Laser Absorptometer for Detection of Trace Species

用于检测痕量物质的激光吸收计

• 批准号: 9301915
• 负责人: Allen Flusberg
• 金额: $ 30万
• 依托单位: Science Research Laboratory Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-09-15 至 1996-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9301915&HistoricalAwards=false
• 关键词: Laser; Absorptometer; Detection; Trace; Species

9301915 Flusberg With the increase in atmospheric pollution and a new, growing public awareness of resulting environmental damage, there is a need for new technology to measure the concentration of trace species in the atmosphere. Extractive methods, in which a sealed sample of air is analyzed in a laboratory, are expensive and are inapplicable to continuous, in situ monitoring of concentrations. Science Research Laboratory (SRL) will develop an instrument called a laser interferometric absorptiometer (LIA) to fill this need. The basis of this instrument is the interferometric measurement of the optical-path change that occurs immediately after a pulsed laser beam is absorbed by trace species present in one arm of the interferometer. This novel approach will lead to a breakthrough in the technology of monitoring trace gases. It will allow rapid in situ measurements of trace-gas concentrations to be made for the first time at parts-per-trillion (ppt) levels, 100-1000 times more sensitively than instruments based on other approaches to monitor trace species in the field. In Phase I the characteristics of a LIA were determined, and an LIA suitable for ppt trace-gas measurements was designed. IN Phase II, SRL will experimentally research and demonstrate rapid ppt detection of several trace gases including chlorofluorocarbons (CFCs), major pollutants that are responsible for depletion of the ozone layer and are considered significant contributors to global warming. In a privately funded Phase III follow-on program, SRL will develop a commercial instrument capable of measuring industrial emissions of CFCs and other pollutants.

小行星9301915 随着大气污染的增加和公众对由此造成的环境损害的新的、日益增长的认识，需要新的技术来测量大气中痕量物质的浓度。 在实验室中分析密封空气样品的提取方法是昂贵的，并且不适用于浓度的连续原位监测。 科学研究实验室（SRL）将开发一种称为激光干涉吸收仪（LIA）的仪器来满足这一需求。 该仪器的基础是在脉冲激光束被干涉仪的一个臂中存在的痕量物质吸收后立即发生的光路变化的干涉测量。 这种新方法将导致痕量气体监测技术的突破。 它将允许首次以万亿分之一（ppt）的水平对痕量气体浓度进行快速原位测量，比基于其他方法的仪器灵敏100-1000倍，以监测现场痕量物质。 在第一阶段中，确定了LIA的特性，并设计了适合于PPT痕量气体测量的LIA。 在第二阶段，SRL将进行实验研究，并演示几种痕量气体的快速ppt检测，包括氯氟烃（CFCs），这是导致臭氧层消耗的主要污染物，被认为是全球变暖的重要因素。 在私人资助的第三阶段后续计划中，SRL将开发一种能够测量CFC和其他污染物工业排放的商业仪器。