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Hypersonic Aerodynamic Force Balance Using Micromachined All-Fiber Fabry–Pérot Interferometric Strain Gauges

1
China Aerodynamics Research and Development Center, Hypervelocity Aerodynamics Institute, Mianyang 621000, Sichuan Province, China
2
University of Electronic Science and Technology of China, Key Lab of Optical Fiber Sensing and Communications, Chengdu 610000, Sichuan Province, China
*
Author to whom correspondence should be addressed.
Micromachines 2019, 10(5), 316; https://doi.org/10.3390/mi10050316
Received: 21 March 2019 / Revised: 28 April 2019 / Accepted: 6 May 2019 / Published: 11 May 2019
(This article belongs to the Special Issue MEMS for Aerospace Applications)
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Abstract

This paper presents high-sensitivity, micromachined all-fiber Fabry–Pérot interferometric (FFPI) strain gauges and their integration in a force balance for hypersonic aerodynamic measurements. The FFPI strain gauge has a short Fabry–Pérot cavity fabricated using an excimer laser etching process, and the deformation of the cavity is detected by a white-light optical phase demodulator. A three-component force balance, using the proposed FFPI gauges as sensing elements, was fabricated, calibrated, and experimentally evaluated. To reduce thermal output of the balance, a simple and effective self-temperature compensation solution, without external temperature sensors, is proposed and examined through both oven heating and wind tunnel runs. As a result of this approach, researchers are able to use the balance continuously throughout a wide range of temperatures. During preliminary testing in a hypersonic wind tunnel with a free stream Mach number of 12, the measurement accuracies of the balance were clearly improved after applying the temperature self-compensation. View Full-Text
Keywords: hypersonic wind tunnel; aerodynamic force balance; all-fiber Fabry–Pérot interferometer; strain gauge; temperature self-compensation hypersonic wind tunnel; aerodynamic force balance; all-fiber Fabry–Pérot interferometer; strain gauge; temperature self-compensation
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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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Qiu, H.; Min, F.; Yang, Y.; Ran, Z.; Duan, J. Hypersonic Aerodynamic Force Balance Using Micromachined All-Fiber Fabry–Pérot Interferometric Strain Gauges. Micromachines 2019, 10, 316.

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