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Molecular Sensors Temperature Sensitive Paint

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Presentation on theme: "Molecular Sensors Temperature Sensitive Paint"— Presentation transcript:

1 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 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 Luminescent Molecule Excitation Quantitative Heat Flux Lamp LED CCD camera Feature Detection -Transition -Vortices -Separation 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 Luminescent Paint (TSP/PSP)
Data Processing Iref/I P/Pref calibration Acquisition photodetector long-pass filter Iref/I P/Pref Excitation short-pass filter excitation source surface map low cost easy to apply coated model

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

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

17 Temperature Sensitive Paint TSP
Same or similar Luminophore as in PSP Oxygen impermeable binder

18 Global Surface Temperature Measurements
Toolbox 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 TSP Time Response Laser Pulse Heating c specific heat paint thickness
 density of polymer c specific heat paint thickness h convection heat transfer coefficient

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 Detection Low 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



34 Mach-6 Quiet Tunnel

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

36 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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