CN109459406A - A kind of terahertz time-domain spectroscopy detection system and method based on dual-beam - Google Patents
A kind of terahertz time-domain spectroscopy detection system and method based on dual-beam Download PDFInfo
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- CN109459406A CN109459406A CN201811523964.9A CN201811523964A CN109459406A CN 109459406 A CN109459406 A CN 109459406A CN 201811523964 A CN201811523964 A CN 201811523964A CN 109459406 A CN109459406 A CN 109459406A
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- 238000001514 detection method Methods 0.000 title claims abstract description 79
- 238000001328 terahertz time-domain spectroscopy Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title abstract description 8
- 230000003287 optical effect Effects 0.000 claims abstract description 20
- 230000007246 mechanism Effects 0.000 claims description 12
- 238000005070 sampling Methods 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims 2
- 230000003111 delayed effect Effects 0.000 claims 1
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- 239000000523 sample Substances 0.000 description 86
- 239000000843 powder Substances 0.000 description 5
- 230000003595 spectral effect Effects 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 3
- 238000000407 epitaxy Methods 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 238000002310 reflectometry Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 2
- NWBJYWHLCVSVIJ-UHFFFAOYSA-N N-benzyladenine Chemical compound N=1C=NC=2NC=NC=2C=1NCC1=CC=CC=C1 NWBJYWHLCVSVIJ-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- HFCYZXMHUIHAQI-UHFFFAOYSA-N Thidiazuron Chemical compound C=1C=CC=CC=1NC(=O)NC1=CN=NS1 HFCYZXMHUIHAQI-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
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- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
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- 229910052710 silicon Inorganic materials 0.000 description 2
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- 238000012360 testing method Methods 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
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- 239000006101 laboratory sample Substances 0.000 description 1
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- 239000004570 mortar (masonry) Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 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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Abstract
The present invention discloses a kind of terahertz time-domain spectroscopy detection system and method based on dual-beam, wherein system includes the laser for generating femtosecond pulse, and the first beam splitter is provided in optical path, femtosecond pulse is divided into two beams, a branch of is pump light, and another beam is detection light；Pump light is divided into the two beam pump lights with identical energy in the optical path of pump light by the second beam splitter；Two groups of Terahertz generator modules are separately positioned in the optical path of two beam pump lights, for generating two beam terahertz signals, are respectively used to detection reference and sample；Two groups of terahertz detectors are respectively used to receive the terahertz signal and output with reference to issuing with sample；Detection light is divided into the two beam pump lights with identical energy, respectively enterd in two groups of terahertz detectors by third beam splitter in the optical path of the detection light.The present invention detects while realization to reference signal and sample signal in sample detection, effectively increases the detection efficiency of terahertz time-domain spectroscopy.
Description
Technical field
The present invention relates to Terahertz detection fields, and in particular to a kind of terahertz time-domain spectroscopy detection system based on dual-beam
System and method.
Background technique
Terahertz time-domain spectroscopic technology, i.e., by terahertz time-domain spectroscopy system obtain substance terahertz wave band transmission or
Spectrum information is reflected, and analysis comparison further is carried out to spectrum, has been widely used in medical treatment and biological research fields.Especially
In view of Terahertz fingerprint spectral property, terahertz light spectral technology has become the following substance and identifies, is classified and detects most potential skill
One of art.
Currently, terahertz time-domain spectroscopy system is detected using single beam.When school zero and measurement, need in two times by blank and
Sample is put into sample cell shelf and measures, and operates relatively complicated.Since moisture is affected for testing result, every time
It is needed before detection toward sample bin inflated with nitrogen with moisture removal, this operation is more time-consuming.In order to improve detection efficiency, terahertz time-domain
The detection method of spectrum needs to improve.
Summary of the invention
Based on this, the present invention provides a kind of terahertz time-domain spectroscopy detection system and method based on dual-beam, can be in sample
It during product examine is surveyed, is detected while realization to reference signal and sample signal, effectively increases the detection effect of terahertz time-domain spectroscopy
Rate.
