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Determination of Glass Transition Temperature (Tg) of Adhesive-Based Optical Fiber Components by In-Situ Bragg Grating Strain Sensing

[+] Author Affiliations
Keita Broadwater, Donald Barker, Yubing Yang

University of Maryland, College Park, MD

Paper No. IMECE2002-39506, pp. 241-247; 7 pages
doi:10.1115/IMECE2002-39506
From:
  • ASME 2002 International Mechanical Engineering Congress and Exposition
  • Electronic and Photonic Packaging, Electrical Systems Design and Photonics, and Nanotechnology
  • New Orleans, Louisiana, USA, November 17–22, 2002
  • Conference Sponsors: Electronic and Photonic Packaging Division
  • ISBN: 0-7918-3648-7 | eISBN: 0-7918-1691-5, 0-7918-1692-3, 0-7918-1693-1
  • Copyright © 2002 by ASME

abstract

This paper presents an in-situ evaluation technique that can be used to measure the Tg of thin layers. The studies presented in this paper were conducted on fiber optic connectors, but the results can be applied in general to ferrule-based components that use epoxy adhesives. This paper demonstrates how a strain sensor can theoretically detect the glass transition response of the epoxy material using a simple mechanics of materials approach. Several experimental results are presented showing that there is adequate sensor discrimination to detect the glass transition region. The technique also clearly showed residual curing and small changes in the Tg of the epoxy as the ferrule samples were subjected to multiple thermal cycles. The experimental results also demonstrate that the measured Tg of the epoxy in thin layers is different that that measured in bulk samples.

Copyright © 2002 by ASME

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