Armored sensing optical cable

Abstract

The invention discloses an armored sensing optical cable, which comprises a tightly packaged fiber, a metal hose, a metal mesh grid and an outer jacket layer, wherein the tightly packaged fiber is wrapped by the metal hose; the metal mesh grid is coated out of the tightly packaged fiber; the outer jacket layer is coated on the metal mesh grid; when one tightly packaged fiber is provided, a laeyr of Kevlar is arranged between the metal hose and the metal mesh grid; when multiple tightly packaged fibers are provided, a layer of Kevlar and a flameproof inner jacket are arranged between the metal hose and the tightly packaged fiber in sequence. The armored sensing optical cable is armored by the small metal hose, the minimum outer diameter is only 0.9 mm after armored, and the minimum outer diameter of the optical cable is only 1.8 mm after the optical cable is formed. The interval between the tightly packaged fiber of the armored sensing optical cable and the external environment is small, the temperature measuring speed of the armored optical cable is quicker than that of the common optical cable, and the temperature measuring precision is accurate. The problems of complicated structure of a common outdoor optical cable structure, isolation of the optical fiber and the external environment and poor temperature measuring effect are solved.

Description

technical field [0001] The invention relates to an optical fiber temperature measurement system element, in particular to an armored sensing optical cable for temperature sensing with optical fiber as the main body, belonging to the technical field of optical elements, systems or instruments. Background technique [0002] Optical fiber sensing technology is a product of modern communication and a brand-new technology gradually developed with the development of optical fiber and communication technology. During the transmission of light, it is affected by the external environment, such as temperature, pressure, etc., resulting in changes in the intensity, phase, frequency, polarization state and other light waves of the transmitted light. The corresponding physical quantities can be obtained by monitoring changes in these quantities. [0003] Compared with various traditional electrical sensors, fiber optic sensors have a series of advantages: high sensitivity, corrosion res...

AI Technical Summary

Problems solved by technology

When the ordinary optical cable is used in these outdoor environments, if it is squeezed, pulled and other external forces, the loss of the fiber may be too large, which will affect the accuracy of the sensing system, or even break the fiber.

Therefore, ordinary indoor optical cables are not suitable as sensing optical cables for outdoor sensing in subways, tunnels, dams, bridges, etc.

While ordinary outdoor optical cables (such as figure 2 ), its structure is complex, the outer diameter is larger, the weight is heavier, and the construction and laying is very inconvenient

The most important thing is that due to the structural characteristics of the outdoor optical cable, the outer layer of the optical fiber has a complex structure, which causes the optical fiber to respond slowly to the temperature of the outside world, and there may even be a large difference between the temperature measurement result of the optical fiber and the actual temperature, which affects the test effect.

Therefore, although ordinary outdoor optical cables have good tensile and compressive properties, their structural characteristics make them unable to meet the temperature measurement accuracy requirements.

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