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Proceedings Paper

Introducing depolarisation into an inexpensive simple cloud sensor for standoff aerosol detection
Author(s): Rebecca J. Hopkins; Joseph W. Jones; Stephen J. Barrington; Virginia Foot; Karen L. Baxter
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Paper Abstract

Light detection and ranging (LIDAR) has potential to be a successful technique for remote detection of airborne biological warfare agents (BWA) that pose a health hazard. Potential techniques for detecting BWA often use spectroscopy to probe molecular structure properties (e.g. UV-fluorescence, Raman and differential absorption spectroscopy). An alternative approach is to differentiate BWA from background interferents by their differing morphology; depolarisation offers one such method. Here, we investigate the feasibility of introducing depolarisation into a short range (approximately 10 m) LIDAR designed to be a simple, inexpensive, low power consumption, portable instrument. T-matrix calculations are presented for a randomly oriented, polydisperse size distribution of Bacillus atrophaeus spheroids. The relationship between backscatter depolarisation and particle aspect ratio is investigated at several incident wavelengths corresponding to those produced by low cost, commercially available laser sources. Through a series of simulations, we determine the best combination of wavelengths for a multi-wavelength instrument design that exploits the concept of normalised depolarisation to determine particle aspect ratio, with the possibility of facilitating BWA detection.

Paper Details

Date Published: 29 April 2008
PDF: 8 pages
Proc. SPIE 6972, Polarization: Measurement, Analysis, and Remote Sensing VIII, 697212 (29 April 2008); doi: 10.1117/12.790420
Show Author Affiliations
Rebecca J. Hopkins, DSTL (United Kingdom)
Joseph W. Jones, DSTL (United Kingdom)
Stephen J. Barrington, DSTL (United Kingdom)
Virginia Foot, DSTL (United Kingdom)
Karen L. Baxter, DSTL (United Kingdom)

Published in SPIE Proceedings Vol. 6972:
Polarization: Measurement, Analysis, and Remote Sensing VIII
David B. Chenault; Dennis H. Goldstein, Editor(s)

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