A Composite Shaker-Hartmann Wavefront Sensor

Abstract

The invention provides a compound shack-hartmann wave-front sensor. The compound shack-hartmann wave-front sensor comprises corresponding matching systems, a reflecting mirror, optical adjusters, microlens arrays and a charge-coupled device (CCD) detecting camera. The compound shack-hartmann wave-front sensor is characterized in that according to detected targets with different signal-to-noise ratios, the switching reflecting mirror is introduced so that incident light can be guided to two paths of microlens arrays with different subaperture numbers and array images of the detected targets can be imaged on the same area of the same CCD detecting camera through the matching systems, and thereby, aberration detection is accurate. The two paths of array images are imaged on the same CCD detecting camera, and the application of the shack-hartmann wave-front sensor can be widened without remarkable increasing of hardware costs. According to the compound shack-hartmann wave-front sensor, the application potential is achieved in the field of optical detection and adaptive optics.

Description

technical field [0001] The invention relates to a composite Shaker-Hartmann wavefront sensor, which belongs to the field of adaptive optics. Background technique [0002] The adaptive optics system detects and corrects the wavefront distortion caused by time-varying external disturbances in real time, thereby improving the resolution capability of the imaging system. The wavefront sensor is the "eye" of the adaptive optics system, and its wavefront detection performance have a significant impact on the entire system. For the Shack-Hartmann wavefront sensor, the number of sub-apertures of its microlens array is directly related to the accuracy of wavefront measurement. From the perspective of spatial resolution, the more the number of sub-apertures, the higher the measurement accuracy. For the same detection target, the more sub-apertures of the microlens, the lower the signal-to-noise ratio of the detection array image, thus affecting the wavefront measurement accuracy. ...

AI Technical Summary

Problems solved by technology

For the Shack-Hartmann wavefront sensor, the number of sub-apertures of its microlens array is directly related to the accuracy of wavefront measurement. From the perspective of spatial resolution, the more the number of sub-apertures, the higher the measurement accuracy. For the same detection target, the more sub-apertures of the microlens, the lower the signal-to-noise ratio of the detection array image, thus affecting the wavefront measurement accuracy

[0003] The traditional Shack-Hartmann wavefront sensor has a fixed number of microlenses and sub-apertures. When measuring the wavefront of detection targets with different signal-to-noise ratios, if the number of sub-apertures is too small, the spatial resolution is not enough, resulting in wavefront measurement The accuracy is limited. If there are too many sub-apertures, the SNR of the array image formed by the sub-apertures will be too low for detection targets with low signal-to-noise ratio, which will also affect the accuracy of wavefront measurement.

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