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Combined time- and space-resolved Raman spectrometer for the non-invasive depth profiling of chemical hazards

Cletus, Biju, Olds, William J., Izake, Emad L., Sundarajoo, Shankaran, Fredericks, Peter M., & Jaatinen, Esa (2012) Combined time- and space-resolved Raman spectrometer for the non-invasive depth profiling of chemical hazards. Analytical and Bioanalytical Chemistry.

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Abstract

A time-resolved inverse spatially offset Raman spectrometer was constructed for depth profiling of Raman-active substances under both the lab and the field environments. The system operating principles and performance are discussed along with its advantages relative to traditional continuous wave spatially offset Raman spectrometer. The developed spectrometer uses a combination of space- and time-resolved detection in order to obtain high-quality Raman spectra from substances hidden behind coloured opaque surface layers, such as plastic and garments, with a single measurement. The time-gated spatially offset Raman spectrometer was successfully used to detect concealed explosives and drug precursors under incandescent and fluorescent background light as well as under daylight. The average screening time was 50 s per measurement. The excitation energy requirements were relatively low (20 mW) which makes the probe safe for screening hazardous substances. The unit has been designed with nanosecond laser excitation and gated detection, making it of lower cost and complexity than previous picosecond-based systems, to provide a functional platform for in-line or in-field sensing of chemical substances.

Impact and interest:

9 citations in Scopus
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10 citations in Web of Science®

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147 since deposited on 14 Feb 2012
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ID Code: 48609
Item Type: Journal Article
Additional Information: Springer OnlineFirst publication
Keywords: Time-resolved SORS, Raman spectroscopy, Forensic science, Noninvasive detection, Depth profiling, In-field screening, National security
DOI: 10.1007/s00216-012-5792-2
ISSN: 1618-2642
Subjects: Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > OPTICAL PHYSICS (020500)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > ANALYTICAL CHEMISTRY (030100)
Divisions: Past > Schools > Chemistry
Past > QUT Faculties & Divisions > Faculty of Science and Technology
Past > Schools > Physics
Copyright Owner: Copyright 2012 Springer
Copyright Statement: The original publication is available at SpringerLink http://www.springerlink.com
Deposited On: 15 Feb 2012 08:37
Last Modified: 15 Feb 2012 21:38

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