文章编号：1002-2082(2023)01-0195-07热压载荷作用下气体检测光学窗口对激光传输影响李栋1，李品烨1，王迪1,2，吕妍1,2，郭曦1（1.东北石油大学土木建筑工程学院，黑龙江大庆163318；2.东北石油大学物理与电子工程学院，黑龙江大庆163318）摘要：采用有限元方法研究了不同热压载荷作用下多组分气体原位激光检测系统的光学窗口变形分布情况，并根据热光效应计算得到光学窗口折射率分布。采用光线追迹法对比分析了氮气吹扫前后光学窗口折射率变化及变形对到达接收面的通光量和辐照度分布影响规律。此外，基于高温光学窗口激光透射测试平台开展了高温光学窗口对检测信号影响研究。结果表明：高温高压环境会使光学窗口折射率变化幅度增大及变形加剧，导致激光光路偏折引起透射光强损耗和探测信号条纹干涉；氮气吹扫可以有效改善激光传输条件，增加到达接收面的通光量，优化辐照分布，提高激光传输质量。关键词：热压载荷；光窗变形；折射率；激光传输中图分类号：TN249文献标志码：ADOI：10.5768/JAO202344.0107001InfluenceofopticalwindowforgasdetectiononlasertransmissionunderthermalpressingloadsLIDong1，LIPinye1，WANGDi1,2，LYUYan1,2，GUOXi1（1.SchoolofCivilEngineeringandArchitecture,NortheastPetroleumUniversity,Daqing163318,China；2.SchoolofPhysicsandElectronicEngineering,NortheastPetroleumUniversity,Daqing163318,China）Abstract：Thefiniteelementmethodwasusedtostudythedeformationdistributionoftheopticalwindowofthemulti-componentgasin-situlaserdetectionsystemunderdifferentthermalpressingloads,andtherefractiveindexdistributionoftheopticalwindowwascalculatedaccordingtothethermo-opticeffect.Theinfluencelawsoftherefractiveindexchangeanddeformationoftheopticalwindowbeforeandafternitrogenpurgingontheluminousfluxandirradiancedistributionreachingthereceivingsurfacewerecomparedandanalyzedbyraytracingmethod.Inaddition,basedonthelasertransmissiontestplatformofhigh-temperatureopticalwindow,theinfluenceofhigh-temperatureopticalwindowonthedetectionsignalwasstudied.Theresultsshowthatthehigh-temperatureandhigh-pressureenvironmentwillincreasetherefractiveindexchangeamplitudeanddeformationoftheopticalwindow,whichresultinginthelaseropticalpathdeflectioninducedt...
