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http://dx.doi.org/10.3807/KJOP.2021.32.3.108

Remote Sound Extraction Using Laser Doppler Interferometer  

Hwang, Jeong-hwan (Defense Industry Support Team, Korea Research Institute for Defense Technology Planning and Advancement)
Publication Information
Korean Journal of Optics and Photonics / v.32, no.3, 2021 , pp. 108-113 More about this Journal
Abstract
We propose and experimentally demonstrate a method of remote sound extraction using laser Doppler interferometry. The output frequency of a laser Doppler interferometer changes to be the same as the frequency of the acoustic wave from than object vibrated by the sound due to the Doppler effect. Based on this phenomenon, we measure the vibrational frequency of a remote target affected by a sound wave in real time, via laser Doppler interferometry. We track the peak frequency of the interferometer's output via appropriate signal processing, which confirms that the characteristics of the so detected wave are the same as that of the original sound source. We also confirm that the same method can retrieve the sound waves not only from remote sources of single tones, but from those of any sound.
Keywords
Laser Doppler interferometer; Optical sensor network; Sound restoration;
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