A kind of terahertz time-domain spectroscopy detection system based on dual-beam, the laser including generating femtosecond pulse, in institute
It states and is provided in the optical path of laser
Femtosecond pulse is divided into two beams by the first beam splitter, and a branch of is pump light, and another beam is detection light；
The pump light is divided into two beams with identical energy in the optical path of the pump light by the second beam splitter
Pump light；
Two groups of Terahertz generator modules are separately positioned in the optical path of two beam pump lights, for generating two beam Terahertzs
Signal is respectively used to detection reference and sample；
Two groups of terahertz detectors are respectively used to receive described with reference to the terahertz signal issued with sample and output；
The detection light is divided into two beams with identical energy in the optical path of the detection light by third beam splitter
Pump light respectively enters in two groups of terahertz detectors.
In the optical path of the pump light, the first backward prism mirror driven by voice coil motor is set.In the spy
It surveys in the optical path of light, the first backward prism mirror driven by stepper motors is set.
It further include conveying the automatic sampling of the sample and varying device in the technical program, comprising:
Workbench, it is interior to be equipped with check bit；
The sample presentation wheel disc being rotatably installed in the workbench, edge setting at least sample groove, sample presentation wheel disc rotate band
Sample to be tested in dynamic sample cell enters the check bit；
To the sample slot of sample cell conveying sample to be tested；
Sample-collecting box positioned at the workbench side collects the detection sample exported in the workbench；
And drive the driving mechanism of the sample presentation wheel disc rotation.
It the automatic sampling and varies device and is mounted in the sample bin of terahertz light spectrometer, terahertz time-domain can be improved
Spectrum reduces cumbersome sampling process to the detection efficiency of sample.Using above-mentioned automatic sampling and device is varied, Ke Yishi
Sample to be tested is now put into designated position and automatic order replacement detection sample automatically, solves the efficiency of replacement sample manually
Low problem.
Chamber is equipped in the workbench, sample presentation wheel disc is located in the chamber, chamber corresponding with the check bit
Room bottom is equipped with detection hole；The side of the chamber is equipped with the output channel connecting with the sample-collecting box, the output channel
Bottom is equipped with and extends to the indoor output inclined-plane of chamber.
Station there are three setting in the workbench, is respectively as follows: sample introduction position, corresponding with the position of sample slot, for receiving
The sample to be tested of sample slot output；Check bit, bottom are equipped with the detection hole；Sample position out connects the output channel,
Detection sample enters in sample-collecting box in sample position out through exporting inclined-plane；
The sample cell of the sample presentation wheel plate edge of rotation passes sequentially through the sample introduction position, check bit and sample position out.
The driving mechanism includes the first rotating shaft for being protruded by workbench bottom and being linked with the sample presentation wheel disc, with institute
State the second parallel shaft of first rotating shaft, and the driving assembly of driving the second shaft rotation；In the first rotating shaft
Portion is equipped with sheave, and the second shaft is equipped with the cutaway disk engaged with the sheave.
The edge of the sheave is equipped with several cambered surfaces being bonded with the cutaway disk, and an engagement is equipped between adjacent two cambered surface
Slot；There is the pin that the sheave rotation is driven with engaging groove cooperation on the cutaway disk, the cutaway disk
Edge is equipped with a notch, and being extended by the notch has pivoted arm, and pin is located at the end of the pivoted arm.
Preferably, the driving assembly is the stepper motor connecting with second shaft.
