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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

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Reflection optical encoders as three-grating moiré systems.

D Crespo¹, J Alonso, E Bernabeu

¹Departamento de Optica, Universidad Complutense de Madrid, Avenida Complutense syn, 28040 Madrid, Spain.

|March 20, 2008

Summary

This study analyzes reflection optical encoders using a three-grating moiré system. It identifies differences compared to standard two-grating optical encoder models.

Area of Science:

Optics and Photonics
Metrology and Measurement

Background:

Optical encoders are crucial for motion control and measurement.
Standard optical encoders are typically modeled as two-grating systems.
Moiré fringe analysis is a common technique in optical metrology.

Purpose of the Study:

To investigate reflection optical encoders as three-grating moiré systems.
To analyze the discrepancies between three-grating and two-grating models.
To enhance the understanding of reflection optical encoder performance.

Main Methods:

Modeling reflection optical encoders as three-grating moiré systems.
Comparative analysis of three-grating and two-grating optical encoder configurations.
Theoretical investigation of moiré fringe formation in reflection encoders.

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Main Results:

Identified specific differences arising from the three-grating configuration.
Quantified potential deviations from the standard two-grating model.
Provided a more detailed understanding of the optical physics involved.

Conclusions:

The three-grating moiré system offers a more comprehensive model for reflection optical encoders.
Understanding these differences is key to improving encoder accuracy and performance.
This analysis advances the theoretical framework for optical encoder design.