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Proceedings Paper

A low coherence interferometric sensing method with analysis and experimental results for voltage sensing
Author(s): Andrew Michie; Ian Bassett; John Haywood
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Paper Abstract

In this paper a low coherence interferometric sensing method is presented. The magnitude of a small optical path length imbalance is monitored by measuring the wavelength dependence of the interferometer's output. The interferometer produces a spectral modulation, or interferogram, imposed on the background spectrum of the broadband light source used to illuminate the sensor. The interferograms are then recorded using a high-speed spectrometer and the small optical path imbalance is calculated by processing the interferogram in a computer using a Fast Fourier Transform (FFT). This sensing system has been configured to form the basis for an optical fibre voltage sensor. The system monitors the total retardance of a section of thermally poled twin hole silica fibre (sensing fibre). Transverse electric fields applied to the sensing fibre will then modulate its total retardance due to the polarisation dependence of the induced linear electrooptic effect. Experimental results for linearity, and an analysis of the methods used are presented.

Paper Details

Date Published: 23 May 2005
PDF: 4 pages
Proc. SPIE 5855, 17th International Conference on Optical Fibre Sensors, (23 May 2005); doi: 10.1117/12.623793
Show Author Affiliations
Andrew Michie, OFTC, Univ. of Sydney and the Australian Photonics CRC (Australia)
Ian Bassett, OFTC, Univ. of Sydney and the Australian Photonics CRC (Australia)
John Haywood, OFTC, Univ. of Sydney and the Australian Photonics CRC (Australia)


Published in SPIE Proceedings Vol. 5855:
17th International Conference on Optical Fibre Sensors
Marc Voet; Reinhardt Willsch; Wolfgang Ecke; Julian Jones; Brian Culshaw, Editor(s)

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