Hartmann-Shack wavefront sensor suitable for variable background for point source target wavefront detection

Abstract

A Shark-Hattman wave front sensor adapted for background variety point source target wave front detection is disclosed that comprises restraint system, lense array, coupling lens array, detector and algorithm optimization module, the electrical signal collected by detector firstly comes into the algorithm optimization module to be processed, and then transferred into post-treatment system, said algorithm optimization module is various solidified fast mass center algorithm and digit hardware module of related algorithm, it can proceed the algorithm preelection based on the background intensity, signal-to-noise ratio is the criterion, when the signal-to-noise ratio is lower than the set criterion value, the related algorithm is chosen, otherwise, the mass center algorithm is chosen to realize the weak and strong background monitoring of adaptive optical system. The invention eliminates the influence of strong detecting background to the detecting accuracy, and has advantages of simple structure, stable working properties, sophisticated machining technology, simplifies the production, installation and adjustment, it is benefit for batch production.

Description

technical field The invention relates to a Shaker-Hartmann wavefront sensor, in particular to a Shaker-Hartmann wavefront sensor adapted to background change point source target wavefront detection. Background technique Shack-Hartmann wavefront sensors have been widely used in adaptive optics systems. The array lens is used to segment the detection wavefront, the divided wavefront is focused on the CCD photodetector, the slope of each sub-aperture is calculated, and the phase distribution of the detection wavefront is obtained through restoration calculation. Shack-Hartmann wavefront sensors are not only used in adaptive adaptive optics systems for various purposes, but also for various static phase difference measurements, such as optical detection, system calibration, and human eye aberration measurement in medicine. This type of traditional Shaker-Hartmann wavefront sensor can be found in "Application of Hartmann Wavefront Sensor", Jiang Wenhan, Xian Hao, etc., Acta Quan...

AI Technical Summary

Problems solved by technology

The above-mentioned Shack-Hartmann wavefront sensors have shortcomings when used for adaptive observation under strong background conditions: when the signal-to-noise ratio is very low, the signal is submerged by noise, and the image obtained by the photodetector cannot be processed without processing. Accurate slope data is obtained. In the Shack-Hartmann wavefront sensor using an image intensifier, while the signal is enhanced, the noise is also amplified, so the signal-to-noise ratio cannot be effectively improved

The Shack-Hartmann wavefront sensor specially developed by using the field of view offset method can effectively suppress the influence of the background on the detection, but its system complexity increases the research cost

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