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Plate Wall Offset Measurement for U-Shaped Groove Workpieces Based on Multi-Line-Structured Light Vision Sensors.

Yaoqiang Ren^1,2, Lu Wang³, Qinghua Wu^1,2

¹School of Mechanical Engineering, Hubei University of Technology, Nanli Road, Wuhan 430068, China.

Sensors (Basel, Switzerland)

|February 26, 2025

Summary

This study introduces a novel vision sensor method for precisely measuring plate wall offset in U-shaped grooves. The technique achieves high accuracy, crucial for assembling large cylindrical structures.

Keywords:

cylindrical shell assembly local distance calculation between planes multi-line structured light vision sensor calibration plate wall offset measurement

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Area of Science:

Mechanical Engineering
Metrology
Computer Vision

Background:

Accurate measurement of plate wall offset is critical for the assembly of large cylindrical shell arc segments.
Traditional measurement methods face challenges in precision and efficiency for U-shaped groove geometries.

Purpose of the Study:

To develop and validate a robust measurement method for determining plate wall offset in U-shaped grooves.
To assess the accuracy and uncertainty of the proposed vision sensor system.

Main Methods:

A multi-line-structured light vision sensor system was designed and calibrated.
Laser stripe analysis was used to extract point cloud data from U-shaped groove regions.
A spatial plane computation method was employed to calculate the plate wall offset.

Main Results:

The vision sensor system demonstrated a measurement uncertainty of ±0.015 mm for a standard sphere.
Plate wall offset measurements showed an uncertainty of ±0.013 mm within a 95% confidence interval.
Results closely agreed with reference values obtained from articulated arm measurements.

Conclusions:

The proposed multi-line-structured light vision sensor method is effective for measuring plate wall offset in U-shaped grooves.
The system offers high precision and reliability for industrial assembly applications.
This method provides a valuable tool for quality control in the manufacturing of cylindrical structures.