A laser sensing scheme for detection of underwater acoustic signals

Lee, M.S.; Bourgeois, Brian S.; Hsieh, S. Tonia; Martinez, Andrew B.; Hsu, Li Chi; Hickman, G. D.

doi:10.1109/secon.1988.194854

Cited by 10 publications

(4 citation statements)

References 3 publications

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“…Researchers have therefore been highly interested in laser-based WSAW detection techniques [3,4]. One of the earliest studies with this regard was reported in the paper of Lee M. S. [5], which illustrated the mechanism of WSAWs stemming from underwater acoustic signals. In his experiments, he also obtained optical signals with the same frequency as their acoustic source.…”

Section: Introductionmentioning

confidence: 99%

Demodulation Technique Based on Laser Interference for Weak Photo-Acoustic Signals on Water Surface

2018

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To detect underwater sound-generating targets, a water surface acoustic wave laser interference and signal demodulation technique is proposed in this paper. The underlying principle of this technique involves casting a laser beam onto the water surface disturbed by an underwater acoustic source and creating interference between lights reflected by the surface and reference lights. A data acquisition and processing system was employed to obtain water surface acoustic wave information from the interference signals by means of demodulation, thus allowing detection of the underwater target. For the purpose of this study, an interference detection platform was set up in an optical dark chamber. High-frequency water surface fluctuations were introduced in the reference optical path as the phase generated carriers to create laser interference signals in two different paths, which received demodulation based on an improved arc tangent demodulation algorithm and characteristic ratio algorithm, respectively, in view of their different frequencies. Water surface wave information was then derived from such low-frequency and high-frequency signals. According to test results, in the frequency range of 200 Hz–10 kHz, the frequency detection accuracy was better than 1 Hz. The amplitude measurements exhibited high repeatability, with a standard deviation lower than 2.5 nm. The theory proposed in this paper is therefore experimentally verified with good results.

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Section: Introductionmentioning

confidence: 99%

Demodulation Technique Based on Laser Interference for Weak Photo-Acoustic Signals on Water Surface

2018

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“…The research of laser detection of underwater acoustic signal was earliest reported in the article of M.S. Lee et al in 1988 [1]. They have put forward the laser intensity modulation theory, successfully detected in high frequency underwater acoustic signal.…”

Section: Introductionmentioning

confidence: 99%

Application of wavelet transform in laser detection of underwater acoustic signal

Zhang

Zou

et al. 2014

2014 11th International Computer Conference on Wavelet Actiev Media Technology and Information Processing(ICCWAMTIP)

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This article analyses the characteristic of time frequency distribution of laser detection signals of underwater acoustic signal, we discover the regularity of wavelet ridges distribution of laser interference signal: some wavelet ridges distribute on the scale-time curve which is corresponding with the frequency of underwater acoustic signal, or symmetrically distribute in the upper and lower sides. According to this regularity, a method for estimating the instantaneous frequency of underwater acoustic signal using wavelet ridges is put forward. Detection experiments of underwater acoustic signal with stable-frequency and the linear frequency modulation are both carried out using wavelet transform, and the results prove the correctness of this method.

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“…Previous studies to detect surface vibration were performed on the solid surface [1,2]. Lee and co-worker have developed a technique to detect underwater acoustic signals by utilizing the resultant surface perturbation [3]. The proposed hypothesis for the production of surface perturbation is based on the premise that the air-water interface is not a perfect pressure release surface.…”

Section: Introductionmentioning

confidence: 99%