29 December 2004 A traceable quantitative infrared spectral database of chemical agents
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Recent experimental field trials have demonstrated the ability of both Fourier transform infrared (FTIR) and active light detection and ranging (LIDAR) sensors to detect particulate matter, including simulants for biological materials. Both systems require a reliable, validated, quantitative database of the mid infrared spectra of the targeted threat agents. While several databases are available, none are validated and traceable to primary standards for reference quality reliability. Most of the existing chemical agent databases have been developed using a bubbler or syringe-fed vapor generator, and all are fraught with errors and uncertainties as a result. In addition, no quantitative condensed phase data on the low volatility chemicals and biological agents have been reported. We are filling this data gap through the systematic measurement of gas phase chemical agent materials generated using a unique vapor-liquid equilibrium approach that allows the quantitation of the cross-sections using a mass measurement calibrated to primary, National Institutes of Standards and Technology (NIST) standards. In addition, we have developed quantitative methods for the measurement of condensed phase materials in both transmission and diffuse reflectance modes. The latter data are valuable for the development of complex index of refraction data, which is required for both system modeling and algorithm development of both FTIR and LIDAR based sensor systems. We will describe our measurement approach and progress toward compiling the first known comprehensive and validated database of both vapor and condensed phase chemical warfare agents.
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Alan C. Samuels, Alan C. Samuels, Barry R. Williams, Barry R. Williams, Avishai Ben-David, Avishai Ben-David, Melissa Hulet, Melissa Hulet, Geoffrey J. Roelant, Geoffrey J. Roelant, Ronald W. Miles, Ronald W. Miles, Norman Green, Norman Green, Changjiang Zhu, Changjiang Zhu, } "A traceable quantitative infrared spectral database of chemical agents", Proc. SPIE 5617, Optically Based Biological and Chemical Sensing for Defence, (29 December 2004); doi: 10.1117/12.578974; https://doi.org/10.1117/12.578974

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