Piezoelectric ultrasonic transducer with acoustic feedback function

Abstract

The invention discloses a piezoelectric ultrasonic transducer with the acoustic feedback function. The piezoelectric ultrasonic transducer with the acoustic feedback function comprises pre-tightening-force screws, a middle pressing block, an emitting piezoelectric ceramic element and a front pressing block, wherein the middle pressing block and the front pressing block are arranged at the two ends of the emitting piezoelectric ceramic element, the other end of the middle pressing block is further provided with a detecting piezoelectric ceramic element with the structure totally consistent with that of the emitting piezoelectric ceramic element, the other end of the detecting piezoelectric ceramic element is further provided with a rear pressing block, and the front pressing block, the middle pressing block and the rear pressing block press the emitting piezoelectric ceramic element and the detecting piezoelectric ceramic element through the pre-tightening-force screws; the detecting piezoelectric ceramic element is connected with an ultrasonic power source detecting circuit through an electrode element. The detecting piezoelectric ceramic element is used for generating vibration with the frequency the same as that of vibration on the outlet of the ultrasonic transducer, the ultrasonic power source detecting circuit is used for detecting the vibration of the outlet of the ultrasonic transducer so that whether the ultrasonic transducer works at a resonant frequency with the maximum amplitude can be fast judged, the judgment method is simple, and operation is very easy.

Description

technical field [0001] The invention relates to a piezoelectric ultrasonic transducer, relates to the frequency tracking technology of an ultrasonic transmitter, and more specifically relates to a piezoelectric ultrasonic transducer with an acoustic feedback function. Background technique [0002] The transducer is a device that uses the piezoelectric phenomenon of piezoelectric crystals (ceramics) to exchange electrical energy and mechanical energy. Ultrasonic transducers can emit high-power ultrasonic waves only when they resonate. A model of a piezoceramic transducer in the resonant frequency range can be obtained with figure 2 The equivalent circuit to represent: [0003] C 0 It is the static capacitance, which is the capacitance value between the two electrodes of the transducer without vibration. Its size is related to the dielectric constant, length, width, and thickness of piezoelectric ceramics (or crystals), and the general order of magnitude is 10 -9 F. R is ...

AI Technical Summary

Problems solved by technology

[0025] The purpose of the present invention is to solve the problem of inconvenient collection of mechanical resonance frequency in the prior art, and provide a kind of vibration amplitude signal that is simple to judge and can judge whether the transducer is working at the resonance frequency with the largest amplitude and has the function of acoustic feedback. Piezoelectric Ultrasonic Transducers

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