波前编码红外成像系统的温度梯度适应能力探究  

Adaptability of the Temperature Gradients of an Infrared Imaging Wavefront Coding System

作　　者：盛婧 蔡怀宇[1] 汪毅[1] 陈晓冬[1] Sheng Jing;Cai Huaiyu;Wang Yi;Chen Xiaodong(School of Precision Instruments and Opto-Electronics Engineering,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学精密仪器与光电子工程学院,天津300072

出　　处：《天津大学学报（自然科学与工程技术版）》2024年第5期521-529,共9页Journal of Tianjin University：Science and Technology

基　　金：国家自然科学基金重大科研仪器研制项目(82027801).

摘　　要：利用波前编码技术为红外光学系统进行无热化设计可提高其在不同均匀工作温度下的适应能力,但针对温度突变、成像系统内温度分布不均情况,波前编码技术是否能正常进行成像及其适用的温度范围还有待进一步研究.为简化分析流程,采用温度梯度模型来仿真非稳态下的温度变化.利用温度梯度模型来定性分析光学系统在轴向、径向温度梯度为系统引入的附加像差.计算两个方向下的光程差变化来比较两种温度梯度环境下系统的成像性能差异.在此基础上,为非稳态温度环境下红外光学系统的设计建立了结合光/机/热分析的无热化设计流程,通过ZEMAX设计了一套最大轴向尺寸为85 mm、最大径向尺寸为25 mm的红外光学系统,通过SolidWorks加载轴向和径向的热形变,探究所设计的系统能够适用的温度梯度范围.结果表明,结合光/机/热分析的无热化设计流程可以有效表明系统在非稳态温度下的成像情况.对上述采用三次相位板进行无热化设计的红外光学系统,在非稳态温度下可以适应±10℃的轴向温差范围,但是仅可以适应±1℃的径向温差范围.因此在进行红外波前编码光学系统的无热化设计时,需要对径向方向进行重点优化.The use of wavefront coding technology for the nonthermal design of infrared optical systems can improve their adaptability to different uniform operating temperatures.However,whether the wavefront coding technology can properly work or not when the temperature abruptly changes and the temperature distribution in the system is nonuniform must be elucidated.To simplify the analysis,a temperature gradient model was used to simulate nonuniform temperature variations.The temperature gradient model was used to qualitatively analyze the additional aberrations introduced into the optical system by the axial and radial temperature gradients.The difference in imaging performance between the two temperature gradient environments was compared by evaluating the change in the optical range difference in both directions.Accordingly,a nonthermal design process combining optical/mechanical/thermal analysis was established for the design of infrared optical systems in nonuniform temperature environments.A cubic phase mask infrared optical system with maximum axial and radial dimension of 85 mm and 25 mm,respectively,was designed using ZEMAX,and the thermal profile changes in the axial and radial directions were loaded by SolidWorks to examine the temperature gradient range in which the designed system can be applied.Results show that a combined optical/mechanical/thermal analysis of the nonthermal design flow can effectively indicate the imaging capacity of the system at nonuniform temperature conditions.The designed infrared optical system can accommodate a change of±10℃in axial temperature differences but only a change of±1℃in radial temperature differences.Therefore,the radial direction must be more optimized while designing nonthermal optical systems for infrared wavefront coding.

关 键 词：波前编码技术 红外光学成像系统 温度梯度 三次相位板 

分 类 号：TN216[电子电信—物理电子学]