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Long-Range Detection of a Wirelessly Powered Resistive Transducer.
1Department of Electrical and Computer Engineering, Michigan State University, East Lansing, MI 48824 USA.
IEEE Transactions on Instrumentation and Measurement
|August 1, 2024
Summary
This study presents a novel wireless sensor for measuring resistance changes remotely. The new device uses a parametric resonator to convert resistance variations into detectable frequency shifts, enabling batteryless, long-distance monitoring.
Area of Science:
- Sensor Technology
- Wireless Measurement
- Resistive Transducers
Background:
- Wire connections and battery replacements are problematic for sensors in confined spaces.
- Existing wireless resistive transducer methods have limitations in range and complexity.
- Resistive transducers offer advantages in availability and direct voltage conversion.
Purpose of the Study:
- To develop a batteryless, wireless method for remote resistance measurement.
- To improve the remote detectability of resistive transducers.
- To enable miniaturized, long-range sensing solutions.
Main Methods:
- Inductively coupling a resistive transducer with a parametric resonator.
- Activating the parametric resonator with wireless pumping power.
- Converting resistance changes into linear frequency shifts of oscillation signals.
Main Results:
- Achieved remote detection of resistance changes over distances up to 20 times the sensor's dimension.
- Demonstrated a sensitivity of 8 kHz frequency shift per 0.1 °C temperature change.
- Maintained good linearity for temperature sensing between 25 °C and 41 °C.
Conclusions:
- A resistance-to-frequency converter for remote detection was fabricated using a wirelessly powered parametric oscillator.
- The developed sensor enables long-distance, batteryless monitoring of resistance variations.
- The concept can be applied to a wide range of resistive transducers for physiological and environmental monitoring.
Keywords:
Frequency modulationnonlinear circuitsoscillatorsresistive sensorswireless power transmissionMore Related Videos
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