Abstract

A diode-laser-based sensor has been developed to measure nitric oxide mole fractions using absorption spectroscopy. The sensor is based on sum-frequency mixing of a 395  nm external-cavity diode laser (ECDL) and a 532   nm laser in a beta-barium-borate crystal. Using a new tuning scheme, the GaN ECDL wavelength was modulated over 90   GHz without mode hops. The sensor was applied for measurements of the NO mole fraction in the exhaust of a laboratory-scale, 30  kWt coal-fired boiler burner. Absorption measurements were successfully performed despite severe attenuation by scattering from ash particles in the exhaust stream and on the exhaust-section windows. A detection limit (1σ) of 4.5ppm   m/Hz at 700 K was demonstrated in coal- combustion exhaust at a maximum detection rate of 5  Hz.

© 2007 Optical Society of America

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