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A Stability Detection Method of Thermal Control Focusing Mechanism

A detection method and stability technology, applied in the field of stability detection of thermal control focusing mechanism, can solve the problems of lack of detection method and image quality influence, and achieve the effect of ensuring effective focusing

Active Publication Date: 2022-06-07
AEROSPACE INFORMATION RES INST CAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the focus ring carries the secondary mirror that is crucial to the optical system, the deformation of the focus ring during the focusing process will affect the position and angle of the secondary mirror, which may affect the image quality
In order to ensure acceptable imaging quality, the deformation of the focus ring must be limited within a certain range, so it is necessary to test the stability of the mechanism of the focus ring, but there is no relevant detection method in the prior art

Method used

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  • A Stability Detection Method of Thermal Control Focusing Mechanism
  • A Stability Detection Method of Thermal Control Focusing Mechanism
  • A Stability Detection Method of Thermal Control Focusing Mechanism

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Experimental program
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Embodiment approach

[0031] (1) The first mirror 2 may be a secondary mirror, can also be a planar mirror, but the secondary mirror is generally spherical or aspherical, not easy to measure, so the first mirror 2 is preferably a flat mirror.

[0032] (2) The standard mirror 3 is a transmission standard mirror, which will also be reflected while transmitting, and the reflection of the transmission standard mirror interferes with the reflection of the first mirror 2.

[0033] (3) The interferometer may employ a zygo interferometer, or other brands of interferometers can be used.

[0034](4) By adjusting the first mirror 2, so that the interference fringes are minimal or disappear, which is related to the face shape of the first mirror 2, the first mirror 2 face type is very good, there may be no stripes, if the first mirror 2 face type is not good, there may be ring stripes. In practical applications, the entire structure of the focusing ring 1 may be placed on the five-dimensional adjustment table of t...

Embodiment 1

[0047] as Figure 1 As shown, a stability detection method for thermally controlled focusing mechanisms, including the following steps:

[0048] Step A1, the sub-mirror mounted on the focusing ring 1 in the thermal control focusing mechanism as the first mirror 2, the incident light direction of the first mirror 2 is set in the same optical axis as the standard mirror 3 and the interferometer 4, so that the parallel monochromatic light emitted by the interferometer 4 is reflected by the standard mirror 3 to form a reference light, after reflection of the first mirror 2 and the reference light interference, the interference fringe is formed; By adjusting the first mirror 2, so that the interference fringes are minimized or disappeared, the temperature of the thermal control focusing mechanism at this time is 20 ° C, the temperature is recorded as the initial temperature, the interference fringe conditions observed from the interferometer field of view at this time, such as Figure 2 ...

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Abstract

The invention discloses a method for detecting the stability of a thermally controlled focusing mechanism, which uses a secondary mirror mounted on the focus ring as the first reflecting mirror, or replaces the secondary mirror with a plane mirror and installs it on the focus ring as the first reflecting mirror. reflector, and set a standard mirror and an interferometer sequentially on the same optical axis as the incident light direction of the first reflector, so that the parallel monochromatic light emitted by the interferometer is reflected by the standard mirror to form a reference light, which is reflected by the first reflector The above-mentioned reference light interferes to form interference fringes; by adjusting the first mirror, the interference fringes are minimized or disappeared; The conditions of interference fringes after temperature are compared to determine the stability of the deformation of the focus ring during the focusing process. The invention can detect the stability of the deformation amount of the focus ring during the focus adjustment process, so as to ensure effective focus adjustment without fatal influence on the image quality.

Description

Technical field [0001] The present invention relates to the field of thermal control focusing mechanism of space camera, in particular to a stability detection method of thermal control focusing mechanism. Background [0002] Spaceborne reflective, large focal length optical cameras usually deviate the sensor from the position of the clear image due to violent vibration during emission, which is called out-of-focus. In order to solve the problem of defocusing the photosensitive chip after the emission into orbit, a focus adjustment mechanism will be added to the camera, and the sensor will return to the position of clear imaging by focusing after the emission into orbit. Application No. 201710302694.8 Chinese patent application discloses a space camera active thermal control focusing device, which is the use of temperature control system to control the length of the focusing ring (the focusing ring is a ring design of the metal structure), the secondary mirror (reflective lens is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M11/00
CPCG01M11/00
Inventor 王建威李伟艳陈鑫雯孙建颖李兵赵娜孙成明谭政刘扬阳吕群波
Owner AEROSPACE INFORMATION RES INST CAS
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