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为弥补国内航天探测中用于探测器标定的γ源单色性差、能量覆盖范围小等缺陷,设计了一种康普顿光源精密调节镜架。该镜架由压电陶瓷电机驱动,通过柔性铰链的柔性变形传递运动,对激光入射角进行精密调节,实现激光束与高能电子束精确对撞,从而获得峰值能量连续变化的γ粒子。利用伪刚体模型理论对该镜架进行建模,分别得到了该机构沿纬度方向和经度方向的刚度模型和位移模型,结合有限元仿真,对位移理论模型和镜架中应力分布规律进行了分析,其结果验证了机构参数选择的合理性。最终得到了经度、纬度方向调节范围均为1.12°、定位精度不小于6×10-4°的精密调节镜架。
In order to make up for the shortcoming of γ source monochromaticity and small energy coverage in the domestic space exploration, a Compton light source precision adjustment frame was designed. The frame is driven by a piezoceramic motor, and the flexible incident angle of the laser beam is precisely adjusted by the flexible deformation of the flexible hinge to precisely collimate the incident angle of the laser beam so as to obtain the γ particles with continuously changing peak energy. Using the pseudo-rigid body model theory to model the frame, the stiffness model and displacement model along the latitudinal and longitude directions of the mechanism were obtained respectively. Combined with the finite element simulation, the displacement theory model and the stress distribution in the frame were analyzed The results validate the rationality of institutional parameter selection. Finally, the longitude and latitude direction adjustment range of 1.12 °, positioning accuracy of not less than 6 × 10-4 ° precision adjustment frame.