- Address
- 305-0047 1-2-1 Sengen Tsukuba Ibaraki JAPAN [Access]
Research
- Keywords
SQUID, AMR, GMR, NDE, NQR, NMR
1. pT-レベル高感度磁気センサの研究と非破壊評価への応用。 2. 3Dプリンターで作製したチタン合金の欠陥検出、コンクリート構造物の鉄筋腐食評価、ケーブル橋の鋼索腐食評価のための非破壊評価技術の研究。 3. 超伝導量子干渉デバイスとその応用に関する研究 4. 核四重極共鳴に関する研究
PublicationsNIMS affiliated publications since 2004.
Published patent applications
Society memberships
日本非破壊検査協会, 応用物理学会
Research Center for Structural Materials
Research on High-Sensitivity Magnetic Sensors and Nondestructive Testing Technologies
Magnetic sensor, Nondestructive testing (NDT)，Infrared thermography/IRT，Eddy current testing, Corrosion of reinforcing steel
Overview
High-sensitivity magnetic sensors are widely utilized in numerous fields, including materials evaluation, biomagnetism and disease diagnosis, geophysics, communication, automotive, and aerospace. However, the magnetic field resolution of conventional room-temperature magnetic sensors is insufficient for detecting deep defects, measuring biomagnetic fields, and recording fetal magnetocardiograms. To address this limitation, this study develops a compact, high-sensitivity magneto-impedance (MI) sensor operating at the 1 pT-level, and demonstrates the detection of deep-seated defects utilizing this MI sensor.
Furthermore, to achieve the nondestructive evaluation (NDE) of reinforcement corrosion, carbon fiber reinforced plastics (CFRP), and aircraft components fabricated via particle lamination processes, we develop an innovative NDE technology by integrating multiple non-destructive evaluation techniques, such as electromagnetic, ultrasonic, and thermographic testing.
Novelty and originality
• Development of a compact, high-sensitivity magnetic sensor operating at the picotesla (pT) level, featuring a single-cable connection between the sensor unit and the drive circuit.
• Development of an eddy current non-destructive testing (NDT) system utilizing high-sensitivity magnetic sensors to detect deep-seated defects in materials.
• Development of a compact probe for detecting reinforcement corrosion, which enables both power supply and data transfer via a single USB cable connected to a PC.
• Development of an image processing method for thermography to mitigate the effects of specimen surface roughness.
Details
A high-sensitivity magnetic sensor based on FeCoSiB amorphous wire was developed and applied to nondestructive evaluation. The developed magnetic sensor was integrated into an eddy-current testing (ECT) system, enabling sensitive detection of small defects in metallic materials. The ECT system successfully detected defects in 3D-printed Ti alloys and steel plates. Furthermore, the developed ECT method was applied to the evaluation of warm-sprayed Ti-6Al-4V coatings, and its results were compared with those obtained by infrared thermography. These results demonstrate the potential of high-sensitivity magnetic sensing for quantitative nondestructive evaluation of advanced metallic materials and coatings.
A compact and portable eddy-current testing system was developed for nondestructive corrosion evaluation of steel reinforcing bars and steel cables. The system uses an 80-kHz excitation signal and requires only approximately 1 W of power, with a single USB cable providing both power and data transmission. Laboratory experiments demonstrated reliable detection of different levels of steel rebar corrosion, and field measurements on a real cable-stayed bridge confirmed the applicability of the system for on-site inspection. The compact and low-power configuration provides a practical approach for efficient corrosion assessment of reinforced-concrete structures and bridge cables.
Summary
• We have developed a compact, high-sensitivity magnetic sensor and constructed an eddy current non-destructive evaluation (NDE) system utilizing it.
• We aim to develop and commercialize an electromagnetic NDE device that enables the rapid detection of corrosion in steel reinforcement within RC structures and steel wires in bridges.
• By integrating multiple NDE technologies—such as electromagnetic, ultrasonic, and thermography—we will develop innovative non-destructive evaluation systems.
