Visual modeling of laser Doppler anemometer signals by means of Moire fringes
Abstract
The employment of moire patterns to visually model interference phenomena in general and laser Doppler anemometer signals in particular is described. This modeling includes signals created in dual beam and reference beam anemometers by both single particles and particle pairs. The fringe model of the laser Doppler anemometer is also considered and moire patterns are employed to demonstrate the interference fringes in the crossover region of two intersecting laser beams. Gaussian beam properties are taken into account to allow the effects of improperly designed optical systems to be studied. Instructions for using computer generated transparencies to produce the different moire patterns are provided.
- Publication:
-
In Von Karman Inst. for Fluid Dyn. Advan. Meas. in Fluid Dyn
- Pub Date:
- 1977
- Bibcode:
- 1977amfd....2.....D
- Keywords:
-
- Doppler Effect;
- Laser Anemometers;
- Moire Effects;
- Velocity Measurement;
- Diffraction Patterns;
- Flow Measurement;
- Incident Radiation;
- Interference Grating;
- Laser Outputs;
- Light Scattering;
- Signal Analysis;
- Fluid Mechanics and Heat Transfer