CN105388140B - Measuring instrument for site invisible fingerprint display and contained substance thereof - Google Patents
Measuring instrument for site invisible fingerprint display and contained substance thereof Download PDFInfo
- Publication number
- CN105388140B CN105388140B CN201510868921.4A CN201510868921A CN105388140B CN 105388140 B CN105388140 B CN 105388140B CN 201510868921 A CN201510868921 A CN 201510868921A CN 105388140 B CN105388140 B CN 105388140B
- Authority
- CN
- China
- Prior art keywords
- laser
- raman
- fingerprint
- fluorescence
- point
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
The invention discloses a measuring instrument for site invisible fingerprint display and contained substance thereof, which comprises a near deep ultraviolet laser emitter, a laser spot reshaper, a laser beam expanding collimator, a first beam splitter, a zooming or non-zooming object lens, a second beam splitter, a third beam splitter, a relay optical system, a spot conversion line optical system, a spectrum forming system, an optical or mechanical sample scanning system, a target positioning system, a data processing and wireless transceiving system and an additional ultraviolet lamp and a camera which are connected in sequence. After invisible fingerprint shooting and raman, fluorescence and laser three-channel real-time point to point fusing, a whole sample is scanned and is subjected to GPS (global position system) positioning, and data processing of spectrum separating, wave peak seeking, spectrum library establishing, substance recognizing and the like are performed, wireless data are transmitted to the Public Security Bureau and are compared with a database, then a case can be quickly solved, who is he/she can be known from the fingerprint, and what crime does he/she committed is known from the substance contacted by the fingers. The measuring instrument is portable, high in sensitivity, far in detection distance and high in resolution.
Description
Technical field
The present invention relates to the nearly deep ultraviolet Raman spectrometer that stealth fingerprint in indoor and outdoor scene shows and its internal substance is determined.
Background technology
At present the method for collection fingerprint is spray all-purpose adhesive or other catalyst are taken pictures or upper gypsum copies to lab analysis,
Formality is complicated, and speed is very slow, and can destroy fingerprint because foreign matter is covered；If finger mark is in the wild, especially in the sun hidden
Shape fingerprint, scene is taken pictures very difficult；Therefore in recent years also useful ultraviolet light is taken pictures, because in ultraviolet sunshine mostly
Sponged by ozone layer, intensity is very weak；But uviol lamp wavelength used can not possibly be very short, and wave band can not possibly be very narrow, therefore
Sunlight interference is yet suffered from, and contrast is still not high enough.Additionally, all can only see image regardless of method, it is impossible to measure hand
The material that abutment is crossed. also someone wants to survey fingerprint with surface enhanced near-infrared or visible ray Raman spectrometer, but first has to referring to
Line is transferred to the surface enhanced chip that Nano metal powder does and could survey, and this is the work being difficult, to stealthy fingerprint often without
Method realizes that section enables transfer fingerprint and is also more or less deteriorated, and suspect is rejected by crime card acceptable as court
According to；In addition, near-infrared or visible ray Raman at all cannot not shielded because of serious sunlight and ambient light interference at outdoor scene
Use, it is necessary to which fingerprint is adopted to laboratory could be measured.Therefore, a kind of instrument is badly in need of in criminal investigation and judicial department, and it will be
Indoor and outdoor scene is discontiguous to be not added with any reinforcing agent or the stealthy fingerprint of taking of catalyst knows that whom he/her is, again can be fast
Speed correctly measures the material (explosive, drugs, blood component etc.) that finger contacted and knows that he/her commits excesses what crime, and energy
Public security bureau is wirelessly passed in the place that image and data and GPS determine quickly to solve a case, but this instrument is at present in the world also not
Exist；The invention solves the problems that exactly this difficult problem, method used be can make in the sun quick nondestructive measurement it is near dark purple
Outer image Raman spectrometer.
Raman spectrum (Raman spectra) is a kind of scattering spectrum.Nineteen twenty-eight, C.V.Raman (Raman) is being tested
Shi Faxian, when light passes through transparent medium by the light of molecular scattering due to acquisition or off-energy meeting occurrence frequency change, this shows
As being referred to as Raman scattering.In the scattering spectrum of transparent medium, frequency and incident light frequency υ0Identical composition is referred to as Rayleigh
Scattering；Frequency is symmetrically distributed in υ0The spectral line or bands of a spectrum υ of both sides0±υ1Referred to as Raman scattering or Raman spectrum, wherein υ0-υ1Dissipate
Penetrate and be stokes scattering, be susceptible to ， Subcommittee-to and study carefully more；υ0+υ1Scattering anti-Stokes scattering, be not susceptible to ， Subcommittee-to study carefully compared with
It is few.By atom and molecular composition, they are ceaselessly vibrating and are rotating any material, and Raman spectrum analysis method can be used to detect thing
The vibration and rotation spectrum of matter molecule, and the vibration of molecule and rotation spectrum are unique, equivalent to the fingerprint of material, therefore by drawing
The analysis of graceful spectrum can accurately differentiate the composition of different material, more much more accurate than general wide range spectrometer；And draw
The position of graceful spectrum does not change with optical maser wavelength and environmental change, with uniqueness；Its range of application throughout material, chemistry,
Nearly all field such as physics, biology and medical science, for qualitative analysis, quantitative analysis and measure molecular structure have very big valency
Value.But Raman spectrum due to be scattering spectrum be not that absorption spectrum its sensitivity is not high, if the scattering section of measured matter exists
10-27(cm2/ melecule.srd) often detect below less than therefore existing near-infrared and visible ray Raman spectrometer can only
The material of the observable milligram level of eyes is detected, for the invisible micro substance of eyes then cannot be detected.For visible ray
With near-infrared Raman, due to separating fluorescence, it is interfered, makes signal to noise ratio very low；And visible ray, near-infrared laser meeting
Retina is damaged through eyeball, not the ideal chose of Raman spectrometer probe source.In addition, if receiving field (sunshine etc.)
Or the interference of indoor environment light (light etc.) can not be used.Even if wanting to use, it is also necessary to object sampling is placed on into shading and is seen
Examining in cavity or object is covered on could measure in observation cavity, adjust the distance farther out or cannot the object of shading just cannot measure.
