光栅数 meaning in English

raster count

The design and solution of grating digital display system
光栅数显系统的设计与实现
Calculating uncertainty of unequal observations of grating constant by least square method
用最小二乘法评定光栅数不等精度测量的不确定度
The software design for the grating numerical indication and computer measurement system of universal measuring microscope
万工显光栅数显微机测量系统软件设计