Amplitude-modulated laser-driven fiber-optic RF interferometric strain sensor

Jeffrey S. Schoenwald

doi:10.1117/12.43830

1 July 1991 Amplitude-modulated laser-driven fiber-optic RF interferometric strain sensor

Jeffrey S. Schoenwald

Proceedings Volume 1418, Laser Diode Technology and Applications III; (1991) https://doi.org/10.1117/12.43830
Event: Optics, Electro-Optics, and Laser Applications in Science and Engineering, 1991, Los Angeles, CA, United States

Abstract

A new fiber optic sensor for use in flexible structures is reported. The sensor is based on an extension of Rogowski's design, in which the laser-driven optical beam in the fiber is modulated at radio frequency and strain is detected by a shift in the phase delay as the fiber dimension is strained with the structure. This sensor -- FORISS -- differs in that it consists of an embedded closed loop of fiber coupled to a laser/detector/fiber optic delay line circuit through a 2 X 2 coupler. The closed loop has the characteristics of a Fabry-Perot cavity operating at radio frequency wavelengths within the fiber. A parametric model of the sensor that enables both physical characterization of prototype sensors and insights which guide design optimization of the sensor is described. Experiments were performed on fiber- embedded composite specimens tension-stressed to failure at 26 kpsi and 7400 microstrains. The sensor survived to the point of coupon failure. The data indicates that the sensor possesses the properties predicted by the theory.

Citation Download Citation

Jeffrey S. Schoenwald "Amplitude-modulated laser-driven fiber-optic RF interferometric strain sensor", Proc. SPIE 1418, Laser Diode Technology and Applications III, (1 July 1991); https://doi.org/10.1117/12.43830

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