Underwater sound projector response time reversal focusing measuring method

Abstract

Provided is an underwater sound projector response time reversal focusing measuring method, comprising the steps of: 1) collecting probing signals; 2) generating time reversal transmitting signals; 3) measuring current and voltage signals; 4) calculating sending response; and 5) correcting sending response. The method is based on an acoustic wave equation time reversal invariance principle, and realizes standard hydrophone receiving signal spatial and temporal focusing through an underwater sound reciprocity principle, thereby restraining reverberation in measuring projector response within a limited space, and solving difficulties in measuring projector response time under limited space strong reverberation.

Description

technical field [0001] The invention belongs to the field of electroacoustic parameter measurement of underwater acoustic transmitters, and in particular relates to a measurement method for transmitting response time inversion focusing of underwater acoustic transmitters in a non-free field environment. Background technique [0002] The underwater acoustic transmitter is a device that converts electrical energy into acoustic energy. It is the most basic and important part of various engineering applications and academic research such as underwater target detection, imaging, and communication. It plays a key role in underwater acoustic engineering. role. With the deepening of ocean development, higher and higher requirements are put forward for the performance of underwater acoustic transmitters, such as longer propagation distances and deeper working depths. In order to ensure the performance of underwater acoustic transmitters and the need for value transmission , its elec...

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Problems solved by technology

[0003] However, in the case of low frequencies, the sound absorption performance of the anechoic pool is reduced, which increases the reverberation recorded by the hydrophone during the measurement; and for deep water transmitters, it is usually difficult for the pressure tank with high-pressure test conditions to be anechoic, or the anechoic Incomplete, resulting in the same problem of reverberation and multipath interference in the measurement

Therefore, under low-frequency or high-voltage conditions, there are no free-field and far-field measurement conditions, and the existing electroacoustic parameter methods of underwater acoustic transmitters cannot be applied

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