CN107064049A - A kind of Optical devices and discrimination method for being used to differentiate organic components and content - Google Patents
A kind of Optical devices and discrimination method for being used to differentiate organic components and content Download PDFInfo
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- CN107064049A CN107064049A CN201710129710.8A CN201710129710A CN107064049A CN 107064049 A CN107064049 A CN 107064049A CN 201710129710 A CN201710129710 A CN 201710129710A CN 107064049 A CN107064049 A CN 107064049A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 39
- 238000012850 discrimination method Methods 0.000 title abstract description 5
- 239000005416 organic matter Substances 0.000 claims abstract description 17
- 239000013078 crystal Substances 0.000 claims description 40
- 239000000523 sample Substances 0.000 claims description 35
- 230000005284 excitation Effects 0.000 claims description 21
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 238000013519 translation Methods 0.000 claims description 8
- 238000013459 approach Methods 0.000 claims description 3
- 230000005622 photoelectricity Effects 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 238000001228 spectrum Methods 0.000 abstract description 15
- 238000001514 detection method Methods 0.000 abstract description 12
- 238000010521 absorption reaction Methods 0.000 abstract description 9
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 6
- 235000019198 oils Nutrition 0.000 description 6
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 3
- 230000003993 interaction Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000003595 spectral effect Effects 0.000 description 3
- 239000011701 zinc Substances 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 2
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910052594 sapphire Inorganic materials 0.000 description 2
- 239000010980 sapphire Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 244000068988 Glycine max Species 0.000 description 1
- 235000010469 Glycine max Nutrition 0.000 description 1
- 235000019484 Rapeseed oil Nutrition 0.000 description 1
- 235000003434 Sesamum indicum Nutrition 0.000 description 1
- 244000000231 Sesamum indicum Species 0.000 description 1
- 238000000862 absorption spectrum Methods 0.000 description 1
- 210000004556 brain Anatomy 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 235000005687 corn oil Nutrition 0.000 description 1
- 239000002285 corn oil Substances 0.000 description 1
- 239000008157 edible vegetable oil Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 230000007704 transition Effects 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
-
- 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
- G01N21/3577—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing liquids, e.g. polluted water
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Toxicology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
A kind of Optical devices and discrimination method for being used to differentiate organic components and content, belong to detection means technical field.The present invention can effectively collect spectrum using high accuracy, large aperture and the strong parabolic mirror of low frequency signal acquisition capacity；Signal noise is controlled using chopper and phase locking unit, significantly suppresses useless noise, improves detection signal-to-noise ratio, improves detection sensitivity, realize effective detection of weak signal；Selective modulation is carried out to light signal strength using filter, the contrast of signal is improved, realizes effective analysis of signal contrast；It is compared to extract the composition and content of organic matter samples using the absorption information such as peak position and absorption coefficient in the tera-hertz spectra collected and with standard sample.
Description
Technical field
The invention belongs to detection means technical field, a kind of light for being used to differentiate organic components and content is specifically related to
Learn device and discrimination method.
Background technology
Terahertz light be it is a kind of between microwave and it is infrared between radiative frequency span exist in 0.1~10THz, wave-length coverage
3mm~30um electromagnetic wave.In person in electronics, the electromagnetic wave of this wave band is referred to as millimeter and involves submillimeter wave, and
In optical field, it is then referred to as far ir ray.Very abundant physics is included through the tera-hertz spectra that material is sent
And chemical information, study material and have great importance in the spectrum of the wave band for the exploration of the structure of matter.With conventional light source
Compare, thz laser has many unique properties, such as transient state, low energy, broadband property, coherence, and to very
The penetration power of multipolarity material is strong and has strong absorbability etc. to polar molecule, therefore it leads in basic research field, medical science
There is very important application prospect in domain, industrial circle, military field and biological field.Terahertz light spectral technology is a kind of new
Emerging, efficient coherent detection technology, due to many transition of the polarity macromolecular between vibration level and the jump between rotational energy level
Move and be exactly in terahertz light spectral limit, or even being excited between Terahertz frequency range has substantial amounts of DNA molecular main chain is intrinsic common
Shake, therefore the tera-hertz spectra of organic biomolecules can reflect and be caused by intramolecular or intermolecular collective vibration and lattice vibration
Low-frequency vibration mould intrinsic property.In addition, the collective vibration pattern observed in absorption spectrum by whole molecule configuration and
Conformation is determined, reflects the interaction between molecule and environment, therefore tera-hertz spectra can also be the configuration and structure of molecule
As there is provided direct characteristic spectrum.In a word, thz laser has relatively low photon energy, will not be produced when carrying out sample detection
Raw harmful photoionization, is a kind of effective lossless detection method, can be applied to the research of organic biomolecules conformation, base
In terms of differentiating because of Structural Identification and isomr.
The content of the invention
The present invention mainly solve technical problem present in above-mentioned prior art there is provided one kind be used to differentiating organic matter into
Divide the Optical devices and discrimination method with content, terahertz light is in using the vibration of organic molecule, rotation feature frequency
In spectral limit, and resonant reaction can be produced with thz laser interaction, so as to identify organic matter samples rapidly and sensitively
Composition and content.
The above-mentioned technical problem of the present invention is mainly what is be addressed by following technical proposals：One kind is used to differentiate organic
The Optical devices of thing composition and content, including laser, beam splitter, parabolic mirror, Terahertz sensing crystal and phase locking unit, institute
State laser transmitting laser, beam splitter by laser beam splitter into exploring laser light and excitation laser, the exploring laser light and excitation laser
The respective branch road of approach, beam is closed by parabolic mirror convergence, is synchronously converged on Terahertz sensing crystal, the Terahertz sensing
The rear end of crystal is provided with optical splitter, and the phase locking unit is provided with photoelectric probe, visited between phase locking unit and photoelectric probe by photoelectricity
Head data wire connection, the photoelectric probe is arranged on the rear end of optical splitter, and the light letter that optical splitter is transmitted is received for detecting
Number, the exploring laser light branch road include completely reflecting mirror, delayer and focus lamp, the completely reflecting mirror, delayer and focus lamp according to
Secondary to place, the excitation laser branch road includes chopper, filter, focus lamp and Terahertz conversion crystal, the chopper, filter
Light device, focus lamp and Terahertz conversion crystal are sequentially placed, and the chopper is connected by chopper control line with phase locking unit, institute
It is two to state parabolic mirror quantity, and putting for parabolic mirror is in " eight " font, the center of the left side parabolic mirror
Provided with circular aperture, organic matter samples to be measured are provided between the parabolic mirror.
Preferably, being provided with quarter wave plate 14 and focus lamp between the Terahertz sensing crystal and optical splitter, quarter wave plate 14 is located at
The Terahertz senses the rear end of crystal, and focus lamp is located at the rear end of quarter wave plate 14.
Preferably, being provided with filter between the optical splitter and photoelectric probe.
Preferably, the delayer is made up of completely reflecting mirror and rectilinear translation platform, the quantity of the completely reflecting mirror is two
It is individual, it is both secured on rectilinear translation platform, the angles of described two completely reflecting mirrors right angle each other.
The method for differentiating organic components and content using above-mentioned Optical devices is：
Step (1), laser transmitting laser, beam splitter is by laser beam splitter into exploring laser light and excitation laser；
Step (2), excitation laser is each passed through chopper and wave filter, and Terahertz conversion crystal is converged to by focus lamp
On, thz laser is produced with the effect of Terahertz conversion crystal, thz laser is collected through parabolic mirror, then had with to be measured
Machine thing sample interacts and transmitted, then is converged to through parabolic mirror on Terahertz sensing crystal, wherein, chopper and lock phase
Device cooperates, for suppressing the strong signal of fundamental frequency while pinning high frequency weak signal, so as to effectively extract the height for being loaded with sample message
Frequency weak signal, improves signal to noise ratio, and filter can adjust excitation laser light intensity magnitude；
Step (3), exploring laser light is after completely reflecting mirror, delayer and focus lamp, through small on the parabolic mirror of left side
Hole, then converged to through parabolic mirror on Terahertz sensing crystal, wherein, delayer along exploring laser light transmission direction by translating
It is totally reflected microscope group to realize that the delay between exploring laser light and excitation laser regulates and controls, realizes that exploring laser light is synchronous with thz laser
And converge to jointly on Terahertz sensing crystal；
Step (4), is loaded with the optical signal of organic matter samples information to be measured after Terahertz senses crystal and quarter wave plate 14 is modulated,
The device that is split is divided into two-way contrast light beam, and two-way contrast light beam distinguishes filtered device, detected and receive by photoelectric probe, pass through photoelectricity
Probe data line is sent to phase locking unit, and phase locking unit carries out analysis contrast to the carrier signal for being loaded with organic matter samples information to be measured,
So as to parse the sample message of its carrying.
