Real-time monitoring of position and motion of a non-stationary object with a highly sensitive magnetic impedance sensor

• Main Authors: Thiabgoh, O., Eggers, T., Jimenez, V.O., Jiang, S.D., Sun, J.F., Phan, M.H.
• Format: Article
• Language: English
• Published: H. : ĐHQGHN 2018
• Subjects: Real-time monitoring; Position and speed sensor; Oscillatory motion; Vibration monitoring; RF magnetic sensor; High-frequency magneto-impedance
• Online Access: http://repository.vnu.edu.vn/handle/VNU_123/62850; https://doi.org/10.1016/j.jsamd.2018.01.006
• Institution: Vietnam National University, Hanoi

The real-time monitoring of the position and speed of a moving object is crucial for safety compliance in industrial applications. The effectiveness of current sensing technology is limited by sensing distance and messy environments. In this work, a position and speed sensor based on the giant magneto-impedance effect was fabricated using a Joule annealed Co-rich magnetic microwire. The fabricated GMI sensor response was explored over a frequency range of 1 MHze1 GHz. The impedance spectrum showed a high GMI ratio and highfield sensitivity response at low magneticfields. The GMI sensor based longitudinal effect was found to be more sensitive than a commercial Gaussmeter. The practical utility of the high sensitivity of the sensor at weak magneticfields for far-off distance monitoring of position and speed was demonstrated. This GMI-based sensor is highly promising for real-time position detection and oscillatory motion monitoring.