Fiber Bragg Gratings in Temperature and Strain Sensors
ROYAL INSTITUE OF TECHNOLOGY
Laser Physics Group
Department of Applied Physics
SA104X Degree Project in Engineering Physics, First Cycle
Fiber Bragg Gratings
in Temperature and Strain Sensors
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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