Remote Raman Spectroscopic Detection of Inorganic, Organic and Biological Materials to 100 m and More

Details Remote Raman Spectroscopic Detection of Inorganic, Organic and Biological Materials to 100 m and More Remote Raman Spectroscopic Detection of Inorganic, Organic and Biological Materials to 100 m and More

Nov 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1075....3s&link_type=abstract

PERSPECTIVES IN VIBRATIONAL SPECTROSCOPY: Proceedings of the 2nd International Conference on Perspectives in Vibrational Spectro

Mathematics

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Analytical Methods Involving Vibrational Spectroscopy, Magnetic And Electrical Properties, Organic Compounds, Polymers

Scientific paper

We have designed and tested a portable gated-Raman system that is capable of detecting organic and inorganic bulk chemicals over stand-off distances of 100 m and more during day and night time. Utilizing a 532 nm laser pulse (~35 mJ/pulse), Raman spectra of several organic and inorganic compounds have been measured with the portable Raman instrument over a distance of 100 m. Remote Raman spectra, obtained with a very short gate (2 micro second), from a variety of inorganic minerals such as calcite (CaCO3), α-quartz (α-SiO2), barite (BaSO4), and FeSO4.7H2O, and organic compounds such as acetone, methanol, 2-propanol and naphthalene showed all major bands required for unambiguous chemical identification. We also measured the Raman and fluorescence spectra of plant leaves, tomato, and chicken eggshell excited with a 532 nm, 20 Hz pulsed laser and accumulated over 200 laser shots (10-s integration time) at 110 m with good signal-to-noise ratio. The results of these investigations show that remote Raman spectroscopy over a distance of 100 m can be used to identify Raman fingerprints of both inorganic, organic, and some biological compounds on planetary surfaces and could be useful for environmental monitoring.

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