| 光谱学与光谱分析 |
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| Simulation and Analysis of Second-Harmonic Signal Based on Tunable Diode Laser Absorption Spectroscopy |
| LI Han, LIU Jian-guo, HE Ya-bai, HE Jun-feng, YAO Lu, XU Zhen-yu, CHEN Jiu-ying, YUAN Song, KAN Rui-feng* |
| Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China |
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Abstract Tunable diode laser absorption spectroscopy (TDLAS) is a new gas detection technique developed recently with high spectral resolution, high sensitivity and fast time response. The second-harmonic signal of wavelength modulation spectroscopy (WMS) is often used as the detection signal for gas concentration inversion. Using Simulink, a visual modeling and simulation platform, the authors simulated the WMS signal based on TDLAS, and got the second-harmonic signal by using lock-in amplifier algorithm. Digital orthogonal algorithm was studied in this paper. The relationship between second-harmonic signals and the modulation indexes was analyzed by comparing changes of second-harmonic under different modulation indexes, in order to find out the optimized parameters for second-harmonic detection.
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Received: 2012-07-18
Accepted: 2012-09-25
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Corresponding Authors:
KAN Rui-feng
E-mail: kanruifeng@aiofm.ac.cn
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