Four-electrode original position soil salt content measuring method

Abstract

A four-electrode in-situ soil salinity measurement method based on a four-electrode soil salinity sensor, characterized in that an alternating constant current signal is used as the measurement excitation signal, and the four electrodes on the sensor form a pair of excitation electrodes respectively and a pair of collecting electrodes, the collecting electrodes are located between the exciting electrodes. The output signal of the invention responds to the dynamic change of in-situ soil salinity in real time, without time lag and measurement accumulation error; the output analog quantity has excellent linear response to the soil salinity content, and can adapt to in-situ soil salinity measurement in a wide range of fields.

Description

1. Technical field [0001] The invention belongs to the field of design and manufacture of electronic measuring and testing instruments, and relates to an in-situ soil salinity sensing and transmission integrated system, in particular to a method for measuring soil salinity used in in-situ measurement. 2. Background technology [0002] Soil salinity is an important indicator affecting basic soil properties, soil fertility and land productivity levels. In industries such as cultivated land quality assessment, saline-alkali soil treatment, irrigation area management, precision agricultural management, industrial pipeline layout, ecological environment monitoring, and scientific research, it is often necessary to perform in-situ determination or even in-situ continuous dynamic monitoring of soil salinity content. Therefore, in production practice, the determination of soil salinity content is required to develop in the direction of in-situ, reliable, convenient, accurate and con...

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Problems solved by technology

[0003] Porous ceramic chip soil salinity sensor measurement method has poor response ability to the field soil salinity change process, and cannot accurately measure rapid changes in soil salinity, and after a certain period of in-situ burying, the salt accumulated in the cavity of the closed conductivity cell, It is difficult to maintain balance with the soil, which will cause large measurement errors

And its output impedance change signal is susceptible to interference, poor accuracy and reliability

Other existing plug-in soil conductivity measurement methods are basically one-time survey methods, which cannot provide continuous dynamic measurement results for soil conductivity or soil salinity content

[0004] Another common problem with existing measurement methods is that none of the existing soil salinity sensors can provide a standard output signal. It is necessary to provide an additional excitation signal for conductivity measurement and use a dedicated complex measuring instrument for conductivity measurement, and then measure the soil salinity. Conversion

Therefore, the measurement process is cumbersome and the cost of measuring instruments is high, which cannot meet the needs of multi-point continuous measurement of in-situ soil salinity content and the construction of corresponding measurement networks in scientific research and production practice

Moreover, the original soil conductivity sensor still has matching differences with different batches of measuring instruments, resulting in deviations in measured values ​​after instrument replacement / updating, affecting data continuity and accuracy

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