Abstract：Tunable diode laser absorption spectroscopy (TDLAS) is a new method to detect trace-gas qualitatively or quantificationally based on the scan characteristic of the diode laser used to obtain the absorption spectroscopy in the characteristic absorption region. It needs to be combined with a long absorption path in the ambient trace-gas measurements. TDLAS is a new trace gas detective method developed with the combination of a tunable diode laser source and a long absorption path; it has significant advantages not only in the sensitivity but also in rapidity of response. It has been widely used in many atmospheric trace-gases detection, ground trace-gas detection and, gas leakage detection. On-line calibrating is necessary to most trace gas monitor, and in the present paper the authors introduced a simple and accurate method, analyzed it in the theory, and proved it’s feasibility in the experiment.
[1] Nadezhdinskii A, Berezin A, Chernin S, et al. Spectrochim. Acta A, 1999,55: 2083. [2] Amato F D, Mazzinghi P, Castagnoli F. Appl. Phys. B, 2002, 75: 195. [3] Nelson D D, Shorter J H, Mcmanus J B, et al. Appl. Phys. B, 2002, 75: 343. [4] Richard E C, Kelly K K, Winkler R H, et al. Appl. Phys. B, 2002, 75: 183. [5] Hanna S F, Barron-jimenez R, Anderson T N, et al. Appl. Phys. B, 2002, 75: 113. [6] Wainner R T, Green B D, Allen M G, et al. Appl. Phys. B, 2002, 75: 249. [7] Roths J, Zenker T, Parchatka U, et al. Appl. Opt. 1996, 35(36): 7075. [8] Reid J, Labrie D. Appl. Phys., 1981, 26: 203. [9] WANG Shu-tao, et al(王书涛, 等). J. Appl. Opt.(应用光学), 2004, 25(2): 44. [10] LI Yan, WANG Jun-de(李 燕, 王俊德). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2003, 23(5): 885.
