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Fiber Bragg Gratings in Temperature and Strain Sensors
KTH, School of Engineering Sciences (SCI), Applied Physics.
2014 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

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.

Abstract [sv]

KUNGLIGA TEKNISKA HOGSKOLAN

Sammanfattning

Laserfysikgruppen

Institutionen for Tillampad Fysik

SA104X Examensarbete inom Teknisk Fysik, Grundniva

Fiberbraggitter

i Temperatur- och Spanningssensorer

av Ilian

Haggmark

Handledare: Michael

Fokine

Ett berbraggitter (FBG) ar en periodisk variation av brytningsindex i en optisk ber.

FBG fungerar som ett vaglangdsselektivt lter och har era olika tillampningar inom

bland annat telekomunikation och sensorerteknik. Fibersensorer bygger pa en enkel

princip; bern paverkas av temperatur, spanning m.m. och da forandras ltreringen

av vaglangder i FBG. Med en optisk spektrumanalysator kan forandringar i vaglangd

registreras och konverteras till den storhet som mats. In detta examensarbete testas de

egenskaper hos FBG som utnyttjas i temperatur- och spanningssensorer. Experiment for

att forbattra precisionen hos sensorerna genom att gjuta in FBG i metall utfors ocksa.

Place, publisher, year, edition, pages
2014. , 34 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-145741OAI: oai:DiVA.org:kth-145741DiVA: diva2:720261
Supervisors
Available from: 2014-05-28 Created: 2014-05-28 Last updated: 2014-09-22Bibliographically approved

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