Abstract：In the trace gases detection system with tunable diode laser absorption spectroscopy (TDLAS) technology, the measurement of trace gases concentration was influenced by the laser wavelength drift resulting from the change in ambient temperature and noise of laser control electronics. With open-path TDLAS ammonia concentration detection system as an example, in the present paper the scanning law of laser center wavelength with current was analyzed, and the adaptive locking method of scanning laser center wavelength was presented based on controlling laser current. The aligning algorithm of measurement spectroscopy with calibration reference spectroscopy was studied. The open-path ammonia concentration was achieved in real time. Experiment results show that the precision and the stability of retrieving the concentration of trace gases were improved satisfactorily by wavelength locking. The variation of ammonia concentration has an obvious diurnal periodicity, which increased in rush hour time and got to the maximum at noon, then decreased at night. The system detection limit is about 3.8 mg·m-3·m.
王立明，张玉钧*，何 莹，尤 坤，刘建国，刘文清 . 痕量气体激光检测系统波长锁定技术研究[J]. 光谱学与光谱分析, 2012, 32(04): 910-914.
WANG Li-ming, ZHANG Yu-jun*, HE Ying, YOU Kun, LIU Jian-guo, LIU Wen-qing . Study on Wavelength Locking Technology in Trace Gases Detection System Based on Laser Techniques . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2012, 32(04): 910-914.
[1] Fried A, Sewell S, Henry B, et al. Journal of Geophysical Research, 1997，102: 6253. [2] Werle P. Spectrochimica Acta, 1998, A54: 197. [3] Mücke R, Werle P, Slemr F. Proceedings of SPIE, 1991，1433: 136. [4] Reid J, Labrie D. Appl. Phys. B, 1981, 26: 203. [5] Werle P. SPIE, 1994，2112: 19. [6] Roller C, Fried A, Walega J, et al. Appl. Phys. B, 2006，82: 247. [7] WANG Xiao-mei, ZHANG Yu-jun, LIU Wen-qing, et al(王晓梅，张玉钧，刘文清，等). Optical Technique(光学技术), 2006, 32(5): 717. [8] Randy D M. Rev. Sci. Instrum, 1992，63(5): 2922. [9] SONG Zheng-fang, FAN Cheng-yu(宋正方，范承玉). High Power Laser and Particle Beams(强激光与粒子束), 1994，6(3): 469. [10] Kosterev A A, Tittel F K. Appl. Opt.，2004, 43: 6213. [11] TANG Dong-lin, WANG Ying, GUO Feng, et al(唐东林, 王 莹，郭 峰，等). Chinese Journal of Sensors and Actuators(传感技术学报), 2010, 23(4): 458. [12] De Tommasi E, Casa G, Gianfrani L. Appl. Phys. B，2006，85: 257. [13] Flesch T, Wilson J D, Yee E. Journal of Applied Meteorology，1995，34: 1320. [14] Sommer S G, McGinn S M, Flesch T K. Europ. J. Agronomy, 2005，23: 1. [15] KAN Rui-feng, DONG Feng-zhong, ZHANG Yu-jun, et al(阚瑞峰，董凤忠，张玉钧，等). Chinese Physics(中国物理)，2005, 14(9): 1904. [16] TANG Yuan-yuan，LIU Wen-qing，KAN Rui-feng, et al(汤媛媛，刘文清，阚瑞峰，等). Chinese Optical Society Annual Conference(中国光学学会2010年学术年会), 2010, 7656: 7656F.
