中国科学院机构知识库网格系统: 检索

A gain control and stabilization technique for Silicon Photomultipliers in low-light-level applications around room temperature 期刊论文 OAI收割
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2012, 卷号: 695, 页码: 222-225
作者: Li ZW(李正伟); Xu YP(徐玉鹏); Liu CZ(刘聪展); Li, ZW; Xu, YP

收藏 | 浏览/下载：44/0 | 提交时间：2016/04/08

SiPM MPPC Gain control Dark current

The technique of camera scan control based on current loop control (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Electronics and Optoelectronics, ICEOE 2011, July 29, 2011 - July 31, 2011, Dalian, China
作者: Liu Z.

收藏 | 浏览/下载：21/0 | 提交时间：2013/03/25

As the crucial structure of aerial camera sca reflector is always requested with high performance of control precision stable running and rapid responding. The paper introduces a kind of method about current loop control system which is based on position and velocity dual-closed loop control system. This method improves effectively the performance of velocity closed loop control system and amplifies the gain of low frequency. The results show applying these control methods the influence of the torque ripple has decrease 50% and the compensation rate precsion has promoted double. 2011 IEEE.

Temperature-dependent modulation characteristics for 1.3 mu m InAs/GaAs quantum dot lasers 期刊论文 OAI收割
journal of applied physics, 2010, 卷号: 107, 期号: 1, 页码: art. no. 013102
Xu PF (Xu Peng-Fei); Yang T (Yang Tao); Ji HM (Ji Hai-Ming); Cao YL (Cao Yu-Lian); Gu; YX (Gu Yong-Xian); Liu Y (Liu Yu); Ma WQ (Ma Wen-Quan); Wang ZG (Wang Zhan-Guo)

收藏 | 浏览/下载：215/54 | 提交时间：2010/04/13

energy states optical modulation quantum dot lasers THRESHOLD CURRENT WELL GAIN

Vertical structure permeable-base hybrid transistors based on multilayered metal base for stable electrical characteristics 期刊论文 OAI收割
organic electronics, 2009, 卷号: 10, 期号: 2, 页码: 357-362
Serbena JPM; Huang JY; Ma D; Wang ZY; Huemmelgen IA

收藏 | 浏览/下载：15/0 | 提交时间：2010/05/27

LOW OPERATIONAL VOLTAGE ORGANIC TRANSISTORS HIGH-PERFORMANCE CURRENT GAIN TRIODES EMITTER LAYER

Vertical structure p-type permeable metal-base organic transistors based on N,N '-diphentyl-N,N '-bis(1-naphthylphenyl)-1,1 '-biphenyl-4,4 '-diamine 期刊论文 OAI收割
applied physics letters, 2008, 卷号: 92, 期号: 23, 页码: 文献编号：232111
Huang JY; Yi MD; Ma DG; Hummelgen IA

收藏 | 浏览/下载：251/84 | 提交时间：2010/04/14

THIN-FILM-TRANSISTOR CURRENT GAIN ARCHITECTURE EMITTER

Study of emi 8 '' pmts for reactor neutrino experiment 期刊论文 iSwitch采集
High energy physics and nuclear physics-chinese edition, 2007, 卷号: 31, 期号: 5, 页码: 481-486
作者: Zhong Wei-Li; Liu Jin-Chang; Yang Chang-Gen; Guan Meng-Yun; Li Zu-Hao

收藏 | 浏览/下载：21/0 | 提交时间：2019/04/23

Reactor neutrino experiment Pmt Quantum efficiency Linearity Gain and dark current Afterpulse ratio Incident angle effect

High power vertical cavity surface-emitting laser with high reliability (EI CONFERENCE) 会议论文 OAI收割
Optoelectronic Materials and Devices II, November 2, 2007 - November 5, 2007, Wuhan, China
Changling Y.; Guoguang L.; Chunfeng H.; Li Q.

