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In situ and on-line monitoring of CO in an industrial glass furnace by mid-infrared difference-frequency generation laser spectroscopy

Alireza Khorsandi, Ulrike Willer, Lothar Wondraczek, and Wolfgang Schade

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Abstract

A compact mid-infrared (MIR) laser spectrometer based on difference-frequency generation (DFG) is applied as a portable and sensitive gas sensor for industrial process control and pollutant monitoring. We demonstrate the performance of such a MIR DFG gas sensor by recording the absorption spectra of the carbon monoxide (CO) P(28) absorption line in the atmosphere of a gas-fired glass melting furnace. For a gas temperature of approximately 1100 °C, the CO concentration in the recuperator channel is measured to be 400 parts per million.

© 2004 Optical Society of America

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