Simple and rapid anchoring method and apparatus of distributive sensing optical cable

Abstract

The invention discloses a simple and rapid anchoring method and apparatus of a distributive sensing optical cable. A large cylinder is nested in a flange, and hollow circular truncated cones are fixed at two ends of the large cylinder; a spring is arranged in the large cylinder, metal clamping pieces are fixed at two ends of the spring, the other end of each metal clamping piece is connected with a small cylinder, and the flange, the large cylinder, the spring, the metal clamping pieces and the small cylinder are coaxial; and a loose-sleeve distributive sensing optical cable passes through a circular hole on the peripheral edge of the flange to play an effect of temperature compensation and alignment. According to the optical cable anchoring apparatus, the elastic force is controlled by virtue of a stiffness coefficient of the spring, the stress on a cross section of the loose-sleeve distributive sensing optical cable is uniformly distributed, and the optical cable is firmly installed; and moreover, the simple and rapid anchoring apparatus is small in size, simple in production, easy to operate, rapid to install, low in cost, small in micro-bend loss of an optical path, reliable in anchoring effect, suitable for the distributive sensing cables of different sizes, structures and cladding materials, and can firmly fix the distributive sensing optical cable on concrete, inside a rock and earth mass or on the surfaces of steel structures and concrete structures.

Description

technical field [0001] The invention relates to the field of optical fiber monitoring and laying technology, in particular to a simple and fast anchoring method and device for a distributed sensing optical cable. Background technique [0002] As a new type of sensing technology, optical fiber sensing technology has developed rapidly in recent decades, with high sensitivity, small size, strong anti-interference, good insulation, corrosion resistance, high cost performance, long monitoring distance, easy integration, etc. advantage. Among them, Brillouin Optical Time Domain Reflectometry (BOTDR), Brillouin Optical Time Domain Analysis (BOTDA), Brillouin Optical Frequency Domain Analysis (BOFDA) and other distributed optical fiber sensing technologies will "transmit" and "sense "Integrated two into one, it can measure parameters such as strain and temperature at all positions along the optical fiber and optical cable. , Geological disaster monitoring and early warning has gre...

AI Technical Summary

Problems solved by technology

The method of glue fixing is relatively complicated to operate, and it needs to wait for the glue to solidify during implementation, which affects the construction progress and has great limitations in terms of poor installation standardization, time-consuming construction, and aesthetics; on the other hand, in long-term monitoring During the process, the performance of the glue is affected by environmental factors such as temperature, humidity, and air dust. There are many shortcomings such as unreliable fixation, poor coupling of deformation, poor durability, and easy aging and falling off.

[0005] Simple physical anchoring generally uses iron wire binding, or screws, nuts, and rigid clips to fix, etc. The former has the disadvantages of simple anchoring methods and easy slippage of optical cables, while the latter has many construction steps, and the special clip structure is complex and expensive. Disadvantages such as controlling the size of the clamping force

Another important problem is that simple physical anchoring can neither fully meet the anchoring strength requirements, but also cause potential physical damage to the optical cable structure, and large microbending losses are prone to occur on the optical path, reducing the accuracy of optical fiber monitoring data. , in severe cases, monitoring readings cannot be obtained

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