抄録
This study developed a new nondestructive detection method of latent fingerprints by infrared (IR)ray. For this purpose, IR-spectrum of human epidermal secretion was measured at a wavelength from 3,800cm-1 to 600cm-1 after preparation of the sample tablet by impressing a finger lightly on the surface of the KBr tablet.
As a result, maximum absorption was observed at around 2920cm-1 (3.4 μm). Based on this result, infrared-television system (IR-TV) was introduced for detection of fingerprints.
Specimens of fingerprints were prepared by impressing a finger on a plastics surface. Detection method of the latent fingerprints was studied using IR-TV attached with IR filter using 4 kinds of IR ray source. The IR ray sources used were a common tungsten lamp, xenon lamp (300-680 μm), IR-lamp (6 A , 250W), and a hair dryer (100A, 500W). As a result, latent fingerprints on the plastics was detected on the IR-TV display monitor using the IR lamp and hair dryer as an IR ray source.
