1,721,061 research outputs found
Curvature Sensor Based on FBGs Embedded in 3D Printed Patches
No full textIn this paper, a novel curvature sensor, is showed. The proposed sensor is based on two FBGs, properly embedded in a 3D printed patch: the FBGs measure the strain in two point at a different distance from the monitored structure and the curvature of the structure under test is estimated from the difference in their strain. The simple and compact sensor exhibits a curvature sensitivity of 1.39 nm/m-1 with a resolution equal to . The curvature test shows a very excellent agreement between the curvature recorded with the new sensing device and that of the reference sensor. Neutral axis position of the monitored structure can be also estimated with this sensor
Arc-Induced Long Period Gratings in Erbium-Doped Fiber
No full textIn this paper, we report about the fabrication of long period gratings (LPGs) directly into an Erbium-doped fiber, by using the electric arc discharge technique. The attention is focused on the writing process and the resulting properties, by considering gratings with different periods and measuring their spectra over a wide wavelength range. The LPGs show high order attenuation bands with tunable resonance wavelengths and depths up to 30 dB, while the lengths of the final devices are in range 20-45 mm. The polarization-dependent loss of these LPGs is also measured, for the first time in this kind of fiber. As further novelty, the influence of surrounding refractive index, applied strain, and temperature is investigated and discussed in comparative manner. Based on the achieved results, this fabrication procedure can be adapted to a specific application, for example in optical communications, signal processing, and sensing fields
Study of Fiber Bragg Gratings Embedded in 3D-Printed Patches for Deformation Monitoring
Full text linkAim of this work is the analysis of the 3D printed patches embedding fiber Bragg gratings (FBGs) for deformation monitoring. In particular, the paper first describes the manufacturing process and the performances of FBGs embedded in PLA and ABS rectangular patches, showing that the sensitivity to temperature is strongly dependent on the material and on the dimension of the patches. Then, the deformation characteristics are, for the first time, explored showing that the thickness of the patch, influencing the neutral axis position, acts as gaining factor on the deformation sensitivity of the FBG sensor. Such results enable the application of FBG embedded in 3D-printed patches for deformation monitoring taking in proper consideration the dimension of the patches, in particular its thickness, that allows to enhance the wavelength shift of the applied FBG sensors
FBGs in 3D printed objects monitoring
No full textIn this work, the embedding of fiber Bragg gratings (FBGs) in 3D printed patches is proposed with the multiple aims to demonstrate the capabilities of the FBGs to monitor the deformation state and the temperature of the sensorized devices and to show the possibility to use this approach in the realization of robust and efficient packages for fiber optical sensors. FBGs are embedded in the monitored structure, avoiding the complex wiring typical of strain gauges, and provide local strain measurements in real-time. The possible application of the patch as sensing device is investigated showing that the thickness of the substrate, influencing the neutral axis position, acts as gaining factor on the deformation sensitivity of the FBG, while the temperature sensitivity in more than ten time greater than the bare FGB one thanks to the high thermal expansion of the plastic material of which the patches are made. Such results enable the application the 3D-printed patches as packages for FBGs in the deformation and temperature monitoring
Fiber Bragg gratings embedded in 3D-printed patches for sensitivity enhancement of deformation monitoring
No full textIn this work, we present and discuss on the sensing properties of a 3D printed patch embedding a fiber Bragg grating (FBG). In the paper, we first describe the fabrication process of the proposed sensing device and then we analyze its performance in terms of thermal sensitivity and deformation detection capability. In particular, FBGs were embedded in polylactic acid (PLA) rectangular patches that confer greater strength to the bare FBG and enhance their sensing capabilities. We show that the patch thickness, by increasing the distance between the optical sensor and the neutral axis of the structure where it is fixed, provides a gain factor in the device sensitivity to deformation. These results encourage the application of FBGs embedded in 3D-printed patches in the field of the structural monitoring where, by efficiently selecting patch dimensions, in particular the thickness, it is possible to improve the sensor robustness and, contemporary, the deformation sensitivity with respect to bare FBGs
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