Degradation of Optical Fibers at Carbon-Carbon Pyrolysis Temperatures
The value of having a sensor capable of monitoring the progress of carbon-carbon fabrication has been previously discussed and continues to be an attractive objective [1, 2]. Acoustic emission, when correlated with gas evolution and temperature profile, has been shown to give a strong indication of the internal stresses produced during pyrolysis and the path taken to achieve stress relief under varying process conditions. A challenging aspect of the process is the high temperature at which in situ sensors must function. Distributed physical proximity to the part under fabrication is critical to insure that the data reflects the material condition in real-time.
KeywordsAcoustic Emission Fresnel Reflection Coated Fiber Acrylate Coating Laser Precision
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- 1.J. R. Bulau, “AE Monitoring for Control of Carbon-Carbon Pyrolysis,” Proc. IEEE 1988 Ultrasonics Symposium, Oct. 2–5, 1988, Chicago, IL, Cat. 88CH2578–3, pp.1057–1063.Google Scholar
- 2.R. C. Addison, “Measurement of Carbon-Carbon Electrical Conductivity During Pyrolysis,” Review of Progress in QNDE Bowdoin College, Brunswick, ME, July 23–28, 1989.Google Scholar
- 3.R. O. Claus, et al, “Nondestructive Testing of Composite Materials by OTDR in Imbedded Optical Fibers,” Proc. 1985 SPIE Conference, Vol. 566, Fiber Optics and Laser Sensors III, 1985, pp. 243–248.Google Scholar
- 4.S. A. Kingsley, “Distributed Fibre Optic Sensors: An Overview,” Proc. 1985 SPIE Conference, Vol. 566, Fiber Optics and Laser Sensors III, 1985, p. 28.Google Scholar
- 5.J. S. Schoenwald, R. H. Rattner, and P. M. Beckham, “ Evaluation of an OTDR Microbend Distributed Sensor,” Proc. 1985 SPIE Conference, Vol. 566, Fiber Optics and Laser Sensors III, 1985, pp. 150–157.Google Scholar
- 6.E. H. Urruti, R. M. Hawk and P. E. Blaszyk, “Optical Fibers for Structural Sensing Application,” Proc. 1985 SPIE Conference, Vol. 566, Fiber Optics and Laser Sensors III, 1985, pp. 158–163.Google Scholar