Improved cross-stack dust/opacity monitor

Derek D. Stuart

doi:10.1117/12.205591

10 February 1995 Improved cross-stack dust/opacity monitor

Derek D. Stuart

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.

Citation Download Citation

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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KEYWORDS

Opacity

Light emitting diodes

Sensors

Calibration

Electronics

Floods

Light sources

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