The terahertz time-domain spectroscopy detection method based on dual-beam that the present invention also provides a kind of, when using above-mentioned Terahertz
Domain spectral detection system is realized, comprising the following steps:
(1) laser generates femtosecond pulse, is divided into two beams through the first beam splitter, a branch of is pump light, and another beam is detection
Light；
(2) light beam is squeezed into retroreflector by reflecting mirror by pump light, and it is enterprising that retroreflector is assemblied in voice coil motor
The scanning of row quick retard；
(3) pump light is divided into the two beam pump lights with identical energy by the second beam splitter, and two beam pump lights pass through phase
Same light path, which is beaten respectively on two Terahertz generator modules, generates two beam terahertz signals, and two beam thz beams are used respectively
In detection reference and sample, thz beam focuses on measured object by parabolic lens, using parabolic lens be incident to it is corresponding too
It is received on hertz detector；
(4) light is squeezed into retroreflector by multiple reflecting mirrors by detection light, and it is sliding that retroreflector is assemblied in stepper motor
On rail, the light path adjustment of long range is carried out；
(5) detection light is divided into the detection light of two beams with identical energy by third beam splitter, and two beams detect light and pass through phase
Same light path is beaten on terahertz detector for detecting two beam terahertz signals；
(6) two terahertz detector modules export electric signal and are handled simultaneously.
The present invention detects while realization to reference signal and sample signal in sample detection, effectively increases terahertz
The hereby detection efficiency of time-domain spectroscopy.
Detailed description of the invention
Fig. 1 is the index path of the terahertz time-domain spectroscopy system based on dual-beam of this invention；
Fig. 2 is automatic sampling and to vary the structure chart of device in the present invention；
Fig. 3 is the relative position relation figure of working end and Geneva mechanism, and wherein a is top view, and b is bottom view；
Fig. 4 is the assembling figure of workbench and sample presentation wheel disc and sample-collecting box；
Fig. 5 is the top view of Geneva mechanism；
Fig. 6 is the structure chart of workbench.
Specific embodiment
Below with reference to embodiment and attached drawing, the present invention will be described in detail, but the present invention is not limited to this.
Terahertz time-domain spectroscopy detection system index path such as Fig. 1 in the present embodiment based on dual-beam, including femtosecond laser
Device 1-1, reflecting mirror 1-2, the first beam splitter 1-3, reflecting mirror 1-4, the first backward prism mirror 1-5, voice coil motor 1-6, instead
Penetrate mirror 1-7, the second beam splitter 1-8, Terahertz generator module 1-9, terahertz detector 1-10, parabolic lens 1-11, reflecting mirror
1-12, reflecting mirror 1-13, the second backward prism mirror 1-14, stepper motor, reflecting mirror 1-15, third beam splitter 1-16 and anti-
Penetrate mirror 1-17.
Femto-second laser 1-1 is transmitted in a manner of free space for generating femtosecond pulse, carries out optical path through reflecting mirror 1-2
Adjustment, be substantially carried out adjustment both horizontally and vertically.
First beam splitter 1-3 is used to for femtosecond pulse being divided into two beams, and a branch of is pump light, and another beam is detection light.
First backward prism mirror 1-5, in the optical path of pump light, light beam is squeezed into the by reflecting mirror by pump light
One backward prism mirror 1-5, the first backward prism mirror 1-5 are assemblied in progress quick retard scanning on voice coil motor 1-6.
Second beam splitter 1-8, for pump light to be divided into the two beam pump lights with identical energy, two beam pump lights pass through
Identical light path, which is beaten on Terahertz generator module 1-9, generates two beam terahertz signals.In the present embodiment, Terahertz generator
Module 1-9 can be adjusted by condenser lens, two-dimension adjustment frame and silicon lens composition, condenser lens by z-axis adjustment frame.Two dimension
Adjustment frame is for adjusting Terahertz aerial position.Terahertz generator antenna uses the GaAs of low-temperature epitaxy.
Two beam thz beams be respectively used to detection reference and sample, thz beam by parabolic lens 1-11 focus on by
Object is surveyed, is incident on corresponding terahertz detector 1-10 and is received using parabolic lens.
