Verification of dimensional measurement accuracy of XCT

• Main Author: Poon, Keng Yong
• Other Authors: Fan Zheng, David
• Format: Final Year Project
• Language: English
• Published: Nanyang Technological University 2023
• Subjects: Engineering::Manufacturing::Metrology; Engineering::Mechanical engineering::Machine design and construction
• Online Access: https://hdl.handle.net/10356/168302
• Institution: Nanyang Technological University

X-ray computed tomography (XCT) is an increasingly useful tool for non-destructive evaluation (NDE) in various industries. XCT enables the visualization of internal structures of materials and components, allowing for defect detection, quality control, and other critical assessments. However, the use of a maximum permissible error statement as a reliability indicator for XCT measurements is insufficient and can be misleading. The maximum permissible error statement is a widely used method for expressing measurement uncertainty in industrial applications. However, this approach assumes that errors are uniformly distributed across the measurement range, which is not the case for XCT. Therefore, relying solely on a maximum permissible error statement can result in a false sense of confidence in XCT measurements. In this project, a statistical approach to quantify the uncertainty of XCT measurements is being introduced and evaluated using multiple aluminium workpieces for verification. The approach is considered verified if the measurement of these aluminium workpieces, along with their calculated uncertainties, lies within the proposed error range.