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Proceedings Paper

Daytime rapid detection of minerals and organics from 50 and 100 m distances using a remote Raman system
Author(s): Anupam K. Misra; Shiv K. Sharma; Paul G. Lucey; Rachel C. F. Lentz; Chi Hong Chio
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Paper Abstract

We have developed a remote Raman system, using an 8-in telescope and a 532-nm pulse laser (20 Hz and 20 mJ/pulse), which is capable of operating in daylight. From distances of 50 and 100 m and with an integration time of just 1 second (equivalent to 20 laser pulses at 20 Hz), good quality Raman spectra with high signal-to-noise ratios were readily obtained. The Raman system was also tested using only single-laser-pulse excitation (8 ns pulse width) with an integration time of 2 μs. The spectra obtained from single-laser-pulse excitation also show clear Raman features and can be used for rapid, unambiguous identification of various chemical substances. We successfully identified a number of substances, including organic chemicals (acetone, naphthalene, nitro-methane, nitro-benzene and cyclohexane); inorganic chemicals and minerals (nitric acids, sulfuric acid, potassium perchlorate, gypsum, ammonium nitrate, epsomite, melanterite, calcite and sulfur); and amino acids. The remote Raman system has a range of applications, such as environmental monitoring (e.g., detection of hazardous chemicals and chemical spills from a safe distance in real time) or homeland security (e.g., rapid identification of chemicals on a conveyor belt or from a fast-moving object).

Paper Details

Date Published: 26 September 2007
PDF: 14 pages
Proc. SPIE 6681, Lidar Remote Sensing for Environmental Monitoring VIII, 66810C (26 September 2007); doi: 10.1117/12.739208
Show Author Affiliations
Anupam K. Misra, Univ. of Hawaii (United States)
Shiv K. Sharma, Univ. of Hawaii (United States)
Paul G. Lucey, Univ. of Hawaii (United States)
Rachel C. F. Lentz, Univ. of Hawaii (United States)
Chi Hong Chio, Univ. of Hawaii (United States)

Published in SPIE Proceedings Vol. 6681:
Lidar Remote Sensing for Environmental Monitoring VIII
Upendra N. Singh, Editor(s)

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