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A Novel DC-DC Converter With High Step-down/High Step-up Voltage Gain 会议论文
作者:  Miao, Shan;  Wang, Faqiang;  Ma, Xikui
收藏  |  浏览/下载：4/0  |  提交时间：2019/11/26
INVESTIGATION OF A SUPER-LIFT LUO-CONVERTER USED IN SOLAR PANEL SYSTEM 会议论文
作者:  Shan, Zeng-li;  Liu, Shuo;  Luo, Fang-lin
收藏  |  浏览/下载：3/0  |  提交时间：2019/12/05
808nm high-power semiconductor laser therapeutic apparatus based on LPC2138 (EI CONFERENCE) 会议论文
2011 IEEE International conference on Intelligent Computation and Bio-Medical Instrumentation, ICBMI 2011, December 14, 2011 - December 17, 2011, Wuhan, Hubei, China
Wang B.
收藏  |  浏览/下载：24/0  |  提交时间：2013/03/25
Modeling arrays of rectilinear solenoids for current sensing 会议论文
作者:  Dongwei, Li;  Di Rienzo, Luca
收藏  |  浏览/下载：2/0  |  提交时间：2019/12/10
Method of auto multi-exposure for high dynamic range imaging (EI CONFERENCE) 会议论文
2010 International Conference on Computer, Mechatronics, Control and Electronic Engineering, CMCE 2010, August 24, 2010 - August 26, 2010, Changchun, China
Piao Y.; Xu W.
收藏  |  浏览/下载：13/0  |  提交时间：2013/03/25
This paper proposes a method for calculating the multi-exposure times fast and accurately when the scene has a high dynamic range  minimizing the pictures needed to take and improving the dynamic range of the CCD system. The proposed method first measures the camera's response function referring [10]. After that the median value of the output picture is adjusted to be in the middle range of the system output by changing the exposure time. It can be inferred from the histogram of the current picture whether it's a high dynamic range scene by calculating the number of pixels under exposed and over exposed. Once again the under and over exposed pixels are adjusted to be in the middle according to the camera's response function. Finally different exposed pictures (2 or 3) are fused together by Gaussian function and the dynamic range is compressed by y correction. Experimental results on UNIQ-UM400 analog camera and a digital acquisition system show that the algorithm works well and solve the problem of low dynamic range of CCD camera. 2010 IEEE.  
High speed weld control system of dual-bypass MIG based on LabVIEW 会议论文
Guangzhou, China, December 7, 2010 - December 9, 2010
作者:  Xue, Cheng;  Shi, Yu;  Fan, Ding;  Zhong, Hao;  Shi, Mingxiao
收藏  |  浏览/下载：0/0  |  提交时间：2020/11/15
Micro-motion exposure method based on PZT piezoelectric ceramics (EI CONFERENCE) 会议论文
International Symposium on Photoelectronic Detection and Imaging 2009: Material and Device Technology for Sensors, June 17, 2009 - June 19, 2009, Beijing, China
Sun W.-J.; Zhang M.-H.; Meng Z.
收藏  |  浏览/下载：92/0  |  提交时间：2013/03/25
There mainly is laser digital photofinishing technique and digital photofinishing technique based on LCD consisting of TFT and LCOS in the digital photofinishing field at the present time. The former have a good many merit such as wide color gamut  high processing rate  large output size and high brightness  but his cost is very high  his maintain technique being comparatively complex  that result in difficult use for people. The utilization ratio of the latter is low because of lower resolution and lower aperture ratio for LCD  but the digital photofinishing based on LCD have lower cost and higher utilization ration  being suitable for people's current standard of living. Considering above mentioned problem  a micro-motion exposure method based on PZT piezoelectric ceramics used in digital image photofinishing is presented. The two-dimension micro-motion exposure system consisting of PZT piezoelectric ceramics  LCD panel  polarizing film and spring strip is designed. By means of PZT piezoelectric ceramics the LCD panel is removed about the one half of the pixel size of the LCD panel for four times from the original place  at the same time imaging system is exposed four times at the printing paper. The software is used to control the time synchronization  the exposure time and motion range of the LCD panel. The system has advantages such as shorter response time than 0.1seconds  lesser motion error than 0.01 microns  high stability and repeatability. Experimental results show that the proposed micro-motion exposure method improve the picture brightness and enlarge output size  at the meantime reducing the cost of the system. 2009 SPIE.  
