Laser anemometry. Improvement of accuracy by elimination of errors produced by large particles
Abstract
The accuracy of a laser anemometer was improved for flows with high velocity gradients. The instrument is based on a Doppler difference method, with which a velocity component can be measured at a point and the flow velocity is equated to the velocity of natural particles in the flow. The time difference for separate particles to tranverse the test volume was measured. The results lead to a statistical investigation of the level of photodetector signals. This analysis makes it possible to determine a relationship between the particle size and the signal amplitude, allowing for the particle size distribution.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- March 1974
- Bibcode:
- 1974STIN...7516845H
- Keywords:
-
- Anemometers;
- Instrument Errors;
- Laser Doppler Velocimeters;
- Particle Size Distribution;
- Accuracy;
- Flow Velocity;
- Supersonic Flow;
- Lasers and Masers