CN201096929Y - Sensing optical cable - Google Patents

Abstract

The utility model discloses a sensing optical cable, aiming to provide an outdoor distributed sensing optical cable device with high sensitivity, high strength and high protection. It comprises a water-blocking optical fiber, an armor layer coated on the outside of the water-blocking optical fiber, and a flame-retardant outer sheath coated on the outside of the armor layer. The sensing optical cable also comprises a supporting skeleton arranged in the armor layer, and the armor layer is also tightly coated on the outer surface of the supporting skeleton; the supporting skeleton is provided with three grooves along the length direction, and the projections of the groove bottoms of the three grooves on the radial cross section of the optical cable are in the shape of circular arcs, and the centers of the three circular arcs are respectively distributed at the three vertices of an equilateral triangle; the water-blocking optical fiber has three groups, and the three groups of water-blocking optical fibers are respectively located in the three grooves of the supporting skeleton.

Description

Sensor cable

technical field

The utility model relates to an outdoor distributed sensing optical cable.

Background technique

As a new direction for the development of optical cables, sensing optical cables make full use of the advantages of light weight, thin diameter, strong resistance to electromagnetic interference, corrosion resistance, high temperature resistance, small signal attenuation, and integration of information sensing and transmission. The sensing optical cable must be able to adapt to the harsh outdoor environment, which requires the sensing optical cable to have high strength, good waterproof, flame retardant and other functions. In order to improve the strength of the sensing optical cable, the existing sensing optical cable adopts the method of covering the outer side of the optical fiber unit with a metal sleeve, but the bending stiffness of the metal pipe is relatively small over a long distance; in order to solve the problem of flame retardant and waterproof of the sensing optical cable , the existing sensing optical cable adopts the method of coating a layer of protective layer on the surface of the optical fiber unit, but the protection performance of the protective layer is poor, it is easy to be damaged during laying, and it is difficult to adapt to the use in harsh environments.

Contents of the invention

The utility model overcomes the deficiencies in the existing sensing optical cable technology and provides an outdoor distributed sensing optical cable with high sensitivity, high strength and high protection.

The utility model is realized in the following way: a sensing optical cable, comprising a water-blocking optical fiber, an armored layer coated on the outside of the water-blocking optical fiber, and a flame-retardant outer sheath coated on the outside of the armored layer , the sensing optical cable also includes a support frame arranged in the armor layer, and the armor layer is also tightly wrapped on the outer surface of the support frame; the support frame is along the length There are three grooves in the direction, the projection of the groove bottoms of the three grooves on the radial section of the optical cable is arc-shaped, and the centers corresponding to the three arcs are respectively distributed at the three vertices of the equilateral triangle There are three groups of water-blocking optical fibers, and the three groups of water-blocking optical fibers are respectively located in the three grooves of the supporting frame.

The core of the water-blocking optical fiber is a fiber core, the fiber core is covered with an adhesive tape, the adhesive tape is covered with a foam buffer water-blocking tape, and the foam buffer water-blocking tape The outside of the belt is covered with a water-blocking tape, the outside of the water-blocking tape is covered with an inner protective tape, and the outer protective tape is covered with an outer protective tape. Water-blocking yarns are arranged in the three grooves, and the water-blocking optical fibers are buried in the water-blocking yarns. A water-blocking layer is covered between the armor layer and the flame-retardant outer sheath.

Compared with the prior art, the utility model has the advantages of: three groups of water-blocking optical fibers in the sensing optical cable, using two of them for sensing and identification, and the third group as a reference, can detect the physical field conditions of all aspects of the optical cable , so that the sensing positioning is more accurate and the sensitivity is higher; the use of the supporting skeleton structure greatly improves the strength of the sensing optical cable; the water-blocking yarn, water-blocking layer, water-blocking tape, and foam buffer water-blocking tape play a good role in waterproofing As a result, the flame retardant outer sheath has a good flame retardant effect.

Description of drawings

Fig. 1 is a sectional view of the sensing optical cable;

Fig. 2 is an enlarged cross-sectional view of a water-blocking optical fiber.

