Self-adapting calibration apparatus of Hartmann wave-front sensor based on four-quadrant detector

Abstract

The invention discloses a self-adapting calibrating device of a Hartmann wavefront sensor that is based on a four-quadrant detector, comprises a spectroscope, a calibrating distortion lens, a micro lens array, a matching lens, a four-quadrant detector array, a wavefront processor and a wavefront controller, and is characterized in that the calibrating distortion lens is used for changing facula positions on a photosurface of the four-quadrant detector, leading facula centroid and center of the four-quadrant detector to be coincided, and consequently eliminating system error; surface shape of the calibrating distortion lens is kept the same, and a loop closed ring and a wave front to be calibrated are calibrated. The self-adapting calibrating device of the Hartmann wavefront sensor adopts the calibrating distortion lens for changing the facula positions and leading the facula centroid and the center of the four-quadrant detector to be coincided, and consequently eliminating sampling error that is brought by the system error; the self-adapting calibrating device has simple structure, stable working condition and easy technical implementation; compared with the prior art, the self-adapting calibrating device can reduce calculation amount and provides conditions for the calibration of weak object wavefront signals with high precision and high frame rate.

Description

technical field The invention relates to a calibration device for a Hartmann wavefront sensor, in particular to an adaptive calibration device for a Hartmann wavefront sensor based on a four-quadrant detector. Background technique Due to its simple structure and straightforward principle, the Hartmann wavefront sensor is used in modern adaptive optics to detect the distortion of the observed wavefront in real time. It is a wavefront measurement instrument based on wavefront slope measurement, which is composed of microlens and photoelectric sensor. It can perform high-resolution detection of the wavefront phase of the incident signal light, and then perform wavefront reconstruction of the signal wavefront according to a certain wavefront reconstruction algorithm. In order to detect the wavefront phase with high precision, it is more important to calibrate the aberration of the Hartmann sensor itself. The general calibration method is to use a standard plane wave to enter th...

AI Technical Summary

Problems solved by technology

The technical problem to be solved by the present invention is to overcome the disadvantage that the traditional Hartmann wavefront sensor based on four-quadrant detectors cannot accurately provide the direction of wavefront distortion when the light spot changes randomly due to the influence of sampling error brought by the system error. A calibration deformable mirror is added in front of the Hartmann wavefront sensor, and the position of the spot is changed by using the calibration deformable mirror, so that the center of mass of the spot formed by the calibration plane wave coincides with the center of the four-quadrant detector, thereby eliminating system errors

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