CN207850915U - A kind of system based on the double detections of Terahertz - Google Patents
A kind of system based on the double detections of Terahertz Download PDFInfo
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- CN207850915U CN207850915U CN201820184110.1U CN201820184110U CN207850915U CN 207850915 U CN207850915 U CN 207850915U CN 201820184110 U CN201820184110 U CN 201820184110U CN 207850915 U CN207850915 U CN 207850915U
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- terahertz
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Abstract
The utility model discloses a kind of systems based on the double detections of Terahertz, including：Optical filter, photomultiplier, computer, mode switch module, the first terahertz reflector, the first lens, zinc telluridse crystal, quarter wave plate, prism, balanced detector, lock-in amplifier；The mode switch module is connected by one end of optical filter and photomultiplier, and the other end of the photomultiplier is connect with computer；The mode switch module is also connect by the first terahertz reflector with the first lens, the focal point of first lens is provided with zinc telluridse crystal, the zinc telluridse crystal is connected by quarter wave plate with prism, one end of the prism and balanced detector connects, and the other end of the balanced detector is connect by lock-in amplifier with computer.The double detection systems of Terahertz that this programme provides, integrated height more economical compared to existing single system can meet the needs of more testing, are widely used in field of detecting with the optimal detection mode of unrestricted choice.
Description
Technical field
The utility model is related to field of detecting, the specially double detection systems of Terahertz.
Background technology
THz wave is located at infrared between microwave, has low photon energy, high penetrability, high bandwidth and high
The special natures such as time and space coherence are a frequency ranges for having very much researching value but being not yet fully developed,
Using covering scientific research, Industrial quality control, national security, environmental monitoring and medical diagnosis and treatment, Terahertz section
Skill is a very important forward position crossing domain, and one is provided newly to scientific and technical innovation, the national economic development and national security
Opportunity.
The critical issue of the development of Terahertz science and technology is THz source and Terahertz detection technique.Wherein Terahertz
Detection is divided into coherent detection and non-coherent detection, and non-coherent detection technology is normally based on photo-thermal effect and photon effect, due to
Non-coherent detection can not detect THz wave intensity and phase therefore coherent detection method it is extremely heavy in research and application
It wants, coherent detection is broadly divided into photoconductive antenna sampling, free space electro-optic sampling, is based on gas plasma detection of gas side
Method.
Photoconductive sampling technique has the shortcomings that photo-generated carrier service life, mobility, breakdown electric field, antenna structure；Electric light
Sampling technique overcomes the limitation in photo-generated carrier service life in photoconductive sampling technique, has faster response speed, higher
Sensitivity and resolution ratio, signal-to-noise ratio higher, and since electro-optic crystal technology of preparing is quite ripe.But electro optic sampling technology by
Limit is limited with the intrinsic phonon absorption of electro-optic crystal, and in the case of wider terahertz emission, the spectrum width that different crystal detects is different,
It is general relatively narrow, and when Terahertz is very strong, the Terahertz detected using this method can deform；For gas plasma gas
Detection method, can detect the bandwidth of ultra-wide, superpower field, super superior sensitivity of detection (heterodyne method) and superelevation
Frequency resolution.But the disadvantage is that：Probe portion apply spacing be several millimeters, the HVB high voltage bias system of nearly 3kv/cm, increase
Adding system adjusts difficulty, and signal-to-noise ratio does not have electro optic sampling technology high.
For the prior art in detecting Terahertz, above two method has certain limitation.To sum up, the technology it is necessary to
It is improved.
Utility model content
In order to solve the above-mentioned technical problem, the purpose of this utility model is to provide a kind of double detection systems of Terahertz.
Technical solution used by the utility model is：
The utility model provides a kind of system based on the double detections of Terahertz, including：Optical filter, photomultiplier, computer,
Mode switch module, the first terahertz reflector, the first lens, zinc telluridse crystal, quarter wave plate, prism, balanced detector, lock
Phase amplifier；The mode switch module by one end of optical filter and photomultiplier connect, the photomultiplier it is another
One end is connect with computer；The mode switch module is also connect by the first terahertz reflector with the first lens, described
The focal point of one lens is provided with zinc telluridse crystal, and the zinc telluridse crystal is connected by quarter wave plate with prism, the prism
It is connect with one end of balanced detector, the other end of the balanced detector is connect by lock-in amplifier with computer；
Wherein, the mode switch module include the second lens, the bias voltage circuit that is arranged at the second lens focus,
The second terahertz reflector being connect with the bias voltage circuit；Wherein the first terahertz reflector, the reflection of the second Terahertz
Mirror it is parallel to each other and with ground at 45 degree.
