CN208795653U - A kind of terahertz time-domain spectroscopy system of background and sample signal synchro measure - Google Patents
A kind of terahertz time-domain spectroscopy system of background and sample signal synchro measure Download PDFInfo
- Publication number
- CN208795653U CN208795653U CN201820605681.8U CN201820605681U CN208795653U CN 208795653 U CN208795653 U CN 208795653U CN 201820605681 U CN201820605681 U CN 201820605681U CN 208795653 U CN208795653 U CN 208795653U
- Authority
- CN
- China
- Prior art keywords
- thz
- lock
- amplifier
- detector
- background
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000001328 terahertz time-domain spectroscopy Methods 0.000 title claims abstract description 19
- 230000003287 optical effect Effects 0.000 claims abstract description 19
- 230000005540 biological transmission Effects 0.000 claims abstract description 9
- 230000008878 coupling Effects 0.000 claims abstract description 4
- 238000010168 coupling process Methods 0.000 claims abstract description 4
- 238000005859 coupling reaction Methods 0.000 claims abstract description 4
- 239000000835 fiber Substances 0.000 claims abstract description 4
- 238000001514 detection method Methods 0.000 claims description 10
- 230000003111 delayed effect Effects 0.000 claims description 3
- 229910007709 ZnTe Inorganic materials 0.000 claims description 2
- 239000013078 crystal Substances 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 9
- 238000012360 testing method Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 5
- 230000003595 spectral effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical compound O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The utility model discloses the terahertz time-domain spectroscopy system of a kind of background and sample signal synchro measure, including femto-second laser, chopper, M1 beam splitter, THz transmitter, H1 paraboloidal mirror, N1 reflecting mirror, N2 reflecting mirror, H2 paraboloidal mirror, M2 beam splitter, Postponement module, Q1 THz detector, THz beam splitter, H3 paraboloidal mirror, Q2 THz detector, lock-in amplifier and computer, between Postponement module and computer, between chopper and lock-in amplifier, between Q1 THz detector and lock-in amplifier, between Q2 THz detector and lock-in amplifier, it is connected between lock-in amplifier and computer using data line, rest part is light path part, it is transmitted using free space transmission or fiber coupling.By designing the optical path of synchro measure background signal and sample signal, background fluctuations situation during enabling Terahertz background signal really to reflect sample test eliminates background signal in measurement process and fluctuates influence to measurement result.
Description
Technical field
The utility model belongs to Terahertz Technology field, is related to terahertz time-domain spectroscopy measuring technology, especially a kind of back
The terahertz time-domain spectroscopy system of scape and sample signal synchro measure, background and sample signal suitable for terahertz time-domain spectroscopy
Synchro measure.
Background technique
THz wave refers to electromagnetic wave of the frequency between (0.1 ~ 10) THz, between far infrared and millimeter wave.Too
Hertz wave has the excellent characteristics such as good medium penetrability, low ionization energy and coherence, therefore in material science, Information Center
The key areas such as, aerospace have broad application prospects.
Terahertz time-domain spectroscopy system is using terahertz time-domain spectroscopic technology measurement specimen material in terahertz wave band light
The instrument of spectral property.Terahertz time-domain spectroscopy instrument is widely used in material composition identification, explosive detection, biological test sample
And the various fields such as gas-monitoring.
When carrying out sample test using terahertz time-domain spectroscopy instrument, it usually needs when first measuring one that sample is not added
Background terahertz signal；Then it is put into sample to be tested in sample optical path, measures sample to be tested in terahertz wave band
Terahertz light spectrum signal, two signals, which are divided by, can obtain sample in the transmission or reflection spectral information of terahertz wave band.By
It is changed over time in background signal, measuring bias light and the temporal sequencing of signal light leads to sample signal and background signal
Compared to when, cannot really reflect background signal when sample test.
Utility model content
The technical problem to be solved by the present invention is to provide when the Terahertz of a kind of background and sample signal synchro measure
Domain spectroscopic system designs the optical path of synchro measure background signal and sample signal, can obtain in sample measurement simultaneously
Real background signal, eliminating background signal fluctuation bring influences, and obtains the true spectral transmittance signal of sample, and then improve
The reliability of terahertz wave band sample measurement.
The technical solution of the utility model is as follows:
A kind of terahertz time-domain spectroscopy system of background and sample signal synchro measure, including femto-second laser, chopper,
M1 beam splitter, THz transmitter, H1 paraboloidal mirror, N1 reflecting mirror, N2 reflecting mirror, H2 paraboloidal mirror, M2 beam splitter, Postponement module,
Q1 THz detector, THz beam splitter, H3 paraboloidal mirror, Q2 THz detector, lock-in amplifier and computer, Postponement module with
Between computer, between chopper and lock-in amplifier, between Q1 THz detector and lock-in amplifier, Q2 THz detector with
It is connected between lock-in amplifier, between lock-in amplifier and computer using data line, rest part is light path part, using certainly
It is transmitted by space propagation or fiber coupling.
