车载长波红外线列扫描成像系统光机结构设计OA

To meet the requirements of operating distance and environmental adaptability for vehicle-mounted optoelectronic systems,an opto-mechanical structure of a long-wave infrared linear array scan-ning imaging system was designed.Based on the optical detection requirement and infrared material con-straints,a catadioptric optical scheme with a protective window was adopted,and a correction lens group was integrated to correct aberrations and achieve dynamic focusing function,enabling the system to work normally within the temperature range of-40℃to+60℃.A flexible window component structure based on engineering plastic was proposed to achieve lightweight while improving sealing and anti-vibra-tion performance.A composite primary optical structure combining an aluminum main mirror chamber and Invar support rods was constructed to effectively suppress thermal deformation caused by wide temperature variation.A multi-degree-of-freedom adjustment mechanism for the secondary mirror was designed to bal-ance alignment accuracy and engineering efficiency.Finite element analysis results show that with a total mass of 28.3 kg,the opto-mechanical structure's first-order natural frequency is 204 Hz,and the maxi-mum stress under rated vibrational load is 53.9 MPa,indicating that the structural dynamic stiffness and strength meet the requirement of vehicle-mounted applications.Laboratory tests show that the system achieves clear target imaging with a Noise Equivalent Temperature Difference(NETD)of 40 mK.In field tests,the system still maintains stable imaging performance at-30℃after undergoing a vibration en-vironment,which verifies the excellent environmental adaptability and engineering practicality of the opto-mechanical structure.