Sensors

Infrared sensors

rely on infrared light, or heat radiation. They look for changes in infrared radiation in a room or space and alert when that change occurs. They are inexpensive and commonly deployed in well-controlled, smaller indoor spaces

Pressure sensors

detect a change in pressure. While not commonly deployed in most environments, they may be used when an organization needs to detect an object being moved or when someone is moving through an area using a pressure-plate or pad

Microwave sensors

use a baseline for a room or space that is generated by detecting normal responses when the space is at a baseline. They are generally more sensitive and more capable than infrared sensors. They can detect motion through more materials and can work through a broader range of temperatures. More expensive and more error prone than infrared

Ultrasonic sensors

are uncommon in commercial security systems but may be used in specific circumstances. _____ are more commonly used in applications where proximity detection is required