High-resolution fibre-optic sensor for angular displacement measurements

The design of a fibre-optic sensor able to measure high-precision angular displacements is presented. The sensor has a small size which allows easy integration in miniature mechanical systems. Two configurations are designed: lens-free configuration and GRIN micro-lens configuration for which the mi...

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Bibliographic Details
Published in:Measurement science & technology 2010-02, Vol.21 (2), p.025306-025306
Main Authors: Khiat, A, Lamarque, F, Prelle, C, Bencheikh, N, Dupont, E
Format: Article
Language:English
Subjects:
Actuators
Design engineering
Displacement
Fiber optics
Mathematical models
Miniature
Optical fibers
Sensors
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Description
Summary:The design of a fibre-optic sensor able to measure high-precision angular displacements is presented. The sensor has a small size which allows easy integration in miniature mechanical systems. Two configurations are designed: lens-free configuration and GRIN micro-lens configuration for which the micro-lens is fixed on the tip of the probe. The experimental results obtained by the angular displacement sensor based on the lens-free configuration are compared with the simulation results based on the modelling of the system and a good agreement is found. Then, a long-range measurement technique is described. In the 'lens-free and long-range configuration', the limit of resolution is measured (2 X 10-3 degree ) or calculated (4.8 X 10-4 degree ) over a range of [-23.4 degree , +23.4 degree ]. In the 'GRIN lens and long-range configuration', the best limit of resolution is decreased to 2.2 X 10-4 degree but over a smaller range of [--14.5 degree , +14.5 degree ]. Finally, the sensor in its 'lens-free configuration' design is integrated into a miniature electromagnetic actuator to determine its stroke by a comparison of the output signal obtained between this unknown-stroke actuator and a rotating stage for which the stroke was precisely known.
ISSN:0957-0233
1361-6501
DOI:10.1088/0957-0233/21/2/025306