CN106037754A - Method for visualizing sebum latent fingerprints - Google Patents
Method for visualizing sebum latent fingerprints Download PDFInfo
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- CN106037754A CN106037754A CN201610363178.1A CN201610363178A CN106037754A CN 106037754 A CN106037754 A CN 106037754A CN 201610363178 A CN201610363178 A CN 201610363178A CN 106037754 A CN106037754 A CN 106037754A
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- latent fingerprint
- fingerprint
- fat soluble
- probe
- soluble gas
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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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- Heart & Thoracic Surgery (AREA)
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- Animal Behavior & Ethology (AREA)
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- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
The invention discloses a method for visualizing sebum latent fingerprints, belonging to the technical field of fingerprint detection. According to the method, an NO probe solution with low concentration is uniformly sprayed to the surface of an object by adopting an ultrasonic spraying method, and the fluorescent fingerprints are generated through the ultraviolet excitation. According to the method, the NO adsorption method is adopted for the first time for imaging the latent fingerprints, the range of probes for detecting the latent fingerprints is greatly expanded, in the theory, all the sensitive NO probes can be used for detecting the sebum latent fingerprints by adopting the method, and thus the application range of the NO probes is expanded. Meanwhile, the method can be widely applied to various objects, is high in sensitivity and free of damage to the environment and injuries to operators, and the latent fingerprints can be preserved for a long time.
Description
Technical field
The present invention relates to a kind of visual carburetion dive the method for fingerprint, belong to fingerprinting detection technique field.
Background technology
The finger of people, palmar aspect, sole skin on, there are substantial amounts of sweat gland and sebaceous gland, people carry out the oldest
Perspiration, sebum liquid can be constantly discharged while metabolism.As long as therefore finger, palm contacts are to body surface, meat will be left
The sightless impression of eye, is referred to as latent fingerprint.It mainly comprises as substantial amounts of moisture, plurality of inorganic salt (such as villaumite, bromide, iodine salt,
Villiaumite and phosphate), and some Organic substances (such as aminoacid, sebum and carbamide), wherein the sebum of smegma has fat
Acid, wax ester, glyceride, Squalene and cholesterol etc..
Fingerprint, due to its uniqueness and unchangeable property, is widely used in searching criminal field, carries out identity approval, so
Latent fingerprint is chemically or physically processed so that it is visualization is key one step of scene of a crime evidence obtaining.
Extract latent fingerprint and mainly have three major types method: (1) physics appearance method, such as sootiness appearance method, iodine is smoked to be manifested and tradition
Powder method, vacuum metal deposition etc.；(2) chemistry appearance method, such as silver nitrate method, ninhydrin method, DFO method etc.；(3) optics manifests
Method, such as ordinary optical inspection, ultraviolet light inspection, laser inspection, Raman is checked.But these methods all also exist some deficiency,
Than if desired for accurate expensive instrument, loaded down with trivial details operating procedure or dicyandiamide solution, material used can give testing staff and environment band
Injure, and inadvisable.Therefore, still need to development a kind of simple, accurately, economical and effective and do not have destructive general method inspection
Survey latent fingerprint.
Summary of the invention
The present invention provides a kind of method visualizing latent fingerprint, workable, applied range, it is easy in real case
Middle operation, easy, harmless, can be applicable to detection and the detection of outmoded fingerprint of latent fingerprint on multiple object.
Described method is to be combined by fat soluble gas oils and fats in latent fingerprint, and by fat soluble gas probe to latent finger
Stricture of vagina detects.
In one embodiment of the invention, by fat soluble gas probe, it is configured to developer solution with appropriate solvent, is used for
The latent fingerprint having adsorbed fat soluble gas is developed the color.
In one embodiment of the invention, the developer solution containing fat soluble gas probe is atomized atomized liquid,
For the latent fingerprint having adsorbed fat soluble gas is developed the color.
In one embodiment of the invention, the object loading latent fingerprint is placed on liposoluble gonosome closed chamber, makes to dive
Fingerprint absorption fat soluble gas.
In one embodiment of the invention, fat soluble gas probe includes develop the color probe or fluorescent probe.
In one embodiment of the invention, described fat soluble gas is nitric oxide.
In one embodiment of the invention, said method comprising the steps of:
(1) develop the color probe or fluorescent probe by NO, is configured to developer solution with appropriate solvent；
(2) object that will be loaded with latent fingerprint is placed on NO air seal room, makes latent fingerprint fully adsorb NO gas；
(3) with ultrasound atomizer, developer solution being atomized atomized liquid, the object that will be loaded with latent fingerprint is placed in containing mist
Change in the sealing device of liquid；
(4) object being mounted with latent fingerprint is taken pictures collect the visualization fluorescence photo of latent fingerprint.
In one embodiment of the invention, the colour developing probe in step (1) or fluorescent probe include: 1,2-diaminourea
Anthraquinone (DAQ), with rhodamine, fluorescein, fluorine boron two pyrroles, the cyanine dye series derivates as skeleton, Cu (II) complex,
The classical NO fluorescent probe such as Fe (II) complex, colour developing probe.
In one embodiment of the invention, the 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) is with DAQ for NO fluorescent probe, with dimethyl sulfoxide or ethanol
Developing agent for solvent preparation 3-10mM.
In one embodiment of the invention, step (2) specifically includes NO gas and in the preparation in closed chamber and releases
Put so that it is contact 30min with the object loading latent fingerprint.
In one embodiment of the invention, step (3) includes the object loading latent fingerprint is placed in the close of atomized liquid
Seal apparatus is placed 1-3min.The concrete time is adjusted with object base material, spray concentration, fingerprint situation.
In one embodiment of the invention, object is clapped by step (4) with the Chemiluminescence Apparatus loading CCD camera
According to the visualization fluorescence photo collecting latent fingerprint.
In one embodiment of the invention, in step (4) operation, according to the fluorescence excitation-emission figure of Fig. 3, DAQ-TZ
Spectrum, selects most preferably to excite the filter (530nm) near close blue-light source (460nm) and maximum fluorescence emission.
DAQ is not had cytotoxicity by report, by reacting with the NO of oils and fats absorption in fingerprint, generates the ring Han triazole
Product (reaction equation such as Fig. 1), fluorescence intensity strengthens and reaches tens times (see Fig. 2), and this is swift in response and at once carries out, and DAQ pair
The detection of NO limits up to a μM rank.
When fingerprint is exposed in air, residue lipid, relative to aminoacid and inorganic salt, is unlikely to deteriorate and easily preserves, because of
This is extremely to have application prospect with the lipid in fingerprint for detecting object to detecting outmoded latent fingerprint.
NO is a kind of extraordinary fat soluble gas, can be dissolved in the lipid of the latent fingerprint of oil.Allow after fingerprint absorption NO, select
Sensitive NO probe, can carry out the visualized operation of latent fingerprint.In order to make operational approach operability higher, the present invention selects
Nebulization carries out the visualization of latent fingerprint；Tradition application spray method makes the latent visual detection means of fingerprint have 1,2,3-indantrione monohydrate molten
Liquid and iodine/benzoflavone atomization method etc., testing staff and environment can be caused by these materials and selected dicyandiamide solution
Injury, and droplet granule is big, the fingerprint image details obtained is the most very good.The method selecting ultrasonic atomizatio carries out atomization behaviour
Making, the orientation pressure of generation makes liquid surface swell, and cavitation occurs around the liquid level of protuberance, liquid molecule structure is beaten
Dissipate and produce little granule droplet without heating or any chemical reagent of extra interpolation.General spraying droplet particle diameter is up to 200-
600 μm, and the droplet that ultrasonic atomizatio obtains can reduce two orders of magnitude.Additionally, ultrasound atomizer utilizes the electronics higher-order of oscillation,
Frequency of oscillation is 1.7MHz or 2.4MHz, exceedes the range of audibility of people, and this electronic frequency is to human body and animal fanout free region.
The present invention introduces NO probe in detecting fingerprint innovatively, and required instrument and equipment is simple and easy to get, and operating process is easy,
Can be used for Site Detection, workable；Use fluorescence as signal, object surface will not be destroyed or damage diving as evidence
Fingerprint；To environment and operator's nonhazardous；Outmoded latent fingerprint is manifested by this external enwergy.
