Atmospheric Trace Gas Flux Meter Using Tunable Diode Lasers

使用可调谐二极管激光器的大气痕量气体通量计

• 批准号: 8907681
• 负责人: Mark Zahniser
• 金额: $ 22.44万
• 依托单位: Aerodyne Research Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-09-15 至 1992-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8907681&HistoricalAwards=false
• 关键词: Atmospheric; Trace; Gas; Flux; Meter

The chemical composition of the troposphere is determined by the sources and sinks of biogenic and anthropogenic trace gases and the intervening photochemical transformations and mass transport processes linking them. The recent recognition that a thorough understanding of these processes in the natural atmosphere is necessary before the effects of man-made perturbations may be assessed has prompted a concerted effort to study the natural troposphere. The insight gained from this research will allow more accurate predictions of the impact of man's activities on the environment. The objective of this Phase II SBIR research project is the development of instrumentation to measure fluxes of atmospheric trace gases to or from the earth's surface. The method to be investigated is based on the well established eddy correlation technique and would use a tunable diode laser light source combined with a multiple pass absorption cell to detect trace species at sub-part-per-billion levels. The instrument would be designed specifically to be interfaced with a sonic anemometer to provide fast time response and minimal flowfield interference as required for the eddy correlation method. In the Phase II study, final design, development, testing, and field demonstration of the instrument will be conducted. The final instrument will be applicable to flux measurements of trace gases including sulfur dioxide, nitric oxide, nitrogen dioxide, nitric acid, ozone, and hydrogen peroxide.

对流层的化学成分被确定 生物源和人为痕迹的源和汇 气体和介入的光化学转化， 将它们连接起来的物质运输过程。 最近承认 对自然界中这些过程的透彻理解 在人为影响之前， 扰动可能会被评估，促使协调一致的努力， 来研究自然对流层。 从中得到的启示是 研究将使人们能够更准确地预测 人类活动对环境的影响。 第二阶段SBIR研究项目的目标是 发展仪器来测量 大气中的痕量气体 的 一种研究方法是建立在涡流基础上的 相关技术，并将使用可调谐二极管激光 源与多程吸收池结合进行检测 十亿分之几的微量物种 仪器 将被专门设计成与声波接口 提供快速响应和最小流场的风速计 涡流相关法所需的干扰。 在 II期研究、最终设计、开发、测试和 并会进行实地示范。 的 最终文书将是 适用于含硫微量气体的流量测量 氧化物、一氧化氮、二氧化氮、硝酸、臭氧，以及 过氧化氢