Improved Different Absorption LIDAR System for Measurement of Atmospheric Water Vapor and Temperature

改进的不同吸收激光雷达系统用于测量大气水蒸气和温度

• 批准号: 9461435
• 负责人: David Hovde
• 金额: $ 7.5万
• 依托单位: Southwest Sciences Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-02-01 至 1996-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9461435&HistoricalAwards=false
• 关键词: Improved; Different; Absorption; LIDAR; System

This Small Business Innovation Research Phase I project will address the feasibility of a turn-key Differential Absorption LIDAR (DIAL) system for the measurement of atmospheric water vapor and temperature profiles. Advanced atmospheric models require spatially resolved measurements of humidity and temperature at high altitude where existing measurement techniques are inaccurate. To address these needs, the proposed system combines commercially available laser sources to generate well controlled, narrow line width pulses that will allow remote measurement of water vapor concentration with a sensitivity of 0.5 mg/kg and temperatures to within 2 K. The system will be constructed from laser sources that are well developed and have already been engineered for high reliability. Wavelength control will be provided by a single-mode diode laser amplified to suitable pulse energies. Characterizing the amplified diode laser pulses will be the key research objective in Phase I. Use of a pulse-amplified cw laser will result in improved frequency control that is essential for accurate measurement at the tropopause and lower stratosphere. Furthermore, by taking advantage of both the tunability and narrow line width of a single-mode diode laser, water absorption line ratios can be measured from which remote temperatures can be determined. The system will be compact, robust, have high wall-plug efficiency, and will operate safely in a look-down geometry.

这个小企业创新研究第一阶段项目将解决交钥匙差分吸收激光雷达（DIAL）系统测量大气水蒸气和温度分布的可行性。先进的大气模型需要在现有测量技术不准确的高空进行空间分辨的湿度和温度测量。为了满足这些需求，所提出的系统结合了商业上可用的激光源，以产生良好控制的窄线宽脉冲，这将允许远程测量水蒸气浓度，灵敏度为0.5 mg/kg，温度在2 K以内。该系统将由开发良好的激光源构成，并已设计为高可靠性。波长控制将由放大到适当脉冲能量的单模二极管激光器提供。第一阶段的主要研究目标是对放大后的半导体激光脉冲进行表征。使用脉冲放大的连续波激光器将改善频率控制，这对于对流层顶和平流层下部的精确测量是必不可少的。此外，通过利用单模二极管激光器的可调谐性和窄线宽，可以测量水吸收线比率，由此可以确定远程温度。该系统将是紧凑的，坚固的，具有高的壁插效率，并将在俯视几何结构中安全地操作。