Defense contractor Anduril has unveiled a new family of passive infrared sensors called Iris that are tailored for use on aircraft, especially drones. Iris sensors are intended to be readily ...

(Passive InfraRed sensor) A device used to detect motion by receiving infrared radiation. When a person walks past the sensor, it detects a rapid change of infrared energy and sends a signal.

IRST (thermal sensor, thermolocator) is an infrared ... Older machines—originally lacking the sensor—are also being equipped with it through hanging pods, significantly increasing passive ...