Abstract
Magnetoelastic sensors, typically made of magnetostrictive and magnetically-soft materials, can be fabricated from commercially available materials into a variety of shapes and sizes for their intended applications. Since these sensors are wirelessly interrogated via magnetic fields, they are good candidates for use in both research and industry, where detection of environmental parameters in closed and controlled systems is necessary. Common applications for these sensors include the investigation of physical, chemical, and biological parameters based on changes in mass loading at the sensor surface which affect the sensor’s behavior at resonance. To improve the performance of these sensors, optimization of sensor geometry, size, and detection conditions are critical to increasing their mass sensitivity and detectible range. This work focuses on investigating how the geometry of the sensor influences its resonance spectrum, including the sensor’s shape, size, and aspect ratio. In addition to these factors, heterogeneity in resonance magnitude was mapped for the sensor surface and the effect of the magnetic bias field strength on the resonance spectrum was investigated. Analysis of the results indicates that the shape of the sensor has a strong influence on the emergent resonant modes. Reducing the size of the sensor decreased the sensor’s magnitude of resonance. The aspect ratio of the sensor, along with the bias field strength, was also observed to affect the magnitude of the signal; over or under biasing and aspect ratio extremes were observed to decrease the magnitude of resonance, indicating that these parameters can be optimized for a given shape and size of magnetoelastic sensor.
Highlights
Magnetoelastic sensors are ideal for remote query of environmental conditions in closed and controlled systems because they can be fabricated and scaled into different shapes and sizes, functionalized with a wide array of chemical/biological sensing elements, and remotely activated and interrogated [1,2]
The aspect ratio of the sensor, along with the bias field strength, was observed to affect the magnitude of the signal; over or under biasing and aspect ratio extremes were observed to decrease the magnitude of resonance, indicating that these parameters can be optimized for a given shape and size of magnetoelastic sensor
The operation of a magnetoelastic sensor is based on its magnetostrictive behavior, which allows it to undergo cyclic mechanical vibrations at its resonance frequency when exposed to an alternating magnetic field
Summary
Magnetoelastic sensors are ideal for remote query of environmental conditions in closed and controlled systems because they can be fabricated and scaled into different shapes and sizes, functionalized with a wide array of chemical/biological sensing elements, and remotely activated and interrogated [1,2]. The sensor [27] as well asdetection another system study determining the effects of quality thin polymeric coatings Understanding and optimizing these parameters will be critical for developing this techon the resonance behavior of the sensor [28]; Saiz et al recently published multiple expernology for use in dynamic and volumetric environments, such as a bioreactor. Have investigated triangular-shaped senmass detection: Sagasti et al recently published a study investigating the effects of size and aspect ratio on several parameters related to the andof magnetic activity of the sensors and non-uniform coatings as a means of increasing theresonance sensitivity magnetoelastic sor [27]. Variations in sensitivity across the tio’s impact on sensor response and determined the optimal magnetic bias field for sensensors’ surface were investigated, and sensors of different geometries were rotated in sors of different sizes and aspect ratios. Materials and Methods sensor response and determined the optimal magnetic bias field for sensors of different sizes and aspect ratios
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