A low coherence interferometric sensing method with analysis and experimental results for voltage sensing

Andrew Michie; Ian Bassett; John Haywood

doi:10.1117/12.623793

23 May 2005 A low coherence interferometric sensing method with analysis and experimental results for voltage sensing

Andrew Michie, Ian Bassett, John Haywood

Proceedings Volume 5855, 17th International Conference on Optical Fibre Sensors; (2005) https://doi.org/10.1117/12.623793
Event: 17th International Conference on Optical Fibre Sensors, 2005, Bruges, Belgium

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.

Citation Download Citation

Andrew Michie, Ian Bassett, and John Haywood "A low coherence interferometric sensing method with analysis and experimental results for voltage sensing", Proc. SPIE 5855, 17th International Conference on Optical Fibre Sensors, (23 May 2005); https://doi.org/10.1117/12.623793

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