Construction and error source analysis of seawater absorbance measurement system

2021 ◽  
Vol 29 (8) ◽  
pp. 1751-1758
Author(s):  
Zhuang-zhuang MU ◽  
◽  
qiang ZHAO ◽  
Jin LI ◽  
Fan-li MENG ◽  
...  
Keyword(s):  
Measurement System ◽  
Source Analysis ◽  
Error Source ◽  
Absorbance Measurement

Study on Error Analysis of On-Line Measurement System Based Numerical Control Process

2013 ◽  
Vol 454 ◽  
pp. 102-105
Author(s):  
Hai Dong Ren ◽  
Er Bao Peng
Keyword(s):  
Image Processing ◽  
Error Analysis ◽  
Measurement System ◽  
Control Process ◽  
Numerical Control ◽  
Error Source ◽  
Image Preprocessing ◽  
Geometrical Error ◽  
Line Measurement ◽  
On Line

The error analysis of the on-line measurement system used in the processing parts of numerically-controlled machine is investigated, and the image processing technilogy is analyzed through the investigations on error source, error analysis and geometrical error analysis, in which, much consideraton is paid to the image treatment and the object margin extracting process conducted to the images segmented and disposed in terms of image preprocessing and segmentation. Therefore, such an investigation is of great importance to enhance the machining precision of parts.

A Calibration Approach for Installation Error of Multi-Axis Laser Interferometer

2017 ◽  
Author(s):  
Shengwu Du ◽  
Jinchun Hu ◽  
Yu Zhu ◽  
Chang Tian ◽  
Ming Zhang
Keyword(s):  
Laser Beam ◽  
Computational Model ◽  
Measurement System ◽  
Laser Interferometer ◽  
Measurement Information ◽  
Error Source ◽  
Reference Axis ◽  
Ultra Precision ◽  
Simulation Results ◽  
Calibration Approach

Multi-axis laser interferometer is generally employed in measuring multi-degree-of-freedom (M-DOF) displacement for many ultra-precision X-Y stages. In multi-axis measurement system, the installation deviation of interferometer laser beam is an important error source. In this paper, a novel calibration approach without other higher precision sensors has been presented, to calibrate the installation deviation in a 3-DOF displacement measurement system, with potential capability of calibrating 6-DOF measurement system. In the proposed method, one redundant measuring axis that is set as installation reference axis is added to the original 3-axis measurement system. Correspondingly, considering the installation deviations of 3-axis interferometer, a new displacement computational model with four equations is built. In this model, all installation deviations are constants and the displacement values are variable. Utilizing the redundant measurement information of three position points, the installation deviations are separated. The simulation results validate its feasibility. This approach can strictly ensure the parallelism and perpendicularity between measuring axes, and is easily applied to engineering.

scholarly journals Error Source Analysis and Precision Assessment of Limit Equilibrium Methods for Rock Slopes

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Xiaofan An ◽  
Ning Li ◽  
Peng Zhang ◽  
Wenbo Sun
Keyword(s):  
Finite Element ◽  
Evaluation Method ◽  
Progressive Failure ◽  
Limit Equilibrium ◽  
Influence Factors ◽  
Source Analysis ◽  
Rock Slopes ◽  
Error Source ◽  
Sliding Surfaces ◽  
Limit Equilibrium Methods

The approximate assumptions of limit equilibrium methods are the fundamental cause of the deviation between their calculation results and actual situation. This study proposes a new finite-element evaluation method to reflect the progressive failure characteristics of rock slopes. By comparing the results of limit equilibrium and finite-element methods, the influence factors of stability for planar landslides are systematically studied. The factors include the plastic parameters of sliding surfaces in progressive failure, the elastic parameters of sliding mass, the elastic deformation of sliding beds, and excavation stress release. Moreover, the stress distribution rules on sliding surfaces and the diversity of safety factors are explored. Finally, the error source and calculation accuracy of the limit equilibrium method in slope analysis are obtained. The study provides scientific references for analyzing and evaluating the stability of such slopes.

The error source analysis of oil spill transport modeling: a case study

2013 ◽  
Vol 32 (10) ◽  
pp. 41-47 ◽  
Author(s):  
Yan Li ◽  
Jiang Zhu ◽  
Hui Wang ◽  
Xiaodi Kuang
Keyword(s):  
Oil Spill ◽  
Transport Modeling ◽  
Source Analysis ◽  
Error Source

scholarly journals Error Source Analysis and Correction of GF-3 Polarimetric Data

2018 ◽  
Vol 10 (11) ◽  
pp. 1685 ◽  
Author(s):  
Sha Jiang ◽  
Xiaolan Qiu ◽  
Bing Han ◽  
Jili Sun ◽  
Chibiao Ding
Keyword(s):  
Correction Method ◽  
Test Phase ◽  
Synthetic Aperture ◽  
Source Analysis ◽  
Error Source ◽  
Disaster Reduction ◽  
Error Sources ◽  
Polarimetric Synthetic Aperture Radar ◽  
External Calibration ◽  
Ocean Monitoring

The GaoFen-3 (GF-3) satellite is the first polarimetric synthetic aperture radar (PolSAR) satellite in China. With a designed in-orbit life of 8 years, it will provide large amounts of PolSAR data for ocean monitoring, disaster reduction, and many other applications. The polarimetric data quality is essential for all these applications, so the analysis and calibration of the polarimetric error sources are very important for GF-3. In this study, we established a full-link error model for GF-3 PolSAR system. Based on this model, we comprehensively analyzed the quantitative effects of the main error sources including the composition, figured out characteristics of the phase imbalance introduced by the antenna, and pointed out the error sources which have to be corrected. Furthermore, the polarimetric correction method for GF-3 PolSAR system is proposed. Finally, assisted by several external calibration experiments, polarimetric errors of GF-3 data are efficiently corrected during in-orbit-test phase.

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