A Single-Ring Absolute Encoder Subdivision Method

The basic working principle of single-ring absolute photoelectric shaft encoder is to use light-emitting diode as light source to illuminate the encoder, at the same time using linear CCD as photoelectric signal receiving device and subdivision device. So the essence of single ring absolute encoder subdivision technology is based on line array CCD subdivision technology. This paper proposes a linear CCD subdivision algorithm Based on polynomial interpolation method. By computing the center of the bar code to get value of accurate positioning, this calculates the center of the coded disc line. As a result of the existence of encoder\´s characterization error, this article adopts the average operation of multiple line center position to get the precise localization of encoder center line. So as to achieve the aim of improve the barcode location accuracy, and can realize in the application of engineering to achieve the precision of 1 ".