Effect of infrared light source parameters on photoelectric encoder
-
摘要: 红外发光管是光电编码器的重要组成部分,而光源参数对莫尔条纹信号的正弦性和正交性有直接影响,从而影响光电编码器的细分精度和分辨力。文中研究了其发散角、光源宽度对编码器的信号影响。首先,分析了光源对光栅信号光通量的影响,运用频域方法导出了透光特性函数;然后,分析了两种不同光源对同一码盘形成信号的影响;最后,应用Matlab仿真计算了莫尔条纹信号的对比度、正交性、正弦性。实验结果表明,使用两种不同光源的编码器精度相差达到30%,改进后的编码器高次谐波占比明显减少,信号稳定性好。因此研究光源参数对提取高质量莫尔条纹有重要意义,并为高精度编码器设计提供重要参考依据。Abstract: Infrared diodes are important components of photoelectric encoder,the orthogonality and sine of Moire fringe directly affect the segmentation accuracy and resolution of photoelectric encoder, and they affect the light source parameters. According to the investigation, the divergence angle and the width of light source exert a tremendous influence in signal of encoder. Firstly, the effect of light source on the grating signal flux was analyzed. The application of the frequency domain method helped deduce the function of light transmission feature; Then the impact of the two different light source on the signal creation with a yard plate and the contrast ratio was computed; Finally, orthogonality and sinusoidal property of the Moir stripe signal were simulated at MATLAB environment. The result shows that the encoder accuracy difference between them reached 30% by applying different source. Higher harmonic proportion of the improved decoder decreases significaitly and the signal stability is better. Studying the light source parameters has great significance in extracting the Moire fringe of high quality, and offers valuable reference for designing high-precision encoder.
-
Key words:
- light source /
- divergence angle /
- width of light source /
- simulation /
- high-quality grating signal
-
[1] Zhu Yifeng, Mu Yining, Yu Lintao. Method of grating angle detection using slit light battery[J]. Infrared and Laser Engineering, 2012, 41(12):3396-3400. (in Chinese) 朱一峰, 母一宁, 于林韬. 狭缝光电池的光栅角度检测方法[J]. 红外与激光工程, 2012, 41(12):3396-3400. [2] Wang Xianjun. Errors and precision analysis of subdivision signals for photoelectric angle encoders[J]. Optics and Precision Engineering, 2012, 20(2):379-386. (in Chinese) 王显军. 光电轴角编码器细分信号误差及精度分析[J]. 光学精密工程, 2012, 20(2):379-386. [3] Wang Shuai, Wang Jianli, Chen Tao, et al. Application of the nonlinear tracking-differentiator in velocity estimation on optical encoder[J]. Infrared and Laser Engineering, 2009, 38(5):849-853. (in Chinese) . 王帅, 王建立, 陈涛, 等. 非线性跟踪微分器在光电编码器测速中的应用[J].红外与激光工程, 2009, 38(5):849-853. [4] Gao Xu, Wan Qiuhua, Zhao Changhai, et al. Real-time compensation of orthogonality deviation for Moir fringe photoelectric signal[J]. Optics and Precision Engineering, 2014, 22(1):213-219. (in Chinese) 高旭, 万秋华, 赵长海, 等. 莫尔条纹光电信号正交性偏差的实时补偿[J]. 光学精密工程, 2014, 22(1):213-219. [5] Ye Shengxiang. The Photoelectric Technology of Precise Measuring Displacement[M]. Chengdu:Sichuan Science and Technology Press, 2003. (in Chinese) 叶盛祥. 光电位移精密测量技术[M]. 成都:四川科学技术出版社, 2003. [6] Zhang Shanzhong. The Technology of Metrology Grating[M]. Beijing:China Machine Press, 1985. (in Chinese) 张善锺. 计量光栅技术[M]. 北京:机械工业出版社, 1985. [7] Tu Dawei, Wu Rengmao, Yang Hengliang, et al. Effectof optical structure on output light intensity distribution in LED package[J]. Opt Precision Eng, 2008, 6(5):832-837. (in Chinese) 屠大维, 吴仍茂, 杨恒亮, 等. LED封装光学结构对光强分布的影响[J]. 光学精密工程, 2008, 16(5):832-837. [8] Jing Lei, Liu Hua, Zhao Huifu, et al. Compact collimator design for high-brightness light-emitting diode[J].Acta Optica Sinica, 2011, 31(12):1222001. (in Chinese) 荆雷, 刘华, 赵会富, 等. 紧凑型高亮度发光二极管准直镜设计[J]. 光学学报, 2011, 31(12):1222001. [9] Gao Xu, Wan Qiuhua, Lu Xinran, et al. Automatic compensation of sine deviation for grating fringe photoelectric signal[J]. Acta Optica Sinica, 2013, 33(7):0712001. (in Chinese) 高旭, 万秋华, 卢新然, 等. 光栅条纹光电信号正弦性偏差的自动补偿[J]. 光学学报, 2013, 33(7):0712001. [10] Wang Xianjun. Errors and precision analysis of subdivision signals for photoelectric angle encoder[J]. Optics and Precision Engineering, 2012, 20(2):379-386. (in Chinese) 王显军. 光电轴角编码器细分信号误差及精度分析[J]. 光学精密工程, 2012, 20(2):379-386. [11] Zhao Changhai. The research of measure method of dynamic interpolation errors of high precision photoelectric encoder[D]. Beijing:University of Chinese Academy of Sciences, 2008. (in Chinese) 赵长海. 高精度光电编码器动态细分误差的测量方法研究[D]. 北京:中国科学院大学, 2008.
计量
- 文章访问数: 408
- HTML全文浏览量: 62
- PDF下载量: 35
- 被引次数: 0