Performing IR spectroscopy inside a gas chromatographic column

Christopher J. Breshike; Robert Furstenberg; T. J. Huffman; Drew Finton; R. Andrew McGill

doi:10.1117/12.2618785

30 May 2022 Performing IR spectroscopy inside a gas chromatographic column

Christopher J. Breshike, Robert Furstenberg, T. J. Huffman, Drew Finton, R. Andrew McGill

Proceedings Volume 12116, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XXIII; 121160W (2022) https://doi.org/10.1117/12.2618785
Event: SPIE Defense + Commercial Sensing, 2022, Orlando, Florida, United States

Abstract

The ability to rapidly detect hazardous airborne chemicals in a complex chemical background with high fidelity remains a significant challenge. Separation through traditional Gas chromatography (GC) can significantly augment most detection technologies for high fidelity detection, but with the disadvantage of requiring the chemicals to elute off the column before detection can occur. This translates to added time for any decision-making process. Microfabrication of GC systems has reduced footprint and power consumption, but the end-of-column detection paradigm has remained. We present the first in-column detection system which probes the GC stationary phase, coated on an IR transparent column substrate, with an active infrared source. The optical evanescent field interacting with the stationary phase (US. Patent# 9,599,567, Navy Case number 211024-US1) allows for detection along the column without having to wait for complete elution. These spectral signatures, collected at different regions along the column, are analyzed by an algorithm to identify components in a complex mixture. We present results with an ATR-based system with a molded micro-GC column whose base comprises an optically transparent material coated with the stationary phase on proof of concept mixtures.

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Christopher J. Breshike, Robert Furstenberg, T. J. Huffman, Drew Finton, and R. Andrew McGill "Performing IR spectroscopy inside a gas chromatographic column", Proc. SPIE 12116, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XXIII, 121160W (30 May 2022); https://doi.org/10.1117/12.2618785

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KEYWORDS

Infrared spectroscopy

Semiconducting wafers

Quantum cascade lasers

Chromatography

Prisms

Germanium

Signal detection

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