METHOD OF MEASURING THE ACOUSTIC IMPEDANCE OF THE MEDIUM AND THE DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2018 - IPC G01N29/28 

FIELD: physics.

SUBSTANCE: using to measure the acoustic impedance of the medium. Summary of the Invention is that they carry out alternate immersion of the acoustic unit, made in the form of a piezoelectric plate that excites oscillations, into the investigated and reference medium, calculation of longitudinal and shear acoustic impedances on the basis of numerical values of the coefficients for the reference and study media. Next, measure the minimum voltage U_r, removed from the output of the acoustic block, the corresponding resonance frequency f_r, and the antiresonance frequency f_a, determined at the maximum voltage removed from the output of the acoustic unit when placed in the environment under study, the reference medium and air, further, by calculating the parameters of the equivalent electrical circuit of the piezoceramic plate, consisting of the capacitance C₁, in parallel connected with a chain of series connected capacitance C, inductance L, of the active resistance R, represented as two series-connected resistances R_I and R_V, where R=R_I+R_V, having determined the values of the voltages on the capacitance C and on the active resistance R, determine the acoustic impedance of the medium Z under investigation.

EFFECT: increase the accuracy and reliability of measuring the acoustic impedance of the medium.

4 cl, 3 dwg