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Three-dimensional shape measurement method and system calibration for an annular inner-wall.

Baichun Zhagn, Yifan Jiang, Qingyang Wu

|January 29, 2025

Summary

A new off-axis measurement method captures the full 3D profile of annular inner-walls in one scan. This efficient technique simplifies industrial measurement, offering a practical alternative to complex traditional methods.

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Area of Science:

Industrial Metrology
Optical Measurement Systems
3D Profilometry

Background:

Capturing 3D profiles of annular inner-walls is challenging with current industrial measurement techniques.
Existing methods often require multiple scans, leading to inefficiency and inconvenience.

Purpose of the Study:

To propose an efficient off-axis measurement method for 360° annular inner-wall 3D profile reconstruction.
To develop a corresponding system and a full-field calibration method using ray-tracing.

Main Methods:

An off-axis measurement approach utilizing circular fringe projection.
A single-scan 3D profile reconstruction of the annular inner-wall.
A ray-tracing based full-field calibration method for the system.

Main Results:

The proposed method reconstructs the complete 360° profile in a single scan without movement.
The system offers simple calibration, convenient operation, and eliminates the need for strict coaxial alignment.
Simulation and experimental results validate the method's effectiveness and practicality.

Conclusions:

The developed off-axis measurement system provides an efficient and flexible solution for annular inner-wall 3D profiling.
This approach enhances data integrity and offers a practical alternative for automated industrial measurements.