CN2476019Y - Laser polarized gas xenon dynamic device - Google Patents
Laser polarized gas xenon dynamic device Download PDFInfo
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- CN2476019Y CN2476019Y CN 01239993 CN01239993U CN2476019Y CN 2476019 Y CN2476019 Y CN 2476019Y CN 01239993 CN01239993 CN 01239993 CN 01239993 U CN01239993 U CN 01239993U CN 2476019 Y CN2476019 Y CN 2476019Y
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- glass
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- xenon
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- tube
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Abstract
The utility model discloses a dynamic device of laser polarized noble gas xenon, which comprises a glass tube, a stainless steel vacuum valve and a stainless steel tube. The utility model is characterized in that an alkali metal storage chamber is connected to a light pumped bubble which is arranged in the center of a magnetic coil made of coils and is connected to the glass tube via a glass vacuum valve. A test sample tube is arranged in a probe coil, and is connected to the light pumped bubble through the glass vacuum valve and a T shaped tube. The glass vacuum valve is connected to a U-shape tube. The utility model has the advantages of simple structure and convenient operation, and produces laser polarized noble gas xenon, which mixes with non-polarized noble gas to make the laser polarized noble gas xenon complete polarized transference, cross polarization and cross relaxation.
Description
The utility model relates to a kind of laser polarized gas xenon dynamic apparatus, be applicable to the magnetic resonance imaging of biosome and material, polarization shifts the nuclear spin polarization of enhancing liquid state and solid-state atom and molecule and measurement and the research of structure, the NMR signal of material surface in middle micropore new material aperture strengthens.
Laser light pumping alkali metal atom (Cs, Rb, K, Na), make it the spin polarization of electronics height, Ji Hua alkali metal atom and non-polarised xenon atom spin exohange collision in succession, angular momentum shifts and to make the xenon atom nuclear spin polarization, following two kinds of general at present employing, a kind of is sample hose or bubble technology, independently encapsulate alkali metal atom and gas xenon simultaneously in condition of high vacuum degree glass tube or the ball-type glass envelope at one, also can reach the laser polarized gas xenon atom nuclear spin polarization of same effect, the intensification factor of laser-polarization is 10
3-10
5But because limitation, this method is merely able to study the characteristic and the physical process of alkaline metal and gas xenon itself, is inconvenient to expand research other interested material and biosome; Another kind is a flow system, people [Appl.Phys.Lett. such as Driehuys B, 69 (1996), 1668.] and people [J.Am.Chem.Soc.119 (1997) .11711.] such as Haak.M in their laboratory, also built high capacity laser polarized gas xenon process units, people's such as Driehuys B system comprises Helmholtz coil, optical pumping bubble, tensimeter, glass vacuum system and a spherical gas liquid mixing chamber; People's such as Haak.M device is by the optical pumping chamber, alkaline metal condensing pond, tensimeter and laser-polarization
129The solid-state apotheca of Xe is formed.Because for different application targets, their device is different with this laser polarized gas xenon dynamic apparatus.
The purpose of this utility model has provided a kind of laser polarized gas xenon dynamic apparatus, adopt optical pumping bubble and U type pipe, simple in structure, easy to operate, generation laser polarized gas xenon, polarized gas mix with non-polarized gas, therefore, also make the transfer of laser polarized gas xenon atom nuclear spin polarization degree, cross polarization and cross relaxation.
In order to achieve the above object, the utility model is by the following technical solutions: in optical pumping bubble, glass evacuated valve, glass T type pipe, measuring samples pipe silicon coating is arranged, it can normally be operated in the 130K-370K temperature range, has improved the efficient and the performance of this dynamic apparatus; For using gases at high pressure and have corrosive gas in this device, glass material and stainless steel material have been used in the device segmentation; In order to study the NMR signal that laser-polarization xenon polarization transfer strengthens other atom and molecule, this device has a polarized gas xenon and the mixing cured U type of non-polarized gas pipe, and it is usually operated at liquid nitrogen temperature; The magnetic field of a large-sized Helmholtz coil generation has guaranteed to remain unchanged with the polarised direction of the laser-polarization sample of carrying, and can reduce conveyance loss.
