An Efficient Ultrasonic SAFT Imaging for Pulse-Echo Immersion Testing

Ultrasonic NDT of wind turbine blades using contact pulse-echo immersion testing with moving water container

Wind turbine blades are complicated objects for inspection because they have a curved surface, are multi-layered, have variable thickness and are made from anisotropic materials. Ultrasonic contact pulse-echo immersion testing with moving water container has been selected for inspection of wind turbine blades, because this type of the inspection can be performed having access just from the one ...

Performance of Ultrasonic Imaging with Frequency Domain Saft (f-saft)

The time and Fourier domain Synthetic Aperture Focusing Technique (SAFT and FSAFT) have been used to improve both sensitivity and lateral resolution of ultrasonic NDT. Following acquisition of signals over the surface of the tested piece, SAFT identifies a defect by summing all the signals within a certain area (the aperture) after giving proper time-delays. FSAFT, although using the same data,...

Near Real Time Ultrasonic Pulse Echo Holographic Imaging System

Application of Radar and Ultrasonic Pulse Echo for Testing Concrete Structures

Nondestructive testing of concrete structures is one of the essential task for estimating or assessing the quality. In order to validate the advanced NDT equipments like Radar and Pulse Echo, a unique large scale reinforced concrete specimen was cast at SERC, Chennai, with columns and beams of different sizes, cross section having different percentages of reinforcement. The defects such as hone...

Cepstrum - based Deconvolution Techniques for Ultrasonic Pulse - echo Imaging of Flaws in Composite Laminates

Ultrasonic imaging is a powerful nondestructive evaluation (NDE) tool for flaw characterization. This thesis discusses the signal processing techniques developed for ultrasonic imaging of flaws in composite laminates. Commonly used time-domain signal processing techniques have problems including poor resolution, dependence on operator's experiences and subjectivity. Some transform-domain proces...