Maladjustment error correction method for large-aperture and large-field-of-view telescope

An error correction and telescope technology, which is applied in the field of integrated adjustment of telescope systems, can solve problems such as cumbersome implementation process, complex algorithm, and complex calculation process, and achieve the effects of wide application range, reduced algorithm complexity, and simplified measurement system

Active Publication Date: 2020-10-02
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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Problems solved by technology

Due to the cumbersome implementation process and complex algorithm, the undersampling image reconstruction technology cannot be directly applied to the online and closed-loop correction process of the telescope misalignment error
At present, the misalignment error correction technology of large aperture and large field of view telescope mainly adopts direct wavefront detection me

Method used

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  • Maladjustment error correction method for large-aperture and large-field-of-view telescope
  • Maladjustment error correction method for large-aperture and large-field-of-view telescope
  • Maladjustment error correction method for large-aperture and large-field-of-view telescope

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[0036] Example 1:

[0037] The RC optical system with a clear aperture of 4m and F#=3 is used for simulation analysis. The system parameters are shown in Table 1, and the selected field of view is as follows figure 2 Shown.

[0038] Table 1 Some parameters of the telescope system

[0039] System parameters Radius Semi-diameter Conic PM-120002000-1.004 SM -2125330-1.626

[0040] Taking the central wavelength as 0.55μm, the full width at half maximum of the Airy disk corresponding to the optical system is:

[0041]

[0042] Assuming that the pixel size of the selected detector is 15μm, take the under-sampling magnification factor Q:

[0043]

[0044] It can be seen from the above results that the under-sampling magnification of the under-sampling image obtained by the optical system on the detector is seriously under-sampling imaging because Q=18. The under-sampling imaging spot shape of the optical system in the ideal imaging state is as follows image 3 Shown. For large-diamete...

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Abstract

The invention relates to a maladjustment error correction method for a large-aperture and large-view-field telescope. The method comprises the steps of: (1) collecting under-sampling imaging light spots of on-axis and off-axis view fields by using a far-field detector; (2) performing target extraction and view field matching on the imaging light spots of each view field on the axis and outside theaxis; (3) calculating an image definition function of the under-sampling imaging light spots of each view field in an initial maladjustment state; (4) calculating a new secondary mirror position by using an optimization algorithm, and changing the secondary mirror position through a six-degree-of-freedom driver; (5) acquiring far-field under-sampling imaging light spots of each view field again,performing target extraction and view field matching, and calculating an image definition function of the light spots of each view field; and (6) judging whether the correction result meets a termination condition or not, if yes, ending the correction process, and otherwise, repeating the steps (4)-(6). According to the invention, on the basis of the image definition function of the far-field under-sampling imaging light spots, the online, closed-loop and high-precision correction process of the maladjustment error of the large-aperture and large-view-field telescope can be realized by using an optimization algorithm.

Description

technical field [0001] The invention relates to the field of integrated assembly and adjustment of telescope systems, in particular to a method for correcting misalignment errors of large-aperture and large-field-of-view telescopes based on the sharpness function of far-field undersampling imaging spot images. This method is suitable for the online adjustment of the telescope optical system whose imaging spot is under-sampled. Background technique [0002] In order to detect farther and fainter targets, the aperture and field of view of telescopes are constantly increasing. However, during the working process of the telescope, affected by factors such as gravity, wind load, vibration, and temperature changes, the relative positions of its optical mirrors will change, and misalignment errors will be introduced into the system, making the imaging quality unable to meet the use requirements. At present, the online correction technology of the system misalignment error of the l...

Claims

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Application Information

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IPC IPC(8): G02B27/00G02B23/12G01M11/02
CPCG02B27/0025G02B23/12G01M11/0257
Inventor 鲜浩李敏张昂
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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