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Flow diagnostics using fibre optics

Vasudevan, B and Padbidri, Srikanth and Kishore, Chandra M (2007) Flow diagnostics using fibre optics. In: Sadhana: Academy Proceedings in Engineering Sciences, 32 (1-2). pp. 7-18.


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Research in the area of flow diagnostics using fibre-optics started in our laboratory in early 1998. The first-ever multi-component wind tunnel balance in the world, working with fibre-optic sensors was built and demonstrated in 1999. Since then, several new applications of the technique in the area of fluid dynamic load measurements have been tried successfully. Very recently, fibre-optic sensors have been effectively used for underwater applications, where conventional measurements are relatively very difficult. Since, different physical perturbations affect optical power flowing in a fibre in differentways, unique signatures can be obtained which allow absolute or relative measurement of the incident disturbances. Immunity to electromagnetic or radio frequency interference, high temperature capability, low fatigue, high sensitivity, small size, good corrosion resistance and the capability to embed sensors within the model surface are some of the very attractive features of fibre-optic based instrumentation systems. In this paper, we describe the results of experiments of aerodynamic load measurements at hypersonic speeds (Mach 8·35 and 7·0) and studies carried out recently in a water tunnel over a lifting hypersonic vehicle with a 2-component fibre-optic strain-gauge balance.

Item Type: Journal Article
Publication: Sadhana: Academy Proceedings in Engineering Sciences
Publisher: Indian Academy of Sciences
Additional Information: Copyright of this article belongs to Indian Academy of Scienes.
Keywords: Aerodynamic loads;Fiber optic sensors;Fluid dynamics;Perturbation techniques;Radio interference;Sensitivity analysis;Strain gages;Wind tunnels
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited: 06 Sep 2007
Last Modified: 19 Sep 2010 04:39
URI: http://eprints.iisc.ac.in/id/eprint/11806

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