Stand-off FTIR spectroscopy utilizing a long-wave infrared supercontinuum source

Ramon A. Martinez; Kaiwen Guo; Tianqu Zhai; Fred L. Terry; Mohammed N. Islam; Lukasz Maksymiuk; Robert L. Maynard; Michael J. Freeman; Carl A. DeWilde; Agustin I. Ifarraguerri

doi:10.1117/12.2513908

7 March 2019 Stand-off FTIR spectroscopy utilizing a long-wave infrared supercontinuum source

Ramon A. Martinez, Kaiwen Guo, Tianqu Zhai, Fred L. Terry, Mohammed N. Islam, Lukasz Maksymiuk, Robert L. Maynard, Michael J. Freeman, Carl A. DeWilde, Agustin I. Ifarraguerri

Author Affiliations +

Proceedings Volume 10897, Fiber Lasers XVI: Technology and Systems; 108971Q (2019) https://doi.org/10.1117/12.2513908
Event: SPIE LASE, 2019, San Francisco, California, United States

Abstract

We demonstrate a prototype sensor capable of measuring specular and diffuse reflectance spectra from samples 3.6 m away. The sensor utilizes mid-wave to long-wave infrared supercontinuum light coupled into a rotational FTIR spectrometer to actively probe remote samples. We measure the diffuse reflectance of acetaminophen at 41.77 μg/cm² on a glass substrate and find that a modified Bobbert-Vlieger analysis can estimate the effects of particle size distribution on return spectra. We find that the measured return from stand-off particulate measurements depends not only on the chemical identity, but also the size and distribution of particles on the substrate.

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Ramon A. Martinez, Kaiwen Guo, Tianqu Zhai, Fred L. Terry, Mohammed N. Islam, Lukasz Maksymiuk, Robert L. Maynard, Michael J. Freeman, Carl A. DeWilde, and Agustin I. Ifarraguerri "Stand-off FTIR spectroscopy utilizing a long-wave infrared supercontinuum source", Proc. SPIE 10897, Fiber Lasers XVI: Technology and Systems, 108971Q (7 March 2019); https://doi.org/10.1117/12.2513908

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