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THE THERMAL ANALYSIS OF LAPAN'S IR MICRO BOLOMETER OPTICAL DESIGN

机译：LAPAN红外微型集光镜光学设计的热分析

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Generally, there are several steps in designing and evaluating of a space optical system. One of them that have to consider carefully and needs pay attention a bit deeper is thermal analysis of optical design. Temperature changing in orbit can make lens to be either defocused or saturated. For that reason, the unity of thermal { optical system, without forgetting the structure modeling, is important thing in design process. After two years analysis and de ne Lapan's IR Micro bolometer requirements, the design of its optical has been starting since the beginning of this year. As a beginner in designing optical system, we have realized that thermal system would provide the big challenge in design process. Some requirements either came up from IR Micro bolometer itself or Lapan's micro satellite, i.e., uncooled system, light, lightweight, and low cost, have also made Lapan's micro bolometer optical design become more complicated as well. This paper describes the thermal analysis of Lapan's IR Micro bolometer optical design. Software either Thermal Desktop / Sinda Fluint or Finite Elements was used to analyze several conditions, such as orbital heating rate, heat uxes, heat loads, and etc. Speci cally for orbital heating rate, Monte Carlo approach was applied throughout the review process. From the graphs resulted, e.g., total absorbed ux of transient analysis, MLI (Multi Layer Insulation) is chosen to cover the IR Micro bolometer Aluminum box. Meanwhile, in order to address the defocused issue, an athermal optics will be applied for the IR Micro bolometer lens material since it is line with the design requirements which tend to the thermal passive system. In this case, we have two options. First, lens materials and difΓractive lens will be integrated in one optic system. Meanwhile the other one, the passive heaters probably will be placed on behind the IR Micro bolometer mirror in order to keep and maintain room temperature.
机译：通常，在设计和评估空间光学系统时需要执行几个步骤。光学设计的热分析是其中必须仔细考虑并且需要更深层次关注的问题之一。轨道上的温度变化会使镜头散焦或饱和。因此，在设计过程中，不遗漏结构建模的热光学系统的统一是很重要的。经过两年的分析和对de la Lapan红外测辐射热仪的要求，从今年年初开始就开始设计其光学器件。作为设计光学系统的初学者，我们已经意识到热系统将在设计过程中带来巨大挑战。某些要求要么来自IR Micro辐射热测量计本身，要么来自Lapan的微型卫星，即非冷却系统，轻巧，轻巧和低成本，这也使Lapan的微型辐射热测量计的光学设计也变得更加复杂。本文介绍了Lapan的IR Micro热辐射计光学设计的热分析。使用Thermal Desktop / Sinda Fluint或Finite Elements软件来分析多种条件，例如轨道加热速率，热通量，热负荷等。对于轨道加热速率，在整个审查过程中均采用了蒙特卡洛方法。从结果图（例如瞬态分析的总吸收量ux）中，选择MLI（多层绝缘）覆盖IR Micro辐射热计铝盒。同时，为了解决散焦问题，由于红外微测辐射热透镜材料符合倾向于热被动系统的设计要求，因此将其用于红外微辐射热计透镜材料。在这种情况下，我们有两个选择。首先，透镜材料和衍射透镜将集成在一个光学系统中。同时，另一个可能是将被动加热器放在IR Micro辐射热计反射镜的后面，以保持和维持室温。

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