Mr. Thomas Alt Profile

Thomas Alt

at Fraunhofer IZM

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Proceedings Article | 1 September 2004 Paper

Structural health monitoring by embedded fiber Bragg gratings

Thomas Alt, Kathrin Badstuebner, Bernd Michel, A. Ansorge

Proceedings Volume 5459, (2004) https://doi.org/10.1117/12.544089

KEYWORDS: Fiber Bragg gratings, Sensors, Polymers, Structural health monitoring, Temperature metrology, Mechatronics, Packaging, Phase only filters, Stereolithography, Fiber optics sensors

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At Fraunhofer Institute for Reliability and Microintegration IZM, Fiber Bragg Gratings (FBG) are used for online measurement of mechanical deformations and temperature changes within electronic packaging and mechatronic systems. Encapsulation processes with rapid prototyping materials like stereolithography resin and vacuum casting polymers are monitored, as well as high volume production processes like Reactive Injection Molding (RIM). This paper discusses the effects that occur when the geometrical and mechanical properties of the measured object are comparable to the sensing system and when the fiber optic sensor is significantly influencing the measurement. Package reliability in electronics is intensively studied at our institute [1] and this paper will evaluate the ability of FBG to detect structural changes like cracks and delaminations within electronics. By embedding the fibers directly into the polymer packaging the sensor can be used for continuous lifetime monitoring of the system, starting with real-time cure monitoring during production processes and ending with structural health monitoring during product lifetime and quality testing.

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