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Received: Apr. 28, 2015
Accepted: Jul. 9, 2015
Posted: Jan. 23, 2019
Published Online: Sep. 14, 2018
The Author Email: Lieshan Zhang (zhanglieshan@163.com), Xiaolin Zhang (zhangxiaolin@hit.edu.cn)
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Lieshan Zhang, Xiaolin Zhang, Wenyan Tang. Amplitude measurement of weak sinusoidal water surface acoustic wave using laser interferometer[J]. Chinese Optics Letters, 2015, 13(9): 091202
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Instrumentation, Measurement, and Metrology
Chinese Optics Letters, Vol. 13, Issue 9, 091202 (2015)
Amplitude measurement of weak sinusoidal water surface acoustic wave using laser interferometer
Lieshan Zhang*, Xiaolin Zhang**, and Wenyan Tang
Author Affiliations
- School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China
Abstract
To determine the amplitude of weak sinusoidal water surface acoustic wave (WSAW), a method based on the spectrum analysis of the phase-modulated interference signal is developed. Calculated from the amplitude spectrum of the detection signal, a characteristic ratio indicates that the phase-modulation depth of a WSAW is suggested by determining the amplitude of a WSAW according to their functional relationship. Experimental investigations for a 4 kHz WSAW evaluate the measurement’s precision with an amplitude measurement standard deviation of 0.12 nm. The measurement accuracy also is demonstrated by the experimental investigations. The theory of this method is briefly described, and the experimental setup is presented.
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