Bidirectional long-gauge-length fiber grating strain sensor

Abstract

The invention discloses a bidirectional long-gauge-length fiber grating strain sensor. The bidirectional long-gauge-length fiber grating strain sensor comprises two measuring devices, wherein the two measuring devices are connected into a whole through an elbow and perpendicular to each other, each measuring device comprises a stress and deformation portion, a fiber grating sensor and a fiber grating adjusting instrument which is connected with the fiber grating sensor, each stress and deformation portion comprises two stainless steel disks and a stainless steel tube which is arranged between the stainless steel disks, the fiber grating sensors penetrate the stainless steel tubes, one ends of the fiber grating sensors are connected with the fiber grating adjusting instruments, the other ends of the fiber grating sensors are connected with each other through a connecting optical fiber which is arranged inside the elbow, and the fiber grating sensors are connected with inner walls of the stainless steel tubes through two bonding points. According to the bidirectional long-gauge-length fiber grating strain sensor, the two measuring devices are arranged, so that strain data in two directions can be read in one time, and sensors are prevented from being embedded repeatedly; and the stainless steel tubes are arranged, so that the sensors are fully protected, and the normal working of the sensors is prevented from being affected during foundation rolling compaction.

Description

technical field [0001] The invention relates to a device for real-time monitoring of expressways in pavement structures, in particular to a bidirectional long gauge optical fiber grating sensor, which belongs to stress and strain detection devices. Background technique [0002] In engineering practice, traditional resistance strain gauges have always played an important role in civil engineering testing, but in highway structures, traditional strain gauges can no longer meet the current measurement requirements. Since the measuring device needs to be buried in the foundation, it is easy to be damaged during the foundation rolling process. In monitoring, it is usually necessary to measure stress and strain in different directions, and embedding sensors one by one is time-consuming and laborious, resulting in unnecessary waste. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a bidirectional long gauge fiber gratin...

AI Technical Summary

Problems solved by technology

[0002] In engineering practice, traditional resistance strain gauges have always played an important role in civil engineering testing, but in highway structures, traditional strain gauges can no longer meet the current measurement requirements

Since the measuring device needs to be buried in the foundation, it is easy to be damaged during the foundation rolling process

In monitoring, it is usually necessary to measure stress and strain in different directions, and embedding sensors one by one is time-consuming and laborious, resulting in unnecessary waste

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