利用红外辐射源发出稳定的宽带辐射信号, ABB Bomem MR170 FTIR光谱仪作为接收探测系统,组建了一套近地面野外大 气红外大气透过率测量系统。通过FTIR得到的透过率与MOTRAN的计算结果进行对比,发现二者虽然具有较好的相关度,但是 在透过率较高的波段(2500~3000 cm-1, 4400~4800 cm-1)数据仍会有较大差别。结合水汽的变化情况,分 析了2400 cm-1的透 过率随时间变化情况,说明在局地环境下水汽参数变化会对模型计算的大气透过率带来影响。

The steady broad band radiation signal, from the infrared radiation source, passed through a collimator and propogated atmosphere. It was received by the ABB Bomem MR 170 FTIR spectrometer, the detection system. Based on the spectrometer, a set of surface atmospheric infrared transmittance measurement system in open air was constructed. In Hefei area, the system was used to measure actual atmospheric transmittance. Compared the measured results with MODTRAN outputs, the correlation coefficients are bigger than 0.9, but there are great differences at regions from 2500 cm-1 to 3000 cm-1 and from 4400 cm-1 to 4800 cm-1. By analyzing the changes of water vapor concentration and the transmittance of 2400 cm-1 along with time, the results indicate that the changes of water vapor parameter of local area environment take effect on the transmittance of atmospheric model.