Instead of using the array probe, the study of 3D image reconstruction using the single probe was done. EMAT single probe has large diameter and large aperture and so the ultrasonic wave propagates not only toward direction z but also x-y directions. An d so the time series of data received by EMAT probe include the information of the flaws not only in z direction but also in x-y direction and it means the image has higher resolution than that can be expected from the sampling space in x-y direction ca n b...
英字タイトル:
The study of 3D image reconstruction using EMAT

Magnetic flux leakage measurements were performed by using a fluxgate sensor. For an artificial defect of 0.3mm width of SS400 steel, changes in p erpendicular magnetic flux leakage B, could be measured at a lift off height of 5mm, and changes in longitudinal magnetic flux leakage B, could be measured at a lift off height of 10mm. For artificial surface defects, magnetic flux density distribution of By was well correlated to the shape o f the defects. In-situ magnetic flux density measurement By for permal...
英字タイトル:
High Accuracy Damage Evaluation Technique Using FG Sensor

Fatigue damage evaluation for austenitic stainless steel SUS304 was performed by electromagnetic non-destructive testings using magnetoresista nce(MR) and eddy current technique(ECT) sensors. The fatigue damage and fatigue crack could be detected by MR and ECT sensors. Especially, by M R sensors, changes in fatigue crack of notched specimens were measured, and by ECT sensors fatigue damage of martensitic transformation of pla in specimens was evaluated. These results were explained by the difference of mar...
英字タイトル:
Fatigue Damage Evaluation of Austenitic Stainless Steel by MR and ECT sensors

Recently, ceramics materials have become used in many industrial fields because of their thermally stability and stiffness. But they have not been employed to manufacture structure parts larger than one meter. The fracture pattern of ceramics materials is usually more instantaneous than that of ordinary materials, such as steel. Conventionally, inspections for improving the qualities of ceramics parts were often do ne with sampled products, not all products, by optical microscope and/or SEM. In this study,...
英字タイトル:
Study of inspection for ceramics materials using X-CT

Evaluation of defect and damage for structural materials of energy device was performed by using ectromagnetic techniques. For degradation of thermal aging magnetic characterization of weld specimens HCM12A was performed. Comparing the specimen aged at 550°C for 2000 hours with that aged at D0°C for 600 hours, it was found that the changes in magnetic flux densities was clearly observed near the eld metal and heat affected zone for the specimen aged at 550°C for 2000 hours. Then the degree of egradation fo...
英字タイトル:
Evaluation of Defect and Damage for Structural Materials of Energy Device by Using Electromagnetic Techniques