Wang Qing, Zhang Guohua
Appl Opt. 2023 Feb 10;62(5):1130-1135. doi: 10.1364/AO.474983.
Attitude measurements are important parameters for condition monitoring of precision machines. We develop an angle measurement method based on monocular line scan vision to dynamically measure the attitude of shafts. The proposed measurement system, which consists of a single line scan camera, a parallel laser light source, and a triangular mirror, does not require fixation of a sensor on the shaft. The measurement system uses the line scan camera to capture the projection of the shaft. The light source is diffused by a cylindrical lens to yield parallel directional light. Then the parallel directional light is reflected by a fixed-angle mirror and projected onto the projection plane. The captured image can be considered a discrete time sequence. The attitude measurement principle based on linear monocular vision is derived. A double light-spot centroid algorithm is developed to obtain the centroid coordinates of the projection points. The proposed method is investigated by a simulation and experiment. The proposed method can also monitor the vibration of the shaft. The experimental results prove that the proposed method is effective and highly accurate.
姿态测量是精密机器状态监测的重要参数。我们开发了一种基于单目线扫描视觉的角度测量方法，用于动态测量轴的姿态。所提出的测量系统由单线扫描相机、平行激光光源和三角镜组成，不需要将传感器固定在轴上。该测量系统使用线扫描相机捕获轴的投影。光源通过柱面透镜扩散以产生平行定向光。然后，平行定向光由固定角度镜反射并投影到投影平面上。捕获的图像可被视为离散时间序列。推导了基于线性单目视觉的姿态测量原理。开发了一种双光斑质心算法来获取投影点的质心坐标。通过仿真和实验对所提出的方法进行了研究。所提出的方法还可以监测轴的振动。实验结果证明了该方法的有效性和高精度。
