Application of power amplifier in soil moisture content monitoring by time inversion method
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
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