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非制冷IRFPA像元结构与时空随机噪声的优化理论(英文)

发布时间:2021-03-01 20:47
  非制冷红外焦平面探测器(Uncooled IRFPA)像元结构从单层结构向双层结构的发展降低了探测器噪声,提升了性能。介绍了像元的MEMS结构及主要物理参数,指出双层结构与单层结构的主要差异在于像元有效面积和桥臂热导的不同。三维噪声模型是对IRFPA噪声进行分析的有效手段,其中时空随机噪声是非制冷IRFPA最主要的噪声成份。分析了非制冷IRFPA时空随机噪声的产生机理,建立了时空随机噪声模型,得到时空随机噪声与像元有效面积和桥臂热导的关系。将某款单层像元结构探测器改进为双层像元结构并进行噪声测试,实测数据证明了非制冷IRFPA时空随机噪声模型的有效性。 

【文章来源】:红外与毫米波学报. 2020,39(02)北大核心

【文章页数】:7 页

【部分图文】:

非制冷IRFPA像元结构与时空随机噪声的优化理论(英文)


图1微测辐射热计像元典型结构示意图[2]??

双层结构,单层结构,像元,毫米波


144??红外与毫米波学报??39卷??ble-layer?pixel?structure?has?become?the?development??trend?in?uncooled?IRFPA?pixel?structure?research.??⑷?(b)??Fig.?2?Pixel?MEMS?architecture?(a)?single?layer,?(b)?double??layers??图2像元MEMS结构(a)单层结构,(b)双层结构??The?difference?between?the?double-layer?structure??and?single-layer?structure?is?mainly?expressed?on?the??membrane?and?leg.?The?effect?of?the?membrane?is?to?ab???sorb?infrared?radiation?and?convert?heat?into?the?change?in??value?of?the?pixel?resistance.?The?area?of?the?membrane??with?infrared?absorption?ability?is?called?the?effective?area??of?the?pixel.?The?larger?the?effective?area,?the?stronger??the?absorption?ability?for?infrared?radiation.?For?a?single???layer?structure,?the?total?area?

密度图,噪声功率,半导体,密度


ontribu???tion?of?temperature?fluctuation?noise?and?background?fluc???tuation?noise?to?crTVH?is?very?small,?so?the?two?secondary??noise?sources?are?not?discussed?in?the?following?section.??Fig.?3?Noise?power?density?of?a?semiconductor?resistor??图3?1?kQ半导体电阻的噪声功率密度??2?Spatio-temporal?random?noise?model??of?uncooled?IRFPA??2.1?NETD?of?spatio-temporal?random?noise??The?noise?of?the?IRFPA?directly?affects?the?perfor???mance?of?the?imaging?system.?The?noise?equivalent?tem???perature?difference?(NETD)?is?a?parameter?to?evaluate??the?performance?of?the?IRFPA,?which?combines?the?noise??level?and?the?signal?response?ability.?Because?of?its?clear??definition?and?ease?of?testing,?it?has?been?widely?used.??The?NETD?formula?for?

【参考文献】:
期刊论文
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