双视场多通道成像仪的光机结构

Opto-mechanical structure of imager with two field of views and multiple channels

针对环境适应性和探测精度的要求,设计了双视场、多通道成像仪的光机结构,以获取高空间、时间覆盖和高垂直分辨率的大气图像和数据信息。根据光学探测和光学定位精度的要求,设计的光学系统结构以及对应的机械结构采用了天底和临边多方位观测模式。该结构通过柔性系统保证了成像仪在45°C的温差范围内能够正常工作。由于温差较大,系统中构建了CCD探测器裸片的精密定位与散热系统。为验证光机结构设计的正确性,对集成后的成像仪进行了光学系统性能检测。检测实验显示,边界温度状况下3个光学通道的分辨率均优于4km,达到对地球临边和天底大气进行探测的需求。成像仪的质量为8.3kg,其一阶基频大于100 Hz,最大应力为52.5 MPa。该光机结构设计合理、紧凑,满足刚度、强度以及目标探测要求,适合空间遥感的应用。

To get the atmosphere images and data information with high spatio-temporal coverages and high vertical resolution,an opto-mechanical structure for the imager with two field of views and multiple channels was designed based on the environmental adaptability and accuracy requirements.In consideration of detection and position accuracy,a nadir and limb multiple-azimuth observation model was used in the optical system and corresponding mechanical structure.A flexible system was taken to allow the imager to operate at a temperature range of 45 ℃ normally.Duo to a larger temperature range,the precision positioning and cooling system for a CCD bare chip was constructed.To verify the feasibility of the opto-mechanical structure,the performance of the optical system in the imager was tested.The experimental results indicate that the spatial resolutions of the three optical channels are all better than 4km under boundary temperature,which shows the imager can be used in limb and nadir detections.The imager shows its mass is 8.3kg,the first order frequency is greater than 100 Hz,and the max stress is 52.5 MPa.The designed opto-mechanical structure is reasonable and compact,the opto-mechanical structure satisfies the requirements of strength,stiffness and target detection,and it is suitable for the space remote sensing.