Arrangement method of a distributed optical fiber sensor

Abstract

A method for distributing distributed optical fiber sensors, which belongs to the technical field of road detection, to solve the problems of long construction period, difficult slotting, poor fixing effect of sensors and difficulty in guaranteeing backfilling effect existing in laying sensors on asphalt pavement . The present invention comprises the following steps: A, respectively installing fixed seats restricting axial movement at both ends of the existing distributed optical fiber sensor, and coating the surface of the distributed optical fiber sensor with thermoplastic colloid material; B, applying the existing road surface Carry out slotting and expand the notches at both ends of the slotted road surface to ensure that the fixing seat is smoothly installed into the groove of the road surface; The mixture is filled into the groove of the road surface, and the thermoplastic colloid material coated on the surface of the distributed optical fiber sensor is melted due to high temperature, so as to fill the gap around the distributed optical fiber sensor. The invention is applicable to the detection of asphalt pavement.

Description

technical field [0001] The invention relates to a method for arranging sensors on asphalt pavement, in particular to a method for arranging distributed optical fiber sensors, and belongs to the technical field of road detection. Background technique [0002] The intelligent sensing components used in asphalt pavement research are mainly point sensors and distributed optical fiber sensors. Distributed optical fiber sensors have gradually become a research hotspot in the industry because they can realize long-distance, full-section structural information monitoring and low cost. [0003] In terms of road soil foundation and slope monitoring, the optical fiber sensor is generally pasted on the surface of the measuring tube, embedded in the slot, and the deformation of the soil body is obtained by using the strain of the measuring tube. Different from sensors embedded in the soil, the deployment process of optical fiber sensors on asphalt pavement is more complicated. It is req...

AI Technical Summary

Problems solved by technology

First, the speed of asphalt surface paving is slow, and the increase in cross-section distance increases the waiting time before laying; secondly, the number of slots required for optical fiber laying is large and the size is long, and the cooling and hardening of local mixture is accelerated during the slotting process. increase; again, applying micro-prestress to long-distance optical fibers takes a long time to install; finally, long distances lead to increased time consumption for slotting and backfilling

In summary, the increase in the time consumption of each link leads to a longer deployment cycle

[0008] 2. Slotting is difficult

In the process of long-distance grooving, the surface layer cools and hardens with time, and the use of tools such as electric picks and iron picks increases the difficulty of grooving, and it is difficult to ensure the flatness of the groove

[0010] 3. The sensor fixation effect is not good

[0011] At present, clamping blocks or pressure heads and screws or screws are commonly used to fix the sensor, but in the process of paving the road, the sensor is prone to slipping and splitting under the action of the mixture; in order to improve the fixing effect, usually Use normal temperature glue to bond the sensor and clamping block or indenter. Although the fixing effect can be achieved, the curing time of the normal temperature glue is slow, which is inconvenient for on-site construction

[0012] 4. The effect of backfilling is difficult to guarantee

However, in actual operation, the width of the slot is similar to the diameter of the optical fiber. After installing the distributed optical fiber, it is difficult for the backfill to enter the bottom of the groove and leveling is difficult. bad

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