Non-contact detection of skin moisture based on near-infrared LED lighting

摘要

The near-infrared (IR) wavelength of 950nm and 1450nm was used as the main LED sources.The penetration and reflection system were set up for the non-contact detectors. In order toenhance the IR signal that a condenser lens was used to focus the light intensity to 5.84 times,an amplifier was used to transform current signal to voltage signal, and the other amplifierwas used to magnify the voltage signal to 49.5 times. Anyway, the source of 1450nm showedthe good absorbent response of skin moisture was better than that of 950nm.