Precision calibration of time grating turntable is a very important process in process of industrialization

which reflects precision and reliability of time grating turntable. In view of traditional calibration system with laser interferometer

optoelectronic autocollimation

and metal polyhedron

efficiency of manual operation is low

reliability is poor

propose using home-made numerical control box combining with embedded technology

develop a kind of grid turntable automatic calibration system. The system use high-precision HEIDENHAIN RCN8510 circular grating as benchmark instrument

double micro controller and upper PC as foundation

to form double closed-loop control structure

realize real-time and online error correction and compensation. Experimental results show that time grating turntable calibration system adopting double closed-loop control system has high stability

efficiency is improved

and precision of time grating turntable is up to 2. 4 ″.