Design of Virtual Absolute Optical Encoder’s Angle Measuring System Based on FPGA
Pinkuan Liu · Mechanical & Electrical Engineering Technology · 2012
A virtual absolute optical encoder and decoder system is presented.It has advantages of high precision,compact structure and reliable output.The paper contains the characteristic of the encoder and coding theory,the stable electronic interpolation,and the achievement of high precision address by combining the INDEX signal and the interpolation result through ADC.Finally,it utilizes FPGA to build an embedded system,and achieves a reliable repeatable positioning system.The results show that the whole system can work well with stable and reliable outputs.