机构

• 长春光学精密机械与物... [2]
• 地理科学与资源研究所 [1]
• 自动化研究所 [1]

采集方式

• OAI收割 [4]

内容类型

• 会议论文 [2]
• 期刊论文 [2]

发表日期

• 2023 [2]
• 2009 [1]
• 2007 [1]

学科主题

筛选

浏览/检索结果: 共4条，第1-4条 帮助 条数/页： 5101520253035404550556065707580859095100 排序方式： 请选择题名升序题名降序发表日期升序发表日期降序提交时间升序提交时间降序作者升序作者降序 NIRvP as a remote sensing proxy for measuring gross primary production across different biomes and climate zones: Performance and limitations 期刊论文  OAI收割 INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION, 2023, 卷号: 122, 页码: 11 作者:  Chen, Siyuan;  Sui, Lichun;  Liu, Liangyun;  Liu, Xinjie;  Li, Jonathan   |  收藏  |  浏览/下载：22/0  |  提交时间：2023/10/16 Gross primary production  Light use efficiency  Near-infrared radiation reflected by vegetation  Biomes  Climate zones   Theoretical model and numerical study of effect of target reflected light on high-power fiber laser 期刊论文  OAI收割 ACTA PHYSICA SINICA, 2023, 卷号: 72, 期号: 10, 页码: 13 作者:  Duan, Lei;  Xu, Run-Qin;  Song, Yun-Bo;  Tan, Shu-Dan;  Liang, Cheng-Bin   |  收藏  |  浏览/下载：26/0  |  提交时间：2023/11/17 fiber lasers  reflected light  atmospheric transmission  fiber coupling   Three-dimensional angle measurement based on auto-collimation and moire fringe (EI CONFERENCE) 会议论文  OAI收割 2008 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Applications, November 16, 2008 - November 19, 2008, Beijing, China Cai S.; Liang S.; Qiao Y.-F. 收藏  |  浏览/下载：35/0  |  提交时间：2013/03/25 A method for small three-dimensional (3D) angle measurement based on auto-collimation and moire fringe is proposed and analyzed. A right-angle prism is used as the indicator of angle change. The inclined plane indicates the pitch and yaw angles and roll angle in indicated by the rib which is the intersection of two right-angle sides. Pitch and yaw angles measurement are implemented by auto-collimation based on reticule and roll angle measurement is measured based on moire fringe. Roll angle measurement is separated from pitch and yaw by using two light sources with different frequencies. Any small change of pitch and roll angles will induce the shift of the reticule image after reflecting by inclined plane. And any small roll angle will induce a change in moire fringe width that is generated by scale grating image which is reflected by the prism and index grating. The math model of this method is built up and error analysis is presented. The theoretical calculation results show that the proposed method is feasible and can achieve high accuracy. 2009 SPIE.   The cell thickness and twist angle measurement of twist nematic liquid crystal cell by rotation of a quarter-wave plate using fourier analysis method (EI CONFERENCE) 会议论文  OAI收割 Asia Display 2007, AD'07, March 12, 2007 - March 16, 2007, Shanghai, China Cui H.-Q.; Ling Z.-H. 收藏  |  浏览/下载：26/0  |  提交时间：2013/03/25 Proposed a new method of determining the cell thickness and the twist angle of twisted nematic liquid crystal cells  a quarter-wave plate was inserted between the liquid crystal cell and the analyzer  a stepper motor rotated the Retarder by 360  and measured the light intensity of every modulated point  solved the stokes parameters of polarization light exiting from the liquid crystal cell using Fourier analysis method  thereby determining the cell thickness and the twist angle. Experiments indicated that it is suitable for measuring the low-cell-gap accurately. In addition  it also can be applied to the measurement of the cell thickness and twist angle of single polarizer reflected liquid crystal cell.