Signal optimization, noise reduction, and systematic error compensation methods in long-path DOAS measurements

1998 ◽  
Author(s):  
Emilio Simeone ◽  
Alessandro Donati
Keyword(s):  
Systematic Error ◽  
Noise Reduction ◽  
Error Compensation ◽  
Signal Optimization ◽  
Compensation Methods

scholarly journals A Non-Delay Error Compensation Method for Dual-Driving Gantry-Type Machine Tool

Processes ◽  
2020 ◽  
Vol 8 (7) ◽  
pp. 748
Author(s):  
Qi Liu ◽  
Hong Lu ◽  
Xinbao Zhang ◽  
Yu Qiao ◽  
Qian Cheng ◽  
...  
Keyword(s):  
Machine Tool ◽  
Error Compensation ◽  
Prediction Method ◽  
Compensation Method ◽  
Industrial Robots ◽  
Numerical Control ◽  
Heavy Duty ◽  
Positioning Errors ◽  
Compensation Methods ◽  
Type Machine

The drive at the center of gravity (DCG) principle has been adopted in computer numerical control (CNC) machines and industrial robots that require heavy-duty and quick feeds. Using this principle requires accurate corrections of positioning errors. Conventional error compensation methods may cause vibrations and unstable control performances due to the delay between compensation and motor motion. This paper proposes a new method to reduce the positioning errors of the dual-driving gantry-type machine tool (DDGTMT), namely, a typical DCG-principle-based machine tool. An error prediction method is proposed to characterize errors online. An algorithm is proposed to quickly and accurately compensate the errors of the DDGTMT. Experiment results verify that the non-delay error compensation method proposed in this paper can effectively improve the accuracy of the DDGTMT.

Error Analysis of a Novel Resolver-to-Digital Converter

2012 ◽  
Vol 542-543 ◽  
pp. 695-698
Author(s):  
Wen Jing He ◽  
Xiao Wen Xu ◽  
Zhong Ke Shi
Keyword(s):  
Error Analysis ◽  
Error Compensation ◽  
Digital Converter ◽  
Compensation Methods ◽  
Signal Characteristics ◽  
Accuracy And Stability

In this paper, a software-based resolver-to-digital converter using tangent algorithm is proposed. Meanwhile, three main non-ideal signal characteristics which cause the error of the presented resolver-to-digital converter are individually discussed, and the error compensation methods are given. The results show that the proposed strategies effectively improve the accuracy and stability of the system.

Systematic error compensation in electronic speckle pattern shearing interferometry

2006 ◽  
Author(s):  
R. Rodríguez-Vera ◽  
R. R. Cordero ◽  
F. Labbe ◽  
J. A. Rayas ◽  
Amalia Martínez ◽  
...  
Keyword(s):  
Systematic Error ◽  
Error Compensation ◽  
Speckle Pattern ◽  
Shearing Interferometry

Phase error compensation methods for high-accuracy profile measurement

2016 ◽  
Vol 27 (4) ◽  
pp. 045201 ◽  
Author(s):  
Zewei Cai ◽  
Xiaoli Liu ◽  
Xiang Peng ◽  
Zonghua Zhang ◽  
Hao Jiang ◽  
...  
Keyword(s):  
Error Compensation ◽  
Phase Error ◽  
High Accuracy ◽  
Profile Measurement ◽  
Accuracy Profile ◽  
Compensation Methods

Systematic Error Compensation Based on a Rational Function Model for Ziyuan1-02C

2015 ◽  
Vol 53 (7) ◽  
pp. 3985-3995 ◽  
Author(s):  
Yong-hua Jiang ◽  
Guo Zhang ◽  
Peng Chen ◽  
De-ren Li ◽  
Xin-ming Tang ◽  
...  
Keyword(s):  
Systematic Error ◽  
Rational Function ◽  
Error Compensation ◽  
Function Model

scholarly journals Gamma Precorrection and Phase Error Compensation Methods Based on Three-Frequency with Three-Phase Shift

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Wei Feng ◽  
Shaojing Tang ◽  
Shinan Xu ◽  
Tong Qu ◽  
Daxing Zhao
Keyword(s):  
Phase Shift ◽  
Error Compensation ◽  
Phase Error ◽  
Three Dimensional ◽  
Harmonic Component ◽  
Measurement Technology ◽  
Compensation Methods ◽  
Three Phase ◽  
Phase Calculation ◽  
Fringe Patterns

Digital fringe projection measurement technology has been widely used in computer vision and optical three-dimensional (3D) measurement. Considering the phase error caused by the gamma distortion and nonlinear error, the active gamma precorrection and phase error compensation methods based on the three-frequency with three-phase shifts are designed to reversely solve the initial phase and accurately compensate phase error. On the one hand, the gamma coefficient of the measurement system depends on precoding two groups of fringe sequences with different gamma coefficients to calculate the corresponded proportional coefficient of harmonic component. On the other hand, the phase error compensation method is designed to compensate the phase error and improve the accuracy and speed of phase calculation after gamma correction. Experiments show that the proposed precalibration gamma coefficient method can effectively reduce the sinusoidal error in nearly 80 percent which only needs fewer fringe patterns. Compared with the traditional three-frequency with four-phase shift method, the proposed method not only has higher phase accuracy and better noise resistance but also has good robustness and flexibility, which is not limited to the gamma distortion model.

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