Light is squeezed into the second backward prism mirror 1-14, the second backward prism mirror by multiple reflecting mirrors by detection light
1-14 is assemblied on stepper motor sliding rail, carries out the light path adjustment of long range.
Third beam splitter 1-16 is divided into two beams with identical energy for that will detect light, and two beams detect light by identical
Light path is beaten on terahertz detector 1-10 for detecting two beam terahertz signals.
In the present embodiment, terahertz detector 1-10 is identical as Terahertz generator module 1-9 structure, includes a focusing
Lens and two-dimension adjustment frame and silicon lens, photoconducting antenna also use the GaAs of low-temperature epitaxy.
Automatic loading as figures 2-6 and device is varied, for conveying sample to terahertz time-domain spectroscopy detection system
Product are realized automatic loading and are varied.Greatly including control terminal 14, working end 8 and the Geneva mechanism 10 3 being placed between two parts
Part.Wherein control terminal 14 includes stepper motor, single-chip microcontroller and control program；Geneva mechanism 10 includes cutaway disk 13, turns
Arm 12, pin 11 and sheave 9；Working end 8 includes workbench 17, sample slot 1, sample presentation wheel disc 3 and sample-collecting box 7.
Check bit 4 is equipped in workbench 17；The sample presentation wheel disc 3 being rotatably installed in workbench 17, between edge has angularly
Every four sample cells 18 of distribution, the rotation of sample presentation wheel disc drives the sample to be tested in sample cell 18 to enter the check bit 4；It send
The sample slot to sample cell conveying sample to be tested is arranged in the top of sample wheel disc；Workbench side is connected with sample-collecting box 7, for collecting
The detection sample exported in the workbench 17.Driving mechanism with runner disc rotation is mounted on 17 bottom of workbench.
A chamber is equipped in workbench 17, sample presentation wheel disc 3 is located in the chamber, and cavity bottom corresponding with check bit is equipped with
Detection hole 19.The side of chamber is equipped with the output channel 6 connecting with sample-collecting box, and the bottom of output channel 6 is to extend in chamber
Output inclined-plane.
Station there are three setting in the present embodiment, in workbench, is respectively as follows: sample introduction position 2, corresponding with the position of sample slot 1, uses
In the sample to be tested for receiving the output of sample slot 1；Check bit 4, bottom are equipped with the detection hole 19；Sample position 5 out connects described
Output channel 6 has detected sample and has entered in sample-collecting box 7 in sample position out through exporting inclined-plane.The sample at 3 edge of sample presentation wheel disc of rotation
Slot passes sequentially through sample introduction position 2, check bit 4 and sample position 5 out, successively realizes feeding, detection and the output of sample to be tested.
Driving mechanism includes the first rotating shaft 15 for being protruded by workbench bottom and being linked with sample presentation wheel disc 3, with first rotating shaft
15 the second parallel shafts 16, and the stepper motor that driving second shaft 16 rotates；It installs at the middle part of first rotating shaft 15
There is sheave 9, the second shaft is equipped with the cutaway disk 13 engaged with sheave 9.
The edge of sheave 9 is equipped with several cambered surfaces 20 being bonded with cutaway disk 13, and an engagement is equipped between adjacent two cambered surface 20
Slot 21；The edge of cutaway disk 13 is equipped with a notch, and being extended by notch has pivoted arm 12, and the end of the pivoted arm 12 is equipped with and nibbles
Close the pin 11 that the cooperation of slot 21 drives sheave rotation.
Control terminal is to control the working condition of walking motor, and control mode is divided into two kinds: 1, automatically controlling: walking after triggering
First rotating a circle into motor makes first sample reach detection site, and every completion one-time detection will automatically control stepping electricity later
Machine rotates a circle, and replaces a sample and releases the sample after previous detection, total sample size is set in advance, finally
Sample release after will test after one detection just stops；2 manually control: triggering is primary, and stepper motor rotates a circle.
Geneva mechanism 10 is intermediate running part, as above-mentioned driving mechanism, first rotating shaft 15 as shown in Figure 1 with
Second shaft, 16 position is fixed (using rolling bearing structure), and rotatable, the visible Fig. 2 of relative positional relationship, respectively device
Top and bottom perspective views, 16 lower end of the second shaft can be connect with stepper motor output shaft with shaft coupling, with step motor shaft
Rotation and rotate, the second shaft 16 is connected with cutaway disk 13 and pivoted arm 12, the rotation of the second shaft 16 drive cutaway disk with
Pivoted arm rotation, when cutaway disk 13 is engaged with sheave 9, can make sheave remain static, therefore sheave will not be rotated arbitrarily,
When turning an angle, the pin 11 on pivoted arm is engaged with sheave 9, and sheave 9 is driven to rotate, the final rotation of second shaft 16 one
Week, cutaway disk 13, pivoted arm 12 and pin 11 also rotate one week, and sheave 9 rotates 90 °, and sheave and first rotating shaft 15 are connected, and first
Shaft 15 is also rotated by 90 °.
When stepper motor directly controls the rotation of the second shaft 16, motor position may be (vertical to detection light beam
Direction) impact, centre is driven using Geneva mechanism, due to the circular arc groove location of two sheaves be it is corresponding, can be with
Prevent to interfere.
Working end 8 is exactly to transport sample as requested, and initial makeup location notices that sheave 9 is corresponding with sample presentation wheel disc 3
The relative positional relationship of relationship and sample presentation wheel disc and workbench, the arc groove of sheave and the circular arc groove location pair of sample presentation wheel disc
It answers, one of arc groove of sample presentation wheel disc will just be directed at sample-collecting box.Sample presentation wheel disc and axis 2 are connected, therefore work as stepper motor
It rotates a circle, sample presentation wheel disc turns 90 °.Workbench is fixed in instrument sample storehouse, and structure is shown in Fig. 5, wherein in spectral detection
Site will design through-hole structure, also have fast replacing structure with sample-collecting box mating part, in order to make sample smoothly fall into collection
Sample box, fall to be cooperated at sample design certain downward gradient.
In the present embodiment, the process of the terahertz time-domain spectroscopy detection method based on dual-beam is as follows:
Terahertz optics system uses semiconductor terahertz sources source and the reception of 780nm femtosecond laser and low-temperature epitaxy
Device.Terahertz optics system uses the scheme of pumping-detection.
1.1560nm femto-second laser 1-1 generates the femtosecond pulse of the 1560nm wave band of bandwidth 100fs, passes through fiber coupling
Into frequency multiplier.Frequency multiplier carries out secondary frequency multiplication, is transformed into the femtosecond pulse of the 780nm of 100fs, is passed in a manner of free space
It is defeated；
2. carrying out the adjustment of optical path by a reflecting mirror, it is substantially carried out adjustment both horizontally and vertically；
3. femtosecond pulse is divided into two beams, the ratio between the transmissivity of this beam splitter and reflectivity by the first beam splitter 1-3
For 50:50, a branch of is pump light, for exciting photoconducting antenna to generate Terahertz；Another beam is detection light, for detecting Terahertz
Signal；
4. light is squeezed into the first backward prism mirror 1-5, the first backward prismatic reflection by a reflecting mirror by pump light
Mirror 1-5 is assemblied in progress quick retard scanning on voice coil motor, and is used to provide to hardware equipped with grating scale on voice coil motor
Trigger signal, precision are 2 μm；
5. pump light is beaten by a reflecting mirror in the second beam splitter 1-8, the ratio between the transmissivity of this beam splitter and reflectivity
For 50:50, femtosecond pulse is divided into the pump light that two beams have identical energy, two beam pump lights are beaten by several reflecting mirrors
Two beam terahertz signals are generated on two Terahertz generator module 1-9, the light path of two beam laser pulses is identical.
