Distortion of LDA fringe pattern by tracer perticles
Abstract
For precise flow velocity measurements Laser Doppler Anemometry (LDA) is used. The LDA method has the advantage not to be intrusive and to be able to discriminate between forward and reverse velocities. Experimental investigations which show that the particle passage through the laser beams shortly before the point of superposition yields a distorted LDA fringe pattern are summarized. The period length of an individual LDA burst-passing the center of the measuring volume at the same time varies according to the distortion of the fringe spacing.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- March 1990
- Bibcode:
- 1990STIN...9110286R
- Keywords:
-
- Diffraction Patterns;
- Imaging Techniques;
- Laser Doppler Velocimeters;
- Velocity Measurement;
- Flow Velocity;
- Fringe Multiplication;
- Laser Applications;
- Laser Beams;
- Particle Tracks;
- Signal Distortion;
- Lasers and Masers