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A simple sensor head based on a single fiber Bragg grating (FBG) for simultaneous measurement of strain and temperature is proposed. The FBG, inscribed on the fusion splicing joint region between a single-mode fiber and a side-hole fiber, has two Bragg resonant wavelengths, which respond differently to strain and temperature. Strain-temperature discrimination and simultaneous measurement are therefore...
We report on the experimental comparison of piezoresistive MEMS sensors and optical fiber Bragg grating sensors (FBGS) for strain measurements in force sensors. To our knowledge, this is the first direct comparison of piezoresistive and FBG transducers as force sensors. Cantilevers are used as deformation elements. The sensors are bonded on top and bottom side of the cantilever using a heat-curing...
By now, fiber Bragg gratings (FBGs) represent a well assessed technology in both communications and sensing fields. In particular, thanks to their small signal bandwidth and wavelength encoded information, they allow simple measurements in reflection for sensing purposes and also easy multiplexing capability in realizing sensors arrays. Unfortunately, to make FBGs sensitive to surrounding-medium refractive...
Strain and temperature sensitivities of a type I Bragg grating inscribed in a germania doped silica fiber, fabricated under normal conditions and zero strain, are compared with that of a Bragg grating inscribed under pre-strained condition. The results obtained reveal that the strain and temperature sensitivities of the two gratings are different. Based on these results, we demonstrate a technique...
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