A flextensional transducer using a PVDF piezoelectric film

A flextensional transducer and piezoelectric film technology, which can be used in instruments, sound-producing instruments, etc., can solve problems such as inability to meet needs, and achieve the effects of improving energy conversion efficiency, low weight, and improving emission capability.
CN103646643AActive Publication Date: 2014-03-19武汉国科舰航传感科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
武汉国科舰航传感科技有限公司
Publication Date
2014-03-19

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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.
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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 can obtain 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 t...

Claims

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