Underwater very low frequency (VLF) broadband sound source

Abstract

The invention discloses an underwater very low frequency (VLF) broadband sound source, which is composed of a shell, a vibration component, a guide component, a support and seal component, a magnetic circuit component, a seal and an electric interface. The underwater VLF broadband sound source is applied to the fields of underwater sound detection, marine geological prospecting, underwater target simulation and the like as a detection target or a test sound source. For the purpose of improving response flatness, broadening bandwidth, strengthening functional reliability, and increasing sound source level, in the underwater VLF broadband sound source, the vibration component is subjected to modality and quality control, thereby realizing light weight, large flexible rigidity and small parasitic oscillation; the working frequency lower limit of a system is reduced by flexible support, thus the working band is wider and flatter; the reliability of a coil and the fidelity of signals are improved by the guide device with limit and low friction; the magnetic driving force is improved by the twin-coil combination and the optimization of a strong-magnet closed magnetic circuit; and the underwater VLF broadband sound source is internally provided with a rubber air bag, thus being simple in structure, realizing self-adaption hydrostatic pressure compensation, and being convenient to use.

Description

technical field [0001] The invention relates to an underwater acoustic transducer, mainly an underwater very low frequency broadband sound source. Background technique [0002] In many fields such as underwater acoustic detection, marine geological exploration, underwater target simulation, etc., it is necessary to provide very low frequency and broadband underwater sound source as a detection target or as a test sound source to test the performance of hydroacoustic hydrophones and receiving arrays. Measurement and Performance Calibration. It generally puts forward the following requirements for the sound source: [0003] 1 Working frequency bandwidth, the lower limit of frequency is as low as 200Hz, and the upper limit of frequency is as high as 2000Hz; [0004] 2 Horizontal radiation is omnidirectional and non-directional if the fluctuation does not exceed 3dB; [0005] 3 If the sound source level of the radiated signal exceeds 160dB, it can meet the signal-to-noise rat...

AI Technical Summary

Problems solved by technology

[0004] 2 Horizontal radiation is omnidirectional and non-directional if the fluctuation does not exceed 3dB;

The method is simple, but the adjustment accuracy is not high and it is inconvenient to use;

[0018] 2. The external gas pressure active control device, according to the signal of the pressure sensor, the system automatically executes the opening and closing of the valves of the high-pressure chamber and the low-pressure chamber in the device. The advantage is that the control accuracy is high, but the control system is complicated, and the system has high-pressure and low-pressure chambers. and become bulky;

[0020] Furthermore, electric transducers generally need to work horizontally when working in water. The vibrating piston is at one end of the cylinder. Because of the gravity of the vibrating piston, the vibrating coil will be subjected to an eccentric moment, and the gap between the coil and the magnet is as small as 0.3-0.6mm. Often due to the lack of effective measures for coil anti-flat core and displacement anti-overload, it is easy to cause frictional contact between the coil and the magnet. Reliable use; at the same time, due to the complex structure of the vibration system, the system has many modes, and the flatness of the system response is poor

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