Design, fabrication, and evaluation of an optical fiber sensor for tensile and compressive strain measurements via the use of white light interferometry

Tonguy Liu; David Brooks; Anthony R. Martin; Rodney Alan Badcock; Gerard Franklyn Fernando

doi:10.1117/12.240880

30 May 1996 Design, fabrication, and evaluation of an optical fiber sensor for tensile and compressive strain measurements via the use of white light interferometry

Tonguy Liu, David Brooks, Anthony R. Martin, Rodney Alan Badcock, Gerard Franklyn Fernando

Author Affiliations +

Proceedings Volume 2718, Smart Structures and Materials 1996: Smart Sensing, Processing, and Instrumentation; (1996) https://doi.org/10.1117/12.240880
Event: 1996 Symposium on Smart Structures and Materials, 1996, San Diego, CA, United States

Abstract

An embedded, intensity-based fiber optic sensor was previously designed and evaluated for strain monitoring in advanced fiber reinforced composites under dynamic loading conditions. The original sensor design involved the use of two multimode fibers, each with a cleaved end. These fibers were fitted into a glass capillary and were secured in position via a fusion splice at each end of the capillary. However, the effective operational strain range of this sensor design was limited primarily to tensile loading. In order to use this sensor under compressive loading regimes, it was necessary to develop a technique to construct the sensor with a known separation of the fiber end-faces. In effect, the sensor is an extrinsic Fabry-Perot interferometric sensor. The signal processing was based on a scanning monochromator. The feasibility of using the optical fiber sensor for tensile and compressive strain measurements was demonstrated. The sensor was also used to obtain in-situ stiffness reduction data during the fatigue testing of a cross-ply carbon fiber reinforced composite. An analysis of the relationship between detection sensitivity and sensor geometry is also presented.

Citation Download Citation

Tonguy Liu, David Brooks, Anthony R. Martin, Rodney Alan Badcock, and Gerard Franklyn Fernando "Design, fabrication, and evaluation of an optical fiber sensor for tensile and compressive strain measurements via the use of white light interferometry", Proc. SPIE 2718, Smart Structures and Materials 1996: Smart Sensing, Processing, and Instrumentation, (30 May 1996); https://doi.org/10.1117/12.240880

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