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
Airport Security Scanners (the booths you stand in with your arms up) use *millimeter* radar to image the person and detect things under clothes. They have enough resolution to require blurring of genital regions. But they also have a large rotating antenna to capture that image. Microwaves in the centimeter range would capture significantly less detail and need larger antenna due to the longer wavelength.
Using multiple antenna to monitor wifi signals, you can detect changes in signal patterns as people move around a room (i.e. static environment), but at very low resolution.
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