STUDY OF THE NATURE OF THE CHANGE IN THE SIGNAL OF A LASER VELOCITY METER DEPENDING ON THE DIRECTION OF RADIATION RECEPTION

Abstract

The study of the nature of the
change in the signal parameters of a laser Doppler velocity meter depending on the direction of scattered
radiation reception was carried out. The features of the change in the parameters of the Doppler signal
depending on the direction of scattered radiation reception were established for the case when the laser
beams have a linearly coherent, linear mutually orthogonal, circularly coherent and circularly mutually
orthogonal polarization state. The obtained results were experimentally verified. It was experimentally
confirmed that due to the fact that the phase of the Doppler signal changes its sign to the opposite with
linearly coherent polarization of the laser beams, mutual compensation of the signals can be observed.
This can lead to the fact that the Doppler signal will have a low modulation depth and signal/noise ratio.
The results of the study can be used in the design of differential-type laser Doppler velocity meters.
Keywords: laser, speed, measurement, intensity, polarization, phase

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