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A novel method of steel tape zero calibration




LI Yi-ming, WANG Zhong, CHEN Xi, LU Rui-jun


(State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China)


Abstract: In view of the movable hook structure on zero position, the traditional system could not recognize the zero scale. According to the essential requirements of the measurement, a new system based on machine vision was proposed. Standard datum planes and standard scales were designed as standard component, and the indication error can be calculated by comparing the standard component and the measured value between zero position and 500 mm scale. The alignment of scribed lines was realized by machine vision, and the float pixel equivalent method was applied in image process. Experimental results prove that this system meets the requirement of national standard steel tape verification regulation, and the repeatability of zero error can reach 0.006 mm after zero calibration.


Key words: zero calibration;  zero scale collimation; movable hook structure;  standard datum planes and standard scales;  float pixel equivalent


CLD number: TH711.2                                             Document code: A

Article ID: 1674-8042(2018)02-0103-06           doi: 10.3969/j.issn.1674-8042.2018.02.001



References


[1]China JJG 4-2015. Institute of metrological supervision and testing. Tianjin: Tianjin Institute of Metrological Supervision and Testing, 2015.

[2]Gou J S. Research of the new steel tape automatic verification mechanism. Tianjin: Tianjin University, 2015.

[3]Chen S T, Qian X Y, Zhou M. Research of automation steel tape measurement system based on PLC and Computer Vision technology. In: Proceedings of IEEE World Congress on Software Engineering, 2009, (1): 251-255.

[4]Yu C L, Zang Y G, Xie W H. New steel tape measure verification equipment research. China Metrology, 2012, 56(5): 76-77.

[5]Li S H. Verification zero deviation of sounding steel tape. Measurement Technique, 1999, (4): 27-28.

[6]Lei T, Zeng B C. Steel tape automatic zero alignment system based on Labview. Metrology & Measurement Technique, 2016, 43(4): 57-59.

[7]Huang L H, Liu N. Length value in-kind transfer standard-gauge block. Brand & Standardization, 2010, 12(4): 41-43. 

[8]Gou J S, Wang Z, Shen X L. New float equivalent calibration method for 2D image measuring system. In: Proceedings of SPIE International Conference on Optical Instruments and Technology, 2015, (9623): 962310-962318. 

[9]Zhao B Y, Wei C Q, Kang H F. Image binarization method of steel tape based on edge detection. Modern Manufacturing Engineering, 2012,15(12): 101-104.

[10]Mao Z H, Du Z P, Zhang X. Low cost and high precision steel tape automatic calibration device. China Metrology, 2011, 22(2): 88-90.

[11]Wei C Q, Wang X G, Kang H F. Steel tape automatic verification system based on image processing. Instrument Technique and Sensor, 2012, (6): 88-90.

[12]Xu J. Steel tape automatic calibration device based on machine vision detection technology. Measurement Technique, 2009, (11): 50-53.


一种新型钢卷尺零位标定方法


李一鸣, 王仲, 陈曦, 路瑞军


(天津大学 精密测试技术及仪器国家重点实验室, 天津 300072)


摘要:由于传统检定系统无法准确标定在零点位置具有可移动尺钩结构的部分钢卷尺的零位误差, 提出了一种基于机器视觉的测量系统来完成钢卷尺零位误差的标定方法。 结合钢卷尺钩量与顶量两种方式, 设计了双基准面结构配合双基准线作为标准量, 对比标准量与待测尺上尺头零位到500 mm刻线之间示值距离的差值, 实现了零位标定。 线纹比对依托机器视觉实现, 将图像处理过程结合双基准线计算了浮动像素当量值。 实验结果表明, 本方法的零位误差标定结果重复性可达0.006 mm, 满足国家标准钢卷尺检定规程要求。 


关键词:零位标定; 零点刻线对准; 可移动尺钩结构; 双基准面与双基准线; 浮动像素当量


引用格式:LI Yi-ming, WANG Zhong, CHEN Xi, et al. A novel method of steel tape zero calibration. Journal of Measurement Science and Instrumentation, 2018, 9(2): 103-108. [doi: 10.3969/j.issn.1674-8042.2018.02.001]



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