Accompanying drawing explanation
The reaction equation of Fig. 1 DAQ Yu NO
Fig. 2 DAQ and DAQ and the reacted fluorogram of excessive NO (concentration: 1000 μMs；Solvent: DMSO)
The fluorescence excitation-emission normalization figure of Fig. 3 DAQ-TZ
(as shown in row right in figure, left column is that corresponding aluminium foil is certainly to fluorescence photo to the fingerprint that Fig. 4 embodiment 1 obtains
So photo of shooting under light)
Fig. 5 aluminium foil details in fingerprint image
What Fig. 6 visualized operation on different objects obtained Fluorescence fingerprint image (ABCDE object be respectively rustless steel,
Aluminium foil, pottery, glass plate, politef)
(FG object is respectively aluminium foil and polytetrafluoroethyl-ne to the Fluorescence fingerprint image that outmoded fingerprint visualized operation is obtained by Fig. 7
Alkene)
Fig. 8 is passed through the ethanol solution color contrast of 3mM DAQ forward and backward for NO
Fig. 9 oil dive fingerprint adsorb on politef object DAQ and DAQ-TZ color contrast (left column d and e be respectively
Absorption, the oil of unadsorbed NO fingerprint of diving carries out the image after DAQ spraying, and right row occur the figure of color change after corresponding to place 2h
Picture)
Detailed description of the invention
Embodiment 1: the visualization of latent fingerprint on aluminium foil
(1) preparation of latent fingerprint: after hand washing only being dried, touches the bridge of the nose or forehead again with the strength pressing of appropriateness with finger tip
Aluminium foil surface and obtain the latent fingerprint a of oil, b, c.
(2) C of the DAQ of preparation 3mM2H5OH solution.
(3) being positioned in the closed chamber connecting conduit by the aluminium foil a loading latent fingerprint, the other end of conduit connects NO reaction
Room, NO gas is by 15mL 2M NaNO2H with 4mL 6M2SO4Reaction generates, and places 30min, fully absorption NO gas.
(4) being positioned in closed chamber by aluminium foil a and b loading latent fingerprint, entrance accesses the conduit of ultrasonic nebulizer.Selected
Ultrasound atomizer fog-supplying amount stable at 40-50mL/h, droplet is evenly distributed on 1-3 μm.
(5) being positioned in ultrasonic nebulizer by the DAQ ethanol solution of 3mM, make solution atomization, the droplet of atomization is by leading
Pipe enters the closed chamber placing aluminium foil, makes instrument work 3min.
(6) by aluminium foil a, b, c instrument is positioned in the duty Xiang chemiluminescence integrated instrument camera bellows of Shanghai and takes pictures, and selects blueness
Light source, 530nm filter, 900ms exposes, and camera lens and sample interval are from about 25.5cm, and the fluorescence photo such as Fig. 4 obtaining fingerprint is right
Shown in row, left column is corresponding aluminium foil fingerprint image of shooting under natural light.
Carry out DAQ spray development again through NO absorption and can obtain the fingerprint fluorescent image on more visible ground, amplified solution
Two grades of detailed structure of the available fingerprint of analysis are as shown in Figure 5.The fingerprint processed without this kind of method then can not get the most glimmering
Light image.
With reference to above-mentioned steps, when changing spray time, solution level flexibly, respectively obtain and at object be
Rustless steel, aluminium foil, pottery, glass plate, the Fluorescence fingerprint image (seeing Fig. 6 A, B, C, D, E respectively) on politef.
Additionally, this kind of method can also visualize outmoded fingerprint.To the finger on the placement aluminium foil of 20 days and politef
Stricture of vagina carries out the process of above-mentioned steps, have also been obtained the Fluorescence fingerprint image (as shown in Figure 7) that quality is good.
Embodiment 2: the detection of oils and fats absorption NO on latent fingerprint
DAQ also as colorimetric probe, can detect the concentration of the nitrogen oxides such as NO, and DAQ self solution is aubergine, with nitrogen oxygen
After compound reaction, solution decolourization is filbert close to colourless.It is illustrated in figure 8 the ethanol solution of 3mM DAQ and is passed through solution after NO
The contrast of color.With reference to this colorimetric method, it is used for detecting on latent fingerprint absorption NO.
