CN109000793B - A kind of terahertz time-domain spectroscopy data collection system - Google Patents
A kind of terahertz time-domain spectroscopy data collection system Download PDFInfo
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- CN109000793B CN109000793B CN201810581358.6A CN201810581358A CN109000793B CN 109000793 B CN109000793 B CN 109000793B CN 201810581358 A CN201810581358 A CN 201810581358A CN 109000793 B CN109000793 B CN 109000793B
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- 238000001328 terahertz time-domain spectroscopy Methods 0.000 title claims abstract description 30
- 238000013480 data collection Methods 0.000 title claims abstract description 23
- 238000001914 filtration Methods 0.000 claims abstract description 12
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 16
- 230000003321 amplification Effects 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 230000005693 optoelectronics Effects 0.000 claims description 4
- 230000009977 dual effect Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 230000003111 delayed effect Effects 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000004611 spectroscopical analysis Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002059 diagnostic imaging Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/12—Generating the spectrum; Monochromators
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J2003/283—Investigating the spectrum computer-interfaced
- G01J2003/2833—Investigating the spectrum computer-interfaced and memorised spectra collection
Abstract
The embodiment of the present invention provides a kind of terahertz time-domain spectroscopy data collection system, comprising: sequentially connected lock-in amplifier, preamplifier, active filter, droop amplifier, analog-digital converter and digital analog converter；Lock-in amplifier, the low current signal generated for amplifying photoconductive receiving antenna, exports the first weak voltage signal；Preamplifier amplifies the first weak voltage signal to obtain the second weak voltage signal for compensating the amplifying power of lock-in amplifier；Active filter obtains the weak voltage signal of third for amplifying after carrying out low-pass filtering to the second weak voltage signal；Droop amplifier, for the weak voltage signal of third to be converted to the 4th weak voltage signal；Analog-digital converter, for acquiring the 4th weak voltage signal and being converted to digital voltage signal；Digital analog converter, for digital voltage signal to be converted to analog voltage signal.The present invention realizes the acquisition of terahertz time-domain spectroscopy data using the design of veneer, has practicability.
Description
Technical field
The present invention relates to Terahertz Technology field more particularly to a kind of terahertz time-domain spectroscopy data collection systems.
Background technique
In past 30 years, continues to bring out along with various new materials, new technology, provided newly for terahertz emission
Higher power emission source, Terahertz Technology has occurred that revolutionary variation.Terahertz Technology has been proved in life
The various fields such as object medical imaging, safety inspection, broadband connections and radar have wide scientific research value and application prospect.
The research of generation and detection about THz wave is still in infancy.By the effort Terahertz of recent two decades
The generation of wave and detection technique have been mature on the whole, and there are many commercialized products.The pulse terahertz time-domain of mainstream at present
Spectrometer generates pulse Terahertz using photoconductive method, and detects then using photoconduction or Electro-optic sampling.Based on too
The current situation of hertz time-domain spectroscopy system needs the circuit system for developing a set of mature quickly analog-to-digital conversion, and then acquires
To the terahertz time-domain spectroscopy pulse signal of complete and accurate.
Existing terahertz time-domain spectroscopy acquisition system uses commercial instrument, to cause bulky, is unfavorable for system
Integrated, resource utilization is not high.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of terahertz time-domain spectroscopy data collection systems, using veneer
Design realize terahertz time-domain spectroscopy data acquisition, have it is small-sized, quickly, the characteristics of being easily integrated.
The first aspect of the embodiment of the present invention provides a kind of terahertz time-domain spectroscopy data collection system, including successively connects
Lock-in amplifier, preamplifier, active filter, droop amplifier, analog-digital converter and the digital analog converter connect；
The lock-in amplifier, the low current signal generated for amplifying photoconductive receiving antenna, exports the first light current
Press signal；
The preamplifier, for compensating the amplifying power of the lock-in amplifier, to the described first weak voltage signal
It amplifies to obtain the second weak voltage signal；
It is weak to obtain third for amplifying after carrying out low-pass filtering to the second weak voltage signal for the active filter
Voltage signal；
The droop amplifier, for the weak voltage signal of the third to be converted to the 4th weak voltage signal；
The analog-digital converter, for acquiring the 4th weak voltage signal and being converted to digital voltage signal；
The digital analog converter, for the digital voltage signal to be converted to analog voltage signal.
Based in a first aspect, in the first possible implementation, the lock-in amplifier comes from photoelectricity for receiving
The weak current I of lead antenna, exporting first light current and pressing V=IR, R is the lock-in amplifier across resistance.
