CN102519936A - Detection apparatus for contraband based on Raman spectral analysis technique - Google Patents
Detection apparatus for contraband based on Raman spectral analysis technique Download PDFInfo
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- CN102519936A CN102519936A CN2011104375968A CN201110437596A CN102519936A CN 102519936 A CN102519936 A CN 102519936A CN 2011104375968 A CN2011104375968 A CN 2011104375968A CN 201110437596 A CN201110437596 A CN 201110437596A CN 102519936 A CN102519936 A CN 102519936A
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Abstract
The invention relates to a detection apparatus for contraband based on the Raman spectral analysis technique. The detection apparatus comprises a laser, an optical probe, a micro-spectrometer and a data acquisition and analysis processing system; the optical probe is a box which has a light inlet hole, a light outlet hole and a detection end, and a reflector, a dichroic beam combiner, condenser lenses and a long wave pass filter are provided in the box; laser light emitted by the laser is reflected by the reflector and the dichroic beam combiner after entering from the light inlet hole and then enters into a detection object arranged on the detection end after transmitted by one condenser lens, stimulated radiant light emitted by the detection object is transmitted by the condenser lens and the dichroic beam combiner, and light beams passing through the filter are focused by another condenser lens and enter into an interface terminal of the micro-spectrometer through the light outlet hole. Optical paths of the detection apparatus for contraband in the invention are simply arranged and have high efficiency and small loss; the detection apparatus is applicable to detection objects of various sizes and forms and has the advantages of low cost, strong resistance to interference, good stability, a small volume and convenient usage.
Description
Technical field
The present invention relates to field of spectral analysis technology, be specifically related to a kind of contraband goods pick-up unit that is applied to the safety check field.
Background technology
Spreading unchecked of drugs not only endangered human beings'health, and destroys the social security and the economic development of country, become serious international public hazards.In February, 1991; The United Nations's special meeting of banning taking addictive drugs is first pointed out; See that from the social and economic development angle it endangers greater than AIDS and desertification, " worldwide drug trafficking and addiction has become a big problem that influences everyone and international peace and security is constituted a threat to day by day ".Since 1969, the terrorist bombings on the aircraft has seized people's life more than 2000.In recent years the liquid explosive that occurs is easy to camouflage and carries, and explosive force is huge, wears fuselage if will explode, and only needs the liquid bomb of half cigarette package size just can.Korea S's passenger plane case of explosion in 1987, London in 2005 7/7 case of explosion that makes a stir all over the world causes 56 people to die, and it is injured to exceed 700 people, is the most serious in history attack of terrorism of Britain.The harm of contraband goods such as drugs, explosive is serious day by day, and some traditional inspection means are powerless, and Raman spectrum analysis method is a kind of good detection means.
Nineteen twenty-eight India physicist Raman is found Raman scattering effect (promptly being changed by the light occurrence frequency of molecular scattering when light passes transparent medium) first, and therefore wins the nineteen thirty Nobel Prize in physics.After Ramam effect was found, Raman spectrum analysis once was the main means of research molecular structure; The sixties, the appearance and the technological development of Testing of Feeble Signals of LASER Light Source brought new opportunity for the Raman spectrum analysis technology.The mid-1970s, the appearance of laser raman microprobe has been injected vigor to micro-zone analysis.Since the eighties, the appearance of depression wave filter has substituted duplex monochromator even triplicate form look device, has improved source efficiency greatly, reduces incident optical power, the sensitivity that has improved spectrometer.In recent years, Raman spectroscopy has developed into confocal microscopy Raman technology, surface enhanced raman technique, resonance raman technology etc., has formed the technical system in Raman spectrum analysis field.
The Raman spectrum analysis technology is to be the molecular structure characterization technology that the basis is set up with the Ramam effect, and its signal derives from the vibration and the rotation of molecule.Therefore the different materials spectrum that takes on a different character can do qualitative analysis through Raman spectrum; The characteristics strong and weak according to the substance spectra Raman scattering can be done quantitative test to material; To the analysis of Raman spectrum bands of a spectrum, material functional group can be carried out and molecular structure performs an analysis.Just because of this; The laser Raman spectroscopy technology has all obtained using widely in material evaluation, molecular structure research, chemical process, medical science medicine, biological chemistry, archaeology and every field such as jewel evaluation, public security and science of law sample analysis, anti-terrorism technology, food security, geology and environmental science, more and more receives researcher's attention.Particularly the laser Raman spectroscopy analytical technology need not the specimen preparation process, is the lossless detection technology, is fit to WS analysis, the fast stability height of speed, progressively begins to use in anti-terrorism prohibition of drug field.
