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高时间分辨力瞬态热反射显微热成像装置
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作者 刘岩 翟玉卫 +3 位作者 荆晓冬 丁立强 任宇龙 吴爱华 《宇航计测技术》 CSCD 2022年第5期73-78,共6页
瞬态热反射显微热成像能够测量电子器件表面温度分布,兼具高时间分辨力和高空间分辨力,在GaN HEMT等大功率器件热测试中应用日益广泛。研发了瞬态热反射显微热成像装置,利用窄脉冲照明,捕捉特定短时间内被测器件表面的图像,实现瞬态热... 瞬态热反射显微热成像能够测量电子器件表面温度分布,兼具高时间分辨力和高空间分辨力,在GaN HEMT等大功率器件热测试中应用日益广泛。研发了瞬态热反射显微热成像装置,利用窄脉冲照明,捕捉特定短时间内被测器件表面的图像,实现瞬态热反射热成像,时间分辨力达到1μs。以微带电阻作为被测器件开展了瞬态测温实验,激励脉宽10μs,测试得到了不同时刻微带电阻上温度分布,可以观察到升温和降温过程的细节,温度上升和下降时间在(2~3)μs,有效验证了装置的时间分辨力性能。 展开更多
关键词 热反射显微热成像 温度分布 瞬态 高时间分辨力
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Influence of solar wind dynamic pressure on geomagnetic Dst index during various magnetic storms 被引量:10
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作者 ZHAO Hong ZONG QiuGang +1 位作者 WEI Yong WANG YongFu 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第6期1445-1454,共10页
The Dst index,designed as a proxy of ring current intensity,is known to be also affected by other magnetospheric current systems,e.g.magnetopause current.The pressure-corrected Dst index is obtained by removing the ef... The Dst index,designed as a proxy of ring current intensity,is known to be also affected by other magnetospheric current systems,e.g.magnetopause current.The pressure-corrected Dst index is obtained by removing the effects of the solar wind dynamic pressure and the quiet time ring current.However,all previous studies treated the correction coefficient as an averaged parameter for storms of different intensity.In this paper,based on the Burton's equations and employing two independent methods,we will show a positive correlation between pressure-correction coefficient b and the intensity of the storms.We divided our storm database(872 storms in total) into three categories according to the intensity of storms.In order to improve the accuracy of calculating,we also used the higher-resolution SYM-H index data instead of Dst index to compute the corrected Dst index during different storms.Furthermore,we are able to provide corrected magnetic storm index with high-time resolution(-1 min). 展开更多
关键词 corrected Dst index pressure correction geomagnetic storms with different intensity
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