SKIN DETECTION SENSOR

摘要

A device for detecting the presence of human skin includes a blue LED light source emitting light from about 400 nanometers (nm) to about 500 nm, and preferably from about 450 nm to about 485 nm. Most preferred is a blue LED with a wavelength of about 468 nm. The light is reflected off a target proposed to be human skin and received by a photo detector. The known value for human skin is compared to the signal detected. Other materials that have been used to spoof detectors have different values and thus are distinguished from human skin.