Abstract: Laser collimation is increasingly applied to dam deformation monitoring, especially vacuum laser is on favor. However, under a certain condition air laser can do it completely, and the reliability and accuracy of observation is good. Air laser collimation sys-tem has been used to observe horizontal displacement of dam in Liujiaxia Hydropower Station since early1970s and have been working well.Up to now, it realized observation automation instead of artificial observation by much improvement and got a good result.

摘要： 激光准直在大坝变形监测中的应用日益增多,现在大多比较推崇真空激光。但在一定条件下,大气激光也完全可以满足大坝变形监测的要求,其测值的可靠性与精度都比较高。刘家峡从70年代开始采用大气激光准直观测大坝水平位移。20多年来运行正常,经过不断改进完善,现已由人工测读改造为自动化观测,效果良好。