A team of researchers at Shanghai Jiao Tong University has found that the human hand can be used as a powerless infrared radiation source (IR) in several kinds of applications. In their paper published in Proceedings of the National Academy of Sciences, the group notes that the human hand naturally emits IR, and they demonstrate that the radiation can be captured and used.
The human body emits light in the invisible IR region, including the hands. This source of radiation, the researchers noted, could potentially be captured and used in applications ranging from signal generation to encryption systems. They further noted that because the hand has multiple fingers, the IR that it emits could be considered multiplexed.
IR is a form of electromagnetic radiation ̵
The team started by creating a device that was capable of separating the IR emitted by a hand from the surrounding IR. They then sprayed a low-reflective material on an aluminum base and found that the two devices together could be used to encrypt messages at ambient temperatures. They noted that when a human hand was used as a light source for the device, its IR emissions were reflected by all the regions that included them with high IR – the higher the rise in IR allowed the device to differentiate IR radiation, which provided a means of building in a decryption process. The researchers suggest that their device proves that human hand-generated IR is sufficient to build IR-based devices. They also note that their device could be modified to allow the use of fingers as encryption keys.
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Shun An et al. Human hand as a powerless and multiplexed infrared light source for information encryption and complex signal generation, Proceedings of the National Academy of Sciences (2021). DOI: 10.1073 / pnas.2021077118
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Citation: Use of the human hand as a powerless infrared radiation source (2021, April 8) retrieved April 8, 2021 from https://phys.org/news/2021-04-human-powerless-infrared-source.html
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