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Fiber-bundle-based 2D Raman and Rayleigh imaging for major species and temperature measurement in laminar flames

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Abstract

In this Letter, we introduce a novel fiber-bundle-based 2D Raman and Rayleigh imaging system for 2D measurements of major species mole fractions and temperature in flames. A cascade of dichroic mirrors and bandpass filters separate the Raman signal associated with each major species and direct it to a custom-built four-inputs/one-output fiber bundle. The single output of the fiber bundle allows simultaneous detection of four species by using a single back-illuminated CCD camera. The novel imaging system combined with a pulse-burst laser operated at 10 kHz and a 10 kHz optical shutter is characterized from measurements in a Mckenna burner and then applied to a flame stabilized over a Santoro burner. The work is, to the best of our knowledge, the first demonstration of 2D measurements of temperature and major species (i.e., N2, O2, H2, and H2O) in H2–air diffusion flames at atmospheric pressure.

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Supplementary Material (1)

NameDescription
Supplement 1       . (a) An image of 1951 USAF test chart taken by the Raman camera; (b) spectral transmission curves and stick spectra from N2, O2, H2, and H2O at 1500 K.

Data availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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