Synthetic Aperture Optical Imaging Experimental System for Exoplanet Detection

Abstract

The invention discloses a synthetic aperture optical imaging testing system for extrasolar planet exploration. The system comprises a fixed star-plant light source simulator for outputting two parallel light beams having certain angle difference and luminance difference, a controllable aperture array comprising a plurality of independently-controlled secondary apertures, a focusing imaging modulefor gathering light signals output through the controllable aperture array and sending to a microimaging module, the microimaging module for generating and amplifying an interference texture signal and sending to a data handling module, and the data handling module used for recording interference textures and controlling the controllable aperture array to connect and disconnect the next secondaryaperture combinations, simulating base line variation and performing imaging solution based on the recorded interference textures after the base line variation meets the condition of UV covering afterimaging. According to the system, equivalent aperture space movement is introduced through the controllable aperture array, so that the system simulating complexity and cost can be effectively decreased; in addition, additional error caused by surface type difference in a multi-lens system can be avoided.

Description

technical field [0001] The invention belongs to the technical field of sparse aperture optical imaging, and relates to an optical synthetic aperture imaging test system for exoplanet detection, which is used for ground tests. Background technique [0002] It has always been the dream of mankind to find an environment suitable for human survival beyond the earth, and whether there is life beyond the solar system has always been a subject of human interest. In 1995, Mayor and Queloz of the Geneva Exoplanet Detection Group in Switzerland discovered the first Jupiter-mass planet near a sun-like star (51 Pegasus). This major discovery opened the prelude to the human search for exoplanets . With the discovery of a large number of exoplanets, the detection and theoretical research of exoplanets has become one of the hot fields in international astronomy. [0003] Exoplanet detection methods are divided into indirect detection and direct imaging. The indirect detection methods of...

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Problems solved by technology

[0008] (2) The design of the experimental system must consider the problems of system complexity and realizability

In order to reconstruct the image with high precision, the position accuracy of each imaging subsystem needs to reach 1 / 10λ. Taking 500nm blue light as an example, the position accuracy is about 50nm. If a high-precision turntable is added to the ground experiment system to simulate the movement of the sub-mirror During the project, the jitter of the turntable can reach the order of several wavelengths, which brings very high challenges to the measurement and real-time compensation of optical path difference, and also makes the optical path system extremely complex

With the existing technical conditions, it is difficult to simulate the synthetic aperture optical interference experiment under static conditions, and the difficulty of simulating the dynamic imaging process is even more conceivable

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