Wherein, 1, support skeleton, 11, groove;

2. Water blocking optical fiber, 21, fiber core, 22, adhesive tape, 23, foam buffer water blocking tape, 24, water blocking tape, 25, inner protective tape, 26, outer protective tape;

3. Water-blocking yarn, 4. Armor layer, 5. Water-blocking layer, 6. Flame-retardant outer sheath.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail:

Referring to Fig. 1, a sensing optical cable includes a water-blocking optical fiber 2, an armor layer 4 coated on the outside of the water-blocking optical fiber 2, and a flame-retardant outer sheath coated on the outside of the armor layer 4 6; the sensing optical cable also includes a support frame 1 arranged in the armor layer 4, and the armor layer 4 is also tightly coated on the outer surface of the support frame 1; the The support frame 1 is provided with three grooves 11 along the length direction, the projection of the groove bottoms of the three grooves 11 on the radial section of the optical cable is arc-shaped, and the centers corresponding to the three arcs are respectively Distributed at the three vertices of the equilateral triangle; there are three groups of water-blocking optical fibers 2, and the three groups of water-blocking optical fibers 2 are respectively located in the three grooves 11 of the supporting frame 1.

The core of the water-blocking optical fiber 2 is a core 21, the core 21 is covered with an adhesive tape 22, the adhesive tape 22 is covered with a foam buffer water-blocking tape 23, the The foam buffer water blocking tape 23 is covered with a water blocking tape 24, the water blocking tape 24 is covered with an inner protective tape 25, and the inner protective tape 25 is covered with an outer protective tape 26. The foam buffer water blocking tape 23 includes a plurality of foam holes, the diameter of the foam holes is less than 20 μm, and the foam holes are closed respectively, and the foam buffer water blocking tape 23 plays the role of For water blocking and buffering of external pressure, the inner protective tape 25 is made of metal material, which can increase the strength of the water blocking optical fiber 2 .

The three groups of water-blocking optical fibers 2 in the sensing optical cable, using two of them for sensing and identification, and the third group as a reference, can detect the physical field conditions of various aspects of the optical cable, making the sensing and positioning more accurate; at the same time The three groups of water-blocking optical fibers 2 can also be used as communication optical cables, truly achieving sensor integration.

The three grooves 11 are all provided with a water-blocking yarn 3 , and the water-blocking optical fiber 2 is embedded in the water-blocking yarn 3 . The function of the water-blocking yarn 3 is to play a good water-blocking effect on the one hand, and to avoid the contact between the supporting frame 1 and the water-blocking optical fiber 2 on the other hand.

A water-blocking layer 5 is coated between the armor layer 4 and the flame-retardant outer sheath 6 to enhance the water-blocking effect of the sensing optical cable.

The flame-retardant outer sheath 6 is made of high-density polyethylene added with flame-retardant materials, which not only has a good fireproof function, but also improves the effective service life and stability of the optical cable.

Claims (4)

1. A sensing optical cable, comprising a water-blocking optical fiber (2), an armor layer (4) coated on the outside of the water-blocking optical fiber (2), and an armor layer (4) coated on the outside of the armor layer (4). The flame-retardant outer sheath (6) is characterized in that: the sensor optical cable also includes a support frame (1) arranged in the armor layer (4), and the armor layer (4) It is also tightly coated on the outer surface of the support frame (1); the support frame (1) is provided with three grooves (11) along the length direction, and the grooves of the three grooves (11) The projection of the bottom on the radial section of the optical cable is arc-shaped, and the centers corresponding to the three arcs are respectively distributed at the three vertices of the equilateral triangle; the water-blocking optical fiber (2) has three groups, the The three groups of water-blocking optical fibers (2) are respectively located in the three grooves (11) of the supporting frame (1). 2. The sensing optical cable according to claim 1, characterized in that: the core of the water-blocking optical fiber (2) is a core (21), and the core (21) is covered with an adhesive tape (22), the adhesive tape (22) is covered with a foam buffer water blocking tape (23), the foam buffer water blocking tape (23) is covered with a water blocking tape (24), The water blocking belt (24) is covered with an inner protective belt (25), and the inner protective belt (25) is covered with an outer protective belt (26). 3. The sensing optical cable according to claim 1, characterized in that: the three grooves (11) are provided with water-blocking yarns (3), and the water-blocking optical fibers (2) are embedded in the in the water-blocking yarn (3). 4. The sensing optical cable according to claim 1, characterized in that: a water-blocking layer (5) is covered between the armor layer (4) and the flame-retardant outer sheath (6).

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