Applications of redundancy technique in signal processing circuit for incremental time grating displacement sensor

The reliability of incremental time grating displacement sensor is analyzed,and the idea and configuration of redundancy are introduced. HW redundancy schemes are presented for its signal processing circuit. By adding moving probe unit and paralleling the signals produced,loss-of-step fault can be prevented. Configuring several circuit modules mentioned above in parallel can further prevent gain-of-step fault. The designed scheme is simulated and the reference data are provided for its reliability design. Results show that both the reliability and the real-time performance of incremental time grating displacement sensor can be improved with appropriate number of moving probe units.