Grating-based optical fiber sensors for structual analysis

Vikram Bhatia; David K. Campbell; Marten J. de Vries; Daniel Sherr; Tiffanie D'Alberto; Vivek Arya; Richard O. Claus; Christopher Peter Nemarich

doi:10.1117/12.275760

6 June 1997 Grating-based optical fiber sensors for structual analysis

Vikram Bhatia, David K. Campbell, Marten J. de Vries, Daniel Sherr, Tiffanie D'Alberto, Vivek Arya, Richard O. Claus, Christopher Peter Nemarich

Author Affiliations +

Proceedings Volume 3042, Smart Structures and Materials 1997: Smart Sensing, Processing, and Instrumentation; (1997) https://doi.org/10.1117/12.275760
Event: Smart Structures and Materials '97, 1997, San Diego, CA, United States

Abstract

Long-period gratings have recently gained popularity as versatile optical fiber sensing elements that are simple and economical to fabricate and demodulate. Long-period gratings are periodic photoinduced structures in fiber cores that couple light from guided to cladding modes. We discuss the applications of these devices to strain measurements in high-performance materials and structures. Experimental results from a preliminary loading test carried out on a reinforcing-bar commonly used in civil structures are presented. The temperature cross-sensitivity of long-period grating-based strain sensors is analyzed and two methods to overcome this limitation are presented. We also demonstrate that strain-insensitive long-period gratings can be fabricated in standard optical fibers. The application of such gratings to temperature measurements in the presence of actively varying axial strain is discussed. Preliminary results indicate that long-period gratings hold tremendous potential for health monitoring of advanced materials and structures.

Citation Download Citation

Vikram Bhatia, David K. Campbell, Marten J. de Vries, Daniel Sherr, Tiffanie D'Alberto, Vivek Arya, Richard O. Claus, and Christopher Peter Nemarich "Grating-based optical fiber sensors for structual analysis", Proc. SPIE 3042, Smart Structures and Materials 1997: Smart Sensing, Processing, and Instrumentation, (6 June 1997); https://doi.org/10.1117/12.275760

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