Measurement of the deposition morphology using temporal phase-shifting laser speckle interferometry

2019 ◽  
Author(s):  
Shuhua Li ◽  
Yuanbo Li ◽  
Xiaoqian Cui ◽  
Ding Wu ◽  
Dongye Zhao ◽  
...  
Keyword(s):  
Speckle Interferometry ◽  
Laser Speckle ◽  
Phase Shifting ◽  
Temporal Phase ◽  
Deposition Morphology

Recent advances in temporal phase-shifting speckle interferometry

2003 ◽  
Author(s):  
Pablo D. Ruiz ◽  
Jonathan M. Huntley ◽  
Guillermo H. Kaufmann
Keyword(s):  
Speckle Interferometry ◽  
Phase Shifting ◽  
Temporal Phase ◽  
Recent Advances

scholarly journals An Error-Reduction Method for Temporal Phase Unwrapping Based on Double Three-Step Phase-Shifting and Least-Squares Fitting

2012 ◽  
Vol 6-7 ◽  
pp. 76-81
Author(s):  
Yong Liu ◽  
Ding Fa Huang ◽  
Yong Jiang
Keyword(s):  
Least Squares ◽  
Reduction Method ◽  
Intermediate Phase ◽  
Error Reduction ◽  
Phase Unwrapping ◽  
Phase Shifting ◽  
Surface Measurement ◽  
Acquisition Time ◽  
Least Squares Fitting ◽  
Temporal Phase

Phase-shifting interferometry on structured light projection is widely used in 3-D surface measurement. An investigation shows that least-squares fitting can significantly decrease random error by incorporating data from the intermediate phase values, but it cannot completely eliminate nonlinear error. This paper proposes an error-reduction method based on double three-step phase-shifting algorithm and least-squares fitting, and applies it on the temporal phase unwrapping algorithm using three-frequency heterodyne principle. Theoretical analyses and experiment results show that this method can greatly save data acquisition time and improve the precision.

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