Mr. Timothy J. Bencic Profile

Timothy J. Bencic

at NASA Glenn Research Ctr

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Proceedings Article | 9 May 2005 Paper

Smart coatings for health monitoring and nondestructive evaluation

Timothy Bencic, Jeffrey Eldridge

Proceedings Volume 5770, (2005) https://doi.org/10.1117/12.606240

KEYWORDS: Sensors, Cameras, Nondestructive evaluation, Imaging systems, Ultraviolet radiation, Luminescence, Thermography, Temperature metrology, Signal detection, Optical filters

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Luminescent coatings applications have been increased dramatically over the last decade as imaging capacities have advanced. These coatings have been used to monitor surface temperature and air pressure (oxygen sensing) in testing facilities around the world. Through the commercial suppliers of these coatings, custom assembled hardware systems and especially data reduction and analysis software, the use of smart luminescent coatings are starting to find their way in to inspection monitoring and nondestructive evaluation testing. The use of a temperature sensitive paint for example, can be a potential replacement for infrared imaging where IR techniques are limited due to access, reflections and complex geometries. Detection of the luminescent signal can use simple intensity ratio methods with synchronized pulsing systems to capture frequency responses in imaging applications. Time or frequency methods allow signals to be detected in the presence of high background noise that allow measurements that were previously unobtainable. This paper describes general luminescent sensors, detection methods and examples of coatings that are applied over test examples or embedded in materials to measure or monitor the health of a specimen.

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