Radar and "ordinary camera, thermal imager, infrared camera this kind of" difference

Radar: It detects targets and determines their spatial position by radio. Therefore, radar is also called "radiolocation". Radar is an electronic device that uses electromagnetic waves to detect a target. Radar emits electromagnetic waves to illuminate a target and receives their return, thus obtaining information such as the distance from the target to the point where the electromagnetic waves are emitted, the rate of change of the distance (radial velocity), the bearing, the altitude, and so on.

Camera: also known as computer camera, computer eye, electronic eye, etc., is a video input device, is widely used in video conferencing, telemedicine and real-time monitoring. Ordinary people can also talk and communicate with each other over the Internet with images and sound through the webcam.

The thermal imaging camera is the use of infrared detectors and optical imaging objective lens to accept the target of the infrared radiation energy distribution graphic reflected in the infrared detector photosensitive elements, so as to obtain the infrared thermal image, this thermal image and the object surface heat distribution field corresponds to. In layman's terms, an infrared camera is the invisible infrared energy emitted by the object is transformed into a visible thermal image.

Infrared camera, is an ordinary camera with infrared light, and control with photosensitive electronic components.