Direct current force sensing device based on compressive spring, permanent magnet, and coil-wound magnetostrictive/piezoelectric laminate

Chung Ming Leung, Siu Wing Or, Siu Lau Ho

Research output: Journal article publicationJournal articleAcademic researchpeer-review

2 Citations (Scopus)


A force sensing device capable of sensing dc (or static) compressive forces is developed based on a NAS106N stainless steel compressive spring, a sintered NdFeB permanent magnet, and a coil-wound Tb0.3Dy0.7Fe1.92/Pb(Zr, Ti)O3magnetostrictive/piezoelectric laminate. The dc compressive force sensing in the device is evaluated theoretically and experimentally and is found to originate from a unique force-induced, position-dependent, current-driven dc magnetoelectric effect. The sensitivity of the device can be increased by increasing the spring constant of the compressive spring, the size of the permanent magnet, and/or the driving current for the coil-wound laminate. Devices of low-force (20 N) and high-force (200 N) types, showing high output voltages of 262 and 128 mV peak, respectively, are demonstrated at a low driving current of 100 mA peak by using different combinations of compressive spring and permanent magnet.
Original languageEnglish
Article number125003
JournalReview of Scientific Instruments
Issue number12
Publication statusPublished - 1 Dec 2013

ASJC Scopus subject areas

  • Instrumentation

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