一种新型钢卷尺零位标定方法（英文）

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500mm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0.006mm,满足国家标准钢卷尺检定规程要求。

A novel method of steel tape zero calibration

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.