An Optical Fibre Linear Position Sensor with Centimetre Scan Utilising White Light Interferometry and Two Light Sources of Widely Separated Wavelengths
The accurate measurement of displacement or position is an important procedure in many applications. Many sensors are based on inductive coupling (eg LVDT), however there is interest in using optical fibres for such measurements due to the reduced weight and electromagnetic immunity. Here an optical fibre based system using highly birefringent fibre is described with the fibre acting as the active sensing element. Using the technique of white light interferometry (WLI)1 high resolution measurement may be made over a large range (centimetres).
KeywordsInterference Fringe Path Difference Michelson Interferometer Fixed Coupling Point Coupling Point
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