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Related Experiment Video

Updated: Feb 14, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

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Instability of projection light source and real-time phase error correction method for phase-shifting profilometry.

Cheng Chen, Yingying Wan, Yiping Cao

|February 25, 2018

Summary

Instability of projection light source (IPLS) causes time-dependent phase errors in phase-shifting profilometry (PSP). New methods effectively correct these errors, enabling robust and accurate 3D shape measurements.

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Area of Science:

Optics and Photonics
Metrology
Computer Vision

Background:

Phase-shifting profilometry (PSP) is a key technique for 3D shape measurement.
Instability of projection light source (IPLS) introduces significant time-dependent phase errors.
Existing methods struggle to address these dynamic errors effectively.

Purpose of the Study:

To systematically investigate the time-dependent phase error induced by IPLS in PSP.
To develop a novel mathematical model for analyzing IPLS-induced phase errors.
To propose and validate real-time correction methods for mitigating these errors.

Main Methods:

A specialized experimental setup was designed to investigate IPLS.
A new mathematical model was formulated and experimentally verified.
Two novel real-time phase error correction algorithms were developed and implemented.

Main Results:

The study successfully characterized the time-dependent phase error caused by IPLS.
The proposed mathematical model accurately describes the error dynamics.
Experimental validation confirmed the effectiveness of the two real-time correction methods in eliminating phase errors.

Conclusions:

The developed real-time correction methods significantly improve the accuracy and robustness of PSP.
These methods offer a promising solution for high-accuracy 3D shape measurements in dynamic environments.
The findings contribute to advancing metrology techniques for precision engineering.