In order to achieve high resolution in grating angles measuring system, phase fine division is adopted generally.
为了使光栅测角系统获得较高的分辨率，通常采用鉴相式电子细分。
2
And line grating is used to measure arc length in order to increase Angle measuring precision, thus high differentiate locating in space can be realized.
用长光栅测弧长来实现角度测量的高分辨率要求，实现空间上的高精度定位。
3
Weak modulated dielectric grating can be equivalent to planar waveguide. When it diffracted high-order spatial sub-wave is coupled with waveguide mode, a guided mode resonance is formed.