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FBG sensors for low-speed flow analysis

Hegde, G and Suhas, BK and Surendranath, V and Hegde, G and Asokan, S (2022) FBG sensors for low-speed flow analysis. In: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2022, 4 - 10 April 2022, Virtual, Online at Long Beach, California, United States.

Full text not available from this repository.
Official URL: https://doi.org/10.1117/12.2612199


An FBG based pressure and temperature measurement setup was developed for low speed aerodynamics studies. A bare FBG sensor for measuring dynamic pressure of flow and a specially designed strain-insensitive FBG temperature sensor were packaged in the form of a compact probe. The FBG temperature sensor probe was used for both temperature measurement of flow and temperature compensation of bare FBG sensor. The setup was calibrated for pressure and temperature using a calibrated flow generator that could produce low turbulence air jets at different velocities. The FBG sensor assembly was calibrated for flow velocities ranging from 5 m/s to 40 m/s. The flow of jet was arranged to be perpendicular to the axis of FBG sensors. A 2-D fluid structure interaction simulation was carried out in Comsol Multiphysics to validate the experiments. From simulation results, flow induced FBG strain was found to have a linear dependence with dynamic pressure of the flow with a slope of 0.038 µε/Pa. Pressure values determined from FBG experiments were found to be in close agreement with the pressure values obtained from simulation within experimental errors. Because of their diminutive size and flexibility, FBG sensors can be used to measure pressure and temperature in ground based aerodynamic test facilities with minimum intrusion to the flow.

Item Type: Conference Paper
Publication: Proceedings of SPIE - The International Society for Optical Engineering
Publisher: SPIE
Additional Information: The copyright for this article belongs to the SPIE.
Keywords: Aerodynamics; Electric sensing devices; Fiber optic sensors; Fluid structure interaction; Probes; Temperature distribution; Temperature measurement, Dynamic pressures; FBG sensor; FBG temperature sensor; Flow analysis; Fluid-structure interaction; Low-speed flow; Measurement setup; Pressure and temperature; Pressure values; Temperature compensation, Fiber Bragg gratings
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited: 29 Jun 2022 07:39
Last Modified: 29 Jun 2022 07:39
URI: https://eprints.iisc.ac.in/id/eprint/73973

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