A high hydrostatic pressure low frequency calibration chamber and testing method

Abstract

The invention discloses a high hydrostatic pressure low-frequency calibration chamber and a testing method, mainly comprising a metal chamber, a transmitting transducer, a reciprocal transducer, a manual pressure pump and a pressure gauge, and the metal chamber is a cylindrical airtight stainless steel The cavity is filled with sound-transmitting media. The metal cavity is equipped with a transmitting transducer, a reciprocal transducer and a hydrophone under test. The transmitting transducer and the reciprocating transducer are installed at symmetrical positions on both sides of the metal cavity. ;The manual pressure pump is connected with the metal cavity through the liquid inlet valve, which is used to apply high hydrostatic pressure to the metal cavity, and the liquid inlet valve is used to connect or isolate the metal cavity and the manual pressure pump; The drain valve is connected, and the pressure gauge is used to monitor the pressure in the metal cavity. The beneficial effect of the invention is that the low-frequency receiving sensitivity of the hydrophone can be tested by the comparison method between the tested hydrophone and 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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