Temperature sensing optical cable and its preparation method

Abstract

The invention discloses a temperature sensing optical cable and a preparation method thereof, wherein the temperature sensing optical cable and the preparation method relate to the field of optical communication cables. The temperature sensing cable comprises a cable core, a spiral protective layer and an oversheath, wherein the cable core, the spiral protective layer and the oversheath are successively arranged from inside to outside. The cable core comprises a tight buffer fiber. The cable core further comprises a shape memory alloy wire which is made of a shape memory alloy with a two-way memory effect. The shape memory alloy wire and the tight buffer fiber are arranged in an axial direction and are fixed together. The temperature sensing optical cable can accurately position fault points and furthermore can be recycled. The temperature sensing optical cable has advantages of long service life, high fault response speed, short alarm time, long sensing line length, small dimension and high mechanical performance. Furthermore the temperature sensing optical cable can be widely used in power plant, tunnel, mine and petrochemical project.

Description

technical field [0001] The invention relates to the field of optical communication cables, in particular to a temperature sensing optical cable and a preparation method thereof. Background technique [0002] Optical fiber sensing technology is emerging along with the development of optical fiber communication technology. It is a new type of sensing technology that uses light waves as the carrier and optical fiber as the medium to perceive and transmit external measured signals. Optical fiber sensing technology can realize the extraction of distributed information in a large-scale measurement field, solve many problems in the current measurement field, and is widely used in power plants, large warehouses, oil depots, high-rise buildings, mines and tunnels. Fire protection and temperature alarm systems and other fields . [0003] With the development of optical fiber sensing technology, a large number of temperature sensing optical cables are laid and deployed in engineering....

AI Technical Summary

Problems solved by technology

[0004] (1) The existing temperature sensing optical cable is difficult to accurately locate the fault point, and it is necessary to search repeatedly in the area near the fault alarm

[0005] (2) The existing temperature sensing optical cable has a short service life. With the extension of the use time, signal drift, sensitivity decrease, and serious sensor failure will gradually occur, resulting in the loss of sensing function of the optical cable

[0006] (3) Most of the existing temperature sensing optical cables are disposable products. After a fault occurs, the optical cable at the fault point is damaged, and the optical cable needs to be replaced

In engineering, the sensing optical cable is generally laid close to the engineering line, and it is very difficult to replace the optical cable.

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