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4 March 2019 Hybrid sensor based on microstructured hollow-core fiber for simultaneous measurement of strain and temperature
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Proceedings Volume 10925, Photonic Instrumentation Engineering VI; 109250Z (2019)
Event: SPIE OPTO, 2019, San Francisco, California, United States
A hybrid sensor based on microstructured hollow core fiber is proposed for the simultaneous measurement of strain and temperature. The fiber, consisting of four silica capillaries with wall thickness of ~1 μm and a cladding with a thickness of ~26 μm, is spliced between two sections of single mode fiber. Using a low arc discharge power to splice the two fibers, a Fabry-Perot interferometer is formed. In this situation, light travels in the hollow core and the behavior of a twowave interferometer is observed. However, when the power of the arc discharge is increased, the structure near the splice area changes, generating new interferometric paths and giving rise to a different spectral response. In this work, sensors with a single degenerated area are analyzed. In such case, both Fabry-Perot and Michelson interferometers are created and different sensitivities to strain and temperature are obtained. The different spectral frequencies are analyzed, enabling the discrimination between the two parameters. For a sensor with a length of ~385 μm, strain sensitivities of 2.46 pm/με and -0.52 pm/με are obtained for the Fabry-Perot and for the Michelson interferometer, respectively. Regarding temperature, a sensitivity of 1.81 pm/°C was attained for the former, whereas for the last the sensitivity was of 42.23 pm/°C. Keywords: Hyb
Conference Presentation
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M. S. Ferreira, J. Bierlich, J. Kobelke, J. L. Pinto, K. Schuster, and K. Wondraczek "Hybrid sensor based on microstructured hollow-core fiber for simultaneous measurement of strain and temperature", Proc. SPIE 10925, Photonic Instrumentation Engineering VI, 109250Z (4 March 2019); doi: 10.1117/12.2508288;

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