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7 April 2008 Packaging of surface relief fiber Bragg gratings for harsh high temperature environments
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The Surface Relief Fiber Bragg Grating (SR-FBG) is a viable alternative to the thermocouple for high temperature measurements in industry. To fabricate the SR-FBG we etch a grating into the flat surface of an elliptical-core D-fiber. At high temperature (1000 °C) the optical fiber becomes brittle. To overcome brittleness we thread the fiber through a preheated 0.020 inch diameter stainless steel tube. We insert the small tube into a larger one with a diameter of 0.125 inches. The smaller tube rests on ceramic inserts to prevent contact with the large tube. The end of the D-fiber is fitted with a standard fiber optic connecter. With this packaging scheme we conduct a series of test at high temperature. The sensor is robust with no power loss or Bragg wavelength shift, even after heating for 24 consecutive hours.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jonathan D. Young, Tyson L. Lowder, Richard H. Selfridge, and Stephen M. Schultz "Packaging of surface relief fiber Bragg gratings for harsh high temperature environments", Proc. SPIE 6933, Smart Sensor Phenomena, Technology, Networks, and Systems 2008, 693308 (7 April 2008);

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