A study was conducted on the main four double-sided mirrors in a coaxial total reflective lens for a certain long wave infrared imaging. Two schemes of double-sided mirrors were designed to meet the weight reduction requirements, and a lightweight design was carried out for the double-sided mirrors; Modal analysis was conducted on two types of double-sided mirrors, indicating sufficient stiffness and good resistance to gravity deformation; Analyzed the mirror surface shape under pre tightening force of screws, indicating that double-sided mirrors have good deformation resistance; Option one was selected for the processing and testing of the reflector, and the surface RMS and PV met the design requirements; Finally, a random vibration test was conducted on the imaging system containing a double-sided mirror, and the visual axis jitter was within the specified range, indicating that the designed lightweight double-sided mirror meets the requirements for use.
In order to solve the problem of high-cost of the vehicle-assisted driving system and satisfy the requirements of highimaging-quality, the vehicle-mounted infrared optics is light, small, low-cost and mass-produced. In this paper, a compact single-piece free-from prism is used to achieve in-vehicle thermal imaging optical system with waveband of 8~12um, field-of-view of ±14°×±10.5°, F-number of 1 and focal length of 16mm. The optics has a compact structure similar to two-mirror off-axis system, and has the same characteristics with refractive optics of high-quality and low difficulty in installation. Through the process improvement method, the use of molding technology can further reduce the cost of lens, especially suitable for large-volume small-aperture optical systems.
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