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据英国《水力发电与河谷开发》1978年第4期报道,澳大利亚珀斯城的安莱·哥当顾问公司制成的激光装置,已成功地测量了直线的上格林德冯坝的挠度,现正在对新建的坎斯特尔山拱坝进行测量。两处均采用三点定线系统。其原因是,用两个远隔的点来规定一条光的轴线。第一点是光源,第二点是成象元件的中心。光源和成象元件一起产生影象,影象从光的轴线外推集中,并可在方格屏幕上接收。屏幕的原点是第三点。当影象与原点恰好重合时,三个点便在一条直线上。在这里,可把光的轴线比做一根在光源轴线上转动的棒,光源周周
According to the British “Hydroelectric Power and Valley Development,” 1978, No. 4, it is reported that the laser device made by Anlaisi Bertaud Consultants, Perth City, Australia, has successfully measured the deflection of a straight upper Grindelwald Dam and is now The new Canterrel Arch Dam is being measured. Both use three-point alignment system. The reason for this is that the axis of a light is dictated by two points spaced apart. The first is the light source and the second is the center of the imaging element. The light source and the imaging element together produce an image which is extrapolated from the axis of light and received on a grid screen. The origin of the screen is the third point. When the image just coincides with the origin, the three points are in a straight line. Here, the axis of the light can be compared to a rod that rotates on the axis of the light source, around the light source