Focusing ultrasonic transducer and producing method thereof

Abstract

The invention discloses a focusing ultrasonic transducer which sequentially comprises a matching layer, a piezoelectric vibrator layer and a backing block. The piezoelectric vibrator layer is made of a piezoelectric single crystal / polymer 1-3 composite material; the piezoelectric single crystal is lead magnesium niobate-lead titanate with a chemical composition of (1-x) Pb (mg1 / 3Nb2 / 3) O3-xPbTiO3, the crystallographic direction is the (001) direction; or a lead indium niobate-lead magnesium niobate-lead titanate with a chemical composition of xPb (In1 / 2Nb1 / 2) O3-yPb (Mg1 / 3Nb2 / 3) O3- (1-x-y) PbTiO3, the crystallographic direction is the (001) direction; wherein 0<x<1, 0<y<1, and 0<x+y<1. The focusing ultrasonic transducer is simple in structure, convenient to prepare and low in manufacturing cost, can obtain high sensitivity, bandwidth and resolution ratio, and has a broad application prospect in the technical fields of medical ultrasonic imaging and industrial nondestructive testing.

Description

technical field [0001] The invention relates to a focused ultrasonic transducer and a preparation method thereof. Background technique [0002] Ultrasonic transducer is a key component of ultrasonic imaging and ultrasonic detection systems, which realizes the conversion between electrical energy and acoustic energy (mechanical energy). In medicine, ultrasonic transducers are often called probes. Piezoelectric materials are the transducing elements of ultrasonic transducers, which are crucial to the performance of ultrasonic transducers and even the performance of the entire ultrasonic imaging system. In the past few decades, there have been many improvements and enhancements in the structural design of ultrasonic transducers, but PZT-based piezoelectric ceramics have always been used as transducer materials. This is due to the good piezoelectricity of PZT ceramics. Performance, on the other hand, is due to the low production cost of PZT ceramics and the ease of mass product...

AI Technical Summary

Problems solved by technology

However, new piezoelectric single crystal materials (such as PMNT, PIMNT single crystal) are prone to brittle structures, and the planar piezoelectric vibrators cut out cannot obtain focused piezoelectric vibrators by simply applying external forces. In addition, the performance of crystal materials shows Anisotropy, the focused single crystal piezoelectric vibrator can be obtained by grinding, but the radiation surface deviates from the crystal plane with the best piezoelectric performance, and the performance of the piezoelectric vibrator will inevitably be greatly reduced. Therefore, the new piezoelectric single crystal can be used in the focused ultrasonic The application on the transducer is still relatively difficult, and a new design and manufacturing method is required to realize

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