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Method for visualizing explosion residues in latent fingerprints

A technology of explosive residues and ferric tetroxide, which is applied in the field of fingerprint identification of public security criminal technology, can solve the problems of difficulty in widely application of detection methods, interference of latent fingerprint identification, inability to detect fingerprints, etc., and achieves accurate and reliable detection, low cost, and conditions. mild effect

Active Publication Date: 2020-11-03
SOUTHWEST UNIVERSITY OF POLITICAL SCIENCE AND LAW
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using this method to detect fingerprints also has limitations. If the content of inorganic elements in the fingerprint is lower than the typical MXRF-ppm detection limit trace level, the fingerprint cannot be detected; before detection, the approximate location of the latent fingerprint needs to be known; The detection of fingerprints will detect the high-concentration elements on the surface of the printed matter, which will interfere with the identification of latent fingerprints
[0008]The above methods all have the disadvantages of high cost and low efficiency, and are limited by the inherent defects of the detection method and uncontrollable factors in the environment. difficult to apply widely
Moreover, the above method focuses on detecting the material components of fingerprints, and does not fully realize the synchronous display, identification and diagnosis of fingerprint morphological information and exogenous carrier information.

Method used

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  • Method for visualizing explosion residues in latent fingerprints
  • Method for visualizing explosion residues in latent fingerprints
  • Method for visualizing explosion residues in latent fingerprints

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A method for visualization of explosive residues in a latent fingerprint comprising the steps of:

[0043] S1, uniformly mix 2mol / L HCL solution and 3.0-7.0mg / mL OPD solution at a volume ratio of 2:3, and prepare reagent A;

[0044] S2, uniformly mix 1mol / L NaOH solution and 6.0-16.0mg / mL cyclodextrin solution at a volume ratio of 1:2, and prepare reagent B;

[0045] S3, using nanometer Fe3O4 powder to treat NO 2 - Latent fingerprints are revealed;

[0046] S4, put the latent fingerprint carrier into a clean container, inject solution A into the container, immerse the latent fingerprint in the solution, and let stand for 10 minutes;

[0047] S5, inject solution B into the solution, take out the fingerprint carrier after 10 minutes and let it dry naturally for visualization.

Embodiment 2

[0049] S1, uniformly mix 2mol / L HCL solution and 3.0-7.0mg / mL OPD solution at a volume ratio of 2:3, and prepare reagent A;

[0050] S2, uniformly mix 1mol / L NaOH solution and 6.0-16.0mg / mL cyclodextrin solution at a volume ratio of 1:2, and prepare reagent B;

[0051] S3, using nanometer Fe3O4 powder to treat NO 2 - Latent fingerprints are revealed;

[0052] S4, put the latent fingerprint carrier into a clean container, inject solution A into the container, immerse the latent fingerprint in the solution, and let stand for 10 minutes;

[0053] S5, inject solution B into the solution, take out the fingerprint carrier after 10 minutes and let it dry naturally for visualization.

[0054] S6, the fingerprint image after displaying is observed by means of the displaying observation system, which is a fluorescent fixed fingerprint image.

Embodiment 3

[0056] S1, uniformly mix 2mol / L HCL solution and 3.0-7.0mg / mL OPD solution at a volume ratio of 2:3, and prepare reagent A;

[0057] S2, uniformly mix 1mol / L NaOH solution and 6.0-16.0mg / mL cyclodextrin solution at a volume ratio of 1:2, and prepare reagent B;

[0058] S3, using nanometer Fe3O4 powder to treat NO 2 - Latent fingerprints are revealed;

[0059] S4, put the latent fingerprint carrier into a clean container, inject solution A into the container, immerse the latent fingerprint in the solution, and let stand for 10 minutes;

[0060] S5, inject solution B into the solution, take out the fingerprint carrier after 10 minutes and let it dry naturally for visualization.

[0061] S6, the fingerprint image after displaying is observed by means of the displaying observation system, which is a fluorescent fixed fingerprint image.

[0062] S7, use the programming in Matlab with HSV color space to process the color information of the picture into data, and construct the hu...

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Abstract

A method for visualizing explosion residues in latent fingerprints comprises the following steps: evenly mixing an HCL solution and an OPD solution to prepare a reagent A; uniformly mixing a NaOH solution with a cyclodextrin solution to prepare a reagent B, then using nano ferroferric oxide powder to display the latent fingerprint containing NO < 2 >, then using a solution A to immerse the latentfingerprint, standing for 10min, then injecting the solution B, taking out a fingerprint carrier after 10min, and naturally performing airing to display. The method has the beneficial effects that thecost is low, the equipment is portable, the operation is simple, the conditions are mild, the operation process is rapid and efficient, the damage to evidences can be effectively reduced, and the NO2in the latent fingerprint can be accurately and reliably detected.

Description

technical field [0001] The invention relates to the field of public security criminal technical fingerprint identification, in particular to a method for visualizing explosive residues in latent fingerprints. Background technique [0002] Fingerprints are formed by the joint action of heredity and environment, and have characteristics that vary from person to person and remain unchanged throughout life. Due to the influence of many factors such as genetic material, skin tissue structure, pathology and trauma, the mastoid lines of fingerprints have specificity, diversity and stability. Personal identification and identification provide a scientific basis. At the same time, due to the characteristics of leaving traces on objects, the fingerprints left on the object can truly reflect the fingerprint characteristics of the person left behind. basis plays an important role. [0003] Bombing cases are cases involving the use of explosives to kill people, destroy public and priv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64G06T7/90G06Q50/26
CPCG01N21/6428G06T7/90G06Q50/26G06T2207/10064
Inventor 黄锐马玉瑶
Owner SOUTHWEST UNIVERSITY OF POLITICAL SCIENCE AND LAW