting light, green LED2

 R2

 1st output P of green PD222G during the period when 12G is not emitting light, green LED212G

 G1

 Green PD222G second output P and blue LED212B emit light during the period when

 G2

 The blue PD222B first output P and blue LED212B emit light during the period when

 B1

 The test solution is applied to the second output P of the blue PD222B and the round test tube T.

 B2

 The third output P of the red PD222R when the red LED 212R is not emitting light, and the fourth output P of the red PD222R when the red LED 212R is emitting light

R3 R

, Green LED212G green during the period when the third output P of PD222G P, green

4 G3 color LED212G green LED222G 4th output P, blue LE

 G4

 3rd output P and blue LED of blue PD222B during period when D212B is not emitting light

 B3

 Measure the 4th output P of the blue PD222B during the period when 212B is emitting light.

 B4

 This is a request to send a fixed result to the external computer 300.

[0116] For this reason, according to the soil inspection program according to Embodiment 1, it is possible to measure the received light intensity in the LED non-lighting period and the LED lighting period for each color. By taking the difference, it becomes possible to reduce the influence of the background light leaking into the soil detection apparatus 200, and it becomes possible to perform light quantity measurement with higher accuracy. This also makes the light shielding structure of the soil inspection apparatus 200 simpler, and makes it easier to read the color density of the soil inspection apparatus 200. This makes it possible to construct an inexpensive and easy-to-use soil inspection device.

 [0117] Further, according to the soil inspection program according to the first embodiment, by measuring the received light intensity of both the control solution and the test solution, the variation in the round test tube T as the sample cell and the coloring solution can be reduced. Since the measurement error due to the presence of the turbid component contained can be reduced, more accurate light quantity measurement can be performed.

 [0118] As a control solution, in addition to pure water and tap water, an extract filtrate before adding a coloring reagent can be preferably used. The same round test tube can be used as the round test tube T containing the control solution and the round test tube T containing the test solution, or different round test tubes can be used for each. .

 When the control solution is put into the round test tube T, the light amount measurement is usually performed only once, but when the light amount measurement is performed for a long time, it is also preferable to perform the light amount measurement several times at an appropriate timing. .

 [0119] In the soil inspection program according to Embodiment 1, in the third step S30, as shown in the following formula (1), the second output P force of the red PD222R is also the first output of the red PD222.

 R2

 Control data for red light obtained by reducing P and the fourth for red PD222.

R1

 Output P power Red About red light obtained by reducing the third output P of PD222

R4 R3

 The red light transmittance T is determined from the inspection data and the second output P of the green PD222G

 R G2 Green Control data for green light obtained by reducing the first output P of PD222G

 G1

 And green PD222G 4th output P force Green PD222G 3rd output P

 G4 G3

 The green light transmittance T is determined from the obtained green light inspection data, and the blue P

 G

 D222B second output P force Blue Obtained by subtracting PD222B first output P

 B2 B1

 Control data for blue light, 4th output power of blue PD222B, blue PD222B

 B4

 From the inspection data for blue light obtained by reducing the third output P, the blue light

 B3

 Determine the transmittance T. And the red light transmittance T, the green light transmittance T and the blue light

 B R G

 Using at least one of the transmittances T, calculate the content of the component to be examined.

 B

[0120] [Equation 1] PR4-PR3 Ding. -PG4-PG3 T _B -PB4-PB3

 PR2-PR1 '― PG2-PG1' ― PB2-PB1

[0121] For this reason, according to the soil inspection system program according to Embodiment 1, the transmittance of the coloring solution is determined for each color, and the content of the component to be inspected is calculated using these transmittances. Thus, the content of the component to be inspected can be measured stably.

 [0122] Further, since the color developing solution is considered to absorb light sufficiently in at least one of the three wavelength ranges of red, green, and blue, the three color lights (red light, green light, and It is possible to calculate the content of any component to be inspected by calculating the content of the component to be inspected using at least one transmittance of blue light).

 Of course, in this case, if possible, it is more preferable to calculate the content of the component to be inspected using the transmittance of two or three color lights. By configuring in this way, it becomes possible to perform more reliable soil inspection.

 In the soil inspection program according to Embodiment 1, in the third step S30, as shown in the following formula (2), the red light transmittance T, the green light transmittance T, and the blue light transmittance Rate T

 R G B

 And the red light transmittance T relative to the total value T.

 SUM R

 Let the rate T 'be the green light transmittance T relative to the total value T. Relative green light transmittance T'

R SUM G G

 And the blue light transmittance T relative to the total value T is the relative blue light transmittance T ′.

 SUM B B

 Relative red light transmittance τ ', Relative green light transmittance τ' and Relative blue light transmittance τ '

 R G B

 Calculate the content of the component to be examined using at least one of these.

[0125] [Equation 2]

IB Ding '2 LG _TB , = TB _

 TR + TG + TB 'I'R + TG + TB TR + TG + TB

[0126] For this reason, according to the soil inspection program according to the first embodiment, the content of the inspection target component is calculated using the relative transmittance, so that a more reliable soil inspection is performed. It becomes possible.

[0127] In this case, the relative red light transmittance T ', the relative green light transmittance T' and the relative blue light transmittance It is more preferable to calculate the content of the component under test using at least two of the rates T '.

Β

 Of relative red light transmittance Τ ', relative green light transmittance Τ' and relative blue light transmittance Τ '

 R G Β

 More preferably, the content of the component to be inspected is calculated using three. In this case, for example, relative red light transmittance Τ ', relative green light transmittance Τ' and relative blue light transmittance Τ '

 R G Β

 It is possible to calculate the content of the component to be inspected by simple calculation average or weighted arithmetic average. By configuring in this way, it becomes possible to perform more reliable soil inspection.

 Note that in the soil detection system 100 according to the first embodiment, the external computer 300 supplies energy to the soil detection device 200 via the connection cord 330 (for example, a USB cord).

 [Example 1]

 Example 1 is an example in the case where the content of Μη (exchangeable manganese) in soil is measured using the soil inspection system 100 according to Embodiment 1.

 FIG. 10 is a graph showing the relationship between the color density and the content of Μη in Example 1. Fig. 10 (a) shows the relationship between the light transmittance as the color density and the content of Μη, and Fig. 10 (b) shows the relationship between the relative color light transmittance as the color density and the content of Mn. Fig. 10 (c) is a diagram showing the relationship between the Mn content and the relative red light transmittance, and Fig. 10 (d) is the relationship between the Mn content and the relative green light transmittance. FIG. 10 (e) is a diagram showing the relationship between the Mn content and the relative blue light transmittance.

 [0131] According to Example 1, as shown in Fig. 10 (a), as the Mn content increases, the transmittance T, in all colored light (red light, green light, and blue light) T and T decrease

 R G B

 Yes. The rate of decrease is the largest for blue light, the second largest for red light, and the smallest for red light.

 [0132] This was divided by the total transmittance (T + T + T) for each color transmittance T, Τ, T

 R G B R G B

 The relative color light transmittances T ′, Τ ′, Τ ′, which are values, include Mn as shown in Fig. 10 (b).

 R G B

 As the amount increases, the relative green light transmittance T ′ decreases, but conversely the relative red light

 G

 The light transmittance T ′ and the relative blue light transmittance T ′ are increasing.

 R B

FIG. 10 (c) to FIG. 10 (e) are the graphic powers expressed by changing the vertical axis and the horizontal axis in FIG. 10 (b). These figures show that the Mn content can be derived from the relative color light transmittance. For example, as a result of light intensity measurement for a certain color developing solution, the relative red light transmittance T ′ is 40%.

 R

 As shown in Fig. 10 (c), the Mn content is about 56ppm, and if the relative green light transmittance T is 25%, the Mn content is as shown in Fig. 10 (d). The amount is about 53ppm,

G

 If the relative blue light transmittance T 'is 35.3%, as shown in Fig. 10 (e), the Mn content

 B

 Is about 58ppm. In the case of Example 1, these three values are averaged so that the Mn content in the soil is about 56 ppm.

[Example 2]

 Example 2 uses the soil inspection system 100 according to Embodiment 1 to detect NO _N (

 3 This is an example when the content of nitrate nitrogen) was measured.

FIG. 11 is a graph showing the relationship between the color density and the content of N0_N in Example 2.

 Three

 . Figure 11 (a) is a diagram showing the relationship between the light transmittance as the color density and the content of N_N.

 Three

 Figure 11 (b) shows the relationship between the relative color light transmittance as the color density and the NO-N content.

 Three

 Figure 11 (c) shows the relationship between the NO-N content and the relative red light transmittance.

 Three

 Fig. 11 (d) shows the relationship between the NO-N content and the relative green light transmittance.

 Three

 Fig. 11 (e) shows the relationship between NO-N content and relative blue light transmittance.

 Three

 [0136] According to Example 2, as shown in Fig. 11 (a), as the content of NO N increases,

 Three

 In all color lights (red light, green light and blue light), transmittance τ is small

 R, τG, T decrease

 B

 is doing. The rate of decrease is the smallest for blue light, which is the largest for green light, and for red light, which is the next largest.

 [0137] This was divided by the total transmittance (T + T + T) for each color transmittance,, Τ, T

 R G B R G B

 The relative color light transmittances T ', Τ', Τ ', which are the values, are shown in Fig. 11 (b).

 As the content of R G B 3 increases, the relative green light transmittance τ ′ decreases and the relative red light transmission

 G

 The rate τ ′ increases and the relative blue light transmittance τ ′ hardly changes.

 R B

 [0138] Figs. 11 (c) to 11 (e) are diagrams in which the vertical axis and the horizontal axis in Fig. 11 (b) are changed.

 From these figures, from the relative red light transmittance T ′ and the relative green light transmittance T ′, NO

 R G 3

It can be seen that the content of _N can be derived. For example, if the relative red light transmittance T ′ is 56% as a result of light intensity measurement for a certain color developing solution, NO -N If the relative green light transmittance T ′ is 7%, the content of

 G

 As can be seen, the NO — N content is about 42 ppm. In the case of Example 2, these two values

 Three

 The average content of NO-N in the soil is about 41 ppm.

 Three

 [Embodiment 2]

 FIG. 12 is a perspective view for explaining the soil inspection system 102 according to the second embodiment. FIG. 13 is a block diagram for explaining the soil inspection system 102 according to the second embodiment.

 [0140] The soil detection system 102 according to the second embodiment has basically the same configuration as that of the soil detection system 100 according to the first embodiment. According to the first embodiment, the calculation unit 262 and the display unit 264 are arranged in the body 280 of the soil testing device 202 having the same configuration as the soil testing device 200 according to the first mode. This is different from the soil inspection system 200.

 [0141] As described above, the soil inspection system 102 according to the second embodiment is the same as the soil inspection system according to the first embodiment in that the calculation unit and the display unit are integrally disposed in the housing of the soil inspection device. Force different from the case of 100 Since it has the same configuration as that of the soil inspection system 100 according to Embodiment 1 in other points, the corresponding effect among the effects of the soil inspection system 100 according to Embodiment 1 remains as it is. Have.

 [0142] In the soil inspection system 102 according to the second embodiment, as shown in Fig. 12, a liquid crystal panel is used as the display unit 264 in order to reduce the size and weight. In addition, a battery (not shown) is used to operate the soil inspection system 102.

 [0143] Although the soil inspection system, the soil inspection apparatus, the soil inspection program, and the recording medium of the present invention have been described based on the above embodiments, the present invention is not limited to the above embodiments. Various modifications can be made without departing from the gist of the invention, within the scope, and for example, the following modifications are possible.

 [0144] (1) In each of the above embodiments, the content of Mn (exchangeable manganese) or NO_N (nitric nitrogen) is measured using the soil inspection system 100. In

 Three

 It ’s not limited. For example, pH (acidity), NH _N (ammonia nitrogen), P〇

 4 2 5

(Available phosphoric acid), KO (Kari), CaO (lime), MgO (matter), NaCl (salt), etc. The quantity can also be measured.

 (2) In Embodiment 1 above, the soil inspection system of the present invention is configured by installing the soil inspection program of the present invention in the external computer 300 in advance. It is not limited to. For example, the present invention includes the one in which the soil inspection device 200 and the recording medium on which the soil inspection program is recorded are included in the distribution process. In this case, the purchaser installs the soil inspection program recorded on the recording medium in his / her external computer into his / her computer, thereby configuring the soil inspection apparatus of the present invention.

 (3) In Embodiment 1 described above, the content of the test target component is calculated using the transmittance or the relative transmittance, but the present invention is not limited to this. ,. For example, the content of the test target component can be calculated using the absorbance.

 (4) In Embodiment 1 above, red PD222R, green PD222G, and blue PD222B force are parallel to the central axis of the round test tube T placed on the sample cell placement section 230 (y-axis Force using the light receiving sensor 220 arranged along the direction) The present invention is not limited to this. For example, a light receiving sensor in which red PD, green PD, and blue PD are arranged in a ring shape can be used.

 (5) In Embodiment 1 above, force using a round test tube T as a sample cell The present invention is not limited to this. As the sample cell, for example, a square cell can be used.

