2. Laser anemometry

I.L. Raskovskaya
National Research University (MPEI), Russia, Moscow.

About the principal opportunity of measurement local acoustic pressure in liquid using LDA interference scheme.

It is shown that in an ultrasonic field in a liquid, by using the interference scheme of a laser Doppler anemometer (LDA), it is possible to indirectly measure the vibrational velocity of a particle and the corresponding local excess pressure based on detection of laser radiation scattered by particles. The scattered radiation is a frequency-modulated signal, the informative parameter of which is the frequency deviation at the second harmonic of the acoustic field.
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