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Low-frequency flextensional acoustic pressure hydrophone

A hydrophone, flextensional technology, used in instruments, measuring ultrasonic/sonic/infrasonic waves, measuring devices, etc., to achieve the effect of receiving sensitivity

Inactive Publication Date: 2020-03-17
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Existing sound pressure hydrophones often adopt cylindrical, spherical, and composite rod-shaped structures. Although the sensitivity can meet the application requirements, there is still room for improvement in receiving sensitivity, so there is room for improvement in its structure

Method used

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  • Low-frequency flextensional acoustic pressure hydrophone
  • Low-frequency flextensional acoustic pressure hydrophone
  • Low-frequency flextensional acoustic pressure hydrophone

Examples

Experimental program
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Effect test

Embodiment 1

[0043] 1. Simulation stage

[0044] For the convenience of calculation, only one-half of the axisymmetric plane model is established. Taking the simulation with ANSYS 18.0 software as an example, the material of the 8 piezoelectric ceramic discs is PZT-4, and the unit type assigned is Plane13. The size parameters of any piezoelectric ceramic disc can be set as follows: the outer diameter is 50mm, the inner diameter is 17mm, and the thickness is 6mm (of course, the settings of the outer diameter, inner diameter, and thickness can be changed according to actual requirements). The rest of the structure is a metal structure, and the unit type assigned is Plane 42. The material of the prestressed bolts is stainless steel, and the rest of the parts are all made of aluminum alloy. The material of the near water field and the far water field is water, and the density is set to 1000kg / m 3 , the absorption coefficient is set to 0, and the element type used is Fluid 29, where the near-...

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Abstract

The invention belongs to the field of underwater acoustic equipment, and discloses a cylindrical flextensional acoustic pressure hydrophone which comprises a piezoelectric crystal pile formed by coaxially superposing eight piezoelectric ceramic rings. An upper aluminum alloy cover plate and a lower aluminum alloy cover plate are respectively arranged on and below the piezoelectric crystal pile andare connected with the piezoelectric crystal pile through transition bodies; an aluminum alloy shell is further arranged outside the side face of the piezoelectric crystal pile. The aluminum alloy shell is connected with the upper aluminum alloy cover plate and the lower aluminum alloy cover plate to form a surrounding space in a surrounding mode and thus a concave barrel type flextensional transducer structure is formed. In addition, an aluminum alloy receiving surface is further arranged outside the aluminum alloy shell. As for the projection of the aluminum alloy receiving surface on the plane perpendicular to the central axis, the outer edge of the projection is circular or regular n-sided. The cylindrical or approximately cylindrical flextensional acoustic pressure hydrophone is obtained by improving the structures, the arrangement modes, the materials and the like of all components in the hydrophone and is a two-dimensional omnidirectional acoustic pressure hydrophone and has high receiving sensitivity in a low frequency band.

Description

technical field [0001] The invention belongs to the field of underwater acoustic equipment, and more specifically relates to a low-frequency flexural-type sound pressure hydrophone, which can be used in the frequency range of 20 Hz to 4 kHz, especially a cylindrical high-sensitivity device with non-directionality in the horizontal direction. Sound pressure hydrophone. Background technique [0002] Sound waves are carriers of good information and energy in water that people have mastered. As an underwater energy conversion device, the underwater acoustic transducer plays an indispensable role in underwater detection and underwater acoustics related research. Among them, the transducer used to receive sound waves and convert them into electrical signals is called a hydrophone. At present, the requirements for sound pressure hydrophones tend to be continuous wave, low frequency, high sensitivity, and non-directional. Make it into an array, and use underwater acoustic signal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H3/12G01H11/08
CPCG01H3/12G01H11/08
Inventor 徐言哲范桂芬雷文付明吕文中
Owner HUAZHONG UNIV OF SCI & TECH
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