An alarm screen comprises a frame comprising a laser sensor, a processing unit, and a wireless transmitter embedded in a hollow interior. The frame comprises an opening for the laser sensor to project a laser beam outside of the alarm screen. The laser sensor projects the beam through the opening, makes a set of one or more measurements of a distance between the laser sensor and an object in a path of the laser beam, and sends the set of measurements to the processing unit. The processing unit is configured to compare the distance measurements received from the laser sensor with a threshold distance detect, and send one or more signals to the wireless transmitter when at least one of the distance measurements received from the laser sensor exceeds the threshold. The wireless transmitter is configured to receive signals from the processing unit and wirelessly transmit the signals.

A system for monitoring the integrity of a plurality of ground conductors has a plurality of monitors, with a different monitor associated with each ground conductor. Each monitor includes a voltage sensor which monitors voltage on a closed circuit of the monitor. Upon the voltage sensor sensing an unexpected voltage, a transmitter of the monitor issues an “alarm” signal, which may be wireless (e.g., being sent using LoRaWAN protocol). The transmitter may issue other signals, including a periodic “heartbeat” signal to confirm continued operation of the monitor, and a “movement” signal to indicate movement of the monitor. The monitor may be GPS-enabled, in which case each signal may include the GPS coordinates of the monitor. The signals issued by the transmitter may ultimately be analyzed by an operator via a user interface platform, which may simultaneously display information regarding two or more of the plurality of monitors.

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.

An instrumentation system for a net barrier comprising at least one tension sensor node attached to one or more threads of said net barrier is described. Also described is a sensor node, and use of this sensor node.

A system for monitoring the integrity of a plurality of ground conductors has a plurality of monitors, with a different monitor associated with each ground conductor. Each monitor includes a voltage sensor which monitors voltage on a closed circuit of the monitor. Upon the voltage sensor sensing an unexpected voltage, a transmitter of the monitor issues an “alarm” signal, which may be wireless (e.g., being sent using LoRaWAN protocol). The transmitter may issue other signals, including a periodic “heartbeat” signal to confirm continued operation of the monitor, and a “movement” signal to indicate movement of the monitor. The monitor may be GPS-enabled, in which case each signal may include the GPS coordinates of the monitor. The signals issued by the transmitter may ultimately be analyzed by an operator via a user interface platform, which may simultaneously display information regarding two or more of the plurality of monitors.

A perimeter security fence includes a plurality of vertical fence posts spaced from one another along a fence line of the perimeter security fence, each vertical fence post having an upper end and a lower end. A wire receiving slot is formed in each vertical fence post. Each wire receiving slot having an open, upper end and a closed, lower end. One or more conductive wires or cables are disposed within the wire receiving slots of the vertical fence posts. At least one reinforcing plate is secured to each vertical fence post for covering a gap in the vertical fence post defined by the wire receiving slot. The at least one reinforcing plate is configured to enhance the structural integrity of the vertical fence post in the vicinity of the wire receiving slot and retain the one or more conductive wires or cables within the wire receiving slot. One or more security devices are secured to the perimeter security fence and are coupled with the one or more conductive wires or cables disposed within the wire receiving slots of the vertical fence posts.

An instrumentation system for a net barrier comprising at least one tension sensor node attached to one or more threads of said net barrier is described. Also described is a sensor node, and use of this sensor node.

A cable pull switch includes a polychotomous sensor configured to provide a reading of at least one of a plurality of values, the reading corresponding to a tension on a pull cable or a linear displacement of an end of a pull cable. A processor coupled to the polychotomous cable pull sensor configured to determine a rate of change of the value of the reading from the sensor and determine an occurrence of a cable pull event, the determination based on the determined rate of change of the value, and determine whether the rate of change of the value of an electrical resistance through the polychotomous cable pull sensor is below a threshold rate of change value, and adjust an upper pull threshold value to a new upper pull threshold value that is based on a present reading of the value of the electrical resistance through the strain gauge.

An electric fence alert assembly includes a control box that is mountable to a fence post of an electric fence. The control box is place in electrical communication with a power supply of the electric fence, a respective one of a ground rod of the electric fence and a fence wire of the electric fence. A signal analyzer is positioned within the control box and the signal analyzer is in electrical communication with the electric fence. A transceiver is positioned within the control box and the transceiver is in wireless communication with a personal electronic device. Moreover, the transceiver broadcasts an alert signal to the personal electronic device when the signal analyzer determines that a fault has occurred in the electric fence to alert a user that the fault has occurred.

Systems and techniques are described for monitoring an electronic pet fence at a residential facility. In some implementations, a monitoring system monitors a property that includes sensors located throughout the property that generate sensor data and an electronic fence transmitter that is configured to detect movement of an electronic device across an electronic fence. An electronic fence supervisor is configured to detect an error in the electronic fence transmitter or the electronic fence. In response to detecting the error, the electronic fence supervisor generates data indicating the error. A monitor control unit is configured to receive the data indicating the error and sensor data. Based on the data indicating the error and the sensor, the monitor control unit selects, from among multiple monitoring system actions, a monitoring system action. The monitor control unit performs the monitoring system action.