Raman spectroscopy has the advantages such as detection that noncontact, detection speed are fast, be applicable to all kinds of solvents, has been widely used in fields such as physics, chemistry, material science at present.In the safety check field, be mostly chemical solvents such as alcohol, gasoline owing to detect target, therefore through Measurement and analysis, can realize the quick nondestructive of common contraband goods is detected to its Raman spectrum.But at present to the occasion of crowded public place, some pick-up unit can't adaptation form, detection target not of uniform size and obtain quick testing result; Then anti-interference is poor for some, a little less than the stability, detects accurately inadequately, and some volume is big, is not easy to use.
Summary of the invention
In view of this, in order to overcome the deficiency of prior art, the present invention provides a kind of safety check that is applicable to that all size, form detect target to use the raman detection device, its compact conformation, measures convenient, strong interference immunity, and cost is low.
A kind of contraband goods device for fast detecting provided by the invention based on Raman spectrometer; Comprise laser instrument, optic probe, micro spectrometer, data acquisition and analysis process system, said optic probe is the casing with light well, light hole and end of probe, and said light well links to each other with laser instrument; Said light hole links to each other with spectrometer; Said end of probe is placed and is detected object, and catoptron, dichroic mirror, condenser and long pass filter are set in the said casing, from laser that laser instrument sends from light well after catoptron and dichroic mirror reflects; Be positioned over the detection object of end of probe again through the condenser irradiation; From detecting the excited radiation light that object sends, after condenser and dichroic mirror transmission, the Reyleith scanttering light of long pass filter filtering of warp and exciting light same frequency again; The light beam that passes optical filter focuses on through another condenser again, injects the interface end of micro spectrometer from light hole.
Further, said optic probe also comprises beam expanding lens group and narrow band pass filter, and the light beam of said laser emitting is behind beam expanding lens group and narrow band pass filter, again through said catoptron and dichroic mirror reflects.
Further, said catoptron and said dichroic mirror laterally arrange, and the incident laser light beam is with 30 ° of incident angle toward mirror faces.
Further, said laser instrument is diode pumped solid state laser or semiconductor laser.
Further, said laser instrument emission wavelength is 400～900nm.
Further, said laser instrument, optic probe, micro spectrometer, data acquisition and analysis process system place same casing.
Further, said micro spectrometer adopts CCD type detection array.
Further, said signals collecting and analysis process system adopt embedded computer system.
Further, the output signal of said micro spectrometer is connected to the data collection and analysis disposal system.
Detect target during measurement and directly be positioned over the end of probe that probe is set, through carrying out real-time comparative analysis, thereby realize the quick nondestructive of contraband goods is detected to the collection of its raman spectral signal, processing and with spectra database.
Contraband goods device for fast detecting of the present invention is the basis with the Raman spectroscopy, can be used for the inspection of common contraband goodss such as liquid towards explosive, drugs, hazardous chemical.
Said laser instrument adopts wavelength lower powered diode pumped solid state laser in visible light or nearly red sector, is low-power semiconductor pump laser, 785nm laser instrument etc. among the 671nm like wavelength.
Said optic probe is one to have the casing of light well, light hole and end of probe, and light well links to each other with spectrometer with laser instrument respectively with light hole, and object (like bottling liquid) is positioned over end of probe.Laser from laser instrument sends shines the detection object that is positioned over end of probe behind catoptron, dichroic mirror and condenser.From the excited radiation light that object sends, behind condenser and dichroic mirror, through the Reyleith scanttering light of long pass filter filtering and exciting light same frequency, the light beam that passes optical filter focuses on the interface end of micro spectrometer again through condenser.The output signal of micro spectrometer is connected to the data collection and analysis disposal system.
Said micro spectrometer is for adopting the CCD type detection array of mature technology.
Said signals collecting and analysis process system adopt embedded computer system.Through the object sample spectral data is carried out pre-service, and set up the Raman analysis computation model in real time, thereby improve detection speed greatly.Can in 10 seconds, discern object sample to be measured.
Used analytical calculation software is the basis with known sample Raman spectrum data storehouse, and the binding pattern sorting technique can be identified identification in real time to sample.
Beneficial effect of the present invention is:
1. contraband goods device for fast detecting provided by the invention, because lower powered semiconductor solid state laser in the laser instrument employing, micro spectrometer adopts CCD type detector array, makes instrument cost under the prerequisite that guarantees the detection performance reduce greatly.
2. contraband goods device for fast detecting provided by the invention, machine system does not have movable member, strong interference immunity, good stability, volume is little, and in light weight, low in energy consumption, "dead", not influenced by ambient lighting, easy to use.
3. contraband goods device for fast detecting provided by the invention is applicable to the evaluation identification of safety check field to common contraband goods, is specially adapted to light transmission liquid phase object detection preferably.
