Self-adapting optical system based on differential sensor

Abstract

The invention relates to a self-adapting optical system based on a differential sensor, which is composed of the differential sensor, a main control computer and a wavefront corrector. Aberration to be corrected is reflected or transmitted through the wavefront corrector and overlapped with compensation quantity. After corrected residual aberration is obtained and enters the differential sensor, a charge coupled device (CCD) camera in the differential sensor records +1 stage and -1 stage diffraction images of residual wavefront compensated by the wavefront corrector in real time, and single difference is obtained through an image collection card and differential operation. The main control computer generates a driving signal U of the wavefront corrector according to input signal difference and real-time control algorithm, the driving signal U is applied to the wavefront corrector through a driving circuit of the wavefront corrector to enable the wavefront corrector to generate required compensation quantity, and the real-time closed loop work is repeated in this way to enable the aberration to be corrected to be corrected finally and obtain ideal imaging effects. The self-adapting optical system is simple in light path and easy to achieve, has stronger noise resistant capability and is high in practicability.

Description

technical field [0001] The invention belongs to the field of optical technology, and relates to a novel adaptive optical system, in particular to an adaptive optical system based on a differential sensor (a null sensor). Background technique [0002] Adaptive optics technology can dynamically overcome the influence of various aberrations on the optical system, and is a powerful means to improve the resolution capability of the imaging system and the beam quality of the laser system. A typical adaptive optics system is mainly composed of three parts: wavefront sensor, wavefront controller and wavefront corrector. The wavefront sensor measures the optical aberration of the system, and the wavefront controller calculates the control signal of the wavefront corrector based on the measurement data obtained by the wavefront sensor, and finally corrects the optical aberration of the entire system through the wavefront corrector. The wavefront sensor is one of the key components o...

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Problems solved by technology

The coupling technology between the microlens array of this type of wavefront sensor and the CCD detector is relatively complicated. The inconsistency of the focal length of each unit of the microlens array will affect the accuracy of the sensor. In , it is necessary to ensure that the sub-aperture layout of the Hartmann wavefront sensor corresponds to the layout of the deformable mirror driver according to a certain relationship, otherwise it will affect the stability of the control algorithm and even the entire control system, and it is only applicable to continuous wavefront

[0004] The Chinese patent with the authorization number CN101013195 B discloses an "adaptive optical system based on linear phase inversion". case, and is very sensitive to noise

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