A multi-mode optical fibre sensing system using white light interferometry

Author

Wang, Q. ; Ning, Y.N. ; Grattan, K.T.V. ; Palmer, A.W.

Author_Institution

Dept. of Electr. Electron. & Inf. Eng., City Univ., London, UK

fYear

1995

fDate

11/7/1995 12:00:00 AM

Firstpage

42401

Lastpage

223

Abstract

Firstly, the theory of the white light interferometer is presented. This is followed by minimum peak height difference and related experimental results. The curve fitting signal processing scheme and the best order of polynomial for curve fitting are then discussed. Finally, displacement measurement with and without curve fitting signal processing is examined. The results show that, with a two wavelength source, the central fringe can be identified if the sampling gap is smaller than the maximum sampling OPD gap. The noise in the system can be reduced by the curve fitting technique proposed. The best order of the polynomial used to carry out curve fitting is four according to the experimental results and the analysis

Keywords

Michelson interferometers; curve fitting; displacement measurement; fibre optic sensors; light interferometry; measurement errors; polynomials; position measurement; signal sampling; Michelson interferometer; best order of polynomial; central position measurement; curve fitting signal processing scheme; displacement measurement; maximum sampling gap; measurement error; minimum peak height difference; multimode optical fibre sensing system; noise reduction; optical path difference; tandem interferometer; two wavelength source; white light interferometry;

fLanguage

English

Publisher

iet

Conference_Titel

Progress in Fibre Optic Sensors and Their Applications, IEE Colloquium on

Conference_Location

London

Type

conf

DOI

10.1049/ic:19951210

Filename

499535