Method for measurement of temperature in rarefied gas flow using PLIF
Abstract
A method for measurement of temperature in rarefied gas flow has been developed. The flow field is visualized by planar laser-induced fluorescence (PLIF) of iodine molecules seeded in carrier gas. The fluorescence intensity is proportional to the number of molecules in the energy level excited by the laser beam. From the dependence of this number on the temperature, the local temperature can be decided from the ratio of the fluorescence intensities of two visualized images which are obtained by irradiations of laser beams with different wavelengths. This method allows to image the two-dimensional temperature distribution of the flow field by means of a laser sheet and a high-sensitivity CCD camera. In this paper, the method for selection of optimum combinations of two absorption lines in the transition of B(v-prime = 43)-X(v-double prime = 0) is provided theoretically, and this is verified by means of the temperature measurement of the flow field of a supersonic free jet in which temperature varies drastically.
- Publication:
-
JSME Transactions
- Pub Date:
- November 1992
- Bibcode:
- 1992JSMET..58.3275N
- Keywords:
-
- Gas Flow;
- Gas Temperature;
- Rarefied Gas Dynamics;
- Temperature Measurement;
- Flow Visualization;
- Fluorine;
- Laser Beams;
- Laser Induced Fluorescence;
- Supersonic Jet Flow;
- Temperature Distribution;
- Fluid Mechanics and Heat Transfer