As the improvement of the technical solution, 800nm light passes through the biasing of the focal point positioned at the second lens with THz wave
Laser second harmonic is generated after potential circuit effect.
As the improvement of the technical solution, the mode switch module is adjustable apparatus, is turned by adjusting implementation pattern
It changes.
As the improvement of the technical solution, the mode switch module is located on the aluminium sheet of removable gear.
Further, the prism will detect light and be divided into mutually perpendicular two components and be incident in balanced detector.
Further, the prism is to hold Lars prism.
Further, the thickness of the zinc telluridse crystal is 1mm.
Further, the model SR830 of the lock-in amplifier.
The utility model has the beneficial effects that：The double detection systems of Terahertz provided by the utility model, by electro optic sampling skill
Art selects zinc telluridse (ZnTe) with gaseous plasma Detection Techniques set to one, electro-optic crystal, can two kinds of spies of free switching
Survey pattern provides multiple choices mode, flexibly uses, and over ride any one single detection system, not only saved at
This, and system compact, integrability, convenient for commercialization.It can meet more people's demands, enhance the flexibility of test.
Description of the drawings
Specific embodiment of the present utility model is described further below in conjunction with the accompanying drawings：
Fig. 1 is the schematic diagram of one embodiment of the utility model.
Specific implementation mode
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.
Referring to Fig.1, the utility model provides a kind of system based on the double detections of Terahertz, including：Optical filter, photomultiplier transit
Pipe, computer, mode switch module, the first terahertz reflector, the first lens, zinc telluridse crystal, quarter wave plate, prism, balance are visited
Survey device, lock-in amplifier；The mode switch module is connected by one end of optical filter and photomultiplier, the photomultiplier transit
The other end of pipe is connect with computer；The mode switch module is also connect by the first terahertz reflector with the first lens,
The focal point of first lens is provided with zinc telluridse crystal, and the zinc telluridse crystal is connected by quarter wave plate with prism, institute
The one end for stating prism and balanced detector connects, and the other end of the balanced detector is connect by lock-in amplifier with computer；
Wherein, the mode switch module include the second lens, the bias voltage circuit that is arranged at the second lens focus,
The second terahertz reflector being connect with the bias voltage circuit；Wherein the first terahertz reflector, the reflection of the second Terahertz
Mirror it is parallel to each other and with ground at 45 degree.
As the improvement of the technical solution, 800nm light passes through the biasing of the focal point positioned at the second lens with THz wave
Laser second harmonic is generated after potential circuit effect.
As the improvement of the technical solution, the mode switch module is adjustable apparatus, is turned by adjusting implementation pattern
It changes.Such as it can be a baffle or screening arrangement, and when it selects wherein pattern, then light is by the mode switch module,
When it switches another pattern, operable adjustable apparatus so that light reaches both of which without the mode switch module
Free switching.
As the improvement of the technical solution, the mode switch module is located on the aluminium sheet of removable gear.
Further, terahertz light with detection light simultaneously by zinc telluridse crystal, quarter wave plate and after holding Lars prism,
Become the unequal S light of light intensity and P light.
Further, the prism will detect light and be divided into mutually perpendicular two components and be incident in balanced detector.
Further, the prism is to hold Lars prism.
Further, the thickness of the zinc telluridse crystal is 1mm.
Further, the model SR830 of the lock-in amplifier.
As a specific embodiment, this programme is by the second lens, bias voltage circuit, the second terahertz reflector (pattern
Handover module) be placed on can be on the aluminium sheet of upper and lower two gears movement.
When aluminium sheet is in upper gear, laser is in the second lens and the second terahertz reflector height center position；Too
When the light of hertz and 800nm pass through the part, plasma is generated by the second lens focus to air, and apply in focal point
The alternately HVB high voltage bias of variation, under bias voltage effect, 800nm laser will generate laser second harmonic with terahertz light.Again
The laser of 800nm is filtered by optical filter；Then the strength signal of second harmonic is detected using photomultiplier.Most
It is acquired afterwards by computer software.
