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Design and construction of linear laser encoders that possess high tolerance of mechanical runout.

Authors
Type
Published Article
Journal
Applied optics
Publication Date
Volume
43
Issue
31
Pages
5754–5762
Identifiers
PMID: 15540432
Source
Medline
License
Unknown

Abstract

A linearly diffracted laser encoder that has high tolerance of head-to-scale misalignment and a high signal-to-noise ratio is described. The preservation of parallelism between the incident and the diffracted beams, which can be attributed to a built-in folded 1x telescope, allows for the high alignment tolerance. It can be shown that, by coupling this newly developed circular polarization interferometer configuration with grating scale geometry optimization, one can eliminate the problems associated with signal distortion that arise from various efficiencies of the p- and the s-polarized light beams and obtain a high signal-to-noise ratio. Both theoretical and experimental results are presented to confirm the improved results and performance.

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