CN104749130A - Quick scanning method of terahertz time-domain spectroscopic system - Google Patents
Quick scanning method of terahertz time-domain spectroscopic system Download PDFInfo
- Publication number
- CN104749130A CN104749130A CN201410725020.5A CN201410725020A CN104749130A CN 104749130 A CN104749130 A CN 104749130A CN 201410725020 A CN201410725020 A CN 201410725020A CN 104749130 A CN104749130 A CN 104749130A
- Authority
- CN
- China
- Prior art keywords
- time
- terahertz
- scanning galvanometer
- driving voltage
- data
- 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.)
- Granted
Links
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a quick scanning method of a terahertz time-domain spectroscopic system. The method comprises the following steps: simultaneously reading a position driving voltage of a scanning galvanometer from the scanning galvanometer and a differential current signal from a photoelectric balanced detector by using a lock-in amplifier in a reading time period based on a reading command of a control device; sending the position driving voltage and the differential current signal as a data element to the control device by the lock-in amplifier; sequentially caching the data element in a pre-established data queue by using an acquisition unit of the control device; extracting the cached data element from the data queue by using a processing unit of the control device, with a differential current of the differential detector in the data element as a vertical coordinate of a terahertz time-domain waveform, converting the position driving voltage of the scanning galvanometer into duration of a terahertz pulse, displaying in real time by taking the duration as a horizontal coordinate of the terahertz time-domain waveform, and then deleting the extracted data element from the data queue after processing.
Description
Technical field
The present invention relates to terahertz time-domain spectroscopy system scanning technique, particularly relate to the fast scanning method of terahertz time-domain spectroscopy system.
Background technology
Terahertz time-domain spectroscopy system can gather violated chemicals such as all kinds of single chmical compound explosive, drugs, at the chaacteristic fingerprint spectrum of terahertz wave band, the Terahertz frequency range absorption spectra of test sample and normal data are composed the fingerprint absorption spectra comparing of the violated chemicals in storehouse, effectively can identify the kind of checking matter.
Usually, the collection of Terahertz (THz) time domain waveform needs to gather the position with the translation stage of step-scan motor realization, and the position of the translation stage of collection is converted into the time as horizontal ordinate, lock-in amplifier reads the difference photocurrent of flat horizontal detector as ordinate, and depicts terahertz time-domain waveform based on obtained horizontal ordinate and ordinate value.In gatherer process, translation stage the position of process pre-set by computing machine, and the position command preset is passed to translation stage controller, and translation stage controller moves to assigned address and is parked in this position, wait at this position reading marking current; Afterwards, then move to next position, then read the marking current of next position.Obviously, the poor efficiency that a this step one is stopped, a data acquisition modes stopping reading result in sweep velocity, cannot adapt to the needs of practical application.
Summary of the invention
Embodiments provide a kind of fast scanning method of terahertz time-domain spectroscopy system, take the scanning galvanometer of continuous high speed motion to substitute the translation stage of original step-scan motor, and devise data acquisition plan, improve the sweep speed of terahertz time-domain spectroscopy system, make terahertz time-domain spectroscopy system more adapt to the needs of practical application.
According to an aspect of the present invention, provide a kind of fast scanning method of terahertz time-domain spectroscopy system, described terahertz time-domain spectroscopy system configuration has the scanning galvanometer of the continuous high speed motion being arranged in pumping light path, described scanning galvanometer is connected to lock-in amplifier, photoelectricity balanced detector is connected to the signal input port of described lock-in amplifier, described lock-in amplifier is connected to control device through GPIB communication port, described method comprises: in response to the reading order from described control device, reading m time point in the time period, described lock-in amplifier reads the position driving voltage of described scanning galvanometer from described scanning galvanometer simultaneously and reads from the horizontal detector of described light level the differential current signal be directly proportional to terahertz signal electric field intensity, wherein m is natural number, the position driving voltage of each time point in the m of a reading time point and differential current signal are sent to described control device by described lock-in amplifier, as a data element,
Described m data unit buffers in the data queue be pre-created by described collecting unit by the collecting unit of described control device successively; The processing unit of described control device extracts the data element of buffer memory from described data queue, the difference current of the differential detector in the data element of extraction is shown as the ordinate of terahertz time-domain waveform and the duration t that the position driving voltage of scanning galvanometer is converted to terahertz pulse in real time as the horizontal ordinate of terahertz time-domain waveform, and from data queue, delete the data element of this extraction after the treatment
Δ x is the distance of scanning galvanometer movement, and c is the light velocity.