Common glass inside coating material has paraffin, organosilicon and Teflon etc.For specific purpose, this device uses organosilicon material, and experiment shows that it can normally be operated in the 130K-370K temperature range; Design has polarized gas xenon and the mixing cured chamber of non-polarized gas, can study both spin exchange and physical processes easily; Be added with a long column type alkaline metal memotron on the optical pumping bubble, except guaranteeing the long-term work of optical pumping bubble, alkaline metal in device has been consumed, and perhaps installs accident and enters air and make after the alkaline metal oxidation, can refill new alkaline metal and need not change the optical pumping bubble; Be furnished with a Dewar container for liquefied nitrogen on gas xenon bottle, the position by mobile Dewar changes temperature, makes this device to make things convenient for, accurately control is injected the pressure of xenon and reclaimed the gas xenon; Done following improvement:
1) vacuumized part adopts stainless steel.It can install the vacuum diffusion pump of high pumping rate easily, makes the time that is evacuated to desired condition of high vacuum degree significantly reduce; Can charge into an atmospheric pressure above gas xenon or other gas, and gases at high pressure can not produce to system dangerous; The solid-state storage device that can add the laser polarized gas xenon easily.
2) laser pumping bubble and gas mixer partly adopt 95 glass.The important point is to avoid the infringement of the gas of corrosion to system, and for example HCL gas can produce corrosion to the stainless steel inwall; But 95 glass are not produced tangible effect.
3) the glass system inwall uses organic silicon coating.The inwall silicon coating of optical pumping bubble helps to improve the efficient of laser pumping; The silicon coating of delivery pipe (steeping glass evacuated valve to sample hose from optical pumping) has greatly reduced in the course of conveying because the loss of the laser polarized gas xenon polarization that causes with the glass wall collision.
4) part carry glass tube (from optical pumping bubble) to glass evacuated valve to being positioned at large-sized Helmholtz field coil, the polarization of having avoided the polarised direction of laser polarized gas xenon to cause is lost.
5) be added with the mixing cured chamber of gas of U type pipe, the gas xenon of polarization is mixed with non-polarised gas, U type pipe is operated in liquid nitrogen temperature then, and it is solid-state to make it solidify out into, is used to study the transfer of laser polarized gas xenon nuclear spin polarization, cross polarization and cross relaxation process.
The utility model compared with prior art has the following advantages and effect: simple in structure, easy to operate, produce the laser polarized gas xenon, and can study its gaseous state, liquid state and solid-state properties and measurement related physical quantity; The mixing of polarized gas xenon and non-polarized gas, curing make it possible to study laser polarized gas xenon polarization transfer, cross polarization and cross relaxation; The equitable subsection of stainless steel and glass material uses, and can be used in gas dissimilar, different pressures easily; The silicon coating of glass inwall make it possible to prevent atom directly with the collision of glass wall, strengthened the laser light pumping efficiency and reduced the conveyance loss of non-equilibrium polarized gas xenon atom; Solid-state stocking system can be increased easily,, the laser polarized gas xenon of requirement can be produced more easily for biology and the material magnetic resonance imaging and the polarization transfer enhancing atom and molecule polarization research of laser polarized gas xenon.
Fig. 1 is a kind of laser polarized gas xenon dynamic apparatus structural representation.
1 optical pumping bubble-in silicon coating is arranged, capacity 250ml is positioned at Helmholtz field coil center.During work, it is constant under about 330K temperature, laser pumping alkali metal atom steam wherein, and the process spin exohange collision reaches the purpose of polarized gas xenon nuclear spin.
2 measuring samples pipes-in silicon coating is arranged, overall diameter is 10mm.Be positioned at NMR spectrometer probe coil, operating temperature range 335K-130K.Can Laser Measurement the signal of NMR of polarization xenon attitude, liquid state and solid-state enhancing, study biased sample, porosint etc.
3 Helmholtz field coils-be made up of coil 3-1 and 3-2 provide stationary magnetic field (being typically 5 Gausses), to satisfy the condition of laser light pumping and spin exchange.
4 heater strips and heat-insulation layer-be looped around outside the optical pumping bubble, the electric energy that external dc power is provided becomes heat energy, and heating makes alkaline metal become atom vapor, and constant in a desired atomicity density.
5 alkaline metal apotheca-assurance optical pumping bubble has enough alkaline metal, and can constantly inject new alkaline metal in long-term work.