收藏 | 浏览/下载：18/0 | 提交时间：2013/03/25

High-power vertical-cavity surface-emitting lasers with InGaAs/GaAs quantum well active gain region are investigated. By using AlAs oxidation technology the devices have been fabricated in experiment and the characteristics of the device are carried out at room temperature. The 300m-diameter VCSELs have the maximum room temperature continuous wave (CW) optical output power of about 1.1W and the threshold current of the device is about 0.46A. The life test of the device is carried out in constant current mode. The life test of 300-m diameter lasers shows that the average lifetime is about 1800h at 80C. The device degradation mechanism is also discussed in detail.

High power VCSEL device with periodic gain active region (EI CONFERENCE) 会议论文 OAI收割
Optoelectronic Materials and Devices II, November 2, 2007 - November 5, 2007, Wuhan, China
作者: Zhang Y.; Liu Y.; Liu Y.; Liu Y.; Qin L.

收藏 | 浏览/下载：31/0 | 提交时间：2013/03/25

High power vertical cavity surface emitting lasers with large aperture have been fabricated through improving passivation lateral oxidation and heat dissipation techniques. Different from conventional three quantum well structure a periodic gain active region with nine quantum wells was incorporated into the VCSEL structure with which high efficiency and high power operation were expected. The nine quantum wells were divided into three groups with each of them located at the antinodes of the cavity to enhance the coupling between the optical field and the gain region. Large aperture and bottom-emitting configuration was used to improve the beam quality and the heat dissipation. A maximum output power of 1.4W was demonstrated at CW operation for a 400m-diameter device. The lasing wavelength shifted to 995.5nm with a FWHM of 2nm at a current of 4.8A due to the internal heating and the absence of active water cooling. A ring-shape farfield pattern was induced by the non-homogeneous lateral current distribution in large diameter device. The light intensity at the center of the ring increased with increasing current. A symmetric round light spot at the center and single transverse mode operation with a divergence angle of 16 were observed with current beyond 4.8A.

Study of EMI 8 '' PMTs for reactor neutrino experiment 期刊论文 OAI收割
HIGH ENERGY PHYSICS AND NUCLEAR PHYSICS-CHINESE EDITION, 2007, 卷号: 31, 期号: 5, 页码: 481-486
作者: Zhong WL(钟玮丽); Liu JC(刘金昌); Yang ZG(杨长根); Guan MY(关梦云); Li ZH(李祖豪)

收藏 | 浏览/下载：22/0 | 提交时间：2016/06/28

reactor neutrino experiment PMT quantum efficiency linearity gain and dark current afterpulse ratio incident angle effect

High-accuracy real-time automatic thresholding for centroid tracker (EI CONFERENCE) 会议论文 OAI收割
ICO20: Optical Information Processing, August 21, 2005 - August 26, 2005, Changchun, China
作者: Wang Y.; Wang Y.; Wang Y.; Wang Y.; Zhang Y.

收藏 | 浏览/下载：37/0 | 提交时间：2013/03/25

Many of the video image trackers today use the centroid as the tracking point. In engineering we can get several key pairs of peaks which can include the target and the background around it and use the method of Otsu to get intensity thresholds from them. According to the thresholds it give a great help for us to get a glancing size a target's centroid is computed from a binary image to reduce the processing time. Hence thresholding of gray level image to binary image is a decisive step in centroid tracking. How to choose the feat thresholds in clutter is still an intractability problem unsolved today. This paper introduces a high-accuracy real-time automatic thresholding method for centroid tracker. It works well for variety types of target tracking in clutter. The core of this method is to get the entire information contained in the histogram we can gain the binary image and get the centroid from it. To track the target so that we can compare the size of the object in the current frame with the former. If the change is little such as the number of the peaks the paper also suggests subjoining an eyeshot-window we consider the object has been tracked well. Otherwise their height just like our eyes focus on a target if the change is bigger than usual position and other properties in the histogram. Combine with this histogram analysis we will not miss it unless it is out of our eyeshot we should analyze the inflection in the histogram to find out what happened to the object. In general the impression will help us to extract the target in clutter and track it and we will wait its emergence since it has been covered. To obtain the impression what we have to do is turning the analysis into codes for the tracker to determine a feat threshold. The paper will show the steps in detail. The paper also discusses the hardware architecture which can meet the speed requirement. the paper offers a idea comes from the method of Snakes