High-resolution latent blood fingerprint image collecting method based on scanning electrochemical microscope (SECM)

A scanning electrochemical and image acquisition technology, applied in the field of fingerprint identification, can solve the problems that have not been reported, and achieve the effects of less damage to health, high resolution, and stable reagents

Inactive Publication Date: 2014-02-26
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the application of scanning electrochemical microscopy in high-resolution image acquisition of blood latent fingerprints has not been reported so far.

Method used

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  • High-resolution latent blood fingerprint image collecting method based on scanning electrochemical microscope (SECM)
  • High-resolution latent blood fingerprint image collecting method based on scanning electrochemical microscope (SECM)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Taking blood fingerprint detection on the surface of semi-permeable substrate polyvinylidene fluoride (PVDF) as an example, the specific operation has the following steps:

[0043] (1) Dissolve 1.25g of sodium carbonate, transfer it to a 25mL volumetric flask, and dilute to volume with ultrapure water, called stock solution A.

[0044] (2) Dissolve 0.05g of ammonium nitrate, 0.05g of silver nitrate, 0.25g of silicotungstic acid, and 125μL of formaldehyde in a small beaker, transfer to a 25mL volumetric flask, and dilute to volume with ultrapure water, called stock solution B.

[0045] (3) The PVDF membrane is first soaked in methanol for 1-2 seconds, and then soaked in water for 1-2 minutes. The membrane body must be kept moist before pressing fingerprints.

[0046] (4) Volunteers wash their hands with soap, dry them, dip their fingers in the whole blood of a healthy human body, wipe off the excess blood on the palm of the other hand, spread it evenly, and press it on t...

Embodiment 2

[0054] Taking blood fingerprint detection on the surface of a semi-permeable substrate polyethylene phthalate (PET) as an example, the specific operation has the following steps:

[0055] (1) Dissolve 1.25g of sodium carbonate, transfer it to a 25mL volumetric flask, and dilute to volume with ultrapure water, called stock solution A.

[0056] (2) Dissolve 0.05g of ammonium nitrate, 0.05g of silver nitrate, 0.25g of silicotungstic acid, and 125μL of formaldehyde in a small beaker, transfer to a 25mL volumetric flask, and dilute to volume with ultrapure water, called stock solution B.

[0057] (3) PET was ultrasonically cleaned in ethanol and water for 15 minutes, and dried with nitrogen.

[0058] (4) Volunteers washed their hands with soap, dried them, dipped their fingers in the whole blood of a healthy human body, wiped off the excess blood in the palm of the other hand, spread it evenly, and pressed it on the PET with moderate strength to obtain Fresh blood fingerprints.

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Abstract

The invention relates to a method for using a scanning electrochemical microscope (SECM) in coordination with silver staining to collect latent blood fingerprint image in a high-resolution way and belongs to the technical field of fingerprint identification. The method includes: using the principle that Ag+ ions combines with protein components in the blood of the ridge line are of a fingerprint and is reduced to Ag nano particles with electrochemical activity instead of reacting with the substrate in the valley line area to allow the fingerprint ridge line area and the fingerprint valley line area to form electrochemical activity difference; adding redox medium K3IrCl6 to solution, using the principle that the K3IrCl6 reacts with the Ag metal particles in the ridge line area to generate positive feedback effect instead of reacting with the valley line area to perform blood finger print collection based on SECM. The method has the advantages that image resolution is high, third-level fingerprint information can be collected, and the ideal latent blood fingerprint high-resolution image collecting method is promising in application prospect in the field of fingerprint identification.

Description

technical field [0001] The invention relates to a method for collecting blood latent fingerprint images with high resolution by combining scanning electrochemical microscopy (SECM) and silver staining technology, and belongs to the technical field of fingerprint identification. Background technique [0002] In major vicious cases such as homicide and robbery, bloody fingerprints are often left on the scene. Effective fingerprint display and image collection can provide important clues and strong evidence for the detection of the case. Therefore, it is very important to find and extract blood fingerprints at crime scenes. Blood fingerprints are usually divided into two categories: one is visible blood fingerprints, which refer to fingerprints that are clearly visible due to the large contrast between the deep red blood lines and the background background; the other is latent blood fingerprints, which refer to fingerprints containing Faint or indistinct fingerprints with litt...

Claims

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Application Information

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IPC IPC(8): A61B5/117
Inventor 张学记武文锦张亭朱雨张美芹
Owner UNIV OF SCI & TECH BEIJING
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