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High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques

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A large-depth-of-field projected fringe profilometry using supercontinuum light illumination.

Wei-Hung Su, Kebin Shi, Zhiwen Liu

|June 5, 2009

Summary

A novel projected fringe profilometry system uses a supercontinuum light source for large depth-of-field measurements. This method offers high accuracy and reduced speckle noise, overcoming limitations of traditional laser systems.

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Area of Science:

Optical Metrology
Nonlinear Optics

Background:

Projected fringe profilometry is a key technique for 3D surface measurement.
Traditional laser-based systems suffer from limited depth-of-field and speckle noise.
Supercontinuum light offers unique properties for optical applications.

Purpose of the Study:

To present a large-depth-of-field projected fringe profilometry system.
To leverage a supercontinuum light source for enhanced profilometry.
To demonstrate a highly accurate and robust 3D surface measurement technique.

Main Methods:

Generating a supercontinuum light source by launching femtosecond laser pulses into nonlinear photonic crystal fiber.
Utilizing the supercontinuum light's high spatial coherence and broad spectrum to create modulated fringe patterns.
Developing a projected fringe profilometer system incorporating the supercontinuum source.

Main Results:

Achieved a large depth-of-field for 3D surface measurements.
Demonstrated ease of calibration for the profilometry system.
Significantly reduced speckle noise compared to conventional laser systems.
Obtained high measurement accuracy.

Conclusions:

A highly accurate, large-depth-of-field projected fringe profilometer is realized using a supercontinuum light source.
The proposed method overcomes the limitations of traditional laser-based profilometry.
The system offers advantages in depth-of-field, calibration, and noise reduction.