Pulsed remote Raman system for daytime measurements of mineral spectra

A remote Raman system has been developed utilizing a 532 nm pulsed laser and gated intensified charged couple device (ICCD) detector in the oblique geometry. When the system is set for 50 m sample distance it is capable of measuring Raman spectra of minerals located at distances in the range of 10–6...

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Bibliographic Details
Published in:Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Molecular and biomolecular spectroscopy, 2005-08, Vol.61 (10), p.2281-2287
Main Authors: Misra, Anupam K., Sharma, Shiv K., Chio, Chi Hong, Lucey, Paul G., Lienert, Barry
Format: Article
Language:English
Subjects:
Benzene
Benzene - chemistry
Calcium Carbonate - chemistry
Daytime Raman
Minerals
Minerals - chemistry
Naphthalenes - chemistry
Remote fluorescence
Remote Raman
Silicates
Silicates - chemistry
Spectrum Analysis, Raman - instrumentation
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Summary:A remote Raman system has been developed utilizing a 532 nm pulsed laser and gated intensified charged couple device (ICCD) detector in the oblique geometry. When the system is set for 50 m sample distance it is capable of measuring Raman spectra of minerals located at distances in the range of 10–65 m from the telescope. Both daytime and nighttime operations are feasible and the spectra of minerals can be measured in a short period of time, of the order of a few seconds. In oblique geometry, measured sampling depth is more than 30 m, during which the system maintains very high performance without any adjustments. Much longer sampling depth (0.1–120 m) has been observed when the system is configured in the coaxial geometry. Clear advantages of using a gated detection mode over the continuous (CW) mode of operation in reducing the background signal and eliminating long-lived fluorescence signals from the Raman spectra are presented. The performance of the pulsed Raman system is demonstrated by measuring spectra of Raman standards including benzene (C 6H 6) and naphthalene (C 10H 8), a low Raman cross section silicate mineral muscovite (KAl 2(Si 3Al)O 10(OH) 2), and a medium Raman cross section mineral calcite (CaCO 3).
ISSN:1386-1425
DOI:10.1016/j.saa.2005.02.027