CN206490889U - A kind of superhigh temperature molecular beam source of use without diaphragm type shock tube - Google Patents
A kind of superhigh temperature molecular beam source of use without diaphragm type shock tube Download PDFInfo
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- CN206490889U CN206490889U CN201720212006.4U CN201720212006U CN206490889U CN 206490889 U CN206490889 U CN 206490889U CN 201720212006 U CN201720212006 U CN 201720212006U CN 206490889 U CN206490889 U CN 206490889U
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Abstract
The utility model is related to high-energy molecule line and produces field, a kind of superhigh temperature molecular beam source of use without diaphragm type shock tube mainly includes by the alternate vacuum chamber for being divided into vacuum chamber I and vacuum chamber II and vacuum chamber III and constituting of current divider I and current divider II, drive gas feed, main valve, hyperbaric chamber, low-pressure chamber, stream outlet I, current divider I, chopper, stream outlet II, current divider II, steam supply valve, air bleeding valve, by the driving gas feed, main valve, hyperbaric chamber, low-pressure chamber, the shock tube that stream outlet I is sequentially connected composition is located at the vacuum chamber I, the chopper is located at the vacuum chamber II, aperture is provided with the middle of the current divider I and the current divider II.The utility model shock wave heating time is short, and nozzle temperature will not rise quickly, overcomes limitation of the nozzle temperature to material, can produce the molecular beam with higher translational energy；Barrier film is frequently changed without being needed as existing diaphragm type shock tube without diaphragm type shock tube, cost and time is saved.
Description
Technical field
The utility model is related to high-energy molecule line generation technology field, particularly a kind of using without diaphragm type shock tube
Superhigh temperature molecular beam source.
Background technology
Molecular beam technique is a kind of important method of experimentally learning gas-surface interaction.In scattering experiment, production
Life can accurately control the translational energy of molecule and the molecular beam of internal degree of freedom, for learning gas-surface system, obtain
The important informations such as the potential energy on surface, the method for molecular beam is produced at present to be had：Plant beamlet method (seeded beam method)：Make
With the nozzle of a heating, it is generally used for producing molecular beam of the translation energy in units electron-volt (eV), but to line
The control of characteristic, is limited by the maximum operation temperature of nozzle material, it is impossible to produce the molecular beam of higher-energy；Superhigh temperature
Molecular beam source：A branch of composition species for including decomposition can be produced, is the important method for studying surface reaction, an electric arc heated
Nozzle beam source can produce height dissociation molecular beam, still, such molecular beam is contained to be produced due to electrode corrosion
Raw surface receives the copper atom of pollution, is not suitable for needing the scattering experiment of clean surface；Laser blasting source and discharge source：No
Can be limited by nozzle material, can produce the line of of a relatively high energy, but the scope of the rate distribution of gas molecule compared with
Greatly, the more difficult control condition in specific experiment.In order to estimate momentum and energy-related parameter exactly, in the urgent need to one kind can be produced
A kind of method of the molecular beam of raw narrower rate distribution, superhigh temperature molecular beam source of the use without diaphragm type shock tube can be solved
This problem.
Shock tube is typically a cylindricality long tube closed at both ends, and centre is divided into two sections with a diaphragm, and satisfaction is filled with respectively
Desired high-pressure driving gas and low pressure are simulated by driving gas；After rupture of diaphragm, high pressure gas expansion is produced to low-pressure gas
In the shock wave that quickly moves, and produce the dilatational wave propagated to former high pressure gas body end.The compression of shock wave is to make to be driven
The parameter of gas has corresponding change, and such as pressure and temperature are greatly improved, so as to obtain meeting the work that simulation is required
Condition.Because shock wave motion is quite rapid, the experimental gas parameter after shock wave compression can only (be typically millisecond in the of short duration time
Level arrives Microsecond grade) in keep constant, corresponding flowing also only keeps permanent within the of short duration time.The gas stream obtained with shock tube
It is dynamic, the aerodynamics experimental study available for different purposes.
Utility model content
In order to overcome the various defects of existing molecular beam source, the utility model provides a kind of using without diaphragm type shock wave
The superhigh temperature molecular beam source of pipe, it is small that shock tube is installed in vacuum chamber and shock tube volume ratio is traditional, can be easy in experiment
Control condition, estimates momentum and energy-related parameter exactly, is the molecular beam source that a kind of energy produces narrower rate distribution.
