Imagine you're in a room, and there's another room next to it. You can’t see what’s on the other side of the wall, but what if you had a special camera that could send out invisible waves? These waves go through the wall and come back with information about what's on the other side, just like an echo. That's how seeing through walls works!
Examples
- A firefighter uses a special camera to see if someone is trapped behind a wall.
- A police officer uses through-wall imaging to find out how many people are inside a building.
- You use a special app that lets you peek into your neighbor’s house from yours.
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See also
- How Do Touchscreens Know Where You Tap?
- How do touchscreens detect your finger's input?
- How Do Smartphones Know When to Vibrate?
- What is scanner?
- What are thermal sensors?