In addition, current Raman spectrometer is due to using longer wavelengths of near-infrared or visible light lasers, it is very difficult to excite Raman, therefore greatly
Many confocal systems using microscopic structure, can only illuminate several microns of object, detect several millimeters of distance, and detection is whole
Target must make lengthy scan with microscope, and volume is costly greatly；Due to the typically no imaging system of existing Raman spectrometer,
Also cannot observe and record the target to be detected.So there is one kind or many in existing near-infrared and visible ray Raman spectrometer
Plant following shortcoming：
(1) sensitivity is too low, can only detect the material of milligram level；
(2) Raman goes to increase substantially sensitivity without resonance effects；
(3) Raman overlaps with fluorescence, and spectrum is inseparable, serious interference；
(4) the higher fluorescence channel of non sensitivity can be utilized；
(5) without imaging band, system calibration is difficult, and target is difficult to observe and positions；
(6) detection range is too near, object cannot be placed directly under microscope and be measured；
(7) sensing point is too little, to go for a long time to scan whole target；
(8) need to make target to measure after artificial sample, scene not contact analysis cannot be made；
(9) easily not shield EMC measurement cannot be made by sunlight and ambient light interference；
(10) near-infrared and visible laser are easily damaged the retina of operating personnel.
The content of the invention
In order to overcome the deficiencies in the prior art, present invention aim to provide a kind of scene stealth fingerprint show and its
Internal substance measuring instrument.The optical maser wavelength that the measuring instrument is used is 200-270nm, and we cry it for nearly dark purple outskirt, here
Region there is no sunshine, be day-old chick, because sunshine is all sponged by ozone layer；In addition, in this wave band Raman
There is pre- resonance effects, Raman signal can be made to improve several orders of magnitude, the Raman that the 213nm laser of 30mw is produced is with 300mw's
The Raman that 785nm laser is produced is compared, and signal can at least increase by 10,000 times the advantages of disturbed due to shortwave, resonance, unstressed configuration.
A kind of scene stealth fingerprint shows and its internal substance measuring instrument, including the nearly deep ultraviolet laser transmitting being sequentially connected
Device, laser spot shaper, laser bundle-enlarging collimation device, two-dimensional scan speculum, the first beam splitter, zoom or not varifocus objective,
Second beam splitter, the 3rd beam splitter, relay optical system, point turn line optics system, into spectra system, specimen scanning system, data
Processing system, GPS location and data wireless transceiver system, and further include additional ultraviolet irradiation lamp and camera；Institute
The mid portion 1-10% regions of the quartz glass substrate of the first beam splitter stated apply the highly reflecting films of laser, but the saturating Raman of this film
And fluorescence, and remaining 90-99% region applies saturating laser, Raman, the anti-reflection film of fluorescence and (therefore makes the first beam splitter both backward-reflected lasers
Saturating laser)；The described saturating Raman of the second beam splitter backward-reflected laser and fluorescence；The described graceful fluorescence of the 3rd beam splitter reverse drawing；So
Laser, Raman, three passages of fluorescence can be separated；Described relay optical system, the illumination point reflection from target, dissipates
The photoimaging penetrated and produce is to fibre bundle head；Described point turns line optics system, relay optical system into point picture or line
Shape as being converted into slit；Described includes using grating and ultraviolet intensified CCD and Tunable filters and light into spectra system
Electric two kinds of multiplier tube (or snowslide pipe)；Described two-dimensional scan speculum and the adjustable azimuth of ultraviolet irradiation lamp and the angle of pitch with
Oblique fire angle obtain stealthy fingerprint as；Described specimen scanning system includes 2-D optical scanning or mechanical scanning to whole sample
Pointwise takes spectrum；Described data handling system by Raman, fluorescence, the point-to-point real time fusion of laser triple channel, and make spectrum show,
Spectrum is separated, crest is positioned, spectrum storehouse is set up, Object Classification process, then by GPS location and data wireless transceiver system,
Data are wirelessly transmitted to the database of public security bureau and compare.
The wavelength of described ultraviolet irradiation lamp be 200-380nm, it can with adjustment angle cast oblique rays on fingerprint make background light from
Specular reflection falls, but makes rough fingerprint reflected light and fluorescence the swashing with described camera or Raman spectrometer for exciting
Optical channel is imaged, and improves contrast.
Described two-dimensional scan speculum is the galvanometer of X and Y-direction, and adjustable angle does not cast oblique rays on fingerprint by object lens to be made to swash
Light background falls but makes the laser of rough fingerprint reflected light and fluorescence by object lens in Raman spectrometer to lead to from Specular reflection
Road is imaged, and improves contrast；And make two-dimensional scan pointwise to sample and take spectrum.
Described nearly deep ultraviolet laser wavelength is 200-270nm, and described Raman light depends on used with fluorescence bands
The requirement of laser instrument and system design, not overlap as principle.
The relay optical system is the illumination point reflection from target, the image formation by rays for scattering, exciting to fibre bundle head
Portion simultaneously makes spot size match with slit, makes F numbers match with spectrometer.
Described point turns line optics system includes that point turns line fibre bundle or virtual slit, and described point turns line fibre bundle by many
Root optical fiber composition becomes shape of slit a circle luminous point, described virtual slit circle luminous point is cut into after several pieces of reshapings be combined into it is long and
The light (because no mechanical slot, so being virtual slit) of narrow shape of slit.
It is described that dispersion is made using grating or prism into spectra system, go out spectrum with the ultraviolet intensified CCD of face battle array or not only gone out spectrum but also be imaged；
Or make dispersion using Tunable filters, gone out with single or multiple photodiode PD, photomultiplier PMT or snowslide pipe APD
Spectrum, or be that ICCD or area array CCD had not only gone out spectrum but also be imaged using ultraviolet Enhanced Imaging CCD；Described Tunable filters are adopted and turned
The narrow band pass filter of dynamic angle, acousto-optic tunable filter or liquid crystal tunable optical filter.
Described measuring instrument makes Raman and fluorescence channel share a spectrometer.
