1973年11月在北京举办的荷兰工业展览会上展出一种玻璃反射粗光栅。这种直线测量系统在国外已被广泛应用到大型机床和数控机床上。 这种系统的特点是:在工作过程中可不受油污、灰尘、冷却液和切屑等脏物污染的影响;安装简便,读数头或光栅尺均可很方便的装设在机床移动部件的任 A glass reflection coarse grating was exhibited at the Dutch Industrial Exhibition held in Beijing in November 1973. This linear measurement system in foreign countries has been widely applied to large machine tools and CNC machine tools. The characteristic of this system is that it is not affected by the pollution of the dirt such as oil, dust, coolant and chips during the working process. It is easy to install and easy to install. The reading head or grating can be easily installed on the moving parts of the machine tool