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Mapping air contaminants indoors using a prototype computed tomography system

A Samanta1, L A Todd

  • 1Department of Environmental Sciences and Engineering, University of North Carolina at Chapel Hill 27599, USA.

The Annals of Occupational Hygiene
|December 1, 1996
PubMed
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A new open-path Fourier transform infrared spectrometer-computed tomography (OP-FTIR-CT) system accurately maps sulphur hexafluoride plumes. This non-invasive technology shows promise for monitoring workplace air contaminants and emissions.

Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Spectroscopy

Background:

  • Accurate monitoring of airborne contaminants is crucial for workplace safety and environmental protection.
  • Traditional point-sampling methods can be time-consuming and may not capture spatial concentration variations effectively.
  • Development of real-time, non-invasive monitoring techniques is needed for dynamic emission sources.

Purpose of the Study:

  • To evaluate the performance of a prototype open-path Fourier transform infrared spectrometer-computed tomography (OP-FTIR-CT) system for measuring and mapping gas plumes.
  • To assess the accuracy of the OP-FTIR-CT system in estimating gas concentrations compared to established methods.
  • To investigate the impact of different system configurations on the quality of concentration map reconstruction.

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Main Methods:

  • Utilized a prototype OP-FTIR-CT system within an indoor exposure chamber to measure single and multiple plumes of sulphur hexafluoride.
  • Employed two distinct OP-FTIR spectrometer ray configurations (100 and 136 rays) for chamber scanning and concentration map reconstruction.
  • Validated OP-FTIR-CT concentration estimates against point samples obtained using gas chromatography with an electron capture detector.

Main Results:

  • The OP-FTIR-CT system successfully mapped the spatial distribution of sulphur hexafluoride concentration peaks.
  • Concentration estimations by the OP-FTIR-CT system showed a 4-50% accuracy range compared to gas chromatography measurements.
  • Reconstructed map quality was significantly influenced by the ray configuration and the total scanning time.

Conclusions:

  • The OP-FTIR-CT system demonstrates capability for accurate, real-time, non-invasive mapping of gas concentrations.
  • The technique is effective in generating spatially and temporally resolved maps of multiple chemicals.
  • OP-FTIR-CT presents a promising tool for monitoring industrial emissions and assessing workplace exposure to air pollutants.