Very High Sensitivity Spectrometer for Atmospheric Measurements

用于大气测量的极高灵敏度光谱仪

• 批准号: 8722150
• 负责人: Alan Stanton
• 金额: $ 17.85万
• 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: 1988
• 资助国家: 美国
• 起止时间: 1988-09-01 至 1991-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8722150&HistoricalAwards=false
• 关键词: Very; Sensitivity; Spectrometer; Atmospheric; Measurements

The accurate measurement of concentrations or fluxes of trace gases in the atmosphere is crucial to many areas of atmospheric research. Instrumentation based on tunable diode laser absorption spectroscopy has wide generality for detection of many atmospheric species. To date, however, such systems have usually been bulky and awkward to operate and do not have adequate sensitivity for the measurement of a number of important species in the atmosphere at low concentrations. The goal of this program is to develop a rapid response, high sensitivity sensor using single-mode liquid nitrogen- cooled lead-salt diode lasers. In Phase I of this program, techniques that substantially reduce the problem of optical fringes in multiple pass absorption cells were developed. These fringes are often the limiting factor for achieving high sensitivity. The major objectives of the Phase II research are to improve further the sensitivity for infrared diode laser absorption and the study methods for simplifying instrument design using infrared fiber optics. A prototype spectrometer will be assembled for local field measurements of ambient hydrogen peroxide concentrations in order to demonstrate ultrasensitve, real-time detection of trace atmospheric species. Results of the Phase II study will provide the required design information for Phase III commercial development of instrumentation for atmospheric research.

准确测量的浓度或流量的 大气中的痕量气体对许多领域至关重要， 大气研究。 基于可调谐二极管的仪表 激光吸收光谱检测具有广泛的通用性 许多大气物种。 然而，迄今为止， 通常体积庞大，操作不便， 足够的灵敏度来测量一些 低浓度时大气中的重要物种。 该计划的目标是建立快速反应机制， 使用单模液氮的高灵敏度传感器- 冷却铅盐二极管激光器。 在该计划的第一阶段， 技术，大大减少了光学的问题， 产生了多程吸收池中的条纹。 这些条纹通常是实现高性能的限制因素。 灵敏度 第二阶段研究的主要目标是 为了进一步提高红外二极管激光器的灵敏度 吸收与仪器简化的研究方法 设计使用红外光纤。 光谱仪原型 将被组装用于环境的局部现场测量 过氧化氢浓度，以证明 超灵敏大气痕量实时探测 物种 II期研究的结果将提供 第三阶段商业所需的设计信息 开发大气研究仪器。