Human hand used as an infrared source to reveal secret messages
Physics World
APRIL 18, 2021
The human hand can be used as an infrared radiation (IR) source to decrypt hidden messages and register sign-language-style finger gestures, researchers in China have shown. The concept could find application in anticounterfeiting and gesture-driven control of devices. The human body, like all matter, emits thermal radiation – specifically at infrared wavelengths (IR).
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