radar
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.
An acoustic mirror is a large dish-shaped structure designed to amplify and reflect sound waves. They were used in the early 20th century for detecting approaching aircraft before the invention of radar. Acoustic mirrors are now considered historic relics.