Method of using reverberation pool to carry out reciprocity calibration of underwater acoustic transducer

Abstract

The invention relates to a method of using a reverberation pool to carry out reciprocity calibration of an underwater acoustic transducer. The method of using a reverberation pool to carry out reciprocity calibration of an underwater acoustic transducer includes the steps: 1) according to the lowest frequency to be calibrated for an underwater acoustic transducer to be calibrated, selecting a reverberation pool with the corresponding size; 2) using any one nondirectional sound source and one hydrophone to form an emission / reception energy transducer pair, measuring the output voltage of an open circuit being 1m away from a sound source equivalent sound center in the reverberation pool and recording the emission / reception parameters of the apparatus; and 3) placing the emission / reception energy transducer pair in the reverberation pool, adjusting the same emission / reception parameters, and using a space averaging method to measure the output voltage of the open circuit of the hydrophone. If the method of using a reverberation pool to carry out reciprocity calibration of an underwater acoustic transducer is used to perform calibration of an underwater acoustic transducer, a plurality of hydrophones can be calibrated at the same time, so that the requirement for the experiment pool is reduced. Therefore, even in a reverberation pool with small size or a non anechoic pool, the method of using a reverberation pool to carry out reciprocity calibration of an underwater acoustic transducer can also be used for calibration only when the frequency range for calibration is satisfied.

Description

technical field [0001] The invention relates to a method for reciprocal calibration of an underwater acoustic transducer by using a reverberation pool. Background technique [0002] Hydroacoustic measurement is an important basis in the field of underwater acoustic technology. It is not only necessary for calibration, testing or identification of underwater electroacoustic transducers, but also the basis for indirect application of underwater acoustic transducers. With the increase of types of underwater acoustic equipment, the expansion of frequency range, the improvement of performance, etc., many new requirements are constantly put forward for underwater acoustic measurement. [0003] At present, the calibration of underwater acoustic transducers adopts the free-field calibration method (free-field calibration method of underwater acoustic transducers (GB3223-82)), which specifies the calibration method of underwater acoustic transducers under free-field spherical wave co...

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Problems solved by technology

This is due to the fact that in the actual calibration environment, the infinite free-field space condition cannot be satisfied, that is, the existence of no reflected sound is guaranteed. Even in an anechoic pool with good sound absorption conditions, there is still a lower limit frequency for measurement, so it cannot effectively meet the low frequency requirements. Transducer Calibration Requirements

[0004] The use of reverberation chambers to calibrate microphones in aeroacoustics has been maturely used. Due to the large difference in the characteristics of air and water, the calibration method in aeroacoustics cannot be effectively used in reverberation pools.

Wu Wenqiu used the diffusion sound field calibration method to calibrate the sensitivity of the two hydrophones with 1 / 3 bandwidth noise in the reverberation tank. The calibration results were quite different from the sensitivity measured by the noise comparison method at the factory.

Although this experiment uses broadband measurement to reduce the influence of normal waves in the sound field on the uniformity of the sound field, it sacrifices the frequency characteristics

At present, there is no report on the narrow-band frequency calibration of underwater acoustic transducers using spatial averaging in reverberation pools.

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