| Normally, dam project means substantive invest and mint social and economical benefit, but at the same time, it means huge potential disaster risk. All the countries have pay attention to the risk and have spared no effort to reduce it. Dam safety control system is the basic segment, dam health monitoring system is essential way to realize dam safety control.Deformation monitoring is part of dam health monitoring. Many examples proved that deformaton monitoring is a very effective method on finding abnormal dam states and preventing dam from fatal accident.In this dissertation, we developed an automatic vacuum laser dam deformation monitoring system for Shenwo reservoir located in Liaoning province. The main contents of this dissertation are classfied into three parts:1. We build a classical numerical model of vacuum laser zone-plate diffraction system. Through numerical simulation of the model, we get several important conclusions, totally, the vacuum laser zone-plate diffraction system has good imaging characteristic and is robust to disturbances such as laser beam drift and position error of zone-plate.2. Setup up the system according to the conulusions of numerical simulation. Merits of the system are with high accuracy (0.1mm); vertical and horizontal deformaton measurement simultaneous; automatic and intellectual measurement; totally enclosed, telecommunication and long-range control. Two newly invented technologys, narrow tube technology and laser receiver technology, were proposed and got patented.3. The system was installed in June 2003 and was put into test run since August 2003. During the test run more than one year, the system works stably and accurately. Through analysis of deformation data, a 24 hours deformation period of the dam has been found which can be used as a new possible way to increase dam safety control level.After test run, the system has passed test in October 2004 and received good comments from the reservoir administration. |
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