Calibration of sound velocimeter in pure water

Zhiwei Li; Baofeng Zhang; Tao Li; Junchao Zhu; Ziming Xie

doi:10.1117/12.2214098

26 January 2016 Calibration of sound velocimeter in pure water

Zhiwei Li, Baofeng Zhang, Tao Li, Junchao Zhu, Ziming Xie

Proceedings Volume 9903, Seventh International Symposium on Precision Mechanical Measurements; 99031R (2016) https://doi.org/10.1117/12.2214098
Event: Seventh International Symposium on Precision Mechanical Measurements, 2015, Xia'men, China

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.

Citation Download Citation

Zhiwei Li, Baofeng Zhang, Tao Li, Junchao Zhu, and Ziming Xie "Calibration of sound velocimeter in pure water", Proc. SPIE 9903, Seventh International Symposium on Precision Mechanical Measurements, 99031R (26 January 2016); https://doi.org/10.1117/12.2214098

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