RECOMMENDATION BASED ON A GROUP OF ABSOLIDATED PARABOLOID ELECTROAKUSTIC WANDLES FOR TIEFAST SEA PROSPECTION.

摘要

PCT No. PCT/IT90/00075 Sec. 371 Date Feb. 27, 1992 Sec. 102(e) Date Feb. 27, 1992 PCT Filed Sep. 14, 1990 PCT Pub. No. WO91/04501 PCT Pub. Date Apr. 4, 1991.A method of and an apparatus for the high-resolution sea bottom prospecting, in which an electroacoustic paraboloidal transducer is placed into water, the electrodes of which are near the focus of the paraboloid and are connected both to a capacitor bank the capacitance of which may be varied at will and to a supply circuit for the generation of an electroacoustic discharge between said electrodes. As the capacitance varies the delay time between the primary pulse or underwater prospecting pulse and the cavitation pulse is recorded at any discharge, and at the same time dominant frequency of the prospecting signal spectrum is determined. Afterwards capacitance values are set so as to provide both cavitation pulses the contribution of which to the resulting pulse is minimum and a dominant frequency spectrum as broad as possible. The preset capacitance values are assigned to a capacitor array connected each to an electroacoustic paraboloidal transducer dipped in water, the electrodes of which are supplied so as to generate the underwater prospecting pulse.