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We developed ECT systems using high-sensitivity magnetic sensors with small size; and used the systems to evaluate a titanium alloy sample prepared by a 3D laser printer. The magnetic sensor was constructed using an amorphous wire with the diameter of 0.1 mm and the length of 5 mm. The magnetic field resolution was about 30 pT/√Hz. For the ECT system, a small excitation coil was also wrapped around the amorphous wire, and the excitation frequency was chosen to be 100 kHz. The image of the scanning result shows that the ECT method was able to detect the positions of flaws in the test sample. We also compared the results with that of traditional ECT system with inductive coilprobe.
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