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A Look at Open-Path and Extractive Optical Gas Detection
Spellicy, Robert L. EM, p 14-20, Nov 2003

Optical monitors that offer near-real-time detection and reporting of gaseous compounds have become the instruments of choice to perform multiple environmental and industrial monitoring tasks, largely due to their unique capabilities. This article provides an overview of the basic concepts of optical monitoring technology and serves as an introduction to the three articles that follow. The emphasis in this issue is particular applications of open-path and extractive monitoring. Newer optical instruments in use today include the Fourier transform infrared (FTIR) spectrometer, tunable diode laser (TDL) systems, differential optical absorption spectrometry (DOAS), and light detection and ranging (Lidar) systems.


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