Study on Line CARS for Temperature Measurement in Combustion Flow Field
LI Ren-bing1,2, SU Tie2, ZHANG Long2, BAO Wei-yi2, YAN Bo2, CHEN Li2, CHEN Shuang2
1. Science and Technology on Scramjet Laboratory，China Aerodynamics Research and Development Center, Mianyang 621000, China 2. Facility Design and Instrumentation Institute, China Aerodynamics Research and Development Center, Mianyang 621000, China
Abstract：Some laser beams meet at a single point by a convex len in normal coherent anti-Stokes Raman scattering (CARS), and the CARS signal with temperature information of the focal piont yields under phase matching. Normal CARS can only get the temperature of one spatial piont in one measurement, which can not meet the needs of deep research on combustion flow field. In order to get more information in one test and improve the measuring capacity of CARS, line CARS (L-CARS) was presented. In L-CARS, convex lens are replaced by cylindrical convex lens to get a focal line, and nearly all the points on the line meet the phase matching. So, the CARS signal of each point on the line yield in one test. Cylindrical convex lens are also used in subsequent beam path to focus the CARS signals into spectrometer, and ICCD camera transfers the signals to computer to acquire the temperature of each point. Then, the measuring capacity of CARS is advanced from piont measuring to line measuring. Experimental results based on plain flame furnace suggest that L-CARS can acquire about 200 points’ temperatures effectively in one test, and the length of the measuring line is about 3.6mm. The spatial resolution is about 18μm and the uncertainty is less than 7%, which is as the same as the ordinary CARS’s.
Key words：Laser spectrum;Temperature measurement;Flow field diagnosis;Line CARS;Experimental study
李仁兵1,2，苏 铁2，张 龙2，鲍伟义2，闫 博2，陈 力2，陈 爽2 . 燃烧流场线CARS测温技术研究 [J]. 光谱学与光谱分析, 2016, 36(12): 3968-3972.
LI Ren-bing1,2, SU Tie2, ZHANG Long2, BAO Wei-yi2, YAN Bo2, CHEN Li2, CHEN Shuang2 . Study on Line CARS for Temperature Measurement in Combustion Flow Field . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2016, 36(12): 3968-3972.
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