摘要:
A fiber optic cable includes an optical fiber, a strength layer assembly disposed adjacent to the optical fiber and an outer jacket surrounding the strength layer assembly. The strength layer assembly includes a strength layer, an outer layer and an inner layer. The strength layer includes a binder and a plurality of reinforcing fibers embedded within the binder. The strength layer has a first surface and an oppositely disposed second surface. The outer layer is disposed adjacent to the first surface of the strength layer. The inner layer is disposed adjacent to the second surface of the strength layer.
摘要:
A fiber optic cable includes an optical fiber, a strength layer assembly disposed adjacent to the optical fiber and an outer jacket surrounding the strength layer assembly. The strength layer assembly includes a strength layer, an outer layer and an inner layer. The strength layer includes a binder and a plurality of reinforcing fibers embedded within the binder. The strength layer has a first surface and an oppositely disposed second surface. The outer layer is disposed adjacent to the first surface of the strength layer. The inner layer is disposed adjacent to the second surface of the strength layer.
摘要:
Das Überwachungssystem für den Schließzustand der Tür oder des Deckels eines Glasfaser-Netzverteilers, ist gekennzeichnet durch eine von dem Glasfaser-Netzverteiler räumlich getrennte zentrale Steuer-, Mess- und Überwachungseinheit, die Mittel zum Aussenden und Empfangen von rücklaufenden Lichtimpulsen und deren Auswertung aufweist, eine in dem Glasfaser-Netzverteiler angeordnete Dämpfungseinrichtung für zu der zentralen Steuer-, Mess- und Überwachungseinrichtung rücklaufende Lichtimpulse, und einen nicht für die Telekommunikation genutzten Glasfaser-Leiter, der mit der Steuer-, Mess-und Überwachungseinheit und der Dämpfungseinrichtung verbunden ist, wobei die Dämpfungseinrichtung eine Betätigungseinrichtung aufweist, die den Schließzustand der Tür oder des Deckels erfasst und bei geöffneter Tür/Deckel die Dämpfungseinrichtung in einen Zustand versetzt, in dem die durch den Glasfaser-Leiter rücklaufenden Lichtimpulse gedämpft werden.
摘要:
An optical fiber or electrical power cable with at least one electrochemical chemical analyte sensor which includes a conductive polymer which extends longitudinally along the length of the cable. The polymer has electrical properties which undergo a reversible change when in contact with a chemical analyte. The conductive polymer can be a conductive polymer composite including an immiscible polymer blend of at least two polymers and a conductive filler which is dispersed in one of the polymers of the blend through a multiple percolation process. The cable has a jacket and the sensor(s) are disposed outside the core in proximity to an inner or outer surface of the jacket, or as part of the jacket, and not energy coupled to any energy converging media in the cable, so that the presence of analytes in contact with the cable can be detected, the location along the longitudinal length of a cable where the cable is exposed to the analytes can be determined, penetration of the analytes into the cable occurs can be detected, whether damage has been caused to the cable by the analytes or otherwise can be determined and the identity of an analyte which is in contact with the cable can be determined.
摘要:
Bei einem Laserlichtkabel (1) ist eine einen Lichtwellenleiter (2) umgebende, in Längsrichtung des Laserlichtkabels elektrisch leitende Drahtumhüllung (5) durch Wicklung eines einzelnen Drahts (12) oder eines aus parallelen Drähten (14) bestehenden Drahtbandes (13) gebildet.
摘要:
The specification describes optical fibers that are constructed to prevent theft of optical signals. One construction is designed to block access of the core (61) of the fiber to the "writing" radiation necessary to form a grating tap. In this embodiment the optical fiber cladding (62-66) is provided with a highly absorbing UV layer (65). In a variation of this embodiment, one or more additional optical paths (68) are provided in the optical fiber to accommodate monitoring signals. The added optical paths (68) allow monitoring signals to be transmitted in the optical fiber, separate from the information signal, to signal an attempt to breach the outer coating or the cladding (62-66) of the optical fiber. A second case of intrusion is addressed by increasing the sensitivity of the optical fiber to microbending loss to the extent that bends in the fiber cause such high attenuation of the signal that the bends do not go undetected at the receiving station.
摘要:
Dispositif de scellement d'un conteneur et procédé de détection d'une tentative d'effraction à l'aide de ce dispositif. De manière connue, on masque une partie des fibres à une extrémité d'un câble à fibres optiques (22) et on observe l'autre extrémité du câble (22) lorsqu'on éclaire la première. Selon l'invention, les deux extrémités du câble (22) sont maintenues dans un corps de scellé (2) tandis que le masquage est obtenu à l'aide d'un faisceau énergétique (56) qui détruit l'extrémité de certaines fibres ; l'observation de la deuxième extrémité du câble (22) se fait soit à l'aide d'un appareil photographique, soit à l'aide d'une caméra de visée (74) permettant de repérer les coordonnées des fibres non éclairées (A₁, B₁, C₁). Application à la détection d'une tentative d'ouverture d'un conteneur.