The principle for differentiating organic components and content using above-mentioned Optical devices is：Spectrum is extracted by above-mentioned Optical devices
The information such as absorption peak position and absorption coefficient in information, the organic matter samples are appraised and decided out by the contrast with standard information storehouse
Composition and content, i.e., different absorption peak positions (i.e. characteristic peak) correspond to different organic components, so as to identify
Organic components, the absorption coefficient of absworption peak correspondence position correspond to different content of organics, so as to identify organic matter
Content, its essence is that the vibration frequency and rotational frequency that make use of organic matter are in the range of tera-hertz spectra, and and terahertz
Hereby laser interaction can produce resonant reaction, so as to identify the composition and content of organic matter samples rapidly and sensitively.
The device have the advantages that：The similar Gaussian beam of tera-hertz spectra, is a kind of wave spectrum of diverging, using high-precision
Degree, large aperture and the strong parabolic mirror of low frequency signal acquisition capacity can effectively collect spectrum；Utilize chopper and phase locking unit pair
Signal noise is controlled, and significantly suppresses useless noise, is improved detection signal-to-noise ratio, is improved detection sensitivity, realize weak
Effective detection of signal；Selective modulation is carried out to light signal strength using filter, the contrast of signal is improved, realizes
Effective analysis of signal contrast；Using information such as the absorption peak position in the tera-hertz spectra collected and absorption coefficients and with
Standard sample is compared to extract the composition and content of organic matter samples.
Brief description of the drawings
Fig. 1 is a kind of structural representation of the present invention；
Fig. 2 is the Terahertz characteristic light spectrogram that present invention specific implementation episode analysis is obtained.
In figure：1st, laser；2nd, beam splitter；3rd, parabolic mirror；4th, Terahertz sensing crystal；5th, phase locking unit；6th, laser；
7th, exploring laser light；8th, excitation laser；9th, optical splitter；10th, photoelectric probe；11st, photoelectric probe data wire；12nd, completely reflecting mirror；13、
Delayer；14th, focus lamp；15th, chopper；16th, filter；17th, Terahertz conversion crystal；18th, organic matter samples to be measured；19、
Quarter wave plate 14；20th, rectilinear translation platform；21st, chopper control line；22nd, computer；23rd, delayer control line；24th, phase locking unit control line；
25th, thz laser.
Embodiment
Below by embodiment, and with reference to accompanying drawing, technical scheme is described in further detail.
Embodiment：A kind of Optical devices for being used to differentiate organic components and content, as shown in figure 1, including laser, dividing
Beam device, parabolic mirror, Terahertz sensing crystal, phase locking unit and computer, the laser launch laser, and beam splitter divides laser
Beam is into exploring laser light and excitation laser, and the respective branch road of exploring laser light and the excitation laser approach is converged by parabolic mirror
Beam is closed, Terahertz sensing crystal is synchronously converged at, the rear end of the Terahertz sensing crystal is provided with optical splitter, the phase locking unit
Provided with photoelectric probe, connected between phase locking unit and photoelectric probe by photoelectric probe data wire, the photoelectric probe is arranged on point
The rear end of light device, the optical signal that optical splitter is transmitted is received for detecting, and the phase locking unit passes through phase locking unit control line and electricity
Brain is connected, and the exploring laser light branch road includes completely reflecting mirror, delayer and focus lamp, the completely reflecting mirror, delayer and focusing
Mirror is sequentially placed, and the delayer is connected by delayer control line with computer, and the excitation laser branch road includes chopper, filter
Light device, focus lamp and Terahertz conversion crystal, the chopper, filter, focus lamp and Terahertz conversion crystal are sequentially placed,
The chopper is connected by chopper control line with phase locking unit, and the parabolic mirror quantity is two, parabolic mirror
Put in " eight " font, the center of the left side parabolic mirror, which is provided between circular aperture, the parabolic mirror, to be provided with
Organic matter samples to be measured.
