新型光纤耦合荧光粉测温仪在激光粉末床熔融过程中的演示.pdf

1、RapidTech|2025Demonstration of novel fiber-coupled phosphor thermometry in a laser powder bed fusion processHanna SchnrathAndr Mller,Jan Wegner,Torsten Endres,Stefan KleszczynskiRapidTech|2025Light emission distinct from incandescence/heatPrinciple:electron excitationSorted by trigger:Bio-Luminescen

2、ceChemi-LuminescencePhoto-LuminescenceFundamentals2Source:Gnter Hentschel(2019;)21.05.2025“Some things,though they are not in their nature fire,nor any species of fire,yet seem to produce light”AristotleLuminescenceRapidTech|2025Fundamentals31.Excitation by external light source2.Energy release,retu

3、rn to ground stateRadiative:Fluorescence:10-8 snon-radiative:vibrationalother21.05.2025Jablonski energy-level diagram:A.H.Khalid and K.Kontis,Thermographic Phosphors for High Temperature Measurements:Principles,Current State of the Art and Recent Applications“(2008)PhosphorescenceRapidTech|2025Funda

4、mentals4Excitation,then:Emission,radiant:photon emittance(C-D)Relaxation,non-radiant:vibration or other(B-C,E-D)At higher temperature:Increased intensity higher probability for non-radiant return to ground state decreased lifetime21.05.2025A.H.Khalid and K.Kontis,Thermographic Phosphors for High Tem

5、perature Measurements:Principles,Current State of the Art and Recent Applications“(2008)Configuration co-ordinate diagramTemperature DependencyRapidTech|2025Fundamentals5S.W.Allison;G.T.Gillies,“Remote thermometry with thermographic phosphors”(1997)21.05.2025 Temperature recording possible after cal

6、ibrationLifetime:=1/Decay:Thermographic phosphor:inorganic host doped with rare-earth elements or transition-metalsCurrent use cases:gas turbines,droplet and spray thermographyIntensity-basedLifetime-basedPhosphor ThermometryRapidTech|2025Proof of Principle:In-Situ Phosphor ThermometryMotivation621.