In situ measurements of nitric oxide in coal-combustion exhaust using a sensor based on a widely tunable external-cavity GaN diode laser. Academic Article

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 kW(t) 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 (1sigma) of 4.5 ppm m/(square root)Hz at 700 K was demonstrated in coal- combustion exhaust at a maximum detection rate of 5 Hz.

authors

• Caton, Jerald

published proceedings

• Appl Opt

author list (cited authors)

• Anderson, T. N., Lucht, R. P., Priyadarsan, S., Annamalai, K., & Caton, J. A.

citation count

• 18

complete list of authors

• Anderson, Thomas N||Lucht, Robert P||Priyadarsan, Soyuz||Annamalai, Kalyan||Caton, Jerald A

publication date

• July 2007

publisher

• Optica Publishing Group  Publisher

published in

• n1559-128XISSN  Journal

keywords

• Absorption
• Air Pollutants
• Borates
• Coal
• Crystallization
• Environmental Monitoring
• Lasers
• Nitric Oxide
• Optics And Photonics
• Oscillometry
• Spectrophotometry
• Spectrophotometry, Ultraviolet
• Temperature
• Time Factors

Digital Object Identifier (DOI)

• 10.1364/ao.46.003946

start page

• 3946

end page

• 3957

volume

• 46

issue

• 19

URL

• http://dx.doi.org/10.1364/ao.46.003946