Satellite remote sensing camera focusing device and focusing method

Abstract

The invention provides a focusing device and a focusing method for a satellite remote sensing camera. The device includes a focusing ring component and a motion transmission component for enabling the lens focusing ring to move in a small-step plane. The focus ring component and the motion transmission component cooperate with each other to realize accurate small-scale focusing of the lens focus ring. When the temperature change of the space environment on the satellite causes the focal plane to defocus, the focus device can precisely adjust the focal length of the remote sensing camera. To realize clear imaging of satellite remote sensing cameras, the device has the advantages of simple structure, convenient operation, and high focusing precision. The occurrence of over-focusing problems is avoided.

Description

technical field [0001] The invention relates to the field of aerospace technology, in particular to a focusing device for a satellite remote sensing camera and a focusing method thereof. Background technique [0002] Satellites are subject to severe shocks and vibrations during launch. The space camera mounted on the satellite will change its optical interval due to shock and vibration, for example, the distance between the primary mirror and the secondary mirror will change, and the correction mirror will move in its axial direction. These changes will cause the relative displacement of the optical focusing plane and the detection plane of the CCD (Charge Coupled Device) camera. Changes in the radius of curvature, thickness, etc. of the on-orbit camera lens will eventually lead to defocusing of the focal plane of the on-orbit camera lens, which will seriously affect the imaging quality of the on-orbit CCD camera. [0003] The power transmission forms in traditional focusi...

AI Technical Summary

Problems solved by technology

[0004] 1) The assembly of the screw nut transmission device is cumbersome, and it is easy to get stuck between the screw and the nut when working on the rail;

[0005] 2) The size of the worm gear transmission is large, which is not suitable for the requirements of on-board devices;

[0006] 3) The machining accuracy of the cam curve of the cam transmission device is high, the processing is difficult, the cost is increased, and the probability of device instability is increased

However, this control method is complicated in technology and low in reliability, which greatly increases the difficulty of developing the micro-satellite focusing device.

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