The use of guided Lamb waves in nondestructive testing allows a faster and more sensitive inspection when compared with other ultrasound techniques. The process is not easy to carry on because of the multimodal and dispersive nature of guided Lamb waves. This paper explains all the procedures to image linear defects machined in an aluminum plate in detail. An angle adjustable ultrasonic transducer was used to generate the Lamb guided wave for inspection. The technique is effectively able to determine the po...
英字タイトル:
3-D Imaging of Cracks in Metal Plate with Guided Waves Generated by Angle Adjustable Ultrasonic Probe

The magnetic field sensors based on the tunnel magneto-resistive effect (TMR) present enhanced characteristics such as the high sensitivity and a good linearity. They can distinguish the two orientations along a single direction of measurement and don’t need a DC field to set the working point. In this article we shall use TMRs to measure the small magnetic field in the context of an eddy current inspection of a planar aluminum material. The magnetic field disturbance due to the presence of a flaw is measur...
英字タイトル:
Determining the 2D eddy current distribution with magnetic field　measurements on two different directions