Infrared detectors are devices designed to detect and respond to infrared radiation. They can be used in a variety of different applications and industries, such as security, industrial automation, and building automation. In security systems, infrared detectors are used to detect unauthorized entry or object movement within a given area. Industrial automation systems use infrared detectors to detect product movement through the manufacturing process. In building automation systems, infrared detectors are used to regulate the temperature within the building and control lighting. Infrared detectors work by capturing infrared radiation and converting it into electrical signals. These signals are then used to trigger an alarm or control an automated system.