Hydrodynamic measurements in water tunnel using enhanced-sensitivity all-fiber Fabry-Perot strain gauges

Huacheng Qiu; Yanguang Yang; Fu Min; Wei Xue; Zengling Ran; Zhiqiang Liu; Zhendong Xie

doi:10.1117/12.2504339

12 December 2018 Hydrodynamic measurements in water tunnel using enhanced-sensitivity all-fiber Fabry-Perot strain gauges

Huacheng Qiu, Yanguang Yang, Fu Min, Wei Xue, Zengling Ran, Zhiqiang Liu, Zhendong Xie

Author Affiliations +

Proceedings Volume 10846, Optical Sensing and Imaging Technologies and Applications; 1084614 (2018) https://doi.org/10.1117/12.2504339
Event: International Symposium on Optoelectronic Technology and Application 2018, 2018, Beijing, China

Abstract

This paper presents high-sensitivity, micro machined all fiber Fabry-Perot Interferometric (FFPI) strain gauges, as well as their applications in water tunnel environment for hydrodynamic measurements. The FFPI strain gauge has a short Fabry-Perot cavity and a long hollow hole next to the cavity, formed by two step laser etching process. Such configuration enables the sensitivity to be enlarged as many as eight times. The deformation of the FFPI strain gauges is measured by the spectrum shift of the reflected optical signal, using a white light optical demodulator. The strain sensitivity is measured to be 0.015 nm/με, and the minimum detectable strain alteration is about 0.07 με in our set-up. A force balance, using the proposed FFPI strain gauges as sensing elements, has been fabricated, calibrated and evaluated in a water tunnel flow, to measure the hydrodynamic loading. Experimental results indicate that, the proposed balance based on the FFPI strain gauge is reliable and robust and is potentially suitable for water environment.

Citation Download Citation

Huacheng Qiu, Yanguang Yang, Fu Min, Wei Xue, Zengling Ran, Zhiqiang Liu, and Zhendong Xie "Hydrodynamic measurements in water tunnel using enhanced-sensitivity all-fiber Fabry-Perot strain gauges", Proc. SPIE 10846, Optical Sensing and Imaging Technologies and Applications, 1084614 (12 December 2018); https://doi.org/10.1117/12.2504339

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