6 U type pipes-can be operated under the liquid nitrogen temperature, mixing cured to guarantee laser polarized gas xenon and other gas (for example HCL).
7 Dewar container for liquefied nitrogen-storage liquid nitrogen are used for working gas is become solid-state.
8 glass evacuated valve-separation region of no pressure or conducting working gass amount to 6, and numbering: 8-1 is to 8-6.
9 stainless-steel vacuum valves-identical with glass evacuated valve action.Amount to 12, numbering: 9-1 is to 9-12.
10 glass tubes-95 glass material, connected system and conducting working gas.
11 tensimeters-measurement gas xenon or other air pressure.
12 stainless-steel tubes-the be analogous to effect of glass tube.
Vacuum tightness during 13 thermocouple vacuum gages-measuring system low vacuum, working range to 1 * 10
-1Pa.
Vacuum tightness during 14 ionization vacuum ga(u)ges-measuring system high vacuum, working range is from 1 * 10
-1Pa begins.
15 N
22 liters of gas cylinder-capacity, N
2Gas is used to increase the efficient of laser pumping vapour of an alkali metal.
16 HCL gas cylinder-high-purity HCL gas, about 1 atmospheric pressure of pressure, be used to study polarization transfer and
1The NMR signal of H strengthens.
17 xenon bottle-steel cylinders, 10 natural xenons of atmospheric commodity (
129The abundance of Xe about 26%).
18 Dewar container for liquefied nitrogen-storage liquid nitrogen are used for cooling and reclaim the gas xenon.
19 memotrons-remain for the setting up solid-state stocking system of laser polarized gas xenon.
20 high vacuum oils expansion pump-power 650W, end vacuum 10
-5Pa, 300 liters/S of pumping speed is used to set up the high vacuum (10 of this dynamic apparatus
-1Pa-10
-4Pa).
21 oil-sealed rotary pumps-power 370W, end vacuum 5 * 10
-4Torr, 2 liters/S of pumping speed is used to set up the low vacuum of this dynamic apparatus (to 10
-1Pa).
22 glass T type pipes-the be used for connection of glass vacuum system device.
Below in conjunction with accompanying drawing the utility model is described in further detail:
For the purpose of the gas xenon of producing a large amount of enhancing nuclear spin polarizations, adopt stainless steel and glass material segmentation to use, solved the potential danger problem that high pressure gas charges in the system and the solid xenon gasification brings; The working pressure table replaces gaseous tension in the mercury column measuring system, no longer worry the danger that the mercury column accidental damage causes, after stainless steel parts, the glass system part of device and NMR spectrometer be connected as a single entity, omitted the stainless-steel vacuum flexible pipe, and directly adopted glass tube to connect; Increase the size of optical pumping bubble, be used to mate the high power semiconductor lasers of new purchase, can improve the quantity of the laser polarized gas xenon of each optical pumping spin exchange cycle acquisition; A laser polarized gas xenon and the mixing cured U type of non-polarized gas pipe make it possible to the function that expanding system is studied non-equilibrium nuclear spin polarization transfer, cross polarization and cross relaxation.
According to Fig. 1 as can be known, optical pumping bubble 1 is connected with alkaline metal apotheca 5, and optical pumping is steeped in 1 silicon coating, and it is 250ml that 1 capacity is steeped in optical pumping, is positioned at Helmholtz field coil center, and during work, it is constant under about 330K temperature.Laser pumping alkali metal atom steam wherein, the process spin exohange collision reaches the purpose of polarized gas xenon nuclear spin.Alkaline metal apotheca 5 guarantees that the optical pumpings bubble has enough alkaline metal in long-term work, and the alkaline metal in device consumed, and perhaps installs accident and enters air and make the alkaline metal oxidation, can refill new alkaline metal and need not change optical pumping bubble 1; Optical pumping bubble 1 is positioned over the Helmholtz hub of a spool of being made up of coil 3-1 and 3-2.The Helmholtz field coil provides stationary magnetic field (being typically 5 Gausses), to satisfy the condition of laser light pumping and spin exchange; Heater strip and heat-insulation layer 4 are looped around outside the optical pumping bubble 1, and the electric energy that external dc power is