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Proceedings Paper

Active range-gated spectrometric standoff detection and characterization of bioaerosols
Author(s): Jean-Robert Simard; Pierre Mathieu; Vincent Larochelle; Jean-Marc Theriault; Gilles Roy; John E. McFee; Jim Ho
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Paper Abstract

In atmospheric sensing, one application that has demonstrated several impressive successes over the last two decades is LIght Detection And Ranging (LIDAR). With elastic signal returns, this technique remotely provides information such as the particle density and, for a multiple field of view LIDAR, the distribution in size of the aerosols as a function of the range along the probing laser beam. For this type of application, the return signal has the same spectrum than the laser source. Some specific techniques, such as Raman or resonant LIDARs, collect the return signal at wavelengths other than the source. However, these signals are usually narrow spectrally and are collected with a single bandpass spectral filter. Recently, the Canadian Defence Research and Development Branch has initiated the evaluation of a novel LIDAR concept which opens the possibility of collecting simultaneously the detailed spectral information contained in spectrally wide return signals. One drawback with this approach is the loss of simultaneous information at multiple ranges, i.e., the spectral information is available only for a specific range. Nevertheless, there are applications where the partial loss of range information is compensated by the gain resulting from the spectral information. This paper describes the concept and reviews the general model predicting the capability of this technique for the standoff detection of bioaerosols. It shows a numerical simulation of the anticipated spectral profiles collected with the proposed active range-gated fluorescent LIDAR for a particular bioaerosol as a function of ranges, and for both day and night operational scenarios.

Paper Details

Date Published: 28 May 1999
PDF: 13 pages
Proc. SPIE 3707, Laser Radar Technology and Applications IV, (28 May 1999); doi: 10.1117/12.351335
Show Author Affiliations
Jean-Robert Simard, Defence Research Establishment Valcartier (Canada)
Pierre Mathieu, Defence Research Establishment Valcartier (Canada)
Vincent Larochelle, Defence Research Establishment Valcartier (Canada)
Jean-Marc Theriault, Defence Research Establishment Valcartier (Canada)
Gilles Roy, Defence Research Establishment Valcartier (Canada)
John E. McFee, Defence Research Establishment Suffield (Canada)
Jim Ho, Defence Research Establishment Suffield (Canada)

Published in SPIE Proceedings Vol. 3707:
Laser Radar Technology and Applications IV
Gary W. Kamerman; Christian Werner, Editor(s)

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