Álvaro Peña, Daniel Matatagui, J. Diego Aguilera, Pilar Marín, Carmen Horrillo
The XIII European Magnetic Sensors and Actuators Conference (EMSA 2022)
Del 5 al 8 de julio de 2022, Madrid, España.
Due to the dependence between magnetic and mechanical properties in magnetostrictive materials, vibrations matching the resonance frequency can be induced through alternating magnetic fields. Considering that this resonance frequency can be affected by changes in a mass deposited over the device (Δf/f0 = -Δm/2m0), these materials can be used to create sensors that operate remotely with little power requirements.
Several devices have been reported demonstrating that the advantages of magnetoelastic sensors can be used for chemical reactions monitoring [1], nanoparticle detection [2], or biomedical applications [3] among many others. However, these devices typically rely on frequency sweep sequences to obtain spectrums from which the resonance frequency is extracted. Each sweep can take several minutes to be acquired, making this methodology unsuitable for fast events monitoring.
The experimental setup proposed here consists of an oscillator circuit based on the resonance frequency of the magnetostrictive sensor (amorphous metallic micro ribbon), which is introduced into the feedback loop of a solidstate amplifier and a filter that determines resonant mode (fundamental frequency, f0). A third coil was used to sample the frequency from the oscillator without interrupting the main power flow. In essence, with this configuration, realtime measurement of the magnetoelastic resonance can be achieved. We aim to use this system on gas sensing applications for human health diagnosis, where fast responsiveness and remote operation are key features.
References:
[1] B. Sisniega et al., Real Time Monitoring of Calcium Oxalate Precipitation Reaction by Using Corrosion Resistant Magnetoelastic Resonance Sensors, Sensors, 20 (2020) 2802.
[2] S. Atalay et al., Magnetoelastic sensor for magnetic nanoparticle detection, Journal of Magnetism and Magnetic Materials, 465 (2018) 151-155.
[3] K. Yu et al, Wireless Magnetoelasticity-Based Sensor for Monitoring the Degradation Behavior of Polylactic Acid Artificial Bone In Vitro, Appl. Sci., 9 (2019) 739.
