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Device and method used for detecting sweat latent fingerprints on large breadth material to be detected

A large-format, material-detecting technology, applied in measurement devices, analytical materials, material excitation analysis, etc., can solve the problems of low fingerprint detection rate, damage to fingerprint originals, low power density of ultraviolet laser, etc. Improve the detection rate and the effect of large inspection material format

Inactive Publication Date: 2019-03-05
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0007] 1) The detection effect of physical visualization method and chemical visualization method is poor and may damage the original fingerprint
[0008] 2) Ultraviolet reflection imaging method is not effective in detecting old sweat latent fingerprints
[0009] 3) When ultraviolet light-induced fluorescence imaging is used to detect sweat latent fingerprints, due to the low power density of the ultraviolet laser obtained on the test material, the fluorescence of sweat latent fingerprints on the test material cannot be effectively excited, so there is also a low detection rate of fingerprints , unable to achieve rapid and high-sensitivity detection of large-format inspection materials

Method used

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  • Device and method used for detecting sweat latent fingerprints on large breadth material to be detected
  • Device and method used for detecting sweat latent fingerprints on large breadth material to be detected

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Embodiment

[0055] The large format sweat latent fingerprint detection device of the present invention is as figure 1 As shown, the dominant wavelength of the deep ultraviolet laser described in this embodiment is 266nm, the output energy is 66μJ@6kHz, the average optical power is 400mW@6kHz, the pulse width is 20ns, the peak optical power is 3.3×103W@6kHz, and the energy The density is 0.013J / cm2@6kHz. According to the specific spatial arrangement, the number of reflecting mirrors in this embodiment is three, which are respectively the first reflecting mirror 102 , the second reflecting mirror 103 and the third reflecting mirror 104 . In criminal cases, important large-format evidence materials are mainly paper. In this embodiment, A4 paper is selected as the large-format inspection material. The size of A4 paper is 210mm×297mm. The two-dimensional electric table 401 is used to carry A4 paper Two-dimensional translation is performed in a stepping manner, so the stepping distance of the ...

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Abstract

The invention discloses a device and a method which are used for detecting sweat latent fingerprints on large breadth material to be detected. The device comprises a deep ultra-violet laser light source module, a dichronic mirror, a laser scanning optical conversion module, a two dimensional electric sample platform, a fluorescence detection module, and a control system. The device and the methodis capable of realizing preferable excitation of sweat latent fingerprint excited intrinsic fluorescence at 365nm, and increasing sweat latent fingerprint detection rate, and can be used for materialswith larger breadth; and the detection resolution can be changed based on need.

Description

technical field [0001] The invention relates to the technical field of sweat latent fingerprint detection, in particular to a device and method for sweat latent fingerprint detection on large-format inspection materials. Background technique [0002] Since the theory of "fingerprints remain unchanged for life" was put forward in the middle of the 19th century, fingerprint detection, as a traditional and basic personal identification method, has played an important role in the investigation of criminal cases. Most of the fingerprints are sweat latent fingerprints, which cannot be directly observed by the naked eye, and need to be displayed or enhanced into clear visible fingerprints by using fingerprint visualization methods. [0003] Traditional fingerprint visualization methods mainly include physical visualization and chemical visualization. These methods are simple and easy to operate, such as physical visualization using powder or fumigation technology, and chemical visu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
CPCG01N21/6456
Inventor 黄立华赵成屈建峰凌丽青张善华郭凯黄惠杰
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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