STUDY
Core technical concepts and physical theories of ultrasonic testing (UT) and Non-Destructive Testing (NDT).
1. Ultrasonic Testing (UT) Basics
Basic Principles of Ultrasonic Testing (UT)
Summarizes the principles, characteristics, and industrial applications of Ultrasonic Testing (UT), a core non-destructive testing method, from an engineer's perspective.
Principles and Selection Criteria of Frequency in Ultrasonic Testing
Explains the physical definition of frequency, which is the first specification checked when performing Ultrasonic Testing (UT), and how the frequency selection impacts inspection results.
Principles of Calibration in Ultrasonic Testing and the Purpose of Reference Blocks
Explains the calibration process required to measure accurate defect locations and sizes via Ultrasonic Testing (UT), and the physical necessity of reference blocks.
2. Data Visualization & Scan Interpretation
UT Data Representation: A-Scan, B-Scan, and C-Scan
Summarizes the principles, structures, and applications of the three scan visualization methods for data collected by Ultrasonic Testing (UT) equipment from an engineer's perspective.
Fundamentals of Ultrasonic NDT: Principles of A-scan and Graph Interpretation
Based on global NDT technical standards, this article explains in detail how to interpret A-scan graphs—the foundation of ultrasonic technology—and the principles of real-time signal analysis.
Ultrasonic NDT B-scan: Principles and Cross-Sectional Interpretation
Based on global NDT technical standards, this article explains the physical definition of B-scan and provides detailed methods for interpreting 2D cross-sectional graphs displayed on screens.
Ultrasonic NDT C-scan: Principles and Plan View Interpretation
Based on global NDT technical standards, this article explains the physical definition of C-scan and provides detailed methods for interpreting planar projection (top-down view) graphs displayed on screens.
3. Advanced Phased Array Ultrasonic Testing (PAUT)
Basic Concepts of Phased Array Ultrasonic Testing (PAUT)
Summarizes the principles, components, scan modes, and advantages over conventional UT of PAUT, which implements beam steering and focusing through electronic control of multiple piezoelectric elements.
PAUT Wedge and Couplant — Roles and Selection Criteria
This article summarizes the physical roles and selection criteria of wedges and couplants for properly transmitting and receiving ultrasonic energy from PAUT probes to the test object.
UT vs PAUT — What are the Differences?
This article outlines the technical differences, including beam generation, inspection speed, and imaging capabilities, between Conventional Ultrasonic Testing (UT) and Phased Array Ultrasonic Testing (PAUT), along with selection criteria in the field.
PAUT Focal Law — Principles, Components, and Design Methods
This article explains the principles and practical design methods of Focal Laws, which are sets of time-delay parameters that determine the beam steering and focusing performance of PAUT equipment.
PAUT Defect Sizing Techniques
This article summarizes the representative sizing techniques (6dB Drop, TOFD, Tip Diffraction, etc.) used to evaluate the length, height, and depth of defects in NDT and PAUT environments.