Wherein, described data element is two-dimensional array, and first of this two-dimensional array is classified as the position driving voltage of scanning galvanometer, the second amplitude being classified as the time domain waveform of described differential current signal.
According to the present invention, described scanning galvanometer adopts asymmetric triangular wave mode of motion, and the position driving voltage that described lock-in amplifier reads described scanning galvanometer from described scanning galvanometer simultaneously and the step reading the differential current signal be directly proportional to terahertz signal electric field intensity from described photoelectricity balanced detector are specially:
In the negative maximal value of described asymmetric triangular wave to each of m time point of the rise time section of positive maximal value, described lock-in amplifier reads the position driving voltage of described scanning galvanometer from described scanning galvanometer simultaneously and reads the differential current signal be directly proportional to terahertz signal electric field intensity from described photoelectricity balanced detector.
Wherein, in the positive maximal value of described asymmetric triangular wave to fall time of negative maximal value in section: described lock-in amplifier stops reading described position driving voltage and differential current signal.
Further, the described reading time period comprises N number of cycle of asymmetric triangular wave, and comprise k time point in each cycle, k=m/N, k and N are natural number;
Using the difference current of the differential detector in data element as the ordinate of time domain waveform and the position driving voltage of scanning galvanometer is carried out display in real time as the horizontal ordinate of time domain waveform step before, described processing unit:
A) divided by N after the position driving voltage of i-th time point in the time point of the k in N number of cycle being added up, as the position driving voltage of i-th time point;
B) divided by N after the difference current of i-th time point in the time point of the k in N number of cycle being added up, as the difference current of i-th time point, wherein i=1,2,3 ..., k.
Further, if the described reading time period comprises H cycle of asymmetric triangular wave, and H is greater than N, and H is natural number, then step a) before, described processing unit is further:
Data element in the H-N of the reading cycle is rejected;
Based on from H-N+1 cycle to H cycle, perform step a) and b).
Described fast scanning method, comprises further: described terahertz time-domain waveform is carried out Fourier transform, obtain the frequency-domain waveform data of Terahertz, draws terahertz signal with the curve of frequency change show according to these data.
In the present invention, for terahertz time-domain spectroscopy system, traditional stepping electronic control translation stage is substituted as lag line by installing a scanning galvanometer in terahertz time-domain spectroscopy system, scanning galvanometer can realize the movement of continuous high speed, coordinate with the control program of the applicable rapid scanning side of such as Labview language compilation, achieve the raising of the sweep velocity of time-domain spectroscopy system, make time-domain spectroscopy system more practical.
Accompanying drawing explanation
Fig. 1 is terahertz time-domain spectroscopy system diagram.
Fig. 2 is the data acquisition plan figure of the rapid scanning of the terahertz time-domain spectroscopy system of the embodiment of the present invention.
Fig. 3 shows the process flow diagram of the fast scanning method of terahertz time-domain spectroscopy system according to an embodiment of the invention.
Fig. 4 shows the process flow diagram of the fast scanning method of terahertz time-domain spectroscopy system according to another embodiment of the invention.
Fig. 5 shows the heuristic scanner structural drawing realized with Labview language.
Fig. 6 shows the interface sectional drawing of the program of the fast scanning method implementing terahertz time-domain spectroscopy system of the present invention.
Fig. 7 shows the terahertz time-domain oscillogram being configured with the measurement of the terahertz time-domain spectroscopy system of scanning galvanometer adopting the method for embodiments of the invention to obtain.
Fig. 8 is Terahertz waveform acquisition principle schematic diagram.
