A technique for simultaneous velocity and concentration measurements
Abstract
A laser Doppler anemometer and a light-scatter technique proposed by Becker et al., (1967) were used to study concentration fluctuations in a smoke-seeded axisymmetric free jet expelled from a perspex nozzle having a smooth contraction of area ratio 16:1 and an exit diameter of 10 mm. The technique employed uses the intensity of light scattered from particles as a measure of the local concentration of seeded gas in a mixture with an unseeded gas. (The intensity of scattered light is proportional to the instantaneous concentration). The optical and signal processing systems are described, and the performance of the instrument is evaluated.
- Publication:
-
The Accuracy of Flow Measurements by Laser Doppler Methods
- Pub Date:
- 1976
- Bibcode:
- 1976afml.proc..505M
- Keywords:
-
- Anemometers;
- Density Measurement;
- Laser Doppler Velocimeters;
- Light Scattering;
- Velocity Measurement;
- Air Pollution;
- Flow Measurement;
- Free Jets;
- Gas Detectors;
- Nozzle Flow;
- Signal Processing;
- Smoke Detectors;
- Instrumentation and Photography