A parallel plate dielectric resonator as a wireless passive strain sensor

Aftab, Taimur; Yousaf, Adnan; Hoppe, Joachim; Stoecklin, Sebastian; Ostertag, Thomas; Reindl, L.

doi:10.1109/sas.2015.7133576

Cited by 10 publications

(2 citation statements)

References 27 publications

(27 reference statements)

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“…Dielectric and microwave cavity resonators that can operate at temperatures up to 700 °C have been used for wireless passive high temperature sensing [ 2 , 3 ]. Studies show the commercial prospects of these sensors, if microminiaturization can be achieved.…”

Section: Introductionmentioning

confidence: 99%

High-Temperature SAW Wireless Strain Sensor with Langasite

Shu

Peng

Yang³

et al. 2015

Sensors

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Two Surface acoustic wave (SAW) resonators were fabricated on langasite substrates with Euler angle of (0°, 138.5°, 117°) and (0°, 138.5°, 27°). A dipole antenna was bonded to the prepared SAW resonator to form a wireless sensor. The characteristics of the SAW sensors were measured by wireless frequency domain interrogation methods from 20 °C to 600 °C. Different temperature behaviors of the sensors were observed. Strain sensing was achieved using a cantilever configuration. The sensors were measured under applied strain from 20 °C to 500 °C. The shift of the resonance frequency contributed merely by strain is extracted from the combined effects of temperature and strain. Both the strain factors of the two SAW sensors increase with rising ambient temperature, and the SAW sensor deposited on (0°, 138.5°, 117°) cut is more sensitive to applied strain. The measurement errors of the two sensors are also discussed. The relative errors of the two sensors are between 0.63% and 2.09%. Even at 500 °C, the hysteresis errors of the two sensors are less than 5%.

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Section: Introductionmentioning

confidence: 99%

High-Temperature SAW Wireless Strain Sensor with Langasite

Shu

Peng

Yang³

et al. 2015

Sensors

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“…Therefore, microwave wireless passive sensors have been a focus of attention owing to their high quality, large sensing distance, lower material requirements, and other advantages. The Leonhard M. Reindl research group at the University of Freiburg achieved torque, strain, and temperature measurements by using a microwave dielectric resonator [ 26 , 27 , 28 ]. However, since the dielectric constant of the dielectric resonator is large, the emission efficiency is affected negatively.…”

Section: Introductionmentioning

confidence: 99%

AlN-Based Ceramic Patch Antenna-Type Wireless Passive High-Temperature Sensor

et al. 2017

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An aluminum nitride (AlN) based patch antenna-type high-temperature wireless passive sensor is reported to operate as both a sensor and an antenna, which integrates in situ measurement/sensing with remote wireless communication at the same time. The sensor is small, easy to manufacture, highly sensitive and has a high operating temperature; it can be used in high-temperature, chemically corrosive and other harsh environments. The sensing mechanism of the sensor, the dielectric constant of the AlN ceramic substrate, increases with rising temperature, which reduces the resonant frequency of the sensor. Thus, the temperature can be measured by detecting changes in the sensor’s resonant frequency. High-Frequency Simulation Structure (HFSS) software is used to determine the structure and size of the sensor, which is then fabricated using thick-film technology. The substrate of the sensor is AlN ceramic due to its outstanding thermal resistance at high temperature; and its conductors (the radiation patch and the ground under the substrate) are silver-palladium alloy sintered form silver–palladium paste. A vector network analyzer reveals that the sensor’s operating range extends to 700 °C. Furthermore, its resonant frequency decreases from 2.20 GHz to 2.13 GHz with increasing temperature from room temperature (25 °C) to 700 °C, with an absolute sensitivity of 104.77 KHz/°C. Our work verifies the feasibility of measuring high temperatures using AlN-based patch antenna wireless passive temperature sensors, and provides a new material and temperature sensitive structure for high-temperature measurement in harsh environments.

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A Dielectric Resonator Inspired Displacement Sensor

Ojha

Kumar

2018

Lecture Notes in Electrical Engineering

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A parallel plate dielectric resonator as a wireless passive strain sensor

Cited by 10 publications

References 27 publications

High-Temperature SAW Wireless Strain Sensor with Langasite

High-Temperature SAW Wireless Strain Sensor with Langasite

AlN-Based Ceramic Patch Antenna-Type Wireless Passive High-Temperature Sensor

A Dielectric Resonator Inspired Displacement Sensor

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