Common applications include search and rescue, surveillance, and customer analytics (for example, people counters).
A test is presented to detect that a computer is being used by a human operator, preventing access to a protected resource by programs such as spam robots.
Various commercial heartbeat detection systems employ a set of vibration or seismic sensors to detect the presence of a person inside a vehicle or container by sensing vibrations caused by the human heartbeat.
[2][3][4] Another commercial product uses infrared light to detect the level of carbon dioxide in an enclosed space, from which it infers the presence of humans or other living creatures.
[7] In September 2014, the DHS promoted the technology to SWAT teams at the Urban Shield trade show.