Spatiotemporal phase unwrapping and its application in fringe projection fiber optic phase-shifting profilometry

1999 ◽  
Author(s):  
Hong Zhang ◽  
Fang Wu ◽  
Michael J. Lalor ◽  
David R. Burton
Keyword(s):  
Fiber Optic ◽  
Phase Unwrapping ◽  
Phase Shifting ◽  
Fringe Projection

A novel design for fiber optic interferometric fringe projection phase-shifting 3-D profilometry

2001 ◽  
Vol 187 (4-6) ◽  
pp. 347-357 ◽  
Author(s):  
Fang Wu ◽  
Hong Zhang ◽  
Michael J. Lalor ◽  
David R. Burton
Keyword(s):  
Fiber Optic ◽  
Phase Shifting ◽  
Fringe Projection ◽  
Novel Design

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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