Access Control System

Abstract

Disclosed is a door control monitoring system, comprising a plurality of optical fibre sensors and an optical link detection system. The optical fibre sensors are respectively arranged at a position of the body of a case close to an edge of the door of the case. An optical fibre sensor comprises an optical fibre, a reflection module and a transmission structure. The reflection module is connected in series in the optical link detection system via the optical fibre. The transmission structure is elastically connected to the reflection module. The door of the case is closed such that the transmission structure is shifted by a force and pushes up the reflection module, so as to change the reflectivity of the reflection module. The door of the case is opened such that the transmission structure is returned back, and the reflectivity of the reflection module is restored. The optical link detection system senses the reflectivity of the reflection module, so as to monitor the opening and closing of the door of the case. The door control monitoring system of the present invention can effectively monitor various states of the door of a case, and cannot influence the service quality of a link.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to an access control monitoring system for an outdoor optical cable transfer box. Background technique [0002] The failure of the optical fiber box door to close normally has always been a potential hidden danger to the quality of the optical fiber. There are a lot of damage phenomena, construction personnel do not follow the norms, violent construction and unlocking the door are serious. The current electronic access control is difficult to use in passive scenarios where power supply is difficult, and the overall transformation cost is very high, making it difficult to apply to ODN scenarios. In the scheme of passive sensor using optical fiber, attenuating optical fiber sensor is used. The sensor uses different bending radii to the sensing optical fiber when the box door is opened and closed, resulting in different insertion loss values. On the one hand, it is diffic...

AI Technical Summary

Problems solved by technology

[0002] The failure of the optical fiber box door to close normally has always been a potential hidden danger to the quality of the optical fiber. There are a lot of damage phenomena, the construction personnel do not operate according to the specifications, violent construction and unlocking the door are serious.

The current electronic access control is difficult to use in passive scenarios where power supply is difficult, and the overall transformation cost is very high, making it difficult to apply to ODN scenarios

In the scheme of passive sensor using optical fiber, attenuating optical fiber sensor is used. The sensor uses different bending radii to the sensing optical fiber when the box door is opened and closed, resulting in different insertion loss values. On the one hand, it is difficult to ensure accurate insertion loss positioning. Faults in the link will also lead to changes in insertion loss. On the other hand, it will also affect the business. At the same time, it is easy to be limited by the dynamic range. This method has great limitations in actual use.

[0003] On the whole, there is still a lack of a system that can effectively monitor the status of each box door remotely without affecting the quality of link services

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