Piezoelectric composite material of wide-band transducer

Abstract

The invention discloses a piezoelectric composite material for a broadband transducer, and belongs to the technical field of the piezoelectric material. The piezoelectric composite material comprises a piezoelectric crystal and polymers; wherein, the piezoelectric crystal is divided into an upper part and a lower part; the upper part of the piezoelectric crystal is provided with a plurality of piezoelectric crystal pillars which are uniformly arranged; the lower part of the piezoelectric crystal is a piezoelectric substrate; the heights of the piezoelectric crystal pillars present periodical differences, so that the thickness of the substrate is not uniform; the polymers are filled between the piezoelectric crystal pillars; and the polarization direction of the piezoelectric crystal pillars and the piezoelectric substrate is along the thickness direction of the piezoelectric composite material. Due to the different resonance frequencies of the piezoelectric crystalline pillars, the bandwidth of the piezoelectric composite material can be increased by changing the heights of the piezoelectric crystal pillars. The Q value of the piezoelectric composite material can reach below 10, and the composite material is applicable to the preparation of the broadband transducer.

Description

technical field [0001] The invention relates to a piezoelectric material and its device technology, in particular to a piezoelectric composite material for a broadband transducer used in underwater sound and ultrasonic detection. Background technique [0002] Piezoelectric composite materials are mainly used in two aspects of underwater acoustic transducers and ultrasonic transducers. The underwater acoustic transducer is a device that converts sound energy and electrical energy into each other. Its status is similar to that of an antenna in radio equipment, and it is a key device for transmitting and receiving sound waves underwater. Underwater detection, identification, communication, as well as marine environment monitoring and the development of marine resources are inseparable from underwater acoustic transducers. Ultrasonic transducers are mainly used in medical ultrasonic imaging, non-destructive testing, etc. The principle is the same as that of underwater acoustic ...

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Problems solved by technology

It has the characteristics of both parallel and series piezoelectric composite materials, stable performance, not easy to deform under heat and external impact, simple manufacturing process, and because the piezoelectric composite material introduces a polymer phase, the loss of the composite material increases, so in The Q value is reduced to a certain extent, but the Q value of the piezoelectric composite material is still above 10, and it is impossible to prepare a broadband transducer

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