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Open AccessArticle

Displacement and Strain Measurement up to 1000 °C Using a Hollow Coaxial Cable Fabry-Perot Resonator

Department of Electrical and Computer Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA
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Sensors 2018, 18(5), 1304; https://doi.org/10.3390/s18051304
Received: 28 March 2018 / Revised: 19 April 2018 / Accepted: 19 April 2018 / Published: 24 April 2018
(This article belongs to the Special Issue Resonator Sensors 2018)
We present a hollow coaxial cable Fabry-Perot resonator for displacement and strain measurement up to 1000 °C. By employing a novel homemade hollow coaxial cable made of stainless steel as a sensing platform, the high-temperature tolerance of the sensor is dramatically improved. A Fabry-Perot resonator is implemented on this hollow coaxial cable by introducing two highly-reflective reflectors along the cable. Based on a nested structure design, the external displacement and strain can be directly correlated to the cavity length of the resonator. By tracking the shift of the amplitude reflection spectrum of the microwave resonator, the applied displacement and strain can be determined. The displacement measurement experiment showed that the sensor could function properly up to 1000 °C. The sensor was also employed to measure the thermal strain of a steel plate during the heating process. The stability of the novel sensor was also investigated. The developed sensing platform and sensing configurations are robust, cost-effective, easy to manufacture, and can be flexibly designed for many other measurement applications in harsh high-temperature environments. View Full-Text
Keywords: high temperature; displacement; strain; hollow coaxial cable; Fabry-Perot resonator high temperature; displacement; strain; hollow coaxial cable; Fabry-Perot resonator
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Zhu, C.; Chen, Y.; Zhuang, Y.; Huang, J. Displacement and Strain Measurement up to 1000 °C Using a Hollow Coaxial Cable Fabry-Perot Resonator. Sensors 2018, 18, 1304.

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