Detection of diffraction light field of low-frequency underwater signal

WANG Yu-ming; MIAO Run-cai; MA Jing; MENG Feng

doi:10.7510/jgjs.issn.1001-3806.2013.05.027

In order to detect the low-frequency underwater acoustic signal at tens of hertz, an optical measurement method was put forward and a measurement system was developed. The clear and high stable diffraction pattern was observed experimentally when laser beam illuminates on the liquid surface modulated by underwater acoustic signal. The diffraction fringes were asymmetric. The expressions of the diffraction intensity were derived theoretically. The asymmetric distribution of position and diffraction intensity with laser oblique incidence was explained and the symmetric distribution of diffraction intensity with laser normal incidence was explained. Theoretical results were in good agreement with experimental ones. The results show that the position and diffraction intensity with laser oblique incidence has asymmetric distribution.

Detection of diffraction light field of low-frequency underwater signal

Corresponding author: MIAO Run-cai, rcmiao@snnu.edu.cn;

1. Institute of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, China;

2. Department of Electrical Engineering, Xi'an Aeronautical University, Xi'an 710077, China

Received Date: 2012-11-26

Accepted Date: 2012-12-28

Available Online: 2013-09-25

Abstract: In order to detect the low-frequency underwater acoustic signal at tens of hertz, an optical measurement method was put forward and a measurement system was developed. The clear and high stable diffraction pattern was observed experimentally when laser beam illuminates on the liquid surface modulated by underwater acoustic signal. The diffraction fringes were asymmetric. The expressions of the diffraction intensity were derived theoretically. The asymmetric distribution of position and diffraction intensity with laser oblique incidence was explained and the symmetric distribution of diffraction intensity with laser normal incidence was explained. Theoretical results were in good agreement with experimental ones. The results show that the position and diffraction intensity with laser oblique incidence has asymmetric distribution.

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Reference (19)

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Detection of diffraction light field of low-frequency underwater signal

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