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	Design and analysis of auto-focus assembly for spaceborne remote sensing camera (EI CONFERENCE) 会议论文 OAI收割 2011 International Conference on Electronics, Communications and Control, ICECC 2011, September 9, 2011 - September 11, 2011, Ningbo, China 作者: Chen W.; Gao X. 收藏 \| 浏览/下载：30/0 \| 提交时间：2013/03/25 Spaceborne remote sensing camera may be out of focus when the environment and photographic distance changes. In order to get higher ground sampled distance for the camera based on the experience gained from the development of a remote sensing camera working principle of auto-focus assembly control system was discussed. Time of waveform extraction was reduced. It sets force an auto-focus assembly that uses cam and line guide rail in order to move the lens group. The motion error of the auto-focus assembly was difficult to be eliminated and would affect on the focusing accuracy of the spaceborne remote sensing camera directly. So it was analyzed at both ends of the focusing structure. The CCD detector can keep stable when the remote sensing camera is imaging. The motion error was tested to verify the validity of the simulation result and it is less than 0.01mm. Its accuracy meets using demand. The focusing method of moving focal plane is suitable for spaceborne remote sensing camera. 2011 IEEE.
	Self-organized Propagation of Femtosecond Laser Filamentation in Air 期刊论文 OAI收割 Self-focusing: Past and Present, 2009, 卷号: 114, 页码: 323 Zhang, J; Hao, ZQ; Xi, TT; Lu, X; Zhang, Z; Yang, H; Jin, Z; Wang, ZH; Wei, ZY 收藏 \| 浏览/下载：69/0 \| 提交时间：2013/09/24 LONG-DISTANCE PROPAGATION PLASMA CHANNELS ACOUSTIC DIAGNOSTICS MOVING-FOCUS PULSES DISCHARGES ULTRASHORT SUPERCONTINUUM GASES GENERATION
	Long-distance femtosecond laser filaments in air 期刊论文 OAI收割 LASER PHYSICS, 2009, 卷号: 19, 期号: 8, 页码: 1769 Zhang, J; Lu, X; Ma, YY; Xi, TT; Li, YT; Sheng, ZM; Chen, LM; Ma, JL; Dong, QL; Wang, ZH; Wei, ZY 收藏 \| 浏览/下载：33/0 \| 提交时间：2013/09/18 LIGHT FILAMENTS MOVING-FOCUS PULSES PROPAGATION IONIZATION SIMULATION RANGE
	Self Imaging technique for refocusing an aerospace camera (EI CONFERENCE) 会议论文 OAI收割 ICO20: Optical Devices and Instruments, August 21, 2005 - August 26, 2005, Changchun, China 作者: Li W.; Li W.; Wang X.; Wang X.; Wang X. 收藏 \| 浏览/下载：34/0 \| 提交时间：2013/03/25 A novel auto-focusing technique using a self imaging approach is developed for an aerospace camera having large aperture and long focus. Its optical system consists of an emitting system receiving system and two penta-prisms. Emitting system has three parts: a light source beamsplitter and aim slit. The receiving system includes a field lens two separate lenses and CCD. Using two little penta-prisms instead of a large planar mirror makes the autofocus system simple and compact. CCD was used as photoelectric converting device. A defocused signal is acquired by measuring the change of the two slit self-images position imaged on the CCD. A simple and compact construction of the auto-focusing system was proposed. The algorithm to calculate the moving of the slit-self images position was analyzed in order to achieve subpixel position estimation. The results of the experiments show a 10m focusing precision. The system demonstrates high resolution easy adjustment and high reliability.