By means of thefraction orders of interference fringe shifted, the number of integral orders of interfer-ence fringe shifted can be counted or the displacement can be measured directly.

• 介绍基于等倾光干涉原理测量位移量中，以最终条纹仪化的小数级次计量整数级次，或直接计量位移量的小数计数理论。