Instrumental and Atmospheric Considerations in the Development and Application of an Airborne/Spaceborne Water Vapor DIAL System

E. Browell, S. Ismail
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Abstract

The Differential Absorption Lidar (DIAL) technique can be used to measure concentration profiles of many atmospheric gases1. Atmospheric water vapor (H2O) has been measured with the DIAL technique from ground-based2-4 and airborne systems5. In the DIAL technique, two laser wavelengths are transmitted near simultaneously, one "on" the peak of the H2O absorption line and another away from, or "off" the peak. In the range resolved DIAL measurement, H2O concentration between two ranges is calculated using the well known DIAL equation1, which is a function of the on and off signals at the two ranges and the effective H2O differential, absorption cross section. Random errors due to noise in the detected signal and systematic errors due to uncertainties in the knowledge of the effective cross section, Δσ, contribute to inaccuracy in the DIAL measurements. The development of a DIAL system must give full consideration to these two sources of error and any known systematic offsets can be at least partially compensated for in the DIAL data analysis phase. A brief discussion of these effects is given in this paper, and a more detailed description of these effects is given in Ismail and Browell6.
机载/星载水汽刻度盘系统开发和应用中的仪器和大气考虑
差分吸收激光雷达(DIAL)技术可用于测量许多大气气体的浓度分布。利用DIAL技术从地面2-4和机载系统5测量了大气水蒸气(H2O)。在DIAL技术中,两个激光波长几乎同时传输,一个“在”H2O吸收线的峰值上,另一个远离或“关闭”峰值。在范围分辨DIAL测量中,使用众所周知的DIAL方程1计算两个量程之间的H2O浓度,该方程是两个量程上的开、关信号和有效H2O微分吸收截面的函数。由于检测信号中的噪声引起的随机误差和由于有效截面知识的不确定性(Δσ)引起的系统误差导致DIAL测量的不准确性。DIAL系统的开发必须充分考虑到这两个误差来源,任何已知的系统偏移至少可以在DIAL数据分析阶段得到部分补偿。本文对这些效应作了简要的讨论,Ismail和browell对这些效应作了更详细的描述。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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