Digital speckle based online water wall stress monitoring method and device

A digital speckle based online water wall stress monitoring method, characterized by including the following steps:

• Arrange an online stress monitoring device on the side of the water wall to be monitored;
• Determine a plurality of monitoring points according to the area of the water wall, and set the motion track of the online stress monitoring device for speckle image acquisition according to the determined monitoring points;
• Acquire the real-time speckle image of each monitoring point in real time after acquiring the initial speckle image of each monitoring point;
• Compare the real-time speckle images with the initial speckle images, and determine whether the stress of the water wall changes according to the comparison results;
• wherein the digital speckle based online water wall stress monitoring method further comprises the following steps when determining a plurality of monitoring points according to the area of the water wall and setting the motion track of the online stress monitoring device for speckle image acquisition according to the determined monitoring points:
• Determine the surface area S0 of the water wall;
• Preset the first preset area S1, the second preset area S2, the third preset area S3 and the fourth preset area S4, and S1<S2<S3<S4;
• preset the number Q1 of first preset monitoring points, the number Q2 of second preset monitoring points, the number Q3 of third preset monitoring points and the number Q4 of fourth preset monitoring point, and Q1<Q2<Q3<Q4;
• Set the number of monitoring points according to the relationship between the surface area S0 and each preset area:
• When S0<S1, select the number Q1 of first preset monitoring points as the number of monitoring points;
• When S1≤S0<S2, select the number Q2 of first preset monitoring points as the number of monitoring points;
• When S2≤S0<S3, select the number Q3 of first preset monitoring points as the number of monitoring points;
• When S3≤S0<S4, select the number Q4 of first preset monitoring points as the number of monitoring points;
• After selecting the number Qi of preset monitoring points i as the number of monitoring points, and i=1,2,3,4, connect Qi monitoring points in series as the motion track of the online stress monitoring device in order to enable the online stress monitoring device to acquire the speckle images of each monitoring point in the motion track in turn.