There are cameras that can see infrared and ultraviolet, what about microwaves and other wavelengths?
If we had a camera that only images microwaves for example, could we see wi-fi and Bluetooth as they reflect off surfaces?
What are the main limitations of building something like this? Is it the size difference between wavelength and sensor size?
In: Physics
Microwaves are defined as the part of the electromagnetic spectrum with wavelength between one millimeter and one meter. Radar in the millimeter wave range is used for fire control on the [Longbow variant of the AH-64](https://www.northropgrumman.com/what-we-do/an-apg-78-longbow-fire-control-radar) We know that it produces images, but information is not available as to how much resolution it has. We do know that it can track 256 separate moving targets.
Milimeter wave radar can see a human through a wall, but [the image is more of a point cloud than a “picture”](https://ksp-windmill-itn.eu/research/fmcw-mmwave-radars-can-see-through-walls/) [There is a company using AI to interpret those point clouds, and they claim to be able to see human outlines using only a consumer WiFi router as the emitter.](https://www.sify.com/technology/this-neural-network-uses-wifi-to-see-through-walls/) This is about as close as it comes to a camera. WiFi is 6 or 12cm wavelength, well within the microwave range.
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