CN108827888A - A kind of mixing pumped alkali metal gas chamber density ratio control method - Google Patents
A kind of mixing pumped alkali metal gas chamber density ratio control method Download PDFInfo
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- CN108827888A CN108827888A CN201810394841.3A CN201810394841A CN108827888A CN 108827888 A CN108827888 A CN 108827888A CN 201810394841 A CN201810394841 A CN 201810394841A CN 108827888 A CN108827888 A CN 108827888A
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- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
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Abstract
A kind of mixing pumped alkali metal gas chamber density ratio control method.The method that this method utilizes distilation controls a kind of atomic weight of alkali metal and then changes two kinds of alkali metal atom density ratios, and vapo(u)rizing temperature is combined to realize that density ratio accurately controls with molecular pump pumping speed.Compared with traditional mixing pumped alkali metal gas chamber density ratio control method, the control of vapo(u)rizing temperature is carried out using oil bath pan, keeps the temperature of alkali metal gas chamber more uniform accurate.This method uses white light source to carry out the spectral absorption measurement of alkali metal gas chamber simultaneously, and alkali metal atom density ratio is calculated.It is a kind of method of capable of on-line and on-line measurement in mixing pumped alkali metal gas chamber manufacturing process, can greatly improve the precision of mixing pumped alkali metal gas chamber density ratio and the preparation efficiency of gas chamber.
Description
Technical field
The present invention relates to the production of the alkali metal atom of atom magnetometer and density ratio control field.Especially in mixing pumping
The control for carrying out alkali metal atom density ratio in alkali metal gas chamber manufacturing process using the method for distilation, makes density ratio control
It is more accurate.
Background technique
In no spin-exchange relaxation (SERF) atom magnetometer, uniform atomic polarizability can guarantee magnetometer signal
Consistency, reduce gradient noise, how to obtain uniform atomic polarizability is required in experimental study solve the problems, such as.Mixing
The appearance of optical pumping efficiently solves the problems, such as that atom polarization uniformity is poor.Two kinds of alkali metal atom density contents are different,
Light interacts with the lesser alkali metal atom of optical depth and is allowed to polarize, and by the mutual collision between alkali metal atom, makes
The biggish alkali metal atom polarization of optical depth to be measured, can make atom polarization more uniform, meanwhile, experiment shows atom polarization
Efficiency is also higher.The density of two kinds of alkali metal atoms has an optimum ratio, can be to meet atomic polarizability uniform under this ratio
Under the conditions of, moreover it is possible to influence of the pumping light power-frequency fluctuation to alkali metal gas chamber is reduced, in alkali metal gas chamber manufacturing process such as
What controls the ratio of two kinds of alkali metal atoms, and there is no good methods at present.
In traditional production method, one is being caught up with two kinds of alkali metal gas chambers in glass envelope with flame, this method is missed
Difference is very big, largely relies on the experience of operator, and the alkali metal atom density ratio and design value for the gas chamber made
There is biggish poor evidence.Another method is chemical reaction method, anti-by two sets of chemistry in an alkali metal gas chamber manufacturing process
Answer process to corresponding two kinds of alkali metal atoms, although real using chemical reaction method production single alkali metal gas atomic air chamber
It is existing, but the mixing pumped alkali metal gas chamber of two kinds of alkali metal atoms needs high temperature and pressure, and condition is extremely harsh complicated, it is difficult to realize.
It is therefore desirable to study a kind of control method of mixing pumped alkali metal gas chamber density ratio that at this stage can be practical.
Summary of the invention
Technology of the invention solves the problems, such as：Overcome the deficiencies in the prior art proposes a kind of mixing pumped alkali metal gas
Room density ratio control method, this method application oil bath pan carry out vapo(u)rizing temperature control, real in conjunction with vapo(u)rizing temperature and molecular pump pumping speed
Existing alkali metal atom density ratio changes；Using the method for white-light spectrum absorptiometry, experiment mixes alkali in pumped alkali metal gas chamber
The measurement of metal atom density ratio.
