Instrument calibration and lineshape modeling for ultraspectral imagery measurements of industrial smokestack emissions

Kevin C. Gross; Pierre Tremblay; Kenneth C. Bradley; Martin Chamberland; Vincent Farley; Glen P. Perram

doi:10.1117/12.850142

12 May 2010 Instrument calibration and lineshape modeling for ultraspectral imagery measurements of industrial smokestack emissions

Kevin C. Gross, Pierre Tremblay, Kenneth C. Bradley, Martin Chamberland, Vincent Farley, Glen P. Perram

Author Affiliations +

Proceedings Volume 7695, Algorithms and Technologies for Multispectral, Hyperspectral, and Ultraspectral Imagery XVI; 769516 (2010) https://doi.org/10.1117/12.850142
Event: SPIE Defense, Security, and Sensing, 2010, Orlando, Florida, United States

Abstract

The Telops Hyper-Cam midwave (InSb 1.5-5.μm) imaging Fourier-transform spectrometer observed the plume from a coal-burning power plant smokestack. From a distance of 600 meters, the plume was captured on a 128×64 pixel sub-window of the focal-plane array with each pixel imaging a 19.5×19.5cm² region. Asymmetric interferograms were collected with long side and short side maximal optical path differences of 2.4cm and 0.9cm, respectively. Interferograms were recorded for each scan direction. The plume was strongly emissive across 1800-3000cm^-1, and raw spectra revealed emissions from CO₂, CO, H₂O, NO, SO₂, and HCl. A complete description of the instrument calibration and lineshape modeling is presented, including a simple and computationally efficient method of averaging spectra from forward- and reverse-scan interferograms that avoids the need to model a complex instrument lineshape. A simple radiative transfer model is developed to interpret the spectrum between 2565 ≤ ^~ν ≤ 3000cm^-1. Examination of the HCl spectrum demonstrates exceptional agreement between the data and an ideal instrument lineshape. For a pixel immediately above the stack exit, the plume temperature is estimated to be 399.6±0.6K with an SO₂ concentration of 376±10ppmv, and these values agree well with in situ measurements of 407.0±0.2K and 383±2ppmv, respectively.

Citation Download Citation

Kevin C. Gross, Pierre Tremblay, Kenneth C. Bradley, Martin Chamberland, Vincent Farley, and Glen P. Perram "Instrument calibration and lineshape modeling for ultraspectral imagery measurements of industrial smokestack emissions", Proc. SPIE 7695, Algorithms and Technologies for Multispectral, Hyperspectral, and Ultraspectral Imagery XVI, 769516 (12 May 2010); https://doi.org/10.1117/12.850142

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