When aluminium sheet is in the next gear, Terahertz and laser pass freely through above the part, anti-by the first Terahertz
After penetrating mirror, by the first lens focus to ZnTe crystal (thickness 1mm), and Terahertz electric field and light polarization are parallel to
[110] it is orientated on ZnTe crystal, when the light pulse of linear polarization and terahertz pulse are propagated in ZnTe crystal, field causes birefringence meeting
Make the index ellipsoid of direct impulse that small variation occur, terahertz light passes through zinc telluridse crystal, 1/4 wave simultaneously with detection light
Piece and after holding Lars prism, becomes the unequal S light of light intensity and P light.Lars prism (Wollaston) is wherein held detection
Light is divided into mutually perpendicular two components and is incident in balanced detector.Balanced detector measures two vertical components of direct impulse
Intensity difference.Signal is amplified by lock-in amplifier (model SR830), terahertz signal is read by computer software.
The double detection systems of Terahertz that this programme provides, however it is not limited to this form, wherein by another mode setting in aluminium sheet
It is first-class, belong to the protection domain of this programme.More economical compared to existing single system, integrated height, this programme can be free
Optimal detection mode is selected, meets the needs of more testing.
The double detection systems of Terahertz provided by the utility model, by electro optic sampling technology and gaseous plasma Detection Techniques
Gather one, electro-optic crystal selects zinc telluridse (ZnTe), can two kinds of detection modes of free switching, multiple choices mode is provided,
It flexibly uses, and over ride any one single detection system, has not only saved cost, and system compact, integrability, just
In commercialization.It can meet more people's demands, enhance the flexibility of test.
It is to be illustrated to the preferable implementation of the utility model, but the invention is not limited to the reality above
Example is applied, those skilled in the art can also make various equivalent changes without departing from the spirit of the present invention
Shape or replacement, these equivalent deformations or replacement are all contained in the application claim limited range.
Claims (8)
1. a kind of system based on the double detections of Terahertz, which is characterized in that including：Optical filter, photomultiplier, computer, pattern
Handover module, the first terahertz reflector, the first lens, zinc telluridse crystal, quarter wave plate, prism, balanced detector, locking phase are put
Big device；The mode switch module is connected by one end of optical filter and photomultiplier, the other end of the photomultiplier
It is connect with computer；The mode switch module is also connect by the first terahertz reflector with the first lens, thoroughly described first
The focal point of mirror is provided with zinc telluridse crystal, and the zinc telluridse crystal is connected by quarter wave plate with prism, the prism with it is flat
One end connection of weighing apparatus detector, the other end of the balanced detector are connect by lock-in amplifier with computer；
Wherein, the mode switch module include the second lens, the bias voltage circuit that is arranged at the second lens focus and institute
State the second terahertz reflector of bias voltage circuit connection；Wherein the first terahertz reflector, the second terahertz reflector are mutual
It is parallel and with ground at 45 degree.
2. the system according to claim 1 based on the double detections of Terahertz, it is characterised in that：800nm light and THz wave
Laser second harmonic is generated after the effect of the bias voltage circuit of the focal point positioned at the second lens.
3. the system according to claim 1 based on the double detections of Terahertz, it is characterised in that：The mode switch module is
Adjustable apparatus, by adjusting implementation pattern conversion.
4. the system according to claim 1 based on the double detections of Terahertz, it is characterised in that：The mode switch module position
In on the aluminium sheet of removable gear.
5. the system according to any one of claims 1 to 4 based on the double detections of Terahertz, it is characterised in that：The prism
Detection light is divided into mutually perpendicular two components and is incident in balanced detector.
6. the system according to claim 5 based on the double detections of Terahertz, it is characterised in that：The prism is to hold Lars
Prism.
7. the system according to claim 6 based on the double detections of Terahertz, it is characterised in that：The thickness of the zinc telluridse crystal
Degree is 1mm.
8. the system according to claim 7 based on the double detections of Terahertz, it is characterised in that：The type of the lock-in amplifier
Number be SR830.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820184110.1U CN207850915U (en) | 2018-02-02 | 2018-02-02 | A kind of system based on the double detections of Terahertz |
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| CN201820184110.1U CN207850915U (en) | 2018-02-02 | 2018-02-02 | A kind of system based on the double detections of Terahertz |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110365403A (en) * | 2019-07-05 | 2019-10-22 | 北京无线电计量测试研究所 | A kind of Terahertz Broad-band Modulated Signal measuring device and method |
-
2018
- 2018-02-02 CN CN201820184110.1U patent/CN207850915U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110365403A (en) * | 2019-07-05 | 2019-10-22 | 北京无线电计量测试研究所 | A kind of Terahertz Broad-band Modulated Signal measuring device and method |
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