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10 February 1995 Improved cross-stack dust/opacity monitor
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Proceedings Volume 2366, Optical Instrumentation for Gas Emissions Monitoring and Atmospheric Measurements; (1995) https://doi.org/10.1117/12.205591
Event: Optical Sensing for Environmental and Process Monitoring, 1994, McLean, VA, United States
Abstract
The use of a modulated, high-intensity green LED light source has made it possible to design a highly accurate opacity monitor with no continuously moving parts. Any possible gain drift between reference and measurement detector electronics is eliminated by alternating the measurement LED with a second LED which floods both detectors with light. The signal ratio with the flood LED depends only on the relative responsivity of the two channels, and so it is possible to correct for any gain drift. Laboratory and field testing have shown that the instrument can measure opacity with an accuracy of better than 1% and is capable of meeting compliance requirements in both the USA and Europe.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Derek D. Stuart "Improved cross-stack dust/opacity monitor", Proc. SPIE 2366, Optical Instrumentation for Gas Emissions Monitoring and Atmospheric Measurements, (10 February 1995); https://doi.org/10.1117/12.205591
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