Deployable hood device for stationary orbit remote sensing camera

Abstract

A deployable hood device for a stationary orbit remote sensing camera belongs to the spaceflight field. The device comprises an optical-mechanical structure body, a multistage hood cylinder, a lockingmechanism and a cord sleeve driving mechanism. The multistage hood cylinder is fixed with the optical-mechanical structure body and achieves the compressed state by the locking mechanism; the stagesof the core sleeve driving mechanism is the same as that of the multistage hood cylinder; the sleeve of each stage of the cord sleeve driving mechanism is in rigid connection with the corresponding stage of the hood cylinder of the multistage hood cylinder, and the multistage hood cylinder achieves multistage sleeve unfolding through the cord sleeve driving mechanism; a main mirror is arranged inthe first stage sleeve of the cord sleeve driving mechanism; and the circumference of each stage of the locking mechanism is uniformly distributed on the corresponding stage of the multi-stage hood cylinder. The compression ratio of the deployable hood device is high; the driving force of the cord sleeve driving mechanism is large and the synchronism is high; the structural rigidity of the whole device in the compressed state is high, and the whole device can bear the vibration impact load during the launching; and the reliability of the locking / unlocking is high, and the locking force is large.

Description

technical field [0001] The invention belongs to the aerospace field, and in particular relates to an expandable shading device for a remote sensing camera with a diameter of 3 meters in a geostationary orbit. Background technique [0002] At present, light shields are widely used in the field of space telescopes and earth remote sensing. The light shields that are conventionally used in space optical systems are no longer deployed. With the increase of optical aperture, this form of light shield is no longer suitable for large-aperture space. Development of optical systems. At the same time, a remote sensing camera operating in geostationary orbit faces a special space environment, and the angle between it and the sunlight changes in a 24-hour cycle. On the one hand, the sunlight directly shining on the light inlet of the camera will introduce stray light, causing the irradiance of the image plane to decrease. , the signal-to-noise ratio of the optical system decreases; on ...

AI Technical Summary

Problems solved by technology

[0002] At present, light shields are widely used in the field of space telescopes and earth remote sensing. The light shields that are conventionally used in space optical systems are no longer deployed. With the increase of optical aperture, this form of light shield is no longer suitable for large-aperture space. development of optical systems

At the same time, a remote sensing camera operating in geostationary orbit faces a special space environment, and the angle between it and the sunlight changes in a 24-hour cycle. On the one hand, the sunlight directly shining on the light inlet of the camera will introduce stray light, causing the irradiance of the image plane to decrease. , the signal-to-noise ratio of the optical system decreases; on the other hand, the introduced heat leads to the destruction of the internal thermal balance, which reduces the imaging quality of the camera. The fairing length of the launch rocket is limited, and the conventional fixed sunshade can no longer be placed inside the rocket. There is an urgent need for an expandable sunshade solution

[0003] To sum up, the expandable hood of remote sensing cameras has received more and more attention, but the related research is relatively lagging behind, and there is no application case of deploying the hood of remote sensing cameras in geostationary orbit.

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