CN106442379B - The device backwards to laser far-distance detection dangerous goods based on THz wave - Google Patents
The device backwards to laser far-distance detection dangerous goods based on THz wave Download PDFInfo
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- CN106442379B CN106442379B CN201610879457.3A CN201610879457A CN106442379B CN 106442379 B CN106442379 B CN 106442379B CN 201610879457 A CN201610879457 A CN 201610879457A CN 106442379 B CN106442379 B CN 106442379B
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- 238000001514 detection method Methods 0.000 title claims abstract description 36
- 239000007789 gas Substances 0.000 claims abstract description 14
- 238000005491 wire drawing Methods 0.000 claims abstract description 9
- 230000007613 environmental effect Effects 0.000 claims abstract description 5
- 238000012544 monitoring process Methods 0.000 claims abstract description 5
- 230000003111 delayed effect Effects 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000004065 semiconductor 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
- 239000006185 dispersion Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000000463 material Substances 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
- 230000000644 propagated effect Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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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]
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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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0118—Apparatus with remote processing
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Abstract
The device for the detection dangerous goods of laser far-distance backwards based on THz wave that the present invention relates to a kind of, the ultra-short pulse laser of laser light source output is divided into two bundles via beam splitting chip, the reflected beams are through laser focusing system, it focuses near remote article to be measured, ionizing article to be measured, nearby gas medium forms wire drawing, it generates backwards to laser, the laser backtracking backwards of generation is reflected into using double-tone spectroscope piece backwards to laser detection system；Enter THz wave emission system by the transmitted light of beam splitting chip, pass through the humorous speculum of adjustable angle, Terahertz is projected on article to be measured, the relevant information of article to be measured will be carried by the THz wave that article to be measured is penetrated or reflected, THz wave influences the attribute of surrounding environmental gases simultaneously, the relevant information of article to be measured realizes remote dangerous goods detection by being passed back backwards to laser detection system and identified monitoring backwards to laser.Device is simple, easy to operate, has a wide range of application.
Description
Technical field
The present invention relates to a kind of detection device, more particularly to a kind of endangering backwards to laser far-distance detection based on THz wave
The device of dangerous article.
Background technology
THz wave refers to frequency in 0.1-10 THz ranges（Wavelength is in 0.03 to 3 mm ranges）Electromagnetic wave（1 THz
=1012Hz）, in electromagnetic spectrum between microwave and infra-red radiation.The special electromagnetic spectrum position of THz wave makes it
Have the advantages that it is many uniqueness, such as photon energy it is low-in milli electron-volt magnitude；Biological tissue will not be generated harmful
Photoionization；Many substances have very strong absorption and dispersion in the wave band, can be used for differentiating different material etc..
It is that femtosecond laser is generated during focusing forms wire drawing and former light using gas molecule as medium backwards to laser
The opposite laser emission in the line direction of propagation.Using the characteristic backwards to laser reverse transfer, can make up common laser can only be forward
Transmission, needs the shortcomings that far field can be just detected, and is generated backwards to laser by forming wire drawing in far field focus, can will be remote
Wait for that measurement information carries back so that detection can carry out near field at.
Dangerous goods are detected using THz wave, are exactly using Cucumber in dangerous goods to terahertz emission
There are certain non-cooperating, also referred to as attenuation by absorption for propagation.Certain predetermined substances in article to be measured, internal atom
Itself can have vibration and rotation, and frequency ranges where these vibrations and rotation are exactly terahertz wave band, terahertz emission and this
Resonance is realized in a little vibrations and rotation, to obtain many absorption peaks, realizes find a certain uncertain substance of judgement one or more
A index.The THz wave of the substance characteristics is carried by influencing the gaseous environment around object under test, influences to generate backwards
Laser, so that the relevant information of object under test backwards to laser by passing back and being identified.
The current method for carrying out sample detection using THz wave is typically to utilize terahertz time-domain spectroscopy detection system, Fu
In leaf infrared spectrometer, backward wave tube etc..Terahertz time-domain spectroscopy detection system needs with THz wave to assemble detection light jointly
It is detected on electro-optic crystal or semiconductor antenna, then by EO, the absorption peak of THz wave is made to be shown；Fourier's infrared light
Spectrometer needs to detect under vacuum conditions；The detection system of backward wave tube, which needs to converge to THz wave on Gao Laiguan, to be visited
It surveys.These methods or equipment require that article to be measured needs to be placed on internal system, cannot achieve long-range detection.
