Novel co-phase detection method and device for segmented telescope

Abstract

A novel co-phase detection method and device for a segmented telescope are provided. The device comprises a segmented mirror telescope, a collimating lens, a segmented deformable mirror, a 4f system,a first beam splitter, a second beam splitter, a segmented mirror MASK, a Shaker-Hartmann wavefront detector, an imaging system and a control system. A white-light (400nm to 700nm) incoherent patternand a white-light ideal Airy disk pattern are used as a template, a segmented mirror piston error is calculated by using a cross-correlation algorithm, and the segmented mirror piston error is quicklyadjusted by adjusting the segmented deformable mirror. The detection method and a photoelectric detection system have unlimited ranges and high precision and quickly detect and adjust the piston error without increasing the complexity of an existing detection system.

Description

technical field [0001] The invention relates to the field of optical co-phase detection, in particular to a novel co-phase detection method and device applied to segmented splicing telescopes. Background technique [0002] With the continuous development of active optical technology, computer technology, sensor technology and advanced optical processing technology, splicing technology has become the main technical means for the continuous increase of the aperture of large-aperture telescopes. The co-phase detection technology of splicing mirrors is one of the key technologies to ensure accurate splicing and maintain mirror quality. Quantitative measurement data is the basis for guiding the deterministic adjustment of splicing, and is also the fundamental guarantee for high-quality splicing mirror imaging and high telescope angular resolution. [0003] At present, the splicing technology of large-aperture telescopes is a hot topic that the world's technologically developed co...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, there are many methods for detecting the piton error of spliced ​​telescopes, such as phase difference method, curvature sensing technology, wide-narrow-band Shaker-Hartman method, quadrangular pyramid wavefront detector method, dispersion fringes, and dispersion Rayleigh interferometry. , dual-wavelength detection and other methods, but these methods cannot simultaneously achieve large-scale, high-precision, high-energy utilization, and faster detection

[0005] The splicing telescopes currently in operation achieve the purpose of co-phase adjustment by adjusting the piston error of the main mirror of the splicing telescope, but the single splicing sub-mirror has a large aperture inertia and low resonance frequency, which makes the efficiency of co-phase adjustment low

At the same time, even if the telescope achieves fast co-phase detection, it cannot meet the requirements of fast co-phase adjustment for spliced ​​telescopes

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