Displacement measurement utilizing contrast variation of a projected pattern

Toru Yoshizawa; Akiyoshi Tochigi

doi:10.1117/12.58725

1 August 1992 Displacement measurement utilizing contrast variation of a projected pattern

Toru Yoshizawa, Akiyoshi Tochigi

Author Affiliations +

Optical Engineering, Vol. 31, Issue 8, (August 1992). https://doi.org/10.1117/12.58725

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.

Citation Download Citation

Toru Yoshizawa and Akiyoshi Tochigi "Displacement measurement utilizing contrast variation of a projected pattern," Optical Engineering 31(8), (1 August 1992). https://doi.org/10.1117/12.58725

Published: 1 August 1992

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