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Measuring Spatially- and Directionally-varying Light Scattering from Biological Material

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Method of rotation angle measurement in machine vision based on calibration pattern with spot array.

Weimin Li¹, Jing Jin, Xiaofeng Li

¹Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, 96#, Jing Zhai Road, Hefei, Anhui Province, China. liwm@ustc.edu

|February 23, 2010

Summary

This study introduces a precise, noncontact machine vision method for rotation angle measurement using a CCD camera and spot array pattern. The system achieves high accuracy, with measurement deviations under 3 arc seconds for various angles.

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Area of Science:

Machine Vision
Metrology
Optical Measurement

Background:

Accurate rotation angle measurement is crucial in industrial automation and precision engineering.
Existing methods may face limitations in precision, contact requirements, or adaptability to micro/large angles.

Purpose of the Study:

To develop and validate a high-precision, noncontact method for rotation angle measurement.
To establish a machine vision system capable of detecting subtle angular displacements.
To assess the system's performance under simulated noise conditions.

Main Methods:

Utilizing an area scan CCD camera, imaging lens, and a calibration pattern with a spot array.
Implementing camera calibration to model distortion errors based on the spot array.
Applying coordinate rotation measurement equations to determine the angle from acquired spot coordinates.

Main Results:

The developed system precisely measures rotation angles using a noncontact approach.
Theoretical simulations incorporating noise demonstrated robust performance.
Experimental results showed a standard deviation of measurement below 3 arc seconds.

Conclusions:

The proposed machine vision method offers a highly accurate and noncontact solution for rotation angle measurement.
The system is effective for both micro- and large-angle measurements.
This technique has potential applications in precision manufacturing and quality control.