Laser induced fluorescence thermometry with OH (2, 0) band excitation

Abstract

Measurement technique that can be adapted to high temperature and pressure environment in the rocket combustion chamber has been limited to qualitative. Therefore, establishment of a quantitative measurement technique of rocket combustion is demanded. Laser Induced Fluorescence (LIF) method targeting OH radical is the most promising measurement technique on rocket combustion. In the present study, we explored the temperature measurement method by LIF with promising OH(2,0) band measurement for high-pressure environment. The experiment was performed at atmospheric pressure for the verification test. In the present study, Laser Induced Fluorescence Spectroscopy (LIFS) temperature measurement using overlapping excitation line was found to feasible by applying the theory of Planer Laser Induced Fluorescence (PLIF)-2 line method. In addition, the LIFS measurement was found to be advantageous for measurement in high-pressure environment as it allowed discrimination from chemiluminescence.

Keywords

• laser-induced fluorescence spectroscopy
• oh(2,0) band
• 2-line method
• rocket combustion
• temperature
• instantaneous measurement