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Improving the angle measurement accuracy of circular grating.

¹College of Mechanical Engineering, Chongqing University, Chongqing 400044, People's Republic of China.

The Review of Scientific Instruments

|July 3, 2020

Summary

This study introduces a new method using compressed sensing and sparsity decomposition to enhance angle measurement accuracy in circular gratings, overcoming installation errors in precision turntables.

Area of Science:

Precision Engineering
Metrology
Signal Processing

Background:

Circular gratings are crucial for angle displacement feedback in precision turntables.
Installation errors in measurement systems lead to angle measurement inaccuracies.
These errors limit the achievable angle positioning precision of turntables.

Purpose of the Study:

To propose a novel method for improving the angle measurement accuracy of circular gratings.
To address and mitigate the impact of installation errors on measurement precision.
To enhance the overall performance of precision turntable systems.

Main Methods:

Development of a novel method based on compressed sensing principles.
Application of sparsity decomposition techniques for error correction.

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Implementation and testing within an experimental system setup.

Main Results:

The proposed method effectively improves the angle measurement accuracy of circular gratings.
Experimental validation confirmed the efficacy of the compressed sensing and sparsity decomposition approach.
Significant reduction in angle measurement errors caused by installation inaccuracies was observed.

Conclusions:

The novel method successfully enhances circular grating measurement accuracy.
Compressed sensing and sparsity decomposition offer a viable solution for installation error compensation.
This approach contributes to improving the precision of turntable angle positioning systems.