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A precise measurement method for the focal length of an ultra-long focal length space camera

A space camera and precision measurement technology, which is applied in the direction of testing optical performance, etc., can solve the problems of high cost of supporting equipment and low measurement accuracy, and achieve the effects of wide coverage of the focal length of the measurement camera, low measurement cost, and reduced time for optical path debugging

Active Publication Date: 2017-02-22
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0010] The present invention provides a precision measurement method for the focal length of an ultra-long focal length space camera to solve the existing problems of low measurement accuracy and high cost of supporting equipment when measuring the focal length of a long focal length camera

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  • A precise measurement method for the focal length of an ultra-long focal length space camera
  • A precise measurement method for the focal length of an ultra-long focal length space camera
  • A precise measurement method for the focal length of an ultra-long focal length space camera

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specific Embodiment approach 1

[0022] Specific implementation mode one, combination Figure 1 to Figure 3 In this embodiment, the precise measurement method of the focal length of an ultra-long focal length space camera is described. The measurement equipment used in the method includes a 4D interferometer 9, a 4D interferometer spherical standard mirror 10, a plane mirror 11 and a reference ruler 12; the measurement process is:

[0023] 1. First, measure the radius of curvature of the standard lens of the 4D interferometer with a high-precision spherical lens, and then measure the thickness of the standard lens of the interferometer with a mirror locator (lenscan), and calculate the focal length of the standard lens of the interferometer through zemax software. The accuracy of the value (100mm as an example) can reach 5μm. According to the measurement accuracy of the traditional magnification method, the accuracy value of this focal length can reach 200μm. Here, the focal length value of the standard lens of...

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Abstract

A precision measurement method for the focal length of an ultra-long focal length space camera relates to the technical field of optical measurement methods, and solves the existing problems of low measurement accuracy and high cost of supporting equipment when measuring the focal length of a long focal length camera. The invention uses a spherometer to measure the spherical standard mirror of an interferometer radius of curvature, use a mirror locator to measure the lens thickness of the standard mirror, and calculate the focal length of the interferometer spherical standard mirror according to the obtained radius of curvature and lens thickness; Place it on the two-dimensional adjustment platform; place the camera under test, plane mirror and reference ruler in front of the interferometer and perform coarse adjustment and fine adjustment of the plane mirror; make the interferogram of the camera under test image on the detector of the interferometer; use four The quadrant analysis method calculates the imaging on the detector to obtain the length of the image of the reference ruler; according to the focal length of the dry standard mirror, the length of the reference ruler and the length of the reference ruler image, the focal length of the camera under test is obtained.

Description

Technical field [0001] The invention relates to the technical field of optical measurement methods, in particular to a method for measuring the focal length of an ultra-long focal length camera. Background technique [0002] At present, in the fields of space-to-ground remote sensing and space photography, both military and civilian fields are striving to develop high-resolution space cameras. When the space camera orbit height and the CCD pixel size are constant, increasing the focal length can improve the resolution of the pixel on the ground, but as the focal length increases by nearly 10m, there is currently no matching detection equipment that can accurately measure the focal length. [0003] The Hubble Telescope, a cooperative project of NASA and ESA, has a focal length of 57.6m. The James Webb Space Telescope (James Webb Space Telescope, abbreviated JWST), developed in cooperation with NASA and the European Space Agency (ESA), has a focal length of 108m. The Chandra X-ray ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M11/02
Inventor 马洪涛金辉韩冰李旭周兴义
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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