Abstract
We demonstrate an all-fiber optical Fabry–Perot interferometer (FPI) strain sensor whose cavity is a microscopic air bubble. The bubble is formed by fusion splicing together two sections of single-mode fibers (SMFs) with cleaved flat tip and arc fusion induced hemispherical tip, respectively. The fabricated interferometers are with bubble diameters of typically . Strain and temperature sensitivities of fabricated interferometers are studied experimentally; a strain sensitivity of over and a thermal sensitivity of less than is obtained.
©2012 Optical Society of America
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