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Optical Engineering

Displacement measurement utilizing contrast variation of a projected pattern
Author(s): Toru Yoshizawa; Akiyoshi Tochigi
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Paper Abstract

A system has been developed and tested for optical noncontact measurement of displacement. The system consists of a light source, an objective lens, a quadrant pattern, and a quadrant photodiode. The principle is based on the detection of the contrast variation of the projected quadrant pattern as a function of defocus. This system has coaxial projection and observation axes and is hardly influenced by the color and inclination of the surface. The dynamic range ofthe measurement system is 150 μm with vertical resolution of 1 μm. Experimental tests verify the principle of the method and some tests of the system in applications are tried with expected results.

Paper Details

Date Published: 1 August 1992
PDF: 5 pages
Opt. Eng. 31(8) doi: 10.1117/12.58725
Published in: Optical Engineering Volume 31, Issue 8
Show Author Affiliations
Toru Yoshizawa, Tokyo Univ. of Agriculture and Technology (Japan)
Akiyoshi Tochigi, Tokyo Univ. of Agriculture and Technology (Japan)

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