Respectively walking operation such as embodiment 1, except for the difference that object is replaced by politef, obtains oil latent fingerprint d, e, d
Carry out NO absorption and e does not carry out this operation.After again d, e being carried out DAQ developer solution spray operation, the fingerprint obtained is under natural light
Being light aubergine (as shown in Figure 9), after 2h, d fingerprint fades in the most filbert close to colourless, and e fingerprint is then color
The deepest aubergine.Here, we utilize the DAQ simultaneously again can be as the principle of colorimetric probe, it was demonstrated that oils and fats is to NO's
Absorption.
Although the present invention is open the most as above with preferred embodiment, but it is not limited to the present invention, any is familiar with this skill
The people of art, without departing from the spirit and scope of the present invention, can do various changes and modification, therefore the protection model of the present invention
Enclosing should be with being as the criterion that claims are defined.
Claims (10)
1. the method for the latent fingerprint of detection, it is characterised in that fat soluble gas oils and fats in latent fingerprint is combined, and passes through
Latent fingerprint is detected by fat soluble gas probe.
Method the most according to claim 1, it is characterised in that by fat soluble gas probe, be configured to show with appropriate solvent
Shadow liquid, for developing the color to the latent fingerprint having adsorbed fat soluble gas.
Method the most according to claim 2, it is characterised in that the developer solution containing fat soluble gas probe is atomized and obtains
Atomized liquid, for developing the color to the latent fingerprint having adsorbed fat soluble gas.
Method the most according to claim 1, it is characterised in that the object loading latent fingerprint is placed on liposoluble gonosome and seals
Room, makes latent fingerprint absorption fat soluble gas.
Method the most according to claim 1, it is characterised in that fat soluble gas probe includes develop the color probe or fluorescence spy
Pin.
6. according to the arbitrary described method of claim 1-5, it is characterised in that described fat soluble gas is nitric oxide.
Method the most according to claim 6, it is characterised in that NO probe includes 1,2-diamino-anthraquinone, with rhodamine, glimmering
Light element, fluorine boron two pyrroles, cyanine dye are the series derivates of skeleton, Cu (II) complex, Fe (II) complex etc..
Method the most according to claim 7, it is characterised in that said method comprising the steps of:
(1) with 1,2-diamino-anthraquinone is NO fluorescent probe, the development being solvent preparation 3-10mM with dimethyl sulfoxide or ethanol
Liquid；
(2) object that will be loaded with latent fingerprint is placed on NO air seal room, makes latent fingerprint fully adsorb NO gas；
(3) with ultrasound atomizer, developer solution is atomized atomized liquid, the object loading latent fingerprint is placed in containing atomized liquid
In sealing device；
(4) object being mounted with latent fingerprint is taken pictures collect the visualization fluorescence photo of latent fingerprint.
9. the device being used for detecting latent fingerprint, it is characterised in that include the sealing device containing NO gas, NO probe, refer to
Stricture of vagina imaging device.
A kind of device for detecting latent fingerprint the most according to claim 9, it is characterised in that also include containing development
The sealing device of liquid atomized liquid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610363178.1A CN106037754B (en) | 2016-05-27 | 2016-05-27 | A kind of method of the latent fingerprint of visual carburetion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| CN106037754A true CN106037754A (en) | 2016-10-26 |
| CN106037754B CN106037754B (en) | 2018-12-04 |
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| CN201610363178.1A Active CN106037754B (en) | 2016-05-27 | 2016-05-27 | A kind of method of the latent fingerprint of visual carburetion |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108503849A (en) * | 2018-03-15 | 2018-09-07 | 北京化工大学 | A method of detecting fingerprint with fluorescence probe |
| CN116400068A (en) * | 2023-02-13 | 2023-07-07 | 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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| 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 |
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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 |
| CN116400068A (en) * | 2023-02-13 | 2023-07-07 | 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 |
| 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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| CN106037754B (en) | 2018-12-04 |
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