Based in a first aspect, in the second possible implementation, the preamplifier uses single supply or double electricity
Source power supply, keeps signal integrity while capable of driving unlimited large capacitive load.
Based in a first aspect, in the third possible implementation, the active filter is filtered by KRC step low-pass
Wave circuit realizes low-pass filtering and voltage amplification function.
Based in a first aspect, in the fourth possible implementation, the droop amplifier provides 0.4 times and 0.8 times
Attenuation coefficient, and can to common mode electrical level convert and single-ended signal to differential signal conversion.
Based in a first aspect, in a fifth possible implementation, the analog-digital converter be fully differential 18 gradually
Type analog-to-digital converter is approached, signal-to-noise ratio is 98dB when reference voltage source is 4.096V.
Based in a first aspect, in a sixth possible implementation, the digital analog converter uses schmidt trigger formula
External reference voltage, 16 analog-digital converters of single channel, for completing digital-to-analogue conversion, to delay are taken in input, single supply power supply
Control system provides input signal.
Based in a first aspect, in the 7th kind of possible implementation, the terahertz time-domain spectroscopy data collection system
Further include:
Controller is processed and displayed for the collected digital voltage signal to be transmitted to computer.
The 7th kind of possible implementation based on first aspect, in the 8th kind of possible implementation, the terahertz
Hereby time-domain spectroscopy data collection system further include:
With the optoelectronic switch of controller communication connection, laser access or open circuit are realized for passing through control voltage,
With opening or closing for corresponding control laser.
Based in a first aspect, the digital analog converter is also used to control closed loop and prolongs in the 9th kind of possible implementation
When system.
Existing beneficial effect is the embodiment of the present invention compared with prior art: the terahertz time-domain in the embodiment of the present invention
Spectrum data gathering system, comprising: sequentially connected lock-in amplifier, preamplifier, active filter, droop amplifier,
Analog-digital converter and digital analog converter；The lock-in amplifier, the weak current letter generated for amplifying photoconductive receiving antenna
Number, export the first weak voltage signal；The preamplifier, for compensating the amplifying power of the lock-in amplifier, to described
First weak voltage signal amplifies to obtain the second weak voltage signal；The active filter, for the second weak voltage signal
It is amplified after carrying out low-pass filtering, obtains the weak voltage signal of third；The droop amplifier is used for the third light current pressure
Signal is converted to the 4th weak voltage signal；The analog-digital converter, for acquiring the 4th weak voltage signal and being converted to number
Word voltage signal；The digital analog converter, for the digital voltage signal to be converted to analog voltage signal.The present invention is implemented
Example realizes the acquisition of terahertz time-domain spectroscopy data using the design of veneer, has small-sized, quickly, the characteristics of being easily integrated, has
Stronger usability and practicality.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some
Embodiment for those of ordinary skill in the art without any creative labor, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is the schematic diagram for the terahertz time-domain spectroscopy data collection system that the embodiment of the present invention one provides；
Fig. 2 is terahertz time-domain spectroscopy signal acquisition waveform diagram provided in an embodiment of the present invention；
Fig. 3 is the schematic diagram of terahertz time-domain spectroscopy data collection system provided by Embodiment 2 of the present invention.
Specific embodiment
In being described below, for illustration and not for limitation, the tool of such as particular system structure, technology etc is proposed
Body details, to understand thoroughly the embodiment of the present invention.However, it will be clear to one skilled in the art that there is no these specific
The present invention also may be implemented in the other embodiments of details.In other situations, it omits to well-known system, device, electricity
The detailed description of road and method, in case unnecessary details interferes description of the invention.
It should be noted that term " includes " and their any changes in description and claims of this specification
Shape, it is intended that cover and non-exclusive include.Such as process, method comprising a series of steps or units or system, product or
Equipment is not limited to listed step or unit, but optionally further comprising the step of not listing or unit or optional
Ground further includes the other step or units intrinsic for these process, methods, product or equipment.In addition, term " first ", " the
Two " and " third " etc. are for distinguishing different objects, not for description particular order.
