A Novel Microbending Hetero-Core Fiber Optic Sensor for Force and Location Sensing with Applications to Home Security


LİKOĞLU S., ALEMDAR K., FİDANBOYLU K. , TOKER O.

SPIE Smart Structures (NDE 2014), SAN DIEGO, CALIFORNIA, United States Of America, 9 - 13 March 2014, vol.9062, pp.906201-9062011 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 9062
  • Doi Number: 10.1117/12.2046774
  • City: SAN DIEGO, CALIFORNIA
  • Country: United States Of America
  • Page Numbers: pp.906201-9062011

Abstract

In this paper, a novel design of microbending hetero-core fiber optic sensor for force and location sensing is proposed, and potential applications to home security systems are discussed. Force and location detection is done by using two different microbending fiber optic sensors. The main idea is, we have two unknowns, two different fibers, and two simultaneous intensity measurements. In order to demonstrate the location detection of the microbending fiber optic sensor, changes in the light intensity are examined with different force locations and forces magnitudes on the microbending fiber optic sensor. Several experiments are performed for different microbend sensors by varying periodicity, corrugation size, thickness of plates, and the configuration of optical fiber type. All experiments were done on a microbending sensor constructed from 62,5/125 mu m multimode fibers and a microbending sensor constructed from 62,5-50-62,5/125 mu m hetero-core fiber. For each case, the output light intensity is measured as a function of applied force. The characteristics of hysteresis, repeatability and location comparison are examined for each combination of microbending fiber optic sensors. Experimental results show that the sensitivity of the proposed microbending sensor constructed using hetero-core optical fiber having loops is the highest.