物理学报2011，Vol.60Issue(7)：158-164,7.
非标定波长调制吸收光谱气体测量研究
Calibration-free wavelength modulation absorption spectrum of gas
摘要
Abstract
The calibration- free wavelength modulation absorption spectrum is studied based on the second harmonic （2f） signal to remove the calibration procedure for tunable diode laser absorption gas sensing. The simulated 2f signal is obtain from the analysis of peak and trough from measured 2f signal line shape. The gas concentration is calculated by the linear fitting of measured and simulated 2f signals. The experiment on CO2 detection is carried out at transition of 6336.24cm in a 10 cm absorption cell. The results prove that the calibration - free wavelength modulation absorption spectrum is suited for on-site gas sensing at various conditions. The average absolute error of gas concentration is 0.67% at modulation index ranging from 1.8 to 3.2. With gas concentration and pressure varied, the average absolute errors of gas concentration are measured to be about 0.98% and O. 74%.关键词
波长调制/二次谐波/吸收光谱/半导体激光器Key words
wavelength modulation/second harmonic signal/absorption spectroscopy/diode laser分类
信息技术与安全科学引用本文复制引用
李宁,翁春生..非标定波长调制吸收光谱气体测量研究[J].物理学报,2011,60(7):158-164,7.基金项目
国家自然科学青年科学基金（批准号：11002074）,高等学校博士学科点专项科研基金（批准号：20093219110037）,中国博上后科学基金（批准号：20100481147）,江苏省博士后科研资助计划（批准号：0902094C）和南京理工大学自主科研专项计划（批准号：2010ZYTS092）资助的课题 （）