The technical scheme that the utility model is used is：
A kind of superhigh temperature molecular beam source of the use without diaphragm type shock tube, it is main to include by current divider I and current divider
The alternate vacuum chambers for being divided into vacuum chamber I and vacuum chamber II and vacuum chamber III and constituting of II, driving gas feed, main valve, high pressure
Room, low-pressure chamber, stream outlet I, current divider I, exhaust outlet I, exhaust outlet II, exhaust outlet III, chopper, stream outlet II, shunting
Device II, steam supply valve, air supply inlet, exhaust outlet IV, air bleeding valve, the air bleeding valve connect the low-pressure chamber and its exhaust outlet IV
In outside the vacuum chamber I, the steam supply valve connects the low-pressure chamber and its air supply inlet is located at outside the vacuum chamber I, described to cut
Ripple device is located in the vacuum chamber II, the exhaust outlet I, exhaust outlet II, the molecule for connecting different pumping speed outside exhaust outlet III respectively
Pump is simultaneously vacuumized to the vacuum chamber I, vacuum chamber II, vacuum chamber III respectively, by the driving gas feed, main valve, high pressure
Room, low-pressure chamber, stream outlet I are sequentially connected composition shock tube, and the shock tube is located at the vacuum chamber I, the current divider I and
Aperture is provided with the middle of the current divider II.
When molecular source works, the vacuum chamber I, vacuum chamber II and vacuum chamber III vacuum can be 10 respectively-2Pa、
10-4Pa、10-6Pa.The shock tube uses helium as driving gas, using nitrogen or oxygen as by purging body, uses nitrogen
The translation energy of the nitrogen molecular line produced when gas is as by purging body is about 1 electron-volt (eV), using oxygen as being driven
Can also be by adjusting the confession of oxygen comprising the dissociation yield for dissociateing the oxygen atom come and molecular beam in the line of outgoing during gas
Tolerance changes, and characterizes using the method for flight time the speed of molecule in the characteristic of nitrogen and oxygen molecule beam, molecular beam
Rate distribution meets Maxwell-Boltzmann distribution.About 2 millimeters to 4 millimeters of the shock wave pipe diameter, 300 millimeters of length.It is described
Main valve is high conductivity valve and for substituting barrier film in diaphragm type shock tube, and its fast response time, the response time about 200 is micro-
Second.Hole diameter in the middle of the current divider I and current divider II is about 0.4 millimeter to 0.8 millimeter, can enter vertical its
The sub-fraction molecular beam penetrated passes through.
In work, driving gas enters the hyperbaric chamber, enters the low-pressure chamber by purging body, reaches after certain condition,
The main valve is opened and closed rapidly, and the mechanical pump of the air bleeding valve of the low-pressure chamber connection takes the great quantities of spare gas of interior away
Body, the vacuum chamber I is expanded into by shock wave heating by purging body by the stream outlet I of hundreds of micron diameters,
Projected along the core of the Ultrasonic Free jet of beam direction from the aperture in the current divider I and enter the vacuum chamber II,
The effect of current divider is to produce high-energy and the molecular flow of the chemical species comprising dissociation.Next, molecular beam by positioned at
The chopper of the vacuum chamber II is tentatively modulated, and then line is again by the aperture in the current divider II, mesh
Be to play collimating effect, the superhigh temperature molecular beam source for meeting requirement of experiment is provided for measurement chamber below, into measurement chamber enter
Other follow-up experiments of row；The molecular pump connected in vacuum line takes each section of unnecessary gas of pipeline away, can keep measuring chamber
Condition of high vacuum degree.
The beneficial effects of the utility model are：
A kind of superhigh temperature molecular beam source of the use without diaphragm type shock tube, the time of shock wave heating is shorter, in work
The temperature of nozzle will not rise quickly, overcome limitation of the nozzle temperature to material so that can produce dynamic with higher translation
The molecular beam of energy；Barrier film is replaced as frequently as without being needed as existing diaphragm type shock tube without diaphragm type shock tube, is saved
Cost and time, the superhigh temperature molecular beam source for meeting requirement of experiment is provided for measurement chamber below.
Brief description of the drawings
Further illustrated with reference to figure of the present utility model：
Fig. 1 is the utility model schematic diagram.
In figure, 1. vacuum chambers, 2. driving gas feeds, 3. main valves, 4. hyperbaric chambers, 5. low-pressure chambers, 6. stream outlet I, 7.
Current divider I, 8. exhaust outlet I, 9. exhaust outlet II, 10. exhaust outlet III, 11. choppers, 12. stream outlet II, 13. current dividers
The vacuum chamber of II, 14. vacuum chamber III, 15. II, 16. vacuum chamber I, 17. steam supply valves, 18. air supply inlets, 19. exhaust outlet IV, 20.
Air bleeding valve.
