Flexible protective net foreign matter intrusion monitoring device based on optical fiber grating sensor

Abstract

The invention discloses a flexible protective net foreign matter intrusion monitoring device based on an optical fiber grating sensor. The device comprises a flexible protective net, the optical fibergrating combined sensor for simultaneous measurement of deformation and vibration, and a plurality of fixing ribbons, wherein the optical fiber grating combined sensor for simultaneous measurement ofdeformation and vibration is fixed on a protective net cable through the ribbons; the optical fiber grating combined sensor adopts a cylindrical structure; a first optical fiber grating is fixedly adhered to the inner wall of the left side of the sensor and used for measuring impact bending deformation; and a second optical fiber grating with a suspended mass block is arranged on the inner wall of the right side of the sensor and used for measuring impact vibration. The optical fiber gratings in the device are firm and reliable to seal and easy and convenient to install; and the deformation and the vibration when the protective net is impacted are monitored at the same time, so that the accuracy is higher and monitoring information is more comprehensive.

Description

technical field [0001] The invention belongs to the technical field of civil engineering safety, and relates to an optical fiber sensing monitoring technology, in particular to an optical fiber grating monitoring device for preventing foreign objects from being invaded by a flexible protective net. Background technique [0002] my country is a large mountainous country. With the vigorous construction of infrastructure such as high-speed rail and highways, dangerous rockfalls in mountainous areas pose an increasingly serious threat to traffic safety along railways and highways. The flexible protective net is used to cover and intercept rockfalls, which can effectively prevent Falling rocks rolled onto railway tracks, highways. Although the protective net is installed and applied on the engineering site, if there are rolling stones overturning, breaking through the protective net, and then invading the road and railway, since the protective net itself has no monitoring and earl...

AI Technical Summary

Problems solved by technology

However, this patent only measures the deformation information of the decompression ring, which is not comprehensive enough, and it is easy to miss the impact information of falling rocks. For example, when the falling rocks overturn the top of the protective net and then rush into the track, the decompression ring may not be deformed due to the small impact

It can be seen that the existing fiber grating monitoring technology has certain defects, which is not conducive to accurate and comprehensive safety monitoring and early warning of protective nets.

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