Original position soil salt content sensing transducer

Abstract

An in-situ soil salinity content sensor transmitter, it is characterized that the sensor transmitter comprises two parts, a four-electrode soil salinity measurement sensor and a signal generating, signal processing device, and it uses alternating constant current signal as the measurement excitation signal, and the four electrodes of the sensor respectively constitute one pair of excitation electrodes and one pair of acquisition electrodes, and acquisition electrodes is between excitation electrodes. The output signal of the invention can real-time respond the in situ soil salinity dynamic changes, no lag time, no measuring cumulative error; the output analog value has good linear response on soil salinity content, and it can apply to in-situ soil salinity measurement of the wide field.

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 integrated system for sensing and transmitting soil salinity content in situ. 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 continuous dynamic determination. [0003] Porous ceramic chip soil salin...

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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...

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