Fourier transform infrared phase shift cavity ring down spectrometer

Elizabeth Schundler; David J. Mansur; Robert Vaillancourt; Ryan Benedict-Gill; Scott P. Newbry; James R. Engel; Julia Rentz Dupuis

doi:10.1117/12.2014392

29 May 2013 Fourier transform infrared phase shift cavity ring down spectrometer

Elizabeth Schundler, David J. Mansur, Robert Vaillancourt, Ryan Benedict-Gill, Scott P. Newbry, James R. Engel, Julia Rentz Dupuis

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Proceedings Volume 8726, Next-Generation Spectroscopic Technologies VI; 87260Z (2013) https://doi.org/10.1117/12.2014392
Event: SPIE Defense, Security, and Sensing, 2013, Baltimore, Maryland, United States

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.

Citation Download Citation

Elizabeth Schundler, David J. Mansur, Robert Vaillancourt, Ryan Benedict-Gill, Scott P. Newbry, James R. Engel, and Julia Rentz Dupuis "Fourier transform infrared phase shift cavity ring down spectrometer", Proc. SPIE 8726, Next-Generation Spectroscopic Technologies VI, 87260Z (29 May 2013); https://doi.org/10.1117/12.2014392

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KEYWORDS

Sensors

Signal to noise ratio

Mirrors

FT-IR spectroscopy

Signal detection

Modulation

Interference (communication)

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