Automatic monitoring system for 3-D deformation of crustal fault based on laser and machine vision

Abstract

An automatic monitoring method of the 3-D deformation is presented for crustal fault based on laser and machine vision. The laser source and screen are independently set up in the headwall and footwall, the collimated laser beam creates a circular spot on the screen, meanwhile, the industrial camera captures the tiny deformation of the crustal fault by monitoring the change of the spot position. This method significantly reduces the cost of equipment and labor, provides daily sampling to ensure high continuity of data. A prototype of the automatic monitoring system is developed, and repeatability test indicates that the error of spot jitter can be minimized by consecutive samples, meanwhile, the environmental correction model is determined to ensure that the system is not disturbed by environmental changes. Furthermore, the automatic monitoring system has been applied at deformation monitoring station (KJX02) of China Beishan underground research laboratory, where a long-term comparative experiment with leveling and laser distance measurement is underway.