Described fluorescence cutoff wavelength is higher by 100-200 nanometers than expected Raman light cutoff wavelength.
Therefore the nearly deep ultraviolet Raman spectrometer of described portable triple channel, the Ultra-Violet Laser for being used can not penetrate eyeball
Retina will not be damaged, it is comparatively safe to eyes；Instrument is portable, outer discontiguous quick nondestructive of making can be measured indoors.
Beneficial effects of the present invention are：Individual carries, and sensitivity is high, and lighting point is big, and detection range is remote, high resolution, both
Can scene take stealthy fingerprint in the sun, can quickly measure and recognize the material that finger contacted again and accomplish quickly to solve a case, it is sharp
With Raman, fluorescence, the point-to-point real time fusion of laser triple channel, also other liquid, solid, gas can not be shielded in the sun
Not contact measurement, and eyes are comparatively safe.
Description of the drawings
Fig. 1 is a kind of laser, Raman, fluorescence triple channel with uviol lamp and camera that the embodiment of the present invention 1 is provided
The index path of point-to-point real time fusion system, using slit, grating and ultraviolet enhancing linear array or area array CCD spectrum is taken；
Fig. 2 is illustrated can thoroughly be separated in nearly dark purple outskirt Raman and fluorescence, not interfere with each other；
Fig. 3 is laser waist spot imaging schematic diagram；
Fig. 4 is laser spot dimensional drawing；
Fig. 5 is that the point used in the embodiment of the present invention turns line fibre bundle schematic diagram；
Fig. 6 is that the point used in the embodiment of the present invention turns line virtual slit schematic diagram；
Fig. 7 a are the Raman picture point of oval laser lighting point；Fig. 7 b are the fibre bundle picture that point turns line；
Fig. 8 is the relation of the optical transmittance with wavelength of the low power microcobjective used in the embodiment of the present invention；
Fig. 9 is the ray tracing result from laser to focal length microcobjective；
Figure 10 is a kind of Raman, fluorescence, visible ray threeway with uviol lamp and camera that the embodiment of the present invention 2 is provided
The index path of the point-to-point real time fusion system in road, here does not use grating beam splitting and ultraviolet intensified CCD but uses tunable filter
Mating plate makees dispersion and takes spectrum using single or multiple PD, PMT or APD；
Figure 11 a be the embodiment of the present invention in the sun shooting stay on aluminium pot thumb stealth fingerprint；
Figure 11 b are the materials in the thumb that Raman spectrometer used by the embodiment of the present invention is measured in the sun.
Specific embodiment
Principle
The intensity of Raman signal is determined by following formula：
I=CNI0σΩSF(T) (1)
In formula, I is Raman light intensity, and C is constant, and N is molecular number density, I0It is incident intensity, σ is effective Raman scattering
Sectional area, Ω is the Raman scattering solid angle that receiving aperture is collected, and S is the corresponding laser effective illuminated area of receiving aperture, F
(T) it is to characterize temperature to observing the function that thing, laser and reception system affect.For fixed laser power and measured object
For matter, it is possible to use parameter typically only have σ, Ω and S tri-.
σ is effective raman scattering cross section product, to predetermined substance, the pass of σ and incident laser frequency relevant with laser frequency
System is determined by following formula:
In formula, σmn(υ0) for certain molecule when energy level is redirected from m to n states, to incident frequencies be υ0Laser effective drawing
Graceful scattering resonance state, υmnIt is the Raman frequency shift of the molecule.The formula points out that raman scattering cross section accumulates σmn(υ0) and laser frequency υ0
4 powers be directly proportional or and wavelength X04 powers be inversely proportional to, therefore optical maser wavelength is shorter, and Raman scattering is stronger.
As incident light frequency υ0The resonant frequency υ of close molecular entergy level bounceeWhen, υe 2-υ0 2Tend to zero, Raman scattering can be anxious
Sharp increase is resonated greatly, up to 106, we make the result tested of 229nm laser and show, the Raman scattering of most materials cuts
Area can increase by more than 1,000 times. because υeVery high, this only could occur in ultra-violet (UV) band, in near-infrared and visible ray
Qu Jun can not occur., as shown in Figure 2, in addition also only near ultraviolet band, Raman can thoroughly separate with fluorescence, not interfere with each other.
We make the result tested of 266nm laser and show, if Raman is in 268-302nm, fluorescence mainly after 350nm, in 302-
Though 350nm regions have overlap but serious, for the sake of pure, if we can not take spectrum using it as isolated area. use 213nm
Laser, Raman can thoroughly separate with fluorescence, can not set isolated area.
Ω is the Raman scattering solid angle that receiving aperture is collected, and it is made up of two parts, need to such as increase Ω, and one is object lens
Acceptance angle is big, and the Raman that target is produced is as much as possible to be collected；Two is that the acceptance angle of spectrometer wants big, as far as possible
Many Raman lights are sent to detector.Increasing the acceptance angle of object lens can use high-power microscope head, but distance typically can shorten, cannot
Direct measurement object, therefore low power microcobjective must be selected in portable or without microcobjective but using zoom or not zoom
Object lens；Increasing the acceptance angle of spectrometer can drop to 1.3 F numbers with all breath gratings of body from 4, but due to lacking optical material
It is difficult to make all breath gratings of qualified body in nearly deep ultraviolet 213nm or so, left can do is how to allow big and circle drawing
Through long and narrow slit to reduce loss of being in the light, the present invention adopts two kinds of solutions to graceful luminous point：One is to use tens light
The point that fibre is made turns the fibre bundle of line makes big and circle Raman luminous point match completely with long and narrow slit, and two is using virtual narrow
Stitch big and luminous point of circle is cut into several blocks of light for being combined into long and narrow similar slit again, thus can slit, so
It is virtual slit.The loss that although fibre bundle uses very convenient but light is more than virtual slit, but the optics of virtual slit
Structure is more complicated and not easy to install in spectrometer input, also there is shortcoming.S is the corresponding laser effective illuminated face of receiving aperture
Product, will increase irradiated area but remain to excite Raman, direct method to be to increase the power of laser and use short wavelength laser, but
In fact S also cannot change after laser is selected.
