A double-fibre Fabry-Perot sensor based on modified fringe counting and direct phase demodulation

M. Li, B. Tong, Norhana Arsad, J. J. Guo

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

A modified double-fibre Fabry-Perot cavity is developed for determination of the fringe moving direction and higher sensitivity in applications of liquid level and displacement sensors. Two fibres are integrated into a silica ferrule where the ends of the two fibres in the ferrule serve as the front surfaces of the Fabry-Perot cavities, and a diaphragm, which is replaced by a moving mirror for measurement of displacement, serves as the rear surface for both cavities in liquid level sensing. Our design has no strict requirements for a specific phase difference between the two optical paths, just a constant difference resulting from the processing error between the two fibre end positions rather than a precise optical path difference of λ/8 to judge the pattern shift direction. Experimental results demonstrate the feasibility of this approach to determining the fringe moving direction, a displacement sensitivity of 3m and good linearity for both applications.

Original languageEnglish
Article number094012
JournalMeasurement Science and Technology
Volume24
Issue number9
DOIs
Publication statusPublished - Sep 2013

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Fabry-Perot
Demodulation
demodulation
Counting
counting
Fiber
Fabry-Perot Cavity
liquid levels
Sensor
fibers
Fibers
sensors
Sensors
optical paths
cavities
Liquid
Path
sensitivity
Phase Difference
Liquids

ASJC Scopus subject areas

  • Applied Mathematics
  • Instrumentation

Cite this

A double-fibre Fabry-Perot sensor based on modified fringe counting and direct phase demodulation. / Li, M.; Tong, B.; Arsad, Norhana; Guo, J. J.

In: Measurement Science and Technology, Vol. 24, No. 9, 094012, 09.2013.

Research output: Contribution to journalArticle

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