Magnetostrictive LC-circuits as mechanical sensors
A remote interrogatable highly sensitive mechanical sensor based on softmagnetic magnetostrictive thin films has been developed. This sensor is very interesting for stress and torque measurements on rotating or hidden objects. It consists of a resonating circuit (LC-tag) with a magnetically sandwiched strip inductor and a thin film capacitor. The resonance frequency of this device is about 500 MHz with quality factors about 8. First measurements with the sensor in a bending test jig have shown high sensitivity to applied strain. A figure of merit (defined as ∆f/f 0/∆ε on the order of 1000 could be obtained.
KeywordsPermeability Anisotropy Torque
Unable to display preview. Download preview PDF.
- 4.C. H. Tyren, D. G. Lord, Magnetoelastic Stress Sensor, United States Patent 5297439, 1994.Google Scholar
- 5.A. Ludwig, M. Tewes, E. Quandt, Sensoren und Mess-Systeme 2002, VDE Verlag Berlin Offenbach, pp. 309–312, 2002.Google Scholar
- 8.A. Sukstanskii, V. Korenivski and A. Gromov, J. Appl. Phys. 89 (1), 2001.Google Scholar