The results of an interlaboratories round-robin comparison of hydrophone calibration techniques in the frequency range 0,1 Hz - 200 kHz carried out in Russia in 1993-97 are described. Six hydrophones of two types were circulated to twelve laboratories involved in defence, education, shipbuilding, and state metrology activity. Bofh types of hydrophones were designed in All-Russian Scientific Research Institute for Physical-Technical and Radiofechnical measurements (VNIIFTRI). Each laboratory determined the open-circuit end-of-cable hydrophone sensitivity using their normal calibration methods. The agreement between all the participants was within 1 dB at frequencies 0,1 Hz -100 kHz and within 2 dB at frequencies 100 - 200 kHz.
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.
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