光谱学与光谱分析, 2017, 37 (1): 27, 网络出版: 2017-02-09
光声光谱与TDLAS技术在不同气压下的特性研究
Study on Pressure Characteristics of Photoacoustic Spectroscopy and TDLAS
摘要
基于PAS与TDLAS的基本原理, 讨论了两者之间的联系, 推导了光声信号和TDLAS信号与气压的关系式, 设计并构造了一个可以同时进行PAS与TDLAS气体测量的对比装置, 并对两者在不同气压条件下的测量结果进行了分析和研究, 为不同气压条件下的气体测量技术选择提供了参考。 试验研究表明: 随着气压上升, 光声光谱与TDLAS信号均变大, 极限检测灵敏度均提高; 随着气压上升, 气体吸收能量转化为光声信号的效率变低; 在低压时, 使用光声光谱进行气体检测具有更好的效果。
Abstract
Based on priciples of PAS and TDLAS, relevance between them was dicussed, while the relationships of PAS and TDLAS signal with pressure were derived. A contrast device for making PAS and TDLAS gas detection simultaneously was designed and constructed to test different pressure and provide a reference for the gas measurement technology selection under different pressure conditions. Experimental studies show that: as the pressure rises, PAS and TDLAS signals become larger, and limit detection sensitivity are improved; with the rising pressure, conversion efficiency from energy absorbed by gas to PAS signals becomes low; at low pressure condiction, PAS is a better choice.
陈奕钪, 鞠昱, 韩立. 光声光谱与TDLAS技术在不同气压下的特性研究[J]. 光谱学与光谱分析, 2017, 37(1): 27. CHEN Yi-kang, JU Yu, HAN Li. Study on Pressure Characteristics of Photoacoustic Spectroscopy and TDLAS[J]. Spectroscopy and Spectral Analysis, 2017, 37(1): 27.