Ultrasonic testing using the electromagnetic acoustic transducer (EMAT) has great advantages on remote capabilities, non-contacting device, and robustness to high temperature. In application of thicNness measurements of pipe wall thinning to online monitoring, it is necessary to measure the temperature of pipe wall due to the temperature dependency of sound velocity. For the limitation of the sensor allocation, the multiple sensing using a single device is recommended. TaNing into remind that, this study...
英字タイトル:
Multiple sensing using electromagnetic acoustic transducer

This paper is concerned with risk assessment of pipe wall thinning management. The reliability of the NDT systems is evaluated from probability of detection (POD). The statistical uncertainty of NDT reliability is then represented by a conservative confidence bound on the POD function. The idea is applied to the pipe wall thinning management using electro magnetic acoustic transducer....
英字タイトル:
Reliability Assessment of Pipe Wall Thickness Measurementsusing Electro Magnetic Acoustic Transducer

This paper is concerned with quantitative evaluation of corrosion shape on back surface of Stainless s amples by Electro Magnetic Acoustic Transducer (EMAT). First we summarize numerical studies of the qua ntitative nondestructive evaluation by EMAT. Secondly, a method for recovering corrosion shape is prop osed. Aspect ratio (corrosion height / corrosion radius) is important for recovery a corrosion shape....
英字タイトル:
Identification of Corrosion Shape by EMAT

This paper is concerned with a computational method for evaluating a degradation level of magnetic materials. Applying current to a probe with magnetic yoke, the detecting signal can be measured by pick-up coil attached with the probe. An inspection model is described by a nonlinear Euler equation in two dimensions with the state dependent magnetic permeability. The nonlinear output l east square problem is formulated for identifying the material degradation parameter. Some numerical experiments are summar...
英字タイトル:
Nonlinear Electromagnetic Field Analysis and Its Application to Nondestructive Evaluation in Material Degradation of Steel Samples