Temperature imaging in low pressure flames using diode laser two-line atomic fluorescence employing a novel indium seeding technique

Jesper Borggren, Iain S. Burns, Anna-Lena Sahlberg, Marcus Aldén, Zhongshan Li

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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.
Original languageEnglish
Article number58
Number of pages8
JournalApplied Physics B: Lasers and Optics
Issue number3
Publication statusPublished - 11 Mar 2016


  • TMIn seeding
  • two-line atomic fluorescence
  • temperature
  • low pressure flame
  • diode lasers
  • imaging

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