An apparatus and method for detection of methane in an environment, including a housing with a sensor printed circuit board and a processor printed circuit board interconnected to and thermally insulated from the sensor printed circuit board. The sensor printed circuit board includes a first tuning fork isolated from the environment, and a second tuning fork exposed to the environment. The tuning forks are attached to opposite sides of the sensor printed circuit board. The processor printed circuit board includes processing circuitry interconnected to the first tuning fork and the second tuning fork, which receives vibration frequency signals therefrom, and is programmed to determine a frequency difference between the frequency of vibration of the first tuning fork and the frequency vibration of the second tuning fork, and if the frequency difference is greater than a predetermined threshold, then setting an alarm to indicate the presence of methane.

Systems and methods for adjusting a broadcast pattern of an intrusion detector are provided. Such systems and methods can include a microwave sensor of the intrusion detector broadcasting a detection signal into a secured area in the broadcast pattern, a communication module of the intrusion detector wirelessly receiving a signal adjustment command from a remote device, and a processor and executable control software of the intrusion detector parsing the signal adjustment command and instructing a signal adjuster of the intrusion detector to adjust a sensitivity of the microwave sensor or an amplitude of the detection signal to alter the broadcast area of the broadcast pattern based on information contained in the adjustment command.

Comprehensive system for fire detection and implementing thereof. The disclosed system combines and optimizes optical, electrical, and sensor sub-systems to provide the functionality demanded by the market. While many of the individual functions exist separately, none of the existing products combine elements from different sub-systems to provide a much higher level of functionality. The present disclosure shows how to build a very compact housing around the smoke detector while keeping the reflections from the housing structure to a very low value while satisfying all the other peripheral needs of fast response to smoke and preventing ambient light. This allows very small measurements of light scattering of the smoke particles to be reliable in a device resistant to the negative effects of dust.

Comprehensive system for fire detection and implementing thereof. The disclosed system combines and optimizes optical, electrical, and sensor sub-systems to provide the functionality demanded by the market. While many of the individual functions exist separately, none of the existing products combine elements from different sub-systems to provide a much higher level of functionality. The present disclosure shows how to build a very compact housing around the smoke detector while keeping the reflections from the housing structure to a very low value while satisfying all the other peripheral needs of fast response to smoke and preventing ambient light. This allows very small measurements of light scattering of the smoke particles to be reliable in a device resistant to the negative effects of dust.

A server system can receive an assertion of an alarm condition from a security system that processes sensor signals from sensors and that triggers the alarm condition. The server system is can send messages to determined nearby sensors to start sending data back to the server system according to the alarm condition. The server system can analyze sensor data received from the sensors. The analysis includes a verification of the alarm condition, a determination of how often queried data is requested, and a determination of which of selected data received from selected sensors to forward to one or more mixed reality devices. The server system can forward data to the one or more mixed reality.

A monitoring system that is configured to monitor a property is described. The monitoring system includes a sensor that includes a battery and that is configured to generate sensor data based on activity in a portion of the property that is within a field of view of the sensor. The monitoring system further includes a monitor control unit that is configured to: after replacement of a battery of the sensor, receive and analyze the sensor data, based on analyzing the sensor data, determine a status of the portion of the property without recalibrating the field of view of the sensor, and provide, for output, a notification that includes data describing the status of the portion of the property.

A monitoring system that is configured to monitor a property is described. The monitoring system includes a sensor that includes a battery and that is configured to generate sensor data based on activity in a portion of the property that is within a field of view of the sensor. The monitoring system further includes a monitor control unit that is configured to: after replacement of a battery of the sensor, receive and analyze the sensor data, based on analyzing the sensor data, determine a status of the portion of the property without recalibrating the field of view of the sensor, and provide, for output, a notification that includes data describing the status of the portion of the property.

A method that includes obtaining a sensor reading from a sensor installed inside an underground vault and determining whether the sensor reading is indicative of an alarm state. When the sensor reading is indicative of the alarm state, the method obtains at least one new reading and determines whether the sensor reading includes sensor drift based at least in part on the at least one new reading. The alarm state is established when the sensor reading is determined not to include sensor drift. The sensor drift is removed when the sensor reading is determined to include sensor drift.

Systems and methods are provided for configuring a sound system in a confined passageway. Techniques include installing a plurality of nodes with defined identities at intervals along a confined passageway. Each node includes a microphone and two loudspeakers directed in substantially opposite directions along the confined passageway. Communication is established between each of the nodes and a control system computer. In a first set of steps that is repeated, relative positions of all nodes communicating with the control system computer may be determined. In a second set of steps that is repeated, a distance may be computed for each pair of adjacent nodes of the plurality of nodes. The technique may then include storing the relative positions of all nodes and the computed distance between all adjacent nodes in the control system computer.

In a general aspect, a sensitivity setting is adjusted in a motion detection system. In some aspects, a user interface is provided by a motion detection system, and user input data is obtained through the user interface. A wireless communication link is identified based on the user input data; the wireless communication link is provided by a first wireless communication device and a second wireless communication device. Based on the user input data, a value is assigned to a sensitivity setting associated with the wireless communication link in the motion detection system. The motion detection system obtains data for motion detection based on wireless signals communicated through a space on the wireless communication link. Motion of an object in the space is detected based on the data and the value of the sensitivity setting.