[Skip to content]

Time of Flight Diffraction (ToFD) - Appreciation eLearning Package
Time of Flight Diffraction Banner
Innerpage Banner

Time of Flight Diffraction (ToFD) Course

Buy Now - Phone Number CTA

Time of Flight Diffraction (ToFD) - Appreciation eLearning Package

The Time of Flight Diffraction Appreciation eLearning package brings the student into contact with ultrasonic testing even if the testing is conducted by someone else. This could be ultrasonic testing equipment vendors, auditors or supervisors – anyone who works indirectly with ultrasonic testing

This eLearning package gives you 60 days access to the eLearning materials. The training is delivered step by step, one section at a time, but free of any time pressure to complete the individual modules. 

Students completing the full package will be awarded a Certificate of Satisfactory Completion.


The Time of Flight Diffraction (ToFD) eLearning Package is divided in three modules:

  •  Module 1: Basic Ultrasonic Testing Principles

  •  Module 2: Principles Underlying Time of Flight Diffraction (ToFD)

  •  Module 3: Data Analysis

Fee: £350 + VAT

When you have booked your online training, you will receive an email notification with your login details.

Module 1: Basic Principles of Ultrasound and Ultrasound Testing

  • NDT, sound and ultrasound, basic notions, waves, dB system

  • Probes, wedges   
  • Scans and views  
  • UT production, wave propagation, coverage, techniques  
  • Procedures and set-up
  • Calibration
  • Inspection and data management   

Module 2: Principles Underlying Time of Flight Diffraction (ToFD)

  • Butt welds

  • Digital instrument, probes, wedges, scanners

  • Diffraction, refraction, pitch and catch technique

  • Beam spread, limitations

  • Type of scans, views, cursors

  • ToFD set-ups, essential variable

  • Pre-scanning calibration, beam index point, velocity

  • Scanning

  • Calibration of wedge delay, lateral wave removal and straightening

Module 3: Data Analysis

  • B-Scan perspective

  • Lateral wave, backwall and mode-converted backwall signals

  • Effect of beam spread on depth and the backwall signal

  • Indication classification, probe position vs. height, angle vs height

  • Geometrical indications, double-V welds, pipes misalignment, different wall thickness

  • Data quality, calibration, basic analysis, detailed analysis

  • Signal start, grouping, point-like indications

  • Height and depth, top-surface breaking, bottom-surface breaking, embedded

  • Length and position, parabolic shape, elongated and curved

  • Interactive defect viewer: top-surface breaking, bottom-surface breaking, embedded

So that your computer can run the Phased Array eLearning modules you will need the following basic systems:

Operating System
Windows Vista 7, 8 or 10

Internet Explorer 11 or higher (PC)

Silverlight Plug-in

You can get the Silverlight Plug-in using the following link:

Internet connection:
2 MBIT/s


To get an idea of what you can expect when you begin the course, and view some helpful tutorial videos, click the link below:

View the course taster

Please use the latest version of the browser Internet Explorer with Silverlight installed to view the tasters. Videos are best seen in full screen mode, exercises must be in full screen mode to work.