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Proceedings Paper

Evaluation of a high-throughput liquid crystal tunable filter for Raman chemical imaging of threat materials
Author(s): Xinghua Wang; Thomas C. Voigt; Philip J. Bos; Matthew P. Nelson; Patrick J. Treado
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Paper Abstract

Liquid crystal tunable filters (LCTF) have been used in systems developed for Raman Chemical Imaging spectroscopy of chemical, biological and explosives threat materials. However, an ongoing challenge in detecting trace levels of materials is the limited throughput provided by previous generation LCTFs. In this article, we describe a new class of birefringent LCTFs based on a Multi-Conjugate Filter design that provides high throughput over an extended wavelength range (440 nm-750 nm). The spectral resolution, tuning accuracy, out-of-band rejection efficiency have been evaluated and are demonstrated on a Raman chemical imaging microscope platform. Detection of trace threat particulate matter in the presence of complex background with improved overall detection performance is demonstrated.

Paper Details

Date Published: 25 October 2006
PDF: 11 pages
Proc. SPIE 6378, Chemical and Biological Sensors for Industrial and Environmental Monitoring II, 637808 (25 October 2006); doi: 10.1117/12.686265
Show Author Affiliations
Xinghua Wang, ChemImage Corp. (United States)
Thomas C. Voigt, ChemImage Corp. (United States)
Philip J. Bos, Kent State Univ. (United States)
Matthew P. Nelson, ChemImage Corp. (United States)
Patrick J. Treado, ChemImage Corp. (United States)


Published in SPIE Proceedings Vol. 6378:
Chemical and Biological Sensors for Industrial and Environmental Monitoring II
Steven D. Christesen; Arthur J. Sedlacek; James B. Gillespie; Kenneth J. Ewing, Editor(s)

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