Survivability of the thermographic phosphors YAG:Pr and SMP:Sn in a premixed flame

Andreas Kopf (1, 2, 3) , Michele Bardi (1) , Eric Kohler (1) , Torsten Endres (2, 3) , Gilles Bruneaux (1) , Christof Schulz (2, 3)

1 IFPEN - IFP Energies nouvelles
2 Institute for Combustion and Gas dynamics, University of Duisburg-Essen
3 CeNIDE - Center for Nanointegration Duisburg-Essen

The survivability of two thermographic phosphors, YAG:Pr3+ and SMP:Sn2+ ((Sr,Mg)3(PO4)2:Sn2+), in a combustion environment is studied in the post-flame regime of a premixed propane/air flame. While the laser-induced luminescence of YAG:Pr3+ can be exploited for in situ temperature measurements in the exhaust gas above the flame, there is no in situ detectable luminescence for SMP:Sn2+ for any reaction conditions within the stability limits of the flame. The phosphor particles are recaptured above the flame and ex situ analyzed for chemical or structural changes using microscopic analysis (SEM/EDX) and x-ray diffraction. The microscopic analysis of post-flame YAG:Pr3+ does not show any alteration, whereas morphology and chemical composition of SMP:Sn2+ have been modified upon passing through the reaction zone, which is responsible for the loss of its luminescence properties.

Keywords: YAG:Pr; tin-activated strontium magnesium phosphate (SMP:Sn); survivability; phosphor thermometry; in situ combustion temperature imaging

Domains: Engineering Sciences [physics]

Andreas Kopf, Michele Bardi, Eric Kohler, Torsten Endres, Gilles Bruneaux, et al.. Survivability of the thermographic phosphors YAG:Pr and SMP:Sn in a premixed flame. Measurement Science and Technology, 2021, 32 (7), pp.074001. ⟨10.1088/1361-6501/abf57b⟩. ⟨hal-03248559⟩