Single-loop absolute type photoelectric shaft angle encoder based on m sequence codes and design method of single-loop absolute type photoelectric shaft angle encoder

The invention discloses a single-circle absolute type photoelectric shaft angle encoder based on m sequence codes and a design method thereof, belongs to the technical field of angle measurement devices, and solves the problems that an existing single-circle absolute type photoelectric shaft angle encoder is low in resolution and poor in stability in angle measurement. An outer ring channel and an inner ring channel are arranged on a plane, close to the outer edge of the code disc, of the code disc, a coding area is arranged between the outer ring channel and the inner ring channel, m-sequence code stripes are evenly arranged in the coding area, transmission stripes are arranged among the m-sequence code stripes, a light source is further installed on one side of the code disc, and the light source is arranged between the m-sequence code stripes and the transmission stripes. A CMOS image sensor matched with the light source is installed on the other side of the code disc, and the CMOS image sensor is electric