Sound pressure calibration method for long linear array cable hydrophone

Abstract

The invention relates to the technical field of array cable hydrophone performance measurement, and in particular relates to a sound pressure calibration method for a long linear array cable hydrophone. The method comprises the steps of S1 coiling a long linear array cable on a hollow measurement frame according to a certain interval distance, and meanwhile, keeping a hydrophone array element fixed at each relative position of the array cable; S2 vertically suspending and fixing a low-frequency sound source on the hollow measurement frame by using a nylon rope, tensioning the circumference ofthe sound source in four directions by using the nylon rope, so that the sound source does not swing forwards, backwards, leftwards and rightwards, and the circumferential radiation center of the sound source and the measured hydrophone array element are positioned at the same horizontal position; S3 installing a standard hydrophone at the position, a certain distance away from the sound source, of the hollowed measurement frame, and the standard hydrophone and the sound source being located at the same horizontal position without swing; and S4 hoisting the whole mounted hollow measurement frame into water by using a steel cable. During working, no matter what the posture of the underwater measurement frame changes, the influence of water flow and the deviation of depth do not influence the measuring process.

Description

technical field [0001] The invention relates to the technical field of performance measurement of array cable hydrophones, in particular to a sound pressure calibration method for long line array cable hydrophones. Background technique [0002] At present, long line arrays (piezoelectric hydrophone array cables and optical fiber hydrophone array cables) buried in the seabed are widely used in China, and the test tasks are also very frequent. These two long-line array cables are installed with key parts - acoustic hydrophones, so each array cable needs to be tested for acoustic performance. Each array cable is long and has a receiving array element water every x meters Listener array elements, an array cable generally has a total of 16 yuan, so that the length of the cable can reach more than tens of meters. Currently, fairleads are widely used in the industry to guide the array cables into the water vertically, and the receiver sensitivity measurement is performed when the ...

AI Technical Summary

Problems solved by technology

Currently, fairleads are widely used in the industry to guide the array cables into the water vertically, and the receiver sensitivity measurement is performed when the hydrophone array elements enter the water in turn to a certain depth. This method of measuring the sound pressure sensitivity of the hydrophone is simple but very time-consuming and laborious The change of the posture of the lower array cable, the influence of the water flow, and the deviation of the depth all have a great impact on the measurement data. Therefore, it is urgent to develop a sound pressure calibration method for the long-line array cable hydrophone to solve the above problems.

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