2025_proceedings: Analysis of signal processing methods applied in wide band free-field calibrations of hydrophones

• Session: 20. Underwater acoustic calibration, measurement, and standards
  Organised by: Stephen Robinson
• Lecture: Analysis of signal processing methods applied in wide band free-field calibrations of hydrophones
  Paper ID: 2189
  Author(s): Guanghui Jia, Yi Chen, Liuqing Yang
  Presenter: Guanghui Jia
  Abstract: In free-field underwater acoustic measurements, wide band free-field calibrations of hydrophones are limited by the reflecting acoustic waves from boundaries. The free-field calibration model containing the directing acoustic wave and reflecting acoustic waves are established, and signal processing methods can be used to eliminate the reflections from boundaries, which are widely applied in wide band hydrophone calibrations and expanding their frequency limitations. The characteristics of the directing acoustic wave and reflecting acoustic waves of free-field calibrations are discussed based on a linear response system. The applications of signal processing in time domain and frequency domain which enable wide band free-field calibration to be undertaken in a limited space and decrease the reflections from boundaries are described. The wide band experiments of hydrophones were respectively performed using noise signals and chirp signals in several laboratory underwater tanks, and the wide band sensitivities were obtained. The responses of different signal processing methods were analysed which can give instructions of wide band hydrophone calibrations in laboratory underwater tanks.
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• Corresponding author: Mr Guanghui Jia
  Affiliation: Hangzhou Applied Acoustics Research Institute
  Country: China