Mapping chemical concentrations indoors using open-path FTIR spectroscopy and computed tomography: chamber studies

Arindam Samanta; Lori A. Todd

doi:10.1117/12.210793

31 May 1995 Mapping chemical concentrations indoors using open-path FTIR spectroscopy and computed tomography: chamber studies

Arindam Samanta, Lori A. Todd

Author Affiliations +

Proceedings Volume 2365, Optical Sensing for Environmental and Process Monitoring; (1995) https://doi.org/10.1117/12.210793
Event: Optical Sensing for Environmental and Process Monitoring, 1994, McLean, VA, United States

Abstract

This paper presents studies conducted in an indoor exposure chamber, on the detection and mapping of chemical concentrations using open-path FTIR (Fourier Transform Infrared) spectroscopy and computed tomography. A vertical flow indoor air chamber having roller tracks at the periphery was used. The source and detector of an open-path FTIR spectrometer were mounted on separate tables place on the tracks. Sulfur hexafluoride was injected from the floor of the chamber and the plume was scanned using the FTIR spectrometer. Different ray configurations were used to scan and map the plume on a 2D plane. To test the validity of the FTIR/computed tomography system for mapping gases, point samples from within the chamber were drawn remotely from ports and were analyzed using an electron capture detector. The concentrations indicated by the gas samples at different points were compared to the tomographically mapped concentrations. A comparison of mapped concentrations with point sampled concentrations were made with respect to position, and concentration of the chemical peak. A comparison of different algorithms for mapping chemical concentrations was performed.

Citation Download Citation

Arindam Samanta and Lori A. Todd "Mapping chemical concentrations indoors using open-path FTIR spectroscopy and computed tomography: chamber studies", Proc. SPIE 2365, Optical Sensing for Environmental and Process Monitoring, (31 May 1995); https://doi.org/10.1117/12.210793

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