4. contraband goods device for fast detecting provided by the invention is applicable to the detection target of all size, form, detects object and can detect as long as can arrive through the laser beam of condenser.
5. contraband goods device for fast detecting provided by the invention, its light path be provided with simply, efficient, loss is little.
Description of drawings
Fig. 1 is the one-piece construction synoptic diagram that the present invention is based on the contraband goods pick-up unit of Raman spectrum analysis technology;
Fig. 2 is the optic probe structural representation that the present invention is based on the contraband goods pick-up unit of Raman spectrum analysis technology;
Fig. 3 is the Raman spectrogram that the present invention is based on the contraband goods pick-up unit measurement gained alcohol of Raman spectrum analysis technology;
Wherein: 1-laser instrument, 2-optic probe, 3-micro spectrometer, 4-data collection and analysis disposal system; 5-detects object, and 6 is the beam expanding lens group, and 7 is narrow band pass filter; 8 is catoptron, and 9 is dichroic mirror, and 10 is the condenser group; 11 are long pass filter, and 12 is the condenser group, and 13 is the micro spectrometer interface end.
Embodiment
Combine accompanying drawing that the present invention is done further explain at present.
With reference to figure 1, be structural representation of the present invention.Wherein be laser instrument 1, be optic probe 2.Optic probe is one to have the structure of light well, light hole and end of probe, and wherein light well links to each other with laser instrument, and light hole links to each other with micro spectrometer.During measurement, detect the end of probe that object 5 directly is positioned over optic probe.Detecting object such as liquid phase object need deposit in the transparent glass or plastic containers.After expanding bundle, turnover, shine the object that be positioned over end of probe after 2 secondary reflections through catoptron and dichroic mirror and the condenser focusing from laser beam that laser instrument sends.Excited radiation light from object sends behind the Reyleith scanttering light of dichroic mirror and long pass filter filtering and exciting light same frequency, focuses on the interface end of micro spectrometer 3 through the condenser at light hole place.The output signal of micro spectrometer is connected to data collection and analysis disposal system 4.After the data collection and analysis disposal system is carried out pre-service to the Raman spectrum data of object to be detected, again through with system in build spectrum library funtcional relationship discern evaluation.The present invention places laser instrument, optic probe, micro spectrometer and data collection and analysis disposal system in the same casing.During measurement, object directly is placed on casing one sidelight and learns the probe detection end.Whole device has advantages such as cost is low, volume is little, quick measurement.
With reference to figure 2, be the structural representation of optic probe of the present invention.6 is the beam expanding lens group, and 7 is narrow band pass filter, and 8 is catoptron, and 9 is dichroic mirror, and 10 is the condenser group, and 11 are long pass filter, and 12 is the condenser group, and 13 is the micro spectrometer interface end.Behind beam expanding lens group 6 and narrow band pass filter 7, reflex to main optical path from the light beam of laser emitting, focus on by condenser group 10 again and detect on the object through catoptron 8 and dichroic mirror 9.Require catoptron 8 and dichroic mirror 9 keeping parallelisms, the incident laser light beam is with 30 ° of toward mirror faces.Condenser 10 is simultaneously also as the excited radiation light of collecting lens collimation from object, and the excited radiation light behind the collimation focuses on spectrometer interface end 8 by condenser group 10 behind dichroic mirror 9 and long pass filter 11.The light that object sends comprises three parts: Raman signal, fluorescence and Rayleigh scattering light.Dichroic mirror is used to reflect exciting light, excited radiation in transmission light.Long pass filter selects for use average transmission rate to the Raman light signal greater than 90%, and to the dough softening of Reyleith scanttering light greater than the OD6 optical filter of (OD6 refers to that after long pass filter filtered, its light intensity was reduced to the 10-6 of former light intensity), to improve the precision of pick-up unit.
With reference to figure 3, be to adopt apparatus of the present invention to measure resulting Raman spectrogram, to compare and can know with the collection of illustrative plates of building in the system in the spectrum library, institute's detection material is an alcohol.
Claims (9)
1. the contraband goods pick-up unit based on the Raman spectrum analysis technology comprises laser instrument, optic probe, micro spectrometer, data acquisition and analysis process system, it is characterized in that; Said optic probe is the casing with light well, light hole and end of probe; Said light well links to each other with laser instrument, and said light hole links to each other with spectrometer, and said end of probe is placed and detected object; Catoptron, dichroic mirror, condenser and long pass filter are set in the said casing; From laser that laser instrument sends from light well after catoptron and dichroic mirror reflects, be positioned over the detection object of end of probe again through the condenser irradiation, from detecting the excited radiation light that object sends; After condenser and dichroic mirror transmission; Through the Reyleith scanttering light of long pass filter filtering and exciting light same frequency, the light beam that passes optical filter focuses on through another condenser again, injects the interface end of micro spectrometer from light hole again.
2. according to the described contraband goods pick-up unit of claim 1 based on the Raman spectrum analysis technology; It is characterized in that; Said optic probe also comprises beam expanding lens group and narrow band pass filter; The light beam of said laser emitting is behind beam expanding lens group and narrow band pass filter, again through said catoptron and dichroic mirror reflects.
3. according to the described contraband goods pick-up unit based on the Raman spectrum analysis technology of claim 1, it is characterized in that said catoptron and said dichroic mirror laterally arrange, said laser beam is with 30 ° of incident angle toward mirror faces.
4. according to the described contraband goods pick-up unit of claim 1, it is characterized in that said laser instrument is diode pumped solid state laser or semiconductor laser based on the Raman spectrum analysis technology.
5. according to the described contraband goods pick-up unit of claim 1, it is characterized in that said laser instrument emission wavelength is 400～900nm based on the Raman spectrum analysis technology.
6. according to the described contraband goods pick-up unit of claim 1, it is characterized in that said laser instrument, optic probe, micro spectrometer, data acquisition and analysis process system place same casing based on the Raman spectrum analysis technology.
7. according to the described contraband goods pick-up unit of claim 1, it is characterized in that said micro spectrometer adopts CCD type detection array based on the Raman spectrum analysis technology.
8. according to the described contraband goods pick-up unit of claim 1, it is characterized in that said signals collecting and analysis process system adopt embedded computer system based on the Raman spectrum analysis technology.
9. according to the described contraband goods pick-up unit of claim 1, it is characterized in that the output signal of said micro spectrometer is connected to the data collection and analysis disposal system based on the Raman spectrum analysis technology.
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Cited By (13)
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| CN103776813A (en) * | 2014-01-27 | 2014-05-07 | 公安部第一研究所 | Dangerous cargo long distance detecting device based on Raman spectrum analysis technology |
| CN103822910A (en) * | 2012-11-16 | 2014-05-28 | 福州高意通讯有限公司 | Raman probes for miniature Raman spectrometer |
| CN104020153A (en) * | 2014-06-16 | 2014-09-03 | 中国农业大学 | Raman spectrum detection system and method |
| CN104749162A (en) * | 2015-04-17 | 2015-07-01 | 江苏天瑞仪器股份有限公司 | Confocal Raman spectrometer and light path device thereof |
| CN104777150A (en) * | 2015-04-20 | 2015-07-15 | 中国计量学院 | Portable light filter type Raman spectrometer for measuring protein adulteration in milk or milk powder |
| CN104865279A (en) * | 2014-02-26 | 2015-08-26 | 清华大学 | Customs supervision item rapid-inspection equipment and method |
| CN105637333A (en) * | 2013-06-16 | 2016-06-01 | 乌尔里克·梅里尔德·尼尔森 | Detection of indications of psychoactive components in a liquid |
| CN106895920A (en) * | 2017-04-19 | 2017-06-27 | 重庆师范大学 | A kind of new Raman signal recurring structure |
| CN107238595A (en) * | 2017-05-05 | 2017-10-10 | 浙江大学 | The alcohol concentration measurement apparatus and measuring method of closed vessel |
| CN108885168A (en) * | 2018-06-12 | 2018-11-23 | 深圳达闼科技控股有限公司 | A kind of detection system and signal enhancing device |
| CN110443301A (en) * | 2019-08-02 | 2019-11-12 | 成都理工大学 | A kind of liquid dangerous material recognition methods based on the double-deck tagsort |
| CN112525886A (en) * | 2020-12-07 | 2021-03-19 | 上海新产业光电技术有限公司 | Raman spectrum device |
| EP4137800A1 (en) * | 2021-08-16 | 2023-02-22 | Endress+Hauser Optical Analysis, Inc. | Spatially offset raman probe with coaxial excitation and collection apertures |
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| CN106895920A (en) * | 2017-04-19 | 2017-06-27 | 重庆师范大学 | A kind of new Raman signal recurring structure |
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| CN110443301A (en) * | 2019-08-02 | 2019-11-12 | 成都理工大学 | A kind of liquid dangerous material recognition methods based on the double-deck tagsort |
| CN112525886A (en) * | 2020-12-07 | 2021-03-19 | 上海新产业光电技术有限公司 | Raman spectrum device |
| EP4137800A1 (en) * | 2021-08-16 | 2023-02-22 | Endress+Hauser Optical Analysis, Inc. | Spatially offset raman probe with coaxial excitation and collection apertures |
| US11913834B2 (en) | 2021-08-16 | 2024-02-27 | Endress+Hauser Optical Analysis, Inc. | Spatially offset Raman probe with coaxial excitation and collection apertures |
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Application publication date: 20120627 |