Du Po, Duan Zhenyun, Zhang Jing, Zhao Wenhui, Lai Engang, Jiang Guozhen
School of Mechanical Engineering, Shenyang University of Technology, Shenyang 110870, China.
Engineering Training Centre, Shenyang University of Technology, Shenyang 110870, China.
Sensors (Basel). 2025 Jun 6;25(12):3576. doi: 10.3390/s25123576.
High-precision measurement of large gear rotation angles is a critical technology in gear meshing-based measurement systems. To address the challenge of high-precision rotation angle measurement for large gear, this paper proposes a binocular vision method. The methodology consists of the following steps: First, sub-pixel edges of calibration circles on a 2D dot-matrix calibration board are extracted using edge detection algorithms to obtain pixel coordinates of the circle centers. Second, a high-precision calibration of the measurement reference plate is achieved through a 2D four-parameter coordinate transformation algorithm. Third, binocular cameras capture images of the measurement reference plates attached to large gear before and after rotation. Coordinates of the camera's field-of-view center in the measurement reference plate coordinate system are calculated via image processing and rotation angle algorithms, thereby determining the rotation angle of the large gear. Finally, a binocular vision rotation angle measurement system was developed, and experiments were conducted on a 600 mm-diameter gear to validate the feasibility of the proposed method. The results demonstrate a measurement accuracy of 7 arcseconds (7") and a repeatability precision of 3 arcseconds (3") within the 0-30° rotation range, indicating high accuracy and stability. The proposed method and system effectively meet the requirements for high-precision rotation angle measurement of large gear.
大齿轮旋转角度的高精度测量是基于齿轮啮合的测量系统中的一项关键技术。为应对大齿轮高精度旋转角度测量的挑战，本文提出了一种双目视觉方法。该方法包括以下步骤：首先，使用边缘检测算法提取二维点阵校准板上校准圆的亚像素边缘，以获得圆心的像素坐标。其次，通过二维四参数坐标变换算法实现测量参考板的高精度校准。第三，双目相机拍摄大齿轮旋转前后附着的测量参考板的图像。通过图像处理和旋转角度算法计算相机视场中心在测量参考板坐标系中的坐标，从而确定大齿轮的旋转角度。最后，开发了双目视觉旋转角度测量系统，并在直径为600毫米的齿轮上进行了实验，以验证所提方法的可行性。结果表明，在0 - 30°旋转范围内，测量精度为7角秒（7"），重复性精度为3角秒（3"），具有很高的精度和稳定性。所提方法和系统有效地满足了大齿轮高精度旋转角度测量的要求。
