NDLI: Diode-Laser-Based Sensor Measurements of Nitric Oxide and Carbon Monoxide in Combustion Exhaust Streams

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Thomas, N. Anderson Barron-Jimenez, Rodolfo Jerald, A. Caton Robert, P. Lucht Roy, Sukesh Michael, S. Brown James, R. Gord Walther, Thomas Critchley, Ian Flamand, Luis
Copyright Year	2003
Abstract	All-solid-state continuous-wave (cw) laser systems for ultraviolet (UV) absorption measurements of the nitric oxide (NO) molecule and mid-infrared (IR) absorption measurements of carbon monoxide (CO) were developed and demonstrated. For the NO sensor, 250 nW of tunable cw UV radiation at 226.8 nm is produced by sum-frequency-mixing in a beta-barium borate crystal. For the CO sensor, 2μW of tunable cw IR radiation at 4.5 μm is produced by difference-frequency mixing in a periodically-poled lithium niobate crystal. A tunable external-cavity diode laser (ECDL) provides one of the fundamental beams for both processes so that the wavelength of the generated UV/IR can be tuned over NO/CO absorption lines to produce a fully resolved absorption spectrum. The sensors were used for measurements in the exhaust stream of an operating auxiliary power unit (APU) gas turbine engine and a well-stirred reactor (WSR). During these tests, NO was measured in the exhaust at levels below 10 ppm. For measurements at levels above 20 ppm, the NO emission levels obtained using the new sensor agreed with the results of probe sampling chemiluminescent analyzer results to within 10%. A detection limit of 0.8 ppm of per meter path length at 1000 K is estimated for the NO sensor. Measurements with the CO sensor demonstrated an agreement with extractive probe sampling to within 15%. The estimated detection limit of the CO sensor is a few ppm per meter path length at 1000 K.
Sponsorship	Heat Transfer Division
Starting Page	185
Ending Page	190
Page Count	6
File Format	PDF
ISBN	0791836940
DOI	10.1115/HT2003-47532
e-ISBN	0791836797
Volume Number	Heat Transfer: Volume 2
Conference Proceedings	ASME 2003 Heat Transfer Summer Conference
Language	English
Publisher Date	2003-07-21
Publisher Place	Las Vegas, Nevada, USA
Access Restriction	Subscribed
Subject Keyword	Crystals Lithium Combustion Carbon Waves Wavelength Exhaust systems Emissions Cavities Ultraviolet radiation Absorption Gas turbines Lasers Infrared radiation Sensors Probes
Content Type	Text
Resource Type	Article

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