4 September 1998 Designing optical sensor arrays with enhanced sensitivity for explosives detection
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We have previously developed an optically-based 'artificial nose' to detect a wide variety of volatile organic compounds. An optical fiber sensor array is prepared containing a variety of differentially-reactive sensors comprised of polymer/dye combinations. When an analyte is presented in pulsatile form each sensor produces a unique fluorescence vs. time signature. The system employs neural network analysis to discriminate between many organic vapors using pattern recognition. Following an initial training step, the system can recognize 91 - 100% of a training set and greater than 84% of a test set of volatile organics. We are now attempting to detect explosives and explosive-like materials using this system. Prior work has shown that some sensors respond to compounds structurally similar to TNT (e.g. 2,4-DNT and 2,6-DNT) at saturated vapor concentrations. These preliminary results provide grounds for exploring the capacity of these and other new polymer/dye sensing combinations for detecting polynitro- compounds at low concentrations.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Keith J. Albert, Keith J. Albert, Todd A. Dickinson, Todd A. Dickinson, David R. Walt, David R. Walt, Joel White, Joel White, John S. Kauer, John S. Kauer, } "Designing optical sensor arrays with enhanced sensitivity for explosives detection", Proc. SPIE 3392, Detection and Remediation Technologies for Mines and Minelike Targets III, (4 September 1998); doi: 10.1117/12.324216; https://doi.org/10.1117/12.324216

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