3.4 μm处NO<sub>2</sub>吸收光谱特性及在差分吸收激光雷达中的应用

为使中红外差分吸收激光雷达能够精确测量NO2气体浓度, 对NO2在中红外波段的吸收光谱特性进行测量分析.采用光参量放大激光器的λon和光参量振荡激光器λoff两路激光分别进行吸收谱线测量实验.用谱线宽小于0.05 nm的λon激光测量了NO2气体在3 410~3 433 nm的吸收光谱, 计算得到其吸收截面, 采集分析了NO2在291 K、308 K、363 K三个温度下的光谱特性, 用谱线宽约为10 nm的λoff激光采集了3 400~3 435 nm的吸收谱线.测量结果表明, 在3 410~3 433 nm波段, 温度和吸收截面值呈负相关, 测量的谱线与HITRAN数据库相关系数达到0.92以上; 针对λoff激光下的吸收谱线, 采用了改进的卷积修正方法, 测量结果和拟合结果相关系数为0.97.将实测的on和off波长处的吸收截面应用于使用该波长对的中红外差分吸收激光雷达仿真上, 拟合差分吸收激光雷达系统浓度测量误差, 验证了基于该波长对的差分吸收激光雷达方案的可行性.

Abstract

In order to accurately measure the concentration of NO2 gas by mid-infrared differential absorption lidar, the absorption spectrum characteristics of NO2 in mid-infrared band were measured and analyzed. The absorption cell experiments were conducted using two wavelengths λon and λoff emitted from OPA lasers and OPO lasers respectively. The absorption cross section of NO2 gas in the range of 3 410~3 433 nm is measured by a laser λon whose spectral line-width is less than 0.05 nm. The absorption cross sections at 291 K, 308 K and 363 K were acquired respectively. And the absorption spectra from 3 400~3 435 nm were also acquired by a laser λoff with spectral line-width being 10 nm. The experimental results show that the absorption cross-section is negatively correlated with temperature in the range of 3 410~3 433 nm, consisted with HITRAN database and the correlation coefficient between the measured data and the HITRAN data is above 0.92. A new convolution correction method is used to calculate the absorption spectrum line under laser λoff. The correlation coefficient between the measured results and the fitting results is 0.97. The measured absorption cross sections at the on and off wavelengths are applied to the simulation of the mid-infrared differential absorption lidar, the concentration error of differential absorption lidar is simulated, which verified the feasibility of the scheme of differential absorption lidar.

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蔡镐泽, 卜令兵, 龚宇, 杨彬, 周军. 3.4 μm处NO₂吸收光谱特性及在差分吸收激光雷达中的应用[J]. 光子学报, 2019, 48(7): 0701001. CAI Hao-ze, BU Ling-bing, GONG Yu, YANG Bin, ZHOU Jun. Absorption Spectrum Characteristics of NO₂ near 3.4 μm and Its Application in Differential Absorption Lidar[J]. ACTA PHOTONICA SINICA, 2019, 48(7): 0701001.

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