Although waiting in the Li Can academician of the Dalian Chemistry and Physics Institute of the dark purple outskirt Chinese Academy of Sciences of below 200nm and once using 177.3nm
Laser makes Raman spectrometer for the detection of catalyst, but is connected with three-level monochromator, and system is expensive greatly, and
Can only in a vacuum use, therefore the live indoor and outdoor detection not sampled cannot be done.United States Patent (USP) US7,933,013B2
“Detection of materials based on Raman scattering and laser-induced
Fluorescence by deep UV excitation " use the laser pair that wavelength is 222nm, 224nm, 226nm, 248nm
Nitro class explosive excites Raman, while the NO that the optics introduced using laser is crushed and optical resolution effect is produced is from excitation state
Go to produce fluorescence when returning to ground state, and this fluorescence spectrum is discrete and narrower therefore easier than the natural fluorescence that laser is produced
Detection explosive., using same principle by 209nm, 262nm, 282nm, 315nm laser is to per-compound explosive for they
The OH of generation goes to obtain discrete fluorescence Spectra.When Raman spectrum and fluorescence Spectra is taken, they are made without beam splitter but with a kind of mechanism
Go with the different time to take spectrum respectively into respective spectrometer before and after Raman and fluorescence, not only system complex, if laser is right
Targeted scans, Raman spectrum and fluorescence Spectra that different time is obtained may be from the different material of different scanning point, cannot melt in real time
Close, or even material cannot be differentiated.The natural fluorescence that actually laser is produced mixes with NO or OH fluorescence, and the former understands handle
The latter is flooded, and a kind of method is to reduce laser power, and predisposition luminescence is crushed and the laser energy of optical resolution is less demanding, on
Stating lower powered laser can be competent at, and the fluorescence of such NO or OH perhaps can be higher by natural fluorescence, but use these low-power
Laser deexcitation Raman, when distance a little further when it is hardly possible.Therefore patent US7,933,013B2 actually cannot be same
When obtain separate Raman and fluorescence spectrum.In addition, the patent does not have fibre bundle or virtual slit to go to increase the collection of Raman light
Ability, also goes to observe test point and whole target without laser or visual light imaging passage, and function is restricted, for example cannot be
The material in fingerprint is also measured while seeing stealthy fingerprint.
U.S. Patent application US2012/0145925A1 " Photofragmentation-laser-induced
Fluorescence for detection of nitric oxide-bearing explosives " also with 226nm or
The nearly deep ultraviolet lasers of 236nm go the fluorescence for obtaining optics crushing generation to go to detect nitro class explosive, but with optical filter Raman
It is less emerging system that therefore gear jail is not Raman spectrometer, and we are not discussed in detail.
United States Patent (USP) 7869031 " Latent prints detection using Raman imaging " proposition table
Face strengthens near-infrared or visible ray Raman spectrometer and surveys fingerprint, but first has to the fingerprint to be transferred to nano metal Jin, Silver, copper powder and do
Surface enhanced chip could survey, this be one be difficult work, stealthy fingerprint often cannot be realized, section enable transfer, refer to
Line is also more or less deteriorated, and suspect is rejected by evidence of crime acceptable as court；Surface enhanced chip is expensive
And unstable, produced surface-enhanced Raman is without repeatability. in addition, near-infrared or visible ray Raman because serious sunlight,
Ambient light and fluorescence interference at all cannot be in outdoor onsite applications, it is necessary to although fingerprint is adopted to laboratory could measure. they
Propose the idea but the thing without proposition specifically while taking pictures to fingerprint in measurement fingerprint that Raman is combined with fingerprint
The system architecture and embodiment of the Raman spectrum of matter, simply lists the Raman collection of illustrative plates for doing in some laboratories, claim
In also mainly say how fingerprint to be transferred to the design that Raman photothermal spectroscopic analyzer is not talked about on surface enhanced chip.Due to
Do not have to have in same laser channeling as the present invention can reflection laser again can be through the beam splitter of laser, therefore cannot be same
When obtain fingerprint as and dactylogram, the fluorescent image for also being produced using fingerprint certainly and fluorescence Spectra, i.e., without the present invention like that
Laser, Raman and the point-to-point emerging system of fluorescence triple channel, or even the system also do not taken pictures with uviol lamp oblique fire.
The present invention provides two kinds of embodiments, and the first is sharp using only the painting of 1%-10% regions is accounted at first piece of beam splitter center
Other 10%-99% regions of light highly reflecting films do not apply the design of laser reflective film and make swashing from target reflection
Light, Raman and fluorescence can enter relay optical system by the first beam splitter, then by second piece and three piece point
Beam device is separately again merged laser, Raman and fluorescence triple channel.Laser imaging passage can provide optical axis and laser is swept
The exact position of described point and focusing Qing Condition, it is easy to which system fills school and measurement, it is also possible to expand illumination fingerprint and obtain hidden under sunlight
Shape fingerprint is as (being not measure stealthy Zhi Pattern with visible ray)；And Raman can provide high-resolution spectrogram, fluorescence can provide Gao Ling
Sensitivity spectrogram, they learn from other's strong points to offset one's weaknesses, and complement each other, and the material in image can be measured, and it is micro that such as finger was contacted
Explosive, drugs, blood etc., so both can be with target image (such as having known that who is he), it is also possible to no from stealthy fingerprint
Quick (in the 1-2 seconds) of contact measures the material in image (thing for for example contacting from finger knows what crime he commits excesses).
Fingerprint can certainly be taken pictures with uviol lamp and then go out spectrum with Raman and fluorescence channel. second embodiment is with the first in light
The forward part of spectrometer is the same, and except for the difference that we do not use that grating makees dispersion element and ultraviolet enhancing area array CCD takes spectrum, and
It is to make dispersion and with highly sensitive single or multiple ultraviolet enhancing photomultipliers using liquid crystal or acousto-optic tunable filter
PMT or snowslide pipe APD take spectrum as detector, so, due to without slit, as long as Raman signal is sufficiently strong, just not having to sampled point
It is restricted, can be very big；If making detector with ICCD, it is possible to be not only imaged but also gone out spectrum, and obtained EO-1 hyperion, this is to detecting during fingerprint
Not only be imaged but also gone out compose it is highly beneficial.
