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	Recovering Missing Trajectory Data for Mobile Laser Scanning Systems 期刊论文 OAI收割 REMOTE SENSING, 2020, 卷号: 12, 期号: 6, 页码: 21 作者: Zhong, Mianqing; Sui, Lichun; Wang, Zhihua; Yang, Xiaomei; Zhang, Chuanshuai \| 收藏 \| 浏览/下载：36/0 \| 提交时间：2021/03/23 mobile laser scanning scanner trajectory point density scanning line
	Femtosecond Laser Inscribed Sapphire Fiber Bragg Grating for High Temperature and Strain Sensing 期刊论文 OAI收割 Ieee Transactions on Nanotechnology, 2019, 卷号: 18, 页码: 208-211 作者: Q.Guo; Y.S.Yu; Z.M.Zheng; C.Chen; P.L.Wang \| 收藏 \| 浏览/下载：31/0 \| 提交时间：2020/08/24 Sapphire fiber Bragg grating,femtosecond laser,line-by-line scanning,structural health monitoring,sensor,Engineering,Science & Technology - Other Topics
	Key techniques of laser direct writing of fine lines on the spherical surface (EI CONFERENCE) 会议论文 OAI收割 ICO20: Optical Design and Fabrication, August 21, 2005 - August 26, 2005, Changchun, China Liang F.; Hu J. 收藏 \| 浏览/下载：25/0 \| 提交时间：2013/03/25 The main principles of laser direct writing (LDW) system for lines on the spherical surface (SS) are discussed. It is pointed out that line profile is determined by the exposure dose distribution which lies on the light intensity distribution of focus plane and the scanning speed. To improve the quality of line profile on the SS several key techniques as follows are introduced. Firstly the unique system configuration four axes mutually intersecting at the center of the SS is adopted which ensures the shape of the focus be maintained circular during the writing period. Secondly an automatic focus system (AFS) with the function of automatic focus in a certain range is introduced. Thirdly to guarantee the linear velocity to accord with the exposure character of the photoresist all the time an efficient arithmetic that controls motors run at appropriate angular velocity in different latitude is developed. Finally to achieve a stable and well-behaved system so as to compensate the velocity instability resulting from unavoidable errors of mechanical and electronics factor a powerful programmable multi-axis controller (PMAC) is utilized as the kernel element of the servocontrol system and the curves of step response and parabolic response achieved by feedforward and PID loop tuning indicate that the location precision and velocity stability have reached a high level. The experimental results of LDW of lines on the SS work piece with a diameter 30 mm and a radius equal to 100 mm are given. The section analysis of the lines on the photoresist by the atomic force microscope (AFM) after exposure and development is performed. The results show that line width is about 3.0 m and the steep sides of the lines are parallel to each other.
	Research on the nonuniformity correction of linear TDI CCD remote camera (EI CONFERENCE) 会议论文 OAI收割 Advanced Materials and Devices for Sensing and Imaging II, November 8, 2004 - November 10, 2004, Beijing, China Ya-xia L.; Zhi-hang H. 收藏 \| 浏览/下载：27/0 \| 提交时间：2013/03/25 Many applications such as industrial inspection and overhead reconnaissance benefit from line scanning architectures where time delay integration (TDI) significantly improves sensitivity[5]. Images with linear response have become the backbone of the imaging industry. But each pixel of the TDI CCD has unique light sensitivity characteristics. Because these characteristics and the lens of the optical system affect camera's linearization and its performance they must be removed through calibration. The process by which a CCD image is calibrated is known as nonuniformity correction. This paper discusses several methods of nonuniformity correction[2]. The first is one-point correction technique which requires only one calibration point. This approach is to shift each curve toward the nominal curve by subtracting the offset from or adding the offset to the average. The second is two-point correction technique which requires two calibration points. Each point is rotated and aligned so that all the detectors have the same response under the same radiance. The third is multipoint correction. It is recommended that more calibration points be implemented at appropriate regions of the response curve. Depend on the linear photoelectric response of the TDI CCD we use two-point calibration and the standard deviations for the images are given before and after the correction.
	Application of a fractal method to quantitatively describe some typical fracture surfaces 期刊论文 OAI收割 MATERIALS TRANSACTIONS JIM, 2001, 卷号: 42, 期号: 1, 页码: 128-131 作者: Li, XW; Tian, JF; Li, SX; Wang, ZG \| 收藏 \| 浏览/下载：18/0 \| 提交时间：2021/02/02 fractal dimension fracture surface quantitative measurement vertical sectioning secondary electron line scanning