Detection of fingerprint using He-Ne (632.8 nm) and Diode (532 nm) lasers

Abstract

Fingerprints have many uses, chemical solution usually used to detect fingerprints but it takes a time. In this research He-Ne laser with output power 1mmW and wavelength 632.8nm and Diode laser with output power 5mmW and wavelength 532 nm were used to detect fingerprints on Aluminum surface and other Glass surface, fingerprints was exposure by laser beam through convex lens with focal length 5mm then a digital camera was used to record irradiated fingerprint. The revealed results show clear images for the fingerprints using two types of lasers He-Ne and Diode and appearing its characteristics on different surfaces obviously. Laser method to detect fingerprints is a simple method using low level lasers without chemicals, in short period of time, with low cost and gives good results.