Development of Instrumentation to Monitor the Radial Deformation of the Medium around an Underground Opening. Part II. Laser System.

摘要

The instrumentation developed provides unique tools for the study of stability of underground openings particularly where deformation measurements are required very close to a drilled or blasted opening and where extended periods of automatic data recording are needed. The Laser System employs a coarse and fine raster scanning concept to measure relative motion of passive targets. The course scan locates a target within a 1-in. square (approximate) field of view;the fine scan locates the target's position within the 1-in. square. The concept,in theory,should have very good accuracy and repeatability but depends upon the capabilities of the instrument components. Details of the concept are contained in Appendix B.