Duan Jun, Qin Min, Fang Wu, Hu Ren-zhi, Lu Xue, Shen Lan-lan, Wang Dan, Xie Pin-hua, Liu Jian-guo, Liu Wen-qing
Guang Pu Xue Yu Guang Pu Fen Xi. 2016 Feb;36(2):466-70.
As a highly sensitive detection technology, incoherent broadband cavity enhanced absorption spectroscopy (IBBCEAS) have successfully measured a variety of trace gases. According to the principle of cavity enhanced absorption spectroscopy, if the accurate concentration of the target gas, the curve of the mirror reflectance, effective absorption path length, the light intensity of the absorbing gas and non-absorbing gas are known, the absorption cross section of the absorption gas can be measured. The accurate measurements of absorption cross section are necessary for satellite retrievals of atmospheric trace gases and the atmospheric research. This paper describes an incoherent broadband cavity enhanced absorption spectroscopy(IBBCEAS) instrument with 365 nm LED as the light source for measuring absorption cross section of SO₂ from 357 to 385 nm which is arising from the spin-forbidden a ³B₁--X¹A₁ transition. In comparison to the literature absorption cross section of SO₂, and correlation coefficient r is 0.997 3. The result shows the potential of the IBBCEAS system for measuring weak absorption cross section.
作为一种高灵敏度检测技术，非相干宽带腔增强吸收光谱法（IBBCEAS）已成功测量了多种痕量气体。根据腔增强吸收光谱原理，如果已知目标气体的准确浓度、镜面反射率曲线、有效吸收路径长度、吸收气体和非吸收气体的光强，就可以测量吸收气体的吸收截面。准确测量吸收截面对于卫星反演大气痕量气体和大气研究至关重要。本文介绍了一种以365 nm发光二极管作为光源的非相干宽带腔增强吸收光谱仪（IBBCEAS），用于测量由自旋禁戒的a³B₁--X¹A₁跃迁产生的357至385 nm波长范围内SO₂的吸收截面。与文献中SO₂的吸收截面相比，相关系数r为0.997 3。结果表明了IBBCEAS系统在测量弱吸收截面方面的潜力。