Quarter wave plate 14 and focus lamp are provided between the Terahertz sensing crystal and optical splitter, quarter wave plate 14 is located at the Terahertz
Sense the rear end of crystal, focus lamp is located at the rear end of quarter wave plate 14.
Filter is provided between the optical splitter and photoelectric probe.
The delayer is made up of completely reflecting mirror and rectilinear translation platform, and the quantity of the completely reflecting mirror is two, is fixed
In on rectilinear translation platform, the angles of described two completely reflecting mirrors right angle each other.
Wherein, laser uses sapphire femto-second laser, and the wavelength of output laser is that 800nm, output frequency are
50MHz, output pulse width are that 100fs, power output are 500mW；The energy splitting ratio of beam splitter is 2:1；The copped wave frequency of chopper
Rate is 3KHz；Filter uses disc rotary type filter, can adjust laser energy；It is arranged on the focusing on excitation laser branch road
Mirror uses 500nm focal lengths, and the focus lamp being arranged on exploring laser light branch road uses 800nm focal lengths, is arranged on quarter wave plate 14 rear end
Focus lamp uses 300nm focal lengths；Completely reflecting mirror uses 800nm deielectric-coating completely reflecting mirrors；The focal length of parabolic mirror is 200nm,
The aperture for having a diameter of 2mm is dug in the middle of one of parabolic mirror；Terahertz conversion crystal is gallium arsenide, two ends
Making alive is needed, to improve Terahertz transformation efficiency；Terahertz sensing crystal is zinc telluridse crystal；Quarter wave plate 14 uses 800nm 1/4
Wave plate；Optical splitter uses Butterworth prism；Photoelectric probe is popped one's head in using high speed optoelectronic, can convert optical signals to electric signal；It is to be measured
Multiple eating oil and the gutter oil of outdoor collection that organic matter samples are purchased using supermarket；Computer is used for the scanning for controlling delayer
Speed, and receive the gathered data from phase locking unit.
Experimentation is as follows：Sapphire femto-second laser export 800nm femtosecond laser, be beamed into through beam splitter excite it is sharp
Light and exploring laser light, excitation laser line focus mirror converge at gallium arsenide and produce thz laser；Thz laser is through throwing
Thing speculum is collected and radiated in the tera-hertz spectra and exploring laser light copolymerization on sample, being then loaded with sample message in zinc telluridse
On crystal, interacting and being detected by photoelectric probe with zinc telluridse crystal perceives；Computer control delayer regulation excitation laser with
Time delay between exploring laser light, can scan the time domain waveform of terahertz pulse, the signal that photoelectric probe detection is perceived
Extracted through phase locking unit and send computer to, time-domain signal is passed through Fourier transformation by computer, you can obtain Terahertz frequency domain spectra
Figure.
Fig. 2 is to use above-mentioned Optical devices, and scanning obtains sky sample cell, soya-bean oil, rapeseed oil, corn oil, ready-mixed oil, sesame
The Terahertz characteristic light spectrogram of oil and gutter oil.It is seen that the absorption peak position of Various Edible sample and amplitude are strong
Degree etc. has differences, and difference absorbs peak position and represents different organic components, and different oscillator intensities represents different contain
Amount, the information such as the composition and content of edible oil can be effectively identified using above-mentioned Optical devices.
Finally it is pointed out that above example is only the more representational example of the present invention.It is clear that the invention is not restricted to
Above-described embodiment, can also there is many deformations.Any letter that every technical spirit according to the present invention is made to above example
Single modification, equivalent variations and modification, are considered as belonging to protection scope of the present invention.
