Title :
Simultaneously measuring temperature and strain using optical fiber microcavities
Author :
Singh, Harmeet ; Sirkis, James S.
Author_Institution :
3M Bragg Gratings Technol., Bloomfield, CT, USA
fDate :
4/1/1997 12:00:00 AM
Abstract :
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
Keywords :
Fabry-Perot interferometers; demodulation; fibre optic sensors; multiplexing; strain measurement; temperature measurement; temperature sensors; 170 mum; 240 mum; 70 mum; coherence division multiplexing; in-line fiber etalon; intrinsic Fabry-Perot sensor; lead insensitive localized gauge-length dual parameter sensor; optical fiber microcavities; optical fiber sensor; pseudoheterodyning demodulation; sensor configuration; simultaneous measurement; strain measurement; temperature measurement; white light interferometry; Capacitive sensors; Equations; Microcavities; Optical fiber polarization; Optical fiber sensors; Optical fibers; Strain measurement; Temperature measurement; Temperature sensors; Wavelength measurement;
Journal_Title :
Lightwave Technology, Journal of
