Abstract

A real-time particle parameter's distribution measuring method is proposed. Particles are vibrated by sinusoidal sound waves, and the speed of the vibration is detected using the optics of a conventional laser Doppler velocimeter. A small segment of detected signal is sampled, and its power spectrum is calculated. This process is repeated several times, and the results are averaged and properly restored. Then the shape of the resulting power spectrum represents the distribution of a parameter of the particles, such as the diameter. The principle, concrete construction, proper signal processings of the system, and some experimental results are shown.

© 1978 Optical Society of America

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