Vapor type potential fingerprint showing device

Abstract

The invention discloses a vapor type potential fingerprint showing device, which is formed by connecting a vapor generator, an air pressurizing heating device and a ventilation tube, wherein one end of the ventilation tube is provided with an air outlet, and the other end of the ventilation tube is provided with an air inlet; in the vapor generator, a heating disk is arranged below a container; a vapor outlet is formed above the container; the vapor outlet is communicated with the side face of the air outlet end of the ventilation tube through an air guide tube; in the air pressurizing heating device, a heating cover is arranged at the air inlet of the ventilation tube; a heating wire is arranged in the heating cover; and a draught fan is arranged at the inlet of the heating cover. The vapor type potential fingerprint showing device is used for showing potential fingerprints left on smooth surfaces which are transparent or are weak in moisture absorption capability.

Description

technical field [0001] The invention relates to a fingerprint display device used in public security criminal investigation, in particular to a steam-type latent fingerprint display device. Background technique [0002] In the process of investigation and evidence collection of public security criminal cases, it is necessary to perform fingerprint visualization on the surface of suspect materials to find sweat fingerprints of suspects, so as to achieve the purpose of solving criminal cases. At present, for smooth objects left on transparent or weak moisture absorption To extract the potential fingerprints on the surface, the "breathing method" is usually used, that is, breathing on the suspected fingerprints on the surface of the object, because this method is only suitable for seasons with low temperature differences, which is not conducive to large-scale search and discovery Fingerprints, and often due to the amount of breathing and the length of stay after breathing affec...

AI Technical Summary

Problems solved by technology

[0002] In the process of investigation and evidence collection of public security criminal cases, it is necessary to perform fingerprint visualization on the surface of suspect materials to find sweat fingerprints of suspects, so as to achieve the purpose of solving criminal cases. At present, for smooth objects left on transparent or weak moisture absorption To extract the potential fingerprints on the surface, the "breathing method" is usually used, that is, breathing on the suspected fingerprints on the surface of the object, because this method is only suitable for seasons with low temperature differences, which is not conducive to large-scale search and discovery Fingerprints, and often due to the amount of breathing and the length of stay after breathing affect the appearance of fingerprints, and even destroy the fingerprints checked, and will also cause DNA pollution by saliva and droplets, thus affecting subsequent inspections and full use of physical evidence, losing further Therefore, there is a great need for a potential fingerprint display device that is not limited by temperature and is suitable for leaving on transparent or slippery surfaces with weak moisture absorption

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