Abstract
The use of diode lasers for spatially resolved temperature imaging is demonstrated in low-pressure premixed methane–air flames using two-line atomic fluorescence of seeded indium atoms. This work features the advantages of using compact diode lasers as the excitation sources with the benefits of two-dimensional planar imaging, which is normally only performed with high-power pulsed lasers. A versatile and reliable seeding technique with minimal impact on flame properties is used to introduce indium atoms into the combustion environment for a wide range of flame equivalence ratios. A spatial resolution of around 210 µm for this calibration-free thermometry technique is achieved for three equivalence ratios at a pressure of 50 mbar in a laminar flat flame.
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The work was financially supported by the Swedish Energy Agency, Swedish Research Council (VR), Knut & Alice Wallenberg Foundation and European Research Council.
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Borggren, J., Burns, I.S., Sahlberg, AL. et al. Temperature imaging in low-pressure flames using diode laser two-line atomic fluorescence employing a novel indium seeding technique. Appl. Phys. B 122, 58 (2016). https://doi.org/10.1007/s00340-016-6329-8
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DOI: https://doi.org/10.1007/s00340-016-6329-8