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Ultraviolet Stand-off Raman Measurements Using a Gated Spatial Heterodyne Raman Spectrometer.

Authors
  • Lamsal, Nirmal1
  • Sharma, Shiv K2
  • Acosta, Tayro E2
  • Angel, S Michael3
  • 1 Department of Chemistry and Biochemistry, The University of South Carolina, Columbia, South Carolina, USA.
  • 2 Hawaii Institute of Geophysics & Planetology, University of Hawaii, Honolulu, Hawaii, USA.
  • 3 Department of Chemistry and Biochemistry, The University of South Carolina, Columbia, South Carolina, USA [email protected]
Type
Published Article
Journal
Applied Spectroscopy
Publisher
SAGE Publications
Publication Date
April 2016
Volume
70
Issue
4
Pages
666–675
Identifiers
DOI: 10.1177/0003702816631304
PMID: 26883731
Source
Medline
Keywords
License
Unknown

Abstract

A spatial heterodyne Raman spectrometer (SHRS) is evaluated for stand-off Raman measurements in ambient light conditions using both ultraviolet (UV) and visible pulsed lasers with a gated ICCD detector. The wide acceptance angle of the SHRS simplifies optical coupling of the spectrometer to the telescope and does not require precise laser focusing or positioning of the laser on the sample. If the laser beam wanders or loses focus on the sample, as long as it is in the field of view of the SHRS, the Raman signal will still be collected. The SHRS is not overly susceptible to vibrations, and a vibration isolated optical table was not necessary for these measurements. The system performance was assessed by measuring stand-off UV and visible Raman spectra of a wide variety of materials at distances up to 18 m, using 266 nm and 532 nm pulsed lasers, with 12.4 in. and 3.8 in. aperture telescopes, respectively.

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