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Proceedings Paper

Calibration of sound velocimeter in pure water
Author(s): Zhiwei Li; Baofeng Zhang; Tao Li; Junchao Zhu; Ziming Xie
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Paper Abstract

Accurate measurement of sound speed is important to calibrate a sound velocity profiler which provides real-time sound velocity to the sonar equipment in oceanographic survey. The sound velocity profiler calculates the sound speed by measuring the time-of-flight of a 1 MHz single acoustic pulse to travel over about 300 mm path. A standard sound velocimeter instrument was invited to calibrate the sound velocity profiler in pure water at temperatures of 278,283, 288, 293, 298, 303 and 308K in a thermostatic vessel at one atmosphere. The sound velocity profiler was deployed in the thermostatic vessel alongside the standard sound velocimeter instrument and two platinum resistance thermometers (PRT) which were calibrated to 0.002k by comparison with a standard PRT. Time of flight circuit board was used to measure the time-of-flight to 22 picosecond precision. The sound speed which was measured by the sound velocity profiler was compared to the standard sound speed calculated by UNESCO to give the laboratory calibration coefficients and was demonstrated agreement with CTD-derived sound speed using Del Grosso's seawater equation after removing a bias.

Paper Details

Date Published: 26 January 2016
PDF: 7 pages
Proc. SPIE 9903, Seventh International Symposium on Precision Mechanical Measurements, 99031R (26 January 2016); doi: 10.1117/12.2214098
Show Author Affiliations
Zhiwei Li, Tianjin Univ. (China)
Baofeng Zhang, Tianjin Univ. of Technology (China)
Tao Li, Tianjin Entry-Exit Inspection Quarantine Bureau Technical Ctr. for Safety of Industrial Products (China)
Junchao Zhu, Tianjin Univ. of Technology (China)
Ziming Xie, Tianjin Univ. (China)

Published in SPIE Proceedings Vol. 9903:
Seventh International Symposium on Precision Mechanical Measurements
Liandong Yu, Editor(s)

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