The absolute zero angle can be defined at the biggest fringeamplitude point, so this method can also achieve absolute angle measurement.
干涉条纹幅度最大点处确定为绝对零角度位置，因此该方法可以实现角度的绝对测量。
2
The authors show that using the half-wave strip method to deduce the bright and dark fringe conditions of Fraunhofer grating diffraction is simpler than the amplitude vector method.