Diode laser absorption sensor system for measurements of combustion pollutants

Radu M. Mihalcea; Douglas S. Baer; Ronald K. Hanson

doi:10.1117/12.293387

21 November 1997 Diode laser absorption sensor system for measurements of combustion pollutants

Radu M. Mihalcea, Douglas S. Baer, Ronald K. Hanson

Proceedings Volume 3172, Optical Technology in Fluid, Thermal, and Combustion Flow III; (1997) https://doi.org/10.1117/12.293387
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

A diode-laser sensor system has been applied to measure the concentrations of NO, N₂O, CO, and CO₂ in combustion gases using absorption spectroscopy and fast extraction- sampling techniques. Measured survey spectra of the NO 3v band and H₂O lines from the v₂ + v₃ band in the spectral region from 5556 cm^-1 to 5572 cm^-1 were recorded and compared to calculated spectra to select optimum transitions for NO detection. Similarly, measured survey spectra of the N₂O 3v₃ band from 6535 cm^-1 to 6600 cm^-1 were used to identify optimum transitions for N₂O detection. High- resolution NO absorption measurements were recorded in a fast-flow multipass cell containing probe-sampled combustion gases to determine NO concentrations in a laminar, premixed CH₄/air flame, seeded with NH₃. For fuel-lean conditions, the measured No mole fractions corresponded to 68 percent of the injected NH₃. For fuel-rich conditions, the fraction of NH₃ converted to NO decreased with increasing equivalence ratio. In additional experiments, CO and CO₂ absorption measurements were used to determine species concentrations above a laminar, premixed CH₄/air flame. Good agrement was found between measured CO and CO₂ concentrations and calculated chemical equilibrium values.

Citation Download Citation

Radu M. Mihalcea, Douglas S. Baer, and Ronald K. Hanson "Diode laser absorption sensor system for measurements of combustion pollutants", Proc. SPIE 3172, Optical Technology in Fluid, Thermal, and Combustion Flow III, (21 November 1997); https://doi.org/10.1117/12.293387

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