Low-temperature atomization trace showing instrument and working method of low-temperature atomization trace showing instrument

Abstract

The invention discloses a low-temperature atomization trace showing instrument which is characterized by comprising a box, a control unit, a temperature-humidity sensor, a refrigerating unit, a humidification unit and a power supply module. The temperature-humidity sensor, the refrigerating unit and the humidification unit are arranged in the box, the control unit is respectively connected with the temperature-humidity sensor, the refrigerating unit and the humidification unit, and the power supply module is connected with the control unit, the temperature-humidity sensor, the refrigerating unit and the humidification unit. A working method includes the steps that the refrigerating unit and the humidification unit are controlled by the control unit to carry out refrigerating and humidification, the temperature and the humidity in the box are transmitted to the control unit through the temperature-humidity sensor to enable the interior environment of the box to be a constant-temperature and constant-humidity environment, thin even water mist is formed on the surface of an evidence object placed in the box, and a trace is shown. The low-temperature atomization trace showing instrument and the working method have the advantages that evidence obtaining deviation or evidence object damage and the like caused by improper manual operation in a traditional complex powder collecting mode is avoided, repeated collecting can be carried out on the evidence object, and secondary evidence obtaining is facilitated.

Description

(1) Technical field: [0001] The invention relates to an evidence collection device, in particular to a low-temperature atomization trace display device and a working method thereof. (2) Background technology: [0002] At present, it solves the problems of difficult extraction of traces (including fingerprints, footprints, lip prints, skin prints, etc.) left on the surface of smooth objects in criminal technology, serious pollution during extraction, and great impact on later DNA extraction and testing. [0003] Fingerprints are the first evidence, and the discovery and extraction of fingerprints is the first step in obtaining criminal evidence and an important part of case scene investigation. However, the discovery, extraction, and utilization of fingerprints are difficult to find and extract, the method is single, the scope of applicable objects is narrow, the environment is seriously polluted, and the body and environment of technicians and object owners are greatly damag...

AI Technical Summary

Problems solved by technology

This complex extraction method often causes irreparable damage to evidence due to human judgment or operational errors

Most of the extraction methods are one-time evidence collection. If the forensics personnel lack experience or make mistakes in judgment, resulting in extraction failure and damage to fingerprint evidence, it is very likely that important clues and strong evidence will be lost, which will cause a huge obstacle to solving the case.

Taking the physical extraction method as an example, it is not uncommon for fingerprints to be destroyed when swiping powder due to improper operation of forensics personnel.

[0017] In addition, the traditional methods of displaying fingerprints and other traces mostly use powder and chemical reagents to display, and the pollution is too large, which will cause great damage to the object, the environment and the health of the technicians. Therefore, it is urgent to explore a convenient, efficient, non-destructive, non-toxic and harmless inspection method

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