中国科学院机构知识库网格系统: 检索

HCMonitor: An accurate measurement system for high concurrent network services 期刊论文 OAI收割
CONCURRENCY AND COMPUTATION-PRACTICE & EXPERIENCE, 2021, 页码: 16
作者: Song, Hui; Zhang, Wenli; Liu, Ke; Shen, Yifan; Chen, Mingyu

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收藏 | 浏览/下载：45/0 | 提交时间：2021/12/01

accurate measurement full traffic high concurrency monitor server‐ side latency

An Algorithm for Retrieving Soil Moisture Using L-Band H-Polarized Multiangular Brightness Temperature Data 期刊论文 OAI收割
IEEE Geoscience and Remote Sensing Letters, 2016, 卷号: 13, 期号: 9, 页码: 1295-1299
作者: Cui, Qian; Dong, Xiaolong; Shi, Jiancheng; Zhao, Tianjie; Xiong, Chuan

收藏 | 浏览/下载：51/0 | 提交时间：2017/04/24

ACCURATE DISPLACEMENT MEASUREMENT ERROR REDUCTION DEFORMATION MEASUREMENT MEAN INTENSITY ALGORITHM PATTERNS SCHEME

Centroid localization algorithm based on bicubic interpolation gray square weighted (EI CONFERENCE) 会议论文 OAI收割
2012 3rd International Conference on Advances in Materials and Manufacturing Processes, ICAMMP 2012, December 22, 2012 - December 23, 2012, Beihai, China
作者: Zhou J.

收藏 | 浏览/下载：152/0 | 提交时间：2013/03/25

The 3D coordinates of measured point is embodied in 2D image coordinate of the optical characteristic point via the visual measurement system. Based on the gray square weighted centroid localization algorithm the paper presents bicubic interpolation gray square weighted centroid localization algorithm increases the number of effective pixels around the optical characteristic point imaging center and reduces noise error via the gray square weighted improves the imaging center location accuracy of optical characteristic point realizes the accurate location of the optical characteristic points. Results indicate application of the proposed algorithm to location the standard tolerance along the direction of x is 0.0022 Pixel the standard tolerance along the direction of y is 0.0023 Pixel compared with the others the standard tolerance is minimum and discrete to a lesser degree distancing ideal image point that is the proposed algorithm has higher location accuracy. The maximum tolerance along the direction of x is 0.008 Pixel the one along the direction of y is 0.007 Pixel compared with the other two algorithms the maximum tolerance is minimum.Results indicate that the stability of the proposed algorithm is better. (2013) Trans Tech Publications Switzerland.

Allometric models for leaf area estimation across different leaf-age groups of evergreen broadleaved trees in a subtropical forest 期刊论文 OAI收割
PHOTOSYNTHETICA, 2011, 卷号: 49, 期号: 2, 页码: 219-226
Zhang L (张林); Pan, L (Pan L.)

收藏 | 浏览/下载：16/0 | 提交时间：2012/05/10

LINEAR MEASUREMENTS NONDESTRUCTIVE METHODS WIDTH MEASUREMENT L. ACCURATE REGRESSION CITRUS LENGTH

The research of the accurate measure of static transfer function for the TDI CCD camera (EI CONFERENCE) 会议论文 OAI收割
3rd International Photonics and OptoElectronics Meetings, POEM 2010, November 2, 2010 - November 5, 2010, Wuhan, China
Guo-Ning L.; Long-Xu J.; Jian-Yue R.; Wen-Hua W.; Shuang-Li H.

收藏 | 浏览/下载：24/0 | 提交时间：2013/03/25

In the test course of static transfer function of TDI CCD camera because of the influence that gets environmental and artificial etc. factor the value of static transfer function measured at any time is between unceasing fluctuation so make accuracy reduce. To solve this problem a kind of accurate measurement technique of static transfer function is put forward. First before carrying out the measure of static quiet of transfer function the best test point of transfer function of the TDI CCD camera must be determined it is parallel to guarantee the rectangle target surface of parallel optical pipe and camera focal plane maintenance parallel and again guarantee target strip in rectangle target and TDI CCD in camera focal plane maintenance vertical. TDI CCD catches rectangle target image per 1000 lines of target mark image as a measures sample of static transfer function exclude because of atmosphere tremble twisted vague rectangle target mark image retain 500 distinct and steady target mark image as measure sample set. Then calculate the static transfer function of each measure sample respectively take the average of all static quiet transfer function in measure sample set as the static transfer function of camera. Finally the measure of the static transfer function for TDI CCD camera makes error analysis. Experimental results indicate that the value of the static transfer function of TDI CCD camera measured with this kind of method is 0.2923 with before measurement technique comparison the value of static transfer function has raised 0.02 makes the accuracy of the measure of static transfer function have gotten raising.

Dynamic data fixing for IR target radiation characteristics (EI CONFERENCE) 会议论文 OAI收割
2010 International Conference on Computer, Mechatronics, Control and Electronic Engineering, CMCE 2010, August 24, 2010 - August 26, 2010, Changchun, China
Lihua C.; Juan C.

