2025_programme: Sound speed measurement in water and sound velocity meter calibration using time-difference method

• Day: June 17, Tuesday
    Location / Time: A. TERPSIHORI at 14:50-15:10
• Last minutes changes: Cancelled
• Session: 20. Underwater acoustic calibration, measurement, and standards
  Organiser(s): Will Slater
  Chairperson(s): Stephen Robinson, Will Slater
• Lecture: Sound speed measurement in water and sound velocity meter calibration using time-difference method
  Paper ID: 2165
  Author(s): Min Wang, Ping Yang, Ke Wang, Longbiao He, Guangzhen Xing, Wenxia Wang
  Presenter: Min Wang
  Abstract: Accurately measuring the sound speed in water is crucial for calibrating sound velocity meters and profilers, which are extensively utilized to supply real-time sound speed data for diverse sonar equipment. This paper presents a time difference method based on measuring the path length and the time-of-flight of an acoustic signal, and hence the sound speed. The associated measurement system is also introduced. A thermostatic water bath is used to control the sound speed by covering a temperature range from 276 K to 313 K with a stability of ±5 mK. The distance between the transducers is measured by a dual-axis laser interferometer, and the time-of-flight of the acoustic signal is determined by an accurate time chip named TDC-GP22. The entire system can measure the sound speed in the range of 1420 to 1520 m/s for pure water, with an uncertainty of 0.05 m/s. The calibration results of a sound velocity meter are also given.
• Corresponding author: Dr Min Wang
  Affiliation: National Institute of Metrology, China
  Country: China