Telescope Automatic Focusing Method Based on Interstellar Arc Length Variation

An automatic focusing and telescope technology, applied to telescopes, instruments, installations, etc., can solve problems such as low work efficiency, excessive focus, and large amount of calculation

Active Publication Date: 2022-04-15
SHANGHAI ASTRONOMICAL OBSERVATORY CHINESE ACAD OF SCI
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  • Abstract
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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 Interstellar Arc Length Variation
  • Telescope Automatic Focusing Method Based on Interstellar Arc Length Variation
  • Telescope Automatic Focusing Method Based on Interstellar Arc Length Variation

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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 an automatic focusing method of a telescope based on the change of the arc length between stars, which includes adjusting the focus position of the telescope and the image acquisition device and collecting the sky area image with the adjusted focus; dividing the image and counting the pixel measurements of the center of each area Coordinates and celestial coordinates; Calculate and count the scale of each block center from the pixel measurement coordinates and celestial coordinates of each block center; Record the reference scale of each block center for later focusing; The real-time scale of the center of each block is calculated by the coordinates; the focusing direction and size are determined by the difference and proportional relationship between the real-time scale and the reference scale; the telescope continuously receives the size and direction of the focusing amount of the latest collected images, and performs the focusing operation to realize the real-time telescope. Auto focus. The above technical solutions can effectively solve the problems of the existing focusing methods that have a large amount of calculation, low work efficiency, and are prone to overgeneralization and excessive focusing.

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...

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Application Information

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Patent Type & Authority Patents(China)
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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