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图1说明光学平行平板平行度测量的原理。一台低功率氦-氖激光器所发出的光束,入射到楔板表面上,此楔板放在同基面胶牢的三个滚珠的上面。使楔板上表面反射的光束射向屏幕,并记录下光点的位置。现在再把楔板旋转
Figure 1 illustrates the principle of optical parallel plate parallelism measurement. A beam of light from a low-power helium-neon laser impinges on the surface of the wedge, which rests on top of the three balls glued to the base. The wedge on the surface of the beam reflected toward the screen, and record the location of the light spot. Now turn the wedge again