MRI: Development of a LASER Sensor for the Measurement of Elemental and Reactive Gaseous Mercury

MRI：开发用于测量元素汞和活性气态汞的激光传感器

• 批准号: 0821174
• 负责人: Anthony Hynes
• 金额: $ 64.61万
• 依托单位: University of Miami
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-08-15 至 2012-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0821174&HistoricalAwards=false
• 关键词: MRI; Development; LASER; Sensor; Measurement; MRI; Development; LASER; Sensor; Measurement

The Principal Investigators (PIs) will develop a novel laser based sensor for the detection of gas phase elemental mercury, Hg(0),and reactive gaseous mercury (RGM). The instrument will be based on a single 50 Hz, Nd-Yag laser that will be used to pump two compact dye lasers. Preliminary efforts by the PIs have shown this technology to be feasible. Upon completion, the instrument will be capable of measuring gaseous elemental mercury with a temporal resolution and precision that will allow for Hg(0) flux measurements to be made using the eddy correlation technique. The instrument, when configured for in-situ sampling for measurement of Hg(0) will achieve detection limits which match those of current instrumentation but in a significantly shorter time period. This improvement in temporal resolution and the detection approach offer significant advantages over current approaches for measurement of Hg(0) on aircraft platforms. The same instrument can be reconfigured to operate with presampling on denuders for the sampling of RGM. It will be possible to significantly reduce sampling time compared with current approaches and offer the possibility of temporal resolution necessary to obtain well resolved diurnal profiles of RGM. It also shows promise for the speciation of RGM using programmable thermal decomposition/desorption from denuders. This instrumentation will be used primarily for research and research training but it will be integrated into educational activities and it will improve exposure to, and increase access and use of, state-of-the-art laser systems by scientists, graduate and undergraduate students at the University of Miami. The ability to accurately measure the chemical speciation and deposition rates of elemental and reactive gaseous mercury has major implications for regulatory policy and the implementation of the U.S. Clean Air Mercury Rule.

主要研究人员（PIS）将开发一种基于激光的新型传感器，用于检测气相元素汞，Hg（0）和反应气态汞（RGM）。该仪器将基于单个50 Hz，ND-YAG激光器，该激光将用于泵送两个紧凑的染料激光器。 PI的初步努力表明这项技术是可行的。 完成后，该仪器将能够用时间分辨率和精度测量气态元素汞，从而可以使用涡流相关技术进行Hg（0）通量测量。 该仪器配置用于原位采样时，用于测量Hg（0）的仪器将达到与当前仪器相匹配但时间较短的检测极限。 时间分辨率和检测方法的这种改进比当前测量飞机平台上HG（0）的方法具有显着优势。 可以将同一仪器重新配置以用裸体器的预采样进行采样，以进行RGM的采样。 与当前方法相比，可以显着减少采样时间，并为获得RGM的昼夜概况提供必要的时间分辨率。 它还使用可编程的热分分解/解吸依剂的人对RGM的形态有望。该仪器将主要用于研究和研究培训，但它将纳入教育活动中，并通过科学家，研究生和本科生在迈阿密大学改善最先进的激光系统的访问和使用。 准确衡量元素和反应气态汞的化学物种形成和沉积速率的能力对监管政策以及美国清洁汞规则的实施具有重大影响。