provided becomes heat energy, and heating makes alkaline metal become atom vapor, and constant in a desired atomicity density; Optical pumping bubble 1 is connected glass tube 10 by glass evacuated valve 8-3 with 8-4.Measuring samples pipe 2 is positioned in the NMR spectrometer probe coil, is connected with optical pumping bubble 1 by glass evacuated valve 8-1, glass T type pipe 22 and glass evacuated valve 8-3, is connected with U type pipe 6 by glass evacuated valve 8-1, glass T type pipe 22 and glass evacuated valve 8-2.In the measuring samples pipe 2 silicon coating is arranged, overall diameter is 10mm, is positioned at NMR spectrometer probe coil, operating temperature range 335K-130K.Can Laser Measurement the NMR signal of polarization xenon attitude, liquid state and solid-state enhancing, research biased sample, porosint etc., glass evacuated valve 8-1,8-2 has silicon coating in the glass T type pipe 22 between the 8-3, prevent the polarized gas xenon by the time polarization lose; U type pipe 6 is connected with glass glass T type pipe 22 by glass evacuated valve 8-2, and the other end connects glass tube 10 respectively and is connected with optical pumping bubble 1 by glass evacuated valve 8-4.Dewar container for liquefied nitrogen 7 is arranged outside the U type pipe 6, solidify to guarantee that laser polarized gas xenon and other gas (for example HCL) are blended under the liquid nitrogen temperature; N
2Gas cylinder 15 is connected N by glass evacuated valve 8-5 with glass tube 10
2Gas is used to increase the efficient of laser pumping vapour of an alkali metal; N
2Gas cylinder 15 is connected with glass tube 10 by glass evacuated valve 8-6, in high-purity HCL gas is housed, about 1 atmospheric pressure of pressure, be used to study polarization transfer with
1The NMR signal of H strengthens; Glass tube 10 is connected with stainless-steel vacuum valve 9-1, connects stainless-steel vacuum valve 9-2 and 9-3 again.Stainless-steel vacuum valve 9-2 and 9-4 outer end increase the equipment mouth for reserving, and temporarily empty, pressure gauge 11 is directly installed in the stainless-steel vacuum system, is used for measurement gas xenon or other air pressure; Thermocouple vacuum gage 13 is connected stainless-steel vacuum valve 9-5 with ionization vacuum ga(u)ge 14 by stainless-steel vacuum valve 9-5 and is connected on the stainless-steel tube 12, the vacuum tightness when being respectively applied for the high and low vacuum of measurement mechanism; Memotron 19 remains for setting up the solid-state stocking system of laser polarized gas xenon, and an end connects stainless-steel tube 12 by stainless-steel vacuum valve 9-8, be equipped with in stainless-steel tube 12 other ends connect by stainless-steel vacuum valve 9-9 10 natural xenon bottles 17 of atmospheric commodity (
129The abundance of Xe about 26%).Xenon bottle 17 is housed in the Dewar container for liquefied nitrogen bottle 18, and the position by Dewar container for liquefied nitrogen 18 changes temperature, makes this device can make things convenient for, accurately control the pressure of injecting gas xenon and reclaims the gas xenon; High vacuum oil diffuse pump 20 is connected stainless-steel tube 12 with oil-sealed rotary pump 21 by stainless-steel vacuum valve 9-6, is used to set up the desired vacuum tightness of this dynamic apparatus.Three stainless-steel vacuum valve 9-7 are arranged between them, and 9-11 and 9-10 cut off atmosphere and used at oil-sealed rotary pump 21 shutdown extraction gas when stainless-steel vacuum valve 9-12 is used for work.
Claims (5)
1, a kind of laser polarized gas xenon dynamic apparatus, it is by glass tube (10), stainless-steel vacuum valve (9-1), stainless-steel tube (12), thermocouple vacuum gage (13), ionization vacuum ga(u)ge (14) constitutes, it is characterized in that optical pumping bubble (1) is connected with alkaline metal apotheca (5), optical pumping bubble (1) is positioned over by coil (3-1), (3-2) the field coil center of Zu Chenging, optical pumping bubble (1) is by glass evacuated valve (8-3), (8-4) connect glass tube (10), measuring samples pipe (2) is positioned in the spectrometer probe coil, by glass evacuated valve (8-1), glass T type pipe (22) is connected with optical pumping bubble (1) with glass evacuated valve (8-3), and glass evacuated valve (8-2) is connected with U type pipe (6).
