Infrared tunable diode laser diagnostics for aircraft exhaust emissions characterization

Joda C. Wormhoudt; Mark S. Zahniser; David D. Nelson Jr.; J. Barry McManus; R. C. Miake-Lye; Charles E. Kolb

doi:10.1117/12.171299

18 March 1994 Infrared tunable diode laser diagnostics for aircraft exhaust emissions characterization

Joda C. Wormhoudt, Mark S. Zahniser, David D. Nelson Jr., J. Barry McManus, R. C. Miake-Lye, Charles E. Kolb

Proceedings Volume 2122, Laser Applications in Combustion and Combustion Diagnostics II; (1994) https://doi.org/10.1117/12.171299
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

The atmospheric effects of stratospheric aircraft component of the NASA High Speed Research Program will require measurements of trace gas concentrations in the exhausts of high speed civil transport engines. In parallel with the development of these engines by NASA and its industrial partners, a portable infrared tunable diode laser apparatus has been assembled and tested which is capable of both in situ and extractive sampling of combustion gas flows. Infrared diode laser absorption is sensitive, quantitative, and applicable to a wide range of molecular species. In the present apparatus, sensitive detection is achieved by rapid frequency scanning and real-time nonlinear least squares fitting and background subtraction. Sensitivity is further increased for extractive sampling by an advanced design multiple pass cell which gives longer path lengths in smaller volumes. Observations of a laboratory flat flame burner are reported. These observations and spectroscopic models are used to predict detection sensitivities in exhausts and other combustion systems.

Citation Download Citation

Joda C. Wormhoudt, Mark S. Zahniser, David D. Nelson Jr., J. Barry McManus, R. C. Miake-Lye, and Charles E. Kolb "Infrared tunable diode laser diagnostics for aircraft exhaust emissions characterization", Proc. SPIE 2122, Laser Applications in Combustion and Combustion Diagnostics II, (18 March 1994); https://doi.org/10.1117/12.171299

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