Fast tilt measurement based on optical block

Abstract

The tilt aberration will greatly reduce the quality of astronomical observation. The traditional tilt measurement method mainly uses the four quadrant detection method. The accuracy of this method is greatly affected by the signal-to-noise ratio. When the light is weak, the measurement effect is not ideal. In this paper, a method based on optical block method is proposed to measure the tilt angle by using the linear relationship between the change rate of receiver light intensity and the tilt angle. Compared with the traditional tilt measurement method, the calculation is less and the tilt angle can be measured more quickly. Because proposed method only needs a detector on the focal plane to take the tilt measurement in a single direction, and there is no requirement for the spot size, so this method has high utilization of light energy and can realize weak light tilt detection.