| 光栅尺的I-Q平衡式光电编码与解码方法 |
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| 引用本文： | 曹湛昕,古宇达,周延周.光栅尺的I-Q平衡式光电编码与解码方法[J].广东工业大学学报,2021,38(3):42-47. |
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| 作者姓名： | 曹湛昕 古宇达 周延周 |
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| 作者单位： | 广东工业大学 自动化学院，广东 广州 510006 |
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| 基金项目： | 国家自然科学基金资助项目(61875041，61727810，61771148)；广州市科技计划项目 (201902010045) |
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| 摘 要： | 光栅作为位移、速度和加速度测量的重要器件, 在高精度、高速自动化数控反馈闭环系统有广泛应用。为增强其高速测量的可靠性, 提出了一种直线光栅尺的I-Q平衡式光电编码与解码方法。主光栅和指示光栅平行放置, 光栅常数差别形成莫尔条纹。光电探测单元的每个光电二极管为独立检测通道, 按照固定空间频率莫尔条纹相对相位位置分布, 并经过独立的、按I-Q平衡式编码与解码方程设计放大倍数的直流运放电路放大, 最后按I-Q平衡式编码与解码方程条件分别送入2路加法器, 加法器输出就是标准和通用的2路I-Q正交信号, 符合自动化设备使用标准。该方法使得自动化数控闭环系统的抗光栅表面污染、抗光电二极管分布位置误差和抗低频振动等能力全面增强, 是一种高效、可靠、实用性强的光栅技术。
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| 关 键 词： | 光栅尺 莫尔条纹 直流运放电路 傅里叶变换 信号处理 |
| 收稿时间： | 2020-10-19 |
I-Q Balanced Photoelectric Coding and Decoding Method of Grating Ruler |
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| Cao Zhan-xin,Gu Yu-da,Zhou Yan-zhou.I-Q Balanced Photoelectric Coding and Decoding Method of Grating Ruler[J].Journal of Guangdong University of Technology,2021,38(3):42-47. |
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| Authors: | Cao Zhan-xin Gu Yu-da Zhou Yan-zhou |
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| Affiliation: | School of Automation, Guangdong University of Technology, Guangzhou 510006, China |
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| Abstract: | As an important device for displacement, velocity and acceleration measurement, gratings are widely used in high-precision, high-speed automated CNC feedback closed-loop systems. In order to enhance the reliability of high-speed measurement, a linear encoder with I-Q balanced photoelectric coding and decoding method is proposed. The main grating and the indicating grating are placed in parallel, and the difference in grating constant forms a moiré fringe. Each photodiode of the photodetection unit is an independent detection channel, which is distributed according to the relative phase position of the moiré fringe at a fixed spatial frequency, and is amplified by an independent DC operational amplifier circuit designed according to the I-Q balanced encoding and decoding equation. I-Q balanced encoding and decoding equation conditions are respectively sent to the 2-way adder, and the output of the adder is the standard and general 2-way I-Q quadrature signal, which is in line with the standard for automation equipment. This method comprehensively enhances the automatic numerical control closed-loop system's anti-grating surface pollution, anti-photodiode distribution position error and anti-low-frequency vibration ability, and is an efficient, reliable, and practical grating technology. |
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| Keywords: | grating ruler Moire fringe DC operational amplifier circuit Fourier transform signal processing |
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