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Board Level Integrated Microsystem Design and Associated Technique for Impedance Analysis of Resonator Sensors

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Abstract:

An impedance analysis technique is applied to measure the complex steady-state vibration characteristics of a magnetoelastic sensor. Magnetoelastic sensors belong to the broad class of resonator sensors, equivalent to a LC oscillation circuit. The electronic implementation resulted in an integrated single board embedded system that, when interfaced with a computer, uses a single solenoid coil to characterize sensor resonance behavior in the frequency domain by obtaining the complex (magnitude, phase) impedance spectrum. A theoretical model is able to accurately describe the measured sensor spectrum. The impedance technique is applied to endotoxin detection and monitoring of blood coagulation. The simplicity of the electronics and the flexibility of the software design make the system a simple, low-cost, and functional agile enabling tool for practical use of the sensor technology.

Keywords: FREQUENCY RESPONSE; IMPEDANCE; MAGNETOELASTIC; MICROCONTROLLER; Q FACTOR; RESONANCE FREQUENCY; SENSOR; SPECTRUM

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/sl.2006.053

Publication date: December 1, 2006

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