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

Borggren, Jesper and Burns, Iain S. and Sahlberg, Anna-Lena and Aldén, Marcus and Li, Zhongshan (2016) Temperature imaging in low pressure flames using diode laser two-line atomic fluorescence employing a novel indium seeding technique. Applied Physics B: Lasers and Optics, 122 (3). ISSN 0946-2171

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    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.