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Digital micromirror devices in Raman trace detection of explosives
Umeå University, Faculty of Science and Technology, Department of Physics.
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2016 (English)In: Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XXI / [ed] Steven S. Bishop, Jason C. Isaacs, SPIE - International Society for Optical Engineering, 2016, 982312Conference paper (Refereed)
Abstract [en]

Imaging Raman spectroscopy based on tunable filters is an established technique for detecting single explosives particles at stand-off distances. However, large light losses are inherent in the design due to sequential imaging at different wavelengths, leading to effective transmission often well below 1 %. The use of digital micromirror devices (DMD) and compressive sensing (CS) in imaging Raman explosives trace detection can improve light throughput and add significant flexibility compared to existing systems. DMDs are based on mature microelectronics technology, and are compact, scalable, and can be customized for specific tasks, including new functions not available with current technologies. This paper has been focusing on investigating how a DMD can be used when applying CS-based imaging Raman spectroscopy on stand-off explosives trace detection, and evaluating the performance in terms of light throughput, image reconstruction ability and potential detection limits. This type of setup also gives the possibility to combine imaging Raman with non-spatially resolved fluorescence suppression techniques, such as Kerr gating. The system used consists of a 2nd harmonics Nd:YAG laser for sample excitation, collection optics, DMD, CMOS-camera and a spectrometer with ICCD camera for signal gating and detection. Initial results for compressive sensing imaging Raman shows a stable reconstruction procedure even at low signals and in presence of interfering background signal. It is also shown to give increased effective light transmission without sacrificing molecular specificity or area coverage compared to filter based imaging Raman. At the same time it adds flexibility so the setup can be customized for new functionality.

Place, publisher, year, edition, pages
SPIE - International Society for Optical Engineering, 2016. 982312
Proceedings of SPIE, ISSN 0277-786X ; 9823
Keyword [en]
imaging Raman, digital micromirror device, DMD, explosives, compressive sensing, stand-off, trace detection, coded aperture
National Category
Atom and Molecular Physics and Optics
URN: urn:nbn:se:umu:diva-126766DOI: 10.1117/12.2223753ISI: 000383223700031ISBN: 978-1-5106-0064-5 (print)OAI: diva2:1037760
Conference on Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XXI, APR 18-21, 2016, Baltimore, MD
Available from: 2016-10-18 Created: 2016-10-13 Last updated: 2016-10-18Bibliographically approved

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