CN106037754B - A kind of method of the latent fingerprint of visual carburetion - Google Patents
A kind of method of the latent fingerprint of visual carburetion Download PDFInfo
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- CN106037754B CN106037754B CN201610363178.1A CN201610363178A CN106037754B CN 106037754 B CN106037754 B CN 106037754B CN 201610363178 A CN201610363178 A CN 201610363178A CN 106037754 B CN106037754 B CN 106037754B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/117—Identification of persons
- A61B5/1171—Identification of persons based on the shapes or appearances of their bodies or parts thereof
- A61B5/1172—Identification of persons based on the shapes or appearances of their bodies or parts thereof using fingerprinting
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Abstract
The invention discloses a kind of methods of the latent fingerprint of visual carburetion, belong to fingerprinting detection technique field.The NO probe solution of low concentration is uniformly sprayed onto object surface using supersonic spraying by the present invention, by ultraviolet excitation, it is made to generate Fluorescence fingerprint.The present invention using the method for absorption NO, carries out the latent fingerprint that develops for the first time, has widened the probe for detecting latent fingerprint significantly, and theoretically sensitive NO probe is used equally for extending the application range of NO probe using this kind of latent fingerprint of method detection oil.This method application object is extensive simultaneously, and high sensitivity is harmless to environment and operator, can save latent fingerprint for a long time.
Description
Technical field
The present invention relates to a kind of methods of the latent fingerprint of visual carburetion, belong to fingerprinting detection technique field.
Background technique
The finger of people, palmar aspect, sole skin on, there are a large amount of sweat gland and sebaceous glands, people carry out it is new old
Sweat, sebum liquid can constantly be discharged while metabolism.As long as therefore finger, palm contacts to body surface, will leave meat
The sightless mark of eye, referred to as latent fingerprint.It is mainly organized as a large amount of moisture, plurality of inorganic salt (such as villaumite, bromide, salt compounded of iodine,
Villiaumite and phosphate) and some organic matters (such as amino acid, sebum and urea), wherein the sebum of smegma has fat
Acid, wax ester, glyceride, squalene and cholesterol etc..
Fingerprint is widely used in searching criminal field, carries out identity approval due to its uniqueness and unchangeable property, so
Latent fingerprint is chemically or physically handled, making its visualization is the key that one step of scene of a crime evidence obtaining.
Extracting latent fingerprint mainly has three categories method: (1) physics appearance method, and such as sootiness appearance method, iodine is smoked to be shown and tradition
Powder method, vacuum metal deposition etc.；(2) chemical appearance method, such as silver nitrate method, ninhydrin method, DFO method；(3) optics shows
Method, if ordinary optical is examined, ultraviolet optical check, laser inspection, Raman is examined.However these methods are there is certain deficiencies,
For example the instrument of accurate valuableness is needed, cumbersome operating procedure or dicyandiamide solution, substance used can give testing staff and environment band
It injures, and undesirable.Therefore, still need to develop one kind simply, accurately, economical and effective and the method inspection general without destructiveness
Survey latent fingerprint.
Summary of the invention
The present invention provides a kind of method for visualizing latent fingerprint, and strong operability has a wide range of application, is easy in real case
Middle operation, it is easy, it is harmless, the dive detection of fingerprint and the detection of outmoded fingerprint are can be applied on a variety of objects.
The method be by fat soluble gas in conjunction with the grease in latent fingerprint, and by fat soluble gas probe to latent finger
Line is detected.
In one embodiment of the invention, by fat soluble gas probe, developer solution is configured to appropriate solvent, is used for
It develops the color to the latent fingerprint for having adsorbed fat soluble gas.
In one embodiment of the invention, it will be atomized atomized liquid containing the developer solution of fat soluble gas probe,
For developing the color to the latent fingerprint for having adsorbed fat soluble gas.
In one embodiment of the invention, the object for loading latent fingerprint is placed on fat-soluble body and seals room, make to dive
Fingerprint adsorbs fat soluble gas.
In one embodiment of the invention, fat soluble gas probe includes colour developing probe or fluorescence probe.
In one embodiment of the invention, the fat soluble gas is nitric oxide.