In order to make the invention's purpose, features and advantages of the invention more obvious and easy to understand, below in conjunction with the present invention
Attached drawing in embodiment, technical solution in the embodiment of the present invention are described, it is clear that the embodiments described below are only
It is a part of the embodiment of the present invention, and not all embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art
All other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Embodiment one
The embodiment of the present invention provides a kind of terahertz time-domain spectroscopy data collection system, as shown in Figure 1, terahertz time-domain light
Modal data acquisition system includes:
Sequentially connected lock-in amplifier 11, preamplifier 12, active filter 13, droop amplifier 14, modulus turn
Parallel operation 15 and digital analog converter 16；
In embodiments of the present invention, lock-in amplifier 11, the weak current letter generated for amplifying photoconductive receiving antenna
Number, export the first weak voltage signal；
Preamplifier 12, for compensating the amplifying power of the lock-in amplifier, to the described first weak voltage signal into
Row amplification obtains the second weak voltage signal；
Active filter 13 obtains third light current for amplifying after carrying out low-pass filtering to the second weak voltage signal
Press signal；
Droop amplifier 14, for the weak voltage signal of the third to be converted to the 4th weak voltage signal；
Analog-digital converter 15, for acquiring the 4th weak voltage signal and being converted to digital voltage signal；
Digital analog converter 16, for the digital voltage signal to be converted to analog voltage signal.
Specifically, lock-in amplifier 11 is used to amplify the low current signal of photoconductive antenna generation；Pre-amplification circuit
12 connect with the output signal of lock-in amplifier 11, for compensating the amplifying power of lock-in amplifier 11；Active filter 13 with
The output signal of pre-amplification circuit 12 connects, and is used for low-pass filtering and voltage amplification；Droop amplifier 14 and active filter
13 output signal connects, and converts for accurate common mode electrical level and single-ended to differential conversion；Analog-digital converter 15 and decaying are put
Big device 14 connects, for acquiring amplified voltage signal；Digital analog converter 16 and analog-digital converter 15 connect, and being used for will be described
Digital voltage signal is converted to analog voltage signal.
Specifically, lock-in amplifier 11 connects with photoconductive antenna, and the low current signal come out from photoconductive antenna is logical
It crosses lock-in amplifier 6 and becomes weak voltage signal (the first weak voltage signal) later, then preamplifier 12 is to the first light current pressure
Signal is further compensate for amplification and obtains the second weak voltage signal, enters active low-pass filter 13 later and is filtered to obtain third
Weak voltage signal, Fig. 2 shows terahertz time-domain spectroscopy signal acquisition waveform diagrams.In order to turn the modulus that enters of signal full scale
Parallel operation improves precision, and the signal being filtered is introduced into droop amplifier 14, and voltage signal decaying is inputted full scale at A/D chip
Voltage range, and single-ended signal is changed into differential signal and obtains the 4th weak voltage signal, analog-digital converter 15 believes analog voltage
Number (the 4th weak voltage signal) is converted into digital voltage signal, this process is controlled by controller (being not shown in Fig. 1) and completed.Control
Device output digit signals processed generate analog signal, send to delay control system to digital analog converter 16, for pumping to Terahertz
Light provides controllable delay.
In one embodiment, the lock-in amplifier exports institute for receiving the weak current I from photoconductive antenna
Stating the first light current pressure V=IR, R is the lock-in amplifier across resistance.
In one embodiment, the preamplifier uses single supply or dual power supply, can drive infinitely great appearance
Property load while keep signal integrity.Wherein, preamplifier be a low cost, low-power consumption, high-speed computation amplification
Device has High Output Current driving capability using single supply or dual power supply, therefore can drive the same of unlimited large capacitive load
When keep signal integrity.
In one embodiment, the active filter realized by KRC second-order low-pass filter circuit low-pass filtering and
Voltage amplification function.This filter circuit has extremely low offset voltage, low input bias current, low noise, has input over-voltage
Defencive function, overload restore function.
In one embodiment, the droop amplifier provides 0.4 times and 0.8 times of attenuation coefficient, and can be to altogether
Mould level conversion and single-ended signal to differential signal conversion.
In one embodiment, the analog-digital converter is 18 gradual approaching A/D converters of fully differential, works as benchmark
Signal-to-noise ratio is 98dB when voltage source is 4.096V.
In one embodiment, the digital analog converter is inputted using schmidt trigger formula, and outside is taken in single supply power supply
Reference voltage, 16 analog-digital converters of single channel provide input signal to delay control system for completing digital-to-analogue conversion.
It can be seen that terahertz time-domain spectroscopy data collection system in embodiments of the present invention, comprising: sequentially connected
Lock-in amplifier, preamplifier, active filter, droop amplifier, analog-digital converter and digital analog converter；The locking phase is put
Big device, the low current signal generated for amplifying photoconductive receiving antenna, exports the first weak voltage signal；The preposition amplification
Device amplifies to obtain the second light current for compensating the amplifying power of the lock-in amplifier to the described first weak voltage signal
Press signal；The active filter obtains third light current for amplifying after carrying out low-pass filtering to the second weak voltage signal
Press signal；The droop amplifier, for the weak voltage signal of the third to be converted to the 4th weak voltage signal；The modulus turns
Parallel operation, for acquiring the 4th weak voltage signal and being converted to digital voltage signal；The digital analog converter, being used for will be described
Digital voltage signal is converted to analog voltage signal.The embodiment of the present invention realizes terahertz time-domain spectroscopy number using the design of veneer
According to acquisition, have small-sized, quickly, the characteristics of being easily integrated, there is stronger usability and practicality.
