High-sensitivity wide-range stress-strain sensing optical cable and its monitoring method

Abstract

The invention discloses a high-sensitivity wide-range stress-strain sensing optical cable for structure safety monitoring, and a monitoring method of the optical cable. The optical cable comprises an outer protection layer, a reinforcing member, a half-tight sleeve sensing unit and a loose sleeve sensing unit, wherein the reinforcing member adopts a twisted structure; and the reinforcing member, the half-tight sleeve sensing unit and the loose sleeve sensing unit are placed in parallel. According to the optical cable, the testing sensitivity of the half-tight sleeve sensing unit is improved by the reinforcing member in the twisted structure, and a range scope of the stress-strain sensing optical cable is expanded by regulating excessive length of the loose sleeve sensing unit and a testing scope of the half-tight sleeve sensing unit. The optical cable can be applied to various measuring occasions, has an extremely large measuring range and takes the measuring sensitivity into consideration, categories of the sensing optical cable are reduced, the cost is saved, and the laying difficulty is reduced.

Description

technical field [0001] The invention belongs to the technical field of signal detection and analysis, and relates to a high-sensitivity wide-range stress-strain sensing optical cable and a monitoring method thereof for structure safety monitoring. Background technique [0002] In recent years, in structural health monitoring and geological disaster monitoring, the optical fiber sensing monitoring system using Brillouin distributed optical fiber monitoring technology has been developed rapidly. At present, the manual data collection method based on conventional electrical measuring sensors is widely used in engineering However, this method has small monitoring range, heavy workload, low efficiency, and large investment, and cannot guarantee the long-term stability and accuracy of monitoring data. Optical fiber sensors have the characteristics of anti-electromagnetic interference, waterproof, corrosion resistance, long durability, wide measurement range, and easy laying and in...

AI Technical Summary

Problems solved by technology

[0003] At present, the traditional sensing optical cables are mainly divided into two categories. One is the sensing optical cable with tight sleeve structure, which is mainly used for stress and strain monitoring of regular objects. The disadvantage is that the monitoring range is small and it is easily affected by the environment; the second type is redundant. Structural sensing optical cables are mainly used for the monitoring of complex structures and complex environments. The disadvantage is that the monitoring sensitivity is low.

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