Embodiment
For making object of the present invention, technical scheme and advantage clearly understand, enumerate preferred embodiment referring to accompanying drawing, the present invention is described in more detail.But it should be noted that, the many details listed in instructions are only used to make reader to have a thorough understanding, even if do not have these specific details also can realize these aspects of the present invention to one or more aspect of the present invention.
In the technical scheme of the embodiment of the present invention, for terahertz time-domain spectroscopy system, traditional stepping electronic control translation stage is substituted as lag line by installing a scanning galvanometer in terahertz time-domain spectroscopy system, scanning galvanometer can realize the movement of continuous high speed, coordinate and be applicable to rapid scanning Survey control program, such as, with the scanning survey control program of Labview language compilation, achieve the raising of the sweep velocity of terahertz time-domain spectroscopy system, make time-domain spectroscopy system more practical.
The technical scheme of the embodiment of the present invention is described in detail below in conjunction with accompanying drawing.
As shown in Figure 1, terahertz time-domain spectroscopy system is shown.As shown in Figure 1, use scanning galvanometer to substitute traditional electronic control translation stage as lag line in the present invention, be installed in pumping light path.Except scanning galvanometer substituted for traditional electronic control translation stage, the terahertz time-domain spectroscopy system of Fig. 1 is known, omits detailed description at this.In the terahertz time-domain spectroscopy system of Fig. 1, completed the change of the optical path difference between THz wave and exploring laser light pulse by the high-speed mobile of scanning galvanometer, realize the scanning of terahertz time-domain waveform, waveform scanning theory as shown in Figure 8.Wherein, exploring laser light pulse detects by putting down horizontal detector, and exports differential current signal.
Fig. 2 shows the data acquisition plan figure of the rapid scanning of the terahertz time-domain spectroscopy system of the embodiment of the present invention.As shown in Figure 2, the output voltage interface of the rear panel of scanning galvanometer being connected to the AUX interface of lock-in amplifier, for reading the position driving voltage of scanning galvanometer, thus determining the instantaneous position of scanning galvanometer.The mode of motion of scanning galvanometer can pre-set, such as, the mode of motion of scanning galvanometer can be set to the mode of asymmetric triangular wave.In Fig. 2, photoelectricity balanced detector is connected to the signal input port of lock-in amplifier to read difference photocurrent.The data read are connected to control device by GPIB (general purpose interface bus) communication port by lock-in amplifier, and the data for the reading by lock-in amplifier pass to control device.Control device comprises collecting unit and processing unit.The data of reading are formed a two-dimensional array by collecting unit, wherein, the first not positional information being in the same time classified as scanning galvanometer, second is classified as difference photocurrent values when scanning galvanometer is in diverse location, and this value is proportional to the electric field magnitude of terahertz time-domain waveform.
Fig. 3 shows the process flow diagram of the fast scanning method of terahertz time-domain spectroscopy system according to an embodiment of the invention.In step 302, control device sends reading order to lock-in amplifier.In step 304, in response to the reading order from described control device, reading m time point in the time period, lock-in amplifier reads the position driving voltage of described scanning galvanometer from scanning galvanometer, and simultaneously from the differential current signal that the horizontal detector of light level reads, this differential current signal is directly proportional to terahertz signal electric field intensity, and wherein m is natural number.
Next, in step 306, the position driving voltage of each time point in the m of a reading time point and differential current signal are sent to control device by lock-in amplifier, as a data element.In step 308, the m data of reception unit buffers in the data queue be pre-created by described collecting unit by the collecting unit of control device successively.
In step 310, the processing unit of control device extracts the data element of buffer memory from data queue.In step 312, the differential current signal of the differential detector in the data element of extraction is shown as the ordinate of terahertz time-domain waveform and duration of the position driving voltage of scanning galvanometer being converted to terahertz pulse in real time as the horizontal ordinate of terahertz time-domain waveform, and from data queue, delete the data element of this extraction after the treatment, wherein
Δ x is the distance of scanning galvanometer movement, and c is the light velocity.Such as, Fig. 7 shows the terahertz time-domain oscillogram being configured with the measurement of the terahertz time-domain spectroscopy system of scanning galvanometer adopting the method for embodiments of the invention to obtain.
