| Citation: | ZHANG Jia-qi, XIA Mao-bin, GUO Yi-bo, GUO Xu. Dynamic response characteristics of mirror-shaped structures in temperature gradient fields[J]. Chinese Optics. doi: 10.37188/CO.2025-0111
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During the ascent of an aircraft to its cruising altitude, the external environmental temperature changes drastically. Simultaneously, the internal stepper motors and bearings continuously generate heat due to the periodic rapid start-stop operations of the scanning mirror turntable in the step-scanning mode. These factors cause a temperature gradient across the turntable, which induces thermal deformation of the mirror surface figure and ultimately degrades the imaging quality of the optical system. To address this issue, an analysis method based on thermal-structural coupling is proposed. First, the thermal balance equation of the scanning mirror turntable was established. Combined with the actual thermal boundary conditions, a finite element analysis (FEA) model was constructed. This model was utilized to optimize the design of the mirror assembly and the adhesive layer by analyzing the relationship between the surface figure and adhesive parameters under complex thermal environments and working conditions. The optimization results show that when the adhesive layer thickness is 1 mm, the mirror achieves the optimal surface figure accuracy with a root-mean-square (RMS) value of 43.54 nm. Furthermore, ground thermal chamber tests were conducted to simulate the temperature variations and operating status during takeoff. The relative error between the experimental measurements and the simulation results is less than 10%. These results verify that the proposed method is effective for evaluating the dynamic response characteristics of the scanning mirror surface in a temperature gradient field, providing theoretical support for the design of the mirror bonding layer and related components.
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