| 光谱学与光谱分析 |
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| Measurement of Nonuniform Temperature and Concentration Distribution by Absorption Spectroscopy Based on Least-Square Fitting |
| SONG Jun-ling, HONG Yan-ji, WANG Guang-yu, PAN Hu |
| State Key Laboratory of Laser Propulsion & Application, Academy of Equipment, Beijing 101416, China |
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Abstract The measurement of nonuniform temperature and concentration distributions was investigated based on tunable diode laser absorption spectroscopy technology. Through direct scanning multiple absorption lines of H2O, two zones for temperature and concentration distribution were achieved by solving nonlinear equations by least-square fitting from numerical and experimental studies. The numerical results show that the calculated temperature and concentration have relative errors of 8.3% and 7.6% compared to the model, respectively. The calculating accuracy can be improved by increasing the number of absorption lines and reduction in unknown numbers. Compared with the thermocouple readings, the high and low temperatures have relative errors of 13.8% and 3.5% respectively. The numerical results are in agreement with the experimental results.
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Received: 2012-12-16
Accepted: 2013-03-18
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Corresponding Authors:
SONG Jun-ling
E-mail: songjl@mail.ustc.edu.cn
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