6. light is squeezed into the second backward prism mirror 1-14, the second backward prismatic reflection by two reflecting mirrors by detection light
Mirror 1-14 is assemblied on stepper motor sliding rail, carries out the light path adjustment of long range.
7. detection light beats femtosecond pulse on third beam splitter 1-16 by a reflecting mirror, the transmissivity of this beam splitter
It is 50:50 with the ratio between reflectivity, femtosecond pulse is divided into the light beam that two beams have identical energy, two beams detect light by several
For a focusing mirror on two terahertz detector module 1-9, the light path of two beam laser pulses is identical.
8. a liang beam thz beam is respectively used to detection reference and sample, thz beam is focused on by parabolic lens 1-11
Measured object is incident on corresponding terahertz detector 1-10 using parabolic lens and is received.
9. two terahertz detector 1-10 export electric signal and handle within hardware simultaneously.
In the present embodiment, experimental subjects is to be purchased from the chloropyuril of State Standard Matter Research Centre, 6-benzyl aminopurine and
Thidiazuron powder.Because polyethylene is very weak to the absorption of THz wave, the Terahertz of polyethylene powder foot couple experimental subjects is added
The position of absorption peak and intensity are without influence.Three kinds of laboratory sample powder are mixed with polyethylene powders by the mass ratio of 1:1 respectively,
Powder uses 100 mesh to be sieved after grinding in an agate mortar, is pressurizeed 4 minutes with the pressure of 30MPa, and being pressed into diameter is 13mm, thickness
The about disk-shaped wafers of 1.3-1.6mm.Obtained qualified piece sample surface is smooth, structure is uniform, without breakage, and two planes are protected
Maintain an equal level row, to reduce multipath reflection when measurement.The experimental result obtained using this optical system invented is ground with previous
Study carefully the Comparative result that personnel study discovery, both discoveries have preferable consistency, it was demonstrated that the invention has preferable feasibility.
The Terahertz of different experiments object absorbs peak position
| Experimental subjects | The previous experiment result | This inventive result |
| Chloropyuril | 1.23,1.51 and 1.92THz | 1.29,1.57 and 2.02THz |
| 6-benzyl aminopurine | 2.07THz | 2.15THz |
| Thidiazuron | And 1.95THz 1.03,1.61, | 0.99,1.58THz and 1.93THz |
The foregoing is merely preferable implementation examples of the invention, are not intended to restrict the invention, it is all in spirit of that invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of terahertz time-domain spectroscopy detection system based on dual-beam, the laser including generating femtosecond pulse, feature
It is, is provided in the optical path of the laser
Femtosecond pulse is divided into two beams by the first beam splitter, and a branch of is pump light, and another beam is detection light；
The pump light is divided into the pumping of two beams with identical energy in the optical path of the pump light by the second beam splitter
Light；
Two groups of Terahertz generator modules are separately positioned in the optical path of two beam pump lights, for generating two beam terahertz signals,
It is respectively used to detection reference and sample；
Two groups of terahertz detectors are respectively used to receive described with reference to the terahertz signal issued with sample and output；
The detection light is divided into the pumping of two beams with identical energy in the optical path of the detection light by third beam splitter
Light respectively enters in two groups of terahertz detectors.
2. the terahertz time-domain spectroscopy detection system based on dual-beam as described in claim 1, which is characterized in that in the pump
In the optical path of Pu light, the first backward prism mirror driven by voice coil motor is set.
3. the terahertz time-domain spectroscopy detection system based on dual-beam as described in claim 1, which is characterized in that in the spy
It surveys in the optical path of light, the first backward prism mirror driven by stepper motors is set.