Embodiment
If Fig. 1 is the utility model schematic diagram, a kind of superhigh temperature molecular beam source of the use without diaphragm type shock tube is main
To include by current divider I 7 and current divider II 13 it is alternate be divided into vacuum chamber I 16 and vacuum chamber II 15 and vacuum chamber III14 and
The vacuum chamber 1 of composition, driving gas feed 2, main valve 3, hyperbaric chamber 4, low-pressure chamber 5, stream outlet I 6), current divider I 7, exhaust
Mouth I 8, exhaust outlet II 9, exhaust outlet III10, chopper 11, stream outlet II 12, current divider II 13, steam supply valve 17, supply
Entrance 18, exhaust outlet IV 19, air bleeding valve 20, the air bleeding valve 20 connects the low-pressure chamber 5 and its exhaust outlet IV 19 is located at institute
State outside vacuum chamber I 16, the steam supply valve 17 connects the low-pressure chamber 5 and its air supply inlet 18 is located at the vacuum chamber I 16
Outside, the chopper 11 is located in the vacuum chamber II 15, the exhaust outlet I 8, exhaust outlet II 9, outside exhaust outlet III 10
The molecular pump of different pumping speed is connected respectively and the vacuum chamber I 16, vacuum chamber II 15, vacuum chamber III14 are vacuumized respectively,
It is sequentially connected by the driving gas feed 2, main valve 3, hyperbaric chamber 4, low-pressure chamber 5, stream outlet I 6 and is constituted shock tube, it is described
Shock tube, which is located in the middle of the vacuum chamber I 16, the current divider I 7 and the current divider II 13, is provided with aperture.
When molecular source works, the vacuum chamber I 16, vacuum chamber II 15 and vacuum chamber III14 vacuum respectively can
For 10-2Pa、10-4Pa、10-6Pa.The shock tube uses helium as driving gas, using nitrogen or oxygen as by purging
Body, the translation energy of the nitrogen molecular line produced during using nitrogen as by purging body is about 1 electron-volt (eV), uses oxygen
It can pass through regulation as the dissociation yield that the oxygen atom dissociateed and molecular beam are also included in the line of outgoing during purging body
The air demand of oxygen is characterized in the characteristic of nitrogen and oxygen molecule beam, molecular beam to change using the method for flight time
The rate distribution of molecule meets Maxwell-Boltzmann distribution.About 2 millimeters to 4 millimeters of the shock wave pipe diameter, length 300
Millimeter.The main valve 3 is high conductivity valve and is used to substitute the barrier film in diaphragm type shock tube, when its fast response time, response
Between about 200 microseconds.Hole diameter in the middle of the current divider I 7 and current divider II 13 is about 0.4 millimeter to 0.8 millimeter,
Can pass through its vertical incident sub-fraction molecular beam.
In work, driving gas enters the hyperbaric chamber 4, enters the low-pressure chamber 5 by purging body, reaches certain condition
Afterwards, the main valve 3 is opened and closed rapidly, and the mechanical pump for the air bleeding valve 20 that the low-pressure chamber 5 is connected takes the big of interior away
Excessive gas is measured, institute is expanded into by the stream outlet I 6 of hundreds of micron diameters by purging body by shock wave heating
State vacuum chamber I 16, along beam direction Ultrasonic Free jet core from the aperture in the current divider I 7 project into
Enter the vacuum chamber II 15, the effect of current divider is to produce high-energy and the molecular flow of the chemical species comprising dissociation.Connect down
Come, molecular beam is tentatively modulated by the chopper 11 positioned at the vacuum chamber II 15, and then line passes through institute again
State the aperture in current divider II 13, it is therefore an objective to play collimating effect, the superelevation for meeting requirement of experiment is provided for measurement chamber below
Warm molecular beam source, other follow-up experiments are carried out into measurement chamber；The molecular pump connected in vacuum line takes pipeline away more than each section
Remaining gas, can keep measuring the condition of high vacuum degree of chamber.
