Fig. 1. Measurement principle of mechanical time grating sensor

Fig. 2. Past, present and future of time grating displacement sensors

Fig. 3. Prototype structure of the four kinds of field type time grating sensors. (a) Cylindrical winding magnetic field type; (b) plane magnetic field type; (c) plane electric field type; (d) plane light field type

Fig. 4. 1.8 m diameter large time grating angular displacement sensor made by our team.(a) Stator coil skeleton which is cutting; (b) rotor coil skeleton after installed

Fig. 5. Precision worm gear pair mother machine independently developed by our team