4. the terahertz time-domain spectroscopy detection system based on dual-beam as described in claim 1, which is characterized in that further include defeated
It send the automatic sampling of the sample and varies device, comprising:
Workbench, it is interior to be equipped with check bit；
The sample presentation wheel disc being rotatably installed in the workbench, edge setting at least sample groove, the rotation of sample presentation wheel disc drive sample
Sample to be tested in product slot enters the check bit；
To the sample slot of sample cell conveying sample to be tested；
Sample-collecting box positioned at the workbench side collects the detection sample exported in the workbench；
And drive the driving mechanism of the sample presentation wheel disc rotation.
5. the terahertz time-domain spectroscopy detection system based on dual-beam as claimed in claim 4, which is characterized in that the work
Make to be equipped with chamber in platform, sample presentation wheel disc is located in the chamber, and cavity bottom corresponding with the check bit is equipped with detection hole；
The side of the chamber is equipped with the output channel connecting with the sample-collecting box, and the bottom of the output channel, which is equipped with, to be extended to
The indoor output inclined-plane of chamber.
6. the terahertz time-domain spectroscopy detection system based on dual-beam as claimed in claim 5, which is characterized in that the work
Make to set that there are three stations in platform, is respectively as follows:
Sample introduction position, it is corresponding with the position of sample slot, for receiving the sample to be tested of sample slot output；
Check bit, bottom are equipped with the detection hole；
Sample position out connects the output channel, has detected sample and has entered in sample-collecting box in sample position out through exporting inclined-plane；
The sample cell of the sample presentation wheel plate edge of rotation passes sequentially through the sample introduction position, check bit and sample position out.
7. the terahertz time-domain spectroscopy detection system based on dual-beam as claimed in claim 4, which is characterized in that the drive
Motivation structure includes the first rotating shaft for being protruded by workbench bottom and being linked with the sample presentation wheel disc, parallel with the first rotating shaft
Second shaft, and the driving assembly of driving the second shaft rotation；
Sheave is installed, the second shaft is equipped with the cutaway disk engaged with the sheave in the middle part of the first rotating shaft.
8. the terahertz time-domain spectroscopy detection system based on dual-beam as claimed in claim 7, which is characterized in that the sheave
Edge be equipped with several cambered surfaces being bonded with the cutaway disk, equipped with an engaging groove between adjacent two cambered surface；
There is the pin that the sheave rotation is driven with engaging groove cooperation on the cutaway disk, the cutaway disk
Edge is equipped with a notch, and being extended by the notch has pivoted arm, and pin is located at the end of the pivoted arm.
9. the terahertz time-domain spectroscopy detection system based on dual-beam as claimed in claim 8, which is characterized in that the drive
Dynamic component is the stepper motor connecting with second shaft.
10. a kind of terahertz time-domain spectroscopy detection method based on dual-beam, which is characterized in that appoint using in claim 1~9
Terahertz time-domain spectroscopy detection system described in item of anticipating is realized, comprising the following steps:
(1) laser generates femtosecond pulse, is divided into two beams through the first beam splitter, a branch of is pump light, and another beam is detection light；
(2) light beam is squeezed into retroreflector by reflecting mirror by pump light, and retroreflector is assemblied on voice coil motor and carries out fastly
Fast delayed sweep；
(3) pump light is divided into the two beam pump lights with identical energy by the second beam splitter, and two beam pump lights are by identical
Light path, which is beaten respectively on two Terahertz generator modules, generates two beam terahertz signals, and two beam thz beams are respectively used to examine
Reference and sample are surveyed, thz beam focuses on measured object by parabolic lens, is incident to corresponding Terahertz using parabolic lens
It is received on detector；
(4) light is squeezed into retroreflector by multiple reflecting mirrors by detection light, and retroreflector is assemblied on stepper motor sliding rail,
Carry out the light path adjustment of long range；
(5) detection light is divided into the detection light of two beams with identical energy by third beam splitter, and two beams detect light by identical
Light path is beaten on terahertz detector for detecting two beam terahertz signals；
(6) two terahertz detector modules export electric signal and are handled simultaneously.
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