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Proceedings Paper

New spectroscopic methods for environmental measurement and monitoring
Author(s): Jeffrey I. Steinfeld; Robert W. Field; Matthew Gardner; Manjula Canagaratna; Shengfu Yang; Arturo Gonzalez-Casielles; Scott Witonsky; Pankaj Bhatia; Barclay Gibbs; Brian Wilkie; Stephen L. Coy; Alexander A. Kachanov
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Paper Abstract

The ability to detect a broad range of chemical species in the atmosphere, geosphere, and hydrosphere, over a wide range of ambient levels and conditions, is a key enabling technology both for environmental monitoring and for sensing the presence of hazardous materials such as explosives or chemical agents. In this paper we describe several recent developments in the area of high-sensitivity chemical monitoring, including Cavity RingDown Spectroscopy (CRDS) and Raman spectroscopy. Significant improvements in the sensitivity of both ultraviolet and infrared CRDS have been made in our laboratory during the past year. Infrared CRDS, employing tunable infrared optical parametric oscillators, multilayer dielectric high-reflectivity mirrors, and membrane preconcentrator technology, may have the potential for detecting vapors from concealed explosives as well as a wide variety of volatile organic compounds present at parts-per-billion levels or below. Sensitivity enhancement techniques for Raman spectroscopy, such as Surface-Enhanced Raman Spectroscopy, may achieve similar sensitivities for samples in ultra-dilute solutions. We also address the relationship of novel monitoring techniques, such as these high-sensitivity detection methods, to current and future regulatory issues.

Paper Details

Date Published: 21 December 1999
PDF: 6 pages
Proc. SPIE 3853, Environmental Monitoring and Remediation Technologies II, (21 December 1999); doi: 10.1117/12.372839
Show Author Affiliations
Jeffrey I. Steinfeld, Massachusetts Institute of Technology (United States)
Robert W. Field, Massachusetts Institute of Technology (United States)
Matthew Gardner, Massachusetts Institute of Technology (United States)
Manjula Canagaratna, Massachusetts Institute of Technology (United States)
Shengfu Yang, Massachusetts Institute of Technology (United States)
Arturo Gonzalez-Casielles, Massachusetts Institute of Technology (United States)
Scott Witonsky, Massachusetts Institute of Technology (United States)
Pankaj Bhatia, Massachusetts Institute of Technology (United States)
Barclay Gibbs, Massachusetts Institute of Technology (United States)
Brian Wilkie, Massachusetts Institute of Technology (United States)
Stephen L. Coy, Massachusetts Institute of Technology (United States)
Alexander A. Kachanov, Univ. Joseph Fourier (France)


Published in SPIE Proceedings Vol. 3853:
Environmental Monitoring and Remediation Technologies II
Tuan Vo-Dinh; Robert L. Spellicy, Editor(s)

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