Second-harmonic detection research with tuneable diode laser absorption spectroscopy

作者：Wang Min; Zhang Yu Jun; Liu Wen Qing; Liu Jian Guo; Wang Tie Dong; Tu Xing Hua; Gao Shan Hu; Kan Rui Feng

来源：Optical Technique, 2005, 31(2): 279-281+285.

Tunable diode laser absorption spectroscopy (TDLAS) is a new trace gas detection technique provided with high sensitivity, high selectivity and high precision. It makes use of a tunable diode laser scanning in wavelength and tuning in current. Theory analysis and experiment results indicate that the second-harmonic signal characteristic relates to the absorption characteristic of measured gas and the parameter of wave scan and current modulation. The second-harmonic curve under different wave scan parameter and power modulation parameter is studied, their wave characteristic and stability are analyzed, in order to find out the optimize detection parameters of wave scan and power modulation, the best second-harmonic curve is gotten.

• 出版日期2005