Describe the present invention, the illustrative examples of the here present invention in detail below in conjunction with accompanying drawing and specific embodiment
It is not as a limitation of the invention and explanation is only used for explaining the present invention.
Embodiment 1
As shown in figure 1, it is 231nm, 266nm or other nearly DUVs 10 that Laser emission goes out wavelength, hot spot is ellipse, sends out
Scattered angle is also asymmetric in Chang Duan Shaft directions, so with the cylindrical mirror 20 of two pieces of different focals that laser shaping is circular for example straight
Footpath is that (if only with a cylindrical mirror shaping, light beam can first be assembled and dissipated afterwards, therefore with second for 1 millimeter or several millimeters of hot spot
Individual cylindrical mirror collimates it return), it reflexes to convergence Jing after beam-expanding collimation mirror 30 by the vibration mirror reflected microscope group 40 of X and Y-direction
Mirror 50, luminous point adjustable pinhole 60 is converged to, then be mapped to after being collimated by lens 70 noise suppressed beam-splitter (also cry dichroscope or
Beam splitting chip BS1) a diameter of 1 millimeter or several millimeters of 80 of central part 75, this region scribbles the highly reflecting films of backward-reflected laser, its handle
A diameter of 1 millimeter or several millimeters of laser reflection to certain diameter (such as 10mm) low power (such as 5 times) microcobjective (or become
Burnt or not zoom lens) 90 go to illuminate stealthy fingerprint (target) if 100. 90 are zoom lens and adjust the size of pin hole 60, can
Pin-hole imaging is changed up in fingerprint the distance of detection and the size of illumination region, this is to the laser fingerprint imaging passage side of bringing
Just. after fingerprint is taken pictures, pin hole is reduced, adjust zoom lens Laser Focusing on fingerprint a little by Raman and fluorescence channel
Take spectrum.
What cause incided microcobjective is the directional light that the angle of divergence is 2 θ, if laser is regarded as Gaussian beam, the waist of focusing
Spot size is unrelated with former laser emitting spot size, only relevant with the angle of divergence, if the focal length of microcobjective is f, focus point
Size is 2f θ, and principle is as follows:Gaussian beam is remained as after Gaussian Beam lens transmission, beam waist position and beam is simply changed
Waist radius.As Fig. 3 shows, the waist radius for being input into Gaussian beam is ω0, it is l away from distance from the lens, the focal length of lens is f, sharp
With Gaussian beam transmissive, output waist radius ω ' can be calculated0With apart from l ', they meet respectively below equation:
L=f+ [(1-f) f2]/[(1-f)2+(Πω0 2/λ)2] (3)
ω0 ’2=ω0 2/[(1-1/f)2+(Πω0 2/λ)2/f2] (4)
According to above-mentioned formula, we are can be found that if being input into the with a tight waist at the front focal plane of lens of Gaussian beam, i.e. l
During=f, export the with a tight waist of Gaussian beam and be then located at the back focal plane of lens, waist radius now is
ω0'=λ f/ Π ω0 (5)
Because half angle of divergence for being input into Gaussian beam approximately meets
θ=λ/Π ω0 (6)
It is obvious that for the Gaussian beam at lens front focal plane with a tight waist, its spot diameter at lens focal plane is expired
Foot
D=2f θ (7)
That is, in light path simulation, it is the light of infinity that can be approximately considered Gaussian beam, but is sent out with certain
Firing angle, concrete visible Fig. 4, the beam waist position for being now input into Gaussian beam is equivalent to the entrance pupil of optical system, and the angle of divergence is corresponding
The angle of visual field, minimum light spot is located on lens focal plane, and size meets above-mentioned formula.Laser output beam is Gaussian beam, and high
The propagation of this light beam Jing lens is different from plane wave.
As can be seen from the above analysis, beam-expanding collimation mirror can reduce the angle of divergence of laser instrument and cause Guang Ban Minus little, this
For we require that the larger system of irradiated area is not necessarily favourable, therefore we be able to will regard with or without beam-expanding collimation mirror
Depending on concrete condition.
Encountering the noise suppression by made by vitreous silica from target reflection, scattering and the laser for producing, Raman light and fluorescence
During beam-splitter 80 processed, though its center be 1 millimeter or several millimeters the reflection laser of region 75 because be beam splitting chip it can pass through
Raman light and fluorescence, if other regions scribble anti-reflection film and laser, Raman and fluorescence can be allowed all to pass through. center film area is 1 millimeter
Then laser light beam splitting chip BS1Region be up to (π 52-π0.52)/π52=24.75/25=99%, close full impregnated, it is this can
The design of backward-reflected laser and the saturating laser of energy is the original creation of the present invention.Through beam splitting chip BS180 laser, Raman and fluorescence encountering it is anti-
The logical beam splitting chip BS of second block length of laser2After 140, it instead arrives narrow band pass filter 150 by relay lens 160 in CCD laser
Into lasing image on camera 170, to see the illuminated laser spot in target and optical axis；If the size for adjusting pin hole 60 is used
Laser diffusion is gone whole (or a part of) target 100 of illumination by variable focal length lens 90, then laser channeling can pass through relay lens 160
To target imaging to 170, for example, stealthy fingerprint is shown, in the design CCD focal planes and objective plane are object-image relations, be not burnt
Point relation.Due to laser oblique illumination stealth fingerprint laser can be reflected away from minute surface direction obtain high-contrast fingerprint it is concavo-convex
Uneven texture image, we first can allow the laser for expanding to go tiltedly suitable angle of speculum 40 turn without needle passing hole
According to whole fingerprint, the light reflected from fingerprint is collected by object lens and is imaged on laser channeling 170. reflection can not certainly be rotated
The another uviol lamp 110 of mirror casts oblique rays on (adjustment azimuth and the angle of pitch) fingerprint 100 by narrow band pass filter 120, by subsidiary
Camera 130 is taken pictures or is imaged by laser channeling 170. after taking and shining, speculum 40 is gone back to origin-location with gathering from pin hole
To the illuminated with laser light fingerprint of target, reflection, scattering and the laser for producing, Raman light and fluorescence reach the to Jiao by the first beam splitting 80
Laser is reflected during two beam splitters 140, and the Raman light and fluorescence of transmission are meeting the 3rd piece of beam splitter BS3When 180, Raman light
It is reflected to narrow band pass filter 190 and is focused on by relay lens 200 and a little turns half that line fibre bundle 210 is connected to spectrometer 220
(or first) Xia Sew is in the ultraviolet intensified CCD of half (or a part of, such as 1024x128 picture dot of 1024x256 faces Array)
The Raman spectrum of upper print；Through the 3rd piece of beam splitter BS3180 fluorescence is mapped to narrow band pass filter 230 by relay lens 240
Focus on a little turn line fibre bundle 250 and be connected to another half (or second) narrow Sew of spectrometer 220 second half (an or part,
The 1024x128 picture dot of such as 1024x256 faces Array) ultraviolet intensified CCD on print fluorescence Spectra.This unique design
Method can make Raman and fluorescence channel share a spectrometer, greatly save cost.