Embodiment two
The embodiment of the present invention provides a kind of terahertz time-domain spectroscopy data collection system.As shown in figure 3, terahertz time-domain light
Modal data acquisition system includes:
Sequentially connected lock-in amplifier 11, preamplifier 12, active filter 13, droop amplifier 14, modulus turn
Parallel operation 15, digital analog converter 16, controller 17, computer 18, optoelectronic switch 19 and delay control system 20.
In embodiments of the present invention, lock-in amplifier 11, the weak current letter generated for amplifying photoconductive receiving antenna
Number, export the first weak voltage signal；
Preamplifier 12, for compensating the amplifying power of the lock-in amplifier, to the described first weak voltage signal into
Row amplification obtains the second weak voltage signal；
Active filter 13 obtains third light current for amplifying after carrying out low-pass filtering to the second weak voltage signal
Press signal；
Droop amplifier 14, for the weak voltage signal of the third to be converted to the 4th weak voltage signal；
Analog-digital converter 15, for acquiring the 4th weak voltage signal and being converted to digital voltage signal；
Digital analog converter 16, for the digital voltage signal to be converted to analog voltage signal.
Specifically, lock-in amplifier 11 connects with photoconductive antenna, and lock-in amplifier 11 is for amplifying photoconductive antenna production
Raw low current signal；Pre-amplification circuit 12 connects with the output signal of lock-in amplifier 11, for compensating locking phase amplification
The amplification energy of device 11；Active filter 13 connects with the output signal of pre-amplification circuit 12, puts for low-pass filtering and voltage
Greatly；The output signal of droop amplifier 14 and active filter 13 connects, and converts for accurate common mode electrical level and single-ended to poor
Divide conversion；Analog-digital converter 15 and droop amplifier 14 connect, for acquiring amplified voltage signal；16 He of digital analog converter
Analog-digital converter 15 connects, for the digital voltage signal to be converted to analog voltage signal.Controller 17 is used for modulus
The collected digital voltage signal of converter 15 is transmitted to computer 18 and is processed and displayed.Digital analog converter 16 and laser
(being not shown in Fig. 3) connects, and analog signal is exported, for controlling closed loop delayed time system 20.Optoelectronic switch 19 and the (figure of controller 17
Be not shown in 3) connect, for realizing laser access or open circuit by control voltage, with the unlatching of corresponding control laser or
It closes.
Embodiment described above is merely illustrative of the technical solution of the present invention, rather than its limitations；Although referring to aforementioned reality
Applying example, invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each
Technical solution documented by embodiment is modified or equivalent replacement of some of the technical features；And these are modified
Or replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution should all
It is included within protection scope of the present invention.
Claims (10)
1. a kind of terahertz time-domain spectroscopy data collection system, which is characterized in that including sequentially connected lock-in amplifier, preposition
Amplifier, active filter, droop amplifier, analog-digital converter and digital analog converter；
The lock-in amplifier, the low current signal generated for amplifying photoconductive receiving antenna, output the first light current pressure letter
Number；
The preamplifier carries out the described first weak voltage signal for compensating the amplifying power of the lock-in amplifier
Amplification obtains the second weak voltage signal；
The active filter obtains third light current pressure for amplifying after carrying out low-pass filtering to the second weak voltage signal
Signal；
The droop amplifier, for the weak voltage signal of the third to be converted to the 4th weak voltage signal；
The analog-digital converter, for acquiring the 4th weak voltage signal and being converted to digital voltage signal；
The digital analog converter, for the digital voltage signal to be converted to analog voltage signal.
2. terahertz time-domain spectroscopy data collection system as described in claim 1, which is characterized in that the lock-in amplifier
For receiving the weak current I from photoconductive antenna, exporting first light current and pressing V=IR, R is the lock-in amplifier
Across resistance.
3. terahertz time-domain spectroscopy data collection system as described in claim 1, which is characterized in that the preamplifier
Using single supply or dual power supply, signal integrity is kept while unlimited large capacitive load can be driven.
4. terahertz time-domain spectroscopy data collection system as described in claim 1, which is characterized in that
The active filter realizes low-pass filtering and voltage amplification function by KRC second-order low-pass filter circuit.
