Novel Fiber Optic Sensors: from 2D Surface Strain Mapping to Picoliter-Volume Fluid Monitoring

  • Jin Huang

Student thesis: Master's Thesis

Abstract

This master thesis presents two projects on fiber optic sensors: a 2D distributed surface strain sensing scheme and a Fabry-Pérot cavity picoliter-volume sensor. In the first part of this work, a 2D strain distribution map of a deformed surface is synthesized from 1D strain information obtained through Rayleigh backscatter in a single-mode optical fiber. Finite element analysis simulations are performed to provide reference results, and experimental demonstration of the scheme is performed on a composite fiberglass board. The simulations and the experiments show that the 2D distributed strain sensing scheme based on Rayleigh backscatter is capable of providing detailed mapping of the directional surface strain distribution of the test board, with a spatial resolution of 1 mm2. In the second part of this work, a microscale Fabry-Pérot cavity is fabricated on a standard telecom single-mode fiber using focused ion beam milling. Finite difference time-domain simulations are performed to provide a numerical interpretation of the structure. Experiments are then conducted in order to test the performance of the fabricated sensor head. All together, the fabrication process, simulations and optical measurements demonstrate that the Fabry-Pérot cavity sensor is an excellent candidate to be used as a small volume reversible chemical fluid/gas sensor, with a sensing volume of about 2 picoliters. In summary, this thesis explores two different areas of fiber optic sensors and delivers promising results for future work.
Date of AwardDec 2013
Original languageAmerican English
SupervisorMarcus Dahlem (Supervisor)

Keywords

  • Fiber Optic Sensors
  • 2D Distributed Surface Strain Sensing
  • Fabry-Pérot Cavity Picoliter-Volume
  • 2D Strain Distribution Map.

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