Monitoring system of optical fiber remote multi-point switch status

Abstract

The invention belongs to fields of sensing technique monitoring. It discloses an optical fibre remote multi-point switch state monitoring system. It includes industry controller, optic time domain reflector, optical path distributing device and magneto optical journey switch; it possesses several the optical path distributing devices, it separately includes one input and two outputs, one output of the optical path distributing device is connected with input of magneto optical journey switch, the another output of the optical path distributing device is connected with input of later optical path distributing device, several magneto optical journey switches are connected parallel via optical path distributing device, adjacent optical path distributing device, the optical path distributing device and magneto optical journey switch, and adjacent optical path distributing device are connected via communication cable. The invention is insulated, safe, locale dues not need electricity, it adopts non-contact magneto optical journey switch, and structure is easy, can fit for high-voltage, high-powder, and damp circumstance.

Description

technical field [0001] The invention belongs to the technical field of sensor monitoring, and relates to a switch state monitoring system, in particular to a remote multi-point switch state on-line monitoring system suitable for working in harsh environments such as high voltage, flammable, and no power supply on site. Background technique [0002] Due to the diversification of monitoring environment and needs, the performance and adaptability of sensors are increasingly required, and the traditional switch monitoring system can no longer meet the stringent detection requirements. For example, the monitoring systems mentioned in patents 200310105802.0 and 02238116.3 are not suitable for high-voltage, flammable and other environmental conditions due to the use of electric excitation. If there is no power supply on site or electricity is prohibited, then these products will be useless . [0003] The latest optical fiber sensor, patent No. 200510025483.1, although it solves th...

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Problems solved by technology

[0002] Due to the diversification of monitoring environments and requirements, higher and higher requirements are placed on the performance and adaptability of sensors. The traditional switch monitoring system can no longer meet the stringent detection requirements.

For example, the monitoring systems mentioned in patents 200310105802.0 and 02238116.3 are not suitable for high-voltage, flammable and other environmental conditions due to the use of electric excitation. If there is no power supply on site or electricity is prohibited, then these products will be useless

[0003] The latest optical fiber sensor, patent No. 200510025483.1, although it solves the problem of working in a high-voltage environment, still has the following disadvantages: single-point sensing, when there are many measured objects or scattered distribution, a single system appears to be Powerless; the sensing method is contact, has mechanical friction, is easy to damage and has limitations in installation; the sensor structure is complex and difficult to popularize; photoelectric converters are required to convert optical signals into electrical signals, which is not suitable for long-distance monitoring

[0004] Although the invention patents with patent numbers 89107596.8 and 92115028.8 have realized long-distance multi-point monitoring, the fatal disadvantage is that these systems require on-site power supply

In recent years, fiber grating monitoring technology, which is more popular in recent years, has limited its development in this field due to its high cost, contact sensing, high possibility of abnormal failure, and limited number of sensors connected in series.

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