A wireless, passive load cell based on magnetoelastic resonance

A wireless, battery-less load cell was fabricated based on the resonant frequency shift of a vibrating magnetoelastic strip when exposed to an AC magnetic field. Since the vibration of the magnetoelastic strip generated a secondary field, the resonance was remotely detected with a coil. When a load...

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Bibliographic Details
Published in:Smart materials and structures 2012-07, Vol.21 (7), p.75018
Main Authors: Pereles, Brandon D, Dienhart, Thomas A, Sansom, Thadeus M, Johnston, Kyle, Ong, Keat Ghee
Format: Article
Language:English
Subjects:
Exact sciences and technology
General equipment and techniques
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Physics
Sensors (chemical, optical, electrical, movement, gas, etc.)
remote sensing
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Summary:A wireless, battery-less load cell was fabricated based on the resonant frequency shift of a vibrating magnetoelastic strip when exposed to an AC magnetic field. Since the vibration of the magnetoelastic strip generated a secondary field, the resonance was remotely detected with a coil. When a load was applied to a small area on the surface of the magnetoelastic strip via a circular rod applicator, the resonant frequency and amplitude decreased due to the damping of its vibration. The force sensitivity of the load cell was controlled by changing the size of the force applicator and placing the applicator at different locations on the strip's surface. Experimental results showed that the force sensitivity increased when a larger applicator was placed near the edge of the strip. The novelty of this load cell is not only its wireless passive nature, but also the controllability of the force sensitivity.
ISSN:0964-1726
1361-665X
DOI:10.1088/0964-1726/21/7/075018