Long-gauge fiber grating scour sensor, manufacturing method thereof, and installation and laying method thereof, and scour monitoring system formed by long-gauge fiber grating scour sensors

Abstract

The invention discloses a long-gauge fiber grating scour sensor, a manufacturing method thereof, and an installation and laying method thereof, and a scour monitoring system formed by the long-gauge fiber grating scour sensors. The long-gauge fiber grating scour sensor comprises an elastic straight rod and a long-gauge fiber grating sensing probe array that is integratedly packaged with the elastic straight rod; and the long-gauge fiber grating sensing probe array is at one side of the elastic straight rod. Besides, the long-gauge fiber grating sensing probe array includes a plurality of long-gauge fiber grating sensing probes that are successively in series connection. According to the invention, the scour principle is simple and reliable and the testing method is novel and ingenious; the manufacturing process of the sensor is simple and costs are relatively low; the sensor has good durability and good environment adaptability; testing precision is good and can reach 0.05m or even smaller, and the precision can be changed according to a concrete requirement; and there is no need to consider a temperature compensation problem, so that the test becomes simple and effective.

Description

technical field [0001] The invention relates to a monitoring device and method for civil engineering and traffic engineering, in particular to a long-gauge optical fiber grating scour sensor, its manufacturing, installation and layout method, and a scour monitoring system composed of the scour sensor. Background technique [0002] In projects such as water conservancy, water intake and drainage, sea and river bank dam protection, bridges, and offshore platforms, it is quite common for structures to be damaged by the erosion of water flow. The strength of the foundation of the structure is often reduced due to the erosion of the water flow, which brings hidden dangers to the safety of the structure, and because the erosion of the water flow is underwater, it is generally difficult to find it in time. However, once the structure is damaged due to scouring, it often leads to vicious accidents such as collapse, endangering the property and life safety of the broad masses of the ...

AI Technical Summary

Problems solved by technology

However, this kind of sensor has complicated process and high cost, but the accuracy can only reach 0.2m, and its metal shell and metal mesh are easy to rust in water, and its corrosion resistance is poor. In addition, each sensing probe on the sensor All the optical fiber lead-out lines need to be led out, which increases the occupation of the modem interface, which is not conducive to the simultaneous detection and monitoring of multiple sensors, and its installation position must also be upstream of the structural foundation, and there are certain limitations on the position

The scour sensor designed by Dalian University of Technology is also based on the traditional point sensing method for strain measurement. At present, there are no relevant patents and related literatures for the use of long-gauge fiber gratings for distributed sensing to study scour problems at home and abroad.

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