Process and arrangement for the measurement of physical...

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G01P 5/00 (2006.01) G01P 5/26 (2006.01) G01P 15/093 (2006.01)

Patent

CA 2175292

The invention is directed to a process for measuring physical values of light-scattering moving particles by means of laser Doppler anemometry and to a corresponding laser Doppler anemometer (LDA) with phase modulation. The object of providing a novel possibility for generating a moving intensity-modulated superimposition signal in the measured volume of a LDA which is based on an uncomplicated driving of the phase modulator (22) is met, according to the invention, in that the phase modulator (22) is driven by two sinusoidal driving signals with different frequencies (.omega.1,.omega.2) which are coupled so as to be fixed with respect to phase and frequency, wherein one frequency (.omega.2) is an integral multiple of the other frequency (.omega.1), and a filter frequency (fF) which is a common multiple of the two frequencies (.omega.1,.omega.2) is filtered out from the output signal of the receiver (4) by a bandpass filter (5). For this purpose, one of two sidebands occurring in the output signal of the receiver (4) is suppressed by the appropriate amplitude adjustment of the driving signals at the phase modulator (22). The invention is preferably used for measuring velocity in flowing media and for measurements of length and acceleration of solid surfaces.

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