2, a kind of laser polarized gas xenon dynamic apparatus according to claim 1, it is characterized in that U type pipe (6) is connected with glass T type pipe (22) by glass evacuated valve (8-2), the other end connects glass tube (10) respectively and is connected with optical pumping bubble (1) by glass evacuated valve (8-4), and Dewar container for liquefied nitrogen (7) is arranged outside the U type pipe (6).
3, a kind of laser polarized gas xenon dynamic apparatus according to claim 1, it is characterized in that glass tube (10) is connected with stainless-steel vacuum valve (9-1), is equipped with stainless-steel vacuum valve (9-2), (9-3), (9-4), (9-5), (9-6) on glass tube (10).
4, a kind of laser polarized gas xenon dynamic apparatus according to claim 1, it is characterized in that thermocouple vacuum gage (13) and ionization vacuum ga(u)ge (14) are connected on the stainless-steel tube (12) by stainless-steel vacuum valve (9-5), stainless-steel vacuum valve (9-8) is connected with stainless-steel tube (12), stainless-steel tube (12) other end connects xenon bottle (17) by stainless-steel vacuum valve (9-9), and xenon bottle (17) is housed in the Dewar container for liquefied nitrogen bottle (18).
5, a kind of laser polarized gas xenon dynamic apparatus according to claim 1 is characterized in that in optical pumping bubble (1), glass evacuated valve (8-1), (8-2), (8-3), the glass glass T type pipe (22) silicon coating being arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01239993 CN2476019Y (en) | 2001-05-10 | 2001-05-10 | Laser polarized gas xenon dynamic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01239993 CN2476019Y (en) | 2001-05-10 | 2001-05-10 | Laser polarized gas xenon dynamic device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2476019Y true CN2476019Y (en) | 2002-02-06 |
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ID=33652313
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01239993 Expired - Fee Related CN2476019Y (en) | 2001-05-10 | 2001-05-10 | Laser polarized gas xenon dynamic device |
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| CN (1) | CN2476019Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103558782A (en) * | 2013-11-14 | 2014-02-05 | 中国科学院武汉物理与数学研究所 | Rapid pneumatic optical pumping bubble protecting device |
| CN103699156A (en) * | 2013-12-20 | 2014-04-02 | 中国科学院武汉物理与数学研究所 | System and method for heating optical pumping bubbles by using different temperatures |
| CN104921726A (en) * | 2015-05-26 | 2015-09-23 | 中国科学院武汉物理与数学研究所 | Liquid nitrogen level control and display device for collecting hyperpolarized xenon |
| CN106456808A (en) * | 2014-02-21 | 2017-02-22 | 杜克大学 | Hyperpolarized noble gas production systems with nanocluster suppression, detection and/or filtering and related methods and devices |
| CN107328803A (en) * | 2017-06-19 | 2017-11-07 | 同济大学 | Nanoaperture structure in solid pore media129Xe Nuclear Magnetic Resonance Measurement characterizing methods |
-
2001
- 2001-05-10 CN CN 01239993 patent/CN2476019Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103558782A (en) * | 2013-11-14 | 2014-02-05 | 中国科学院武汉物理与数学研究所 | Rapid pneumatic optical pumping bubble protecting device |
| CN103558782B (en) * | 2013-11-14 | 2016-03-16 | 中国科学院武汉物理与数学研究所 | A kind of fast pneumatic protection optical pumping bulb apparatus |
| CN103699156A (en) * | 2013-12-20 | 2014-04-02 | 中国科学院武汉物理与数学研究所 | System and method for heating optical pumping bubbles by using different temperatures |
| CN103699156B (en) * | 2013-12-20 | 2016-02-24 | 中国科学院武汉物理与数学研究所 | A kind of system and method utilizing different temperatures to heat optical pumping bubble |
| CN106456808A (en) * | 2014-02-21 | 2017-02-22 | 杜克大学 | Hyperpolarized noble gas production systems with nanocluster suppression, detection and/or filtering and related methods and devices |
| CN104921726A (en) * | 2015-05-26 | 2015-09-23 | 中国科学院武汉物理与数学研究所 | Liquid nitrogen level control and display device for collecting hyperpolarized xenon |
| CN107328803A (en) * | 2017-06-19 | 2017-11-07 | 同济大学 | Nanoaperture structure in solid pore media129Xe Nuclear Magnetic Resonance Measurement characterizing methods |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |