Thermal transients of coated optical fibres exposed to microwave power at 2.45 GHz

Author

Sacco, M.J. ; Auchterlonie, L.J. ; Harris, A.J.

Author_Institution

Dept. of Electr. & Electron. Eng., Newcastle-upon-Tyne Univ., UK

Volume

137

Issue

3

fYear

1990

fDate

6/1/1990 12:00:00 AM

Firstpage

174

Lastpage

180

Abstract

Measurements are made of the thermal response of coated single-mode optical fibres to microwave power at 2.45 GHz using an all-fibre Mach-Zehnder interferometer. A carbon based secondary coating has been used as the energy absorbing medium. Computer based analysis of the thermal transient includes consideration of thermal conduction within the fibre together with both radiative and convective heat losses at the outer surface. A simplified treatment of the convection loss has been employed, in which the convective heat transfer coefficient is assumed to be constant during the thermal transient. The predictions of the adopted model are compared with measurements, the degree of agreement justifying the model. A convective process is identified as the dominant heat loss mechanism

Keywords

fibre optic sensors; heat transfer; light interferometers; microwave measurement; protective coatings; radiofrequency heating; 2.45 GHz; C based coating; all-fibre Mach-Zehnder interferometer; coated optical fibres; convection loss; convective heat losses; convective heat transfer coefficient; dominant heat loss mechanism; energy absorbing medium; fibre optic sensors; microwave power; outer surface; radiative heat losses; single-mode optical fibres; thermal conduction; thermal response; thermal transients;

fLanguage

English

Journal_Title

Optoelectronics, IEE Proceedings J

Publisher

iet

ISSN

0267-3932

Type

jour

Filename

52935