Remote optical fiber door cover switch monitoring system

Abstract

The invention relates to a remote optical fiber door cover switch monitoring system. The remote optical fiber door cover switch monitoring system includes an optical time domain reflectometer, a transmission optical fiber and switch sensing devices; one end of the transmission optical fiber is connected with the optical time domain reflectometer; the transmission optical fiber is provided with at least one switch sensing device; the switch sensing devices are correspondingly installed on door cover switches to be monitored; each switch sensing device structurally comprises an optical fiber ring, a spring, a spring protective frame, a mobile adjustment component and a limiting protection box; the optical fiber ring, the spring and the spring protective frame are all arranged in the protection box; one optical fiber is wound by a plurality of turns so as to form the optical fiber ring; one end of the mobile adjustment component is arranged in the limiting protection box, and the other end of the mobile adjustment component extends out from the top end of the limiting protection box; and two ends of the optical fiber ring extend out from the limiting protection box and are connected with the transmission optical fiber. The switch monitoring system of the invention has the advantages of simple structure and far detection distance, and is not subjected to electromagnetic interference and can detect a large number of door covers.

Description

technical field [0001] The invention relates to the field of OTDR application technology, in particular to a remote optical fiber door switch monitoring system utilizing OTDR technology. Background technique [0002] At present, the automatic monitoring of the switch status of public safety door covers has not attracted enough attention, resulting in frequent accidents, and the monitoring of door covers in some key areas is basically based on electrical switch monitoring, but the notification door cover is realized through electric switches. The switch status of the switch needs to provide power at the door cover (with power supply lines or batteries, or solar energy, etc.). This type of monitoring method has poor anti-electromagnetic interference ability, inconvenient power supply, and limited transmission of state quantities. [0003] The optical fiber remote multi-point switch state monitoring system proposed in CN1010871378A needs to connect a magneto-optical travel swit...

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Problems solved by technology

[0002] At present, the automatic monitoring of the switch status of public safety door covers has not attracted enough attention, resulting in frequent accidents, and the monitoring of door covers in some key areas is basically based on electrical switch monitoring, but the notification door cover is realized through electric switches. The switch status of the switch needs to provide power at the door cover (with power supply lines or batteries, or solar energy, etc.), this type of monitoring method has poor anti-electromagnetic interference ability, inconvenient power supply, and limited transmission of state quantities

[0003] The optical fiber remote multi-point switch status monitoring system proposed in CN1010871378A needs to connect a magneto-optical travel switch and an optical splitter in the optical link, which brings inconvenience to the design and construction. At the same time, the magneto-optical travel switch (CN2901346Y) requires the design and manufacture of optical devices , while the use of fiber grating technology to monitor the switch state is limited in transmission distance (generally less than 10km), and the number of serial connections of gratings is limited by the demodulation equipment, and the serial connection of sensors requires a large amount of engineering

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