1,721,141 research outputs found
A device and a system for measuring forces
No full textOptical transducers are provided according to the present invention for detecting forces such as, for example rotational and transversal forces acting on them, wherein, for the purpose of detecting said forces, optical signals (4a, 4b) are transmitted through an optical path defined by optical fibers (2a, 2b). Moreover, optical means (3) are provided, adapted to modify the transmission of the optical signals through the optical path, as a result of forces acting on them. The resulting optical signals exiting the transducer are then used for the purpose of detecting the forces acting on the transducer
Ethernet transmissions over large core polymer optical fibres: demonstration of an extended reach (425 m) LAN system
Full text linkOptical displacement transducer, displacement measurement system and method for displacement detection therefrom
Full text linkAn optical displacement transducer includes a transducing element (10) comprising at least a first (11; 51; 71) optical fiber, having a first end face (13) substantially aligned along an axis (15; 55; 75) and positioned with a small gap (16; 56; 76) between said first end face (13) and a second end face (14; 61) of a reception assembly (e.g. a second optical fiber) (12,14; 61,62,52; 61,63,72), the transducer (20) further comprising at least a light source (21) coupled for transmission to the first optical fiber (11) and at least a photo-detector (22) coupled for reception to the second optical fiber (12). The first end face (13) and second end face (14; 61) are displaceable along the axis (15; 55; 75) and relatively with respect to each other, in order to follow the displacement (d) of points associated to the first end fac The transducer is effective in detecting axial displacement simply and at low cost
WAVE PROPAGATION IN MULTILAYER STRUCTURES AND ADVANCED STRUCTURAL THEORIES
No full textThe dynamic behaviour of laminated structures with imperfect interfaces is studied by considering the propagation of harmonic waves. Interfaces are assumed to allow for relative motion in both the tangential and normal directions. New models are developed for studying basic cases and the fundamentals of the problem, a new and efficient zigzag theory is used to analyse laminates with an arbitrary number of layers. This work is applicable to laminated composite structures, sandwich structures, laminated glass and other laminated structures. The work points out the challenges associated with modelling laminates with imperfect bonding and the limitations of several existing theories, particularly for dynamic problems
A system and a method for measuring distances, displacements and mechanical actions
No full textAccording to the present invention there is provided an optical transducer adapted to detect external mechanical actions acting on said transducer, said transducer comprising at least one sensing optical path (5) adapted to transmit at least one sensing optical signal (b') and to emit at least one sensing output electrical signal (d) along with at least one reference path (4) adapted to emit at least one output electrical reference signal (e). Moreover, at least one portion (5') of said at least one optical path (5) is adapted to be exposed to external mechanical actions, so that the transmission of said sensing optical signal (b') through said sensing optical path can be modified as a result of said mechanical actions, so that a phase shift between said sensing electrical signal (d) and said reference electrical signal (e) is generated.; Furthermore, said at least one reference path (4) comprises phase shifting means (11) adapted to maintain the phase shift between said at least one output sensing electrical signal (d) and said at least one output reference electrical signal (e) at a constant value in absence of any mechanical action exerted on said at least one sensing optical path (5), resulting in the working point of the transducer being kept within a range centered o a predefined phase shift, thus allowing to improve the sensitivity pf the transduce
Fabrication and characterization of low-cost polarimetric fiber-optic pressure sensor
No full textPolarimetric optical fiber sensors exploit the variation in the polarization state of light transmitted from a single-mode fiber with external factor, such as pressure, temperature, etc. to estimate these physical quantities. In this paper we present the principles, fabrication and operation of a low-cost polarimetric pressure sensor that is based on the coupling between the two orthogonally polarized fundamental modes in a standard telecommunication fiber
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