If the reference mirror has tilt and piston errors caused by phase-shifting, the phase shifts of the pixels along the same interferogram are not a constant, but they are still kept on the same plane.
当相移器存在的相移误差包括位移误差与倾斜误差时，同一幅干涉图诸像素点的相移并不同步，但其相移量在同一平面上。
The interferograms are modulated by the displacements of the virtual point sources of the reference beams due to motion of the small mirror.
这些干涉图被由小平面反射镜运动造成的参考光虚点光源的位移所调制。
A new method for focal length measurement is presented based on the self-reference single plate shearing interferometric technique and compensation of spherical mirror.
基于球面补偿原理和自参考单板剪切干涉技术，提出了一种测量焦距的新方法。
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