New Type of Position Encoder with Possibility of Direct Zero Position Adjustment

The pseudorandom encoder as a new type of absolute encoder with only one code track is presented in this paper. It is provided using an especial code technique based on pseudorandom binary sequences. A method for parallel reading of pseudorandom code using linear photodetector array is proposed. The presented solution considerably decreases the basic problem, which is a substantial time needed for the execution of the position measuring. The process of determining the fine and rough position is being divided based on the recorded pseudorandom code. The basic idea is in providing of fast reconstruction of scanned pseudorandom code also in providing conditions for application of yet developed fast code conversions algorithms. Simultaneously a problem of zero position adjustment at encoder installation is considered and a concrete solution in accordance with requests of high technologies encoders is proposed.