Underwater sound projector response time reversal focusing measuring method

A technology of response time and focus measurement, which is applied in transmitter monitoring, radio wave measurement systems, instruments, etc., can solve problems such as reverberation enhancement, incomplete noise reduction, and lack of free-field and far-field measurement conditions, so as to reduce interference , the effect of suppressing reverberation

Active Publication Date: 2016-07-13
ZHEJIANG UNIV
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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 a

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  • Underwater sound projector response time reversal focusing measuring method
  • Underwater sound projector response time reversal focusing measuring method
  • Underwater sound projector response time reversal focusing measuring method

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Embodiment approach

[0017] refer to figure 1 , a transmission response time inversion focusing measurement method of an underwater acoustic transmitter, which is used for testing the transmission response of an underwater acoustic transmitter. The implementation of the whole set of measurement methods is as follows:

[0018] 1) Acquisition of detection signals

[0019] First, according to the frequency range to be measured, the signal to be emitted is generated by the measurement system, such as a broadband chirp signal or a narrowband pulsed cosine signal. Then, place the standard hydrophone at the acoustic axis distance d of the transmitter (in m, starting from the acoustic center of the transmitter, satisfying the far-field condition), as figure 1 As shown, the signal is controlled by the computer system and the probe signal is transmitted by the transmitter through the D / A conversion and power amplifier, and the hydrophone records the transmitted signal propagated through the test environme...

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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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Application Information

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IPC IPC(8): G01S7/52H04B17/14
CPCG01S7/52004H04B17/14
Inventor 李建龙徐文吴秋韵
Owner ZHEJIANG UNIV
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