简介:TN2532003021143光纤电压传感器最新进展=Recentadvancesinfiber-opticvoltagesensors[刊,中]/唐丽杰(北方交通大学光波技术研究所.北京(100044)),吴重庆…//半导体光电.—2002,23(4).—228-232综述了光纤电压传感器近年来国内外的最新研究进展,包括可用于SF6绝缘高压开关的光纤电压传感器、频率调制型的光纤电压传感器以及光控灵敏度的光纤电压传感器。介绍了国内在光纤电压传感器方面的研究进展,包括以DSP为信号处理芯片的BGO晶体的光纤电压传感器,以及应用光纤传感器机理来测试脉冲电压和电场的方法,并对光纤电压互感器暂态信号处理的原理进行了研究,试验证明可以满足继电保护的要求。图10参
简介:LowcostsiliconcarbonnanometerpowderwassynthesizedbycarbothermalreductionmethodwithnanometerSiO2andcarbonasrawmaterial.Itssynthesisthermodynamicswerediscussed.TheinfluenceofLaonTG-DSCcurvewasalsoanalyzed.ItindicatedthatthesynthesisprocessofSiCpowderhadtwosteps.InthefirststeptwomedialproductionsofSiOgandCOgformed,andinthesecondstep,β-SiCwasfinallysynthesized.After0.3%Laadded,atthefirststep,theinitiatoryformingtemperatureofproducingSiO(g)andCO(g)declinedfrom1351.4to1250.9℃,andthethermalactivationenergydecreasedfrom223.6to34.7J·g-1;atthesecondsteptheinitiatoryformingtemperatureofsynthesizingβ-SiCpowderdeclinedfrom1526.5to1357.8℃,andthethermalactivationenergydecreasedfrom693.7to295.7J·g-1.WithoutLaadded,thebestsynthesistechnologyforβ-SiCpowderwas1550℃for120min,averagepowderdiameterwasbiggerabout150nm.WithLaadded,thebestsynthesistechnologywas1500℃for120min,averagepowderdiameterwasabout100nm.