In step 314, terahertz time-domain waveform is carried out Fourier transform by the processing unit of control device, obtains the frequency-domain waveform data of Terahertz, and its horizontal ordinate is frequency, ordinate is the component of difference current in each frequency, carries out the display of frequency curve according to this Wave data.Afterwards, flow process ends at step 316.
Fig. 4 shows the process flow diagram of the fast scanning method of terahertz time-domain spectroscopy system according to another embodiment of the invention.The embodiment of Fig. 4 is substantially identical with example shown in Fig. 3, and difference is also to comprise step 3102 between step 310 and 312, and 3104 and 3106.
In embodiments of the invention, consider in the quick sampling process of waveform, shorten the integral time of lock-in amplifier, can cause the increase of noise, the scanning therefore for terahertz time-domain spectroscopy system takes multiple time domain waveform to carry out the design superposed.In other words, N number of time cycle can be established in advance, N number of time cycle of such as asymmetric triangular wave, in this N number of time cycle, carry out data acquisition.In this case, in each time cycle, all gather the data (comprising position driving voltage and differential current signal) of k time point, wherein k is natural number and k=m/N.
In step 3104, divided by N after described processing unit is cumulative by the position driving voltage of i-th time point in the time point of the k in N number of cycle, as the position driving voltage of i-th time point.In step 3106, divided by N after described processing unit is cumulative by the difference current of i-th time point in the time point of the k in N number of cycle, as the difference current of i-th time point, wherein i=1,2,3 ..., k.
Alternatively, if actual acquisition H time cycle, H is natural number and is greater than N, and so when the waveform gathered exceeds N number of, the data that first time gathers are by deleted, and the data of N+1 group are added into; The data that second time gathers are deleted, and the data of N+2 group are added into, the like, processing unit always keeps adopting N number of data element to be averaged.That is, in step 3102, the data element in the H-N of the reading cycle is rejected; Based on from H-N+1 cycle to H cycle, perform step 3104 and 3106.Obviously, if H and N is identical, then there is not step 3102.
Example
The fast scanning method of terahertz time-domain spectroscopy system of the present invention can comprise data sampling and processing two parts, adopts " producer/consumer " structure.Such as, Fig. 5 shows the heuristic scanner structural drawing realized with Labview language, structure that it adopts " producer/consumer ".In the structure shown in Fig. 5, a circulation is used as the collection of data, and Data Management Analysis and result display are carried out in another circulation.In this example, adopt data queue as buffer memory, the data newly collected directly are put in queue.Adopt this structure, seldom consuming time; Data acquisition how soon, just can how soon speed leave in buffer memory.Data are ceaselessly taken out in Data Management Analysis and result display section from queue, process, and treated data deleted from queue, to vacate the space in buffer memory the data read.The advantage of " producer/consumer " is adopted to be to avoid due to two independently some problems of causing of circular flow cycle difference, as be less than data processing when data collection cycle cycle time, the data gathered will be recycled, the cycle of data processing is greater than when the cycle of image data, the data gathered can not process timely, will be caused the loss of data by the data cover that newly gathers.
In the heuristic scanner structural drawing that Fig. 5 realizes with Labview language, program realizes following function:
Part I, data acquisition, reads the position driving voltage of scanning galvanometer and difference photocurrent by lock-in amplifier, forms two-dimensional array, the first position driving voltage being classified as scanning galvanometer, the second amplitude being classified as the time domain waveform of differential current signal.
Part II, the data collected are for forming two-dimensional array, but not all data point is all needs.Such as, when scanning galvanometer adopt be non-symmetric triangular wave motion pattern time, when scanning galvanometer in the negative largest motion of asymmetric triangular wave motor pattern in positive maximum process namely in rise time section, the data gathered are required THz waveforms, (negative maximum) process when scanning galvanometer gets back to initial position from positive largest motion, not image data or the data collected are abandoned.In other words, in program the position driving voltage of scanning galvanometer rise time section in keep trigger collection pattern, the data only gathered in the meantime carry out outputting to a lower part, as time-domain spectroscopy data.
