Speaker
Description
Composite magnetic materials have been explored for several applications ranging from biomedical to robotics [1]. The ability to incorporate homogeneous and dense nanoparticles in elastomer matrix creates opportunities for the integration with magnetic sensors in flexible electronics [2], providing viable for large area applications. In addition, biocompatibility between the elastomers and liquid interfaces have been explored in magnetic cytometry [3] and tactile sensors for harsh environment applications [4].
In this work, we will discuss the integration of magnetoresistive (TMR) sensors in tactile sensors, and demonstrated in surface texture and environment exploration. The use of magnetic elastomer cilia, able to recognize bending upon touch, in x and y directions, using two pairs of magnetic sensors, sensitive in both directions enables to detect $H_{x}$ and $H_{y}$ [5], for a comprehension of the actions over the sensor surface. The magneto-mechanical model for the cilia bending upon touch is presented, so to obtain values for the pressure from the bending angle. A distributed architecture is also presented, where the sensor point location translates the variations in the field mapping distribution over a 2D surface of an elastomer (continuous skin model). Here a point contact action will deform the field matrix, and the 1D or 2D sensors will identify the application point and orientation of the applied force.
References
[1] D. Makarov, M. Melzer, D. Karnaushenko, and O. G. Schmidt, “Shapeable magnetoelectronics,” Applied Physics Reviews, vol. 3, no. 1. AIP Publishing, p. 011101, Mar. 2016. doi: 10.1063/1.4938497.
[2] J. Gaspar et al., “Flexible Magnetoresistive Sensors Designed for Conformal Integration,” IEEE Transactions on Magnetics, vol. 53, no. 4. Institute of Electrical and Electronics Engineers (IEEE), pp. 1–4, Apr. 2017. doi: 10.1109/tmag.2016.2623669.
[3] S. Cardoso et al., “Challenges and trends in magnetic sensor integration with microfluidics for biomedical applications,” Journal of Physics D: Applied Physics, vol. 50, no. 21. IOP Publishing, p. 213001, Apr. 27, 2017. doi: 10.1088/1361-6463/aa66ec.
[4] A. Alfadhel and J. Kosel, “Magnetic Nanocomposite Cilia Tactile Sensor,” Advanced Materials, vol. 27, no. 47. Wiley, pp. 7888–7892, Oct. 21, 2015. doi: 10.1002/adma.201504015.
[5] P. Ribeiro, M. Neto, and S. Cardoso, “Strategy for Determining a Magnet Position in a 2-D Space Using 1-D Sensors,” IEEE Transactions on Magnetics, vol. 54, no. 11. Institute of Electrical and Electronics Engineers (IEEE), pp. 1–5, Nov. 2018. doi: 10.1109/tmag.2018.2851928.
