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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Jang, Sei-Hum
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Topics
Publications (10/10 displayed)
- 2019NDE THERMAL MAPPING USING THERMOCHROMIC SENSOR FILMS
- 2018Thermochromic Polymer Film Sensors for Detection of Incipient Thermal Damage in Carbon Fiber–Epoxy Compositescitations
- 2017Detection of incipient thermal damage in carbon fiber-epoxy composites using fluorescent thermal sensor films
- 2016Time temperature indicator film for monitoring composite repair adhesive cure using thermochromic fluorescent molecules
- 2014Time-temperature indicator for evaluating incipient thermal damage of CFRP
- 2014Damage detection for aerospace composites using matrix resins functionalized with fluorescent probe molecules
- 2013Influence of matrix resin mechanical properties on mechanochromic fluorescent damage probe response
- 2013Thermal damage detection of CFRP using coatings doped with fluorescent probes
- 2005Exceptional electro-optic properties through molecular design and controlled self-assemblycitations
- 2005Acentric lattice electro-optic materials by rational designcitations
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document
NDE THERMAL MAPPING USING THERMOCHROMIC SENSOR FILMS
Abstract
Mapping thermal exposure of components over large areas without the added complexity of wired thermocouples is a step forward in an industry where parts are increasing in size and complexity. We have developed polymer films that use thermochromic probe molecules to more easily determine the thermal exposure over large areas. Following a first-order kinetic reaction model, the films show dramatic color and fluorescence changes related to the time and temperature of a thermal exposure. Sensor molecules have been developed which transition from a colorless, non-fluorescent state to a colorful, highly fluorescent state when heated. These molecules are dispersed in removable polymer films and can be attached to components to act as large area sensors. Our group has created a sensor system spanning three temperature ranges: low temperature (50<sup>0</sup>C-100<sup>0</sup>C), medium temperature (100<sup>0</sup>C-150<sup>0</sup>C), and high temperature (150<sup>0</sup>C-200<sup>0</sup>C). By combining two or more of these films, we can determine the time-temperature exposure based on quantitative data collected through spectroscopy. If either an estimated time or temperature is known for the exposure, it is possible to determine the other variable based on a single film. Upon thermal exposure, the fluorescent molecules within the film are activated and cause a color change and fluorescence which can be evaluated qualitatively by visual inspection and measured quantitatively using spectroscopy. In our work, we studied both absorbance of the films and fluorescence intensities under ultraviolet light. Based on our data, we were able to determine the activation energies of the probe molecules. Theoretical look-up charts generated by determining activation energies of the probe molecules allow quick and efficient determinations of time-temperature exposure. There are many potential uses of these thermal exposure mapping films, including detection of incipient thermal damage of composite materials for efficient part servicing, ensuring appropriate curing conditions for composite repairs, and validation of thermal models. © 2019 by Ever J. Barbero. Published by CAMX - The Composites and Advanced Materials Expo.