A kind of mixing pumped alkali metal gas chamber density ratio control method proposed by the present invention, density ratio control are directed to two
The control of kind of alkali metal atom density ratio, the boiling point of the first alkali metal atom are higher than the boiling point of second of alkali metal atom, into
Need to use the first alkali metal atom ampoule bottle, second of alkali metal atom peace in row alkali metal atom density ratio control process
Small jar bottle, alkali metal gas chamber, glass piping, oil bath pan, white light source, fiber spectrometer；The density ratio control method include with
Lower operating procedure：
Step (1) is to connection the first alkali metal atom ampoule bottle, second of alkali metal atom ampoule bottle, alkali metal gas chamber
Glass piping carry out vacuum pumping；Vacuum pumping is carried out using molecular pump in the step；
The first less alkali metal atom and second more of alkali metal atom are rushed to alkali with flame gun by step (2)
In metal air chamber；
The alkali metal atom density ratio R1 of step (3) measurement under this state：The light that white light source generates passes through alkali metal gas
Enter fiber spectrometer behind room, the density ratio R1 of alkali metal atom is calculated by the power of different absorption spectrums；This is surveyed
It needs to be filled with a certain amount of inert gas during amount, so as to which the absorption line of alkali metal atom can be measured；
Alkali metal gas chamber is completely soaked by step (4) with oil bath pan, is opened molecular pump and is vacuumized to glass piping, takes out
Walk gas used in measurement；Oil bath temperature is set according to the vacuum degree of glass piping；Saturation is calculated using Antoine equation to steam
Vapour pressure determines that the boiling point of two kinds of alkali metal under certain vacuum degree, oil bath temperature are set higher than second of alkali metal atom
Boiling point is simultaneously lower than the first alkali metal atom boiling point；Under this state, second of alkali metal atom is largely taken away and the first alkali
Metallic atom is preserved in alkali metal gas chamber, so that alkali metal atom density ratio be made to change；
Step (5) is impregnated after a certain period of time, is repeated step (3), is obtained new alkali metal atom density ratio R2；
Step (6) constantly repeats the process of this step (3) to step (5), until the alkali metal atom density needed for obtaining
Compare R；Then it is filled with suitable buffer gas in alkali metal gas chamber and gas is quenched, buffer gas is used to reduce alkali metal atom
The relaxation that collision generates is spread to air chamber wall, gas is quenched and is used to absorb the photon generated during alkali metal atom depolarization；
Then alkali metal gas chamber is sealed to and is removed alkali metal gas chamber, mixing pumped alkali metal gas chamber completes.
Further, in above-mentioned mixing pumped alkali metal gas chamber density ratio control method, K-Rb mixed alkali metal is such as made
Gas chamber, then the first alkali metal atom is K, and second of alkali metal atom is Rb.Rb-Cs mixed alkali metal gas can also be made
Room, then the first alkali metal atom is Rb, and second of alkali metal atom is Cs.
Further, fiber spectrometer in the step of above-mentioned mixing pumped alkali metal gas chamber density ratio control method (3) leads to
It crosses computer and related software carries out analytical calculation and obtains the density ratio R of alkali metal atom.
Further, in above-mentioned mixing pumped alkali metal gas chamber density ratio control method, the glass piping is in connection the
After a kind of alkali metal atom ampoule bottle, second of alkali metal atom ampoule bottle, alkali metal gas chamber, it is also connected with recycling glass in turn
Glass pipe and U-shaped cold neck, step (2) is by the first less alkali metal atom and second more of alkali metal atom flame gun
After rushing in alkali metal gas chamber, extra alkali metal is caught up in recycling glass tube, and U-shaped cold neck is for preventing alkali metal to subsequent pipe
Road pollutes.
Further, in above-mentioned mixing pumped alkali metal gas chamber density ratio control method, the indifferent gas that is filled in step (3)
Body can for helium 4, nitrogen, helium 3, neon 21, xenon 129, xenon 131 be one such or a variety of mixing.
The advantage of the invention is that：
1, distilation method is applied in the manufacturing process of mixing pumped alkali metal gas chamber.By controlling a kind of alkali metal
Atomic weight so that change two kinds of alkali metal atom density ratios, and combine the vacuum degree of vapo(u)rizing temperature and molecular pump pumping speed can be fast
Speed effectively makes the mixing pumped alkali metal gas chamber of certain density ratio.
2, alkali metal gas chamber is heated using the mode of oil bath.Oil bath is compared to traditional heating oven, heating temperature
Uniformly, temperature control precision is high for degree, can preferably carry out the control and measurement of density ratio.
It 3, is the method for a kind of On-line Control and on-line measurement.The measurement of density ratio is carried out using white light source, and is passed through
The method of distilation changes alkali metal atom density ratio, reaches final required by real-time measurement and control repeatedly and mixes
Close pumped alkali metal gas chamber density ratio.
Detailed description of the invention
Fig. 1 is that distilation method of the invention mixes pumped alkali metal gas chamber density ratio control lab diagram.
Fig. 2 is that white-light spectrum of the invention absorbs on-line measurement alkali metal gas chamber density ratio lab diagram.
