Acoustic parameter near field measuring method of underwater sound sensor

Abstract

The invention discloses an acoustic parameter near field measuring method of an underwater sound sensor. The acoustic parameter near field measuring method of the underwater sound sensor includes: serving a spherical near field measuring array which is composed of multiple small-size sensors as a receiver, measuring emission acoustic parameters of a large-size be-measured acoustic sensor which is placed at the position of a sphere center in the direction where the large-size be-measured acoustic sensor is perpendicular to a spherical array equatorial face; calculating weighting coefficients; carrying out processing weighting data to receipt signals of the spherical near field measuring array through a plural weighting coefficient, and the obtained results are equal to data which are obtained by the be-measured sensor in a distant field plane wave sound field. The acoustic parameter near field measuring method of the underwater sound sensor has the advantages of having good flexibility, being economical, efficient and practical and is suitable for confirming parameters of acoustic sensors in a specific direction. According to the acoustic parameter near field measuring method of the underwater sound sensor, measuring requirements are avoided, and acoustic parameter measurement of a large-size underwater sound sensor can be achieved in a water pool with the limited size.

Description

technical field [0001] The invention relates to a near-field measurement method, more specifically, it relates to a near-field measurement method for acoustic parameters of an underwater acoustic sensor. Background technique [0002] Under normal circumstances, the measurement of the acoustic parameters of the acoustic sensor is carried out under the far-field plane wave sound field conditions of the underwater acoustic sensor under test. When the test frequency is higher or the sensor size is larger, the required far-field distance is bigger. Large-sized acoustic sensors pose many difficulties for conventional far-field measurement: ① the far-field free-field conditions required for measurement cannot be met in the limited water area under laboratory conditions; Interference affects and causes great difficulties in positioning and alignment, and in severe cases even leads to failure of the measurement. ③ It is difficult to use the far-field method to measure the spatial d...

AI Technical Summary

Problems solved by technology

Large-sized acoustic sensors pose many difficulties for conventional far-field measurement: ① the far-field free-field conditions required for measurement cannot be met in the limited water area under laboratory conditions; Interference affects and causes great difficulties in positioning and alignment, and even leads to measurement failure in severe cases

③ It is difficult to use the far-field method to measure the spatial directivity of large-scale acoustic sensors

④ The measurement of acoustic parameters required by some new acoustic sensors cannot be solved by conventional far-field methods

For large-aperture sensors, the limited size of the measurement facility will make direct measurement of its far-field radiation difficult or even impossible

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