If slit width is 0.05mm, Raman luminous point is typically big than it, and as shown in Figure 5, our available points turn the optical fiber of line
Beam is matched with slit；We can also become line with virtual slit circle luminous point, as shown in Figure 6.Inventor have developed one 50
The long-range near deep ultraviolet Raman spectrometer of explosive is detected under the outer sunlight of rice, as shown in Figure 7a, at 50 meters explosive is projected outward
On laser be a big ellipse, the spot size after object lens are assembled is about 0.55mmx1.3mm=0.7mm2.We use 70
The fibre bundle that the optical fiber of a diameter of 0.1mm of root is constituted becomes a 0.1mmx7mm=0.7mm oval spot2With slit
The light (see Fig. 7 b) matched somebody with somebody, just matches with the CCD focus planardetectors of the 1024x512 that picture dot size is 13.5 microns, because
Detector size for vertical direction is 13.5 μm of x512=7mm, and slit is also 7mm.The use that point turns line fibre bundle is not only big
Throughput is improve greatly, and also allows for being connected as optics with slit with fibre bundle Sui meanings.
The output of this three roads light point-to-point in real time on data processing and the calculating of identifying system 260 can be carried out
Fusion.Although fluorescence spectrum is more very different than the resolution ratio of Raman spectrum, sensitivity is much higher, therefore to detecting trace target
Can be helpful.The energy of nearly deep ultraviolet laser is very high can to produce NO (nitric oxide) and OH (hydroxyl) with decomposition explosion product,
Their fluorescence spectrum is discrete, and can separate with the wide fluorescence spectrum of other materials, therefore may detect Raman to visit
The micro vestige of explosive for measuring.System is also equipped with GPS location and radio data-transmission equipment.
Generally speaking, three beam splitting chip BS have very high transmitance to Raman and fluorescence, problem be ultraviolet object lens whether
Can saturating Raman and fluorescence.We come consider laser be 266nm situation (situation of other nearly deep ultraviolet lasers is also similar), figure
8 is its transmittance curve, and its Raman to 268-290nm has very high transmitance, to the average of the fluorescence of 350-500nm
Rate is crossed also more than 75%, is entirely capable of meeting the requirement of triple channel fusion.
Fig. 9 is the ray tracing result from laser to focal length microcobjective, it is shaped after be originally 4:1 ellipse garden hot spot
(2mmx0.5mm) become the circular light spot of a diameter of 0.13mm, thus repeated optical beam-expanding to a diameter of 0.44mm, (area is
0.15mm2) hot spot after can be imaged onto and a little turn line fibre bundle head and be coupled to 3mmx0.05mm (area is 0.15mm2) it is narrow
Sew on, the ultraviolet intensified CCD that now spectrometer is used is the face battle array of 1024x256, picture dot size is 13.5 μ.
Using two kinds of methods to Sample Scan, the first is swept as two-dimension optical with a pair of speculum galvanometers 40 to the present invention
Retouch, because of fingerprint very little, as long as the first beam splitter and object lens are sufficiently large can be achieved with；Second is that whole head is made into two-dimentional machinery
Scanning.
Embodiment 2
Though above-mentioned design can quickly go out spectrum, because the whole target of sensing point very little inspection will make two-dimensional scan and time
Longer, in addition CCD is also not high enough in ultraviolet sensitivity in spectrometer.To overcome these shortcomings, we make dispersion without grating
Element and CCD, use Tunable filters and highly sensitive photomultiplier PMT or avalanche photodide APD instead.It excellent
Point is that sensitivity is very high, without slit, the size of sensing point is not limited；Its shortcoming is that spectrum wants one ripple of a wavelength
Long scanning is completed, therefore it is slower to take the speed of spectrum, if but it can to obtain EO-1 hyperion laser to whole target imaging stronger
And if imaging charge-coupled image sensor ICCD.
Figure 10 is the nearly deep ultraviolet Raman spectrum of use Tunable filters of the present invention and PMT or APD detectors
The theory diagram of instrument.It is the same in the forward part and embodiment 1 of spectrometer, except for the difference that this system does not have the light of grating dispersion
Spectrometer and Narrow Sew., when second piece of beam splitter 140 is encountered, shorter laser is reflected to 170 one-tenth for laser, Raman light and fluorescence
Picture, but allow Raman light and fluorescence to pass through, when the 3rd piece of beam splitter 180 is encountered, shorter Raman light is reflected but allows fluorescence to lead to
Cross；Raman light Jing Tunable filters 190 and imaging len 200 are imaged onto on the PMT 210 of detection Raman spectrum, and fluorescence Jing can
Tuning filter 220 and imaging len 230 are imaged onto on the APD 240 of detection fluorescence spectrum；If detector is to use photomultiplier transit
The imaging CCD of pipe is ICCD, then can be EO-1 hyperion while print is composed by fingerprint imaging. the output of this three roads light can
It is point-to-point in real time on data processing and the calculating of identifying system 250 to be merged and sent.
