A reinforcing sleeve is a member for collectively reinforcing spliced portions of a plurality of optical fiber core wires disposed side by side. The reinforcing sleeve includes a heat-shrinkable tube, a heat-meltable member, a tension member, and so on. The heat shrinkable tube is a cylindrical member having an approximately circular cross section. The tension member and the heat-meltable member are inserted into the heat-shrinkable tube. The heat-meltable member is disposed on an upper part of the tension member. Also, an optical fiber dispersion portion is formed on a surface of the tension member on a side of the heat-meltable member in a cross section perpendicular to a longitudinal direction of the reinforcing sleeve. The optical fiber dispersion portion includes an inclined portion that is formed so as to separate away from the heat-meltable member as being closer to an end portion of a width direction in a cross section perpendicular to the longitudinal direction of the tension member.

Sensors for imaging boreholes via the detection of electrical and optical properties may be subject to harsh conditions downhole, such as from pressure and temperature. In addition, these sensors may be subject to impact, such as tension, elongation, and compression forces, along the wall of the borehole. The harsh conditions downhole and impacts on the sensor can lead to premature wear and even breaking. The present disclosure generally relates to an apparatus for measuring electrical and optical properties of the borehole and methods for manufacturing the apparatus.

A reinforcing sleeve is a member for collectively reinforcing spliced portions of a plurality of optical fiber core wires disposed side by side. The reinforcing sleeve includes a heat-shrinkable tube, a heat-meltable member, a tension member, and so on. The heat shrinkable tube is a cylindrical member having an approximately circular cross section. The tension member and the heat-meltable member are inserted into the heat-shrinkable tube. The heat-meltable member is disposed on an upper part of the tension member. Also, an optical fiber dispersion portion is formed on a surface of the tension member on a side of the heat-meltable member in a cross section perpendicular to a longitudinal direction of the reinforcing sleeve. The optical fiber dispersion portion includes an inclined portion that is formed so as to separate away from the heat-meltable member as being closer to an end portion of a width direction in a cross section perpendicular to the longitudinal direction of the tension member.

A slot type optical cable includes: an optical fiber; a slot rod that includes a plurality of ribs forming a groove in which the optical fiber is accommodatable; and a cable jacket that is provided around the slot rod. The cable jacket includes a sheath portion that is formed around the slot rod at substantially the same thickness by linearly connecting outermost peripheral edges of adjacent ribs.

A fiber optic cable includes an outer surface, an axial groove and an additional annular groove. The outer surface includes an annular groove. The axial groove that extends in an axial direction of the fiber optic cable. The additional annular groove is configured to separates sections of the outer surface. The axial groove is configured to be gripped by a connector to prevent rotation of the fiber optic cable relative to the connector. The separate sections are configured to hinge against each other such that the fiber optic cable is bendable to a predetermined bend radius.

A fiber optic cable assembly includes a fiber optic cable and a fiber optic connector. The fiber optic cable has an outer surface that includes a plurality of annular grooves spaced apart from one another in an axial direction of the fiber optic cable, and a plurality of axial grooves that extend in the axial direction. The plurality of axial grooves being spaced apart from one another in a circumferential direction of the fiber optic cable, the plurality of axial grooves are configured to divide the outer surface in a circumferential direction of the linear member into separate section, the separate sections are configured to hinge against each other such that the linear member is bendable to a predetermined bend radius, the fiber optic connector includes an axial ridge configured to be received by one of the plurality of axial grooves, and cooperative engagement between the axial ridge of the fiber optic connector and the one of the plurality of axial grooves of the fiber optic cable prevents rotation of the fiber optic cable relative to the fiber optic connector.

This optical fiber alignment jig for aligning a plurality of optical fibers with the tip end coating stripped off to expose glass fiber includes a rail; a convex push-up part capable of moving in the extending direction of the rail; and a plurality of plate-shaped parts that each have a first surface and a second surface perpendicular to the extending direction of the rail and an inclined surface that can carry a respective optical fiber, the inclined surfaces of the plurality of plate-shaped parts being inclined, relative to the extending direction of the rail, in the same direction. The plurality of plate-shaped parts are arranged side by side along the extending direction of the rail with the first surface of one plate-shaped part facing the second surface of an adjacent plate-shaped part and are contacted by the push-up part so as to move toward the inclined surface side.

This optical fiber alignment jig for aligning a plurality of optical fibers with the tip end coating stripped off to expose glass fiber includes a rail; a convex push-up part capable of moving in the extending direction of the rail; and a plurality of plate-shaped parts that each have a first surface and a second surface perpendicular to the extending direction of the rail and an inclined surface that can carry a respective optical fiber, the inclined surfaces of the plurality of plate-shaped parts being inclined, relative to the extending direction of the rail, in the same direction. The plurality of plate-shaped parts are arranged side by side along the extending direction of the rail with the first surface of one plate-shaped part facing the second surface of an adjacent plate-shaped part and are contacted by the push-up part so as to move toward the inclined surface side.

A deployable fiber optic cable for pairing with a connector, the cable including a plurality of partially bonded ribbon fibers each being sized and configured to be rolled into a circular cross section; an elongate member forming a slotted core including a plurality of rounded slots for longitudinally surrounding the circular cross sections of a corresponding plurality of the plurality of partially bonded ribbon fibers; a plurality of rugged fiber tubes each located adjacent a corresponding one of the plurality of slots and wherein each of the plurality of rugged fiber tubes longitudinally surround a corresponding plurality of the plurality of partially bonded ribbon fibers; a plurality of water-blocking yarn members each surrounding a corresponding one of the plurality of rugged fiber tubes; a rugged outer jacket; and a yarn strength member located between the rugged outer jacket and the slotted core.

Sensors for imaging boreholes via the detection of electrical and optical properties may be subject to harsh conditions downhole, such as from pressure and temperature. In addition, these sensors may be subject to impact, such as tension, elongation, and compression forces, along the wall of the borehole. The harsh conditions downhole and impacts on the sensor can lead to premature wear and even breaking. The present disclosure generally relates to an apparatus for measuring electrical and optical properties of the borehole and methods for manufacturing the apparatus.