Invention content
The problem of cannot achieve detection to remote article to be measured the present invention be directed to present THz wave detection device, carries
Go out a kind of device backwards to laser far-distance detection dangerous goods based on THz wave, use terahertz sources system,
Laser focuses and backwards to laser detection system, the humorous speculum of adjustable angle, by backwards to laser by the object entrained by THz wave
Product information, which is propagated back to, to be come, and is realized at a distance to the detection of dangerous goods.
The technical scheme is that：A kind of dress backwards to laser far-distance detection dangerous goods based on THz wave
It sets, including femtosecond laser light source, beam splitting chip, the first speculum, delayed time system, the second speculum, quarter-wave plate, laser are poly-
Burnt system, article to be measured, third speculum, THz wave emission system, the humorous speculum of adjustable angle, double-tone spectroscope piece and the back of the body
To laser detection system；
The ultra-short pulse laser of femtosecond laser light source output is divided into two bundles via beam splitting chip, and the reflected beams are through the first speculum
Afterwards, by time delay module, enter laser focusing system using the second speculum and quarter-wave plate, the light of convergence is through double
It after color is divided eyeglass, focuses near remote article to be measured, ionizing article to be measured, nearby gas medium forms wire drawing, generates the back of the body
To laser, the laser backtracking backwards of generation is reflected into using double-tone spectroscope piece backwards to laser detection system；
THz wave emission system is entered by third speculum by the transmitted light of beam splitting chip, gives off the terahertz of collimation
Hereby wave is projected THz wave on article to be measured by the humorous speculum of adjustable angle, is penetrated or is reflected by article to be measured
THz wave will carry the relevant information of article to be measured, while THz wave influences the attribute of surrounding environmental gases, article to be measured
Relevant information by being passed back backwards to laser detection system and identified monitoring backwards to laser, realize remote dangerous goods detection.
The laser focusing system is composed of lens combination or paraboloidal mirror, the ultrafast laser after focusing system
In far field, ionized gas generates strong-focusing wire drawing, generates backwards to laser, the direction of propagation and femtosecond laser light source raw propagation side
To opposite.
The beneficial effects of the present invention are：The present invention is based on THz wave dangerous goods are detected backwards to laser far-distance
Device, can be by passing the entrained Item Information to be measured of THz wave spectrum back, to realize Terahertz, backwards to sharp backwards to laser
Light detects dangerous goods at a distance, and device is simple, easy to operate, has a wide range of application.
Description of the drawings
Fig. 1 is the apparatus structure schematic diagram that dangerous goods are detected backwards to laser far-distance the present invention is based on THz wave；
Fig. 2 is THz wave emission system structural schematic diagram of the present invention.
Specific implementation mode
The apparatus structure schematic diagram backwards to laser far-distance detection dangerous goods based on THz wave as shown in Figure 1, packet
Include laser light source 1, beam splitting chip 2, the first speculum 3, delayed time system 4, the second speculum 5, quarter-wave plate 6, laser focusing
System 7, article 8 to be measured, third speculum 9, THz wave emission system 10, the humorous speculum 11 of adjustable angle, double-tone spectroscope
Piece 12, backwards to laser detection system 13.The ultra-short pulse laser that laser light source 1 exports is divided into two bundles via beam splitting chip 2, reflected light
Beam is after the first speculum 3, by time delay module 4, enters laser using the second speculum 5 and quarter-wave plate 6 and focuses
System 7, the light of convergence is through after double-tone spectroscope piece 12, focusing near remote article 8 to be measured, i.e., laser focusing system is burnt
Point is near article 8 to be measured.The laser backtracking backwards that focal point generates is reflected into using double-tone spectroscope piece 12
Backwards to laser detection system 13；Another part enters THz wave transmitting system through the light beam of beam splitting chip 2 by third speculum 9
System 10, gives off the THz wave of collimation by the humorous speculum 11 of adjustable angle, Terahertz is projected on article 8 to be measured.Quilt
The THz wave that article to be measured is penetrated or reflected will carry the relevant information of article to be measured, and THz wave can influence surrounding
The attribute of environmental gas, to influence the laser backwards generated when laser focuses in gaseous environment.Finally, article to be measured
Relevant information backwards to laser by passing back backwards to laser detection system 13 and identified monitoring, to realize the back of the body based on THz wave
Dangerous goods are detected to laser far-distance.
