JZUS - Journal of Zhejiang University SCIENCE

Frontiers of Information Technology & Electronic Engineering

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A digital moiré fringe method for displacement sensors

Author(s): Jian Wu, Ting-ting Zhou, Bo Yuan, Li-qiang Wang
Affiliation(s): State Key Laboratory of Modern Optical Instrumentation, CNERC for Optical Instrument, Zhejiang University, Hangzhou, 310027, China
Corresponding email(s): yuanbo@zju.edu.cn
Key Words: Digital moiré fringe, Displacement measurement, Grating

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Jian Wu, Ting-ting Zhou, Bo Yuan, Li-qiang Wang. A digital moiré fringe method for displacement sensors[J]. Frontiers of Information Technology & Electronic Engineering,in press.https://doi.org/10.1631/FITEE.1500270

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author="Jian Wu, Ting-ting Zhou, Bo Yuan, Li-qiang Wang",
journal="Frontiers of Information Technology & Electronic Engineering",
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doi="https://doi.org/10.1631/FITEE.1500270"
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doi="https://doi.org/10.1631/FITEE.1500270"

Abstract
Chinese Summary
Academic Network
Reviewer Comment

Abstract: In this study, a displacement measurement method based on digital moiré fringe is described and experimentally demonstrated. The method is formed by only one grating with a constant pitch. First, the magnified grating image is received by an imaging array and is sent to a computer. Then, the digital moiré fringes are generated by overlaying the grating image with its mirrored one. Finally, a specifically designed algorithm is used to obtain the fringes’ phase difference before and after movement and calculate the displacement. This method has the effects of amplifying displacement and averaging the grating lines error, the same as the traditional moiré technique using two pieces of gratings. At the same time, the proposed system is much easier to assemble and the measurement resolution can be set more flexibly. One displacement measuring system based on this method was built up. Experiment results show that its measurement errors are less than 0.3 µm and less than 0.12 µm at the resolutions of 0.1 µm and 0.03 µm, respectively.

Abstract: The authors present a well-known digital Moiré fringe method, which the authors applied like a displacement sensor and claim easier to assemble and more flexible to set the resolution displacement measuring system using a single grating. Because this method does not need complex grating interference system, it has the advantage of being easy to operate. The proposal is presented in a generally clear manner. Then the author shows the displacement calculation and its resolutions. Finally some experiments and quality of the Moiré fringes are presented.

一种用于位移传感器的数字莫尔方法

目的：在传统莫尔条纹技术的基础上，提出一种装调方便、分辨率可调节的位移测量技术。
创新点：仅使用一块光栅，利用图像处理技术生成数字莫尔条纹，从而既具有传统莫尔条纹技术的优点，又方便装调和系统分辨率设置。
方法：首先，利用面阵探测器接收光栅的放大像，并将图像信号送入计算机中。然后，将光栅像与其镜像像进行叠加产生数字莫尔条纹，并对条纹信号进行积分以得到数字莫尔曲线。最后，利用特殊设计算法估计条纹移动前后的相位差，并根据相位差计算位移量。本文根据所提出的方法构建了一套位移测量系统，对系统的稳定性、灵敏度和测量精度进行了测试。
结论：提出了一种基于数字莫尔条纹技术的位移测量方法，它既具有传统莫尔条纹技术的位移放大和误差平均的优点，又装调方便且可灵活调节分辨率。通过实验验证了该方法的可行性。

关键词组：数字莫尔条纹；位移测量；光栅

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Reference

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一种用于位移传感器的数字莫尔方法

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