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	Research on selection of high intensity laser beam expanding system 会议论文 OAI收割 Kunming, China, 2021-12-07 作者: Gao, Na; Zhang, XiangHui; Liu, Jie; Shen, ZeYi; Xin, Wei \| 收藏 \| 浏览/下载：50/0 \| 提交时间：2022/04/27 beam expander reflecting system refraction system off-axis,coaxial
	采用涡轮膨胀机的有机朗肯循环系统优化期刊论文 OAI收割新能源进展, 2017, 卷号: 5, 期号: 1, 页码: 23-31 作者: 刘茜; 刘莉娜; 王令宝; 卜宪标; 李华山 \| 收藏 \| 浏览/下载：20/0 \| 提交时间：2018/12/21 R245fa 低温余热有机朗肯循环涡轮膨胀机参数优化敏感性分析 R245fa low-temperature waste heat organic Rankine cycle turbo-expander parameter optimization sensitivity analysis
	Study of a single-valve reciprocating expander 期刊论文 OAI收割 JOURNAL OF THE ENERGY INSTITUTE, 2016, 卷号: 89, 期号: 3, 页码: 400-413 作者: Zhang, Xinjing; Xu, Yujie; Xu, Jian; Xue, Haobai; Chen, Haisheng 收藏 \| 浏览/下载：39/0 \| 提交时间：2016/10/14 CAES Expander Simulation Flow losses Vortex
	Experimental investigation on the CO2 transcritical power cycle 期刊论文 OAI收割 ENERGY, 2016, 卷号: 95, 页码: 247-254 作者: Pan LS(潘利生); Li B(李博); Wei XL(魏小林); Li T(李腾); Pan, LS 收藏 \| 浏览/下载：38/0 \| 提交时间：2016/03/21 CO2 transcritical power cycle Rolling piston expander System performance Experimental study
	Performance analysis and working fluid selection for geothermal energy-powered organic Rankine-vapor compression air conditioning 期刊论文 OAI收割 Geothermal Energy, 2013, 卷号: 1, 期号: 1 作者: Bu,Xianbiao; Wang,Lingbao; Li,Huashan \| 收藏 \| 浏览/下载：135/0 \| 提交时间：2019/09/12 Working fluid selection Waste heat Air conditioning Hot spring Organic Rankine-vapor compression Expander
	Study of working fluid selection of organic Rankine cycle (ORC) for engine waste heat recovery 期刊论文 OAI收割 Energy, 2011, 卷号: 36, 期号: 5, 页码: 3406-3418 作者: Wang EH; Zhang HG; Fan BY; Ouyang MG; Zhao Y(赵颖) 收藏 \| 浏览/下载：57/0 \| 提交时间：2012/03/31 Organic Rankine Cycle Waste Heat Recovery Working Fluid Engine Matlab Performance Analysis Dry Fluids Power Optimization Expander Design System
	Far-field focusing of laser beam based on digital image processing techniques (EI CONFERENCE) 会议论文 OAI收割 Optoelectronic Imaging and Multimedia Technology, October 18, 2010 - October 20, 2010, Beijing, China 作者: Zhao S.; Tian Y.-Z.; Liu L.-S.; Guo J.; Zhang H.-Y. 收藏 \| 浏览/下载：26/0 \| 提交时间：2013/03/25 In order to lead the laser beam transmit in the atmosphere convergently an experiment of laser focus at the distance of 450m and 300m has been operated in the outdoor place. The actual manipulations are as follows: Firstly the laser was collimated by a beam expander then the near-parallel laser beam was transmitted with a Galileo telescope system and the distance between the concave lens and the convex lens can be tuned through a precise displacement platform so the focus of the system changed due to the tiny displacement of the concave lens. Secondly the average power of the laser spot can be measured using power meter the power is 47.67mW and the standard deviation is 0.67mW while the focal length is 450m. Thirdly the energy distribution was found through the laser beam analyzer. The spot images were saved using the beam analyzer then the saved image can be processed with Matlab software afterwards. The function named EDGE and Sobel operator was used in the pre-processing of the saved image then method of median filter was used in the course of image de-noising and 53H filter was adopted in the signal analysis. The diameter of laser spot was obtained by the method above the diameter is 5.56mm and the standard deviation is 0.24mm. The spot center excursion is 0.56mm it is 10.43% of the total diameter of the laser spot. At last the key factors of the energy dissipation in the focusing system can be summarized as follows: restriction of the diffraction limit attenuation in the atmosphere geometrical aberration of optical system and the diffraction limit and the geometrical aberration are significant in the three factors above so we can reduce the impact of the both factors during the design of optical system. The reliable referenced data of the system design can be acquired through the primary experiment research. 2010 SPIE.
	Study on LD-pumped Nd:YAG laser cutter (EI CONFERENCE) 会议论文 OAI收割 ICO20: Lasers and Laser Technologies, August 21, 2005 - August 26, 2005, Changchun, China 作者: Zhang G.; Zhang G.; Zhang G.; Zhang J.; Zhang J. 收藏 \| 浏览/下载：22/0 \| 提交时间：2013/03/25 The theory of laser cutter and the technology neck is analyzed. We can conclude that it is almost impossible to deal with the waste thick silicon wafers which are yielded in producing silicon wafers by conventional eroding or diamond cutting when the cutting velocity equals 100mm/min while it is also unperfected with ecumenical laser cutter without good beam quality or precise laseroptics system. It is represented that high average power and high repetition rate laser with good beam quality and precise laseroptics system are pivotal to obtain excellent cutting effect such as thick groove depth double-layer 0.75mm thick silicon wafer can be penetrated.. The cross section is fine and the groove is narrow rapid cutting speed the cutting quality meets the expecting demand. fine kerf section without considering the effect of technique. Considering laser medium thermal lens effect and thermal focal length changing with pumping power using plano-convex high reflectivity mirror as the back cavity mirror to compensate the heat lens influence a /4 waveplate to compensate heat -induced birefraction utilize the Nd:YAG self- aperture effect more than 50 W average power 1.064 um IR output is obtained with beam quality factor (M2) equals 3.19. Through the LD-Pumped Nd:YAG laser cutter we developed with short focus length negative spherical aberration focusing lens double axis linear step motor positioning system suitable beam expander multiplying factor appropriate diameter of exit beam aperture proper repetition rate when the cutting velocity equals 400mm/min 0.75mm thick silicon wafer can be penetrated