Opto-acoustic underwater remote sensing (OAURS) - an optical sonar?

Farrant, David I.; Burke, Jan; Dickinson, L P; Fairman, Philip S.; Wendoloski, J. C.

doi:10.1109/oceanssyd.2010.5603579

Cited by 11 publications

(22 citation statements)

References 8 publications

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“…One example of the use of photoacoustics in underwater remote-sensing is the OAURS (Opto Acoustic Underwater Remote Sensing) bathymetric technique [35]. The method permits measuring the depth of water bodies or the depth of immersion of objects, e.g.…”

Section: Remote Sensing Of Underwater Objectsmentioning

confidence: 99%

Photoacoustic in remote sensing

Borowski

2020

Radioelectronic Systems Conference 2019

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One of the first applications of the photoacoustic effect included the wireless voice communication over long distances. Nowadays, the photoacoustic methods have laid the foundation for the operation of measuring instruments, used e.g. for contactless specification of the composition and spatial distribution of substances. Photoacoustic methods are also used in the ultra-sensitive spectroscopic examination of trace gases, e.g. for the detection of toxic substances, explosives, biological materials. Remote sensing applications, such as contactless imaging of material structures as well as biological in vivo structures are a manifestation of the extraordinary versatility of photoacoustic methods. Photoacoustic imaging is of very high resolution and contrast. Selected aspects of photoacoustics in remote sensing, especially the possibility of remote sensing of underwater objects have been presented with the history of photoacoustics development in the background.

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Section: Remote Sensing Of Underwater Objectsmentioning

confidence: 99%

Photoacoustic in remote sensing

Borowski

2020

Radioelectronic Systems Conference 2019

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“…With the PGC demodulation technique, an arc tangent function demodulation method [15] was used to achieve electronic mixing, filtering, and phase division of the signals expressed by Equation (6). On this basis, the water surface fluctuations under measurement can be obtained by means of demodulation and expressed as follows:…”

Section: Pgc-based Improved Arc Tangent Demodulation Algorithmmentioning

confidence: 99%

“…A combination of the carrier modulation depth H obtained from the spectrum and the carrier initial phase θ c in Equation 6gives complete information on demodulated water surface fluctuations, which, after elimination of low-frequency disturbances through high-pass filtering, provides WSAW information. With the PGC demodulation technique, an arc tangent function demodulation method [15] was used to achieve electronic mixing, filtering, and phase division of the signals expressed by Equation (6). On this basis, the water surface fluctuations under measurement can be obtained by means of demodulation and expressed as follows:…”

Section: Pgc-based Improved Arc Tangent Demodulation Algorithmmentioning

confidence: 99%

“…In his experiments, he also obtained optical signals with the same frequency as their acoustic source. Since then, a number of techniques have been brought forward by other researchers, including those based on laser scattering, laser diffraction, luminous flux, and laser interference [6,7], all contributing to direct processing of light intensity signals. By using a laser sonar technique measuring Doppler vibrations, Antonelli L. T. et al [8,9] detected WSAWs, and later completed single-point detection at different locations of dynamic water surface.…”

Section: Introductionmentioning

confidence: 99%

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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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“…However, the turbid water and the marshland limite the conventional detecion schemes, especially the East China Sea. To overcome these difficulties, one possible method is LDV, which is able to provide a remote sensing capability and detect the underwater sound by measuring the water surface vibration on the in-air platforms [7].…”

Section: Introductionmentioning

confidence: 99%