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Proceedings Paper

Improved cross-stack dust/opacity monitor
Author(s): Derek D. Stuart
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Paper 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.

Paper Details

Date Published: 10 February 1995
PDF: 7 pages
Proc. SPIE 2366, Optical Instrumentation for Gas Emissions Monitoring and Atmospheric Measurements, (10 February 1995); doi: 10.1117/12.205591
Show Author Affiliations
Derek D. Stuart, Land Combustion (United Kingdom)

Published in SPIE Proceedings Vol. 2366:
Optical Instrumentation for Gas Emissions Monitoring and Atmospheric Measurements
Michael G. Yost; Dennis K. Killinger; Joseph Leonelli; William Vaughan; Dennis K. Killinger; William Vaughan; Michael G. Yost, Editor(s)

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