Embedded type fiber bragg grating strain transducer for surface grooved-type road and manufacturing method for embedded type fiber bragg grating strain transducer

Abstract

The invention discloses an embedded type fiber bragg grating strain transducer for a surface grooved-type road and a manufacturing method for the embedded type fiber bragg grating strain transducer. The strain transducer is composed of a bare fiber and encapsulating materials, and is characterized in that a casing pipe is arranged outside the pigtail part of the bare fiber, an armor cable is arranged inside the casing pipe, a steel casing pipe is arranged outside the armor cable, the two ends of the steel casing pipe are provided with end expanding heads respectively, and the surface of the steel casing pipe is provided with a plurality of surface grooves. The strength of the strain transducer can meet the conditions of a long road engineering serving period, an adverse serving environment and the like; the surface grooves in the steel casing pipe and the end expanding heads can be used for enhancing the connecting force between the sensor and road face materials and improving the collaborative deformation capacities of the transducer and the road face, and therefore the measuring errors caused by modulus differences of the transducer and the road face are reduced.

Description

technical field [0001] The invention relates to the technical field of road intelligent monitoring, in particular to an optical fiber grating strain sensor for road surface strain monitoring encapsulated by a surface groove type steel sleeve, and also relates to a manufacturing method of the strain sensor. Background technique [0002] Due to its simple structure, good reliability, corrosion resistance, strong anti-electromagnetic interference ability, strong multiplexing ability, good stability, and high precision, the fiber grating sensor overcomes the traditional sensors that cannot adapt to the long service period of the road surface and the harsh service environment. And other shortcomings, has become a hot spot in engineering applications. However, it is a difficult point in road engineering to use fiber grating sensors to monitor the internal strain of pavement structure to evaluate the performance of pavement structure. This is due to the difference between the modu...

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Problems solved by technology

This is due to the difference between the modulus of the fiber grating sensor and the pavement material, resulting in poor co-deformation ability between the sensor and the road surface, resulting in a large difference between the information collected by the fiber grating sensor and the real information of the road surface, which cannot be directly used to evaluate the stress state of the point

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