Linear Array Sensor-Based Vision System for Shaft Radial Vibration Sensing Using Projection Fringe

To adapt the demands of the high-speed and real-time dynamic measurements, a linear array sensor (LAS) and projection fringe-based vision system was proposed to measure the radial vibration of rotating shaft. The projection lamp projects fringe pattern onto the surface of the shaft, and the LAS captures the modulated fringe sequences for tracking the vibration signal using a proposed fringe signal processing method. Simulations using 3-D software were carried out first to verify the feasibility of the method, and the performance of the system was analyzed and investigated by simulations and experiments. In the experiments, the proposed system and the eddy current sensor (ECS)-based system were employed to simultaneously measure the shaft vibration under constant and variable rotating speed conditions for comparison. The result showed that the system can measure the radial vibration of the rotating shaft accurately using 1-D fringe signal. The LAS-based system has the advantages of high accuracy, low cost, and small data for processing, which makes it suitable for vibration monitoring and fault diagnosis for rotating shaft.