Claims (5)
- It is used to differentiating the Optical devices of organic components and content 1. a kind of, including laser, beam splitter, parabolic mirror, too Hertz sensing crystal and phase locking unit, it is characterised in that the laser launches laser, beam splitter is by laser beam splitter into exploring laser light And excitation laser, the respective branch road of exploring laser light and the excitation laser approach, pass through parabolic mirror convergence and close beam, synchronous convergence In on Terahertz sensing crystal, the rear end of the Terahertz sensing crystal is provided with optical splitter, and the phase locking unit is visited provided with photoelectricity Head, is connected between phase locking unit and photoelectric probe by photoelectric probe data wire, and the photoelectric probe is arranged on the rear end of optical splitter, Receive the optical signal that optical splitter is transmitted for detecting, the exploring laser light branch road includes completely reflecting mirror, delayer and focusing Mirror, the completely reflecting mirror, delayer and focus lamp are sequentially placed, and the excitation laser branch road includes chopper, filter, focusing Mirror and Terahertz conversion crystal, the chopper, filter, focus lamp and Terahertz conversion crystal are sequentially placed, the copped wave Device is connected by chopper control line with phase locking unit, and the parabolic mirror quantity is two, and putting for parabolic mirror is in " eight " font, the center of the left side parabolic mirror is provided between circular aperture, the parabolic mirror to be had provided with to be measured Machine thing sample.
- 2. a kind of according to claim 1 be used to differentiate the Optical devices of organic components and content, it is characterised in that described Terahertz, which senses, is provided with quarter wave plate 14 and focus lamp between crystal and optical splitter, quarter wave plate 14 is located at after Terahertz sensing crystal End, focus lamp is located at the rear end of quarter wave plate 14.
- 3. a kind of according to claim 1 be used to differentiate the Optical devices of organic components and content, it is characterised in that described Filter is provided between optical splitter and photoelectric probe.
- 4. a kind of according to claim 1 be used to differentiate the Optical devices of organic components and content, it is characterised in that described Delayer is made up of completely reflecting mirror and rectilinear translation platform, and the quantity of the completely reflecting mirror is two, is both secured to rectilinear translation platform On, the angles of described two completely reflecting mirrors right angle each other.
- 5. a kind of Optical devices for being used to differentiate organic components and content according to claim 1-4, it is characterised in that make The method for differentiating organic components and content with the Optical devices is：Step (1), laser transmitting laser, beam splitter is by laser beam splitter into exploring laser light and excitation laser；Step (2), excitation laser is each passed through chopper and wave filter, is converged to by focus lamp on Terahertz conversion crystal, with The effect of Terahertz conversion crystal produces thz laser, and thz laser is collected through parabolic mirror, then with organic matter to be measured Sample interacts and transmitted, then is converged to through parabolic mirror on Terahertz sensing crystal, wherein, chopper and phase locking unit phase Mutually coordinate, for suppress the strong signal of fundamental frequency and meanwhile pin high frequency weak signal so that effectively extract be loaded with sample message high frequency it is weak Signal, improves signal to noise ratio, and filter can adjust excitation laser light intensity magnitude；Step (3), exploring laser light is after completely reflecting mirror, delayer and focus lamp, the aperture through on the parabolic mirror of left side, then Converged to through parabolic mirror on Terahertz sensing crystal, wherein, delayer along the translation of exploring laser light transmission direction by being all-trans Penetrate microscope group to realize that the delay between exploring laser light and excitation laser regulates and controls, realize that exploring laser light is synchronous with thz laser and common Sense with Terahertz is converged on crystal；Step (4), is loaded with the optical signal of organic matter samples information to be measured after Terahertz senses crystal and quarter wave plate 14 is modulated, is divided Light device is divided into two-way contrast light beam, and two-way contrast light beam distinguishes filtered device, detected and receive by photoelectric probe, pass through photoelectric probe Data wire is sent to phase locking unit, and phase locking unit carries out analysis contrast to the carrier signal for being loaded with organic matter samples information to be measured, so that Parse the sample message of its carrying.
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| CN108760673A (en) * | 2018-04-13 | 2018-11-06 | 清华大学 | The device and method of high-risk chemical detection based on Terahertz |
| WO2019127953A1 (en) * | 2017-12-30 | 2019-07-04 | 深圳市太赫兹科技创新研究院 | Method and apparatus for detecting quality of drug based on electromagnetic waves |
| WO2019153460A1 (en) * | 2018-02-06 | 2019-08-15 | 深圳市无牙太赫兹科技有限公司 | Atr mode-based material composition identification method, device, and computer apparatus |
| US10571393B2 (en) | 2018-04-13 | 2020-02-25 | Tsinghua University | Terahertz gas detection method and device based on Gregory double reflection antenna |
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