CN106442379A - Back laser device for detecting long-distance dangerous articles based on THz waves - Google Patents
Back laser device for detecting long-distance dangerous articles based on THz waves Download PDFInfo
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- CN106442379A CN106442379A CN201610879457.3A CN201610879457A CN106442379A CN 106442379 A CN106442379 A CN 106442379A CN 201610879457 A CN201610879457 A CN 201610879457A CN 106442379 A CN106442379 A CN 106442379A
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- laser
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- dorsad
- reflecting mirror
- thz wave
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- 238000001514 detection method Methods 0.000 claims abstract description 25
- 239000007789 gas Substances 0.000 claims description 12
- 238000005491 wire drawing Methods 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 6
- 230000007613 environmental effect Effects 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 4
- 230000003111 delayed effect Effects 0.000 claims description 3
- 239000013078 crystal Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000001328 terahertz time-domain spectroscopy Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 240000008067 Cucumis sativus Species 0.000 description 1
- 235000010799 Cucumis sativus var sativus Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- VIKNJXKGJWUCNN-XGXHKTLJSA-N norethisterone Chemical compound O=C1CC[C@@H]2[C@H]3CC[C@](C)([C@](CC4)(O)C#C)[C@@H]4[C@@H]3CCC2=C1 VIKNJXKGJWUCNN-XGXHKTLJSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3581—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using far infrared light; using Terahertz radiation
- G01N21/3586—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using far infrared light; using Terahertz radiation by Terahertz time domain spectroscopy [THz-TDS]
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0118—Apparatus with remote processing
Abstract
The invention relates to a back laser device for detecting long-distance dangerous articles based on THz waves. Ultrashort pulse laser output by a laser light source is divided into two beams by a beam splitter, a reflected beam is focused by a laser focusing system to be nearby a long-distance article to be detected, a gas medium near the article to be detected is ionized to form drawn wires and generate back laser, and the generated back laser returns and is reflected to enter a back laser detection system through a two-tone light splitter; and the transmitted light through the beam splitter enters a THz wave launching system, THz is projected to the article to be detected through an angle-tunable reflector, THz waves transmitting through or reflected by the article to be detected carry the relevant information of the article to be detected, simultaneously, the THz waves influence the attribute of gas in the ambient environment, and the relevant information of the article to be detected is transmitted back to the laser detection system by the back laser and recognized and monitored to realize detection of the long-distance dangerous articles. The device is simple, easy to operate and wide in applied range.
Description
Technical field
The present invention relates to a kind of detection means, detect danger particularly to a kind of dorsad laser far-distance based on THz wave
The device of dangerous article.
Background technology
THz wave refers to frequency in 0.1-10 THz scope（Wavelength is in 0.03 to 3 mm scopes）Electromagnetic wave（1 THz
=1012Hz）, it is located between microwave and infra-red radiation in electromagnetic spectrum.The special electromagnetic spectrum position of THz wave makes it
There are many uniquenesses, such as photon energy is low-in milli electron-volt magnitude；Will not be harmful to biological tissue's generation
Photoionization；A lot of materials have very strong absorption and dispersion in this wave band, can be used for differentiating different material etc..
Dorsad laser is that femtosecond laser is produced and former light using gas molecule as medium during focusing on formation wire drawing
The contrary laser emission in the line direction of propagation.Using the characteristic of dorsad laser reverse transfer, can make up common laser can only be forward
Transmission, needs the shortcoming that just can be detected in far field, produces dorsad laser by forming wire drawing in far field focus, can far
Treating that measurement information carries and return to allow detection to carry out near field at.
Using THz wave, dangerous goods are detected it is simply that being utilized in dangerous goods Cucumber to terahertz emission
Propagate and there is certain non-cooperating, also referred to as attenuation by absorption.Some predetermined substances in article to be measured, its internal atom
Itself can exist vibration and rotate, these vibration and rotate be located frequency range be exactly terahertz wave band, terahertz emission and this
Resonance is realized in a little vibrations and rotation, thus obtaining many absworption peaks, realizes finding one or many of a certain uncertain material of judgement
Individual index.The THz wave carrying this substance characteristics passes through to affect the gaseous environment around object under test, and impact generates dorsad
Laser, thus the relevant information of object under test is passed back and be identified by dorsad laser.
Currently typically utilize terahertz time-domain spectroscopy detection system, Fu using the method that THz wave carries out sample detection
In leaf infrared spectrometer, backward wave tube etc..Terahertz time-domain spectroscopy detection system needs will detect light and jointly assemble with THz wave
On electro-optic crystal or quasiconductor antenna, then detected by EO, so that the absworption peak of THz wave is shown；Fourier's infrared light
Spectrometer needs to detect under vacuum conditions；The detection system of backward wave tube needs to converge to THz wave to be visited on Gao Laiguan
Survey.These methods or equipment require that article to be measured need to be placed on internal system it is impossible to realize long-range detection.
