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.
李 晗，刘建国，何亚柏，何俊峰，姚 路，许振宇，陈玖英，袁 松，阚瑞峰* . 可调谐二极管激光吸收光谱二次谐波信号的模拟与分析 [J]. 光谱学与光谱分析, 2013, 33(04): 881-885.
LI Han, LIU Jian-guo, HE Ya-bai, HE Jun-feng, YAO Lu, XU Zhen-yu, CHEN Jiu-ying, YUAN Song, KAN Rui-feng* . Simulation and Analysis of Second-Harmonic Signal Based on Tunable Diode Laser Absorption Spectroscopy. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2013, 33(04): 881-885.
[1] Curl R F, Tittel F K. Annu. Rdp. Prog. Chem., Sect. C, 2002, 98：219. [2] XU Zhen-yu, LIU Wen-qing, KAN Rui-feng，et al(许振宇，刘文清，阚瑞峰，等). Journal of Atmospheric and Environmental Optics(大气与环境光学学报), 2011, 6(2)：95. [3] Werle P. Spectrochimica Acta Part A, 1998, 54：197. [4] TU Xing-hua, ZHOU Jie(涂兴华，周 洁). Joumal of Nanjing University of Posts and Telecommunications·Natural Science(南京邮电大学学报·自然科学版), 2009, 29(5)：46. [5] Philippe L C, Hanson R K. Applied Optics, 1993, 32(30): 6090. [6] Liu J T C, Jeffries J B, Hanson R K. Applied Physics B, 2004, 78：503. [7] Chang L S. Development of a Diode Laser Sensor for Measurement of Mass Flux in Supersonic Flow. TSD-184, Stanford University, 2011. [8] Pawel Kluczynski, Ove Axner. Applied Optics, 1999, 38(27)：5803. [9] HUANG Yong-an, MA Lu, LIU Hui-min(黄永安, 马 路, 刘慧敏). MATLAB 7.0/Simulink 6.0 Modeling Simulation Development and Senior Engineering Application(MATLAB 7.0/Simulink 6.0建模仿真开发与高级工程应用). Beijing: Tsinghua University Press(北京：清华大学出版社), 2005. [10] HAN Li-zhu, WANG Hua(韩利竹, 王 华). MATLAB Electronic Simulation and Application(MATLAB电子仿真与应用). Beijing: National Defence Industry Press(北京：国防工业出版社), 2003.