Part III, considers in the quick sampling process of waveform, shortens the integral time of lock-in amplifier, can cause the increase of noise, therefore takes multiple time domain waveform to superpose.Before program is run, N number of waveform that can preset by gathering in N number of time period of asymmetric triangular wave is averaged, program realizes when the waveform number gathered is less than N, these waveforms are all stored in an array, when the waveform gathered exceeds N number of, the data that first time gathers are by deleted, and the data of N+1 group are added into, N number of Wave data is had to be averaged in total maintenance internal memory, to realize the real-time update display translation of spectroscopic data.
Part IV, the display of waveform, after multiple averaging in main interface display out, in order to see system frequency domain spectra in time, program does Fourier transform to show spectrum information in real time to the time domain waveform gathered to the time domain waveform of collection.Fig. 6 shows the interface sectional drawing of the program of the fast scanning method implementing terahertz time-domain spectroscopy system of the present invention.
One of ordinary skill in the art will appreciate that all or part of step realized in above-described embodiment method is that the hardware that can carry out instruction relevant by program has come, this program can be stored in a computer read/write memory medium, as: ROM/RAM, magnetic disc, CD etc.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (7)
1. the fast scanning method of a terahertz time-domain spectroscopy system, described terahertz time-domain spectroscopy system configuration has the scanning galvanometer of the continuous high speed motion being arranged in pumping light path, described scanning galvanometer is connected to lock-in amplifier through its driving voltage output port, photoelectricity balanced detector is connected to the signal input port of described lock-in amplifier, described lock-in amplifier is connected to control device through GPIB communication port, and described method comprises:
In response to the reading order from described control device, reading m time point in the time period, described lock-in amplifier reads the position driving voltage of described scanning galvanometer from described scanning galvanometer simultaneously and reads from the horizontal detector of described light level the differential current signal be directly proportional to terahertz signal electric field intensity, and wherein m is natural number;
The position driving voltage of each time point in the m of a reading time point and differential current signal are sent to described control device by described lock-in amplifier, as a data element;
Described m data unit buffers in the data queue be pre-created by described collecting unit by the collecting unit of described control device successively;
The processing unit of described control device extracts the data element of buffer memory from described data queue, the difference current of the differential detector in the data element of extraction is shown as the ordinate of terahertz time-domain waveform and the time domain length t that the position driving voltage of scanning galvanometer is converted into terahertz pulse in real time as the horizontal ordinate of terahertz time-domain waveform, and from data queue, delete the data element of this extraction after the treatment, wherein
Δ x is the distance of scanning galvanometer movement, and c is the light velocity.
2. fast scanning method as claimed in claim 1, wherein, described data element is two-dimensional array, and first of this two-dimensional array is classified as the position driving voltage of scanning galvanometer, the second amplitude being classified as the time domain waveform of described differential current signal.
3. fast scanning method as claimed in claim 2, wherein, described scanning galvanometer adopts asymmetric triangular wave mode of motion, and the position driving voltage that described lock-in amplifier reads described scanning galvanometer from described scanning galvanometer simultaneously and the step reading the differential current signal be directly proportional to terahertz signal electric field intensity from described photoelectricity balanced detector are specially:
In the negative maximal value of described asymmetric triangular wave to each of m time point of the rise time section of positive maximal value, described lock-in amplifier reads the position driving voltage of described scanning galvanometer from described scanning galvanometer simultaneously and reads the differential current signal be directly proportional to terahertz signal electric field intensity from described photoelectricity balanced detector.
4. fast scanning method as claimed in claim 3, wherein, in the positive maximal value of described asymmetric triangular wave to fall time of negative maximal value in section:
Described lock-in amplifier stops reading described position driving voltage and differential current signal.
5. fast scanning method as claimed in claim 3, wherein, the described reading time period comprises N number of cycle of asymmetric triangular wave, and comprise k time point in each cycle, k=m/N, k and N are natural number;
Using the difference current of the differential detector in data element as the ordinate of terahertz time-domain waveform and the position driving voltage of scanning galvanometer is carried out display in real time as the horizontal ordinate of terahertz time-domain waveform step before, described processing unit:
A) divided by N after the position driving voltage of i-th time point in the time point of the k in N number of cycle being added up, as the position driving voltage of i-th time point;
B) divided by N after the difference current of i-th time point in the time point of the k in N number of cycle being added up, as the difference current of i-th time point, wherein i=1,2,3 ..., k.
