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

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.

Citation
Yu, T., Yang, C., Sharma, P., AlRamadan, A. S., & Magnotti, G. (2022). Fiber-bundle-based 2D Raman and Rayleigh imaging for major species and temperature measurement in laminar flames. Optics Letters, 47(15), 3764. https://doi.org/10.1364/ol.467713

Acknowledgements
Saudi Aramco Research and Development Center FUELCOM3 program under Master Research Agreement Number 6600024505/01, and Clean Combustion Research Center, KAUST.

Publisher
Optica Publishing Group

Journal
Optics Letters

DOI
10.1364/OL.467713

Additional Links
https://opg.optica.org/abstract.cfm?URI=ol-47-15-3764

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