Content of the invention
The present invention be directed to present THz wave detection means cannot realize the problem detecting to article to be measured at a distance, carry
Go out the device that a kind of dorsad laser far-distance based on THz wave detects dangerous goods, employ terahertz sources system,
Laser focusing and dorsad laser detection system, the humorous reflecting mirror of adjustable angle, by dorsad laser by the thing entrained by THz wave
Product Information Communication is returned, and realizes the detection to dangerous goods at a distance.
The technical scheme is that：A kind of dorsad laser far-distance based on THz wave detects the dress of dangerous goods
Put, including LASER Light Source, beam splitting chip, the first reflecting mirror, delayed time system, the second reflecting mirror, quarter-wave plate, laser focusing system
System, article to be measured, the 3rd reflecting mirror, THz wave emission system, the humorous reflecting mirror of adjustable angle, double-tone spectroscope piece and dorsad swash
Optical detection system；
The ultra-short pulse laser of LASER Light Source output is divided into two bundles via beam splitting chip, and the reflected beams, after the first reflecting mirror, are passed through
Time delay module, then enter laser focusing system, the double-colored light splitting of light transmission of convergence through the second reflecting mirror and quarter-wave plate
After eyeglass, focus at a distance near article to be measured, nearby gas medium forms wire drawing to ionize article to be measured, produces and dorsad swashs
Light, the dorsad laser backtracking of generation, again through double-tone spectroscope piece, is reflected into dorsad laser detection system；
Pass through the 3rd reflecting mirror through the transmitted light of beam splitting chip and enter THz wave emission system, give off the THz wave of collimation
By the humorous reflecting mirror of adjustable angle, Terahertz is projected on article to be measured, the Terahertz being passed through or reflecting by article to be measured
Ripple will carry the relevant information of article to be measured, and THz wave affects the attribute of surrounding environmental gases, the correlation of article to be measured simultaneously
Information passes dorsad laser detection system identified monitoring back by dorsad laser, realizes remote dangerous goods detection.
Described laser focusing system is combined by lens combination or paraboloidal mirror, the ultrafast laser after focusing system
Produce strong-focusing wire drawing in far field ionized gas, produce dorsad laser, its direction of propagation and LASER Light Source raw propagation direction phase
Instead.
The beneficial effects of the present invention is：The dorsad laser far-distance based on THz wave for the present invention detects dangerous goods
Device, can pass the entrained Item Information to be measured of THz wave spectrum back by dorsad laser, thus realizing Terahertz, dorsad swashing
Light detects dangerous goods at a distance, and device is simple, easily operates, applied range.
Brief description
Fig. 1 is the apparatus structure schematic diagram that the dorsad laser far-distance based on THz wave for the present invention detects dangerous goods；
Fig. 2 is THz wave emission system structural representation of the present invention.
Specific embodiment
Dorsad laser far-distance based on THz wave detects the apparatus structure schematic diagram of dangerous goods, bag as shown in Figure 1
Include LASER Light Source 1, beam splitting chip 2, the first reflecting mirror 3, delayed time system 4, the second reflecting mirror 5, quarter-wave plate 6, laser focusing
System 7, article 8 to be measured, the 3rd reflecting mirror 9, THz wave emission system 10, the humorous reflecting mirror of adjustable angle 11, double-tone spectroscope
Piece 12, dorsad laser detection system 13.The ultra-short pulse laser of LASER Light Source 1 output is divided into two bundles, reflected light via beam splitting chip 2
Bundle, after the first reflecting mirror 3, by time delay module 4, then enters laser focusing through the second reflecting mirror 5 and quarter-wave plate 6
System 7, after the light transmission double-tone spectroscope piece 12 of convergence, focuses at a distance near article 8 to be measured, that is, laser focusing system is burnt
Point is near article 8 to be measured.The dorsad laser backtracking that focal point produces, again through double-tone spectroscope piece 12, is reflected into
Dorsad laser detection system 13；The light beam that another part passes through beam splitting chip 2 enters THz wave transmitting system by the 3rd reflecting mirror 9
System 10, the THz wave giving off collimation passes through the humorous reflecting mirror of adjustable angle 11, and Terahertz is projected on article 8 to be measured.Quilt
Article transmission to be measured or the THz wave reflecting will carry the relevant information of article to be measured, and THz wave can affect surrounding
The attribute of environmental gas, thus affect the dorsad laser being generated when laser focuses in gaseous environment.Finally, article to be measured
Relevant information passes dorsad laser detection system 13 identified monitoring back by dorsad laser, thus realizing the back of the body based on THz wave
Detect dangerous goods to laser far-distance.
In following examples of implementation, assembled in air dielectric with the femtosecond laser of centre wavelength 800nm and give off too
Hertz wave, is focused on using circularly polarized light and produces dorsad as a example laser, its all band, other terahertz radiation methods and other
Gas medium is consistent with this implementation.