Storage and compression design of high speed CCD (EI CONFERENCE) 会议论文
4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, November 19, 2008 - November 21, 2008, Chengdu, China
Cai X.; Zhai L. P.
收藏  |  浏览/下载：47/0  |  提交时间：2013/03/25
In current field of CCD measurement  large area and high resolution CCD is used to obtain big measurement image  so that  speed and capacity of CCD requires high performance of later storage and process system. The paper discusses how to use SCSI hard disk to construct storage system and use DSPs and FPGA to realize image compression. As for storage subsystem  Because CCD is divided into multiplex output  SCSI array is used in RAID0 way. The storage system is composed of high speed buffer  DMA controller  control MCU  SCSI protocol controller and SCSI hard disk. As for compression subsystem  according to requirement of communication and monitor system  the output is fixed resolution image and analog PAL signal. The compression means is JPEG2000 standard  in which  9/7 wavelets in lifting format is used. 2 DSPs and FPGA are used to compose parallel compression system. The system is composed of FPGA pre-processing module  DSP compression module  video decoder module  data buffer module and communication module. Firstly  discrete wavelet transform and quantization is realized in FPGA. Secondly  entropy coding and stream adaption is realized in DSPs. Last  analog PAL signal is output by Video decoder. Data buffer is realized in synchronous dual-port RAM and state of subsystem is transfer to controller. Through subjective and objective evaluation  the storage and compression system satisfies the requirement of system. 2009 SPIE.  
Temperature characteristics of high power vertical cavity surface emitting lasers (EI CONFERENCE) 会议论文
Semiconductor Lasers and Applications III, November 12, 2007 - November 13, 2007, Beijing, China
Yan C.; He C.; Lu G.; Qin L.
收藏  |  浏览/下载：17/0  |  提交时间：2013/03/25
By using oxidation confinement technology high power vertical-cavity surface-emitting lasers are fabricated in experiment. The electrical and optical performance characteristics such as threshold current  efficiency  emission wavelength  and output power are measured under continuous wave (CW) condition at room temperature. The maximum output power is up to watt regime at wavelength of about 980nm. The temperature characteristics of the device are investigated experimentally in detail. The variation in lasing threshold current with temperature is studied. The characteristic temperature T0 of the device is derived  and the value is about 211K. Such a high characteristic temperature T0 of threshold current can lead to good temperature sensitivity of the device. At the same time  the lasing spectrum characteristics with temperature are also measured. The wavelength shift with temperature is just about 0.06nm/K. From the measured results  it is shown that the device can still operate at high temperature condition.  
A novel bottom-emitting vcsel's one-dimension array (EI CONFERENCE) 会议论文
Optoelectronic Materials and Devices III, October 27, 2008 - October 30, 2008, Hangzhou, China
Cui J.; Ning Y.; Li T.; Zhang Y.; Liu G.; Zhang X.; Wang Z.; Shi J.; Kong P.; Qin L.; Liu Y.; Wang L.
收藏  |  浏览/下载：17/0  |  提交时间：2013/03/25
A novel 980nm bottom-emitting VCSELs array with high power density and good beam property of Gaussian far-field distribution is reported. This array is composed of 5 symmetrically-arranged elements of 200m  150m and 100m-diameter  with the center spacings of 300m and 250m respectively. The maximum power is 880mW at a current of 4A  corresponding to lKW/cm2 average optical power density. The differential resistance is 0.09 with a threshold of 0.56A. The novel array is compared with a 300m-aperture-size single device and a 44 2-D array with 50m element aperture size and 250m centre spacing. The three devices have the same lasing area. The conclusion is that the novel array is better in the property of output power  threshold current  lasing spectra  far-field distribution etc. 2008 SPIE.  

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