Sensors 2016, 16(12), 2037; https://doi.org/10.3390/s16122037
Dielectrically-Loaded Cylindrical Resonator-Based Wireless Passive High-Temperature Sensor
Jijun Xiong 1,2,†,*
, Guozhu Wu 1,2,†
, Qiulin Tan 1,2,*
, Tanyong Wei 1,2, Dezhi Wu 3, Sanmin Shen 1,2, Helei Dong 1,2 and Wendong Zhang 1,2
, Qiulin Tan 1,2,*
, Tanyong Wei 1,2, Dezhi Wu 3, Sanmin Shen 1,2, Helei Dong 1,2 and Wendong Zhang 1,21
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)
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-TextKeywords:
temperature sensing; dielectric resonator; relative permittivity; high-temperature environment
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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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