Study on liquid surface wave detection based on laser Doppler effect
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Corresponding author:
TANG Wen-yan, tangwy@hit.edu.cn
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Received Date:
2009-02-09
Accepted Date:
2009-04-24
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Abstract
To measure the frequency and amplitude of low-frequency liquid surface wave, a detection method based on the principle of Doppler interferometry for velocity measurement is proposed, which makes use of interference between laser scattered on liquid surface and reference beams. Theoretical analysis was carried out to achieve the analytical expression for Doppler shift and amplitude of liquid surface wave.Also, the feasibility of demodulating frequency of low-frequency liquid surface wave from the spectrum was evaluated with Bessel functions.A test system was designed and implemented for Doppler interferometry for liquid surface wave. The test results show that parameters of liquid surface wave at 10Hz～40Hz can be measured accurately. This method provides a new solution for detection of liquid surface wave.
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