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Propagating disturbances along a coronal loop from simultaneous EUV imaging and spectroscopic observations
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作者 Ajanta Datta S.Krishna Prasad Dipankar Banerjee 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2015年第7期1027-1035,共9页
Propagating disturbances(PDs) were studied along an active region loop using simultaneous imaging and spectroscopy. An image sequence recorded in the Fe Ⅸ/Fe X 171 channel, from TRACE and spectral data in the Si ... Propagating disturbances(PDs) were studied along an active region loop using simultaneous imaging and spectroscopy. An image sequence recorded in the Fe Ⅸ/Fe X 171 channel, from TRACE and spectral data in the Si Ⅻ 520.6 line obtained from CDS/SOHO, are analyzed. A space-time map constructed from the TRACE image sequence shows the presence of PDs close to the loop foot point propagating with an apparent speed of 39 km s-1. The periodicity was found to be 5.4 min.The corresponding spectroscopic data from CDS, at a location away from the foot point, show oscillations in all three line parameters roughly at the same period. At locations farther from the foot point, the line width oscillation seems to disappear while the Doppler velocity oscillation becomes prominent. We attribute this to the signature of propagating slow waves that get affected by flows/other events close to the foot point. Spectral line profiles do not show much asymmetry, however, it is difficult to infer anything due to the broadened Gaussian shape of the CDS line profiles. 展开更多
关键词 Sun: corona -- oscillations -- uv radiation -- imaging spectroscopy
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用于紫外线成像和无线报警的水凝胶基可伸缩、高稳定性和高性能的光电传感器
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作者 洪杰钊 姚帝杰 +9 位作者 王浩 丁琼玲 罗艺冰 于家豪 张鹤 曾令兴 杨柏儒 王冰 陶凯 吴进 《Science China Materials》 SCIE EI CAS CSCD 2024年第6期1926-1937,共12页
柔性可穿戴的紫外线探测器在个体紫外线暴露监测、智能仿生眼和军事领域受到广泛关注.然而,传统不可拉伸的材料和器件结构设计限制了设备在可动态变形的人体皮肤和非平面表面上的精确监测应用和稳定附着.在本研究中,我们提出了基于氧化... 柔性可穿戴的紫外线探测器在个体紫外线暴露监测、智能仿生眼和军事领域受到广泛关注.然而,传统不可拉伸的材料和器件结构设计限制了设备在可动态变形的人体皮肤和非平面表面上的精确监测应用和稳定附着.在本研究中,我们提出了基于氧化铜/碳-水凝胶-氧化锌/碳的新型应变隔离异质结构的本征可拉伸(拉伸应变或弯曲高达150%)紫外线探测器,该探测器具有高灵敏度(开/关比为2100%)、高稳定性(大于4000次循环),以及快速响应和恢复时间(分别为1.5和4 s).值得注意的是,该探测器通过水凝胶桥在氧化铜/碳和氧化锌/碳电极之间引入的p-n结能带结构,以及离子导电水凝胶中I^(-)/I_(3)^(-)的电化学反应机制,显著提高了其载流子效率和紫外线响应强度.本文通过集成传感器与所设计的电路板,进一步开发了一种无线紫外线报警系统,用于紫外线强度超标警报.此外,本文还设计了一种光电传感器阵列,并将其用作视网膜假体,以实现对环境紫外线强度的实时监测和成像.本文基于水凝胶基异质结构为开发可穿戴、可拉伸的光电紫外线传感器单元和成像阵列提供了一种新的可行方法. 展开更多
关键词 flexible hydrogel sensors stretchable uv sensors uv imaging array optoelectronic sensors wireless alarm
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A novel monolithic ultraviolet image sensor based on a standard CMOS process 被引量:1
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作者 李贵柯 冯鹏 吴南健 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2011年第10期133-138,共6页
We present a monolithic ultraviolet(UV) image sensor based on a standard CMOS process.A compact UV sensitive device structure is designed as a pixel for the image sensor.This UV image sensor consists of a CMOS pixel... We present a monolithic ultraviolet(UV) image sensor based on a standard CMOS process.A compact UV sensitive device structure is designed as a pixel for the image sensor.This UV image sensor consists of a CMOS pixel array,high-voltage switches,a readout circuit and a digital control circuit.A 16×16 image sensor prototype chip is implemented in a 0.18μm standard CMOS logic process.The pixel and image sensor were measured. Experimental results demonstrate that the image sensor has a high sensitivity of 0.072 V/(mJ/cm^2) and can capture a UV image.It is suitable for large-scale monolithic bio-medical and space applications. 展开更多
关键词 uv image sensor standard CMOS process floating gate
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