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Optical Fiber Methods for Autoclave and Epoxy Cure Monitoring

  • B. Zimmermann
  • C. DiFrancia
  • K. Murphy
  • A. Vengsarkar
  • R. Claus
Chapter
Part of the Review of Progress in Quantitative Nondestructive Evaluation book series

Abstract

The fabrication process of recently developed advanced technology hybrid structures has placed a demand on methods to monitor the state of cure of resins and epoxies commonly used in composite materials. Such monitoring allows in-situ process control insuring homogeneous structural integrity. Furthermore, fabrication costs can be reduced by avoiding the need to over cure“ the composite specimens. Existing techniques such as differential scanning calorimetry (DSC), optical spectroscopy, and dielectric spectroscopy lack the in-situ capabilities required to monitor localized cure state. Other methods, including ultrasonic wave monitoring, are absolute in nature, require frequent calibration, and involve complex measurement systems for monitoring localized cure state [1–3]. We propose to expand upon a principle recently suggested by M. A. Afromowitz, in which optical waveguides made out of the hybrid resin material itself are embedded within the specimen to be monitored [4]. Such implementation exploits some of the advantages of fiber optic sensing techniques, while avoiding the incorporation of “foreign materials” which might cause inhomogeneities in the composite structure.

Keywords

Interaction Length Epoxy Cure Mode Epoxy Waveguide Core Fiber Optic Polymer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    R. L. Levy, “A New Fiber Optic Sensor for Monitoring the Composite Curing Process,” Poly. Mat. Sci. and Eng., Vol. 54, 1986, pp. 321–323.Google Scholar
  2. 2.
    S. D. Senturia et al, “In-Situ Measurements of the Properties of Curing Systems with Microdielectrometry,” J. Adhesion, Vol. 15, 1982, pp. 69–90.CrossRefGoogle Scholar
  3. 3.
    B. Franconi et al, “Cure Monitoring for Polymer Matrix Composites,” Materials Characterization for Systems Performance and Reliability, J. W. McCauly, V. Weis, Plenum Press, NY 1986, pp. 275–291.CrossRefGoogle Scholar
  4. 4.
    M. A. Afromowitz, “Fiber Optic Polymer Cure Sensor,” J. of Lightwave Tech., Vol. 6, No. 10, Oct. 1988, pp. 1591–1594.CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • B. Zimmermann
    • 1
  • C. DiFrancia
    • 1
  • K. Murphy
    • 1
  • A. Vengsarkar
    • 1
  • R. Claus
    • 1
  1. 1.Fiber and Electro-Optics Research CenterVirginia Polytechnic Institute and State UniversityBlacksburgUSA

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