Femtosecond laser is divided into A1 pump light through M1 beam splitter and A2 detects light, and A2 is detected after light passes through Postponement module to be divided through M2
Shu Jing passes to Q2 THz detector all the way, and another way passes to Q1 detector through N1 reflecting mirror and N2 reflecting mirror；A1 pump light
It excites THz transmitter to generate THz wave after into THz transmitter, is carried out again by THz beam splitter after H1 paraboloidal mirror collimation
Optical path beam splitting, enters Q2THz detector through H3 paraboloidal mirror for sample optical path all the way, and another way is background optical path warp
H2 paraboloidal mirror enters Q1 THz detector.
For chopper for being modulated to femtosecond laser and providing reference signal to lock-in amplifier, M1 beam splitter is used for will
The femtosecond laser that femtosecond pulse laser issues is divided into pump light and detection light, and THz transmitter is for generating terahertz pulse letter
Number, for THz wave to be collimated and focused, N1 reflecting mirror, N2 are anti-for H1 paraboloidal mirror, H2 paraboloidal mirror, H3 paraboloidal mirror
Mirror is penetrated for changing optical propagation direction, M2 beam splitter is divided into two beams for that will detect light, and Postponement module prolongs for changing detection light
When terahertz pulse signal is scanned, Q1 THz detector, Q2 THz detector for detecting terahertz pulse signal,
THz beam splitter is used to for terahertz light being divided into background measurement light and sample measures light, and lock-in amplifier is for acquiring and amplifying too
Hertz signal, computer are used for terahertz time-domain spectroscopy signal processing.
Photoconductive antenna can be selected in THz transmitter, is mainly used for generating terahertz emission in the case where femtosecond pulse motivates
Wave.ZnTe crystal may be selected in Q1 THz detector, Q2 THz detector, is mainly used for THz wave detection.Postponement module is general
For mechanical delayed sweep line, for generating a series of optical path difference.
Particularly, THz beam splitter is mainly used for being split incident THz wave on it.THz beam splitter will enter
The THz wave penetrated is divided into transmission THz wave and reflected terahertz hereby wave, and transmission THz wave is for sample under terahertz wave band
Transmitted spectrum signal measurement, reflected terahertz hereby wave for background signal measure.The energy by means of the light splitting effect of THz beam splitter
Enough synchro measure background signals and sample signal, Terahertz background signal can really reflect the background wave during sample test
Emotionally condition.
The effect and benefit of the utility model are:
(1) the terahertz time-domain spectroscopy system, by designing the optical path of synchro measure background signal and sample signal, so that
Terahertz background signal can really reflect the background fluctuations situation during sample test；
(2) synchro measure process can be reduced in traditional test methods due to background signal and sample signal measurement process
It is asynchronous and cause sample transmission signal measurement inaccurate, the true spectral transmittance signal of sample can be obtained.
Detailed description of the invention
Fig. 1 terahertz time-domain spectroscopy systematic schematic diagram.
In figure: 1 femto-second laser；2 choppers；3 M1 beam splitters；4 THz transmitters；5 H1 paraboloidal mirrors；6 N1 are anti-
Penetrate mirror；7 N2 reflecting mirrors；8 H2 paraboloidal mirrors；9 M2 beam splitters；10 Postponement modules；11 Q1 THz detectors；12 THz points
Shu Jing；13 H3 paraboloidal mirrors；14 Q2 THz detectors；15 lock-in amplifiers；16 computers.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
A kind of terahertz time-domain spectroscopy system, as shown in Figure of description 1, including femto-second laser 1, chopper 2, M1 points
Beam mirror 3, THz transmitter 4, H1 paraboloidal mirror 5, N1 reflecting mirror 6, N2 reflecting mirror 7, H2 paraboloidal mirror 8, M2 beam splitter 9, delay mould
Block 10, Q1 THz detector 11, THz beam splitter 12, H3 paraboloidal mirror 13, Q2 THz detector 14, lock-in amplifier 15 and meter
Calculation machine 16, between Postponement module 10 and computer 16, between chopper 2 and lock-in amplifier 15, Q1 THz detector 11 and lock
It is adopted between phase amplifier 15, between Q2 THz detector 14 and lock-in amplifier 15, between lock-in amplifier 15 and computer 16
It is connected with data line, rest part is light path part, is transmitted using free space transmission or fiber coupling.
