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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Stoyanov, P.G. Doherty, S.A. Grimesa, C.A. Seitz, W.R. |
| Copyright Year | 1965 |
| Abstract | A new type of continuously operating, in-situ, remotely monitored sensor is presented. The sensor is comprised of a thin film array of magnetostatically coupled, magnetically soft ferromagnetic thin film structures, adhered to or encased within a thin polymer layer. The polymer is made so that it swells or shrinks in response to the chemical analyte of interest, which in this case is pH. As the polymer swells or shrinks, the magnetostatic coupling between the magnetic elements changes, resulting in changes in the magnetic switching characteristics of the sensor. Placed within a sinusoidal magnetic field the magnetization vector of the coupled sensor elements periodically reverses directions, generating magnetic flux that can be remotely detected as a series of voltage spikes in appropriately placed pickup coils. One preliminary sensor design consists of four triangles, initially spaced /spl ap/50 /spl mu/m apart, arranged to form a 12 mm/spl times/12 mm square with the triangle tips centered at a common origin. Our preliminary work has focused on monitoring of pH using a lightly crosslinked pH sensitive polymer layer of hydroxyethylmethacrylate and 2-(dimethylamino)ethylmethacrylate. As the polymer swells or shrinks the magnetostatic coupling between the triangles changes, resulting in measurable changes in the amplitude of the detected voltage spikes. |
| Sponsorship | IEEE Magnetics Society |
| Starting Page | 1315 |
| Ending Page | 1317 |
| Page Count | 3 |
| File Size | 352672 |
| File Format | |
| ISSN | 00189464 |
| Volume Number | 34 |
| Issue Number | 4 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1998-07-01 |
| Publisher Place | U.S.A. |
| Access Restriction | One Nation One Subscription (ONOS) |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Chemical sensors Remote monitoring Magnetic sensors Magnetic flux Magnetostatics Couplings Sensor arrays Thin film sensors Polymer films Sensor phenomena and characterization |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
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