Abstract：To solve the problem that electrical impedance of the transducer cannot be measured accurately by the impedance analyzer with continuous wave in small size cavity, a transducer impendence measurement method based on pulse sine signal excitation under high hydrostatic pressure is proposed. Based on the sampling resistance method, the number of sinusoidal pulses and measurable frequency range are determined by the size of the cavity size to effectively eliminate the influence of the boundary reflection. The admittance is calculated while the voltages upon the transducer and the sampling resistance are collected and the phase difference is obtained by Fourier transform. By comparing the admittance values of the same transducer stimulated by pulse wave signal and continuous wave signal, sinusoidal pulse method is proved to be a better choice to measure the admittance characteristics of transducers in a limited space. And the variation curve of admittance characteristics is measured by pulse method at 0～10 MPa hydrostatic pressure. The experimental results show that as the pressure increases, the resonant frequency of the transducer shifts, and the diameter of the admittance circle decreases.
2020, Vol. 41 
