An accurate method to calibrate shadow moiré measurement sensitivity

2019 ◽  
Vol 30 (12) ◽  
pp. 125021
Author(s):  
Wei Zhang ◽  
Fulong Zhu ◽  
Shenghuai Wang ◽  
Pengyan Lu ◽  
Xin Wu
Keyword(s):  
Accurate Method ◽  
Measurement Sensitivity ◽  
Shadow Moire ◽  
Shadow Moiré

scholarly journals Shadow Moiré technique for postural assessment: qualitative assessment protocol by intra- and inter-rater evaluation

2017 ◽  
Vol 29 (2) ◽  
pp. 356-360
Author(s):  
José Nunes da Silva Filho ◽  
Luiz Alberto Batista ◽  
Jonas Lírio Gurgel ◽  
Flávia Porto
Keyword(s):  
Qualitative Assessment ◽  
Assessment Protocol ◽  
Shadow Moire ◽  
Shadow Moiré ◽  
Postural Assessment

scholarly journals Computer-automated shadow moiré method and applications for 3D surface profiling

2021 ◽  
Author(s):  
Rui Zhao
Keyword(s):  
Least Square ◽  
Automated System ◽  
Image Subtraction ◽  
Full Field ◽  
Surface Profiling ◽  
Shadow Moire ◽  
Shadow Moiré ◽  
3D Surface ◽  
Measurement Resolution ◽  
Moire Method

Among numerous methods for 3D surface profiling, classic shadow moiré method has been kept as the most popular one due to its full-field feature and low cost. This thesis focuses on a computer-vision shadow moiré method with a scope to improve the measurement resolution, accuracy and efficiency. The computer automation is basically realized through the introduction of a phase-shifting technique that is incorporated with a new multi-grid least-square unwrapping algorithm. The method is enhanced by implementing a few additional image processing techniques. These techniques, when implemented, result in improved measurement accuracy and enable easy applications to irregularly shaped surfaces. The study also proposes a new, automated system calibration approach that is based on a real-time image subtraction. A data normalization process is studied to resolve possible confusions in the presentation of the original data. The verification test results show that the modified shadow moiré technique has achieved the initial goal, in that the measurement resolution now reaches a few percentage of the fringe sensititivity.

scholarly journals Morphology Evaluation of Microelectronic Packaging Substrates Using Shadow Moiré Technique

IEEE Access ◽  
2018 ◽  
Vol 6 ◽  
pp. 33099-33110
Author(s):  
Fulong Zhu ◽  
Xinxin Lin ◽  
Wei Zhang ◽  
Jiajie Fan ◽  
Sheng Liu
Keyword(s):  
Microelectronic Packaging ◽  
Shadow Moire ◽  
Shadow Moiré

Low-Frequency Vibration Measurement Based on Spatiotemporal Analysis of Shadow Moiré

2011 ◽  
Vol 31 (4) ◽  
pp. 0412005
Author(s):  
史红健 Shi Hongjian ◽  
朱飞鹏 Zhu Feipeng ◽  
何小元 He Xiaoyuan
Keyword(s):  
Low Frequency ◽  
Spatiotemporal Analysis ◽  
Vibration Measurement ◽  
Shadow Moire ◽  
Shadow Moiré ◽  
Low Frequency Vibration

A Multi-Range Merging Method for Phase Shift Shadow Moiré Profilometry with Large Depth Measuring Range

2016 ◽  
Vol 36 (12) ◽  
pp. 1212001
Author(s):  
艾永旭 Ai Yongxu ◽  
周翔 Zhou Xiang ◽  
杜虎兵 Du Hubing ◽  
郭家玉 Guo Jiayu ◽  
费梓轩 Fei Zixuan ◽  
...  
Keyword(s):  
Phase Shift ◽  
Measuring Range ◽  
Large Depth ◽  
Shadow Moire ◽  
Shadow Moiré ◽  
Merging Method

Warpage measurement comparison using shadow Moire and projection Moire methods

2002 ◽  
Vol 25 (4) ◽  
pp. 714-721 ◽  
Author(s):  
Hai Ding ◽  
R.E. Powell ◽  
C.R. Hanna ◽  
I.C. Ume
Keyword(s):  
Shadow Moire ◽  
Shadow Moiré ◽  
Projection Moire
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