A soft ferromagnetic multiwire-based inductance coil sensor for sensing applications
Abstract
We present an effective approach to improve the sensitivity of inductance coil sensors by designing a sensor core that consists of multiple soft ferromagnetic microwires. A systematic study of the longitudinally excited magneto-inductive (LEMI) effect has been performed in a non-magnetic copper wire coil with a filler composed of multiple Co-rich amorphous microwires. Melt-extracted microwires of Co68.2Fe4.3B15Si12.5 and glass-coated microwires of Co68B15Si10Mn7 with excellent soft magnetic properties were used for this study. We have shown that the LEMI ratio and field sensitivity of an inductive coil depend strongly upon the filler-to-air ratio inside the coil, the magnetic softness, and the anisotropy axis distribution of the microwire. Relative to a single-microwire based sensor, the LEMI ratio and field sensitivity of a multi-microwire based sensor are enhanced by three to four times, when varying the number of microwires inside the inductive coil. The sensitivity of the sensor using four glass-coated Co68B15Si10Mn7 microwires in the core reaches a maximum value of 1957%/Oe. Our study paves a pathway for the development of novel room-temperature electric contact free magnetic sensors for use in industry, biomagnetism, space science, and geoscience.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Dec 18, 2014
- Source ID
- 10.1063/1.4904411
Entities
People
- Faxiang Qin
- H. Srikanth
- Haoting Shen
- J. F. Sun
- J. S. Liu
- Jagannath Devkota
- M. H. Phan
- Parijat Mukherjee
- T. Luong
Organizations
- Harbin Institute of Technology
- Inner Mongolia University of Technology
- National Institute for Materials Science
- United States Army Medical Research and Development Command
- University of South Florida