scholarly journals Measurement Accuracy of Image Pattern Correlation Method

2001 ◽  
Vol 21 (2Supplement) ◽  
pp. 33-34
Author(s):  
Hidemi YAMADA ◽  
Akira AIKAWA
Keyword(s):  
Measurement Accuracy ◽  
Correlation Method ◽  
Pattern Correlation ◽  
Image Pattern

Using the Simplified 3D DIC Method to Measure the Deformation of 3D Surface

2011 ◽  
Vol 121-126 ◽  
pp. 3945-3949 ◽  
Author(s):  
Shih Heng Tung ◽  
Jui Chao Kuo ◽  
Ming Hsiang Shih ◽  
Wen Pei Sung
Keyword(s):  
Measurement Accuracy ◽  
Good Accuracy ◽  
Correlation Method ◽  
Image Correlation ◽  
2D Digital Image Correlation ◽  
Plate Specimen ◽  
Before And After ◽  
Out Of Plane ◽  
Plane Displacement ◽  
2D And 3D

In recent years, 2D digital image correlation method (DIC) has been widely used in the measurement of plane strain. However, out-of-plane displacement could be induced during the loading and it would affect the measurement accuracy. Thus, a 3D measurement is necessary. This study utilizes a simplified 3D DIC to measure the geometry of an object before and after deformation. Then the finite element concept is involved to determine the strain after deformation. A flat plate specimen with in-plane and out-of-plane displacement is observed. Both 2D and 3D DIC are used to analyze the strain. The results show that using 3D DIC to measure strain is feasible and with a very good accuracy.

scholarly journals Phase and Frequency Matching-based Signal Processing Method for Coriolis Mass Flowmeters

2016 ◽  
Vol 16 (2) ◽  
pp. 62-67 ◽  
Author(s):  
Yaqing Tu ◽  
Yanlin Shen ◽  
Haitao Zhang ◽  
Ming Li
Keyword(s):  
Signal Processing ◽  
Phase Difference ◽  
Cross Correlation ◽  
Measurement Accuracy ◽  
Frequency Estimation ◽  
Correlation Method ◽  
Processing Method ◽  
Transform Method ◽  
Frequency Matching ◽  
Signal Processing Method

AbstractSignal processing precision of Coriolis mass flowmeters affects the measurement accuracy directly. To improve the measurement accuracy of Coriolis mass flowmeters, a phase and frequency matching-based signal processing method for Coriolis mass flowmeters is proposed. Estimated phase difference is obtained by means of frequency estimation, 90° phase shift, generating reference signals and cross-correlation. Simulated results demonstrate that the proposed method has better phase difference estimation and anti-interference performance than the Hilbert transform method, cross-correlation method, data extension-based correlation method, and quadrature delay estimator. Measurement results of Coriolis mass flowmeters verify the effectiveness and superiority of the proposed method in practice.

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