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Simultaneously measuring temperature and strain using optical fiber microcavities

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2 Author(s)
Singh, H. ; 3M Bragg Gratings Technol., Bloomfield, CT, USA ; Sirkis, J.S.

Presents an optical fiber sensor capable of simultaneously measuring both axial strain and temperature. The sensor configuration is composed of a 70 μm in-line fiber etalon (ILFE) cascaded with a 170 μm intrinsic Fabry-Perot (IFP) sensor to form a lead in-sensitive, localized, 240 μm gauge-length dual parameter sensor. The sensor response from this configuration is interrogated using coherence division multiplexing based on white light interferometry, and using pseudoheterodyning demodulation. The results obtained in a simultaneously varying temperature and strain field by the fiber sensor are compared with a semiconductor temperature gauge and a resistance strain gauge. The correlation is very good

Published in:

Lightwave Technology, Journal of  (Volume:15 ,  Issue: 4 )

Date of Publication:

Apr 1997

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