FIELD: measurement technology.
SUBSTANCE: used for measuring the frequency dependence of the reflection coefficient of sound from the surface in laboratory and field conditions at various angles of incidence of a sound wave. Essence of the invention is that the emitter, the surface under study and the receiver are arranged so that the first signal according to its arrival time to the receiving point is the signal from the surface under study, the radiator is excited by means of the linearly frequency-modulated signal, the emitter current and receiver voltage are recorded and the complex frequency dependence of the transfer impedance of the emitter-receiver pair in the reverberation sound field is determined. When processing the dependence by means of the sliding complex weighted averaging, the complex frequency dependence is obtained, in which there are no oscillations due to the reflected signals, and the dependence, in which the oscillation is preserved from the first arrival of the reflection, and the oscillations from the later reflections are suppressed. According to the dependences obtained, the frequency dependence of the complex reflection coefficient is determined.
EFFECT: increased accuracy of measuring the reflection coefficient by means of eliminating the effect of foreign reflected signals, providing the ability to measure the detailed (continuous) frequency dependence of the reflection coefficient.
1 cl, 6 dwg