5. terahertz time-domain spectroscopy data collection system as described in claim 1, which is characterized in that the droop amplifier mentions
For 0.4 times and 0.8 times of attenuation coefficient, and can to common mode electrical level convert and single-ended signal to differential signal conversion.
6. terahertz time-domain spectroscopy data collection system as described in claim 1, which is characterized in that the analog-digital converter is
18 gradual approaching A/D converters of fully differential, when reference voltage source is 4.096V, signal-to-noise ratio is 98dB.
7. terahertz time-domain spectroscopy data collection system as described in claim 1, which is characterized in that the digital analog converter is adopted
It is inputted with schmidt trigger formula, external reference voltage, 16 analog-digital converters of single channel, for completing are taken in single supply power supply
Digital-to-analogue conversion provides input signal to delay control system.
8. terahertz time-domain spectroscopy data collection system as described in claim 1, which is characterized in that further include:
Controller is processed and displayed for the collected digital voltage signal to be transmitted to computer.
9. terahertz time-domain spectroscopy data collection system as claimed in claim 8, which is characterized in that further include:
With the optoelectronic switch of controller communication connection, laser access or open circuit are realized for passing through control voltage, with right
Opening or closing for laser should be controlled.
10. terahertz time-domain spectroscopy data collection system as described in claim 1, which is characterized in that the digital analog converter
It is also used to control closed loop delayed time system.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810581358.6A CN109000793B (en) | 2018-06-07 | 2018-06-07 | A kind of terahertz time-domain spectroscopy data collection system |
| PCT/CN2018/114430 WO2019233033A1 (en) | 2018-06-07 | 2018-11-07 | Terahertz time domain spectrum data acquisition system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810581358.6A CN109000793B (en) | 2018-06-07 | 2018-06-07 | A kind of terahertz time-domain spectroscopy data collection system |
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| CN109000793A CN109000793A (en) | 2018-12-14 |
| CN109000793B true CN109000793B (en) | 2019-08-13 |
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| WO (1) | WO2019233033A1 (en) |
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| CN112510352A (en) * | 2020-11-04 | 2021-03-16 | 西南科技大学 | Terahertz wave radiation method and system of microstructure photoconductive antenna |
| CN114900234B (en) * | 2022-07-14 | 2022-10-21 | 四川太赫兹通信有限公司 | Terahertz frequency spectrum environment map construction method and equipment |
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| CN101964633A (en) * | 2010-10-22 | 2011-02-02 | 天津大学 | Lock-in amplifier circuit for detecting terahertz pulse signals |
| CN103389161A (en) * | 2013-07-30 | 2013-11-13 | 东莞理工学院 | Method and phase locking amplifier device for detecting terahertz weak signal |
| CN104833650A (en) * | 2015-05-29 | 2015-08-12 | 南开大学 | Pulse terahertz time-domain spectral system with single photoconductive antenna and detection method thereof |
| WO2016053049A1 (en) * | 2014-10-02 | 2016-04-07 | 광주과학기술원 | Device for generating and detecting photo mixing-type continuous-wave terahertz using phase noise compensation method |
| CN107144545A (en) * | 2017-06-09 | 2017-09-08 | 深圳市太赫兹科技创新研究院 | All -fiber formula terahertz time-domain spectroscopy instrument |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201830211U (en) * | 2010-10-22 | 2011-05-11 | 天津大学 | Lock-in amplifying circuit adopting CD552-R3 chip |
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2018
- 2018-06-07 CN CN201810581358.6A patent/CN109000793B/en active Active
- 2018-11-07 WO PCT/CN2018/114430 patent/WO2019233033A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101964633A (en) * | 2010-10-22 | 2011-02-02 | 天津大学 | Lock-in amplifier circuit for detecting terahertz pulse signals |
| CN103389161A (en) * | 2013-07-30 | 2013-11-13 | 东莞理工学院 | Method and phase locking amplifier device for detecting terahertz weak signal |
| WO2016053049A1 (en) * | 2014-10-02 | 2016-04-07 | 광주과학기술원 | Device for generating and detecting photo mixing-type continuous-wave terahertz using phase noise compensation method |
| CN104833650A (en) * | 2015-05-29 | 2015-08-12 | 南开大学 | Pulse terahertz time-domain spectral system with single photoconductive antenna and detection method thereof |
| CN107144545A (en) * | 2017-06-09 | 2017-09-08 | 深圳市太赫兹科技创新研究院 | All -fiber formula terahertz time-domain spectroscopy instrument |
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|---|---|
| CN109000793A (en) | 2018-12-14 |
| WO2019233033A1 (en) | 2019-12-12 |
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