Ayako AKUTSU’s research while affiliated with Institute of Science Tokyo and other places

... Variations in the material's properties, including electrical conductivity [12][13][14], magnetic permeability [15,16], and geometry [17][18][19][20], influence the distribution of these eddy currents and the impedance of the testing probe. Typically, the probe is in the form of a coil containing a ferrite core to increase its sensitivity and inspection efficiency [21][22][23][24]. For aluminide coatings, which are electrically conductive but nonmagnetic, changes in coating thickness or the presence of defects alter the eddy current behavior, enabling the detection and characterization of such anomalies [7]. ...

Reference:

High frequency eddy current method in inspection of aluminide coatings integrity after simulating service loads

... Various non-destructive testing methods such as ultrasonic testing, X-ray diffraction, and eddy current testing have been developed and employed for structural health monitoring of steel structures [3][4][5][6]. Among these, the eddy current testing has been selected in the present study because it is a non-contact method that does not require the use of coupling agent nor surface preparation such as clearing off the top rust layer, thus proving itself time and cost efficient, particularly for field inspection of large structures with damages such as corrosion and cracking that are widespread [6,7]. ...

Reference:

Evaluation of Eddy Current Response Due to the Applied Stress on a Steel Plate Using Phase Diagram

... For example, wheeled robots, which are limited to inspecting horizontally flat surfaces (e.g., bridge decks) with several NDT methods, are described in [21,22]. For locations that are difficult to access, other forms of propulsion were used in which the robotic platform stays in contact with the concrete surface [23][24][25][26]. However, these robots might be limited to applications where the robot remains on a continuously smooth surface and must be manually moved around a corner (e.g., from a column to the underside of a bridge). ...

Reference:

Non-destructive corrosion inspection of reinforced concrete structures using an autonomous flying robot