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Special Section on Chemical, Biological, Radiological, and Explosive Sensing

New approach to remote gas-phase chemical quantification: selected-band algorithm

[+] Author Affiliations
Sidi Niu

Northeastern University, 360 Huntington Avenue, Boston, Massachusetts 02115

Steven E. Golowich

MIT Lincoln Laboratory, 244 Wood Street, Lexington, Massachusetts 02420

Vinay K. Ingle

Northeastern University, 360 Huntington Avenue, Boston, Massachusetts 02115

Dimitris G. Manolakis

MIT Lincoln Laboratory, 244 Wood Street, Lexington, Massachusetts 02420

Opt. Eng. 53(2), 021111 (Dec 23, 2013). doi:10.1117/1.OE.53.2.021111
History: Received July 31, 2013; Revised October 24, 2013; Accepted November 22, 2013
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Abstract.  We propose an algorithm for standoff quantification of chemical vapor plumes from hyperspectral imagery. The approach is based on the observation that the quantification problem can be easily solved in each pixel with the use of just a single spectral band if the radiance of the pixel in the absence of the plume is known. This plume-absent radiance may, in turn, be recovered from the radiance of the subset of spectral bands in which the gas species is transparent. This “selected-band” algorithm is most effective when applied to gases with narrow spectral features, and are therefore transparent over many bands. We also demonstrate an iterative version that expands the range of applicability. Simulations show that the new algorithm attains the accuracy of existing nonlinear algorithms, while its computational efficiency is comparable to that of linear algorithms.

© 2014 Society of Photo-Optical Instrumentation Engineers

Citation

Sidi Niu ; Steven E. Golowich ; Vinay K. Ingle and Dimitris G. Manolakis
"New approach to remote gas-phase chemical quantification: selected-band algorithm", Opt. Eng. 53(2), 021111 (Dec 23, 2013). ; http://dx.doi.org/10.1117/1.OE.53.2.021111


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