An apparatus for measuring and recording the velocity of sound and temperature versus depth in sea water
Two crystals are placed opposite each other at a fixed distance in water. The first crystal transmits a short ultrasonic pulse. This pulse is received by the second crystal. The generation of the (n + 1) th pulse is triggered by the (n)th received pulse. The resulting repetition frequency is automatically recorded. Multiple reflections in the water path are avoided by impedance matching at the backs of the crystals. The carrier frequency is 1 Mc/s, the relative accuracy is 0.03 °/00. Alternatively also the temperature can be recorded by means of a thermistor bridge. The records were made on an X — Y recorder in which the X coordinate is the depth, measured by a pressure gauge in a bridge, while the Y coordinate is alternatively the velocity of sound or the temperature. Values were recorded to depths up to 30 m. The response time is a few seconds.
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Document Type: Research Article
Publication date: January 1, 1958
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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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