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Molecular Sensors Temperature Sensitive Paint

Molecular Sensors Temperature Sensitive Paint. John Sullivan Professor – School of Aeronautics and Astronautics Director - Center for Advanced Manufacturing Purdue University Special Government Employee – NASA

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Molecular Sensors Temperature Sensitive Paint

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  1. Molecular SensorsTemperature Sensitive Paint John Sullivan Professor – School of Aeronautics and Astronautics Director - Center for Advanced ManufacturingPurdue University Special Government Employee – NASA West Lafayette, IN 47907-2022Telephone (765)494-1279Fax       (765)496-1180john.p.sullivan.1@purdue.edu

  2. Objective • Measure temperature distribution and heat transfer distribution on a hydraulic experiment at Beihang University in the next three weeks.

  3. Temperature Sensitive Paint Emission Excitation Luminescent Molecule Quantitative Heat Flux CCD camera Feature Detection -Transition -Vortices -Separation Lamp LED Mach 10 –Tunnel 9 High-mass planetary probes are affected by transition Laminar flow results in 2-8 times less aeroheating

  4. Photo-physical process: -absorb a photon -transition to excited state -Oxygen quenching (PSP) or thermal quenching (TSP) => Pressure and/or temperature dependent luminescent intensity and luminescent lifetime TSP -Temperature Sensitive Paint PSP - Pressure Sensitive Paint

  5. Temperature Sensitive Paint • High temperature causes non-radiative decay • “thermal quenching” • Obeys Arrhenius relation: • For limited temp. range • Similar molecules to • PSP, but in oxygen • impermeable binder

  6. Acquisition Data Processing P/Pref Iref/I calibration Iref/I P/Pref photodetector Excitation excitation source long-pass filter short-pass filter surface map low cost easy to apply coated model Luminescent Paint (TSP/PSP)

  7. Current State of the Art of PSP/TSP • Temperature Sensitive Paint • –T= -196 C to 200 C M=.01 to 10 • –Accuracy 1 Degree Centigrade Resolution <. 01 C • –Time Response 1 sec Typical (<1 ms demonstrated) • Pressure Sensitive Paint • –P=.001 to 2 atm M=.05 to 5 • –Accuracy 1.0 mbar Resolution .5 mbar • –Time response .5 sec Typical • ( 1 microsec demonstrated)

  8. Basic Photophysics

  9. Jablonski Diagram

  10. Data Reduction Methods

  11. Data Reduction Methods • Intensity Reference • Multi-luminophore Paint • Time Based Methods

  12. Intensity Reference • Wind Off / Wind On • Corrects for non-uniform model motion, nonuniform concentration

  13. Multi-luminophore Paint • Luminescent molecules with different pressure and temperature sensitivities, overlapping excitations and different emission wavelengths

  14. Time Based Methods • Direct Decay • Phase Based

  15. Intensity Time Direct Decay • Modulated Light Source • Pulse, Sine wave, square wave • Point Systems • Camera Systems with image intensifier

  16. tan()= Phase Based • Lock-in Amplifier • FLIM (Fluorescent Lifetime Imaging Method)

  17. Temperature Sensitive PaintTSP Same or similar Luminophore as in PSP Oxygen impermeable binder

  18. Toolbox Global Surface Temperature Measurements Temperature Sensitive Paint Thermographic Phosphors Infrared Camera Temperature Sensitive Liquid Crystals Array of Thermocouples

  19. Temperature Sensitive Paint • Surface Temperature • Correction for Pressure Sensitive Paint • Transition Detection • Quantitative Heat Transfer • Shear Stress - Heat transfer Analogy

  20. Temperature Sensitive Paint Calibrations

  21.  density of polymer c specific heat paint thickness h convection heat transfer coefficient TSP Time Response Laser Pulse Heating

  22. Ruthenium based TSP tris(2,2’-bipyridyl)ruthenium - Ru(bpy) Excitation and Emission Spectrum of a Ruthenium Based Paint

  23. EuTTA based TSP Europium III Thenoyltrifluoroacetonate EuTTA Emission Spectrum Excitation Spectrum

  24. EuTTA in Model Airplane Dope

  25. Applications Temperature Sensitive Paint (TSP) Transition Detection Low Speed Cryogenic Wind Tunnel Quantitative Heat Transfer Camera Based – M=10 Scanning System Laser Spot Heating

  26. Transition DetectionLow Speed TSP –EuTTA in dope Wing heated with photographic spot lamps to ~20 C above ambient 8 bit Camera

  27. Results Low Speed Transition Raw Image (false color)

  28. Quantitative Heat Transfer

  29. Heat Transfer Data Reduction Method 1 • Model make out of Thermally Insulating material • Measure • Match the temperature to analytic solution for a semi-infinite body (Cook-Felderman) • Make Model out of a Conductor with a thin insulator on the surface Method 2

  30. Tunnel #9 M=10 Run time ~1.0 sec 1.5 meter Diameter

  31. TSP - EuTTA in dope Metal model Insulating Layer – mylar film (model airplane monokote) 50 microns thick Raw Image

  32. Mach-6 Quiet Tunnel

  33. HIFiRE-5 Model Quiet Flow, α=0 Re = 2.6*106 /ft

  34. TSP Measurements of Material Temperature Temperature profiles from TSP measurement of grinding stainless steel at spark-out condition Temperature profile of machining acquired with TSP sensor (Rubpy)

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