CN102013012A - Latent fingerprint extraction spectrometer based on capillary X-ray converging lens - Google Patents
Latent fingerprint extraction spectrometer based on capillary X-ray converging lens Download PDFInfo
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- CN102013012A CN102013012A CN2010105994157A CN201010599415A CN102013012A CN 102013012 A CN102013012 A CN 102013012A CN 2010105994157 A CN2010105994157 A CN 2010105994157A CN 201010599415 A CN201010599415 A CN 201010599415A CN 102013012 A CN102013012 A CN 102013012A
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Abstract
The invention relates to a latent fingerprint extraction spectrometer based on a capillary X-ray converging lens. The spectrometer comprises an X-ray light source, the capillary X-ray converging lens, a microscope, a detector and a five-dimensional electric regulating rack for supporting the X-ray light source, the capillary X-ray converging lens, the microscope and the detector. The core of the spectrometer is the capillary X-ray converging lens with a high power density gain, the capillary X-ray converging lens can cause divergent X-rays to be converged so as to form micro focal spots the diameter of which is far smaller than the width of fingerprints and gaps among the fingerprints, and the micro focal spots with high power density can activate the characteristic X-ray corresponding to low-content elements in the fingerprints. Therefore, the spectrometer is especially applicable to the extraction of latent fingerprints. Besides, the spectrometer is portable.
Description
(1) technical field
The present invention relates to the fingerprint extraction technical field, particularly relate to a kind of laten fingerprints and extract spectrometer based on kapillary X-ray convergent lens.Kapillary X-ray convergent lens can be converted into the X ray of dispersing little focal spot, and this little focused spot diameter is less than the width of fingerprint and the space between fingerprint, and the focal spot place has 10
4The power density of order of magnitude gain (enlargement factor), this is convenient to utilize this focal spot to have spatially resolvedly to excite the characteristic X-ray of staying fingerprint place element, thereby utilizes the characteristic X-ray imaging to obtain fingerprint.
(2) background technology
Along with improving constantly of fingerprint extraction technology, fingerprint is more and more important in the effect in criminal investigation field.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, fluorescent reagent method or the like.How fast, harmless and propose laten fingerprints accurately and receive much attention in the criminal investigation field to the extraction of laten fingerprints, existing above-mentioned these methods respectively have the characteristics of oneself, but some experimental implementation is too loaded down with trivial details, and it is not high enough that some extracts precision, so.
In fact, before people's finger stays fingerprint somewhere, usually be to contact some materials, for example, face cream, cleansing solution, oil, dust, explosive, noxious material, drugs or the like, different element correspondences the characteristic X-ray of oneself in these materials, so, if the energetic particle beam that adopts spatial discrimination and intensity to meet the demands carries out the two-dimensional scan analysis to potential fingerprint region, obtain three-dimensional data, wherein one-dimensional data is the intensity of certain element characteristic of correspondence X ray in the fingerprint, two bits is a volume coordinate in addition, so just can utilize these data that latent fingerprint is carried out computer generated image---the characteristic X-ray imaging.Utilize the characteristic X-ray imaging method to take the fingerprint and to judge the fingerprint owner contacted what material before staying fingerprint, this differentiates that to criminal investigation also having important use is worth, so, utilize the characteristic X-ray imaging method to extract laten fingerprints and have important practical significance.
The emphasis that extracts laten fingerprints by the characteristic X-ray imaging method is the microbeam analytical equipment that design is suitable for fingerprint extraction, to guarantee that at first the beam spot size of beating at the energetic particle beam on the fingerprint is less than the width of fingerprint and the space between fingerprint, the intensity that also will guarantee to beat energetic particle beam somewhere simultaneously is enough strong, only in this way could guarantee that the element characteristic of correspondence X ray in the fingerprint is had spatially resolved ejecting.The common microbeam analytical equipment about exciting the elemental characteristic X ray has Electronic Speculum+power spectrum (SEM-EDX), microbeam proton to induce XRF (Micro-PIXE) and microbeam synchrotron radiation X-ray fluorescence (Micro-SXRF), the detectability of first method is higher, be not easy to obtain the characteristic X-ray of low content element, second and the detectability of the 3 two kind of method be lower than first method, can detect the trace element of ppm magnitude, but second and the equipment of the 3 two kind of method huge, the running cost costliness.Simultaneously, above-mentioned three kinds of equipment all are not suitable for the extraction of laten fingerprints on the spot of scene of a crime.
Therefore, how can utilize the characteristic X-ray imaging method to extract laten fingerprints at the scene is the technical matters that those skilled in the art need solve.
(3) summary of the invention
The purpose of this invention is to provide a kind of laten fingerprints based on kapillary X-ray convergent lens and extract spectrometer, this spectrometer utilizes the characteristic X-ray imaging method to carry out fingerprint extraction in the scene of a crime.
Realize the foregoing invention purpose for addressing the above problem, laten fingerprints based on kapillary X-ray convergent lens provided by the invention extracts spectrometer and comprises X ray light source, kapillary X-ray convergent lens, microscope, detector, carrying X ray light source, kapillary X-ray convergent lens, the electronic debugging frame of five dimensions of microscope and detector.Described spectrometer adopts kapillary X-ray convergent lens to assemble the X ray that portable low power sources is sent, thereby obtain the little focal spot of X ray of high power density, the diameter of this little focal spot utilizes the little focal spot of this X ray as the excitaton source that excites element characteristic of correspondence X ray in the fingerprint much smaller than the width of fingerprint and the space between fingerprint.
The scope that described laten fingerprints based on kapillary X-ray convergent lens extracts the spectrometer general assembly (TW) is 2kg-8kg.The general assembly (TW) of this spectrometer depends mainly on the weight of light source, and for example, adopting power is the light source of 3W, and the general assembly (TW) of this spectrometer is 2kg; Adopting power is the light source of 30W, and the general assembly (TW) of this spectrometer is 8kg; When the power of light source was 10W, the total amount of this spectrometer was 4kg, at this moment, because this kind spectrometer has made full use of the performance of kapillary X-ray convergent lens, so that total amount is the spectrometer of 4kg is not only light but also have lower detection limit, was preferred spectrometer.
Described X ray light source is a low power sources, and power bracket is 3W-30W.If the content of element is the ppm magnitude in the laten fingerprints, then adopting power is the light source of 30W, if the content of element is higher than 100ppm in the laten fingerprints, then adopting power is the light source of 3W.
Described X ray light source is portable, and its weight range is 0.5kg-1kg.When the power of light source was 3W, its weight was 0.5kg, and when the power of light source was 30W, its weight was 1kg.
Described kapillary X-ray convergent lens is to be made of ten thousand single glass capillaries of 80-150, the quantity of single capillary has determined the focused spot diameter and the power density gain of kapillary X-ray convergent lens, the inlet end of all single capillaries points to light source, the endpiece of all single capillaries points to the focal spot of kapillary X-ray convergent lens, and the X ray that the arrangement mode of this kind single capillary determines these lens will disperse is converted into little focal spot.
The focused spot diameter scope of described kapillary X-ray convergent lens is 40 μ m-80 μ m.The single capillary quantity that constitutes kapillary X-ray convergent lens is 80 o'clock, and kapillary X-ray convergent lens focused spot diameter is 40 μ m, and the single capillary quantity that constitutes kapillary X-ray convergent lens is 150 o'clock, and kapillary X-ray convergent lens focused spot diameter is 80 μ m.
The power density gain margin at the focal spot position place of described kapillary X-ray convergent lens is 10000-60000.Under the situation of identical X ray light source, the gain of the power density at the focal spot position place of kapillary X-ray convergent lens is big more, utilizes the efficient of kapillary X-ray convergent lens extraction laten fingerprints high more.The single capillary quantity that constitutes kapillary X-ray convergent lens is 80 o'clock, and the power density gain at the focal spot position place of kapillary X-ray convergent lens is 10000; The single capillary quantity that constitutes kapillary X-ray convergent lens is 150 o'clock, and the power density gain at the focal spot position place of kapillary X-ray convergent lens is 60000.
The length range of described kapillary X-ray convergent lens is that the scope of 100mm-300mm, inlet diameter is that the scope of 10mm-20mm, outlet diameter is that the scope of 5mm-10mm, inlet focal length is that 50mm-200mm, outlet focal range are that the diameter range of 20mm-60mm, xsect maximum is 15mm-40mm.When the length of kapillary X-ray convergent lens was 100mm, its inlet diameter was that 10mm, outlet diameter are that 5mm, inlet focal length are that 50mm, outlet focal length are that the diameter of 20mm, xsect maximum is 15mm; When the length of kapillary X-ray convergent lens was 300mm, inlet diameter was that 20mm, outlet diameter are that 10mm, inlet focal length are that 200mm, outlet focal length are that the diameter of 60mm, xsect maximum is 40mm.
Described microscopical enlargement factor scope is 20-100.Preferably, microscopical enlargement factor is 70, and at this moment, microscopical object distance is suitable for the focal length of kapillary X-ray convergent lens most.
Described detector is the energy resolution X-ray detector, and the energy resolution scope of detector is 130eV-220eV.When the energy difference of the characteristic curve of different elements in the laten fingerprints during less than 230eV, adopting energy resolution is the detector of 130eV, and when the energy difference of the characteristic curve of different elements in the laten fingerprints during greater than 230eV, adopting energy resolution is the detector of 220eV.
The spatial discrimination scope of the electronic debugging frame of described five dimensions is 10 μ m-40 μ m.Preferably, the spatial discrimination of the electronic debugging frame of five dimensions is that 20 μ m are comparatively desirable, is convenient to extract efficiently laten fingerprints this moment.
The invention has the beneficial effects as follows, owing to adopted the kapillary X-ray convergent lens of high power density gain, so reduced the detectability of described spectrometer, this is convenient to obtain low content element characteristic of correspondence X ray in the fingerprint, thereby this spectrometer especially is suitable for the extraction of laten fingerprints; This spectrometer is of portable form, and is convenient to utilize the characteristic X-ray imaging method to take the fingerprint in the scene of a crime; Can also judge the fingerprint owner contacted what material before staying fingerprint when taking the fingerprint at the scene, thereby dwindle the criminal investigation scope; This spectrometer has used the low power X-ray light source, and the X ray that adopts kapillary X-ray convergent lens that light source is dispersed is converged to little focal spot, so improved X ray spectrometer user's coefficient safe in utilization.
(4) description of drawings
Fig. 1 is based on the synoptic diagram of the laten fingerprints extraction spectrometer of kapillary X-ray convergent lens;
Fig. 2 is the synoptic diagram of kapillary X-ray convergent lens;
Fig. 3 is a kapillary X-ray convergent lens sectional view.
(5) embodiment
Referring to Fig. 1, extract spectrometer based on the laten fingerprints of kapillary X-ray convergent lens and comprise X ray light source 1, kapillary X-ray convergent lens 2, microscope 4 and detector 5, and the fixing electronic debugging frame of five dimensions of X ray light source 1, kapillary X-ray convergent lens 2, microscope 4 and detector 5.The X ray that X ray light source 1 sends is converged to little focal spot 3 through kapillary X-ray convergent lens, the position of the little focal spot 3 in microscope 4 location, under the auxiliary positioning of microscope 4, the little focal spot of X ray is beaten at the fingerprint place, detector 5 is surveyed and is gone out element characteristic of correspondence X ray signal from fingerprint, by the electronic debugging frame of five dimensions the fingerprint place is carried out scanning analysis, the data of analyzing are carried out imaging analysis by computing machine, thereby obtain fingerprint.
Referring to Fig. 2, the inlet end diameter D of kapillary X-ray convergent lens
InWith endpiece diameter D
OutDiameter D with its maximum cross-section
MaxCompare, the above two are less, and this has guaranteed that these lens collect expeditiously from the diverging X-ray of X ray light source, have also guaranteed these X ray of dispersing are converted into little focal spot simultaneously; Inlet end diameter D
InWith endpiece diameter D
OutCompare, the former is bigger, and this has guaranteed that lens have high-transmission efficient; Kapillary X-ray convergent lens inlet focal length F
1With outlet focal length F
2Compare, the former is bigger, and this has guaranteed that these lens can make full use of the X ray light source.The length l of kapillary X-ray convergent lens is decided according to the material of lens, usually, the atomic number that constitutes kapillary X-ray convergent lens is high more, the length of kapillary X-ray convergent lens is big more, the atomic number that constitutes kapillary X-ray convergent lens material is low more, and the length of kapillary X-ray convergent lens is more little.
Referring to Fig. 3, the diameter that constitutes the single capillary of kapillary X-ray convergent lens is identical substantially, because it is big to form the single tube quantity of this kind kapillary X-ray convergent lens, thereby has determined that the internal diameter of single capillary is basic identical, this has guaranteed that these lens have high performance to satisfy the extraction to fingerprint.
Provide the example that extracts spectrometer based on the laten fingerprints of kapillary X-ray convergent lens below: the general assembly (TW) of extracting spectrometer based on the laten fingerprints of kapillary X-ray convergent lens is 4kg, use molybdenum target X ray light source, its power is 10W, the weight of this light source is 0.7kg, kapillary X-ray convergent lens is to be made of 1,200,000 single glass capillaries, the inlet end of all single capillaries points to light source, the endpiece of all single capillaries points to the focal spot of kapillary X-ray convergent lens, the focused spot diameter of this kapillary X-ray convergent lens is 60 μ m, the power density gain at the focal spot position place of this kapillary X-ray convergent lens is 30000, the length of this kapillary X-ray convergent lens is 160mm, inlet diameter is 15mm, outlet diameter is 9mm, the inlet focal length is 90mm, the outlet focal length is 40mm, the diameter of xsect maximum is 30mm, using microscopical enlargement factor is 70, adopting detector is the energy resolution X-ray detector, the energy resolution of detector is 140eV at the 5.9keV energy point, adopt five the dimension electronic debugging frame spatial discriminations be 30 μ m.
Claims (2)
1. the laten fingerprints based on kapillary X-ray convergent lens extracts spectrometer, it comprises the electronic debugging frame of five dimensions of X ray light source, kapillary X-ray convergent lens, microscope, detector, carrying X ray light source, kapillary X-ray convergent lens, microscope and detector, it is characterized in that:
Described kapillary X-ray convergent lens is to be made of ten thousand single glass capillaries of 80-150, and the diameter of single capillary is identical substantially, and the inlet end of all single capillaries points to light source, and the endpiece of all single capillaries points to the focal spot of kapillary X-ray convergent lens;
The inlet end diameter D of described kapillary X-ray convergent lens
InWith endpiece diameter D
OutDiameter D with its maximum cross-section
MaxCompare, the above two are less; Inlet end diameter D
InWith endpiece diameter D
OutCompare; Kapillary X-ray convergent lens inlet focal length F
1With outlet focal length F
2Compare, the former is bigger;
The length range of described kapillary X-ray convergent lens is that the scope of 100mm-300mm, inlet diameter is that the scope of 10mm-20mm, outlet diameter is that the scope of 5mm-10mm, inlet focal length is that 50mm-200mm, outlet focal range are that the diameter range of 20mm-60mm, xsect maximum is 15mm-40mm;
The focused spot diameter scope of described kapillary X-ray convergent lens is 40 μ m-80 μ m, and power density gain (enlargement factor) scope at its focal spot position place is 10000-60000.
2. the laten fingerprints that is used for the kapillary X-ray convergent lens of fingerprint extraction according to claim 1 extracts spectrometer, it is characterized in that: the kapillary X-ray convergent lens that has adopted the high power density gain, reduced the detectability that extracts spectrometer based on the laten fingerprints of kapillary X-ray convergent lens, this is convenient to obtain low content element characteristic of correspondence X ray in the fingerprint, thereby this spectrometer especially is suitable for the extraction of laten fingerprints.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104502375A (en) * | 2014-12-22 | 2015-04-08 | 北京师范大学 | Quasi monochromatic light imaging system |
Citations (5)
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| JP2007093314A (en) * | 2005-09-28 | 2007-04-12 | Shimadzu Corp | X-ray focusing arrangement |
| CN101499327A (en) * | 2009-03-20 | 2009-08-05 | 北京师范大学 | Plateau capillary X-ray converging lens |
| CN101498647A (en) * | 2009-03-20 | 2009-08-05 | 北京师范大学 | Micro-beam X-ray fluorescence equipment used for atmosphere particle single-particle analysis |
| CN201477030U (en) * | 2009-03-20 | 2010-05-19 | 北京师范大学 | Micro-bundle X-ray fluorescence device for single granule analyze of atmosphere granules |
| CN201936323U (en) * | 2010-12-22 | 2011-08-17 | 中国政法大学 | Latent fingerprints extracting spectrometer based on capillary X-ray focusing lens |
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- 2010-12-22 CN CN2010105994157A patent/CN102013012A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007093314A (en) * | 2005-09-28 | 2007-04-12 | Shimadzu Corp | X-ray focusing arrangement |
| CN101499327A (en) * | 2009-03-20 | 2009-08-05 | 北京师范大学 | Plateau capillary X-ray converging lens |
| CN101498647A (en) * | 2009-03-20 | 2009-08-05 | 北京师范大学 | Micro-beam X-ray fluorescence equipment used for atmosphere particle single-particle analysis |
| CN201477030U (en) * | 2009-03-20 | 2010-05-19 | 北京师范大学 | Micro-bundle X-ray fluorescence device for single granule analyze of atmosphere granules |
| CN201936323U (en) * | 2010-12-22 | 2011-08-17 | 中国政法大学 | Latent fingerprints extracting spectrometer based on capillary X-ray focusing lens |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104502375A (en) * | 2014-12-22 | 2015-04-08 | 北京师范大学 | Quasi monochromatic light imaging system |
| CN104502375B (en) * | 2014-12-22 | 2018-07-06 | 北京师范大学 | Quasi-monochromatic light imaging system |
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Application publication date: 20110413 |