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Method for showing latent fingerprint, and develop system

A fingerprint, a potential technology, applied in chemical instruments and methods, measuring devices, material analysis through optical means, etc., can solve the problems of low-energy radioactivity of uranyl zinc acetate, interference with fingerprint fluorescence, fingerprints are not easy to show, etc., to achieve retention time Long, strong fluorescent effect, and simple equipment

Inactive Publication Date: 2007-07-25
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main disadvantage of the fluorescamine visualization method is that it is not easy to use this method if the fluorescence of the test material is very strong and interferes with the fluorescence of the fingerprint. The fluorescence of the fingerprints only lasts for 2-3 days, so you should take pictures in time after the fingerprints appear
[0005] Uranyl zinc acetate visualization method, its main disadvantages: uranyl zinc acetate has low-energy radioactivity, it is necessary to wear a gas mask and rubber gloves during the preparation and use of the solution
[0006] The main disadvantage of the phthalaldehyde visualization method: under strong light and humid conditions, the fluorescence may disappear within tens of minutes
[0008] The use of fluorescent nanoparticles to visualize fingerprints is still in its infancy

Method used

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  • Method for showing latent fingerprint, and develop system
  • Method for showing latent fingerprint, and develop system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The first step is to manufacture and synthesize the red CdTe fluorescent nanoparticle solution. The chemical reaction equation followed by the selected raw materials is:

[0039] a) Te+NaBH 4 +H 2 O→NaHTe+Na 2 B 4 o 7 +H 2 ↑

[0040] b) NaHTe+CdCl 2 →CdTe+NaCl

[0041] Dissolve 29 mg of CdCl in a three-neck flask 2 2.5H 2 0 and 25 μl of thioglycolic acid in 100 ml of water, adjust the pH value to 11 with NaOH, pass argon gas through the mouth of the three-necked flask side, and evacuate the air in the three-necked flask. Add 50mg NaBH to another reaction vial 4 and 26mg of tellurium powder, reacted for 2-3 hours under stirring, and then poured it into a three-necked flask. Then pour the mixed aqueous solution in the three-neck flask into a quartz microwave reaction tube, program the temperature to 80° C., and continue heating for 120 minutes to obtain a red fluorescent nanoparticle solution.

[0042] In the second step, take the aluminum foil with potential ...

Embodiment 2

[0047] The first step is to manufacture and synthesize the yellow CdTe fluorescent nanoparticle solution. The chemical reaction equation followed by the selected raw materials is:

[0048] a) Te+NaBH 4 +H 2 O→NaHTe+Na 2 B 4 o 7 +H 2 ↑

[0049] b) NaHTe+CdCl 2 →CdTe+NaCl

[0050] Dissolve 29 mg of CdCl in a three-neck flask 2 2.5H 2 0 and 25 μl of thioglycolic acid in 100ml of water, adjust the pH to 11 with NaOH, pass argon gas through the mouth of the three-necked flask side, and empty the air in the three-necked flask. Add 50mg NaBH to another reaction vial 4 and 26mg of tellurium powder, reacted for 2-3 hours under stirring, and then poured it into a three-necked flask. Then pour the mixed aqueous solution in the three-necked flask into a quartz microwave reaction tube, program the temperature to 80° C., and continue heating for 30 minutes to obtain a yellow fluorescent nanoparticle solution.

[0051] In the second step, take the glass with potential fingerprint...

Embodiment 3

[0056] The first step is to manufacture and synthesize the red CdTe fluorescent nanoparticle solution. This step is the same as the first step in Example 1 and will not be repeated here.

[0057] In the second step, take the plastic beverage bottle with potential fingerprints and place it, and inject the CdTe red fluorescent nanoparticle solution synthesized in the first step into container 1, the air inlet of the D-type ICP glass high-efficiency atomizer Connect the gas outlet of the argon cylinder 2 with a plastic tube, and connect the inlet of the D-type ICP glass high-efficiency atomizer 3 with the outlet of the container 1 containing the CdTe red fluorescent nanoparticle solution with a plastic tube, and adjust the argon gas to enter According to the air intake of D-type ICP glass high-efficiency nebulizer 3 and the distance between D-type ICP glass high-efficiency nebulizer and the plastic beverage bottle with potential fingerprints, turn on the argon gas switch, and pass...

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Abstract

A method for visualizing hidden fingerprint includes preparing CdTe fluorescent nanoparticles, using glass atomizer to spray nanoparticles solution onto fingerprint carrier surface carried with fingerprint, using cyanoacylate to stream surface of fingerprint carrier to form reinforced film of fingerprint and using ultraviolet ray fluorescent photograph means to obtain fluorescent fingerprint image. The visualizing system used for realizing said method is also disclosed.

Description

technical field [0001] The invention relates to a method for displaying latent fingerprints in criminal investigation work. The invention also relates to a visualization system implementing this method. Background technique [0002] In recent years, under the research of forensic researchers, fingerprint visualization technology has made some progress, especially a number of achievements in fluorescence visualization technology, which effectively solved the problems in conventional visualization methods and made fingerprint visualization technology further advanced. perfectly. Using certain chemical reagents to chemically react with inorganic or organic substances in sweat fingerprints to generate a fluorescent substance, which can appear as fluorescent fingerprints under ultraviolet light. This display method is called chemical reaction fluorescence display method. [0003] The main current fluorescence display methods and their existing problems are listed below: [000...

Claims

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Application Information

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IPC IPC(8): G01N21/84G01N21/64C09K11/88
Inventor 周建光黄校亮刘岩许晓宇于东冬金丽杨莹丽范宏亮张磊赵晓丽
Owner JILIN UNIV
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