A device and method for real-time measurement of deep-sea performance of low-frequency transducers

Abstract

The invention discloses a device and method for real-time measuring the deep-sea performance of a low-frequency transducer, which relates to the field of underwater acoustic transducers. The device is composed of an electronic cabin, a battery cabin, a monitoring hydrophone, etc., and each component is integrated in a buoyancy frame There are hanging points under the main body of the device for mounting the transducer to be tested; there are load-bearing points on the top and bottom of the device, and the main body and the transducer can be placed to a specified depth by using a ship-borne winch, or through an additional mooring device Deploy to the specified depth in the form of submersible buoys. The device is flexible in use, the electronic system drives the transmitting transducer to work, records real-time depth information through the depth sensor, and monitors the open circuit voltage value of the hydrophone at the same time to establish a depth-monitoring hydrophone signal-transmitting transducer sound The source-level mapping relationship can realize accurate testing of the performance of low-frequency, large-size transducers under deep-sea high hydrostatic pressure conditions, and solves the problem that the actual deep-water performance of low-frequency transducers cannot be accurately obtained in the past.

Description

technical field [0001] The invention relates to the field of underwater acoustic transducers, in particular to a device and method for real-time measuring deep-sea performance of low-frequency transducers. Background technique [0002] The propagation loss of acoustic signals in water is closely related to the operating frequency. The higher the frequency, the greater the absorption attenuation coefficient and the shorter the transmission distance. Conversely, the farther the transmission distance is, the lower the operating frequency is required, the narrower the operating bandwidth, and the lower the communication rate. The attenuation of sound waves in water (including seawater) is proportional to the square of the frequency. The sound wave frequency increases from 0.5kHz to 1kHz, and the absorption attenuation at a distance of 100km increases from 2.5dB to 7.4dB, and the absorption attenuation at 7kHz frequency reaches 63dB . It can be seen that the use of sound waves ...

AI Technical Summary

Problems solved by technology

For example, the patent "CN105652263B A Non-Free Field Time Defocusing Measurement Method for Underwater Acoustic Transmitter" is based on the time-reciprocity reciprocity principle of sound propagation to reduce the influence of reverberation caused by the measurement environment boundary on the measurement signal. Its test The results need to be corrected to be compared with the traditional transducer measurement method, and the correction needs to replace the transmitting transducer under test with a standard transmitting transducer, but the performance of the standard transmitting transducer in deep water environment is also difficult to measure accurately , resulting in the limitation of its method

In general, this type of method itself has certain limitations. Some algorithms have clear requirements for the test sound field, and some have special requirements for auxiliary facilities such as clamping and positioning devices. There are differences between the test results of similar methods and the actual performance of the transducer. Certain differences, and cannot accurately simulate the deep sea low temperature environment

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