In one embodiment of the invention, it the described method comprises the following steps:
(1) by NO colour developing probe or fluorescence probe, developer solution is configured to appropriate solvent；
(2) object for being mounted with latent fingerprint is placed on NO air seal room, latent fingerprint is made sufficiently to adsorb NO gas；
(3) developer solution is atomized atomized liquid with ultrasonic atomizer, the object for being mounted with latent fingerprint is placed in containing mist
In the sealing device for changing liquid；
(4) object for being mounted with latent fingerprint take pictures and collect the visualization fluorescence photo of latent fingerprint.
In one embodiment of the invention, the colour developing probe in step (1) or fluorescence probe include: 1,2- diamino
Anthraquinone (DAQ), using rhodamine, fluorescein, two pyrroles of fluorine boron, cyanine dye as the series derivates of skeleton, Cu (II) complex compound,
The classics NO such as Fe (II) complex compound fluorescence probe, colour developing probe.
In one embodiment of the invention, solvent selected by step (1) preparing developer liquid is not limited to single
System and a certain concentration.
In one embodiment of the invention, step (1) with DAQ be NO fluorescence probe, with dimethyl sulfoxide or ethyl alcohol
The developer of 3-10mM is prepared for solvent.
In one embodiment of the invention, step (2) specifically includes NO gas and is sealing indoor preparation and releasing
It puts, it is made to contact 30min with the object for loading latent fingerprint.
In one embodiment of the invention, step (3) includes that the object for loading latent fingerprint is placed in the close of atomized liquid
1-3min is placed in seal apparatus.The specific time is adjusted with object substrate, spray concentration, fingerprint situation.
In one embodiment of the invention, step (4) claps object with the Chemiluminescence Apparatus for loading CCD camera
According to the visualization fluorescence photo for collecting latent fingerprint.
In one embodiment of the invention, in step (4) operation, according to Fig. 3, the fluorescence excitation-emission figure of DAQ-TZ
Spectrum selects the best filter (530nm) excited near similar blue-light source (460nm) and maximum fluorescence emission.
DAQ is reported no cytotoxicity, is reacted by the NO adsorbed with grease in fingerprint, and ring containing triazole is generated
Product (reaction equation such as Fig. 1), fluorescence intensity enhancing reaches more than ten times (see Fig. 2), this is swift in response and carries out at once, and DAQ pairs
The detection of NO is limited up to μM rank.
When fingerprint is exposed in air, residue lipid is unlikely to deteriorate and easy to maintain relative to amino acid and inorganic salts, because
This is extremely to have application prospect to outmoded latent fingerprint is detected using the lipid in fingerprint as test object.
NO is a kind of extraordinary fat soluble gas, can be dissolved in the lipid of the latent fingerprint of oil.After allowing fingerprint to adsorb NO, select
Sensitive NO probe can carry out the visualized operation of latent fingerprint.In order to keep operating method operability stronger, the present invention is selected
Spray-on process carries out the visualization of latent fingerprint；Tradition makes the latent visual detection means of fingerprint have ninhydrin molten using spray method
Liquid and iodine/benzoflavone atomization method etc., these substances and selected dicyandiamide solution will cause testing staff and environment
Injury, and droplets particles are big, obtained fingerprint image details is not very ideal.The method for selecting ultrasonic atomizatio carries out atomization behaviour
Make, the orientation pressure of generation swells liquid surface, cavitation occurs around the liquid level of protuberance, liquid molecule structure is beaten
It dissipates and generates little particle droplet and add any chemical reagents without heating or additionally.General spraying droplet partial size is up to 200-
600 μm, and the droplet that ultrasonic atomizatio obtains can reduce two orders of magnitude.In addition, ultrasonic atomizer utilizes the electronics higher-order of oscillation,
Frequency of oscillation is 1.7MHz or 2.4MHz, and more than the audibility range of people, the electronic frequency is to human body and animal fanout free region.
The present invention innovatively introduces NO probe in detecting fingerprint, and required instrument and equipment is simple and easy to get, and operating process is easy,
It can be used for on-site test, strong operability；Using fluorescence as signal, object surface will not be destroyed or damaged as the latent of evidence
Fingerprint；To environment and operator's nonhazardous；This external enwergy shows outmoded latent fingerprint.
Detailed description of the invention
The reaction equation of Fig. 1 DAQ and NO
Fig. 2 DAQ and DAQ reacted with excessive NO after fluorogram (concentration: 1000 μM；Solvent: DMSO)
The fluorescence excitation-emission of Fig. 3 DAQ-TZ normalizes figure
(for fluorescence photo as shown in column right in figure, left column is corresponding aluminium foil certainly to the fingerprint that Fig. 4 embodiment 1 obtains
The photo shot under right light)
Fig. 5 aluminium foil details in fingerprint image
Fluorescence fingerprint image that Fig. 6 visualized operation on different objects obtains (ABCDE object be respectively stainless steel,
Aluminium foil, ceramics, glass plate, polytetrafluoroethylene (PTFE))
(FG object is respectively aluminium foil and polytetrafluoroethyl-ne to the Fluorescence fingerprint image that Fig. 7 obtains outmoded fingerprint visualized operation
Alkene)
Fig. 8 is passed through the ethanol solution color contrast of the forward and backward 3mM DAQ of NO
Fig. 9 oil fingerprint of diving adsorbs the color contrast of DAQ and DAQ-TZ on polytetrafluoroethylene (PTFE) object (left column d and e is respectively
Absorption, unadsorbed NO oil dive fingerprint carry out DAQ it is spraying after image, right column correspond to place the figure that color change occurs after 2h
Picture)
Specific embodiment
Embodiment 1: the visualization for fingerprint of diving on aluminium foil
(1) preparation of latent fingerprint: will hand-wash after drying only, touch the bridge of the nose or forehead again with the strength pressing of appropriateness with finger tip
Aluminium foil surface and obtain oil latent fingerprint a, b, c.
(2) C of the DAQ of 3mM is prepared2H5OH solution.
(3) the aluminium foil a for loading latent fingerprint is placed in the sealing room of connecting conduit, the other end connection NO reaction of conduit
Room, NO gas is by 15mL 2M NaNO2With the H of 4mL 6M2SO4Reaction generates, and places 30min, sufficiently adsorbs NO gas.
(4) aluminium foil a and b that load latent fingerprint are placed in sealing room, entrance accesses the conduit of ultrasonic nebulizer.It is selected
Ultrasonic atomizer fog-supplying amount is stablized in 40-50mL/h, and droplet is evenly distributed on 1-3 μm.
(5) the DAQ ethanol solution of 3mM is placed in ultrasonic nebulizer, makes solution atomization, the droplet of atomization is by leading
Pipe enters the sealing room for placing aluminium foil, makes instrument work 3min.
(6) by aluminium foil a, b, c instrument is placed in the duty Xiang chemiluminescence integrated instrument camera bellows of Shanghai and takes pictures, and selects blue
From about 25.5cm, the fluorescence photo such as Fig. 4 for obtaining fingerprint is right for light source, 530nm filter, 900ms exposure, camera lens and sample interval
Shown in column, left column is the fingerprint image that corresponding aluminium foil is shot under natural light.
The fingerprint fluorescent image for carrying out the available more visible ground of DAQ spray development again by NO absorption, is amplified solution
The second level detailed structure that fingerprint can be obtained in analysis is as shown in Figure 5.And the fingerprint without the processing of this kind of method then cannot be clearly glimmering
Light image.
Referring to above-mentioned steps, in the state of flexibly variation spray time, solution level, respectively obtains and be in object
Stainless steel, aluminium foil is ceramic, glass plate, the Fluorescence fingerprint image (seeing Fig. 6 A, B, C, D, E respectively) on polytetrafluoroethylene (PTFE).
In addition, this kind of method can also visualize outmoded fingerprint.To the finger on the aluminium foil and polytetrafluoroethylene (PTFE) of placing 20 days
Line carries out the processing of above-mentioned steps, has also obtained the good Fluorescence fingerprint image (as shown in Figure 7) of quality.
Embodiment 2: the detection of grease absorption NO on latent fingerprint
DAQ also can be used as colorimetric probe, and the concentration of the nitrogen oxides such as detection NO, DAQ itself solution is aubergine, with nitrogen oxygen
Solution decolourization is filbert close to colourless after compound reaction.It is illustrated in figure 8 the ethanol solution of 3mM DAQ and is passed through solution after NO
The comparison of color.With reference to this colorimetric method, NO is adsorbed on latent fingerprint for detecting.
Such as each step operation of embodiment 1, the difference is that object is changed to polytetrafluoroethylene (PTFE), oil latent fingerprint d, e, d are obtained
NO absorption and e are carried out without the operation.After carrying out DAQ developer solution spray operation to d, e again, obtained fingerprint is under natural light
It is light aubergine (as shown in Figure 9), after 2h, d fingerprint fades in very filbert close to colourless, and e fingerprint is then color
Relatively deep aubergine.Here, we are using DAQ simultaneously but also as the principle of colorimetric probe, it was demonstrated that grease is to NO's
Absorption.
