Kim B J, Song J S, Kim J T, Jo J H, Chang S, Yuk K C
Appl Opt. 1997 May 1;36(13):2848-55. doi: 10.1364/ao.36.002848.
We investigate the properties of the moiré fringes of matched radial-parallel (MRP) gratings that are useful for the fine visual indication of angular displacements. Moiré patterns formed by overlapping two different MRP gratings of angular pitches, P(theta) and P(theta)? (<P(theta)), can provide a simple fringe-counting method for determining both the angle and the direction of the relative angular displacement of the gratings within the accuracy of (P(theta)?/M(theta)), where M(theta) is the angular magnification for radial vernier fringes.
我们研究了匹配径向平行（MRP）光栅的莫尔条纹特性，这些特性对于角位移的精细视觉指示很有用。由两个不同角间距P(θ)和P(θ)？（<P(θ)）的MRP光栅重叠形成的莫尔图案，可以提供一种简单的条纹计数方法，用于在（P(θ)？/M(θ)）的精度范围内确定光栅相对角位移的角度和方向，其中M(θ)是径向游标条纹的角放大倍数。
