Interrogating adhesion using fiber Bragg grating sensing technology

Roger D. Rasberry; Garth D. Rohr; William K. Miller; Eric Udd; Noah T. Blach; Ryan A. Davis; Walter R. Olson; David Calkins; Allen R. Roach; David S. Walsh; James R. McElhanon

doi:10.1117/12.2177701

13 May 2015 Interrogating adhesion using fiber Bragg grating sensing technology

Roger D. Rasberry, Garth D. Rohr, William K. Miller, Eric Udd, Noah T. Blach, Ryan A. Davis, Walter R. Olson, David Calkins, Allen R. Roach, David S. Walsh, James R. McElhanon

Author Affiliations +

Proceedings Volume 9480, Fiber Optic Sensors and Applications XII; 948007 (2015) https://doi.org/10.1117/12.2177701
Event: SPIE Sensing Technology + Applications, 2015, Baltimore, MD, United States

Abstract

The assurance of the integrity of adhesive bonding at substrate interfaces is paramount to the longevity and sustainability of encapsulated components. Unfortunately, it is often difficult to non-destructively evaluate these materials to determine the adequacy of bonding after manufacturing and then later in service. A particularly difficult problem in this regard is the reliable detection/monitoring of regions of weak bonding that may result from poor adhesion or poor cohesive strength, or degradation in service. One promising and perhaps less explored avenue we have recently begun to investigate for this purpose centers on the use of (chirped) fiber Bragg grating sensing technology. In this scenario, a grating is patterned into a fiber optic such that a (broadband) spectral reflectance is observed. The sensor is highly sensitive to local and uniform changes across the length of the grating. Initial efforts to evaluate this approach for measuring adhesive bonding defects at substrate interfaces are discussed. Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-AC04-94AL85000.

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Roger D. Rasberry, Garth D. Rohr, William K. Miller, Eric Udd, Noah T. Blach, Ryan A. Davis, Walter R. Olson, David Calkins, Allen R. Roach, David S. Walsh, and James R. McElhanon "Interrogating adhesion using fiber Bragg grating sensing technology", Proc. SPIE 9480, Fiber Optic Sensors and Applications XII, 948007 (13 May 2015); https://doi.org/10.1117/12.2177701

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KEYWORDS

Fiber Bragg gratings

Epoxies

Interfaces

Aluminum

Fiber optics sensors

Sensors

Adhesives

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