POWER SPECTRUM OF AN INTERFEROMETER SIGNAL IN EXPERIMENTS ON SOUNDING OF A TURBULENT WATER STREAM WITH PULSATING VELOCITY

The paper is related to studies of a turbulent medium by the sounding method with the interferometric reception. We performed a theoretical analysis of a multiplicative interferometer response to noise quasi-monochromatic emission, disturbed by a turbulent water stream. The effect of turbulent pulsations of the stream velocity on output interferometer signal was considered. Spectral analysis of the output interferometer signal allowed to perform the diagnostics of the propagation media. Particularly, it was shown, that the interferometer power spectrum carries information on the spatial spectrum of fluctuations of cavity bubbles concentration and on the average stream velocity. The theoretical evidence has been compared with the results of interferometric experiments on ultrasonic sounding of the water stream inside a pipe.