High-hydrostatic-pressure low-frequency calibrating cavity and testing method thereof

Abstract

The invention discloses a high-hydrostatic-pressure low-frequency calibrating cavity and a testing method thereof. The high-hydrostatic-pressure low-frequency calibrating cavity mainly comprises a metal cavity, a transmitting transducer, a reciprocal transducer, a manual pressure pump and a pressure gauge, wherein the metal cavity is a cylindrical closed stainless steel cavity, sound bearing media fill the metal cavity, the transmitting transducer, the reciprocal transducer and a to-be-tested hydrophone are mounted in the metal cavity, and the transmitting transducer and the reciprocal transducer are symmetrically mounted on two sides in the metal cavity; the manual pressure pump is communicated with the metal cavity through a liquid inlet valve and is used for applying high hydrostatic pressure into the metal cavity, and the liquid inlet valve is used for communicating or separating the metal cavity with or from the manual pressure pump; a liquid draining hole in the metal cavity is communicated with a liquid draining valve, and the pressure gauge is used for monitoring the pressure in the metal cavity. The high-hydrostatic-pressure low-frequency calibrating cavity has the beneficial effects that the low-frequency receiving sensitivity of the to-be-tested hydrophone can be tested by comparing the hydrophone with the reciprocal transducer.

Description

technical field [0001] The invention relates to the field of underwater acoustic measurement, and relates to a high hydrostatic pressure low-frequency calibration cavity and a testing method. Background technique [0002] About 3 / 4 of the earth's area is ocean. Today, when land resources are increasingly scarce and some resources are exhausted, all countries in the world are turning their attention to the vast ocean, especially the deep sea. The exploration, development and utilization of marine resources will be the focus of development in the next few years. On June 24, 2012, the first 7,000-meter manned deep-sea submersible "Jiaolong" independently developed by my country and with independent intellectual property rights, dived to a depth of 7,020 meters in the dive test, breaking through the 7,000-meter water depth mark. Created a new history of China's manned deep dive. How to calibrate the performance of the acoustic sensors on deep submersibles such as the "Jiaolong"...

AI Technical Summary

Problems solved by technology

The compensation method is an absolute calibration method of sensitivity, the test process is relatively complicated, and it is also only suitable for low-frequency sensitivity calibration under normal pressure

The test device established by the above method has a complex structure, and the measurement procedure and device maintenance are relatively cumbersome.

[0004] In China, there are few studies on resistance to high hydrostatic pressure and low frequency. The high-pressure anechoic pool established by the first-level hydroacoustic metering station of the national defense science and technology industry can calibrate the receiving sensitivity of hydrophones. calibration problem

The coupling cavity calibration system established by Harbin Engineering University and the first-level hydroacoustic metering station of the National Defense Science and Technology Industry has a test frequency range of 20Hz to 2kHz and a maximum hydrostatic pressure of 10MPa, which is still far from meeting the needs of 50MPa or higher hydrostatic pressure. Due to the limitations of the body and the transmitting transducer, it is extremely difficult to improve the withstand voltage capability

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