In following examples of implementation, is assembled and given off too in air medium with the femtosecond laser of centre wavelength 800nm
Hertz wave is focused using circularly polarized light and is generated for the laser, all band, other terahertz radiation methods and other
Gas medium is consistent with the implementation.
It is 800nm, spectral region 780-820nm, pulse width 130fs that laser, which exports center wavelength of light, repeats frequency
Rate 1KHz, specific implementation Terahertz, the process that dangerous goods are detected backwards to laser far-distance are as follows：It is exported from laser light source 1
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 speculum
After 3, by time delay module 4, enter laser focusing system 7, the light of convergence using the second speculum 5 and quarter-wave plate 6
Through double-tone spectroscope piece 12（It transmits 800nm and reflects 337nm）Afterwards, it focuses near remote article 8 to be measured, ionization is to be measured
Nearby gas medium forms wire drawing to article, generates backwards to laser（Wavelength 337 is nm）, backwards to laser and primary source direction of propagation phase
Instead, enter backwards to laser detection system 13 backwards to laser using the reflection of double-tone spectroscope piece 12；Another part penetrates beam splitting chip 2
Light beam by third speculum 9, be the structural schematic diagram of THz wave emission system shown in 10, Fig. 2 into THz wave transmitting,
It passes sequentially through internal condenser lens 10-1 and frequency-doubling crystal 10-2 forms air plasma, the taper THz wave given off
By becoming the THz wave of collimation after Terahertz lens 10-3, the THz wave for giving off collimation passes through the humorous reflection of adjustable angle
Mirror 11 projects THz wave on article 8 to be measured, and article to be measured will be carried by the Terahertz that article to be measured is penetrated or reflected
Relevant information, and THz wave can influence the attribute of surrounding environmental gases, be focused in gaseous environment to influence laser
When generated backwards to laser.Finally, the relevant information of article to be measured backwards to laser by passing back backwards to laser detection system 13 simultaneously
Identified monitoring detects dangerous goods based on THz wave to realize backwards to laser far-distance.
By the tunable speculum of rotational angle, THz wave can be projected at the article to be measured of different distance；Institute
Stating laser focusing system can be composed of lens combination or paraboloidal mirror, and the ultrafast laser after focusing system is in far field electricity
Strong-focusing wire drawing is generated from gas, is generated backwards to laser, the direction of propagation is opposite with laser light source raw propagation direction；It is described too
Hertz wave emission system, Terahertz can be by semiconductor antennas, and electro-optic crystal, the modes such as frequency-doubling crystal generate, the cone given off
Shape THz wave by become after Terahertz lens or paraboloidal mirror collimation THz wave.
Claims (2)
1. a kind of device backwards to laser far-distance detection dangerous goods based on THz wave, which is characterized in that including femtosecond
It is laser light source, beam splitting chip, the first speculum, delayed time system, the second speculum, quarter-wave plate, laser focusing system, to be measured
Article, third speculum, THz wave emission system, the humorous speculum of adjustable angle, double-tone spectroscope piece and laser acquisition backwards
System；
Femtosecond laser light source output ultra-short pulse laser be divided into two bundles via beam splitting chip, the reflected beams after the first speculum,
By time delay module, enter laser focusing system using the second speculum and quarter-wave plate, the light of convergence is through double-colored
It after being divided eyeglass, focuses near remote article to be measured, ionizing article to be measured, nearby gas medium forms wire drawing, generates backwards
The laser backtracking backwards of laser, generation is reflected into using double-tone spectroscope piece backwards to laser detection system；
THz wave emission system is entered by third speculum by the transmitted light of beam splitting chip, gives off the THz wave of collimation
By the humorous speculum of adjustable angle, THz wave is projected on article to be measured, the terahertz for being penetrated or being reflected by article to be measured
Hereby wave will carry the relevant information of article to be measured, while THz wave influences the attribute of surrounding environmental gases, the phase of article to be measured
Information is closed by being passed back backwards to laser detection system and identified monitoring backwards to laser, realizes remote dangerous goods detection.
2. the device backwards to laser far-distance detection dangerous goods based on THz wave according to claim 1, feature
It is, the laser focusing system is composed of lens combination or paraboloidal mirror, and the ultrafast laser after focusing system exists
Far field ionized gas generates strong-focusing wire drawing, generates backwards to laser, the direction of propagation and femtosecond laser light source raw propagation direction
On the contrary.
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| 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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