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Intracavity Rayleigh-Mie scattering for multipoint, two-component velocity measurement
Daniel Bivolaru1, Paul M Danehy, Joseph W Lee
1NASA Langley Research Center, Advanced Sensing and Optical Measurement Branch, Virginia 23681, USA. d.bivolaru@larc.nasa.gov
Optics Letters
|May 12, 2006
Summary
This study introduces a novel Doppler velocimeter for simultaneous multipoint velocity measurements. The system enhances signal intensity by recirculating scattered light, improving measurement accuracy.
Area of Science:
- Fluid dynamics
- Optical measurement techniques
- Laser Doppler velocimetry
Background:
- Accurate measurement of fluid velocity is crucial in various scientific and engineering fields.
- Existing Doppler velocimetry techniques can be limited by signal intensity and measurement speed.
Purpose of the Study:
- To describe a new simultaneous multipoint, two-component Doppler velocimeter.
- To demonstrate its capability for single-pulse velocity vector measurements.
Main Methods:
- Utilized two optical cavities: a Fabry-Perot etalon and a light-collecting/recirculating cavity.
- Collected Rayleigh-Mie-scattered light from the measurement volume in opposing directions.
- Performed single-pulse measurements of two orthogonal velocity components.
Main Results:
- Successfully demonstrated single-pulse, two-component velocity vector measurements in a supersonic free jet.
- Recirculating rejected light increased signal intensity by a factor of 3.5.
- Achieved simultaneous multipoint velocity measurements.
Conclusions:
- The developed Doppler velocimeter is effective for precise, high-speed fluid velocity measurements.
- The light recirculation method significantly enhances signal intensity.
- This technique offers a promising advancement for fluid dynamics research.
