A monitoring system according to the present disclosure includes a cable (20) comprising an optical fiber, a reception unit (31) configured to receive an optical signal including a pattern corresponding to a state of a monitoring target (10) from at least one optical fiber included in the cable (20) and to detect the pattern from the received optical signal, and a control unit (32) configured to detect the state of the monitoring target (10) based on the pattern.

In a monitoring system using optical fibers, an area to be monitored is divided into zones where each zone has fibers which create a change in a signal transmitted by the fiber in response to an event to be monitored. The fibers all communicate to a common monitoring system having a channel for each zone. The fiber of a second one of the zones communicates to the respective channel of the common monitoring system through a fiber passing through a first one of the zones so that the fiber and thus the second channel is also responsive to an event in the first zone zones. The invention provides a method of distinguishing between the separate zones where events have occurred by a Boolean analysis of the signals in the different channels.

A monitoring system according to the present disclosure includes a cable (20) comprising an optical fiber, a reception unit (31) configured to receive an optical signal including a pattern corresponding to a state of a monitoring target (10) from at least one optical fiber included in the cable (20) and to detect the pattern from the received optical signal, and a control unit (32) configured to detect the state of the monitoring target (10) based on the pattern.

A method of monitoring a fence or other containments barrier for climbing events by an intruder comprises providing a first and second sensors at different heights on the fence, detecting from each of the sensors signals which are indicative of vibration of the fence, and comparing the signals from the first and second sensors to determine vibration events which change in relation to a height of the intruder on the fence indicative of climbing so as to distinguish climbing events from incidental events and to provide a signal in response thereto.

A long-distance optical cable physical safety monitoring system, including a light source module, a light interference module, a sensing module, a reflection module, a photovoltaic conversion module, and a data processing module. The light interference module is use for dividing a light beam into multiple light beams; the sensing module is use for transmitting the multiple light beams; the reflection module is used for reflecting the multiple light beams to make the light interference module to output an interference signal; the photovoltaic conversion module is used for converting the interference signal to obtain a data signal; the data processing module is used for processing the data signal. The long-distance optical cable physical safety monitoring system is passive, low in energy consumption, anti-jamming, low in false positive rate, simple in construction, and convenient in maintenance.

In an optical fiber monitoring system which detects physical disturbance or other parameters such as temperature or strain of a fiber where a monitor signal is transmitted along the optical fiber and analyzed to detect changes which are indicative of an event, a method is provided for periodically checking proper operation of the optical fiber monitoring system. A fiber disturbance actuator periodically causes a pattern of disturbances of a portion of the fiber at a predetermined location thereon where the disturbance is characteristic of the event to be monitored. The monitor signal is analyzed to detect the pattern of changes and in the event that expected changes are not detected, a warning is issued that the intrusion detection system is not properly operating.

A detection system for measuring one or more condition within a predetermined area includes a fiber harness having at least one fiber optic cable for transmitting light. The at least one fiber optic cable defines a node arranged to measure the one or more conditions. A light source is coupled to the at least one fiber optic cable for emitting a modulated light to the node. The modulated light is transmitted into the predetermined area. A light sensitive device is coupled to the at least one fiber optic cable for receiving scattered light associated with the node. A control unit is operably coupled to the light source and to the light sensitive device to determine at least one of a presence and magnitude of the one or more conditions within the predetermined area.

A detection system for measuring one or more conditions within a predetermined area includes a fiber harness having at least one fiber optic cable for transmitting light. The at least one fiber optic cable defines a node arranged to measure the one or more conditions. A control system is operably coupled to the fiber harness such that scattered light associated with the node is transmitted to the control system. The control system analyzes the scattered light to determine at least one of a presence and magnitude of the one or more conditions at the node.

A monitoring system according to the present disclosure includes a cable (20) comprising an optical fiber, a reception unit (31) configured to receive an optical signal including a pattern corresponding to a state of a monitoring target (10) from at least one optical fiber included in the cable (20) and to detect the pattern from the received optical signal, and a control unit (32) configured to detect the state of the monitoring target (10) based on the pattern.

The application provides a interface light path structure with all polarization-maintaining function. A first polarization-maintaining-transferring device includes a first port, a second port, and a third port, wherein the first port receives a first polarized light output by the polarization beam-splitting device, the second port is connected to the first Faraday rotation mirror, and the third port is connected to a first port of the first polarization-maintaining coupler. A second polarization-maintaining-transferring device includes a first port, a second port, and a third port, wherein the first port receives a second polarized light output by the polarization beam-splitting device, the second port is connected to the second Faraday rotation mirror, and the third port is connected to a second port of the first polarization-maintaining coupler.