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Fine temperature mapping using optical fibers (Id 298)

No current offer!

The recent development of optical fibers with Bragg grating technology (FBG) [1] allows to measure very small deformation of the fiber, typically due to strain or temperature [2]. The optical fibers are very small (~200μm diameter) and thus present a promising alternative to in-bulk measurement with minimal disturbances of the flow. This new measurement technique is of particular interest in thermally driven flows, where the temperature spatio-temporal distribution provides crucial information about the flow mechanisms. The midterm goal is to use several optical fibers to map a layer of liquid metal for investigation of turbulent superstructures dynamics.

The objective of this project is to benchmark and quantify the performances of a commercial FBG for fine temperature mapping and tracking.

References:
[1] Fiber Bragg gratings, Review of Scientific Instruments, 68, 4309 (1997); https://doi.org/10.1063/1.1148392
[2] Fiber Bragg grating sensors for monitoring of physical parameters: A comprehensive review. Optical Engineering, 59(6), 060901. https://doi.org/10.1117/1.OE.59.6.060901

Scientific context: This project is part of the thematic group on Rayleigh-Bénard convection.

Main tasks:

• set up and calibrate the temperature sensors,
• acquire data on various temperature profile configurations,
• analyse data and optimize the experimental protocol.

Department: Magnetohydrodynamics

Contact: Dr. Su, Sylvie

Requirements

• Basics in data analysis and/or coding (e.g. Python, Matlab or similar)
• Motivation to run an exploratory laboratory experiment
• Good English communication skills (oral and written)

Conditions

Links:

• Rayleigh-Bénard convection