22 September 2011 Improvements in NDIR gas detection within the same optical chamber
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Non-dispersive infrared (NDIR) is a well known technique for gas concentration monitoring. Lead salt photoconductors and thermopile detectors are typically used. Together with gas filter correlation (GFC) they are the basis for a reference standard in environmental gas monitoring like carbon monoxide determination and other gas species. To increase gas sensitivity, a multi-pass optical cavity is often used. In this contribution we propose a new optical design that allows for auto-reference multiple gas detection. It basically consists of an array of White's cell multi-pass camera that allows multiple channels with independent lengths inside the same volume. We explore its performance for carbon monoxide detection and based on recent commercial developments in infrared detector and emitter technologies.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Juan Carlos Martinez-Anton, Manuel Silva-Lopez, "Improvements in NDIR gas detection within the same optical chamber", Proc. SPIE 8167, Optical Design and Engineering IV, 816723 (22 September 2011); doi: 10.1117/12.896856; https://doi.org/10.1117/12.896856


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