An absolute scale and the auxiliary mounting error compensation method

The present invention is an absolute scale and the auxiliary mounting error compensation method. Including the following: (1) Installation CMOS sensor and the blade when the grating, the CMOS sensor is read two vertical sampling window, due to the presence of the blade angle of the grating and a CMOS sensor, the number of upper and lower windows there will be a difference, continuously adjusting the blade grating or a CMOS sensor, the read code with the smallest difference, to achieve the object of the present zero angle between the blade and the grating CMOS sensor; (2) mounting the blade grating and mechanical housing, in the direction of motion accumulated error introduced by the fixed value of the angle displacement encoder grating and record readings obtained error compensation, the compensation value as an error in the actual movement, the correct scale body and the direction of movement. The present invention can automatically calculate the CMOS sensor and the blade of the grating angle, parallelism error correction, error compensation is also provided in the grating and the reference direction parallel to the blade case where error can not be corrected.