Claims (6)
1. a kind of superhigh temperature molecular beam source of use without diaphragm type shock tube, main to include by current divider I (7) and current divider II
(13) alternate vacuum chamber (1), the driving gas for being divided into vacuum chamber I (16) and vacuum chamber II (15) and vacuum chamber III (14) and constituting
Body import (2), main valve (3), hyperbaric chamber (4), low-pressure chamber (5), stream outlet I (6), current divider I (7), exhaust outlet I (8), exhaust
Mouth II (9), exhaust outlet III (10), chopper (11), stream outlet II (12), current divider II (13), steam supply valve (17), supply
Entrance (18), exhaust outlet IV (19), air bleeding valve (20), the air bleeding valve (20) connect the low-pressure chamber (5) and its exhaust outlet IV
(19) it is located at the vacuum chamber I (16) outside, the steam supply valve (17) connects the low-pressure chamber (5) and its air supply inlet (18) position
In the vacuum chamber I (16) outside, the chopper (11) is located in the vacuum chamber II (15), the exhaust outlet I (8), exhaust
Mouth II (9), exhaust outlet III (10) connect the molecular pump of different pumping speed and respectively to the vacuum chamber I (16), vacuum chamber respectively outside
II (15), vacuum chamber III (14) are vacuumized, it is characterized in that：By it is described driving gas feed (2), main valve (3), hyperbaric chamber (4),
Low-pressure chamber (5), stream outlet I (6) are sequentially connected composition shock tube, and the shock tube is located at the vacuum chamber I (16), described point
Aperture is provided with the middle of stream device I (7) and the current divider II (13).
2. a kind of superhigh temperature molecular beam source of the use according to claim 1 without diaphragm type shock tube, it is characterized in that：Dividing
When component works, the vacuum of the vacuum chamber I (16), vacuum chamber II (15) and vacuum chamber III (14) can be 10 respectively-2Pa、
10-4Pa、10-6Pa。
3. a kind of superhigh temperature molecular beam source of the use according to claim 1 without diaphragm type shock tube, it is characterized in that：It is described
Shock tube uses helium as driving gas, using nitrogen or oxygen as by purging body, during using nitrogen as by purging body
The translation energy of the nitrogen molecular line of generation is about 1 electron-volt (eV), using oxygen as by the line of outgoing during purging body
In also comprising dissociateing the oxygen atom come and the dissociation yield of molecular beam can change by adjusting the air demand of oxygen, and make
The rate distribution that molecule in the characteristic of nitrogen and oxygen molecule beam, molecular beam is characterized with the method for flight time meets Max
Wei-ANALOGY OF BOLTZMANN DISTRIBUTION.
4. a kind of superhigh temperature molecular beam source of the use according to claim 1 without diaphragm type shock tube, it is characterized in that：It is described
About 2 millimeters to 4 millimeters of shock wave pipe diameter, 300 millimeters of length.
5. a kind of superhigh temperature molecular beam source of the use according to claim 1 without diaphragm type shock tube, it is characterized in that：It is described
Main valve (3) is high conductivity valve and is used to substitute the barrier film in diaphragm type shock tube, its fast response time, response time about 200
Microsecond.
6. a kind of superhigh temperature molecular beam source of the use according to claim 1 without diaphragm type shock tube, it is characterized in that：It is described
Hole diameter in the middle of current divider I (7) and the current divider II (13) is about 0.4 millimeter to 0.8 millimeter, can enter vertical its
The sub-fraction molecular beam penetrated passes through.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720212006.4U CN206490889U (en) | 2017-02-24 | 2017-02-24 | A kind of superhigh temperature molecular beam source of use without diaphragm type shock tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201720212006.4U CN206490889U (en) | 2017-02-24 | 2017-02-24 | A kind of superhigh temperature molecular beam source of use without diaphragm type shock tube |
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| CN206490889U true CN206490889U (en) | 2017-09-12 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109729636A (en) * | 2017-10-31 | 2019-05-07 | 中国科学院大连化学物理研究所 | Continuous molecular beam source system that is a kind of compact-sized and adjusting wide temperature range |
| RU191175U1 (en) * | 2019-05-24 | 2019-07-29 | Федеральное государственное бюджетное учреждение науки Физический институт им. П.Н. Лебедева Российской академии наук | Atomic vaporizer |
| RU213827U1 (en) * | 2022-06-20 | 2022-09-30 | Общество с ограниченной ответственностью "Совместное предприятие "Квантовые технологии" (ООО "СП "Квант") | COOLABLE SOURCE OF ATOMS |
-
2017
- 2017-02-24 CN CN201720212006.4U patent/CN206490889U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109729636A (en) * | 2017-10-31 | 2019-05-07 | 中国科学院大连化学物理研究所 | Continuous molecular beam source system that is a kind of compact-sized and adjusting wide temperature range |
| RU191175U1 (en) * | 2019-05-24 | 2019-07-29 | Федеральное государственное бюджетное учреждение науки Физический институт им. П.Н. Лебедева Российской академии наук | Atomic vaporizer |
| RU213827U1 (en) * | 2022-06-20 | 2022-09-30 | Общество с ограниченной ответственностью "Совместное предприятие "Квантовые технологии" (ООО "СП "Квант") | COOLABLE SOURCE OF ATOMS |
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