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Working frequency expansion method of resonant cavity hydrophone

A technology for working frequency and hydrophones, applied in instruments, measuring devices, measuring ultrasonic/sonic/infrasonic waves, etc., can solve the problems of not being able to fully satisfy the rapid design and preparation of hydrophones, many design variables, and high design costs, and achieve Effects of high sensitivity, improved design accuracy, and simplified design

Active Publication Date: 2020-08-18
TIANJIN UNIV
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Problems solved by technology

[0004] This type of resonant hydrophone uses the resonance of the solid element itself or the resonance of the liquid cavity, and its resonant frequency is closely related to the size of the shell and material properties. Therefore, there are many design variables, complex structures, and high design costs. Meet the needs of rapid design and preparation of various frequency hydrophones

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  • Working frequency expansion method of resonant cavity hydrophone
  • Working frequency expansion method of resonant cavity hydrophone
  • Working frequency expansion method of resonant cavity hydrophone

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Embodiment Construction

[0027] In order to make the purpose, technical solution and advantages of the present invention clearer, the implementation manners of the present invention will be further described in detail below.

[0028] The hydrophone based on the resonant cavity is composed of an empty shell, which is immersed in water, and a microphone is fixedly arranged inside the empty shell, and the microphone collects sound signals projected from external waters. The shape and size of the shell are determined according to the expected frequency of hydroacoustic detection. The empty shell has no sensitive materials such as piezoelectric ceramics and does not need an impedance matching layer, and can be made by 3D printing, machining, injection molding and other processes. When forming a multi-frequency hydrophone, it can also be composed of a plurality of hydrophones (that is, include a plurality of hollow shells).

[0029] 1. When the working frequency f0 of the hydrophone is less than or equal t...

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Abstract

The invention discloses a working frequency expansion method of a resonant cavity hydrophone. When the working frequency of the hydrophone is less than or equal to a threshold value; the method comprises the following steps: the hydrophone comprises a cylindrical spiral pipeline device or a three-dimensional spiral pipeline device or a planar spiral pipeline device, a microphone laying position, ascanning spiral line, a power supply and signal line, a cover for fixing a microphone, a hole for inserting the microphone, a cross section of the planar spiral pipeline device and the microphone; intercepting the three-dimensional spiral pipeline device or the planar spiral pipeline device by using a plane vertical to the scanning spiral line through the arrangement position of any point on thesurface of the cylindrical spiral pipeline device or the three-dimensional spiral pipeline device or the planar spiral pipeline device to obtain a sectional view; the arc lengths of the spiral lines under different conditions are calculated through numerical values, and the working frequency is continuously adjusted by adjusting the arc lengths.

Description

technical field [0001] The invention relates to the field of hydrophones, in particular to a method for expanding the working frequency of a resonant cavity hydrophone. Background technique [0002] Hydrophones can convert underwater acoustic signals into electrical signals, and are widely used in underwater acoustic detection, ranging, communication, leak detection of liquid-filled pressurized pipelines, etc. Sensitivity is one of the most important performance indicators of hydrophones. High sensitivity can lead to higher signal-to-noise ratio and longer detection and communication distances. [0003] In order to improve the sensitivity of the hydrophone, on the one hand, new materials with higher piezoelectric coefficients are used to improve the piezoelectric conversion efficiency; The coupling efficiency of vibrations or the coupling efficiency of dynamic strain in the optical fiber that improves the sound pressure to the fiber optic hydrophone. When a hydrophone oper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H11/06
CPCG01H11/06Y02A90/30
Inventor 黄新敬李健陈世利封皓张宇
Owner TIANJIN UNIV
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