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Purdue University - School of Aeronautics and Astronautics Molecular Sensors Temperature Sensitive Paint John Sullivan Professor – School of Aeronautics.

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Presentation on theme: "Purdue University - School of Aeronautics and Astronautics Molecular Sensors Temperature Sensitive Paint John Sullivan Professor – School of Aeronautics."— Presentation transcript:

1 Purdue University - School of Aeronautics and Astronautics Molecular Sensors Temperature Sensitive Paint John Sullivan Professor – School of Aeronautics and Astronautics Director - Center for Advanced Manufacturing Purdue University Special Government Employee – NASA West Lafayette, IN Telephone (765) Fax (765)

2 Purdue University - School of Aeronautics and Astronautics Objective Measure temperature distribution and heat transfer distribution on a hydraulic experiment at Beihang University in the next three weeks.

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

4 Purdue University - School of Aeronautics and Astronautics TSP -Temperature Sensitive Paint PSP - Pressure Sensitive Paint 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

5 Purdue University - School of Aeronautics and Astronautics 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 Purdue University - School of Aeronautics and Astronautics Luminescent Paint (TSP/PSP) coated model Excitation short-pass filter excitation source Acquisition photodetector long-pass filter I ref /I P/P ref Data Processing I ref /I P/P ref calibration surface map low cost easy to apply

7 Purdue University - School of Aeronautics and Astronautics 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 Purdue University - School of Aeronautics and Astronautics Basic Photophysics

9 Purdue University - School of Aeronautics and Astronautics Jablonski Diagram

10 Purdue University - School of Aeronautics and Astronautics Data Reduction Methods

11 Purdue University - School of Aeronautics and Astronautics Data Reduction Methods Intensity Reference Multi-luminophore Paint Time Based Methods

12 Purdue University - School of Aeronautics and Astronautics Intensity Reference Wind Off / Wind On Corrects for non-uniform model motion, nonuniform concentration

13 Purdue University - School of Aeronautics and Astronautics Multi-luminophore Paint Luminescent molecules with different pressure and temperature sensitivities, overlapping excitations and different emission wavelengths

14 Purdue University - School of Aeronautics and Astronautics Time Based Methods Direct Decay Phase Based

15 Purdue University - School of Aeronautics and Astronautics Direct Decay Modulated Light Source –Pulse, Sine wave, square wave Point Systems Camera Systems with image intensifier Time Intensity

16 Purdue University - School of Aeronautics and Astronautics Phase Based Lock-in Amplifier FLIM (Fluorescent Lifetime Imaging Method) tan( )=

17 Purdue University - School of Aeronautics and Astronautics Temperature Sensitive Paint TSP Same or similar Luminophore as in PSP Oxygen impermeable binder

18 Purdue University - School of Aeronautics and Astronautics Temperature Sensitive Paint Thermographic Phosphors Infrared Camera Temperature Sensitive Liquid Crystals Array of Thermocouples Global Surface Temperature Measurements Toolbox

19 Purdue University - School of Aeronautics and Astronautics Temperature Sensitive Paint Surface Temperature –Correction for Pressure Sensitive Paint Transition Detection Quantitative Heat Transfer Shear Stress - Heat transfer Analogy

20 Purdue University - School of Aeronautics and Astronautics Temperature Sensitive Paint Calibrations

21 Purdue University - School of Aeronautics and Astronautics TSP Time Response Laser Pulse Heating density of polymer c specific heat paint thickness h convection heat transfer coefficient

22 Purdue University - School of Aeronautics and Astronautics Ruthenium based TSP tris(2,2-bipyridyl)ruthenium - Ru(bpy) Excitation and Emission Spectrum of a Ruthenium Based Paint

23 Purdue University - School of Aeronautics and Astronautics EuTTA based TSP Europium III Thenoyltrifluoroacetonate EuTTA Excitation Spectrum Emission Spectrum

24 Purdue University - School of Aeronautics and Astronautics EuTTA in Model Airplane Dope

25 Purdue University - School of Aeronautics and Astronautics 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 Purdue University - School of Aeronautics and Astronautics Transition Detection Low Speed TSP –EuTTA in dope Wing heated with photographic spot lamps to ~20 C above ambient 8 bit Camera

27 Purdue University - School of Aeronautics and Astronautics Raw Image (false color) Results Low Speed Transition

28 Purdue University - School of Aeronautics and Astronautics Quantitative Heat Transfer

29 Purdue University - School of Aeronautics and Astronautics Heat Transfer Data Reduction 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 1 Method 2

30 Purdue University - School of Aeronautics and Astronautics Tunnel #9 M=10 Run time ~1.0 sec 1.5 meter Diameter

31 Purdue University - School of Aeronautics and Astronautics TSP - EuTTA in dope Metal model Insulating Layer – mylar film (model airplane monokote) 50 microns thick Raw Image

32 Purdue University - School of Aeronautics and Astronautics

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34 Mach-6 Quiet Tunnel

35 National Aeronautics and Space Administration 35 HIFiRE-5 Model Quiet Flow, α=0 Re = 2.6*10 6 /ft

36 Purdue University - School of Aeronautics and Astronautics Temperature profile of machining acquired with TSP sensor (Rubpy) Temperature profiles from TSP measurement of grinding stainless steel at spark-out condition TSP Measurements of Material Temperature


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