In this article, a rapid and precise position measurement method based on joint spatial phase is studied for linear motors. First, a low-cost mover position measurement system is designed on the basis of motion characters of linear motors. The target image is an aperiodic fence stripe. The image sequences with the movement of the mover are recorded quickly by linear charge coupled device (CCD) camera. Second, spatial domain algorithm is introduced for the rough registration, and according to the registration results, the overlapping regions are extracted to form two new images, and then the improved phase difference method is used to get the accurate displacement of the two new images. The actual mover displacement is finally calculated by the calibration coefficient of the system. Simulation and experimental results show that this method proposed takes approximately 2 ms on average, and the measurement accuracy reaches 0.02 mm.

中文翻译：

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基于联合空间相位法的直线电机动子快速精密位置测量


本文研究了一种基于关节空间相位的直线电机快速精确位置测量方法。首先，根据直线电机的运动特性，设计了一种低成本的动子位置测量系统。目标图像是非周期性栅栏条纹。线性电荷耦合器件（CCD）相机快速记录动子移动的图像序列。其次，引入空间域算法进行粗配准，根据配准结果提取重叠区域形成两幅新图像，然后利用改进的相位差法得到两幅新图像的精确位移。最终通过系统标定系数计算出实际动子位移。仿真和实验结果表明，该方法平均耗时约2 ms，测量精度达到0.02 mm。