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Long-focus large-field-of-view camera focal plane resetting method

An assembly method and large field of view technology, applied in the field of aerospace remote sensing, can solve problems such as low accuracy and poor repeatability

Inactive Publication Date: 2014-04-16
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of low accuracy and poor repeatability in the process of adjusting the focus by visual reading in the prior art, and propose a method for adjusting the focal plane of a camera with a long focal length and a large field of view. Realize high-precision focal plane adjustment for long focal length and large field of view spatial remote sensing cameras

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Embodiment 1

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] as attached figure 1 , 2 As shown, the device used in the method for adjusting the focal plane of a camera with a long focal length and a large field of view of the present invention includes a collimator 1, a grating 2, an integrating sphere light source 3, a camera 4, a CCD focal plane assembly 5, an image acquisition and processing system 6, A two-dimensional turntable 7 and a vibration isolation platform 8; the collimator 1 and the two-dimensional turntable 7 are placed on the vibration isolation platform 8, the grating 2 is located on the focal plane of the collimator 1, and the integrating sphere light source 3 is located on the Right in front of the grating 2, the CCD focal plane assembly 5 is located on the planned focal plane of the camera 4, the image acquisition processing system 6 is connected to the CCD focal plane assembly 5 through a cable, the c...

Embodiment 2

[0035] The present invention is applied in a photoelectric transmission type space remote sensing camera in China. In this camera, the comparison transfer function test is carried out for the camera system with the focal plane installed and adjusted by the method of the present invention. The contrast transfer function is 0.29, which meets the requirements of the index. It is verified by practical application that the imaging quality of the camera is very good.

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Abstract

The invention discloses a long-focus large-field-of-view camera focal plane resetting method, belongs to the technical field of space remote sensing, aims to solve the problems of low precision and low repeatability by focusing through visual reading in the resetting process in the prior art, and realizes high-precision focal plane resetting of a long-focus large-field-of-view space remote sensing camera. The resetting method comprises the following steps of: finding an imaging position corresponding to the optimized compare transfer function of each charge coupled device (CCD) through computer image processing and camera focusing function, fitting an optimal focal plane, determining the trimming amount of a CCD focal plane component mounting interface according to the focusing amount of each CCD which is focused to the optimal focal plane, and guiding the resetting of the focal plane component. The focal plane given in the resetting method is an optimal imaging focal plane which tolerates a field curvature error of an optical system and a CCD splicing error, and the problem that the long-focus large-field-of-view space remote sensing camera is low in focusing precision and low in stability is systematically solved.

Description

technical field [0001] The invention belongs to the technical field of aerospace remote sensing, and in particular relates to a method for adjusting the focal plane of a camera with a long focal length and a large field of view. Background technique [0002] With the development of the economy and the advancement of science and technology, human beings have higher and higher demands for planetary observation, and long focal lengths and large fields of view have gradually become an important development direction and trend of aerospace remote sensing cameras. In order to achieve wide coverage, the focal plane of this type of camera is generally composed of multiple CCDs interlaced and spliced. Whether the spliced ​​focal plane components can be accurately installed on the actual focal plane of the camera so that each CCD is in the best imaging position is directly related to the final imaging quality of the camera. The traditional fixed focus method is to use a collimator to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C11/02
Inventor 郭疆孙继明邵明东王国良
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI