Fiber Bragg Gratings in Temperature and Strain Sensors

University essay from KTH/Tillämpad fysik

Author: Ilian Häggmark; [2014]

Keywords: ;

Abstract:

ROYAL INSTITUE OF TECHNOLOGY

Abstract

Laser Physics Group

Department of Applied Physics

SA104X Degree Project in Engineering Physics, First Cycle

Fiber Bragg Gratings

in Temperature and Strain Sensors

by Ilian

Haggmark

Supervisor: Michael

Fokine

A Fiber Bragg Grating (FBG) is a periodic variation of the refractive index in an optic

ber. It works as a wavelength selective lter and is used in several dierent applications

such as telecommunication and sensor technology. Fiber sensors are based on a simple

principle; the ber is aected by strain, temperature etc. due to which the selection

of wavelengths in the FBG change. With an optical spectrum analyzer the changes in

wavelength reection can be observed and converted to the physical quantity measured.

In this thesis the properties of FBGs used in temperature and strain sensors are tested.

Experiments to improve the precision of the sensors by embedding FBGs in metal are

also carried out.

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