29 May 2013 Fourier transform infrared phase shift cavity ring down spectrometer
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Abstract
We report on our current status towards the development of a prototype Fourier transform infrared phase shift cavity ring down spectrometer (FTIR-PS-CRDS) system under a U.S. EPA SBIR contract. Our system uses the inherent wavelength-dependent modulation imposed by the FTIR on a broadband thermal source for the phase shift measurement. This spectrally-dependent phase shift is proportional to the spectrally-dependent ring down time, which is proportional to the losses of the cavity including those due to molecular absorption. Our approach is a broadband and spectral range enhancement to conventional CRDS which is typically done in the near IR at a single wavelength; at the same time our approach is a sensitivity enhancement to traditional FTIR owing to the long effective path of the resonant cavity. In this paper we present a summary of the theory including performance projections and the design details of the prototype FTIR-PS-CRDS system.
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Elizabeth Schundler, Elizabeth Schundler, David J. Mansur, David J. Mansur, Robert Vaillancourt, Robert Vaillancourt, Ryan Benedict-Gill, Ryan Benedict-Gill, Scott P. Newbry, Scott P. Newbry, James R. Engel, James R. Engel, Julia Rentz Dupuis, Julia Rentz Dupuis, "Fourier transform infrared phase shift cavity ring down spectrometer", Proc. SPIE 8726, Next-Generation Spectroscopic Technologies VI, 87260Z (29 May 2013); doi: 10.1117/12.2014392; https://doi.org/10.1117/12.2014392
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