Protective door monitoring system and method with distributed sensing optical fibers arranged in parallel

Abstract

The invention discloses a protective door monitoring system with distributed sensing optical fibers arranged in parallel. The system comprises transmission optical fibers (5), optical fiber sensors, alight source (101) for continuous emission of optical signals of different frequencies, wavelength division multiplexers (6), an optical circulator (102), a photoelectric detector (103) and a data processor (3), the frequencies for receiving the optical signals by the optical fiber sensors on protective doors at different positions are different, a plurality of wavelength division multiplexers (6) and the optical circulator (102) form an optical loop, each wavelength division multiplexer (6) corresponds to one protection door, end portions of the optical fiber sensors arranged on the protective doors are connected, and the optical fiber sensors on a plurality of protective doors are arranged in parallel in the optical loop. The invention also discloses a protective door monitoring methodwith the distributed sensing optical fibers arranged in parallel. According to the system and the method, monitoring early warning of the plurality of protective doors can be simultaneously realized,and mutual interference is avoided.

Description

technical field [0001] The invention belongs to the technical field of protective door monitoring, and more specifically relates to a protective door monitoring system and method in which distributed sensing optical fibers are arranged side by side. Background technique [0002] A cavern is set up in the railway tunnel, and a protective door is set up in the cavern as a fire separation measure to separate the cross passage, evacuation passage and the vehicle tunnel. The protective door of the railway tunnel is set next to the track. The entire facade of the protective door has been subjected to repeated and high-intensity piston wind for a long time, and there is a risk of damage or even falling off at any time. The protective door falling to the side of the road and its serious danger may lead to operational safety accidents . Therefore, by monitoring the vibration and deformation of the protective door under the action of the piston wind, the possible hidden dangers of th...

AI Technical Summary

Problems solved by technology

This patent mainly arranges the optical fiber on the surface of the door body to judge the falling off of the protective door along with the falling off of the door body. The defect is that it can only be detected after the falling off, and the falling off situation cannot be prefabricated in advance to deal with it in time, which may cause Security incidents due to processing delays

Images