Phase error analysis and compensation for nonsinusoidal waveforms in phase-shifting digital fringe projection...

Area of Science:

• Optical Metrology
• 3D Measurement Technologies
• Digital Imaging Systems

Background:

• Digital fringe projection profilometry (FPP) is a key 3D measurement technique.
• Nonlinear intensity responses in FPP systems distort fringe patterns.
• This distortion introduces phase measurement errors in standard algorithms.

Purpose of the Study:

• To theoretically analyze phase errors caused by nonsinusoidal waveforms in FPP.
• To develop a novel algorithm for compensating these phase errors.
• To validate the effectiveness of the proposed compensation method.

Main Methods:

• Theoretical analysis of phase error in FPP systems.
• Development of an iterative phase compensation algorithm.
• Experimental validation using phase-shifting FPP.

Main Results:

• Nonsinusoidal waveforms directly lead to phase measurement errors.
• The proposed iterative algorithm effectively compensates for these errors.
• Experimental results confirm the algorithm's practical applicability.

Conclusions:

• The nonlinear intensity response is a significant source of error in FPP.
• The novel iterative algorithm provides accurate phase error compensation.
• This method enhances the reliability of 3D measurements using phase-shifting FPP.