遮光罩材料光学散射特性测试系统设计
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摘要
遮光罩是应用于天基光学系统中起消除杂散光作用的主要结构组成部分。遮光罩材料主要是有机玻璃(PMMA),其光学散射特性决定其消杂光的效果。而目前光学系统的杂散光分析多限于软件仿真。为此,提出一种用于遮光罩材料光学散射特性的测试系统,利用精密的位移装置,通过光电倍增管进行数据采集,得到被测目标表面的双向反射分布函数(BRDF),用以评价材料的光学散射特性。实验测试聚四氟乙烯(PTFE)漫反射板的BRDF,测试结果与国际上相同条件下测试结果一致。对比光滑表面和非光滑表面的黑色及白色有机玻璃材料的BRDF,结果可为遮光罩设计提供参考。测试系统不仅可以用于非透明目标的BRDF,也可以用于透明及半透明目标的BTDF (双向透射分布函数)。
Baffle is the main material to eliminate stray light the space-based optical system. The most common material used for baffle is Polymethyl methacrylate(PMMA),whose optical scattering characteristics determine the elimination efficiency of stray light. At present, most of the stray light analyses are relied on software simulation. For this purpose,a test system for optical scattering characteristics of the PMMA materials is presented. By using the precise adjusting mechanism,data is collected through the photomultiplier tube. And the bidirectional reflection distribution function(BRDF) of the surface of the target could be depicted,which could estimate the optical scattering characteristics of the materials. The BRDF of polytetrafluoroethylene(PTFE) diffuse is boardtested by experimentare,which is consistent with the international test results under the same conditions. The feasibility of this test device is verified by comparing the BRDF of black and white PMMA plates of smooth and non-smooth surfaces. The results can provide a reference for the design of the baffle. The test system can be used not only for BRDF of opaque targets,but also for BTDF(bidirectional transmission distribution function) of transparent and translucent targets.
Baffle is the main material to eliminate stray light the space-based optical system. The most common material used for baffle is Polymethyl methacrylate(PMMA),whose optical scattering characteristics determine the elimination efficiency of stray light. At present, most of the stray light analyses are relied on software simulation. For this purpose,a test system for optical scattering characteristics of the PMMA materials is presented. By using the precise adjusting mechanism,data is collected through the photomultiplier tube. And the bidirectional reflection distribution function(BRDF) of the surface of the target could be depicted,which could estimate the optical scattering characteristics of the materials. The BRDF of polytetrafluoroethylene(PTFE) diffuse is boardtested by experimentare,which is consistent with the international test results under the same conditions. The feasibility of this test device is verified by comparing the BRDF of black and white PMMA plates of smooth and non-smooth surfaces. The results can provide a reference for the design of the baffle. The test system can be used not only for BRDF of opaque targets,but also for BTDF(bidirectional transmission distribution function) of transparent and translucent targets.
引文
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[16]王耀东,陈桂波,张烨,等.基于Davies理论的粗糙面光散射特性研究[J].长春理工大学学报:自然科学版,2016,39(05):45-50.
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[18]李博,林冠宇,张明宇,等.紫外-真空紫外空间遥感仪器漫反射板的制备[J].光学精密工程,2009,17(03):475-481.
[2]陈赟,郑循江,刘宗明,等.星敏感器遮光罩出口杂光的辐照度测试[J].光学精密工程,2017,25(06):1464-1471.
[3]赵超,伏思华,姜广文.星敏感器遮光罩的设计与杂散光分析[J].半导体光电,2017,38(02):251-256.
[4]赵青,赵建科,徐亮,等.航天消光黑漆双向反射分布函数的测量与应用[J].光学精密工程,2016,24(11):2627-2635.
[5]周鑫弘,李小明,韩成,等.遮光罩对GEO对地激光通信系统可通率影响[J].长春理工大学学报:自然科学版,2015,38(05):39-43+52.
[6]丛海芳.基于双向反射率函数分布的海洋溢油紫外反射光谱特性研究[J].光子学报,2017,46(10):170-178.
[7]李俊麟,张黎明,陈洪耀,等.双向反射分布函数绝对测量装置研制[J].光学学报,2014,34(05):269-276.
[8]李俊麟,张黎明,司孝龙,等.基于六轴串联机械手的双向反射分布函数测量装置[J].光学精密工程,2014,22(11):2983-2989.
[9]赵敏杰,司福祺,陆亦怀,等.星载石英漫反射板双向反射分布函数实验测量研究[J].光谱学与光谱分析,2016,36(05):1565-1570.
[10] Chao Qi,ChunlingYang,WenjuanLi,etal.Stray light suppression in BRDF measurement Infared optical system[J].Chinese Optics Letters,2003,1(07):398-400.
[11]陈洪耀,张黎明,杨本永,等.漫反射参照体双向反射比因子绝对测量研究[J].大气与环境光学学报,2010,5(05):366-372.
[12]徐伟伟,张黎明,杨本永,等.基于多灰阶靶标的在轨辐射定标方法研究[J].光学学报,2012,32(02):164-168.
[13] Nicodemus F E.Reflectance nomenclature and directional reflectance and emissivity[J].Applied Optics,1970,9(06):1474-1475.
[14] Lu R,Koenderink J J,Kappers A M L.Optical properties(bidirectional reflectance distribution function of shot fabric.[J].Applied Optics,2000,39(31):5785-5795.
[15]史卫朝,郑建明,李言,等.加工表面双向反射分布函数的测量与建模[J].光学学报,2018,38(10):386-392.
[16]王耀东,陈桂波,张烨,等.基于Davies理论的粗糙面光散射特性研究[J].长春理工大学学报:自然科学版,2016,39(05):45-50.
[17] Heather J P,Clarence J Z,Thomas A G,et al.The NIST robotic optical scatter instrument(ROSI)and its application to BRDF measurements of diffuse reflectance standards for remote sensing[C].SPIE,2013,8866:886615.
[18]李博,林冠宇,张明宇,等.紫外-真空紫外空间遥感仪器漫反射板的制备[J].光学精密工程,2009,17(03):475-481.