Design of grating encoder displacement measurement system

Abstract In this paper, by combining TMS320F28335DSP and the grating encoder, the 4× frequency count of the grating encoder displacement measurement is realized, which improves the accuracy of the displacement measurement. Moreover, the human-computer interaction with the developed host computer is carried out through RS232 serial communication to display the displacement. At the same time, the system realizes the positive and negative rotation of displacement measurement by judging the increase and decrease of the pulse signal. Specifically, firstly, two pulse signals output by the grating encoder are preprocessed, and the analog signal is converted to the digital signal. The DSP microprocessor is used for pulse counting, direction recognition, and displacement correlation calculation, and the human-computer interaction is carried out through serial communication. The experimental results show that the method has stable data transmission, accurate measurement value, and improved accuracy of encoder displacement measurement.