掠入射偏振光照相方法显现电脑电源接线头上灰尘指纹

On the glancing incidence and polarization photography recovering the dust fingerprints on power source connecting plug of computers

电脑盗窃案中,电脑电源接线头常常留有案犯的灰尘指纹,电源接线头表面粗糙不平,凹凸深度较大,灰尘指纹纹线较细,若用胶带粘取,指纹纹线会弥合,这就破坏了指纹。采用掠入射照相的原理加偏振光照相的方法可以将电源接线头上的灰尘指纹显现出来。

In the eases of computer burglary, the dust fingerprint of offenders often leave on the power source connecting plug of computers. The surface of connecting plug is coarse and scraggy, and the ridge of fingerprint on the surface is thinner. Recovering the fingerprint with adhesive tape will make the ridge of fingerprint together and even damage the fingerprint. It is feasible to recover the dust fingerprint on the power source connecting plug with the application of glancing incidence photography and polarization photography.