Instrumentation for interrogating many-element fiber Bragg grating arrays

Charles G. Askins; Martin A. Putnam; E. Joseph Friebele

doi:10.1117/12.207681

20 April 1995 Instrumentation for interrogating many-element fiber Bragg grating arrays

Charles G. Askins, Martin A. Putnam, E. Joseph Friebele

Proceedings Volume 2444, Smart Structures and Materials 1995: Smart Sensing, Processing, and Instrumentation; (1995) https://doi.org/10.1117/12.207681
Event: Smart Structures and Materials '95, 1995, San Diego, CA, United States

Abstract

Fiber Bragg grating (FBG) arrays have provided the Smart Structures community with a powerful means for real-time and absolute point measurements of strain throughout extended structures. The mechanical properties of these optical fiber sensors uniquely suit them for unobtrusive and reliable incorporation into composite materials, while wavelength encoding of the measurand enables independent interrogation of many devices distributed along a single fiber. In view of recent progress towards practical and economical FBG array fabrication via the computer-controlled in-line writing process during fiber draw, there is a complementary need for economical instrumentation which makes efficient use of the reflected signals. This is an important issue, especially since the reflectivity of narrow-line, type I gratings produced during fiber draw is typically less than 5%.

Citation Download Citation

Charles G. Askins, Martin A. Putnam, and E. Joseph Friebele "Instrumentation for interrogating many-element fiber Bragg grating arrays", Proc. SPIE 2444, Smart Structures and Materials 1995: Smart Sensing, Processing, and Instrumentation, (20 April 1995); https://doi.org/10.1117/12.207681

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