Multipath extinction detector for chemical sensing

Elizabeth C. Schundler; David J. Mansur; Michael Hilton; John Dixon; Stephanie Craig; Julia R. Dupuis

doi:10.1117/12.2622464

30 May 2022 Multipath extinction detector for chemical sensing

Elizabeth C. Schundler, David J. Mansur, Michael Hilton, John Dixon, Stephanie Craig, Julia R. Dupuis

Proceedings Volume 12116, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XXIII; 121160R (2022) https://doi.org/10.1117/12.2622464
Event: SPIE Defense + Commercial Sensing, 2022, Orlando, Florida, United States

Abstract

A novel multi-path extinction detector (M-PED) is being developed for point detection, identification and quantification of vapor phase chemicals. M-PED functions by pairing a broadband long-wave infrared (LWIR) quantum cascade laser with a novel sample cell, designed to simultaneously measure chemical absorption at multiple pathlengths and wavelengths. The pathlength samples are angularly separated in one dimension, such that a diffraction grating can be used to measure wavelength data in the orthogonal dimension using a compact, low-cost microbolometer array. The resulting data matrix is fit to Beer’s Law in two dimensions to accurately quantify chemical concentration while rejecting common mode noise (e.g. laser amplitude noise). The design, characterization and a capability demonstration of the advanced prototype sensor are presented.

Conference Presentation

Citation Download Citation

Elizabeth C. Schundler, David J. Mansur, Michael Hilton, John Dixon, Stephanie Craig, and Julia R. Dupuis "Multipath extinction detector for chemical sensing", Proc. SPIE 12116, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XXIII, 121160R (30 May 2022); https://doi.org/10.1117/12.2622464

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