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This paper presents a novel design of a laser linear encoder based on the principle of diffractive
interferometry. It adopts a special design in optical path that can increase the alignment tolerance between the
optical head and the grating. Because of the simple optical configuration and the merit of compact size, it can
effectively reduce the environmental disturbance and allow higher stability. In addition, the signal process
circuit can effectively decrease three major errors: the DC shift difference, the electronic gain difference and
the phase orthogonal error of two sinusoid al output signals. The resolution can reach to 1nm. Experiment
results showed the standard deviation was below 17nm for 15mm travel in normal laboratory environment.
Kuang-Chao Fan,Bai-Kun Li, andChi-Hui Liu
"A diffraction grating scale for long range and nanometer resolution", Proc. SPIE 7133, Fifth International Symposium on Instrumentation Science and Technology, 71334J (12 January 2009); https://doi.org/10.1117/12.815188
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Kuang-Chao Fan, Bai-Kun Li, Chi-Hui Liu, "A diffraction grating scale for long range and nanometer resolution," Proc. SPIE 7133, Fifth International Symposium on Instrumentation Science and Technology, 71334J (12 January 2009); https://doi.org/10.1117/12.815188