Development of a probe for in-situ measurements of major species in a pool fire using multiplexed near-IR TDLAS

Philip J. Santangelo; Peter D. Ludowise; Christopher R. Shaddix; Sarah W. Allendorf; David K. Ottesen; J. R. Ross; Howard A. Johnsen; Gary L. Hubbard

doi:10.1117/12.366454

25 October 1999 Development of a probe for in-situ measurements of major species in a pool fire using multiplexed near-IR TDLAS

Philip J. Santangelo, Peter D. Ludowise, Christopher R. Shaddix, Sarah W. Allendorf, David K. Ottesen, J. R. Ross, Howard A. Johnsen, Gary L. Hubbard

Author Affiliations +

Proceedings Volume 3758, Application of Tunable Diode and Other Infrared Sources for Atmospheric Studies and Industrial Processing Monitoring II; (1999) https://doi.org/10.1117/12.366454
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

In this paper we discuss the development of a tunable diode laser absorption spectroscopy probe to simultaneously measure, in situ concentrations of 4 major species (CO, C₂H₂, CH₄, and H₂O) and the gas phase temperature in a pool fire. The difficulty in making these types of measurements is intrinsic to the environment itself. A large fire is composed of very hot (> 1000 K), turbulent gases and highly radiating and absorbing soot particles. Fiber optic cables are used to transport laser radiation into the fire via a water-cooled probe. This paper focuses on probe design issues, such as the optimization of open path, multipass optics for a turbulent, particulate- laden flow, and the application of high-frequency wavelength modulation spectroscopy to frequency-domain multiplexing of diode lasers.

Citation Download Citation

Philip J. Santangelo, Peter D. Ludowise, Christopher R. Shaddix, Sarah W. Allendorf, David K. Ottesen, J. R. Ross, Howard A. Johnsen, and Gary L. Hubbard "Development of a probe for in-situ measurements of major species in a pool fire using multiplexed near-IR TDLAS", Proc. SPIE 3758, Application of Tunable Diode and Other Infrared Sources for Atmospheric Studies and Industrial Processing Monitoring II, (25 October 1999); https://doi.org/10.1117/12.366454

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