Abstract：In view of the lack of sensitivity calibration means of low-frequency large-planar hydrophone in variable temperature and pressure environment, a semi-traveling-wave tube method is proposed. By controlling the transducers at the extremes of the tube, a traveling-wave champ is generated on one side of the hydrophone. On the other side, there is a standing-wave champ. The general expression of the sensitivity is deduced. Under normal temperature and pressure, the calibration results are in good agreement with the traditional low-frequency calibration method, which proves that this method can effectively calibrate the sensitivity of large-planar hydrophone. The calibration results of hydrophone sensitivity under different temperature and pressure environment show that this method is feasible to calibrate hydrophone under variable temperature and pressure, and provides a method for the calibration of hydrophone sensitivity in larg-planar. The uncertainty of measurement is evaluated, the expanded uncertainty is 3dB.
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2021, Vol. 42 
