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Tracking the Underwater Noise Source Using a Vector Sound-Intensity Probe

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Sound intensity is the vector quantity that informs us about the sound power flux, the location and the direction of the sound source. One of the methods to determine the sound intensity of acoustic signals in the water, the so-called gradient method, is when the measurement of pressure is carried out by means of two closely spaced hydrophones. This paper describes the vector probe in order to measure the sound intensity in the water environment as a passive receiver used in the determination of the direction of the sound source. The limitations were taken into account due to an arrangement of two closely spaced hydrophones. One component of the sound intensity is often determined in the base of the measurements from the probe, which consist of two hydrophones. All three components of the sound intensity need four or six pressure detectors [3, 1]. In our experiment two hydrophone probes were used, but the position of the receivers was cyclically changed by turning them on and off from 90 deg to 0 deg. This was done to determine the direction of a moving sound source in the water tank. The results were obtained using digital methods, by means of the FFT analyzer determining a component of the recorded acoustic pressures obtained by two channel equipment.
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Document Type: Research Article

Publication date: 01 September 2002

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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