Cascade and parallel piezoelectric composite material-based cylindrical transducer

Abstract

The invention discloses a cascade and parallel piezoelectric composite material-based cylindrical transducer, which comprises a support with an underpan, an annular backing, an end cover and a plurality of wafers, wherein the wafers are cascade and parallel piezoelectric composite wafers, are uniformly arranged on the outer side of the annular backing along the periphery and are polarized along the radial direction of the ring; insulating washers are cushioned on and under a tubular sensitive element consisting of the backing and the wafers; the tubular sensitive element is sleeved and fastened on the underpan of the support; and the end cover is fixed at the upper end of the support and on the insulating washer on the sensitive element. The transducer adopts a multi-wafer annular array as the sensitive element, the vibration of the wafers adopts a thickness model, the working frequency is higher than the radial vibration frequency of a round tube, and the high-frequency sound wave emission can be realized; moreover, because the wafers are mode of the cascade and parallel composite material, the electro-mechanical coupling factor of the composite material is high, the frequency band thereof is broad, and the transducer has high sensitivity and broad working frequency band; therefore, the transducer has the characteristics of high frequency, high sensitivity, broad band and level omnidirection.

Description

technical field [0001] The invention belongs to the technical field of underwater acoustic detection, and relates to an important part used by sonar—an underwater acoustic transducer, in particular to a device for underwater acoustic detection by using the piezoelectric effect of series-parallel piezoelectric composite materials to transmit and receive underwater acoustic signals transducer. Background technique [0002] The underwater acoustic transducer is a device that converts sound energy and electrical energy into each other, and can be widely used in underwater communication, detection, target positioning, tracking, etc. Key components of sound waves. Underwater detection, identification, communication, as well as marine environment monitoring and the development of marine resources are inseparable from underwater acoustic transducers. Transducers can be divided into transmitting type, receiving type and dual-purpose type. Transducers that convert electrical signal...

AI Technical Summary

Problems solved by technology

[0017] To sum up, the current cylindrical transducer mainly uses the radial vibration mode of the ceramic (or PVDF) tube. Large-scale piezoelectric tubes (diameter less than 10mm) are difficult to process, so the operating frequency of the tubular cylindrical transducer is difficult to achieve high frequency

Although the high-frequency piezoelectric cylindrical array transducer has a high operating frequency, its transmission frequency bandwidth is relatively narrow because its vibrator is made of piezoelectric ceramics.

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