Research on the technique of vibration frequency remote detection based on speckle pattern

SHI Huan; ZHU Hong; XIAO Rong; WU Ju; ZHANG Qiuxia; QIAN Rongxin

doi:10.7510/jgjs.issn.1001-3806.2016.06.006

In order to obtain the frequency information of remote object's micron vibration, the remote detection technique of micro vibration information bases on laser speckle interferometer was used. The CW laser of 532nm wavelength was used as light source to light the to-be-detected object surface 50m away. A high speed camera was used as speckle image acquisition system. At first, telephoto lens was used to do the appropriate defocus processing of remote speckle image. Then, the changing information of speckle was obtained from the vector size between the peak value of correlation and the origin point. At the same time, the vibration frequency information in a certain wide frequency range was extracted. The results show that, extraction accuracy of remote micro vibration frequency by laser speckle is up to 99.22%. The study can provide some argumentation basis for acoustic vibration based on laser speckle.

Research on the technique of vibration frequency remote detection based on speckle pattern

1. Special Technology Division, The Third Research Institute, Ministry of Public Security, Shanghai 201204, China

Received Date: 2015-10-22

Accepted Date: 2015-11-16

Available Online: 2016-11-25

Abstract: In order to obtain the frequency information of remote object's micron vibration, the remote detection technique of micro vibration information bases on laser speckle interferometer was used. The CW laser of 532nm wavelength was used as light source to light the to-be-detected object surface 50m away. A high speed camera was used as speckle image acquisition system. At first, telephoto lens was used to do the appropriate defocus processing of remote speckle image. Then, the changing information of speckle was obtained from the vector size between the peak value of correlation and the origin point. At the same time, the vibration frequency information in a certain wide frequency range was extracted. The results show that, extraction accuracy of remote micro vibration frequency by laser speckle is up to 99.22%. The study can provide some argumentation basis for acoustic vibration based on laser speckle.

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Reference (16)

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Research on the technique of vibration frequency remote detection based on speckle pattern

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