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| Measurements of Gas Parameters Based on the Laser Absorption Spectroscopy in Non-Uniform Flow |
| QU Dong-sheng, HONG Yan-ji, WANG Guang-yu, WANG Ming-dong, PAN Hu |
| State Key Laboratory of Laser Propulsion & Application, Academy of Equipment, Beijing 101416, China |
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Abstract In order to explore the application of laser absorption spectroscopy in the non-uniform flow, a new strategy that provides quantitative measurements of gas parameters in non-uniform environments are put forward. After evaluating the range of temperature in the field and choosing the appropriate transitions whose strengths that scale linearly with temperature, the H2O mole-fraction-weighted path-average temperature and geometric path-average H2O mole fraction can be quantitatively measured. The simulated results from two-temperature and Gaussian-temperature distribution model show the availability and reliability of this method. Compared with theoretical value, the relative errors of measured results in the two-temperature distribution model are 0.82% and 1.10% while the most relative errors in the Gaussian-temperature distribution model are 0.9% and 3.6%.
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Received: 2016-04-13
Accepted: 2016-08-29
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