Laser instrument output center wavelength of light is 800nm, spectral region 780-820nm, and pulse width is 130fs, repeats frequency
Rate 1KHz, implement Terahertz, dorsad laser far-distance detect dangerous goods process as follows：From LASER Light Source 1 output
Ultra-short pulse laser is through beam splitting chip 2（The transmission of beam splitting is 2 with reflection ratio:8）It is divided into two bundles, the reflected beams are through the first reflecting mirror
After 3, by time delay module 4, then enter laser focusing system 7, the light of convergence through the second reflecting mirror 5 and quarter-wave plate 6
Through double-tone spectroscope piece 12（800nm reflection 337nm thoroughly）Afterwards, focus on the vicinity of article 8 to be measured at a distance, ionize determinand
Nearby gas medium forms wire drawing to product, produces dorsad laser（Wavelength 337 is nm）, dorsad laser and primary source direction of propagation phase
Instead, then reflect dorsad laser through double-tone spectroscope piece 12 and enter detection system 13；The light beam that another part passes through beam splitting chip 2 leads to
Cross the 3rd reflecting mirror 9, entering THz wave transmitting is the structural representation of THz wave emission system shown in 10, Fig. 2, passes sequentially through
Internal condenser lenses 10-1 and frequency-doubling crystal 10-2 forms air plasma, and the taper THz wave giving off passes through terahertz
Hereby become the THz wave of collimation after lens 10-3, the THz wave giving off collimation passes through the humorous reflecting mirror of adjustable angle 11, will
THz wave projects on article 8 to be measured, and the Terahertz being passed through or reflected by article to be measured will carry the correlation of article to be measured
Information, and THz wave can affect the attribute of surrounding environmental gases, thus affecting to be given birth to when laser focuses in gaseous environment
The dorsad laser becoming.Finally, the relevant information of article to be measured passes dorsad laser detection system 13 being identified back by dorsad laser
Monitoring, thus the dorsad laser far-distance realized based on THz wave detects dangerous goods.
By the tunable reflecting mirror of rotational angle, THz wave can be projected at the article to be measured of different distance；Institute
State laser focusing system to be combined by lens combination or paraboloidal mirror, the ultrafast laser after focusing system is in far field electricity
Produce strong-focusing wire drawing from gas, produce dorsad laser, its direction of propagation is in opposite direction with LASER Light Source raw propagation；Described too
Hertz wave emission system, its Terahertz can be by quasiconductor antenna, electro-optic crystal, and the mode such as frequency-doubling crystal produces, the cone giving off
Shape THz wave becomes the THz wave of collimation after Terahertz lens or paraboloidal mirror.
Claims (2)
1. a kind of dorsad laser far-distance based on THz wave detects the device of dangerous goods it is characterised in that including laser
Light source, beam splitting chip, the first reflecting mirror, delayed time system, the second reflecting mirror, quarter-wave plate, laser focusing system, determinand
Product, the 3rd reflecting mirror, THz wave emission system, the humorous reflecting mirror of adjustable angle, double-tone spectroscope piece and dorsad laser acquisition system
System；
The ultra-short pulse laser of LASER Light Source output is divided into two bundles via beam splitting chip, and the reflected beams, after the first reflecting mirror, are passed through
Time delay module, then enter laser focusing system, the double-colored light splitting of light transmission of convergence through the second reflecting mirror and quarter-wave plate
After eyeglass, focus at a distance near article to be measured, nearby gas medium forms wire drawing to ionize article to be measured, produces and dorsad swashs
Light, the dorsad laser backtracking of generation, again through double-tone spectroscope piece, is reflected into dorsad laser detection system；
Pass through the 3rd reflecting mirror through the transmitted light of beam splitting chip and enter THz wave emission system, give off the THz wave of collimation
By the humorous reflecting mirror of adjustable angle, Terahertz is projected on article to be measured, the Terahertz being passed through or reflecting by article to be measured
Ripple will carry the relevant information of article to be measured, and THz wave affects the attribute of surrounding environmental gases, the correlation of article to be measured simultaneously
Information passes dorsad laser detection system identified monitoring back by dorsad laser, realizes remote dangerous goods detection.
2. the dorsad laser far-distance based on THz wave detects the device of dangerous goods, its feature according to claim 1
It is, described laser focusing system is combined by lens combination or paraboloidal mirror, the ultrafast laser after focusing system exists
Far field ionized gas produces strong-focusing wire drawing, produces dorsad laser, and its direction of propagation is in opposite direction with LASER Light Source raw propagation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610879457.3A CN106442379B (en) | 2016-10-09 | 2016-10-09 | The device backwards to laser far-distance detection dangerous goods based on THz wave |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610879457.3A CN106442379B (en) | 2016-10-09 | 2016-10-09 | The device backwards to laser far-distance detection dangerous goods based on THz wave |
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| Publication Number | Publication Date |
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| CN106442379A true CN106442379A (en) | 2017-02-22 |
| CN106442379B CN106442379B (en) | 2018-11-13 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108226077A (en) * | 2018-02-08 | 2018-06-29 | 上海理工大学 | Relative spectral changing rule distinguishes the device of detection far field Atmospheric components |
| CN110133855A (en) * | 2019-05-08 | 2019-08-16 | 上海理工大学 | THz wave salt free ligands transmission method is guided based on plasma column array |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN110133855A (en) * | 2019-05-08 | 2019-08-16 | 上海理工大学 | THz wave salt free ligands transmission method is guided based on plasma column array |
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| Publication number | Publication date |
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| CN106442379B (en) | 2018-11-13 |
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