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Sensors 2016, 16(12), 2037; doi:10.3390/s16122037

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

1,2,†,* , 1,2,†
,
1,2,* , 1,2
,
3
,
1,2
,
1,2
and
1,2
1
Key Laboratory of Instrumentation Science & Dynamic Measurement, Ministry of Education, North University of China, Taiyuan 030051, China
2
Science and Technology on Electronic Test and Measurement Laboratory, North University of China, Taiyuan 030051, China
3
Department of Mechanical & Electrical Engineering, Xiamen University, Xiamen 361005, China
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Academic Editor: Stephane Evoy
Received: 14 August 2016 / Revised: 18 November 2016 / Accepted: 24 November 2016 / Published: 1 December 2016
(This article belongs to the Special Issue Resonator Sensors)
View Full-Text   |   Download PDF [4337 KB, uploaded 4 December 2016]   |  

Abstract

The temperature sensor presented in this paper is based on a microwave dielectric resonator, which uses alumina ceramic as a substrate to survive in harsh environments. The resonant frequency of the resonator is determined by the relative permittivity of the alumina ceramic, which monotonically changes with temperature. A rectangular aperture etched on the surface of the resonator works as both an incentive and a coupling device. A broadband slot antenna fed by a coplanar waveguide is utilized as an interrogation antenna to wirelessly detect the sensor signal using a radio-frequency backscattering technique. Theoretical analysis, software simulation, and experiments verified the feasibility of this temperature-sensing system. The sensor was tested in a metal-enclosed environment, which severely interferes with the extraction of the sensor signal. Therefore, frequency-domain compensation was introduced to filter the background noise and improve the signal-to-noise ratio of the sensor signal. The extracted peak frequency was found to monotonically shift from 2.441 to 2.291 GHz when the temperature was varied from 27 to 800 °C, leading to an average absolute sensitivity of 0.19 MHz/°C. View Full-Text
Keywords: temperature sensing; dielectric resonator; relative permittivity; high-temperature environment temperature sensing; dielectric resonator; relative permittivity; high-temperature environment
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Xiong, J.; Wu, G.; Tan, Q.; Wei, T.; Wu, D.; Shen, S.; Dong, H.; Zhang, W. Dielectrically-Loaded Cylindrical Resonator-Based Wireless Passive High-Temperature Sensor. Sensors 2016, 16, 2037.

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