Femtosecond laser divides through M1 beam splitter 3 detects light for A1 pump light and A2, and A2 detection light passes through after passing through Postponement module 10
9 one tunnel of M2 beam splitter passes to Q2 THz detector 14, and another way passes to Q1 detector through N1 reflecting mirror 6 and N2 reflecting mirror 7
11；A1 pump light enters excitation THz transmitter 4 after THz transmitter 4 and generates THz wave, after the collimation of H1 paraboloidal mirror 5 again by
THz beam splitter 12 carries out optical path beam splitting, enters Q2 THz detector 14 through H3 paraboloidal mirror 13 for sample optical path all the way, separately
Enter Q1 THz detector 11 through H2 paraboloidal mirror 8 for background optical path all the way.
Embodiment
Terahertz time-domain spectroscopy system operation methods:
A) output power of femto-second laser 1 is monitored using power meter, will be flown according to the requirement of THz transmitter 4
The second output power of laser 1 is adjusted to suitable position；
B) femtosecond laser for exporting femto-second laser 1 is traditionally arranged to be 3kHz by chopper 2, the frequency of chopper 2；
C) it will be divided into two bundles by the femtosecond laser of chopper 2 using M1 beam splitter 3, it is a branch of to be excited as A1 pump light
THz transmitter 4 generates terahertz pulse signal, and another Shu Zuowei A2 detection light enters Postponement module 10；
D) terahertz pulse that THz transmitter 4 issues divides through THz beam splitter 12 for transmission THz wave and reflected terahertz hereby
Wave, transmission THz wave are measured for sample, and hereby wave measures reflected terahertz for background；
E) THz wave on background optical path and sample optical path is respectively by H2 paraboloidal mirror 8 and H3 paraboloidal mirror
It is incident to Q1 THz detector 11 and Q2 THz detector 14 respectively after 13 focusing, the detection light after delayed module 10 is also conllinear
Into Q1 THz detector 11 and Q2 THz detector 14；
F) voltage signal that the electricity output port of Q1 THz detector 11 and Q2 THz detector 14 generates is directly connected to
To two signal input ports of lock-in amplifier 15；
G) electrical signal of chopper 2 is connected to the reference signal input terminal of lock-in amplifier 15, by copped wave
The modulating frequency of device 2 demodulates sampled signal as the reference signal of lock-in amplifier 15；
H) computer 16 controls Postponement module 10 and is moved according to the stepping-in amount of setting, and detection light is made to generate a series of pass
The optical path difference of increasing, while controlling lock-in amplifier 15 and the Q1 THz detector 11 and Q2 THz detector 14 of each stepping are exported
Electric signal sampled；
I) it is scanned by the step-by-step movement of the entire stroke of Postponement module 10, computer 16 can sample to obtain terahertz pulse
Time domain waveform.
Figure of description is only used as the schematic illustration of the system, and actual product structure snd size are designed with inventor and produced
Subject to drawing.
Embodiment described above is only that the embodiments of the present invention is described, not to the utility model
Conception and scope be defined.Without departing from the design concept of the present utility model, ordinary people in the field is to this reality
The all variations and modifications made with novel technical solution, should fall within the protection scope of the present utility model, this is practical new
The range of type is indicated by the appended claims rather than the foregoing description, it is intended that containing for the equivalent requirements of the claims will be fallen in
All changes in justice and range are embraced therein, and should not treat any reference in the claims as limiting
Related claim.
Claims (4)
1. the terahertz time-domain spectroscopy system of a kind of background and sample signal synchro measure, which is characterized in that including femtosecond laser
Device (1), chopper (2), M1 beam splitter (3), THz transmitter (4), H1 paraboloidal mirror (5), N1 reflecting mirror (6), N2 reflecting mirror
(7), H2 paraboloidal mirror (8), M2 beam splitter (9), Postponement module (10), Q1 THz detector (11), THz beam splitter (12), H3
Paraboloidal mirror (13), Q2 THz detector (14), lock-in amplifier (15) and computer (16), the Postponement module (10) and meter
Between calculation machine (16), between chopper (2) and lock-in amplifier (15), Q1 THz detector (11) and lock-in amplifier (15) it
Between, between Q2 THz detector (14) and lock-in amplifier (15), number is used between lock-in amplifier (15) and computer (16)
It is connected according to line, rest part is light path part, is transmitted using free space transmission or fiber coupling；Femtosecond laser is through the M1 points
Shu Jing (3) is divided into A1 pump light and A2 detection light, and A2 detection light passes through Postponement module (10) by M2 beam splitter (9) all the way
Q2 THz detector (14) is passed to, another way passes to Q1 detector (11) through N1 reflecting mirror (6) and N2 reflecting mirror (7)；Institute
State A1 pump light enter THz transmitter (4) excite afterwards THz transmitter (4) generate THz wave, through H1 paraboloidal mirror (5) collimate
Optical path beam splitting is carried out by THz beam splitter (12) again afterwards, is visited all the way through H3 paraboloidal mirror (13) into Q2THz for sample optical path
It surveys device (14), another way enters Q1 THz detector (11) through H2 paraboloidal mirror (8) for background optical path.
