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Qiulin Tan1,2, Yanjie Guo3,4, Lei Zhang5,6

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

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Summary
This summary is machine-generated.

This study introduces a novel wireless sensor using a substrate integrated circular waveguide (SICW) for high-temperature environments. The sensor demonstrates reliable temperature monitoring up to 1200°C with a sensitivity of 0.197 MHz/°C.

Keywords:
CPW-fed antennaharsh environmentresonant frequencysubstrate integrated waveguidewireless temperature sensor

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Area of Science:

  • Electromagnetic sensing
  • Materials science
  • Harsh environment instrumentation

Background:

  • Traditional sensors face limitations in extreme temperature conditions.
  • Wireless sensing offers advantages for remote and hazardous environments.
  • Substrate Integrated Waveguide (SIW) technology enables compact and robust sensor designs.

Purpose of the Study:

  • To develop and validate a novel wireless temperature sensor for harsh environments.
  • To investigate the performance of a Substrate Integrated Circular Waveguide (SICW) based sensor.
  • To characterize the sensor's response to high temperatures.

Main Methods:

  • Fabrication of a wireless sensor using 99% alumina ceramic and SICW structure.
  • Integration of a rectangular aperture antenna for electromagnetic wave transmission.
  • Testing the sensor's resonant frequency and quality factor across a temperature range of 30-1200°C.
  • Utilizing a broadband coplanar waveguide (CPW)-fed antenna for interrogation.

Main Results:

  • The sensor exhibited a resonant frequency shift from 2.371 GHz to 2.141 GHz between 30°C and 1200°C.
  • Achieved a temperature sensitivity of 0.197 MHz/°C.
  • Observed a decrease in the quality factor from 3444.6 to 35.028 as temperature increased from 30°C to 1000°C.
  • Demonstrated the principle that increased temperature leads to higher relative permittivity of alumina ceramic, causing a resonant frequency decrease.

Conclusions:

  • The developed SICW-based wireless sensor is suitable for temperature measurements in harsh environments.
  • The sensor's performance is directly correlated with the temperature-dependent dielectric properties of the alumina ceramic.
  • This technology offers a promising solution for reliable high-temperature wireless sensing applications.