Although the present invention has been described by way of example and in terms of the preferred embodiments, it is not intended to limit the invention, any to be familiar with this skill
The people of art can do various change and modification, therefore protection model of the invention without departing from the spirit and scope of the present invention
Enclosing subject to the definition of the claims.
Claims (7)
1. a kind of method for detecting latent fingerprint, which is characterized in that by fat soluble gas in conjunction with the grease in latent fingerprint, and pass through
Fat soluble gas probe detects latent fingerprint；The fat soluble gas is nitric oxide；The fat soluble gas and latent finger
It is that the object for loading latent fingerprint is placed on to fat-soluble body sealing room that grease in line, which combines, and latent fingerprint is made to adsorb fat-soluble gas
Body；The fat soluble gas probe includes colour developing probe or fluorescence probe.
2. the method according to claim 1, wherein fat soluble gas probe is configured to show with appropriate solvent
Shadow liquid, for developing the color to the latent fingerprint for having adsorbed fat soluble gas.
3. according to the method described in claim 2, it is characterized in that, the developer solution containing fat soluble gas probe is atomized to obtain
Atomized liquid, for developing the color to the latent fingerprint for having adsorbed fat soluble gas.
4. the method according to claim 1, wherein NO probe includes 1,2- diamino-anthraquinone, with rhodamine, glimmering
Light element, two pyrroles of fluorine boron, the series derivates that cyanine dye is skeleton, Cu (II) complex compound, Fe (II) complex compound.
5. according to the method described in claim 4, it is characterized in that, the described method comprises the following steps:
(1) with 1,2- diamino-anthraquinone for NO fluorescence probe, the development of 3-10mM is prepared using dimethyl sulfoxide or ethyl alcohol as solvent
Liquid；
(2) object for being mounted with latent fingerprint is placed on NO air seal room, latent fingerprint is made sufficiently to adsorb NO gas；
(3) developer solution is atomized atomized liquid with ultrasonic atomizer, the object for loading latent fingerprint is placed in containing atomized liquid
In sealing device；
(4) object for being mounted with latent fingerprint take pictures and collect the visualization fluorescence photo of latent fingerprint.
6. a kind of for detecting the device of latent fingerprint, which is characterized in that including the sealing device containing NO gas, NO probe, refer to
Line imaging device.
7. according to claim 6 a kind of for detecting the device of latent fingerprint, which is characterized in that further include containing developer solution
The sealing device of atomized liquid.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610363178.1A CN106037754B (en) | 2016-05-27 | 2016-05-27 | A kind of method of the latent fingerprint of visual carburetion |
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| CN201610363178.1A CN106037754B (en) | 2016-05-27 | 2016-05-27 | A kind of method of the latent fingerprint of visual carburetion |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108503849A (en) * | 2018-03-15 | 2018-09-07 | 北京化工大学 | A method of detecting fingerprint with fluorescence probe |
| CN116400068B (en) * | 2023-02-13 | 2023-09-22 | 泉州圣源警用侦察设备有限公司 | Reagent for revealing potential biological trace containing DNA and revealing method |
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| US7503962B2 (en) * | 2005-12-16 | 2009-03-17 | Attar Amir J | End of service and residual life indicator |
| US20080166792A1 (en) * | 2007-01-05 | 2008-07-10 | Attar Amir J | Detection of analytes in materials liquids using capillary colorimetric detection |
| US20100310755A1 (en) * | 2009-06-04 | 2010-12-09 | Appealing Products, Inc. | Ultra-sensitive detection of faint fingerprints on rough surfaces and corresponding fingerprint detection kit |
| CN103070691B (en) * | 2012-11-09 | 2014-11-05 | 哈尔滨师范大学 | Method for manifesting latent fingerprints on basis of fluorescent gold nanoclusters |
| CN103356199A (en) * | 2013-07-19 | 2013-10-23 | 北京科技大学 | Method for manifesting metal surface hidden fingerprints through chemical sedimentation |
| CN103800015B (en) * | 2014-02-21 | 2015-08-12 | 北京科技大学 | The method of aobvious laten fingerprints smoked by a kind of wax candle flue dust |
| CN104337522B (en) * | 2014-11-24 | 2017-01-11 | 中国刑事警察学院 | Method for displaying latent fingerprints by adopting fluorescent dye-modified nano particles |
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