长光程差分吸收光谱法测量大气SO_2浓度研究  

Study on the measurement of Air SO_2 based on Long path differential optical absorption spectroscopy

作　　者：侯艳霞[1,2] 魏永杰[3] 刘迎春 李红莲[1] 陈文亮[1,2] 徐可欣[1] 邹德宝[1] 

机构地区：[1]天津大学精密测试技术与仪器国家重点实验室,天津300072 [2]天津大学微光机电系统技术教育部重点实验室,天津300072 [3]河北工业大学机械工程学院,天津300401 [4]天津市滨海新区大港环境保护监测站,天津300270

出　　处：《激光杂志》2013年第1期37-38,共2页Laser Journal

摘　　要：差分吸收光谱技术测量空气中痕量气体浓度时,结果准确性受标准差分吸收截面和仪器函数影响。为此,提出采用多种浓度样气计算差分吸收截面的方法,将测得的差分吸收截面应用于实验室SO2样气的测量,得到SO2气体浓度相对误差为1.67%;现场测量大气中SO2气体浓度最大值为66.73ppb,最小值为12.49ppb,日平均浓度为28.2ppb,符合当地实际。实验表明,该方法能够准确测量大气中SO2气体浓度。Different Optical Absorption Spectrometry is a widely used method to determine concentrations of atmospheric species. The accuracy of computational solution depends on the absorption cross - section and instrument function. The paper has put forward getting standard cross - section method using a variety of density cell spectra. The method is used to measure the concentration of S02 in laboratory condition and the errors of concentration inversion results are no more than 1.67%. Through field experiment, the atmospheric SO2 changed from 66.73ppb to 12.49ppb with the mean value 28.2ppb. The experiments indicate, this method can satisfy the need for online gas monitoring.

关 键 词：差分吸收光谱 吸收截面 最小二乘算法 

分 类 号：X515[环境科学与工程—环境工程]