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Wireless Passive LC Temperature and Strain Dual-Parameter Sensor.

Ya Wang1, Qiulin Tan1, Lei Zhang1

  • 1Science and Technology on Electronic Test and Measurement Laboratory, North University of China,Taiyuan 030051, China.

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|January 5, 2021
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Summary
This summary is machine-generated.

This study introduces a novel wireless passive sensor for simultaneous temperature and strain monitoring in high-speed rotating systems. The device utilizes a single inductor with two capacitors for accurate, multiplexed measurements in harsh environments.

Keywords:
rotating systemtemperature-strain sensorwireless

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Area of Science:

  • Electrical Engineering
  • Materials Science
  • Mechanical Engineering

Background:

  • High demand for real-time bearing monitoring in high-speed rotating machinery.
  • Existing sensors often lack wireless, passive capabilities or struggle with multiplexed measurements.
  • Need for robust sensors that can withstand adverse environmental conditions.

Purpose of the Study:

  • To develop a novel multiresonance, multiplexing, wireless, passive inductance capacitance (LC) sensor for simultaneous temperature and strain monitoring.
  • To optimize sensor design for frequency separation of signals and minimize mutual interference.
  • To demonstrate the sensor's stable performance and suitability for high-temperature rotating parts.

Main Methods:

  • Design of a sensor with two capacitors on a single inductor for dual LC resonant circuits.
  • Optimization using High Frequency Structure Simulator (HFSS) for signal isolation.
  • Fabrication on a flexible polyimide film using electroplating.
  • Experimental validation of temperature and strain sensing capabilities.

Main Results:

  • Stable operation from 25 °C to 85 °C with a temperature sensitivity of 27.3 kHz/°C.
  • Strain detection in the range of 1000-5000 με with a sensitivity of 100 Hz/με at 25 °C.
  • Demonstrated stable performance and reduced sensor area due to single inductor design.
  • Flexible substrate enables conformal attachment for monitoring rotating components.

Conclusions:

  • The proposed wireless passive LC sensor effectively achieves simultaneous temperature and strain monitoring.
  • The sensor's design offers stable performance, reduced size, and adaptability to challenging environments.
  • This technology is well-suited for critical applications in high-speed rotating systems requiring reliable condition monitoring.