物理学报Issue(5)：1-5,5.DOI:10.7498/aps.64.053301
基于波长调制光谱技术的线宽测量理论及其应用研究∗
Theoretical and applied researches on measuring line width in wavelength mo dulation sp ectroscopy
摘要
Abstract
Line width is the key parameter in tunable diode laser absorption spectroscopy (TDLAS);the dominant line widths are Doppler and collisional broadenings. Under low absorbance, the ratios of 2nd to 4th harmonics at the line center monotonously decrease and intersect at a fixed point, regardless of the changes in Doppler and collisional line widths. Based on this characteristic, a method is proposed which employs the ratios to measure the line width. To validate the reliability and accuracy of the proposed method, the transition of CO2 at 6982.0678 cm−1 is selected to measure the line width, the gas partial and total pressure. Experimental results show that the proposed method can achieve high precision in actual measurements.关键词
可调谐二极管激光吸收光谱(TDLAS)/波长调制光谱(WMS)/线宽/气体分压Key words
tunable diode laser absorption spectroscopy (TDLAS)/wavelength modulation spectroscopy (WMS)/line width/partial pressure引用本文复制引用
张书锋,蓝丽娟,丁艳军,贾军伟,彭志敏..基于波长调制光谱技术的线宽测量理论及其应用研究∗[J].物理学报,2015,(5):1-5,5.基金项目
国家自然科学基金(批准号:51206086,51176085)资助的课题.@@@@* Project supported by the National Natural Science Foundation of China (Grant Nos.51206086,51176085) （批准号:51206086,51176085）
