The optical system of infrared scanning thermal imager using linear array detector has inherent geometric distortion along the linear array direction of the detector. The reason of scanning distortion is analysed, and the mathematical formula of scanning distortion in the linear array direction is derived by using vector method. The mathematical results show that the distortion D along the linear array direction in the optical system of infrared scanning thermal imager is related to the sway angle θ of the scanning mirror. In order to verify the calculation results, Code V software is used to analyse the optical system of infrared scanning thermal imager, and the distortion of different sway angles is obtained and compared with the theoretical calculation values.
Shipboard helicopter optical landing guidance system can ensure the safety of landing when the helicopter completed missions. Stray light has a great influence on positional accuracy of the optical landing guidance system. In order to improve the imaging quality of the optical system, the sources of stray light in optical landing guidance system were studied in this paper. Moreover, the effects of stray light on the system were analyzed in detail. The model of the optical landing guidance system was established in TracePro software. 16 different off-axis angles were selected to carry out the ray tracing. Through modeling and simulation, the irradiance of stray light in the imaging plane and the point source transmittance (PST) of the system were obtained; And they were used to evaluate the level of stray light. Results show that the PST of the optical landing guidance system can achieve a level of 10-5~10-8 when the off-axis angle is equal to or greater than 49°. At the same time, the solar stray light energy that gets to image plane can achieve a level of 1×10-4W/m2. So the optical landing guidance system can work regularly in this range.
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