SU626409A1 - Method of measuring electromechanical coupling factor of ultrasonic piezoelectric transducers - Google Patents

Description

where e is piezoelectric; post nng. : / - thickness

Then .KOiMnenaipyioT capacitance of the piezoplaCTiK-tbt piezoelectric transducer; t znoz zozbozhdayut it electrically im1: 1ulgom, g: and the resonant frequency. Ampl: record Ui of the received signal is recorded.

With iolaic co-M capacitance capacitance ;: piezoPlate, the transmission coefficient of the piezoelectric transducer is reflected. Z2 and ZQ volioso acoustic resistance and resonance: reoperator and medium: so: Steven o. So KaiK is the ratio of the amplitudes of electrically .x signals at the output of the piezoelectric transducer “ik” corresponds to the corresponding ratio: b; -: LureiHTOB transmission of the piezoelectric eezatel. . G.E.

This is determined by the coefficient of the electromechanical coupling;

Kf 1 /. .

- | | / - (i P

J / -G and

Since, in the proposed method, electric PM pulses are used

for; toastnost; and the ratio of the electromechanical coupling is determined by the amplitudes of the set values of the three-emitting part of the emitted acoustics: the pulses, this improves the accuracy of the Measurement by eliminating the influence of the radial oscillations of the piezo: transform; and the influence of the duration of the front on exciting nllus: 5.

F o

1. Glozman IT. A. Gezokeramika. M., “Energie, 1972, p. 67.

2. Melkanovich A. F., Perkhatoz V. G. Analysis of the immersion method for measuring steam; meters of converters, - Defectoscopy, L 2, 1973, p. 46. A method for measuring the ratio of an electromechanical coupling of ultrasonic piezoelectric transducers, which consists in the fact that the generator: initiates a controllable isez converter. The 1GM excitations oscillate and, according to the results of the analysis of the electrical signal, judge the coefficient of electromechanical communication, about the number of bodies, which, in order to improve the measurement accuracy. determine the amplitude of the pr p of an electrical signal, additionally; Go s.pala from the converter with a non-compensated and compensated capacitance of the piezoplates.