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Name of Experiment：application of power amplifier in soil moisture content monitoring based on stress wave time inversion method

Research Direction：Application of power amplifier in soil moisture content monitoring based on stress wave time inversion method

Experiment Objective：Aiming at the problem of large-scale soil water content monitoring, the soil water content monitoring technology based on stress wave time inversion focused signal was studied.

Experiment Contents：in this paper, a monitoring method based on piezoelectric active sensing is proposed. The time inversion technology is used to improve the signal to noise ratio of the signal, and the relationship between the inversion focused signal and soil moisture content is established.

Experiment Equipment：piezoelectric sensor, arbitrary waveform generator, power amplifier, charge amplifier, data acquisition card, computer

Data acquisition system configuration diagram

Experiment Process：

The data acquisition system consists of arbitrary waveform generator, power amplifier (ATA-2041), charge amplifier, data acquisition card, computer and piezoelectric sensor at receiver and transmitter, as shown in the figure. Arbitrary waveform generator AFG-1022 generated waveform, after power amplifier ATA-2041 amplification, the output signal voltage is 400V. The received signal is amplified by the charge amplifier HK-9210 and collected by the multi-function data acquisition card NI-6366 to the computer.

Layout of soil test bodies and sensors

Data acquisition system

Experiment Result：

（1）The amplitude of the focused signal decreases with the increase of water content. The soil water content can be determined by analyzing the amplitude of the focused signal. This method can be used as an effective means for regional monitoring of soil water content.

（2）The focused signal obtained by the time inversion method can effectively improve the signal to noise ratio. Therefore, the piezoelectric active sensor time inversion method has a good application prospect in soil regional water content monitoring.

The focus signal was collected 10 times              Relationship between the amplitude

      at 24% moisture content                      of focusing signal and water content