Design of two-dimensional zero reference codes by means of a global optimization method

A method to obtain the absolute measure of the position is by means of the autocorrelation of two zero reference marks. In one-axis measurement systems one dimensional mark are used and the design of these marks is relatively complex. When the movement is in two-axes, two dimensional reference marks...

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Bibliographic Details
Published in:Optics express 2005-05, Vol.13 (11), p.4230-4236
Main Authors: Sáez-Landete, José, Alonso, José, Bernabeu, Eusebio
Format: Article
Language:English
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Summary:A method to obtain the absolute measure of the position is by means of the autocorrelation of two zero reference marks. In one-axis measurement systems one dimensional mark are used and the design of these marks is relatively complex. When the movement is in two-axes, two dimensional reference marks are required and they are even harder to design. We report a method of global optimization to calculate the optimal two dimensional zero reference marks which generate the reference signal with the highest central peak. This method proves to be a powerful tool for solving this problem.
ISSN:1094-4087
1094-4087
DOI:10.1364/OPEX.13.004230