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Fingerprint showing method for permeable object with crude surface

A permeable, rough surface technology, applied in the direction of human identification, etc., can solve the problem of not being able to obtain fingerprints

Active Publication Date: 2015-05-13
SUZHOU XIAOSONG TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, although there have been reports on the use of nindione to display fingerprints, none of the methods in the reports can obtain bricks, wooden sticks, fabrics, leather handprint on

Method used

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  • Fingerprint showing method for permeable object with crude surface
  • Fingerprint showing method for permeable object with crude surface
  • Fingerprint showing method for permeable object with crude surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1 (the sample is a brick with fingerprints)

[0031] (1) Control the moisture content of bricks to 7% by drying;

[0032] (2) Mix 1.0g glacial acetic acid and 9.0g ethyl acetate thoroughly at 25°C and 60% relative humidity; then add 0.12g indanedione, fully stir to dissolve, then add 89.88g petroleum ether , fully stirred and dissolved, and prepared as a fluorescent agent. The fluorescent agent is prepared and used immediately. If it needs to be stored, it should be stored in a brown light-proof bottle at 4°C and should be used up within 2 weeks;

[0033] (3) Soak the bricks in the fluorescent agent for 10 seconds;

[0034] (4) Dry the soaked bricks at ambient room temperature (25°C) and put them in an environment with a relative humidity of 30% and a temperature of 120°C for 10 minutes;

[0035] (5) Irradiate the dried bricks with a laser with a wavelength of 532 nanometers and a spectral half-maximum width of less than 1 nanometer, and control the...

Embodiment 2

[0036] Example 2 (sample is wood with fingerprints)

[0037] (1) Control the moisture content of wood to 7% by drying;

[0038] (2) Mix 1.0g glacial acetic acid and 9.0g ethyl acetate thoroughly at 25°C and 60% relative humidity; then add 0.15g indanedione, fully stir to dissolve, then add 88.5g petroleum ether , fully stirred and dissolved, and prepared as a fluorescent agent. The fluorescent agent is prepared and used immediately. If it needs to be stored, it should be stored in a brown light-proof bottle at 4°C and should be used up within 2 weeks;

[0039] (3) Soak the wood with fingerprints in the fluorescent agent for 10 seconds;

[0040] (4) Dry the soaked wood at ambient room temperature (25°C) and put it in an environment with a relative humidity of 30% and a temperature of 100°C for 15 minutes;

[0041] (5) Irradiate the dried wood with a laser with a wavelength of 532 nanometers and a spectral half-height width of less than 1 nanometer, and control the ...

Embodiment 3

[0042] Example 3 (the sample is a fabric with fingerprints)

[0043] (1) Control the moisture content of the fabric to 7% by drying;

[0044] (2) Mix 1.0g glacial acetic acid and 9.0g ethyl acetate thoroughly at 25°C and 60% relative humidity; then add 0.1g indanedione, stir well to dissolve, then add 89.9g petroleum ether , fully stirred and dissolved, and prepared as a fluorescent agent. The fluorescent agent is prepared and used immediately. If it needs to be stored, it should be stored in a brown light-proof bottle at 4°C and should be used up within 2 weeks;

[0045] (3) Soak the bricks in the fluorescent agent for 10 seconds;

[0046] (4) Dry the soaked bricks at ambient room temperature (25°C) and put them in an environment with a relative humidity of 30% and a temperature of 80°C for 20 minutes;

[0047] (5) Irradiate the dried bricks with a laser with a wavelength of 532 nanometers and a spectral half-maximum width of less than 1 nanometer, and control th...

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Abstract

The invention relates to a fingerprint showing method for a permeable object with a crude surface. The method comprises the following steps: soaking or spraying the permeable object with the crude surface with a fluorescent appearing agent, controlling the reacting time to 5 sec-15 sec, and then, drying the permeable object with the crude surface for 5-30 min in the environment that the relative humidity is smaller than 40% and the temperature is 50-120 DEG C, illuminating the dried permeable object with the crude surface with lasers of which the wave lengths are 532 nanometers and the half height width of spectrums is smaller than 1 nanometer, and controlling the illumination to form illuminance exceeding 500 thousand lux on the surface of the permeable object with the crude surface. According to the fingerprint showing method disclosed by invention, the proportion of the formula of the fluorescent appearing agent is adjusted, and the reacting temperature, the drying condition, and the lasers for illumination are adjusted, so that the fingerprint showing method disclosed by the invention can show fingerprints on the surface of the permeable object with the crude surface.

Description

technical field [0001] The invention relates to a fingerprint display method on a rough surface permeable object. Background technique [0002] In the field of criminal evidence investigation, it is necessary to discover and obtain criminal evidence left by suspects, including fingerprint evidence, palm print evidence, and trace evidence that can reflect DNA characteristics, so as to build a criminal evidence chain and lay a legal evidence foundation for punishing crimes . [0003] However, in the field of professional criminal technology, it is difficult to find fingerprints on bricks, wooden sticks, fabrics, leather, etc., and bricks, wooden sticks, etc. are common criminal evidence in our country. Therefore, if fingerprints can be found on bricks, sticks, and clothing, it will be of great significance to the detection of the case. [0004] In the prior art, although there have been reports of using indandione to display fingerprints, none of the reported methods can obt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/117
CPCA61B5/117
Inventor 胡晓松
Owner SUZHOU XIAOSONG TECH DEV
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