Speckle photography of a turbulent density field
Abstract
A modification of speckle photography makes it possible to measure the deflection of laser light in a flow with varying gas density. With an suitably short exposure time, as provided by a ruby laser, the deflection can be measured in a field with fluctuating gas density. The method is demonstrated for the case of a turbulent helium jet exhausting into the ambient atmosphere.
- Publication:
-
IN: Optical methods in dynamics of fluids and solids; Proceedings of the International Symposium
- Pub Date:
- 1985
- Bibcode:
- 1985omdf.proc..159F
- Keywords:
-
- Density Distribution;
- Optical Measurement;
- Photographic Recording;
- Speckle Patterns;
- Turbulent Jets;
- Data Reduction;
- Helium;
- Laser Applications;
- Ruby Lasers;
- Fluid Mechanics and Heat Transfer