Influence of the mechanical Environment on Optical Fiber based Sensor

Understanding possible limitation of some fiber optic sensor technologies


Summary

Understanding the detail interaction between a physical parameter along a long piece of fiber with the light propagation which will help to update the performance of some fiber sensors.


Research description

Optical sensor based on Fibers is a common tool used to measure many physical parameters such as strain, temperature or pressure. These external parameters change the fiber which then modulates the intensity, phase wavelength or transit time of the light.

Diverse types of fibers have been developed for specific applications: distributed sensing fiber (DSF) to measure dynamic strain along an optical fiber up to tens of km’s or Fiber Bragg Grating (FBG) to follow strain changes down to sub-microstrain. The trend is to embed the fiber inside a material such as composite materials. This has huge effect on the optical response of the fiber and usually deteriorate the performance of the technology.

The PhD work will focus on the understanding of the optical response of such fibers under non-uniform mechanical stress induced by the embedding of the fiber inside the structure (composite materials for example). Models, simulation, measurements and comparisons will be the main elements of the research. This will be carried out with FBG and DSF designs in mind. Thanks to the results obtained, it will drive new solutions for sensing applications.


Keywords

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