6. fast scanning method as claimed in claim 5, if the described reading time period comprises H the cycle of asymmetric triangular wave, and H is greater than N, and H is natural number, then step a) before, described processing unit is further:
Data element in the H-N of the reading cycle is rejected;
Based on from H-N+1 cycle to H cycle, perform step a) and b).
7. fast scanning method as claimed in claim 1, comprises further:
Described terahertz time-domain waveform is carried out Fourier transform, obtains the frequency-domain waveform data of THz wave, its horizontal ordinate is frequency, and ordinate is the component of difference current in each frequency, draws frequency-domain waveform curve and show according to this Wave data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410725020.5A CN104749130B (en) | 2014-12-03 | 2014-12-03 | The fast scanning method of terahertz time-domain spectroscopy system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410725020.5A CN104749130B (en) | 2014-12-03 | 2014-12-03 | The fast scanning method of terahertz time-domain spectroscopy system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104749130A true CN104749130A (en) | 2015-07-01 |
| CN104749130B CN104749130B (en) | 2017-11-03 |
Family
ID=53589138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410725020.5A Active CN104749130B (en) | 2014-12-03 | 2014-12-03 | The fast scanning method of terahertz time-domain spectroscopy system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104749130B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108303396A (en) * | 2017-12-29 | 2018-07-20 | 深圳市太赫兹科技创新研究院 | Terahertz time-domain pulse signal acquisition methods, devices and systems |
| CN108918458A (en) * | 2018-10-12 | 2018-11-30 | 北京环境特性研究所 | A kind of method of determining material Terahertz absorption peak |
| CN110108665A (en) * | 2019-05-07 | 2019-08-09 | 上海理工大学 | High speed direct picking type terahertz time-domain spectral scan method |
| CN115078299A (en) * | 2022-02-22 | 2022-09-20 | 北京工业大学 | Terahertz computed tomography three-dimensional imaging method based on galvanometer scanning system |
| US12146790B2 (en) | 2020-03-11 | 2024-11-19 | The Research Foundation For The State University Of New York | Terahertz three-dimensional spectral scanner apparatus and method of using same |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5939721A (en) * | 1996-11-06 | 1999-08-17 | Lucent Technologies Inc. | Systems and methods for processing and analyzing terahertz waveforms |
| CN1815187A (en) * | 2006-03-09 | 2006-08-09 | 首都师范大学 | THz detecting system and method for oscillating mirror rapid scanning electro-optic sampling |
| CN101871814A (en) * | 2009-04-23 | 2010-10-27 | 中国航天科工集团第二研究院二○七所 | Method for measuring pumping electrooptics of Terahertz impulse energy |
| CN201662531U (en) * | 2010-01-14 | 2010-12-01 | 首都师范大学 | Small-sized Terahertz time-domain spectrograph |
| CN102916665A (en) * | 2012-05-03 | 2013-02-06 | 首都师范大学 | Biphase digital phase-locking amplifier and digital domain synchronous phase-locking algorithm thereof |
-
2014
- 2014-12-03 CN CN201410725020.5A patent/CN104749130B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5939721A (en) * | 1996-11-06 | 1999-08-17 | Lucent Technologies Inc. | Systems and methods for processing and analyzing terahertz waveforms |
| CN1815187A (en) * | 2006-03-09 | 2006-08-09 | 首都师范大学 | THz detecting system and method for oscillating mirror rapid scanning electro-optic sampling |
| CN101871814A (en) * | 2009-04-23 | 2010-10-27 | 中国航天科工集团第二研究院二○七所 | Method for measuring pumping electrooptics of Terahertz impulse energy |
| CN201662531U (en) * | 2010-01-14 | 2010-12-01 | 首都师范大学 | Small-sized Terahertz time-domain spectrograph |
| CN102916665A (en) * | 2012-05-03 | 2013-02-06 | 首都师范大学 | Biphase digital phase-locking amplifier and digital domain synchronous phase-locking algorithm thereof |
Non-Patent Citations (2)
