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Measuring device of soil conductivity and method

A soil conductivity and measurement device technology, applied in the field of sensing technology and soil physical and chemical characteristics measurement, can solve the problems of large measurement errors, etc., and achieve the effects of easy frequency control, stable and reliable performance, and simple peripheral circuits

Inactive Publication Date: 2009-12-23
CHINA AGRI UNIV
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  • Claims
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Problems solved by technology

For the above two devices, the size of the input electrode excitation current signal is fixed after the instrument is manufactured, so that when the average value of the soil conductivity to be measured deviates from the average value of the instrument's measurement range, a large measurement error will be brought

Method used

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  • Measuring device of soil conductivity and method
  • Measuring device of soil conductivity and method
  • Measuring device of soil conductivity and method

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Embodiment Construction

[0044] The soil electrical conductivity measuring device and method according to the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0045] The soil conductivity measuring device of the present invention mainly includes a sensor unit and a data acquisition and processing unit, wherein the sensor unit mainly includes electrodes arranged at equal intervals in a straight line; the data acquisition and processing unit mainly includes a voltage conversion circuit, a signal conditioning circuit, an analog-to-digital conversion device, data controller and liquid crystal display circuit; also includes: AC source signal generation circuit, AC constant current source output circuit and AC constant current source current regulation circuit. The block diagram of the whole device is shown in figure 1 shown.

[0046]The voltage conversion circuit converts the DC power provided by the external power supply into AC p...

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Abstract

The invention discloses a measuring device of soil conductivity, mainly comprising a sensor unit and a data acquisition and processing unit; the sensor unit mainly comprises electrodes which are configured in a linear equal interval manner; the data acquisition and processing unit mainly comprises a voltage conversion circuit, a signal conditioning circuit, an analog-to-digital converter, a data controller and a liquid crystal display circuit, and also comprises a alternating-current source signal generating circuit, an alternating-current constant current source output circuit and an alternating-current constant current source regulating circuit. According to the measuring device of soil conductivity, the invention also discloses a measuring method of soil conductivity. The invention can regulate the size of exciting current input into the soil at any time according to soil characteristics of the measured farmland so as to guarantee that the sensor works at the linear area under any soil condition, has high measuring accuracy and also has the function of data display and storage.

Description

technical field [0001] The invention relates to sensing technology and soil physical and chemical characteristic measurement technology, in particular to a soil electrical conductivity measurement device and method. Background technique [0002] Soil science studies have shown that soil electrical conductivity is an important parameter of soil. It correlates well with soil texture, salinity, organic matter levels, cation exchange levels, drainage conditions and other properties that affect crop yield. Therefore, the acquisition of soil electrical conductivity information is of great significance for determining the differences in the spatial distribution of various field parameters. [0003] The measurement of soil conductivity can be roughly divided into two categories: laboratory measurement and field measurement. The laboratory measurement first needs to prepare the soil extract, and then use the electrode method to measure the conductivity of the soil extract, and use ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/04
Inventor 李民赞陈玲赵勇张俊宁
Owner CHINA AGRI UNIV
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