A precise temperature control method for optical remote sensors based on optimal thermo-optical image quality
An optical remote sensor and thermal optics technology, applied in the field of space optical remote sensing, can solve the problems of image quality impact, resource demand waste, large design margin, etc., to avoid design margin, low cost, and reduce the total temperature control work consumption effect
Active Publication Date: 2015-08-05
BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
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Problems solved by technology
However, for optical systems with large apertures and reaching the optical diffraction limit, small temperature gradients will affect the imaging quality
From the perspective of optical design, it is difficult to directly put forward accurate and reasonable temperature requirements for thermal control with such high precision
In this way, it will be difficult to use the temperature control method with temperature as the final index.
In addition, the temperature control requirement will inevitably introduce a large design margin in the process of index decomposition, which will result in waste of resource requirements and over-design
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[0016] Specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0017] The temperature control principle of the present invention is to utilize the characteristic that the optical-mechanical-thermal coupling of the optical remote sensor has a significant influence, and the influence of the temperature T of each key component on the optical imaging quality Q of the system is described as a function: Q=f(T 1 , T 2 ... T i ... T n ). Obtain the thermal-optical sensitivity coefficient dQ / dT of this function by experiment or simulation analysis method i , its unit is: λ / ℃, λ is the wavelength. as a temperature-adjusted gradient. When controlling the temperature, first interpret the imaging quality such as wavefront aberration detected by the wavefront detector, and then calculate the temperature control target of each temperature control point according to the sensitivity coefficient table, and the...
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The invention discloses an optical remote sensor precise temperature control method based on thermo-optical image quality optimization. A phase difference method wavefront detector suitable for target extension completes wavefront detection for an optical remote sensor under an earth observation mode, and a wavefront aberration is obtained; according to the detected wavefront aberration and a thermo-optical sensitivity analytical statement, the temperature control target value of a key temperature point is determined, and the sensitivity coefficient dQ / dTi of the key temperature point for the wavefront aberration is stored in the thermo-optical sensitivity analytical statement; the temperature deviation is calculated according to the temperature measured value and the temperature control target value, and the temperature is controlled according to the temperature deviation until the temperature control target value is reached. According to the method, it is the first time that the final thermo-optical image quality serves as the temperature control target, the system image quality can be effectively guaranteed, and multistage remains led in due to decomposition of temperature indexes can be avoided.
Description
technical field [0001] The invention belongs to the technical field of space optical remote sensing, in particular to a method for precise temperature control of a large-diameter optical remote sensor. Background technique [0002] With the continuous improvement of the resolution and imaging quality requirements of aerospace optical remote sensors, remote sensors have a tendency to develop towards long focal lengths and large apertures. However, the imaging quality of the optical system with long focal length and large aperture is more sensitive to the temperature change inside the remote sensor and the space environment, which makes the change of the temperature field become one of the most important factors affecting the imaging quality of the optical system. At the same time, when the remote sensor flies in orbit, it will encounter external heat flow such as solar radiation, earth reflection, earth infrared, and the alternating heat of cold and dark space, causing temper...
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IPC IPC(8): G05D23/30
Inventor 于波李春林王兵程少园王小勇赵振明赵宇杨涛
Owner BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH