CN1038174A - Directly short wave ultraviolet light is taken fingerprint technique and equipment - Google Patents
Directly short wave ultraviolet light is taken fingerprint technique and equipment Download PDFInfo
- Publication number
- CN1038174A CN1038174A CN 88103139 CN88103139A CN1038174A CN 1038174 A CN1038174 A CN 1038174A CN 88103139 CN88103139 CN 88103139 CN 88103139 A CN88103139 A CN 88103139A CN 1038174 A CN1038174 A CN 1038174A
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- China
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- lens
- ultraviolet
- shortwave
- camera
- fingerprint
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Abstract
The specialized equipment that the direct short wave ultraviolet light of a kind of usefulness is taken the method for fingerprint and cooperated with it, this method is to be light source with the uviol lamp, use superchromaticity ultraviolet camera lens and shortwave ultraviolet interfere type optical filter, with the ultraviolet spectrum dry plate is photosensitive material, mode by photography writes down the fingerprint trace that forms the reflectance rate variance on the class materials such as glass and plastics, organic glass, enamel, pottery by the effect of ultraviolet source, thereby reaches the purpose of separating fingerprint trace from mixed and disorderly background.
Description
The invention belongs to criminal test camera technique field, particularly relate to the specialized equipment that the direct short wave ultraviolet light of a kind of usefulness is taken the method for fingerprint and cooperated with it.
Take the vestige that takes the fingerprint at present in the scene of a crime, often mixed and disorderly, rough and uneven in surface because of background images, reason such as reflective is brought very big difficulty to record, for example, be imprinted on double-sided glass, fingerprint trace on the objects such as figured plate glass, minute surface, bulb and enamel, pottery, plastics, organic glass then can't extract with the conventional method shooting, has directly influenced case cracking.In the face of this class difficult problem, China continued to use " being coated with China ink ", " wiping " in the past always and " scrapes mercury " methods such as " adding ground glass " solves, but these methods mostly are to carry out on the basis that the censorship original paper is destroyed to some extent, and shooting effect is also undesirable.This class problem also is acknowledged as in photograph circle of international criminal test and fails a difficult problem of fine solution for many years, through looking into Ireland " international tribunal's science " (" Forensic science international ") U.S.'s " forensic science " (" Journal of Forensic science "), Britain's " court's social science " (" Journal of the Forensic science society ") there is no report, when looking into Britain's " police's photography " and only having reported fingerprint on taking double-sided glass, take the fingerprint dusting, the back side big background of glass lined visual contrast obtains the method for fingerprint photography, and the method that this method and China continue to use always is the same all can not well to solve the problem that obtains the crime fingerprint under complex background.
The objective of the invention is to propose a kind of solution and absorb the method for fingerprint and the equipment that cooperates this method to use under complex background, promptly directly short wave ultraviolet light is taken fingerprint technique and relevant uv photography camera lens and corresponding optical filter, photosensitive material and light source.
The present invention is according to material strong absorption ultraviolet lights such as glass, and this ultimate principle of superincumbent fingerprint material reflection short wave ultraviolet light studies and adhere to.When on the picked-up category of glass material during fingerprint, give direct short wave ultraviolet light source, category of glass material absorbing short wave ultraviolet light then, and fingerprint reflection short wave ultraviolet light, so promptly form a reflectance rate variance in the shortwave ultraviolet region, the jamming pattern that meanwhile exists in glass back then can not get irradiation because of class materials such as glass itself have absorbed short wave ultraviolet light, so reflection does not then exist, thereby got rid of interference to the front finger print image.Managing the picture record that the short wave ultraviolet light district forms is got off according to above-mentioned principle promptly is the method that the present invention relates to and the equipment of corresponding use.
Content of the present invention comprises a kind of method and corresponding apparatus of taking fingerprint.
The said method of the present invention is to be light source with the shortwave uviol lamp, use superchromaticity ultraviolet camera lens and shortwave ultraviolet interfere type optical filter, with the ultraviolet spectrum dry plate is photosensitive material, mode by photography writes down the fingerprint trace that forms the reflectance rate variance on the class materials such as glass and plastics, organic glass, enamel, pottery by the effect of ultraviolet source, thereby reaches the purpose of clearly separating fingerprint trace from mixed and disorderly background.
Operating process of the present invention: get a ultraviolet spectrum dry plate, be built in camera phase plane place in the darkroom, shut camera, at the preposition shortwave ultraviolet interfere type optical filter of camera lens, under visible light, focalize then, the light that enters camera is controlled on the wave band that needs, opens the shortwave uviol lamp, promptly capable of taking pictures.
The said equipment that matches with said method of the present invention comprises ultraviolet light source, uv photography camera lens, ultraviolet dry plate photosensitive material and shortwave ultraviolet interfere type optical filter, the superchromaticity camera lens formed by the lens of five or six separation of uv photography camera lens wherein, it is characterized in that its imaging object distance is 2f '-∞, the imaging wave band is 200-900nm, and film size is 36 * 24mm.When using the uv photography camera lens, photosensitive emulsion on its photosensitive material is all responsive to blue streak, purple light, long wave ultraviolet light sensitization, in order to prevent other light interference fingerprint image, therefore before the uv photography camera lens, should add the shortwave ultraviolet interfere type optical filter that matches with ultraviolet light source and uv photography camera lens, to filter unwanted light.
A difficult problem of failing fine solution for many years that the invention solves that criminal test photograph circle generally acknowledges, it is big to have practical value, and small investment is effective, can increase work efficiency, reduce labor intensity and also can not damage the censorship original paper, can be in superiority and characteristics such as brightroom operations.
Further specify this method and equipment thereof below in conjunction with embodiments of the invention and accompanying drawing thereof.
Accompanying drawing 1 is an image pickup method synoptic diagram of the present invention.
Accompanying drawing 2 is the light path synoptic diagram of the uv photography camera lens that relates among the present invention.
Among Fig. 11 is camera, and moving is shortwave ultraviolet interfere type optical filter, and 3 is short wave ultraviolet light spectrum dry plate, and 4 is the shortwave uviol lamp, 5 is superchromaticity uv photography camera lens, and 6 is glass surface, and 7 is glass back, 8 is glass, and 9 is short wave ultraviolet light, and 10 is other stray light.
Among Fig. 2 11 is quartz lens, and 12 is fluorite lens, and 13 is fluorite lens, and 14 is grating, and 15 is quartz lens, and 16 is fluorite lens.
Embodiment: in the method involved in the present invention, directly the crest of shortwave ultraviolet light source is 254nm, it is 254-862nm that the superchromaticity quartz lens sees through scope, the sense color range of short wave ultraviolet light spectrum dry plate is 200-400nm, the centre wavelength of shortwave ultraviolet interfere type optical filter is 254nm, bandwidth is 50nm, and cutoff wavelength is 800nm.It is operating as: get a slice 43cm ultraviolet spectrum dry plate 3, be built in the phase plane place of camera 1 in the darkroom, shut camera, under visible light, focus, before camera lens 5, add a shortwave ultraviolet interfere type optical filter 2 then, the light that enters camera is controlled in the above-mentioned wave band, turn on short wave ultraviolet light lamp 4, what get final product is fingerprint trace on the glass surface 6, under the irradiation of shortwave ultraviolet light source, glass 8 absorbs short wave ultraviolet light 9, and fingerprint reflection short wave ultraviolet light 9 is this promptly at reflectance rate variance of shortwave ultraviolet region formation, be taken on ultraviolet spectrum dry plate 3 and imaging, the jamming pattern that meanwhile exists on the glass back 7 then can not get irradiation because of glass 8 itself has absorbed short wave ultraviolet light 9, does not then exist so reflect, thereby to have got rid of interference to glass surface 6 finger print images.All responsive because of the photosensitive emulsion that is contained on the magazine photosensitive material again to blue streak, purple light, long wave ultraviolet light sensitization, under visible light, take pictures and must have the stray light line.Therefore 2 of shortwave ultraviolet interfere type optical filters before the camera lens 5 play the effect that filters stray light 10, fingerprint is taken a picture more can obtain effect clearly.
Comprise uv photography camera lens, shortwave ultraviolet interfere type optical filter for the equipment that relates in the method for the present invention, ultraviolet dry plate photosensitive material and shortwave ultraviolet light source, said uv photography camera lens is made up of the lens of five separation, and wherein spacing d between the radius-of-curvature r of each sheet lens, lens and lens and lens material n are:
r d n
-36.75
1.5 quartz lens 11
89.18
1
52
4.6 fluorite lens 12
-50.7
0.2
22.97
5.6 fluorite lens 13
-137.33
∞ 4
(grating) grating 14
4
-36.75
2 quartz lenss 15
18.828
6.6
36.75 fluorite lens 16
3.8
-57.41
The focal distance f of camera lens '=100mm, imaging aperture d/f '=1/5.6.
Claims (4)
1, a kind of method of taking fingerprint, particularly a kind ofly be used to take the method that is subjected to the difficult fingerprint of background interference on the type objects such as category of glass and plastics, enamel, pottery, it is characterized in that this method is is light source with direct shortwave uviol lamp, the ultraviolet spectrum dry plate is a photosensitive material, uses the superchromaticity quartz lens and adds shortwave ultraviolet interfere type optical filter; Its operation is to get a ultraviolet spectrum dry plate, is built in camera phase plane place in the darkroom, shuts camera, under visible light, focus, before camera lens, add a shortwave ultraviolet interfere type optical filter then, the light that enters camera is controlled on the wave band that needs, open the shortwave uviol lamp, promptly capable of taking pictures.
2, according to the method for the said shooting fingerprint of claim 1, the crest that it is characterized in that said direct shortwave ultraviolet light source is 254nm; It is 254-862nm that said superchromaticity quartz lens sees through scope; The sense color range of said short wave ultraviolet light spectrum dry plate is 200-400nm; The centre wavelength 245nm of said shortwave ultraviolet interfere type optical filter, bandwidth is 50nm, cutoff wavelength is to 800nm.
3, a kind of camera installation that matches with the described shooting fingerprint method of claim 1 and use comprises the uv photography camera lens, shortwave ultraviolet interfere type optical filter, ultraviolet dry plate photosensitive material and ultraviolet light source; Said uv photography camera lens is formed the superchromaticity camera lens by the lens of five or six separation, it is characterized in that the imaging object distance is 2f '-∞, and the imaging wave band is 200-900nm, and film size is 36 * 24mm.
4, according to the said camera installation of claim 3, it is characterized in that said uv photography camera lens is made up of the lens of five separation, spacing d between the radius-of-curvature r of wherein each lens, lens and lens and lens material n are:
r d n
-36.75
1.5 it is quartzy
89.18
1
52
4.6 fluorite
-50.7
0.2
22.97
5.6 fluorite
-137.33
∞ 4
4 (gratings)
-36.75
2 quartz
18.828
6.6
36.75
3.8 fluorite
-57.41
The focal distance f of camera lens '=100mm, imaging aperture d/f '=1/5.6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88103139 CN1009224B (en) | 1988-05-30 | 1988-05-30 | Direct short wave ultraviolet light finger print shooting method and equipment thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88103139 CN1009224B (en) | 1988-05-30 | 1988-05-30 | Direct short wave ultraviolet light finger print shooting method and equipment thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1038174A true CN1038174A (en) | 1989-12-20 |
| CN1009224B CN1009224B (en) | 1990-08-15 |
Family
ID=4832458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88103139 Expired CN1009224B (en) | 1988-05-30 | 1988-05-30 | Direct short wave ultraviolet light finger print shooting method and equipment thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1009224B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106141460A (en) * | 2015-04-03 | 2016-11-23 | 宝山钢铁股份有限公司 | Welding machine laser beam optical mode detecting system and method |
-
1988
- 1988-05-30 CN CN 88103139 patent/CN1009224B/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106141460A (en) * | 2015-04-03 | 2016-11-23 | 宝山钢铁股份有限公司 | Welding machine laser beam optical mode detecting system and method |
| CN106141460B (en) * | 2015-04-03 | 2018-03-30 | 宝山钢铁股份有限公司 | Welding machine laser beam optical mode detecting system and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1009224B (en) | 1990-08-15 |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |