温度压强对CO_2吸收光谱的影响

为了提高差分吸收CO2探测激光雷达的反演精度,本文采用可调谐半导体激光吸收光谱技术,利用双光路差分实验系统,在不同温度和压强下精确探测了CO2吸收谱线(1.572μm附近)的精细结构,分析了吸收光谱谱型的变化差异,获得了5个温度(287K,297K,311K,315K,324K)的压力增宽系数和吸收截面,推算出了CO2的温度相关指数.这些参数是对现有数据库的补充和完善,确保差分吸收CO2探测激光雷达的精确反演,从而提高其探测能力.

Influence of temp erature and pressure on absorption sp ectrum of around 1.6 μm for differential absorption lidar

In order to improve the inversion precision of CO₂ lidar, the fine structure in CO₂ absorption spectrum (at around 1.572 μm) has been detected accurately, with tunable diode laser absorption spectroscopy (TDLAS) technique in a double beam differential system. Differences between absorption spectra were analyzed. The five kinds of pressure-broadened coefficients and absorption cross sections are obtained respectively at 287, 297, 311, 315 and 324 K. The temperature-dependent exponents of CO₂ are also calculated, these parameters would be a series of corrections and supplements for the existing database. These results may help improve the detection capability of CO₂ lidar.
Keywords： atmospheric optics 2')" href="#">absorption spectrum of CO₂ lidar the differential system of double optical path