In order to verify embodiment 1 and 2, we have built triple channel experimental provision with 266nm laser, and Figure 11 a are that laser leads to
Road into the picture that stays on aluminium pot of stealthy thumb, Figure 11 b are the various materials in the stealthy thumb that Raman passage is measured.
The technical scheme for being provided the embodiment of the present invention above is described in detail, specific case used herein
The principle and embodiment of the embodiment of the present invention are set forth；Meanwhile, with reference to claims, according to present invention teach that
The equivalent obtained with enlightenment and modification are all within protection scope of the present invention.
Claims (7)
1. a kind of scene stealth fingerprint shows and its internal substance measuring instrument, it is characterised in that：It includes the nearly depth being sequentially connected
Ultraviolet lasing device, laser spot shaper, laser bundle-enlarging collimation device, two-dimensional scan speculum, the first beam splitter, zoom or
Varifocus objective, the second beam splitter, the 3rd beam splitter, relay optical system, point do not turn line optics system, sweep into spectra system, sample
System, data handling system, GPS location and data wireless transceiver system are retouched, and further includes additional ultraviolet irradiation lamp
And camera；The mid portion 1-10% regions of the quartz glass substrate of the first described beam splitter apply the highly reflecting films of laser,
But the saturating Raman of this film and fluorescence, and remaining 90-99% region applies saturating laser, Raman, anti-reflection film of fluorescence, therefore make first point
Beam device not only backward-reflected laser but also saturating laser；The described saturating Raman of the second beam splitter backward-reflected laser and fluorescence；The 3rd described beam splitter reverse drawing
Graceful fluorescence；Described relay optical system, the illumination point reflection from target, scattering and the photoimaging for producing to fibre bundle
Head；Described point turns line optics system, relay optical system into point as or line picture be converted into slit shape and with light
Spectrometer numerical aperture matches；It is described to include using grating and ultraviolet intensified CCD into spectra system, and Tunable filters and
Two kinds of photomultiplier or snowslide pipe；Described two-dimensional scan speculum and the adjustable azimuth of ultraviolet irradiation lamp and the angle of pitch with
Oblique fire angle obtain stealthy fingerprint as；Described specimen scanning system includes 2-D optical scanning or mechanical scanning to whole sample
Pointwise takes spectrum；Described data handling system by Raman, fluorescence, the point-to-point real time fusion of laser triple channel, and make spectrum show,
Spectrum is separated, crest is positioned, spectrum storehouse is set up, Object Classification process, then by GPS location and data wireless transceiver system,
Data are wirelessly transmitted to the database of public security bureau and compare.
2. stealth fingerprint in scene according to claim 1 shows and its internal substance measuring instrument, it is characterised in that：Described
The wavelength of ultraviolet irradiation lamp is 200-380nm, and it can cast oblique rays on fingerprint with adjustment angle makes background light fall from Specular reflection, but
Rough fingerprint reflected light and the fluorescence laser channeling imaging of described camera or Raman spectrometer for exciting are made, is carried
High-contrast.
3. stealth fingerprint in scene according to claim 1 shows and its internal substance measuring instrument, it is characterised in that：Described
Two-dimensional scan speculum is the galvanometer of X and Y-direction, and adjustable angle casts oblique rays on fingerprint makes laser background fall from Specular reflection but make recessed
Convex uneven fingerprint is imaged in the laser channeling of Raman spectrometer, improves contrast；And make two-dimensional scan pointwise to sample and take spectrum.
4. stealth fingerprint in scene according to claim 1 shows and its internal substance measuring instrument, it is characterised in that：Described
Nearly deep ultraviolet laser wavelength is 200-270nm, and described Raman light sets with fluorescence bands depending on laser instrument and system used
The requirement of meter, not overlap as principle.
5. stealth fingerprint in scene according to claim 1 shows and its internal substance measuring instrument, it is characterised in that：Described
Point turns line optics system includes that point turns line fibre bundle or virtual slit, and described point turns line fibre bundle and is made up of circle multifiber
Luminous point becomes shape of slit, and circle luminous point is cut into after several pieces of reshapings and is combined into long and narrow shape of slit by described virtual slit
Light.
6. stealth fingerprint in scene according to claim 1 shows and its internal substance measuring instrument, it is characterised in that：Described
Measuring instrument makes Raman and fluorescence channel share a spectrometer.
7. stealth fingerprint in scene according to claim 1 shows and its internal substance measuring instrument, it is characterised in that：Described
Fluorescence cutoff wavelength is higher by 100-200 nanometers than expected Raman light cutoff wavelength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510868921.4A CN105388140B (en) | 2015-12-01 | 2015-12-01 | Measuring instrument for site invisible fingerprint display and contained substance thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510868921.4A CN105388140B (en) | 2015-12-01 | 2015-12-01 | Measuring instrument for site invisible fingerprint display and contained substance thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105388140A CN105388140A (en) | 2016-03-09 |
| CN105388140B true CN105388140B (en) | 2017-05-10 |
Family
ID=55420672
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510868921.4A Active CN105388140B (en) | 2015-12-01 | 2015-12-01 | Measuring instrument for site invisible fingerprint display and contained substance thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105388140B (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106596420B (en) * | 2017-01-19 | 2023-07-04 | 中国科学院上海技术物理研究所 | Ultra-large-breadth high-resolution imaging system and imaging method |
