Pulsed Absorption Diffractometer for Detecting Trace Species

用于检测痕量物质的脉冲吸收衍射仪

• 批准号: 9261091
• 负责人: Allen Flusberg
• 金额: $ 4.99万
• 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: 1993-01-01 至 1994-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9261091&HistoricalAwards=false
• 关键词: Pulsed; Absorption; Diffractometer; Detecting; Trace

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 proposes the development of an instrument called a Pulsed Absorption Diffractometer (PAD) to fill this need. The basis of this instrument is the detection of a transient, volumetric diffraction grating that is formed after a pulsed laser beam is absorbed by trace species present in the illuminated region. The PAD will be sensitive to parts-per-trillion trace-gas concentrations, 2-3 orders of magnitude better than instruments based on other approaches to monitor trace species in the field.

随着大气污染的加剧和一种新的、不断增长的 公众意识造成的环境破坏，有必要 新技术，以测量浓度的痕量物种， 大气层 提取方法，其中密封的 在实验室中分析空气，昂贵且不适用 到连续的现场浓度监测。 科学 研究实验室建议开发一种仪器 称为脉冲吸收衍射仪（PAD），以满足这一需求。 该仪器的基础是检测瞬态， 在脉冲激光之后形成的体积衍射光栅 光束被存在于被照射的光中的痕量物质吸收， 地区 PAD将对万亿分之几的痕量气体敏感 浓度，比仪器高2-3个数量级 根据其他方法监测现场的痕量物种。