Relativistic effects of laser doppler velocimeters using one light beam with two frequencies
Abstract
Relativistic effects of laser Doppler velocimeters (LDV's) are discussed and novel LDV systems are proposed. If the direction of the scattered light makes a right angle with the flow direction, relativistic effects completely disappear no matter how high the velocity of a moving particle becomes. The proposed LDV's involve that the velocity can be measured from one scattered light beam with two different single frequencies. It is also predicted that the usual optical heterodynedetection techniques can be made applicable to measure even ultrahigh velocities up to the region where relativistic effects should be taken into account.
 Publication:

Optics Communications
 Pub Date:
 February 1975
 DOI:
 10.1016/00304018(75)900401
 Bibcode:
 1975OptCo..13..194O
 Keywords:

 Beat Frequencies;
 Flow Measurement;
 Laser Doppler Velocimeters;
 Light Beams;
 Relativistic Effects;
 Frequency Response;
 Light Scattering;
 Optical Heterodyning;
 Velocity Measurement;
 Instrumentation and Photography