1,720,992 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
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
Il significato dei rischi fisici nelle concerie: esperienza in tre concerie artigiane del polo artigiano di Solofra
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El significado del trabajo como presupuesto para la valoracion de la adaptacion de los trabajadores a traves de lo ejemplo des la fundiciones artesanales de bronce
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El significado del trabajo como presupuesto para la valoracion de la adaptacion de los trabajadores a traves de lo ejemplo des la fundiciones artesanales de bronce
No full textIl significato dei rischi fisici nelle concerie: esperienza in tre concerie artigiane del polo artigiano di Solofra
No full text3D shape sensing with FBG-based patch: from the idea to the device
No full textIn this work, the advantages of 3D printing technology are combined with fiber Bragg grating (FBG) sensors to implement an innovative 3D shape sensor embedded in a 3D printed patch. The system allows to obtain a sensing patch able to provide a direct measure of curvature and neutral axis position in the 3D space in a simple manner and without requiring numerical simulations or mathematical models of the structure of interest. The experimental tests assess the proposed novel approach showing an optimal agreement between the measurements of the proposed patch with respect to the reference sensors. Furthermore, both the curvature sensitivity and resolution can be modulated by changing the distances among the FBGs inside the patch, tailoring the performances and the dimensions with the application requirements
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