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
Yes, we call them weather radars. The standard 2400 MHz frequency used by a microwave oven is chosen because it is absorbed and reflected by water.
If you send out signals with a very directional antenna, and have a similar setup to receive the pulses, you have a camera (actually more of a scanner) that creates a picture of where water is ahead of you.
There are array antennas but I don’t think they really act like a camera, just a means of focusing the signals from one very specific direction.
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