Double resonant vibrations and double promptings longitudinal vibration transducer

Abstract

The invention provides a double resonance double-excitation longitudinal vibration transducer, comprising a radiation head (1), a front crystal stack (2), intermediate mass (3), a back crystal stack (6), a tail load (7), a first insulation spacer, a second insulation spacer, a third insulation spacer, a forth insulation spacer, a nut (8) and a prestressed screw (12). By adjusting the series / parallel condition between each piezoelectric ceramic element in the front crystal stack (2) and the back crystal stack (6) and adjusting the connection mode of positive and negative electrodes of the front crystal stack (2) with the positive and the negative electrodes of the back crystal stack (6), a broadband emission transducer or a narrow-band high sensitivity emission transducer can be obtained respectively. The double resonance double-excitation longitudinal vibration transducer provided by the invention is characterized by low mechanical quality factor Qm, wide frequency band, less fluctuation and high sensitivity, and can be used as a broadband or narrow-band sound source in various detecting sonars, unmanned underwater vehicles or underwater communicators.

Description

technical field [0001] The invention relates to a transducer, especially a double-resonance double-excitation longitudinal-vibration transmitting transducer. This type of transducer can be used as various detection sonars, underwater unmanned aerial vehicles and underwater communication equipment. broadband or narrowband sound sources. Background technique [0002] In the field of underwater acoustics, with the development of modern sonar technology and weapon equipment technology, as well as the rapid development of modern signal processing technology, electronic technology, communication technology and computer technology, more and more requirements have been proposed for transducers and transducer arrays. high demands. Broadband transducer technology plays an increasingly important role in subsequent signal processing. Higher requirements are placed on the frequency band in many engineering projects. The transducer is a window for sensing physical quantities such as so...

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Problems solved by technology

In the article "Finite Element Design of Dual-excitation Broadband Transducer" published in the third issue of "Acoustics and Electronic Engineering" in 2003, Sun Haoguang and others mentioned that two crystal stacks are used to achieve broadband. The front crystal stack is two pieces connected in series. The rear crystal stack is 4 pieces in parallel, and then the front and rear crystal stacks are connected in parallel. As a result, the response of the transducer fluctuates above 5dB, and the frequency band fluctuates greatly. It can be seen that it is difficult to make the difference between the two resonances in actual simulation calculations and experiments. The fluctuation between -3dB

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