CN101999901A - Fingerprint extracting equipment based on capillary X ray semitransparent mirror - Google Patents
Fingerprint extracting equipment based on capillary X ray semitransparent mirror Download PDFInfo
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- CN101999901A CN101999901A CN2010105994049A CN201010599404A CN101999901A CN 101999901 A CN101999901 A CN 101999901A CN 2010105994049 A CN2010105994049 A CN 2010105994049A CN 201010599404 A CN201010599404 A CN 201010599404A CN 101999901 A CN101999901 A CN 101999901A
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- pellicle mirror
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Abstract
The invention relates to fingerprint extracting equipment based on a capillary X ray semitransparent mirror, which comprises an X ray light source, the capillary X ray semitransparent mirror, a multi-capillary X ray collimator, an X ray detector and a bracket, wherein the core of the equipment is the capillary X ray semitransparent mirror and the multi-capillary X ray collimator; the capillary X ray semitransparent mirror is utilized to converge X rays emitted by a portable light source with low power so as to obtain an X ray beam spot with higher power density; the area of the X ray beam spot is larger than the area of an integral fingerprint; the beam spot is utilized to simultaneously excite the X ray fluorescence corresponding to the different position elements of the fingerprint; and the X ray fluorescence is reflected on the X ray detector after the collimation and the convergence with high space resolution through the multi-capillary X ray collimator so as to obtain the fingerprint. When the equipment is utilized to obtain the fingerprint, the point-to-point scanning analysis is not required on the fingerprint so as to shorten the time of obtaining the fingerprint and enhance the timeliness of obtaining the fingerprint.
Description
(1) technical field
The present invention relates to the fingerprint extraction technical field, particularly a kind of fingerprint extraction equipment based on the capillary X-ray pellicle mirror.
(2) background technology
The fingerprint extraction technology is constantly developing towards quick, the harmless and on-the-spot direction of extracting, pay special attention to following technology simultaneously: can also the fingerprint owner contacted what material before staying fingerprint when taking the fingerprint, because this is helpful to dwindling the criminal investigation scope.
The existing method that takes the fingerprint is as follows, if fingerprint is the surface of staying non-absorbent articles such as metal, plastics, glass, ceramic tile, this moment, the extraction ratio to fingerprint was easier to, and can use powder method and magnetic particle method or the like usually.If fingerprint is stayed the surface of absorbent articles such as paper, card, leather, wood, must just can show one's color through chemical treatment, the common chemical method has iodine fumigation, silver nitrate method, fluorometric reagent method etc.Existing above-mentioned fingerprint extraction method is difficult to accomplish judge the fingerprint owner contacted what material before staying fingerprint when taking the fingerprint, and, what have in these methods can only carry out at laboratory, can not be applied on the scene, the process that takes the fingerprint that has is too loaded down with trivial details, and precision is not high enough.
So how to take the fingerprint fast and accurately, can also judge that the fingerprint owner contacted what material before staying fingerprint is the problem that those skilled in the art need solve simultaneously in the scene of a crime.
(3) summary of the invention
The purpose of this invention is to provide a kind of fingerprint extraction equipment, be used for the extraction of scene of a crime fingerprint and judge the fingerprint owner contacted what material before staying fingerprint based on the capillary X-ray pellicle mirror.
For addressing the above problem, realize the foregoing invention purpose, in a kind of fingerprint extraction equipment based on the capillary X-ray pellicle mirror is provided, assemble the X-ray beam speckle that X ray that portable low power sources sends obtains higher power density with adopting the capillary X-ray pellicle mirror, the area of this bundle speckle is greater than the area of a complete finger print, utilize this bundle speckle to excite the XRF of the element correspondence of the fingerprint owner in the material that the fingerprint place stays as excitaton source, these XRFs are assembled the back by another one multiple capillary x-ray collimator again and are beaten on X-ray detector, utilizing these XRFs to carry out the XRF imaging on detector takes the fingerprint, because different material has different elementary composition, so the method that this kind utilizes the XRF imaging to take the fingerprint can also be judged the fingerprint owner contacted what material before staying fingerprint.
The scope of described fingerprint extraction gross weight of equipment amount based on the capillary X-ray pellicle mirror is 3kg-10kg.The gross weight of this equipment depends mainly on the weight of light source, and for example, adopting power is the light source of 2W, and the gross weight of this equipment is 3kg; Adopting power is the light source of 250W, and the gross weight of this equipment is 10kg; When the power of light source was 10W, the total amount of this equipment was 6kg, at this moment, because this kind equipment has made full use of the performance of capillary X-ray pellicle mirror, so that total amount is the spectrometer of 6kg is not only light but also have lower detection limit, was preferred equipment.
Described X ray light source is a low power sources, and power bracket is 2W-250W.If the content of element is the 10ppm magnitude in the fingerprint, then adopting power is the light source of 2W, if the content of element is higher than 200ppm in the fingerprint, then adopting power is the light source of 250W.
Described X ray light source is portable, and its weight range is 1kg-2kg.When the power of light source was 2W, its weight was 1kg, and when the power of light source was 250W, its weight was 2kg.
Described capillary X-ray pellicle mirror is to be made of ten thousand single capillary glass tubies of 40-80, the quantity of single capillary has determined the focused spot diameter and the power density gain (amplification) of capillary tube X-ray pellicle mirror, the arrival end of all single capillaries points to light source, and the port of export of all single capillaries is parallel.The arrangement mode of this kind single capillary determines the converging action of these lens to the X ray light beam dispersed.
The power density gain ranging of described capillary X-ray pellicle mirror bundle speckle position is 10-70.Under the situation of identical X ray light source, the gain of the power density at the focal spot position place of capillary tube X-ray pellicle mirror is big more, and the efficient of utilizing capillary tube X-ray pellicle mirror to take the fingerprint is high more.The single capillary quantity that constitutes capillary tube X-ray pellicle mirror is 40 o'clock, and the power density gain at the focal spot position place of capillary tube X-ray collecting lens is 10; The single capillary quantity that constitutes capillary tube X-ray pellicle mirror is 70 o'clock, and the power density gain at the focal spot position place of capillary tube X-ray pellicle mirror is 70.
The length range of described capillary X-ray pellicle mirror is that the scope of 80mm-200mm, inlet diameter is that the diameter that 5mm-15mm, outlet diameter are 40mm, the scope of the focal length that enters the mouth is 20mm-100mm, cross section maximum is 40mm.When the length of capillary X-ray pellicle mirror was 80mm, its inlet diameter was that 5mm, outlet diameter are that 40mm, inlet focal length are that the diameter of 20mm, cross section maximum is 40mm; When the length of capillary tube X-ray collecting lens was 200mm, inlet diameter was that 15mm, outlet diameter are that 40mm, inlet focal length are that the diameter of 100mm, cross section maximum is 100mm.
Described multiple capillary x-ray collimator is the cylinder that is made of ten thousand single capillary glass tubies of 60-80, and the quantity of single capillary has determined the power density gain of multiple capillary x-ray collimator.All single capillaries are parallel to each other.The arrangement mode of this kind single capillary has determined this multiple capillary x-ray collimator the X ray of dispersing to be collimated and assemble.
Described multiple capillary x-ray collimator cross-sectional diameter is 40mm, and this cross-sectional diameter value is by the decision of fingerprint size.
The length range of described multiple capillary x-ray collimator is 40mm-300mm.Preferably, the length of capillary X-ray collimator is 120mm, and this moment is easy to use.
The power density gain ranging of the bundle speckle position behind the described multiple capillary x-ray collimator collimation is 3-10, the quantity of single capillary is 600,000 o'clock, the power density gain of multiple capillary x-ray collimator is 3, the quantity of single capillary is 800,000 o'clock, and the power density gain of multiple capillary x-ray collimator is 10.
Described X-ray detector is the X-ray detector of energy resolution and spatial discrimination simultaneously, the energy resolution scope of detector is 140eV-230eV, when the energy difference of the characteristic curve of different elements in the fingerprint during less than 240eV, adopting energy resolution is the detector of 140eV, when the energy difference of the characteristic curve of different elements in the fingerprint during greater than 240eV, adopting energy resolution is the detector of 230eV.The spatial discrimination scope of detector is 40 μ m-60 μ m, and preferably, the explanation of the space of detector is 45 μ m, and be convenient to take the fingerprint efficiently this moment.
The invention has the beneficial effects as follows, owing to adopted the capillary X-ray pellicle mirror of higher power density gain, so can utilize the low X ray light source of power to obtain the high excitation of X-rays source of power density, the XRF signal of element correspondence is assembled once more by the multiple capillary x-ray collimator again in the fingerprint that this excitaton source excites, so this spectrometer can adopt low power sources, thereby make whole spectrometer be of portable form, be convenient to take the fingerprint in the scene of a crime; This spectrometer has used the low power X-ray light source, so improved the coefficient safe in utilization of X ray spectrometer user; The multiple capillary x-ray collimator that adopts can have spatially resolved collimation and convergence to the XRF signal of element correspondence in the fingerprint, this is convenient to obtain the fingerprint of high-space resolution on X-ray detector, the X-ray detector that is adopted, both had spatial discrimination and also had energy resolution, so it when high-space resolution obtains fingerprint, can also judge the fingerprint owner contacted what material before staying fingerprint according to the character that the different material correspondence different XRFs; Because the bundle speckle of the capillary X-ray pellicle mirror that adopts is bigger, can utilize the bundle speckle of capillary X-ray pellicle mirror to shine whole fingerprint simultaneously, obtain the XRF of fingerprint place diverse location element correspondence simultaneously, do not need that fingerprint is carried out the point by point scanning analysis and just can obtain fingerprint, obtain the time of fingerprint so shortened, obtain the ageing of fingerprint thereby improved.
