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An Optical Fibre Linear Position Sensor with Centimetre Scan Utilising White Light Interferometry and Two Light Sources of Widely Separated Wavelengths

  • K. Weir
  • A. W. Palmer
  • K. T. V. Grattan

Abstract

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).

Keywords

Interference Fringe Path Difference Michelson Interferometer Fixed Coupling Point Coupling Point 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    R Ulrich, ‘Interferometric and polarimetric sensors using white-light interferometry’, Springer Proceedings in Physics, Vol. 44 Optical Fiher Sensors, pp 62–3 (1989).CrossRefGoogle Scholar
  2. 2.
    J Noda, K Okamoto & Y Sasaki, ‘Polarization maintaining fibres and their applications’, J. Lightwave Technol., LT-4, pp 1071–1089 (1986).CrossRefGoogle Scholar
  3. 3.
    D N Wang, Y N Ning, K T V Grattan, A W Palmer, & K Weir, ‘The optimized wavelength combination of two broadband light sources for white light interferometry’, J. Lightwave Technol. in press (1993).Google Scholar

Copyright information

© Springer Science+Business Media New York 1995

Authors and Affiliations

  • K. Weir
    • 1
  • A. W. Palmer
    • 1
  • K. T. V. Grattan
    • 1
  1. 1.Measurement and Instrumentation Centre, Department of Electrical, Electronic & Information EngineeringCity UniversityLondonUK

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