Design of thin-structured-light projection system for small-height measurement.

Area of Science:

• Optics and Photonics
• Metrology
• Microscopy

Background:

• Accurate three-dimensional (3D) shape reconstruction is crucial for analyzing micro-scale objects.
• Traditional methods for micro-height measurement can be complex and limited in resolution.
• Developing efficient and precise systems for micro-scale metrology remains an active research area.

Purpose of the Study:

• To propose and demonstrate a thin-structured light projection system for simple setup and high-precision small-height measurement.
• To enable flexible design and easy editing of structured light patterns.
• To achieve accurate 3D shape reconstruction of microscopic objects.

Main Methods:

• Computer-aided design of structured light patterns with adjustable attributes (structure, color, dimensions, motion, brightness, contrast).
• Development of a zoomable optical system capable of projecting thin-structured light fringes with a minimum width of 10 μm.
• Integration of a camera and microscope to form a vision system for capturing structured light patterns.
• Analysis of captured patterns for 3D shape reconstruction.

Main Results:

• Successful projection of thin-structured light patterns with a minimum width of 10 μm.
• Demonstration of the system's suitability for 3D shape reconstruction of microscopic objects.
• Achieved accurate measurement of small heights ranging from tens to hundreds of microns.

Conclusions:

• The proposed thin-structured light projection system offers a simple and effective solution for micro-scale 3D shape reconstruction.
• The system's flexibility in pattern design and its high-resolution projection capabilities make it ideal for metrology applications.
• This technology advances the ability to analyze and characterize micro-objects with unprecedented precision.