radar
An aircraft detecting device is commonly referred to as an "aircraft radar" or "radar system." These systems are used to detect and track aircraft in the sky, providing information on their position, altitude, and speed. Other related technologies include transponders and ADS-B (Automatic Dependent Surveillance–Broadcast), which enhance situational awareness for air traffic control and pilots.
e-nose
A device for detecting underwater objects is typically called a sonar device. Sonar uses sound waves to detect and locate objects underwater by measuring the time it takes for the sound waves to bounce off the object and return to the device.
None. The megapixels are in the detecting device. e.g. a camera, a CCD device.
IFF (identification of friend and foe device) will detect the enemy aircraft. Radar system also plays role in this operation.
It's called a "Motion Detector"!
A Passive InfraRed Sensor (PIR)
The Piranah Water 3000
A stabilator is a ten letter word for an aircraft's climb control device. A Beechcraft P35 Bonanza has such device which is a mix of a vertical stabilizer and an elevator.
Alexander Popov was one of the first to create a radar device. His device, created in 1895, was meant for detecting lightning strikes.
A microphone detects sounds transmitted in the air.
The red light blinking on your device's motion sensor indicates that it is detecting movement or activity in its vicinity.