Sine modulation synchronous measuring device and method for self-adaptive optical system transfer matrix

Abstract

The invention discloses a sine modulation synchronous measuring device and a method for a self-adaptive optical system transfer matrix. The device comprises a fixed star calibrated light source, a primary mirror, a deformed secondary mirror, a collimating lens, a wavefront detector, a wavefront recording unit, a control computing unit, a channel dividing unit, a DA (digital to analog) converter, and a high voltage amplifier. The device is characterized in that the fixed star is directly used as the calibrated light source to synchronously measure all elements of the transfer matrix. By virtue of the sine modulation technology, measuring errors can be effectively reduced, and the measuring signal to noise ratio can be improved; meanwhile, all elements of the transfer matrix are synchronously measured by a sparse matrix manner, so that the same modulation frequency can be multiplexed on different drivers, the measuring time is greatly shortened, the requirement on the system working frequency is reduced, the technology is easy to easy to realize, and the method provides conditions for high-efficiency closed loop operation of the self-adaptive optical system.

Description

technical field [0001] The invention relates to the technical field of adaptive optics systems, in particular to a sinusoidal modulation synchronous measurement device and method for a transfer matrix of an adaptive optics system using a star as a calibration light source. Background technique [0002] The Adaptive Optics (AO) system can correct the wavefront distortion caused by atmospheric turbulence in real time and improve the resolution of the imaging system, so it has a wide range of applications in the fields of astronomical observation and human eye imaging. The AO system usually consists of wavefront detection, wavefront restoration, and wavefront correction. In 1989, in "The NOAO 8-m telescope technical description" Association for University Research in Astronomy, 1989, Vol.2, American astronomer Beckers proposed a new type of telescope secondary mirror as a wavefront corrector for the NOAO 8-m infrared telescope project. Adaptive optics system scheme. This desi...

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Problems solved by technology

Guo Youming and Rao Changhui proposed a method of combining sparse matrix and Hadamard matrix in the Chinese patent "Adaptive Optical System Transfer Matrix Measurement Device and Method Based on Hadamard Matrix Multi-channel Method" (Application No.: 201110322085.1). On the one hand, the transfer matrix On the other hand, the sparse matrix removes the redundant noise signal, which not only further reduces the measurement noise, but also shortens the measurement time of large adaptive optics when the signal-to-noise ratio is high. The measurement period of the transfer matrix of the system saves scientific observation time, but this method still does not solve the obvious disadvantage of being affected by the high-gain low-frequency part of atmospheric turbulence and other noises

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