A Thermal Stability Calibration Method for Mirrors of Space Optical Remote Sensing Cameras
A space optical remote sensing and thermal stability technology, applied in image analysis, instrumentation, design optimization/simulation, etc., can solve the problem of insufficient consideration and inaccuracy of the factors affecting the thermal stability of the mirror, and incomplete calibration of the thermal stability of the mirror, etc. problems, to achieve a good effect of guiding the structure and thermal control design
Active Publication Date: 2022-02-11
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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[0003] In order to solve the problem of incomplete and inaccurate calibration of the thermal stability of the mirror due to insufficient consideration of the existing factors affecting the thermal stability of the mirror, the invention provides a thermal stability calibration of the mirror of the space optical remote sensing camera. Standard method
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[0026] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.
[0027] A thermal stability calibration method for space optics remote sensing camera mirrors, such as figure 1 , including the following steps:
[0028] Step 1. Establish the finite element model of the space optics remote sensing camera mirror according to the structure model of the space optics remote sensing camera mirror. Test, through the convergence test of the grid to determine the grid density of the finite element model.
[0029] According to the structural model of the space optical remote sensing camera mirror, a high-precision finite element model of the space optical remote sensing camera mirror is established in hypermesh (high-performance finite element processor), such as Figure 2-5 shown. When meshing, hexahedral elements or shell elements are preferred. The invention determines the grid convergence density through the gr...
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A thermal stability calibration method for space optical remote sensing camera mirrors relates to the field of optical remote sensing camera integrated simulation technology, which solves the problem of incomplete and inaccurate calibration. The steps are: 1. Establish a finite element model, divide the grid and determine Mesh density; 2. Use Zernike polynomials to characterize and obtain thermal expansion coefficient distribution and temperature field distribution; 3. Temperature field distribution is used as load, and thermal-mechanical coupling finite element analysis is performed to obtain the displacement information of the optical surface of the mirror, and the optical-mechanical data interface is written. Obtain the Zernike aberration, surface shape RMS and PV of the space optics remote sensing camera mirror under thermal load; 4. Obtain the verification parameters and modify the parameters of the finite element model; 5. Obtain the modified finite element model and analyze and calculate the space optics respectively Surface RMS sensitivity, PV sensitivity, and Zernike aberration sensitivity of remote sensing camera mirrors under different temperature field distributions. The present invention is more comprehensive and accurate than previous methods.
Description
technical field [0001] The invention relates to the technical field of integrated simulation of optical remote sensing cameras, in particular to a method for calibrating thermal stability of mirrors of space optical remote sensing cameras. Background technique [0002] During the operation of the space optical remote sensing camera in orbit, the influence of heat flow outside the orbit makes the camera produce a significant temperature gradient. With the improvement of detection accuracy, the mirror diameter of space cameras is also getting larger and larger. The increase in the mirror diameter not only puts forward higher requirements for support design and lightweight design, but also has stricter requirements for the temperature adaptability of the mirror. SiC material has high specific stiffness, good thermal conductivity, and is easy to reduce weight, but its thermal expansion coefficient is relatively large, resulting in extremely high temperature sensitivity, especia...
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IPC IPC(8): G06T7/80G06F30/23
CPCG06T7/80
Inventor 杨勋李晓波赵阳姜禹希班章
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI