Density measurement in air with a saturable absorbing seed gas
Abstract
A method for making density measurements in a compressible flow by using off resonance laser induced fluorescence is studied. The seed molecule chosen for study is the iodine molecule which is excited with the 514.5 nm line of the argon ion laser whose output is frequency tuned, by as much as 3 GHz, relative to a strong iodine transition using an intracavity etalon. The theory which was developed to analyze the effect will be used in conjunction with two experiments being conducted to further study the method an acoustic resonance tube in which controlled perturbations about a uniform state are produced, and a small supersonic jet in which the conditions of the flow vary widely from point to point.
- Publication:
-
Stanford Univ. Report
- Pub Date:
- April 1982
- Bibcode:
- 1982stan.reptU....B
- Keywords:
-
- Acoustics;
- Argon Lasers;
- Compressible Flow;
- Density Measurement;
- Penetration;
- Aerodynamic Noise;
- Laser Induced Fluorescence;
- Molecular Excitation;
- Resonance Fluorescence;
- Resonant Frequencies;
- Fluid Mechanics and Heat Transfer