266 nm陶瓷激光器反射照相在指纹显现中的应用

The Application of 266 nm Ultraviolet Ceramic Laser in Visualization Latent Fingerprints by Reflection

摘要: 本文研究潜在指纹显现的新技术，用自主研发的266 nm短波紫外陶瓷激光器作为光源照射检材，通过反射照相方法显现各种非渗透性客体表面的潜在指纹。紫外陶瓷激光器能有效显现出光滑客体表面的潜在指纹，并且油脂指纹检出率高于汗液指纹检出率。陶瓷材料由于其良好的化学稳定性、耐高温性、尺寸稳定性、光漫反射特性等优点，利用该266 nm短波紫外陶瓷激光器可以显现非渗透性客体表面的潜在指纹，在刑侦领域上有较好的应用前景。

Abstract: This paper describes visualization of latent fingerprints by 266 nm ultraviolet ceramic laser. Self-made 266 nm ultraviolet laser with a ceramic gain medium was used to illuminate the latent fingerprints on the non-porous substrates. The images were recorded by ultraviolet camera through reflection photography. The results showed that the marriage of ultraviolet ceramic laser and reflection photography was an effective method on visualization of latent fingerprint on non-porous substrates. The visualization rate of oil fingerprints is higher than the sweat fingerprints. Ceramic materials have the advantages of good chemical stability, high-tem- perature resistance, size stability and light diffuse reflection. The 266 nm ultraviolet ceramic laser could be adopted to the visualized latent fingerprints on the non-porous substrates. The ultraviolet ceramic laser operating at 266 nm has potential application in the field of criminal investigation.