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Telescope automatic focusing method based on inter-star arc length change

An automatic focusing and telescope technology, applied in the field of automatic focusing of telescopes, can solve the problems of low work efficiency, excessive focusing, and large amount of calculation.

Active Publication Date: 2020-10-20
SHANGHAI ASTRONOMICAL OBSERVATORY CHINESE ACAD OF SCI
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Problems solved by technology

[0003] The purpose of the present invention is to provide an automatic focusing method for telescopes based on the change of interstellar arc length, which can effectively solve the problems of large amount of calculation, low work efficiency, and overgeneralization in existing focusing methods

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  • Telescope automatic focusing method based on inter-star arc length change
  • Telescope automatic focusing method based on inter-star arc length change
  • Telescope automatic focusing method based on inter-star arc length change

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Embodiment Construction

[0031] In order to make the objects and advantages of the present invention clearer, the present invention will be specifically described below in conjunction with examples. It should be understood that the following words are only used to describe one or several specific implementation modes of the present invention, and do not strictly limit the protection scope of the specific claims of the present invention.

[0032] The flow chart of this embodiment is as follows figure 1 As shown, the specific implementation is as follows:

[0033] (1) After the telescope and its camera are installed in place, due to the huge deviation between the focal length and the ideal position, manual focus is performed first; when manual focus is performed, image processing software can be used to finely analyze the shape and distortion of the star image and adjust manually to the exact focus position;

[0034] (2) Carry out routine shooting to the denser sky area of ​​star number in the sky (th...

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Abstract

The invention relates to a telescope automatic focusing method based on inter-star arc length change. The method comprises the following steps of: adjusting focus positions of a telescope and an imageacquisition device, and acquiring a sky area image with a set focal length; partitioning the image and counting pixel measurement coordinates and celestial coordinates of the center of each area; calculating and counting the scale of the center of each block according to the pixel measurement coordinates and celestial coordinates of the center of each block; recording the reference scale of the center of each block for later focusing; collecting a newly observed image, and calculating a real-time scale of the center of each block according to the center measurement coordinates and the celestial coordinates of each block; determining the focusing direction and magnitude according to the difference between the real-time scale and the reference scale and the proportional relation; and enabling the telescope to continuously receive the focusing magnitude and direction of the latest acquired image and execute focusing operation to realize real-time automatic focusing of the telescope. According to the technical scheme, the problems that an existing focusing method is large in calculated amount and low in working efficiency, overgeneralization is likely to be caused, and over-focusing is caused can be effectively solved.

Description

technical field [0001] The invention relates to the technical field of automatic focusing of telescopes, in particular to an automatic focusing method of a telescope based on the change of arc length between stars. Background technique [0002] Due to the influence of various factors such as environmental temperature changes and lens deflection caused by changes in telescope pointing, the focal length of the telescope will change, resulting in image quality degradation and scale changes. At present, the conventional focusing method is based on the temperature change and the expansion coefficient of the optical-mechanical material of the telescope, and according to the thermal deformation theoretical model, to realize automatic focusing without feedback. This method is difficult to achieve the ideal effect because it has nothing to do with the image on the focal plane. . In recent years, many fields of microscopy and astrophotography have also proposed a focusing detection m...

Claims

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Application Information

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IPC IPC(8): G02B23/00G02B7/28
CPCG02B23/00G02B7/28
Inventor 齐朝祥于涌
Owner SHANGHAI ASTRONOMICAL OBSERVATORY CHINESE ACAD OF SCI
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