Abstract
Time grating is a novel displacement sensor with new principle which employs time to measure space. This sensor avoids relying on the precise mechanical spatial division technology to realize precise measurement which challenges the traditional view of measuring space by precise mechanical spatial division. Research on a forecast method of dynamic angle measurement for full closed loop numerical control rotary table based on time series is presented. Forecast angles are derived from series of previous angles before corresponding sampling time point comes. Then forecast incremental angle can be converted into continuous pulses to sent out with PWM technology. Original absolute angular displacement signal of time grating sampled during equal time interval can be applied for general incremental numerical control system. And the forecast errors can be corrected in real time. The accuracy of incremental time grating signal can reach ±3″which proves dynamic model validity.
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