@inproceedings{f02e37f5af3848718e6b9bf2dde4e7f3,
title = "High-precision radius automatic measurement using laser differential confocal technology",
abstract = "A high precision radius automatic measurement method using laser differential confocal technology is proposed. Based on the property of an axial intensity curve that the null point precisely corresponds to the focus of the objective and the bipolar property, the method uses the composite PID (proportional-integral-derivative) control to ensure the steady movement of the motor for process of quick-trigger scanning, and uses least-squares linear fitting to obtain the position of the cat-eye and confocal positions, then calculates the radius of curvature of lens. By setting the number of measure times, precision auto-repeat measurement of the radius of curvature is achieved. The experiment indicates that the method has the measurement accuracy of better than 2 ppm, and the measuring repeatability is better than 0.05 μm. In comparison with the existing manual-single measurement, this method has a high measurement precision, a strong environment anti-interference capability, a better measuring repeatability which is only tenth of former{\texttrademark}s..",
keywords = "Automatic measurement, Composite PID control, Curvature of radius of lens, Differential confocal, High precision",
author = "Hongwei Jiang and Weiqian Zhao and Jiamiao Yang and Yongkui Guo and Yang Xiao",
note = "Publisher Copyright: {\textcopyright} 2015 SPIE.; International Conference on Photonics and Optical Engineering, icPOE 2014 ; Conference date: 13-10-2014 Through 15-10-2014",
year = "2015",
doi = "10.1117/12.2081341",
language = "English",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Weiguo Liu and Anand Asundi and Chunmin Zhang and Ailing Tian",
booktitle = "International Conference on Photonics and Optical Engineering, icPOE 2014",
address = "United States",
}