(4) description of drawings
Fig. 1 is based on the sketch map of the fingerprint extraction equipment of capillary X-ray pellicle mirror;
Fig. 2 is the sketch map of capillary X-ray pellicle mirror;
Fig. 3 is the cross sectional representation of capillary X-ray pellicle mirror;
Fig. 4 is the sketch map of multiple capillary x-ray collimator;
Fig. 5 is the cross sectional representation of multiple capillary x-ray collimator.
(5) specific embodiment
Referring to Fig. 1, fingerprint extraction equipment based on the capillary X-ray pellicle mirror contains X ray light source 1, capillary X-ray pellicle mirror 2, multiple capillary x-ray collimator 4, X-ray detector 5 and support 6, on X ray light source 1, capillary X-ray pellicle mirror 2, multiple capillary x-ray collimator 4, X-ray detector 5 fixed supports 6.The X ray that X ray light source 1 sends is converged to X-ray beam speckle 3 through the capillary X-ray pellicle mirror, this bundle speckle 3 is radiated at the XRF that the fingerprint place excites fingerprint place element correspondence, these fingerprints go out corresponding XRF and are surveyed by X-ray detector 5 by multiple capillary x-ray collimator 4 collimations with after assembling, carry out the XRF imaging analysis by computer analysis XRF signal, thereby obtain fingerprint.
Referring to Fig. 2, the arrival end diameter D of capillary X-ray pellicle mirror
InWith port of export diameter D
OutCompare, the former is less, this has guaranteed that these lens collect expeditiously from the diverging X-ray of light source, guaranteed also simultaneously that the X ray that will collect is converted into the bigger X-ray beam speckle of area, the cross section maximum of capillary X-ray pellicle mirror is port of export place, and this has determined the X-ray beam speckle that is come out by these lens to have large-size; Capillary X-ray pellicle mirror inlet focal length F
1Size depend on lens arrangement, usually, the lens volume is big more, inlet focal length F
1Big more; The lens volume is more little, inlet focal length F
1More little.The length l of capillary X-ray pellicle mirror is decided according to the material of lens, and usually, the atomic number that constitutes capillary X-ray pellicle mirror material is big more, and the length l of this capillary X-ray pellicle mirror is more little; The atomic number that constitutes capillary X-ray pellicle mirror material is more little, and the length l of this capillary X-ray pellicle mirror is big more.
Referring to Fig. 3, the every single capillary that constitutes the capillary X-ray pellicle mirror is circular, arrangement mode adopts the mode of arranging 6 other single capillaries around the every single capillary, and the space between the single capillary of this kind arrangement mode decision formation lens is little, thereby has improved the efficiency of transmission of lens.
Referring to Fig. 4, the diameter D of multiple capillary x-ray collimator 4 depends on the port of export diameter of capillary X-ray pellicle mirror, and the two is basic identical, and this has guaranteed that whole spectrometer has high spatial resolution.The length of multiple capillary x-ray collimator 4 depends on the material of lens, and usually, the atomic number of the material of formation collimator is big more, and the length of multiple capillary x-ray collimator 4 is more little; The atomic number of the material of formation collimator is more little, and the length of multiple capillary x-ray collimator 4 is big more.
Referring to Fig. 5, the every single capillary that constitutes multiple capillary x-ray collimator 4 is circular, and arrangement mode adopts the mode of arranging 6 other single capillaries around the every single capillary, and this kind arrangement mode has guaranteed the utilization rate of single capillary.
Provide the example based on the fingerprint extraction equipment of capillary X-ray pellicle mirror below: the fingerprint extraction gross weight of equipment amount based on the capillary X-ray pellicle mirror is 7kg, the X ray light source that adopts is a low-power copper target X ray light source, power is 12W, light source is portable, its weight is 1.6kg, the capillary X-ray pellicle mirror is to be made of 650,000 single capillary glass tubies, the arrival end of all single capillaries points to light source, the port of export of all single capillaries is parallel, the power density gain ranging of capillary X-ray pellicle mirror bundle speckle position is 64, the length of capillary X-ray pellicle mirror is 110mm, inlet diameter is 9mm, outlet diameter is 40mm, the inlet focal length is 64mm-100mm, the diameter of cross section maximum is 40mm, the multiple capillary x-ray collimator is the cylinder that is made of 700,000 single capillary glass tubies, all single capillaries are parallel to each other, multiple capillary x-ray collimator cross-sectional diameter is 40mm, the length of multiple capillary x-ray collimator is 63mm, the power density gain of the bundle speckle position behind the multiple capillary x-ray collimator collimation is 5, X-ray detector is the X-ray detector of energy resolution and spatial discrimination simultaneously, the energy resolution of detector is 170eV, and the spatial discrimination of detector is 54 μ m.
Claims (2)
1. fingerprint extraction equipment based on the capillary X-ray pellicle mirror, it comprises X ray light source, capillary tube X
Ray pellicle mirror, multiple capillary x-ray collimator, X-ray detector and support is characterized in that:
Described capillary X-ray pellicle mirror is to be made of ten thousand single capillary glass tubies of 40-80, and the arrival end of all single capillaries points to light source, and the port of export of all single capillaries is parallel;
The every single capillary that constitutes described capillary X-ray pellicle mirror is circular, and arrangement mode adopts the mode of arranging 6 other single capillaries around the every single capillary;
Power density gain (amplification) scope of described capillary X-ray pellicle mirror bundle speckle position is 10-70;
The arrival end diameter D of described capillary X-ray pellicle mirror
InWith port of export diameter D
OutCompare, the former is less, and the cross section maximum of pellicle mirror is the port of export; Capillary X-ray pellicle mirror inlet focal length F
1Size depend on lens arrangement, the lens volume is big more, inlet focal length F
1Big more; The length l of capillary X-ray pellicle mirror is decided according to the material of lens, and the atomic number of the material of formation lens is big more, and the length l of this capillary X-ray pellicle mirror is more little;
The length range of described capillary X-ray pellicle mirror is that the scope of 80mm-200mm, inlet diameter is that the diameter that 5mm-15mm, outlet diameter are 40mm, the scope of the focal length that enters the mouth is 20mm-100mm, cross section maximum is 40mm;
Described multiple capillary x-ray collimator is the cylinder that is made of ten thousand single capillary glass tubies of 60-80, and all single capillaries are parallel to each other, and arrangement mode adopts the mode of arranging 6 other single capillaries around the every single capillary;
Described multiple capillary x-ray collimator cross-sectional diameter is 40mm;
The length range of described multiple capillary x-ray collimator is 40mm-300mm;
The power density gain ranging of the bundle speckle position behind the described multiple capillary x-ray collimator collimation is 3-10.
2. the fingerprint extraction equipment based on the capillary X-ray pellicle mirror according to claim 1, it is characterized in that: because the bundle speckle of the capillary X-ray pellicle mirror that adopts is bigger, can utilize the bundle speckle of capillary X-ray pellicle mirror to shine whole fingerprint simultaneously, obtain the XRF of fingerprint place diverse location element correspondence simultaneously, just can not obtain fingerprint so do not need that fingerprint is carried out the point by point scanning analysis.
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| CN2010105994049A CN101999901A (en) | 2010-12-22 | 2010-12-22 | Fingerprint extracting equipment based on capillary X ray semitransparent mirror |
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| CN2010105994049A CN101999901A (en) | 2010-12-22 | 2010-12-22 | Fingerprint extracting equipment based on capillary X ray semitransparent mirror |
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Cited By (4)
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| CN105093260A (en) * | 2015-09-22 | 2015-11-25 | 北京师范大学 | Square polycapillary X-ray regulation device and preparation method thereof |
| CN107203749A (en) * | 2017-05-19 | 2017-09-26 | 公安部物证鉴定中心 | Fingerprint is lossless inside a kind of multilayer tape shows system |
| CN109187589A (en) * | 2018-10-19 | 2019-01-11 | 北京市辐射中心 | A kind of burnt X-ray spectral analysis device of Large focal spot copolymerization |
| CN115389538A (en) * | 2022-08-09 | 2022-11-25 | 深圳市埃芯半导体科技有限公司 | X-ray analysis apparatus and method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN109187589A (en) * | 2018-10-19 | 2019-01-11 | 北京市辐射中心 | A kind of burnt X-ray spectral analysis device of Large focal spot copolymerization |
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| CN115389538A (en) * | 2022-08-09 | 2022-11-25 | 深圳市埃芯半导体科技有限公司 | X-ray analysis apparatus and method |
| CN115389538B (en) * | 2022-08-09 | 2023-12-29 | 深圳市埃芯半导体科技有限公司 | X-ray analysis device and method |
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Application publication date: 20110406 |