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...
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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...
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High Accuracy Damage Evaluation Technique Using FG Sensor

1 緒言カラー セラミックス部材はその剛性と耐熱性において金 属材料くらべ有利である. しかし,その破壊過程は 脆性的であり金属材料のそれと比べ急峻である. 破壊が始まってからではその進行を止めたり遅らせ たりすることはできない. そのため製造直後の欠 陥検査が重要である。部材中の欠陥存在確率はその 体積に比例するので、フリーの大型部材を作成する」 ことは非常に困難である。また、大きな部材の欠陥 検査を行うことも容易ではない。この対策として欠 陥の少ないことが確認された小型部材を接着組み合 わせることで欠......
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Study of non-destructive evaluation for ceramics materials

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,...
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Study of inspection for ceramics materials using X-CT

Abstract In a small diameter piping, stresses are generated due to internal fluid or pump vibrations especially around the welding parts. Authors have successfully de veloped a pipe strain sensor which is able to measure such stresses. Unlike conventional methods using strain gages and adhesive bond, the sensor can measure the stra in without putting adhesive bond on the piping surface. However, the strain sensor can provide measurements with a level of accuracy equivalent to that of conventiona l method u...
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Development of Piping Strain Sensor for Stress Evaluation

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