On-site fingerprint search evidence-obtaining device and evidence-obtaining method thereof

Abstract

The invention relates to an on-site fingerprint search evidence-obtaining device, which comprises a movable shell, an imager, a combined light source, a combined light source lifting mechanism and a controller. The imager and the combined light source are arranged in the movable shell, the imager is located above the combined light source, and the combined light source comprises a mercury lamp anda multi-spectrum LED light source; the combined light source lifting mechanism and the controller are fixed to the movable shell, and the combined light source lifting mechanism is used for driving the combined light source to ascend and descend; the signal input end of the controller is connected with the signal output end of the imager, the output end of the controller is connected with the control input end of the combined light source lifting mechanism, and the controller is provided with a display screen so as to display images collected by the imager. The invention further discloses anon-site fingerprint search evidence-obtaining method. According to the invention, multi-spectrum multi-angle light distribution fingerprint images can be acquired, and the operation is easy.

Description

technical field [0001] The invention relates to the field of forensic science, in particular to the evidence collection technology of on-site fingerprints. Background technique [0002] Since Americans first introduced lasers into the field of fingerprint visualization in 1978, more attention has been paid to using optical methods to visualize physical evidence. Although the laser has high intensity and good monochromaticity, the laser is bulky and heavy. The cost is also very high, so it is difficult to be widely used in criminal investigation scenes. In order to give full play to the application of various optical inspection methods in physical evidence exploration, foreign countries began to try to replace lasers with multi-band light sources in the late 1980s. A multi-band light source generally consists of three parts: a light source system, a color filter system and a light guide. At present, tungsten-halogen lamps or xenon lamps are generally used as light sources. ...

AI Technical Summary

Problems solved by technology

[0004] To sum up, some achievements have been made in the optical visualization of potential physical evidence at home and abroad, but there are many kinds of optical visualization methods, the operation is relatively cumbersome, and the difference in the technical level of personnel often affects the quality of evidence collection.

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