基于光-热-结构模拟的罗兰圆型光谱仪热工况优化设计

针对目前紫外光谱仪热工况优化研究缺乏的问题,该文设计出一款探测范围为200 nm～450 nm、全波段分辨率不低于0.2 nm的罗兰圆光谱仪,并耦合光、热、结构模拟对其光室热工况开展优化研究。热仿真结果表明:在无加热、无入口风速下光谱仪底座温度、温差随时间不断增加,难以达到热平衡;优化光室入口风速,发现当入口风速为0.8 m/s时,整体温度降至36.103℃～39.859℃;基于光学器件间的热变形量的计算,光学器件截距总热变形量为0.203 mm;优化加热方式,发现顶层式加热方式最佳,整体温度降至34.241℃～36.139℃,光学器件截距总热变形量降至0.122 mm。对此进行光学仿真,结果表明,优化工况后的罗兰圆光谱仪工作热变形后可清晰分辨出两束波长相差0.2 nm的光束。

Optimization design of thermal condition of Rowland circle spectrometer based on optical,thermal and structural simulations

Aiming at the problem of lack of research on optimizing thermal condition of ultraviolet spectrometers, a Rowland circle spectrometer with a detection range of 200 nm~450 nm and a full-band resolution of no less than 0.2 nm was designed, and optimized the thermal conditions of its optical chamber by coupling optical, thermal and structural simulations. The thermal simulation results showed that the temperature and temperature difference of the spectrometer base was increased with time in the absence of heating and inlet wind speed, and it was difficult to achieve thermal balance. The inlet wind speed of optical chamber was optimized, and it was found that when that was 0.8 m/s, the overall temperature was dropped to 36.103 ℃~39.859 ℃. Based on the calculation of thermal deformation between optical devices, the intercept of total thermal deformation of several optical devices was 0.203 mm. After refining the heating method, the top-layer heating was found to be the best way, the overall temperature was dropped to 34.241 ℃~36.139 ℃, and the intercept of total thermal deformation was reduced to 0.122 mm. The optical simulation results show that the optimized Rowland circle spectrometer can still clearly distinguish the two beams with a wavelength difference of 0.2 nm after thermal deformation.