Two-pulse rapid remote surface contamination measurement.

Headrick, Jeffrey M. ; Kulp, Thomas J. ; Bisson, Scott E. ; Reichardt, Thomas A. ; Farrow, Roger L.

关键词: ALUMINIUM;    CHEMICAL WARFARE AGENTS;    CONCRETES;    DETECTION;    FLUORESCENCE;    RAMAN SPECTROSCOPY;    SENSITIVITY;    SENSORS;    SURFAC;   

DOI  :  10.2172/1011661
RP-ID  :  SAND2010-7978
PID  :  OSTI ID: 1011661
Others  :  TRN: US201109%%722

美国|英语

来源: SciTech Connect

【 摘 要 】

This project demonstrated the feasibility of a 'pump-probe' optical detection method for standoff sensing of chemicals on surfaces. Such a measurement uses two optical pulses - one to remove the analyte (or a fragment of it) from the surface and the second to sense the removed material. As a particular example, this project targeted photofragmentation laser-induced fluorescence (PF-LIF) to detect of surface deposits of low-volatility chemical warfare agents (LVAs). Feasibility was demonstrated for four agent surrogates on eight realistic surfaces. Its sensitivity was established for measurements on concrete and aluminum. Extrapolations were made to demonstrate relevance to the needs of outside users. Several aspects of the surface PF-LIF physical mechanism were investigated and compared to that of vapor-phase measurements. The use of PF-LIF as a rapid screening tool to 'cue' more specific sensors was recommended. Its sensitivity was compared to that of Raman spectroscopy, which is both a potential 'confirmer' of PF-LIF 'hits' and is also a competing screening technology.