 [0149] (6) In the soil inspection system or soil inspection apparatus of the present invention, as an amplifier that amplifies the analog output signal from the light receiving sensor, a single amplifier that amplifies the analog output signal from each color PD as it is. You can also use three amplifiers that amplify the analog output signal from each color PD.

 [0150] (7) The procedure of light intensity measurement in the soil inspection system or soil inspection apparatus of the present invention is limited to the light intensity adjustment procedure described in the soil inspection system and soil inspection apparatus according to Embodiment 1. It ’s not something. Various procedures are possible.

 Explanation of symbols

[0151] 100, 102… Soil inspection system, 200, 202… Soil inspection device, 210 ′-LED light source, 21 2R ... Red: LED, 212G ... Green: LED, 212B ... Blue: LED, 214 ... Lens part, 215 ... Light diffusing material, 216 ... Black light guide member, 218 ... Light guide part, 220 ... Light receiving sensor, 222R ... Red PD, 222G ... Green PD, 222B ... Blue PD, 224 ... Light-shielding plate, 230 ... Sample Senole mounting part, 232 ... Circuit board, 240-LED light source driving part, 250 ... Signal processing part, 252 ... Amplifier, 254 •• -AD converter, 260… Control unit, 262… Calculation unit, 264… Display unit, 266… Power button, 268… Star button, 270… Interface unit, 280… Case, 282… Back cover, 290… Suritsu, 292 ... Colorimetric table (color plate), 300 ... External computer, 320 ... Display section, 33 0 ... Connection cord, 900 ... Soil detection kit, 910, 91 OA, 910B, 910C ... Extraction filter 920 ... Test tube for color development, 930 ... Colorimetric table, B ... Soil test start button, B ... Test target

 0 1

Minute selection button, B ... Integration count setting button, B ... Start button, B ... Waveform display section, B

 2 3 4 5

... Content display section, B ... Each content display section, B ... Stop button, T ... Round test tube

Claims

The scope of the claims

 [1] An LED light source having a red LED, a green LED and a blue LED that can emit light independently,

 A light receiving sensor having a red PD, a green PD, and a blue PD capable of measuring the received light intensity independently;

 A sample cell mounting portion disposed between the LED light source and the light receiving sensor for mounting a sample cell;

 An LED light source driving unit that drives the red LED, the green LED, and the blue LED, an amplifier that amplifies an analog output signal from the light receiving sensor, and an analog output signal amplified by the amplifier is converted into a digital signal and output. A signal processing unit including an AD conversion element;

 A control unit that controls the operation of the LED light source driving unit and the signal processing unit; a calculation unit that calculates the content of the component to be inspected from the digital signal using an absorptiometry;

 A soil inspection system comprising: a display unit configured to display information including the content of the inspection target component calculated by the calculation unit.

[2] An LED light source having a red LED, a green LED and a blue LED that can emit light independently,

 A light receiving sensor having a red PD, a green PD, and a blue PD capable of measuring the received light intensity independently;

 A sample cell mounting portion disposed between the LED light source and the light receiving sensor for mounting a sample cell;

An LED light source driving unit that drives the red LED, the green LED, and the blue LED, an amplifier that amplifies an analog output signal from the light receiving sensor, and an analog output signal amplified by the amplifier is converted into a digital signal and output. A signal processing unit including an AD conversion element; A soil inspection apparatus comprising: a control unit that controls operations of the LED light source driving unit and the signal processing unit; and an interface unit for outputting the digital signal to an external computer.

[3] In the soil inspection apparatus according to claim 2,

 The sample cell mounting part is configured to mount a round test tube as the sample cell.

[4] In the soil inspection apparatus according to claim 3,

 The soil light inspection apparatus, wherein the LED light source further includes a lens portion containing a light diffusing material.

 [5] In the soil inspection apparatus according to claim 3 or 4,

 From the LED light source to the round test tube, each color light from the red LED, the green LED, and the blue LED passes across the central axis of the round test tube placed on the sample cell placement unit. The soil test | inspection apparatus further provided with the black light guide part material which has a light guide part for light-guiding each said color light.

 [6] In the soil inspection apparatus according to any one of claims 3 to 5,

 The red PD, the green PD, and the blue PD have substantially the same planar shape, and are along a direction parallel to the central axis of the round test tube in a state of being placed on the sample cell placement portion. A soil inspection device characterized by being arranged.

