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Method for detecting surface shape of large-aperture telescope by using phase diversity phase retrieval

A technology of technical detection and phase recovery, which is applied in measurement devices, optical devices, instruments, etc., to achieve the effect of simple hardware structure and low development cost

Inactive Publication Date: 2016-05-18
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0003] In order to solve the problem of detecting the surface shape of the mirror surface of a large-diameter telescope, the present invention provides a method for detecting the surface shape of a large-diameter telescope using the phase difference phase recovery technology

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  • Method for detecting surface shape of large-aperture telescope by using phase diversity phase retrieval
  • Method for detecting surface shape of large-aperture telescope by using phase diversity phase retrieval
  • Method for detecting surface shape of large-aperture telescope by using phase diversity phase retrieval

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Embodiment Construction

[0045] Invention idea of ​​the present invention is:

[0046] Considering that there is such a problem in the pupil surface interference test, a method for detecting spherical mirror shape based on the phase difference phase recovery technology (Phase-DiversityPhaseRetrieval, PDPR) in the focal plane detector proposed by the present invention is based on the focal plane of the optical imaging system. The image wavefront calculation method can use the optical system to image a star or a fixed target in the outside field without changing the optical system or adding an additional detection device, and perform quantitative measurement of the wave phase difference of the optical system in order to evaluate the optical system. The imaging quality of the system can also be used for the auxiliary adjustment of the field optical system (especially the optical adjustment of the secondary imaging system). Wave-front sensing (Wave-frontSensing, WFS) ability is to evaluate the phase recov...

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Abstract

The invention relates to a method for detecting the surface shape of a large-aperture telescope by using phase diversity phase retrieval. The method comprises the following steps of: representing a 2-bit variable by using a 1-bit variable in order to representing an imaging relation of an optical system; expanding a wave aberration into a series, solving a transfer function by using self-correlation operation of a pupil function and changing a Zernike coefficient so as to obtain different transfer function calculating results, comparing the transfer function calculating results with a transfer function result acquired from the Fourier transform of a measured point spread function, using a minimum mean square error result as a solution; and solving an evaluation value E. The method for detecting the surface shape of a spherical mirror on the basis of phase diversity phase retrieval in a focal plane detector is low in development cost, simple in hardware, susceptible of influences of environment (especially vibration), and capable of dynamically detecting optical elements and systems.

Description

technical field [0001] The invention relates to the application field of detecting the surface shape of a mirror surface of a large-diameter telescope, in particular to a method for detecting the surface shape of a large-diameter telescope by using a phase difference phase recovery technology. Background technique [0002] The wave aberration of the optical system is an important index to measure the imaging quality of the optical system. The traditional interference test based on the pupil plane can directly detect this parameter index. However, interference inspection requires a reference plane mirror and special interferometer equipment, which is unrealistic for inspection under field conditions. In addition, large-aperture optical systems usually have a long focal length and adopt a secondary imaging method. It is generally difficult to use interference detection methods for secondary imaging systems. For large-aperture telescopes, there is no direct letter measuring in...

Claims

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Application Information

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IPC IPC(8): G01B11/24
CPCG01B11/24
Inventor 马鑫雪王建立赵金宇王斌
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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