Abstract
In this article, a novel miniature Fabry-Perot twist/rotation sensor using a four core fiber and quadruple interferometer setup is presented and demonstrated. Detailed sensor modeling, analytical evaluation and test measurement assessment were conducted in this contribution. The sensor structure comprises a single lead-in multicore fiber, which has four eccentrically positioned cores, a special asymmetrical microstructure, and an inline semi-reflective mirror, all packed in a glass capillary housing. A four core fiber positioned in front of a special asymmetrical microstructure and the inline semi reflective mirror defines four Fabry-Perot interferometers. Rotation of the sensors’ asymmetrical microstructure around the axis of the in-line four core fibers´ modulates the path lengths of all four interferometers simultaneously. Proper processing of path length changes of all four interferometers allows for unambiguous and temperature independent determination of the sensor’s rotation angle.
Highlights
Over the last few decades, fiber optic sensors have become widely used in different applications, due to their distinctive and well known advantages, such as lightweight design, small size, immunity to electromagnetic interference (EMI) and high sensitivity
There have been several investigated approaches that depend either on measurements of circular birefringence [1,2,3,4] or linear birefringence [5,6,7,8,9,10,11,12,13], changes in twisted fibers, systems that exploit different effects related to Fiber Bragg Gratings (FBGs) [14,15,16,17], tilted FBGs [18,19,20,21,22] and Long
Measurements of the optical path length changes for each FP interferometer were obtained by phase-tracking of characteristic components with Inverse Discrete Fourier Transform (IDFT) of the sensor’s Back-Reflected Optical Spectrum (BROS) [44,45,46]
Summary
Over the last few decades, fiber optic sensors have become widely used in different applications, due to their distinctive and well known advantages, such as lightweight design, small size, immunity to electromagnetic interference (EMI) and high sensitivity. There have been several investigated approaches that depend either on measurements of circular birefringence [1,2,3,4] or linear birefringence [5,6,7,8,9,10,11,12,13], changes in twisted fibers, systems that exploit different effects related to Fiber Bragg Gratings (FBGs) [14,15,16,17], tilted FBGs [18,19,20,21,22] and Long. This paper presents a compact twist/rotation Fabry Perot (FP) sensor based (FP) sensor based on a four-core fiber. The sensor introduces an asymmetrical microstructure that modulates path length modulates path length with respect to the twist/rotation of the sensor structure.
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