A steel cable includes steel wires and at least one light wave guide which is surrounded by the steel wires and provided for detecting load-dependent cable strains, and has a glass fiber surrounded by a plastic casing. At least the steel wires closest to the light wave guide are crimped with the light wave guide and permanently pressed against the casing surface thereof, whereby the cross-sectional shape of the casing surface of the light wave guide deviates from an unloaded shape, in particular a circular shape, and the light wave guide is clamped continuously along at least one part of the longitudinal extension thereof, in a slip-free manner between the steel wires closest to same. A method produces a steel cable of this type.

A steel cable includes steel wires and at least one light wave guide which is surrounded by the steel wires and provided for detecting load-dependent cable strains, and has a glass fiber surrounded by a plastic casing. At least the steel wires closest to the light wave guide are crimped with the light wave guide and permanently pressed against the casing surface thereof, whereby the cross-sectional shape of the casing surface of the light wave guide deviates from an unloaded shape, in particular a circular shape, and the light wave guide is clamped continuously along at least one part of the longitudinal extension thereof, in a slip-free manner between the steel wires closest to same. A method produces a steel cable of this type.

A supporting belt for an elevator installation has at least one elongate load-bearing element, a casing surrounding the load-bearing element and multiple sensors. The sensors are arranged on the belt at multiple positions spaced apart from one another along a longitudinal direction of the belt. The sensors each determine at least one physical characteristic of the load-bearing element in a region locally adjacent to the respective sensor and output a signal indicating the physical characteristic. For example, a sensor may determine a local expansion, a local bending, a local acceleration, a locally acting force, a local temperature and/or an electrical conductivity at, in or through the belt. The state of the belt can thereby be determined not only as an average for the entire belt but with regard to multiple positions along the length of the belt, enabling an improved determination regarding discard criteria of the belt.

The invention relates to a method for determining the replacement state of wear of a rope made of a textile fibre material, wherein, in the course of using the rope, the elongation of the rope is monitored over its entire length and the rope is discarded if the elongation of the rope over the entire length exceeds a predetermined maximum value (%). The method according to the invention is characterized in that also the local elongation of a discrete rope section is monitored and the rope is discarded if the local elongation of the rope section exceeds a predetermined maximum value (%), with the maximum value of the local elongation of the rope section being greater than the maximum value of the elongation of the rope over the entire length.

A coated PC steel stranded cable includes: a stranded cable in which a plurality of elemental wires each composed of steel are twisted together; an anti-corrosive coating having an outer circumferential portion that coats an outer circumference of the stranded cable; an outer coating that coats an outer circumference of the anti-corrosive coating; and an optical fiber provided at a position inwardly of an outer circumferential surface of the outer coating and corresponding to a strand groove in the stranded cable so as to follow expansion and contraction of the stranded cable.

The invention relates to a method for monitoring condition of a rope of a hoisting device, which rope comprises one or more load bearing members oriented to extend parallel with longitudinal direction of the rope throughout the length thereof. The method comprises measuring strains of one or more portions of a load bearing member of the rope; and comparing the measured strains of one or more portions of a load bearing member of the rope with at least one reference. The invention also relates to a hoisting device implementing the method.

A cable (10) includes a cable body (11) that is formed from a plurality of wires (14) that are integrally bundled; and a pair of sockets (12) to which both end portions of the cable body (11) is separately affixed; at least one of the plurality of wires (14) being a fiber-containing wire (16), which is formed by an optical fiber (17) that extends in a cable length direction (D) and that is protected by a protective tube (18); wherein the optical fiber (17) protrudes from the protective tube (18), in the cable length direction, further outside than the socket (12); and each of the pair of sockets (12) is provided with a spool (30) that removably holds the optical fiber (17) and imparts an initial tensile strain to the optical fiber (17).

Disclosed is a non-steel high strength data transmission cable having a strength member (5) and a core (1). The high strength data transmission cable includes a length of a core-cable (10), the length of core-cable (10) includes core (1) plus at least one fiber-optic conductor (2) that is: (i) disposed in a helical shape; and (ii) completely encased in a solid, flexible material. Also disclosed is a process for making a high strength data transmission cable. The high strength data transmission cable is capable of being wound on a winch under tensions and surging shocks experienced by a fishing trawler, and provides high quality data signal transmission and resolution so as to permit use for transmitting data during fish trawl operation from high-resolution sonars used to monitor fish caught.

Disclosed is a non-steel strength membered high strength cable easily monitored for heat and elongation comprising a length of a core-cable (10), the length of core-cable (10) including at least two fiber-optic conductors (2) that are: (i) disposed in a helical shape; and (ii) completely encased in a solid, flexible material.
One fiber-optic conductor capable of transmitting at least Raman backscattering and the other fiber-optic conductor capable of transmitting at least Brillouin scattering. A combination of the cable (10): (i) with an interrogator that can read and interpret Raman backscattering coupled to and communicating with the fiber optic conductor that is capable of transmitting at least Raman backscattering; and (ii) another interrogator that can read and interpret Brillouin scattering coupled to and communicating with the fiber optic conductor that is capable of transmitting at least Brillouin scattering;
permits ascertaining the elongation of the cable, without using loose tube fiber-opticplacement.