A Novel Induction ‐Type Pressure Sensor based on Magneto‐Stress Impedance and Magnetoelastic Coupling Effect for Monitoring Hand Rehabilitation

A novel induction-type pressure sensor based on magneto-stress impedance and magnetoelastic coupling effect is proposed. The sensor exhibits a wide sensing range (up to 1 MPa), excellent robustness (over 15 000 cycles), fast response/recovery, and superior linearity within 100 kPa. When integrated into a split-fingerboard, the sensor with a capacitor can monitor hand rehabilitation effectiveness sensitively and robustly. AbstractVisualization of training effectiveness is critical to patients ’ confidence and eventual rehabilitation. Here, an innovative magnetoinductive pressure sensor is proposed for monitoring hand rehabilitation in stroke hemiplegic patients. It couples the giant magneto and stress-impedance effects of a square spiral amorphous wire with the giant magnetoelastic eff ect of a polymer magnet (NdFeB@PDMS). The addition of the magnetoelastic layer results in a sensitivity improvement of 178%, a wide sensing range (up to 1 MPa), fast response/recovery times (40 ms), and excellent mechanical robustness (over 15 000 cycles). Further integration with anLC oscillation circuit enables frequency adjustment into the MHz range resulting in a sensitivity of 6.6% kPa−1 and outstanding linearity (R2 =  0.99717) over a stress range of up to 100 kPa. When attached to a commercial split-fingerboard, the sensor is capable of dynamically monitoring the force in each finger, providing a reading of the rehabilitation process. Unlike conventional inductive sensors, the senso...
Source: Small - Category: Nanotechnology Authors: Tags: Research Article Source Type: research