中文摘要：

针对氙弧灯作为主动差分吸收谱（DOAS）宽带热光源带来严重的能源浪费和一些不必要的干扰，提出采用新型冷光源发光二极管（LEDs）作为光学遥感DOAS系统的：光源。研究了LEDs—DOAS系统的标定及反演方法，首先介绍了LEDs—DOAS光学遥感系统的结构，分析了其获取痕量气体大气浓度的原理；然后通过把具有线状吸收谱特性的汞灯光引入到LEDs—DOAS仪器，得到仪器函数，对系统进行标定；再把标准库待测气体的吸收截面和仪器函数卷积，得到该痕量气体的在LEDs—DOAS仪器吸收强度，并基于最小二乘原理反演痕量气体的大气浓度；最后利用NO2样品标定LEDs—DOAS系统的测量精度，实验结果表明，测量误差小于5％。

英文摘要：

In order to avoid the serious energy wastage and unnecessary interference using xenon arc lamps as the broadband hot light source in active differential optical absorption spectroscope （DOAS） systems ,the light emitting diode （LED） is developed as a new type of cold light source for optical remote sensing DOAS systems in this paper. A study on calibrating and inversing method of light emitting diodes differential optical absorption spectroscopy （LEDs-DOAS） system is introduced. Firstly, the structure of LEDs-DOAS system is described,and the inversing principle of atmospheric trace gases concentrations is analyzed based on the differential absorption of trace gases. The line-shaped absorption spectrum of Hg lamp is introduced into LEDs-DOAS instrument to get the instrument function. The standard absorption section of trace gas is convoluted with the instrument function. Then the absorption strength of the trace gas is gained by the LEDs-DOAS system. Concentrations of trace gases are retrieved based on the leastsquares fitting method. At last,the NO2 cells are also used to test the accuracy of the LEDs-DOAS systern. Experimental results show that the measuring relative error is less than 5 %, which demonstrates that the light-emitting diode as a light source of LEDs-DOAS system is feasible and reliable to measure the atmospheric trace gases.