| Title |
|---|
| 蒋鹏: "THz-TDS测控系统研究", 《中国优秀硕士学位论文全文数据库 基础科学辑》 * |
| 袁静: "太赫兹时域光谱系统的运动控制和数据采集", 《中国优秀硕士学位论文全文数据库 基础科学辑》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108303396A (en) * | 2017-12-29 | 2018-07-20 | 深圳市太赫兹科技创新研究院 | Terahertz time-domain pulse signal acquisition methods, devices and systems |
| CN108918458A (en) * | 2018-10-12 | 2018-11-30 | 北京环境特性研究所 | A kind of method of determining material Terahertz absorption peak |
| CN108918458B (en) * | 2018-10-12 | 2020-12-04 | 北京环境特性研究所 | Method for determining terahertz absorption peak of material |
| CN110108665A (en) * | 2019-05-07 | 2019-08-09 | 上海理工大学 | High speed direct picking type terahertz time-domain spectral scan method |
| US12146790B2 (en) | 2020-03-11 | 2024-11-19 | The Research Foundation For The State University Of New York | Terahertz three-dimensional spectral scanner apparatus and method of using same |
| CN115078299A (en) * | 2022-02-22 | 2022-09-20 | 北京工业大学 | Terahertz computed tomography three-dimensional imaging method based on galvanometer scanning system |
| CN115078299B (en) * | 2022-02-22 | 2024-05-31 | 北京工业大学 | Terahertz computed tomography three-dimensional imaging method based on galvanometer scanning system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104749130B (en) | 2017-11-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104749130A (en) | Quick scanning method of terahertz time-domain spectroscopic system | |
| CN102262190B (en) | Device and method for online discharge monitoring of ultrahigh voltage power transmission line | |
| CN203299112U (en) | Agricultural product quality multi-spectral imaging and detecting device | |
| CN102565546A (en) | Electromagnetic radiation scanning and positioning method | |
| CN103646090A (en) | Application program recommendation method and optimization method and device for program starting speeds | |
| CN104217112B (en) | A kind of low-frequency oscillation analysis method for power system based on polymorphic type signal | |
| CN104501954A (en) | Spectral characteristic tester based on synchronous pulse measurement technique | |
| CN104880509B (en) | Multi-layered conductive structure defect detecting device and its method based on impulse eddy current | |
| CN109507709A (en) | Core pulse signal processing method and processing device | |
| CN108303396A (en) | Terahertz time-domain pulse signal acquisition methods, devices and systems | |
| CN104808057B (en) | A kind of acousto-optic real-time signal analyzer based on asynchronous detection | |
| CN204903384U (en) | Rock core formation of image spectrum scanner | |
| CN205749675U (en) | Harmonic detection test platform | |
| CN204214770U (en) | Based on the multichannel light optical fiber spectrograph of cmos image sensor | |
| CN105572485B (en) | A kind of compound display methods of spectrum space | |
| CN110108665A (en) | High speed direct picking type terahertz time-domain spectral scan method | |
| CN204128960U (en) | A kind of drinks quality sense organ classification quick analytic instrument | |
| CN105352555A (en) | Portable detection device for quickly identifying storage time of fowl eggs, and application method thereof | |
| CN107202993A (en) | The big visual field laser three-dimensional imaging system of cascade acousto-optic sampled based on Full wave shape | |
| CN204575874U (en) | Instrument is searched in visual string distortion | |
| CN107255625B (en) | Tea production place identification device based on embedded type and application thereof | |
| CN107782531A (en) | A kind of line array CCD spectral resolution detecting system | |
| CN103336458B (en) | Multi-thread data acquisition system synchronization control method in acquisition time control mode | |
| CN102297848B (en) | Terahertz pulse rapid imaging method | |
| CN103308083B (en) | A kind of Brillouin spectrum recognition methods based on energy distribution |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |