Liquid crystals were chosen because their strong birefringence provides a simple way to observe their rotation around the laser beam axis.
选择液晶是因为它们强烈的双折射提供了一种简单的方法去观察它们绕着激光光轴的旋转。
When the object is rotating or wiggling, the displacement of Moire fringe indicates the Angle of axis, and the stability of fringe indicates coincidence of the beam axis.
通过试件的旋转或摆动用条纹的移动来反映光束的倾斜，用条纹的稳定性来判断光轴的重合。
By the deflection test, the deflection produced by the deformation of joint field can be gained, accordingly, the change in the included Angle that the beam axis relative tot...
通过挠度测试，可以求出因节点域变形导致梁发生转动而产生的挠度值，进而可以得到梁柱夹角发生的改变量。
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