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Investigation of potential laser-induced heating effects when using thermographic phosphors for gas-phase thermometry

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Abstract

The spectral emission from thermographic phosphors in free flow and its dependence of laser energy per cross section area (laser fluence [J/cm2]) has been investigated. Temperature measurements in gaseous flows using thermographic phosphors require higher laser energy than measurements performed on surfaces, due to lower particle density. A troublesome systematic error associated with high fluences would be introduced if the excitation laser heats the particles. In the presented work, three different types of the thermographic phosphor BaMg2Al10O17:Eu (BAM) are investigated. Spectra of the phosphorescence are achieved for a range of laser fluences. The results show no indications of the laser heating the particles, making further development of phosphor thermography in free-flow applications feasible.

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Correspondence to J. Lindén.

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Lindén, J., Takada, N., Johansson, B. et al. Investigation of potential laser-induced heating effects when using thermographic phosphors for gas-phase thermometry. Appl. Phys. B 96, 237–240 (2009). https://doi.org/10.1007/s00340-009-3608-7

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  • DOI: https://doi.org/10.1007/s00340-009-3608-7

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