7 documents found, page 1 of 1
Fabry-Perot Interferometer Based on Suspended Core Fiber for Detection of Gaseo...
Paixão, Tiago; Nunes, Ana Sofia; Bierlich, Jörg; Kobelke, Jens; Ferreira, Marta S.An optical fiber tip sensor based on a Fabry-Perot interferometer is proposed for the detection of ethanol in the gas phase. The sensor is fabricated by fusion splicing one end of the suspended core fiber to a single mode fiber, whereas the other end is kept open to enable the interaction between the light propagating in the suspended core and the ethanol gas molecules. The sensor was tested with different perc...
Simultaneous measurement of displacement and temperature using a balloon-like h...
Santos, João P.; Bierlich, Jörg; Kobelke, Jens; Ferreira, Marta S.A fiber sensor based on a silica capillary in a balloon-like shape for simultaneous measurement of displacement and temperature is proposed and experimentally demonstrated. The sensor is fabricated by splicing a segment of a hollow-core fiber between two single-mode fibers (SMF) and by creating a balloon shape with the capillary at the top-center position. The SMF-capillary-SMF configuration excites an antireso...
Hybrid sensor based on a hollow square core fiber for temperature independent r...
Pereira, Diana; Bierlich, Jörg; Kobelke, Jens; Ferreira, Marta S.In this work, a hybrid sensor based on a section of hollow square core fiber (HSCF) spliced between two single mode fibers is proposed for the measurement of refractive index of liquids. The sensor, with a length of a few millimeters, operates in a transmission configuration. Due to the HSCF inner geometry, two different interferometers are generated. The first, a Mach-Zehnder interferometer, is insensitive to ...
Optical Fiber Sensor for Monitoring the Evaporation of Ethanol-Water Mixtures
Pereira, Diana; Bierlich, Jörg; Kobelke, Jens; Pereira, Vanda; Ferreira, Marta S.An inline optical fiber sensor is proposed to monitor in real time the evaporation process of ethanol-water binary mixtures. The sensor presents two interferometers, a cladding modal interferometer (CMI) and a Mach-Zehnder interferometer (MZI). The CMI is used to acquire the variations in the external medium refractive index, presenting a maximum sensitivity of 387 nm/RIU, and to attain the variation in the sam...
Negative curvature hollow core fiber sensor for the measurement of strain and t...
Ferreira, Marta S.; Bierlich, Jörg; Kobelke, Jens; Pinto, João L.; Wondraczek, KatrinThree different types of strain and temperature sensors based on negative curvature hollow core fiber (NCHCF) are proposed. Each sensor is produced by splicing a small section of the NCHCF between two sections of single mode fiber. Different types of interferometers are obtained simply by changing the splicing conditions. The first sensor consists on a single Fabry-Perot interferometer (FPI). The remaining two ...
Double antiresonance fiber sensor for the simultaneous measurement of curvature...
Pereira, Diana; Bierlich, Jörg; Kobelke, Jens; Ferreira, Marta S.Antiresonant hollow core fibers (ARHCFs) have gained some attention due to their notoriously attractive characteristics on managing optical properties. In this work, an inline optical fiber sensor based on a hollow square core fiber (HSCF) is proposed. The sensor presents double antiresonance (AR), namely an internal AR and an external AR. The sensor was designed in a transmission configuration, where the sensi...
Simultaneous measurement of refractive index and temperature using a double ant...
Ferreira, Marta S.; Bierlich, Jörg; Kobelke, Jens; Pinto, João Lemos; Wondraczek, KatrinIn this work, an inline sensor based on a double antiresonant hollow core fiber is proposed for the simultaneous measurement of refractive index and temperature. The fiber, consisting of four silica capillaries with wall thickness of ~1.5 um and a cladding with a thickness of ~36.5 um, is spliced between two sections of single mode fiber. The spectral behavior, measured in transmission, results from the combina...