A wavefront detection-free adaptive optics system and its fast model-free control method

Abstract

The invention discloses a non-wavefront detection self-adaptive optical system and a quick model-free control method thereof. The method comprises the following steps: firstly constructing a Hadamardmatrix of a system; in each iteration, generating turbulence Zernike multinomial coefficient disturbance vector by utilizing a Hadamard matrix and the non-Kolmogorov turbulence statistical rule; converting the disturbance vector into a deformable mirror control voltage vector; computing an image quality evaluation function value of an image acquired by an imaging system under the effect of the control voltage; and updating the turbulence Zernike multinomial coefficient disturbance vector according to the disturbance vector and the image quality evaluation function value, thereby accomplishingthe iteration. The implementation of the control method is free from using the system model of the non-wavefront self-adaptive optical system, and the transportability is strong; the disturbance vector is determined according to the atmospheric turbulence statistical rule, and is used as an optimizing direction of the turbulence Zernike multinomial coefficient disturbance vector, and the convergence speed is fast; the Hadamard matrix improves the reliability of the method, the realization is more convenient and easy, and the method has significance for improving the performance of the non-wavefront detection self-adaptive optical system.

Description

technical field [0001] The invention belongs to the technical field of control, and in particular relates to a non-wavefront detection adaptive optical system and a fast model-free control method thereof. Background technique [0002] Adaptive optics enables the optical system to automatically adapt to changes in the external environment and maintain a good working condition through real-time correction of the optical wavefront. Adaptive optics without wavefront detection has become one of the research hotspots in the field of adaptive optics due to its advantages of no need for wavefront measurement and reconstruction, simple system structure, low cost, and small size. [0003] The control methods of adaptive optics systems without wavefront detection can be divided into two categories: model-free control and model control. The former adjusts the control amount according to the change of the performance index function by applying a micro-perturbation to the wavefront corre...

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Problems solved by technology

The latter needs to first establish a clear mathematical relationship between the wavefront aberration and the image obtained by the imaging system (called the system model), and then use the wavefront corrector to generate a specific mode of corrected wavefront during correction. The obtained image estimates the coefficients corresponding to the mode components; this type of method has a fast convergence speed, but the correction accuracy is affected by the accuracy of the system model construction, and the portability is poor, because the system model of the adaptive optics system without wavefront detection has a difference

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