This paper addresses high-resolution ultrasonic image reconstruction from Full Matrix Capture (FMC) data in the context of nondestructive testing (NDT). In order to reduce numerical complexity, time-domain and model are projected into domain through a linear beamforming procedure. The resulting is interpreted as shift-variant convolution process, affected by non-stationary colored noise. An int...

The optimization problem of ultrasonic testing instrument is studied in this paper. Using ultrasonic nondestructive testing technology to detect quality of products or parts, because the function of conventional ultrasonic testing instruments is custom-built and defined by manufacturers, it is very difficult to meet ever-changing testing requirements such as testing accuracy, testing efficiency...

Drilling boreholes is common practice in geotechnical and geoenvironmental investigations and in various other ex­ ploration, testing, and monitoring appli­ cations. When a casing is placed in a borehole an annular space is created be­ tween the casing and the surrounding soil. If not properly sealed, this annular space can be a potential path for trans­ port of contaminants in the subsurface e...

A technique for nondestructive detection of small cracks in polycrystalline silicon substrates used for solar cells was demonstrated. A millimeter wave signal of 110 GHz was used and the amplitude of the reflection coefficient was measured. To increase the testing speed, a slit aperture sensor was used. The crack was detected effectively, while the testing speed was 50×35 mm/s. The experimental...

Ultrasonic guided waves are used to detect the delamination between skin and honeycomb of a composite helicopter rotor blade. Theoretical work is carried out for guided waves in the trailing edge of a rotor blade, which is a multilayer composite skin/NOMEX half space structure. The dispersion relation is obtained with the global matrix method. Theoretically driven experiments are conducted on a...

The development of a Transmission-Line Matrix (TLM) for the simulation of ultrasound and microwave propagation in structures common in Nondestructive Testing (NDT) is described. The spatial resolution of the proposed model is better than a tenth of a wavelength. Numerical modeling was carried out for frequencies commonly used in ultrasound and microwave nondestructive testing (3.5MHz – 20GHz). ...

Introduction Nondestructive testing (NDT) of structures and mechanical parts is increasingly receiving attention as the need to monitor the health of aging infrastructure and quality controls on the manufacturing of mechanical parts is becoming more apparent. NDT is defined as using various tools, whether they be acoustic, electromagnetic, or thermally based, to inspect the structural integrity...

Recent and ongoing NDT activities in the automotive industry are surveyed. Application areas include body structures, powertrain components, chassis components, and fuel systems. Examples are drawn from various NDT modalities but with an emphasis on ultrasonics. The business case for NDT and the manner in which it is applied are strongly influenced by the automotive sector's production volumes,...