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4 May 2012 Proposal for a standoff bio-agent detection SWIR/MWIR differential scattering lidar
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Abstract
A SWIR/MWIR spectroscopic lidar is proposed for standoff bio-agent cloud detection using simultaneous broadband differential scattering (DISC). Measurements and/or modeling of DISC spectra of simulants are revisited and the rational of the SWIR/MWIR DISC approach is explained, especially in light of the LWIR DISC experiments and conclusions done elsewhere. Preliminary results on the construction of a low power non-linear broadband source in the SWIR/MWIR are presented. Light from a 1064-nm pump laser is passed through a period and temperature tunable PPMgO:LN Optical Parametric Generator (OPG) to generate broadband light with a full width at half maximum (FWHM) of 10 to >100 nm in the SWIR/MWIR between 1.5 and 3.9 μm. Broadband coherent light from this source is to be emitted towards a cloud that generates back-scattering. This source is being used in a short-range chemical remote detection breadboard, showing the possible dual use of the setup. Light collected by the receiver telescope is coupled to a grating spectrometer and the return signal (DISC in the proposed setup) is detected using a gated MCT-APD array in much the same way clouds are interrogated using UV-LIF. A programmable volume of space along the laser beam path is imaged at the entrance of the spectrometer and 320 spectral channels can be measured simultaneously, attenuating the effects of atmospheric instabilities on DISC measurements. Proposed follow-on work will be presented.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Simon Lambert-Girard, Nicolas Hô, Bruno Bourliaguet, Paul-François Paradis, Michel Piché, and François Babin "Proposal for a standoff bio-agent detection SWIR/MWIR differential scattering lidar", Proc. SPIE 8358, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIII, 835805 (4 May 2012); https://doi.org/10.1117/12.918680
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