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Dielectrically-Loaded Cylindrical Resonator-Based Wireless Passive High-Temperature Sensor.

Jijun Xiong1,2, Guozhu Wu3,4, Qiulin Tan5,6

  • 1Key Laboratory of Instrumentation Science & Dynamic Measurement, Ministry of Education, North University of China, Taiyuan 030051, China. xiongjijun@nuc.edu.cn.

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Summary
This summary is machine-generated.

This study presents a novel microwave dielectric resonator temperature sensor using alumina ceramic for harsh environments. The sensor wirelessly measures temperature from 27 to 800°C with high sensitivity, validated through simulations and experiments.

Keywords:
dielectric resonatorhigh-temperature environmentrelative permittivitytemperature sensing

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Area of Science:

  • Microwave Engineering
  • Materials Science
  • Sensor Technology

Background:

  • Harsh environments require robust temperature sensors.
  • Dielectric resonators offer potential for high-temperature sensing.
  • Wireless interrogation is desirable for remote monitoring.

Purpose of the Study:

  • To develop and validate a wireless temperature sensor for high-temperature applications.
  • To utilize a microwave dielectric resonator with alumina ceramic substrate.
  • To demonstrate effective signal extraction in a challenging metal-enclosed environment.

Main Methods:

  • Fabrication of a microwave dielectric resonator with an etched aperture on alumina ceramic.
  • Integration with a broadband slot antenna and coplanar waveguide for wireless interrogation.
  • Application of radio-frequency backscattering technique for signal detection.
  • Implementation of frequency-domain compensation for noise filtering.

Main Results:

  • The sensor's resonant frequency monotonically shifted with temperature.
  • Successful wireless detection of the sensor signal was achieved.
  • Temperature variation from 27 to 800°C resulted in a frequency shift from 2.441 to 2.291 GHz.
  • An average absolute sensitivity of 0.19 MHz/°C was obtained.

Conclusions:

  • The developed microwave dielectric resonator sensor is feasible for high-temperature measurements.
  • The system demonstrates reliable performance even in electromagnetically challenging environments.
  • Frequency-domain compensation effectively enhances signal quality for accurate temperature sensing.