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Optical Engineering

Optical fiber displacement sensors for process and manufacturing applications
Author(s): Ronald C. Spooncer; Clive Butler; Barry E. Jones
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Paper Abstract

We describe three novel optical fiber probes, all based on the focused-beam reflective principle, to measure displacement, form, and surface topography, respectively. Each depends on deriving twin displacement/optical output characteristics that may be resolved by difference/sum referencing. The displacement sensor adopts twowavelength operation using a zone plate to give opposing displacement/output characteristics. The device is noncontacting, and a resolution of better than 0.1% of span is anticipated. A 3-D optical touchprobe has been built for use with coordinate measuring machines. A mathematical model has been generated that relates output to stylus movement, and the model has been verified experimentally. A resolution of 0.1 μm in the x-y plane and 1.0 μm in the z direction is achievable. A further noncontacting probe has been developed for the measurement of surface topography whose output shows low dependency on surface reflectance. A mathematical model has shown good correspondence against a wide range of surface compositions and textures; a resolution of better than 1 μm is foreseen. Proposals are made for industrial implementation of all three probes.

Paper Details

Date Published: 1 August 1992
PDF: 6 pages
Opt. Eng. 31(8) doi: 10.1117/12.58847
Published in: Optical Engineering Volume 31, Issue 8
Show Author Affiliations
Ronald C. Spooncer, Brunel Univ. (United Kingdom)
Clive Butler, Brunel Univ. (United Kingdom)
Barry E. Jones, Brunel Univ. (United Kingdom)

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