收藏 | 浏览/下载：27/0 | 提交时间：2013/03/25

The main methods to measure the target IR features are the following two ways: test and then measurement or theoretical and simulation calculation. The former is direct measurement so the results are more accurate but the test is costly and complicated so that it is limited in the application. Theoretical and simulation calculation are widely used in the target IR radiation calibration. Here we give the basic configuration of the calibration platform for measuring the IR radiation of the large area low temperature blackbody source and discuss the calibration flowchart and key technologies for atmospheric transmission correction. The dynamic data are analyzed in real time to determine the IR radiation features in the data fusion subsystem and the experimental results show that the calibration method is feasible and practical. 2010 IEEE.

Level 0 and level 1 data processing for a type of hyper-spectral imager (EI CONFERENCE) 会议论文 OAI收割
2009 International Conference on Optical Instruments and Technology, OIT 2009, October 19, 2009 - October 21, 2009, Shanghai, China
Li X.; Yan C.

收藏 | 浏览/下载：71/0 | 提交时间：2013/03/25

Hyper-spectral imaging (HSI) is a kind of optical remote sensor that can simultaneously obtain spatial and spectral information of ground targets. We are now designing a data processing system for a type of space-borne push-broom HSI then it performs radiometric and spectral calibration based on the ground calibration results and onboard calibration collection. The detailed algorithms for bad pixel replacement which has 128 spectral channels covering the spectral range from 400nm to 2500nm. With its large amount of spectral channels radiometric and spectral calibration were presented. After processing the HSI collects large volume of spectral imaging data need to be efficiently and accurately processed and calibrated. In this paper the digital numbers downlinked from the spacecraft can be converted into at-sensor absolute spectral radiance of ground targets the detailed Level 0 and Level 1 data processing steps for the HSI were presented. The Level 0 processing refers to a set of tasks performed on the data downlinked from the spacecraft thus providing accurate quantified spectral imaging data for various applications. 2009 SPIE. including decoding to extract science data separating the science data into files corresponding to different tasks (e.g. ground imaging dark imaging and onboard calibration) checking data integrity and instrument settings data format conversion and Level 0 files creation. The Level 1 processing performs several steps on Level 0 data. Firstly it corrects the image artifacts (mostly the SWIR smear effect) subtracts the dark background and performs the bad pixel replacement according to the prelaunch measurement

Annular sub-aperture stitching interferometry for testing of large asphreical surfaces (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photoelectronic Detection and Imaging, ISPDI 2007: Optoelectronic System Design, Manufacturing, and Testings, September 9, 2007 - September 12, 2007, Beijing, China
作者: Zheng L.-G.; Zhang X.-J.; Deng W.-J.; Wang X.-K.

收藏 | 浏览/下载：76/0 | 提交时间：2013/03/25

Annular subaperture stitching interferometric technology can test large-aperture and the PV and RMS of residual error of the full aperture phase distribution is 0.027 and 0.0023 high numerical aperture aspheric surfaces with high resolution the relative error of PV and RMS is -0.53% and -0.31% respectively. The results conclude that this splicing model and algorithm are accurate and feasible. So it provides another quantitive measurement for test aspheric surfaces especially for large aperture aspheres besides null-compensation. low cost and high efficiency without auxiliary null optics. In this paper the basic principle and theory of the stitching method are introduced the reasonable mathematical model and effective splicing algorithm are established based on simultaneous least-squares method and Zernike polynomial fitting. The translation errors are eliminated from each subaperture through the synthetical optimization stitching mode it keeps the error from transmitting and accumulating. The numerical simulations have been carried on by this method. As results the surface map of the full aperture after stitching is consistent to the input surface map the difference of PV error and RMS error between them is -0.0074 and -0.00052 ( is 632.8nm) respectively

Accurate measurement of carrier-envelope phase drift for infrared femtosecond laser pulses 期刊论文 OAI收割
opt. express, 2008, 卷号: 16, 期号: 26, 页码: 21383, 21388
Song Liwei; Zhang Chunmei; Wang Jianliang; 冷雨欣; 李儒新

收藏 | 浏览/下载：800/79 | 提交时间：2009/09/18

Accurate measurements Femtosecond pulses Incident lasers Incident pulses Infrared femtosecond lasers Interference fringes Interference measurements Measurement processes Novel schemes Phase drifts Phase jitter Second harmonics Spectral interferences

Fast and accurate measurement of diffusion coefficient by Taylor's dispersion analysis 期刊论文 OAI收割
CHINESE SCIENCE BULLETIN, 2007, 卷号: 52, 期号: 24, 页码: 3325-3332
作者: Zuo Min; Han Yanli; Qi Li; Chen Yi

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收藏 | 浏览/下载：19/0 | 提交时间：2019/04/09

Diffusion Coefficient Aqueous And nonAqueous Samples Taylor's Dispersion Analysis Capillary Electrophoresis Fast And Accurate Measurement