Human sensing

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Human sensing is a group of technologies that detect whether a person is in a space, usually without the person taking part. It helps with search and rescue, security, and counting how many people are around.

Common examples:
- CAPTCHA: online tests that prove a user is human and not a robot.
- Vibration or seismic sensors: detect a person’s heartbeat to know someone is inside a vehicle or container.
- Infrared sensors: measure carbon dioxide levels to guess if people are present in an area.
- Radar technology (like FINDER): can sense a person’s breathing and heartbeat even through walls or rubble.
- Safety devices: help protect people who shelter inside bins or similar spaces.

In short, human sensing uses signals like movement, heartbeat, or breathing to identify people without them having to actively say they’re there.