Estimation of dynamic effects in low-frequency hydrophone calibration

Three methods of estimation of dynamic effects in low-frequency hydrophone calibration by the hydrostatic exciter method are described. The advanced technique for the hydrophone calibration by hydrostatic exciter method is given. The main advantage of this technique is the possibility to excite the "variable hydrostatic" pressure up to 4-5 Hz with the precision frequency and displacement control. The results of comparison of three methods are brought along with the results of the researches on the base of which the most effective method (in the sense of accuracy and simplicity of measurements) is chosen. The possibility of calibration of hydrophones by this method at frequencies 0,001 to 2 Hz with uncertainty no more than 1 - 2 % is shown.