To address the issues of complex encoding and complex structure of traditional photoelectric encoders

a photoelectric angle sensor based on image recognition is proposed.The light source is rotated by the rotation shaft.The light spot generated by the light source is captured by the camera.The center point coordinates of the light spot are obtained by the least-squares circle fitting algorithm.Then the nonlinearity of the angle sensor is compensated by the look-up table method

and the angle of the high-precision Hall angle sensor is used as the reference value to verify the measurement accuracy of the proposed design.The experimental results show that the average nonlinear error is reduced from 11.76% to 7.79%

and the measurement accuracy reaches 2.624.