Title :
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
fDate :
11/7/1995 12:00:00 AM
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;
Conference_Titel :
Progress in Fibre Optic Sensors and Their Applications, IEE Colloquium on
Conference_Location :
London
DOI :
10.1049/ic:19951210