2. the terahertz time-domain spectroscopy system of a kind of background according to claim 1 and sample signal synchro measure, special
Sign is: the THz transmitter (4) selects photoconductive antenna, is mainly used for generating Terahertz in the case where femtosecond pulse motivates
Radiated wave.
3. the terahertz time-domain spectroscopy system of a kind of background according to claim 1 and sample signal synchro measure, special
Sign is: the Q1 THz detector (11), Q2 THz detector (14) select ZnTe crystal, are mainly used for THz wave spy
It surveys.
4. the terahertz time-domain spectroscopy system of a kind of background according to claim 1 and sample signal synchro measure, special
Sign is: the Postponement module (10) is mechanical delayed sweep line, for generating a series of optical path difference.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820605681.8U CN208795653U (en) | 2018-04-26 | 2018-04-26 | A kind of terahertz time-domain spectroscopy system of background and sample signal synchro measure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820605681.8U CN208795653U (en) | 2018-04-26 | 2018-04-26 | A kind of terahertz time-domain spectroscopy system of background and sample signal synchro measure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208795653U true CN208795653U (en) | 2019-04-26 |
Family
ID=66199638
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820605681.8U Expired - Fee Related CN208795653U (en) | 2018-04-26 | 2018-04-26 | A kind of terahertz time-domain spectroscopy system of background and sample signal synchro measure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208795653U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108844913A (en) * | 2018-04-26 | 2018-11-20 | 中国工程物理研究院计量测试中心 | A kind of terahertz time-domain spectroscopy system and operating method |
-
2018
- 2018-04-26 CN CN201820605681.8U patent/CN208795653U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108844913A (en) * | 2018-04-26 | 2018-11-20 | 中国工程物理研究院计量测试中心 | A kind of terahertz time-domain spectroscopy system and operating method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108844913A (en) | A kind of terahertz time-domain spectroscopy system and operating method | |
| CN202631110U (en) | Terahertz time domain double spectrum detecting system | |
| CN105911531B (en) | A kind of device for phased array antenna field calibration | |
| CN106441580B (en) | The incident terahertz time-domain spectroscopy instrument for surveying transmission and reflection simultaneously of variable-angle | |
| CN105699317A (en) | Terahertz time-domain spectrograph capable of entering at fixed angle and simultaneously detecting transmission and reflection | |
| CN2874476Y (en) | Terahertz time domain spectral instrument based on optical rectification | |
| CN110376125B (en) | Transient absorption spectrum measuring system and method | |
| CN105784634A (en) | Terahertz time domain spectrograph capable of measuring transmission and reflection simultaneously under vertical incidence | |
| CN108007901B (en) | A kind of method and apparatus detecting multicomponent trace gas concentration | |
| CN110401492A (en) | A kind of radio amplitude-modulated signal method of reseptance and amplitude modulation Quantum receiver based on quantum effect | |
| CN104864817B (en) | Plastic film thickness detection means and method based on terahertz time-domain spectroscopic technology | |
| CN107328738B (en) | A kind of double gas chamber trace gas analysis systems and gas concentration calculating method of connecting | |
| Chen et al. | Terahertz-wave imaging system based on backward wave oscillator | |
| CN109030406B (en) | Terahertz frequency spectrum calibration system and method | |
| CN107462849B (en) | Device and method for measuring radio frequency line transmission factor based on atomic energy level | |
| CN102680099A (en) | Method and system for generating and detecting terahenz pulse | |
| CN108593591A (en) | A kind of spectrum transflection of terahertz time-domain spectroscopy system compares scaling method | |
| Yasui et al. | Absolute distance measurement of optically rough objects using asynchronous-optical-sampling terahertz impulse ranging | |
| AU2015327741A1 (en) | Cavity enhanced spectroscopy using off-axis paths | |
| CN110376156A (en) | The THz wave spectra system that asynchronous optical sampling and double light combs integrate | |
| CN107655832B (en) | Based on the femtosecond Two-dimensional spectroscopy acquisition method converted in chirp and system | |
| CN209590271U (en) | A kind of measuring device of space length | |
| CN208795653U (en) | A kind of terahertz time-domain spectroscopy system of background and sample signal synchro measure | |
| CN109142266B (en) | Terahertz fine spectrum detector | |
| CN206945533U (en) | Minimize terahertz time-domain spectroscopy instrument |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190426 |