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A Method of Calibrating Buoy Hydrophone Array Elements in a Reverberation Pool

A technology of hydrophones and buoys, which is applied in the direction of vibration measurement, instruments, and measuring devices in fluids. It can solve the problems that the underwater sound diffusion conditions are difficult to meet and the result error is large, and achieve the expansion of the lower limit of low-frequency calibration, easy operation, and good reproducibility

Active Publication Date: 2021-10-26
HARBIN ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reverberation field reciprocity method was first proposed by H.G.Diestel in aeroacoustics. Wu Wenqiu of Nanjing University introduced this method into the field of underwater acoustic measurement, but the result error is large due to the difficulty of satisfying the underwater acoustic diffusion conditions.

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  • A Method of Calibrating Buoy Hydrophone Array Elements in a Reverberation Pool
  • A Method of Calibrating Buoy Hydrophone Array Elements in a Reverberation Pool
  • A Method of Calibrating Buoy Hydrophone Array Elements in a Reverberation Pool

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specific Embodiment approach 1

[0028] (1) Selection of the scale of the reverberation pool. The width of the reverberation pool is at least 1.5 times the length of the buoy hydrophone array, and the ratio of the volume of the reverberation pool required for calibration to the volume of the buoy hydrophone array is not less than 8:1.

[0029] (2) Arrangement of buoy hydrophone array. According to the length of the buoy hydrophone array, it is arranged in a straight line in the reverberation pool. The buoy hydrophone is stably suspended in the reverberation pool. The distance from the edge of the buoy hydrophone array to the wall of the reverberation pool is greater than 1m.

[0030] (3) Arrangement of standard transmitting transducers and standard hydrophones. Place a standard transmit transducer and a standard hydrophone in the reverberation tank. The distance between the standard transmitter and the buoy hydrophone array is not less than 2 times the reverberation radius; the standard hydrophone is placed...

specific Embodiment approach 2

[0037] The purpose of the present invention is to provide a method for calibrating sensitivity of buoy hydrophone array elements in a reverberation pool, which can solve the problem of overall low-frequency calibration of the sensitivity of large buoy hydrophones. Take the anechoic pool and reverberation box of Harbin Engineering University Key Laboratory of Underwater Acoustic Technology as an example below to describe the present invention in detail:

[0038] The standard transmitting transducer adopts EDO 6829-17k omnidirectional sound source. The power amplifier adopts B&K 2713 power amplifier. The standard hydrophone adopts the RHS(A)-20 hydrophone. The data collector adopts B&K PULSE3560E dynamic signal analyzer with a sampling rate of 50kHz. The calibration array is HEUAV-20 buoy hydrophone array, the array is 8m long, 8cm in diameter, and has 30 array elements in total.

[0039] (1) Selection of the scale of the reverberation pool. According to the requirement that...

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Abstract

The invention provides a method for calibrating a buoy hydrophone array element in a reverberation pool. (1) Selection of the reverberation tank and arrangement of the buoy hydrophone array; (2) Arrangement of the auxiliary standard transmitting transducer and hydrophone in the reverberation tank; (3) Synchronization of the sound source scanning movement with the output voltage (4) Calculate the receiving voltage sensitivity of the buoy hydrophone array element by using the method of self-power spectrum time average. The method of the invention is mainly used in reverberation pools to accurately measure the amplitude of receiving voltage sensitivity of buoy hydrophone arrays, and realizes overall calibration after assembly of buoy hydrophone arrays.

Description

technical field [0001] The invention relates to a calibration method for hydrophone array calibration, in particular to a method for calibrating buoy hydrophone array elements in a reverberation pool based on sound source scanning movement. Background technique [0002] The buoy hydrophone array is an important measurement equipment in underwater acoustic engineering. It has important applications in the measurement of marine environment observation and structural radiation noise evaluation. Its performance is related to the reliability and accuracy of measurement applications. Therefore, the calibration of the buoy hydrophone array before leaving the factory is particularly important. [0003] For scalar hydrophones, their sensitivity is an important indicator of the product, and generally speaking, the most concerned is the amplitude sensitivity. At present, the common hydrophone calibration is the free-field calibration method. The International Electrotechnical Commissi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H3/00
CPCG01H3/005
Inventor 尚大晶黄勇军李琪唐锐孙俊东纪京召杨柳青
Owner HARBIN ENG UNIV