Grading ring stability monitoring method and device

The invention provides a grading ring stability monitoring method and device, and belongs to the field of grading ring monitoring, and the method comprises the steps: periodically transmitting laser pulses to a grading ring through a laser scanner disposed at a monitoring point position, and obtaining the feedback data of the surface of the grading ring through a receiving lens; extracting key points of the grading ring from the feedback data; determining a monitoring distance between the key point and the monitoring point position according to the feedback data; calculating a calculation distance between the key point and the monitoring point position by adopting a section scanning method; comparing the monitoring distance with the calculation distance to obtain a distance difference between the monitoring distance and the calculation distance; and judging the stability state of the grading ring according to a comparison result of the distance difference and a preset threshold value. Based on laser detection