Distributed optical fibre deformation detecting pipe and testing method thereof

Abstract

The invention relates to a distributed optical fiber distortion detection tube and detection method thereof, which has a main cylinder with two ends being respectively connected to one port of two auxiliary cylinders via step joints to form a tube chamber, the tube chamber having an inner chamber equipped with optical fiber unit channels composed of fixing clips, a mass block, and step joints, aswell as reserved optical fiber volumes. When being used for detection, the free end of the tube chamber is placed into a target medium, the fixed end of the tube chamber is connected to a distributedoptical fiber sensing analyzer, and as a result, deformation of the medium causes downward inclination or upwarping of the free end of the tube chamber, the mass block in the tube chamber slides toward the end of the tube, the optical fiber in the lower or upper optical fiber channel is stretched, and the signal is detected by the distributed optical fiber sensing analyzer. The technical scheme overcomes attenuation of actual strain of optical fibers due to surface adhesion to their carriers, as well as defects of damage or even break due to being uncoveredly laid on the outer surface of inclination survey tube, thus is applicable to constrained distortion, long-term monitoring, safety control, and professional maintenance of various engineering such as dams, slopes, pit foundations, piles, and cofferdams.

Description

technical field [0001] The invention relates to a detection device and a detection method thereof, in particular to a tube cavity in which two ends of a main cylinder are respectively connected to one port of two secondary cylinders through a stepped joint, and an optical fiber unit channel and a pre-set are arranged in the cavity. A distributed optical fiber deformation detection tube and a detection method for detecting the force deformation of dams, foundations, etc. through the free end of the tube cavity and the deformation of the medium, leaving the optical fiber coil. Background technique [0002] The existing earth-rock dams used for flood control and spur dams used for river regulation have the disadvantage that the structure of the dam itself is loose, and when the flood comes, it is easy to be washed away and collapse, which poses a major threat to the lives and property safety of nearby residents. Therefore, real-time monitoring of the deformation of dams is of g...

AI Technical Summary

Problems solved by technology

The disadvantage of this technical solution is that the sensing optical fiber is laid on the outer surface of the inclinometer tube in a fully pasted manner, which will attenuate the actual deformation due to the thickness of the inclinometer tube, and the sensitivity of the system is affected by the bonding of the optical fiber, measuring The thickness and material of the inclined pipe have a great influence, and the bare sensing optical fiber is directly laid on the outer surface of the inclinometer pipe, which is easily broken by the extrusion of stones and sand in the soil, thus losing the information source and causing the paralysis of the entire system

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