 [7] In the soil inspection apparatus according to any one of claims 2 to 6,

 The control unit includes a first output of the red PD during a period when the red LED is not emitting light, a second output of the red PD during a period when the red LED is emitting light, and the green LED is not emitting light. The first output of the green PD in the period, the second output of the green PD in the period when the green LED is emitting light, the blue LED is not emitting, the first output of the blue PD and the blue color in the period Soil inspection characterized by controlling the operation of the LED light source driving unit and the signal processing unit so as to output the second output of the blue PD as a digital signal during a period in which the LED emits light. Equipment

[8] In the soil inspection apparatus according to any one of claims 2 to 7, The LED light source driving unit has a function of causing the red LED, the green LED, and the blue LED to emit light intermittently so as not to overlap each other in time. .

 In the soil inspection apparatus in any one of Claims 2-8,

 The soil light inspection apparatus, wherein the LED light source driving unit has a function of independently controlling light emission intensity of the red LED, the green LED, and the blue LED.

 In the soil inspection apparatus in any one of Claims 2-9,

 The amplifier has a function of independently controlling the amplification factor of the analog signal from the red PD, the amplification factor of the analog signal from the green PD, and the amplification factor of the analog signal from the blue PD. Soil inspection equipment.

 The soil inspection apparatus according to any one of claims 2 to 10:

 A soil inspection apparatus having a function of holding a colorimetric table (color plate) between the LED light source and the light receiving sensor.

 A soil inspection program for operating an external computer that constitutes the soil inspection system according to claim 1 together with the soil inspection device according to claim 2, wherein the external computer is connected to the soil inspection device. A first step of transmitting a light quantity measurement request for performing a predetermined light quantity measurement operation to the soil inspection apparatus;

 A second step in which the external computer receives the digital signal output by the soil testing device;

 A third step in which the external computer calculates the content of the component to be inspected from the digital signal using an absorptiometry;

 A soil inspection program in which a procedure for executing a fourth step in which the external computer displays information including the content of the component to be inspected on a display unit.

 In the soil inspection program according to claim 12,

The light quantity measurement request transmitted to the soil inspection apparatus in the first step is that the red LED emits light when the control solution is put in the sample cell, and the red PD of the red PD in the period is set. 1 output, 2nd output of the red PD during the period when the red LED is emitting light, the 2nd output of the green PD during the period when the green LED is not emitting light 1 output, the second output of the green PD during the period when the green LED is emitting light, the blue LED is emitting light, the first output of the blue PD during the period, and the blue LED is emitting light. A second output of the blue PD during a period of time, and

 When the test solution is put into the sample cell, the red LED emits light, the third output of the red PD in the period, the red PD in the period in which the red LED emits light. The fourth output of the green PD during the period when the green LED is not emitting light, the fourth output of the green PD during the period when the green LED is emitting light, the period when the blue LED is not emitting light Measuring the third output of the blue PD and the fourth output of the blue PD during the period when the blue LED is emitting light, and transmitting the measurement result to the external computer. Soil inspection program.

 In the soil inspection program according to claim 13,

 In the third step,

 Control data for red light obtained by subtracting the first output of the red PD from the second output of the red PD, and obtained by subtracting the third output of the red PD from the fourth output of the red PD. From the inspection data about red light, the transmittance T of red light

 R

Decide

 Control data for green light obtained by subtracting the first output of the green PD from the second output of the green PD and obtained by subtracting the third output of the green PD from the fourth output of the green PD. From the inspection data about green light, the transmittance T of green light

 G

Decide

 Control data for blue light obtained by subtracting the first output of the blue PD from the second output of the blue PD, and obtained by subtracting the third output of the blue PD from the fourth output of the blue PD. Blue light transmittance T from the blue light inspection data

 B

Decide

 The red light transmittance T, the green light transmittance T, and the blue light transmittance T.

 R G B

A soil inspection program, wherein the content of the component to be inspected is calculated using at least one of them. [15] In the soil inspection program according to claim 14,

 In the third step,

 The red light transmittance T, the green light transmittance T, and the blue light transmittance T are combined.

 R G B

 Relative red light transmission value of the red light transmittance T with respect to the total value T measured

 SUM R

 The ratio of the green light transmittance τ relative to the total value τ is the relative green light transmittance.

R SUM G

 And the blue light transmittance τ with respect to the total value τ is the relative blue light.

G SUM B

 When the transmittance τ ′ is used, the relative red light transmittance T ′, the relative green light transmittance T ′, and the relative blue light

 B R G

 The content of the test object component is calculated using at least two of the color light transmittances T ′.

 B

 A soil inspection program.

[16] A recording medium on which the soil inspection program according to any one of claims 12 to 15 is recorded.