| CN107478550A (en) * | 2017-09-21 | 2017-12-15 | 湖北省天门市鹰飞拓检测仪器有限公司 | The triple channel emerging system of real-time detection of particles size and property |
| CN109556997A (en) * | 2017-09-26 | 2019-04-02 | Ravr有限公司 | The triple channel emerging system of real-time detection particle size and property |
| CN115078319A (en) * | 2018-06-27 | 2022-09-20 | 因纽美瑞克斯公司 | Light sheet fluorescence microscopic imaging device for transparentizing liquid drop imaging and detection method |
| CN108627495B (en) * | 2018-06-28 | 2020-07-07 | 上海氘峰医疗器械有限公司 | Fixed wavelength Raman scattering rapid acquisition and imaging device |
| CN110175494A (en) * | 2018-07-06 | 2019-08-27 | 神盾股份有限公司 | Optical finger print sensing device |
| CN109211855B (en) * | 2018-08-10 | 2021-11-16 | 国家纳米科学中心 | Multi-beam multi-photon microscopic imaging device |
| CN110161374A (en) * | 2019-06-18 | 2019-08-23 | 苏州微纳激光光子技术有限公司 | A kind of day blind ultraviolet imagery background Xanthophyll cycle optical system and method |
| CN112014965A (en) * | 2020-10-22 | 2020-12-01 | 南京诺源医疗器械有限公司 | Visible-near infrared real-time image fusion fluorescence microscope system |
| CN112987949B (en) * | 2021-03-12 | 2023-08-11 | 华能伊敏煤电有限责任公司 | Concealed fingerprint identification mouse |
| CN114002146A (en) * | 2021-06-02 | 2022-02-01 | 杭州赫太克科技有限公司 | Three-probe patrol instrument |
| WO2022261781A1 (en) * | 2021-06-18 | 2022-12-22 | Ember Katie | Methods and systems for interrogating a drop of saliva using raman spectroscopy |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103364386A (en) * | 2012-03-27 | 2013-10-23 | 武汉鹰飞拓光电子有限公司 | Deep ultraviolet laser Raman spectrometer |
| CN204807463U (en) * | 2015-03-19 | 2015-11-25 | 上海市刑事科学技术研究院 | Material evidence original inspection platform system |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2621294Y (en) * | 2003-06-09 | 2004-06-23 | 刘兰平 | Ultraviolet scope |
| US20100291599A1 (en) * | 2009-05-18 | 2010-11-18 | Bruker Optics, Inc. | Large area scanning apparatus for analyte quantification by surface enhanced raman spectroscopy and method of use |
| CN102156119B (en) * | 2011-05-06 | 2012-11-21 | 东北师范大学 | Method for detecting potential information in fingerprints by utilizing Raman spectrum |
| CN102297854B (en) * | 2011-05-23 | 2013-10-02 | 公安部第一研究所 | High-efficiency multi-mode laser-induced fluorescence optical path exciting system |
| CN103091299B (en) * | 2013-01-21 | 2015-01-21 | 北京理工大学 | Laser differential confocal map microimaging imaging method and device |
| DE102013017649B4 (en) * | 2013-10-23 | 2023-08-17 | Leibniz-Institut für Oberflächenmodifizierung e.V. | Method and measuring device for the chemical-analytical examination of an impression of a skin surface |
-
2015
- 2015-12-01 CN CN201510868921.4A patent/CN105388140B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103364386A (en) * | 2012-03-27 | 2013-10-23 | 武汉鹰飞拓光电子有限公司 | Deep ultraviolet laser Raman spectrometer |
| CN204807463U (en) * | 2015-03-19 | 2015-11-25 | 上海市刑事科学技术研究院 | Material evidence original inspection platform system |
Non-Patent Citations (1)
| Title |
|---|
| 《Ultraviolet Fluorescence Imaging of Fingerprints》;Naoki Saitoh etal;《THE SCIENTIFIC WORLD JOURNAL》;20061231;第2006卷(第6期);691-699页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105388140A (en) | 2016-03-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105388140B (en) | Measuring instrument for site invisible fingerprint display and contained substance thereof | |
| CN105258800B (en) | Portable three-channel near-deep-UV Raman spectrometer | |
| US10209195B2 (en) | Device for collecting surface-enhanced Raman scattering spectrum using full-aperture-angle parabolic mirror | |
| CN103364386B (en) | Deep ultraviolet laser Raman spectrometer | |
| CN103743719B (en) | Planetary surface material and air remote in-situ integrated test system | |
| US10794764B2 (en) | Double-channel miniaturized Raman spectrometer | |
| US4022529A (en) | Feature extraction system for extracting a predetermined feature from a signal | |
| CN103487146B (en) | Ultra wide band stimulated raman spectroscopy microscopic imaging system simple and convenient to use | |
| CN105784682A (en) | Detection device and detection method by laser induced breakdown spectroscopy | |
| CN108717057A (en) | A kind of portable surface enhancing Raman spectrometer and its measurement method | |
| WO2017065257A1 (en) | Imaging apparatus, flow cytometer, and imaging method | |
| CN107167456A (en) | Transmission-type differential confocal CARS micro-spectrometer method and devices | |
| CN202533371U (en) | Deep ultraviolet (DUV) laser Raman spectrometer | |
| CN106198490B (en) | Space offset Raman spectrum detection system | |
| CN106370642A (en) | Portable Raman spectrometer specially for detecting foods and drugs | |
| USRE32598E (en) | Feature extraction system for extracting a predetermined feature from a signal | |
| CN105675581B (en) | A kind of free space gas Raman scattering collection device | |
| US10663393B2 (en) | Spectrum inspecting apparatus | |
| CN104990908B (en) | The confocal induced breakdown Raman spectrum imaging detection method of laser twin shaft and device | |
| CN107478332A (en) | A kind of burnt longitudinal high-resolution imaging device of annular beam copolymerization | |
| CN215606350U (en) | Imaging system | |
| CN214583656U (en) | Handheld common-caliber imaging spectrometer for prism light splitting | |
| JPS5919305B2 (en) | Fluorescence spectrophotometer | |
| CN108007570A (en) | Spectrometer and spectral detection system | |
| CN115307569A (en) | Dual-band detection-based dual-axis spectral line confocal sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 311223, Zhejiang City, Hangzhou province Xiaoshan District Nanyang Street Economic and Technological Development Zone on the west side of Yangcheng Avenue Applicant after: CRRC Hangzhou Co., Ltd. Address before: 311223, Zhejiang City, Hangzhou province Xiaoshan District Nanyang Street Economic and Technological Development Zone on the west side of Yangcheng Avenue Applicant before: HANGZHOU CSR URBAN RAIL TRANSPORT VEHICLES CO., LTD. |
|
| CB03 | Change of inventor or designer information |
Inventor after: Yu Shenwei Inventor after: Zhao Hua Inventor after: Zhang Youwen Inventor before: Zhang Youwen |
|
| COR | Change of bibliographic data | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |