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Magnetoelastic Sensors for Biomedical Monitoring

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A remote-query (wireless, passive) sensor system is presented for continuous, real-time in-situ and in-vivo monitoring, with specific application to monitoring pH. The magnetoelastic sensor is comprised of a ribbon-like magnetostrictive ferromagnetic alloy strip, approximately 7 mm × 2 mm × 25 m in size, that can be monitored over a 16 cm distance. When excited with a time-varying magnetic field the sensor vibrates at a characteristic resonance frequency. The mechanical vibrations of the magnetostrictive sensor launch a time-varying magnetic flux that allows the sensor to be remotely detected with an inductor, or pick-up coil. Monitoring of pH is achieved by coating a sensor with a layer of pH-responsive, mass/elasticity-changing polymer. As the pH of the surrounding medium varies, the mass and/or elasticity of the polymer layer changes, shifting the resonance frequency of the sensor. This paper presents the design and fabrication of the pH-sensitive polymer, sensor, plastic capsule that protects the sensor, as well as the detection electronics.
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Document Type: Research Article

Publication date: 2005-06-01

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