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A flextensional transducer using PVDF piezoelectric film

A flextensional transducer and piezoelectric film technology, applied in the direction of instruments, sound-generating devices, etc., can solve problems such as not being able to meet needs, and achieve the effects of improving energy conversion efficiency, increasing emission area, and improving emission capability

Active Publication Date: 2016-04-20
武汉国科舰航传感科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, with the continuous increase of the transmitting power of the transducer and the reduction of the resonance frequency, the existing flextensional transducer can no longer meet the needs

Method used

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  • A flextensional transducer using PVDF piezoelectric film
  • A flextensional transducer using PVDF piezoelectric film
  • A flextensional transducer using PVDF piezoelectric film

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Embodiment Construction

[0031] The present invention will be further described below through specific embodiments and accompanying drawings.

[0032] figure 1 It is a schematic diagram of the structure of the flextensional transducer using PVDF piezoelectric film in this embodiment, including polyvinylidene fluoride (PVDF) film 1, positively polarized piezoelectric ceramic sheet 2, metal gasket 3, reverse electrode Piezoelectric ceramic sheet 4, mass block 5, fixed block 6, fixed screw 7, tension screw 8 and prestressed screw 9. Among them, the positively polarized piezoelectric ceramic sheet 2, the metal spacer 3 and the reversely polarized piezoelectric ceramic sheet 4 together constitute a piezoelectric ceramic chip stack, and the electrodes are drawn out through the metal spacer, and all the positive electrodes are connected to each other, and the negative electrodes are connected to each other. The PVDF film 1 forms a closed cavity and wraps the stack of piezoelectric ceramic wafers. Its three-...

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Abstract

The invention relates to a flextensional transducer using a PVDF piezoelectric film. The flextensional transducer comprises a piezoelectric ceramic wafer stack and a PVDF film. The PVDF film surrounds the piezoelectric ceramic wafer stack. A connecting piece is arranged between the PVDF film and the piezoelectric ceramic wafer stack. The flextensional transducer further comprises a device for enabling the PVDF film to generate prestress. The metallic housing of a conventional flextensional transducer is replaced by the PVDF film. The PVDF film and the piezoelectric ceramic wafer stack are used as sensitive elements. The PVDF film uses a film flexural vibration mode under a simple boundary condition. The piezoelectric ceramic wafer stack uses a longitudinal vibration mode. A wide bandwidth can be acquired by mode coupling so as to achieve broadband transmission sound waves. The flextensional transducer has characteristics of low frequency, a wide band, high receiving sensitivity, large acoustic radiation power, and horizontal omnidirectional directivity.

Description

technical field [0001] The invention belongs to the technical field of underwater acoustic detection, and in particular relates to a novel flexural transducer which utilizes a PVDF piezoelectric film to replace the metal shell of the flexural transducer and utilizes the piezoelectric effect to send and receive signals to realize underwater detection. Background technique [0002] The flextensional transducer (flextensional transducer for short) is a compact underwater acoustic detection transducer that obtains low-frequency, high-power and broadband acoustic signals. The shell is usually a curved body of inversion, a curved body of revolution, or an ellipse in translation. The working principle of the flextensional transducer is: use the longitudinal stretching vibration of the piezoelectric ceramic chip stack to excite the shell to perform bending vibration, and couple into a bending and stretching vibration mode. Effective low-frequency radiation can be obtained from the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10K9/122
Inventor 秦雷王丽坤刘静静
Owner 武汉国科舰航传感科技有限公司
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