Detailed description of the invention：
1, alkali metal K ampoule bottle, 2, alkali metal Rb ampoule bottle, 3, alkali metal gas chamber, 4, recycling glass tube, 5, U-shaped cold neck,
6, molecular pump, 7, helium tank, 8, oil bath pan, 9, temperature controller, 10, white light source, 11, beam expanding lens, 12, plus lens, 13, optical fiber
Coupling head, 14, optical fiber, 15, fiber spectrometer, 16, computer and related software.
Specific embodiment
A kind of mixing pumped alkali metal gas chamber density ratio control method based on distilation method.Utilize the side of distilation
Method controls a kind of atomic weight of alkali metal and then changes two kinds of alkali metal atom density ratios, and combines vapo(u)rizing temperature and molecular pump
Pumping speed realizes that density ratio accurately controls.The control that vapo(u)rizing temperature is carried out using oil bath pan, keeps the temperature of alkali metal gas chamber more equal
It is even accurate.The spectral absorption measurement of alkali metal gas chamber is carried out using white light source simultaneously, and alkali metal atom density is calculated
Than.The method is a kind of method of capable of on-line and on-line measurement in mixing pumped alkali metal gas chamber manufacturing process, can be very big
Raising mixing pumped alkali metal gas chamber density ratio precision.With reference to the accompanying drawing 1, the present invention is described in detail by Fig. 2.
Two kinds of alkali metal atoms in following embodiment are alkali metal K and alkali metal Rb.
Alkali metal K ampoule bottle 1, alkali metal Rb ampoule bottle 2, alkali metal gas chamber 3 are connected, and take out very using molecular pump 6
Do-nothing operation.Less alkali metal K and more alkali metal Rb are rushed in alkali metal gas chamber 3 with flame gun.Extra alkali metal
It catches up in recycling glass tube 4, U-shaped cold neck 5 is added in glass piping prevents alkali metal from polluting to subsequent pipeline.Measure this shape
Alkali metal atom density ratio R1 under state, the light that white light source 10 generates carry out hot spot by beam expanding lens 11 and expand shaping, rear logical
Alkali metal gas chamber 3 is crossed, enters optical fiber coupling head 13 through plus lens 12, is imported in fiber spectrometer 15 through optical fiber 14, by calculating
Machine and related software 16 carry out analytical calculation.The density ratio of alkali metal atom is calculated by the power of different absorption spectrums
R1.It needs to be filled with a certain amount of inert gas in this measurement process, so as to which the absorption line of alkali metal atom, this implementation can be measured
Helium is filled with using helium tank 7 in example to measure.Alkali metal gas chamber 3 is completely soaked with oil bath pan 8, it is right to open molecular pump 6
Glass piping is vacuumized, and takes gas used in measurement away；Oil bath temperature is set according to the vacuum degree of glass piping.It utilizes
Antoine equation calculates the boiling point for two kinds of alkali metal that saturated vapor pressure determines under certain vacuum degree, the setting of 9 temperature of temperature controller
For higher than Rb atom boiling point and lower than K atom boiling point.Under this state, Rb atom is largely taken away and K atom is preserved in alkali
In metal air chamber 3, so that alkali metal atom density ratio be made to change.After a certain period of time, it re-measures, obtains new alkali metal
Atomic density ratio R2.The calculating process of alkali metal atom density ratio is constantly repeated, until the alkali metal atom density needed for obtaining
Compare R.Be filled with suitable buffer gas in alkali metal gas chamber 3 and be quenched gas, buffer gas be used to reduce alkali metal atom to
The relaxation that air chamber wall diffusion collision generates is quenched gas and is used to absorb the photon generated during alkali metal atom depolarization；So
Alkali metal gas chamber 3 is sealed afterwards and removes alkali metal gas chamber 3.Mixing pumped alkali metal gas chamber completes.
The content that description in the present invention is not described in detail belongs to the well-known technique of those skilled in the art.
Claims (7)
1. a kind of mixing pumped alkali metal gas chamber density ratio control method, it is characterised in that：Density ratio control is directed to two kinds
The control of alkali metal atom density ratio, the boiling point of the first alkali metal atom are higher than the boiling point of second of alkali metal atom, are carrying out
Need to use the first alkali metal atom ampoule bottle, second of alkali metal atom ampoule in alkali metal atom density ratio control process
Bottle, alkali metal gas chamber, glass piping, oil bath pan, white light source, fiber spectrometer；The density ratio control method includes following
Operating procedure：
Step (1) is to the glass for connecting the first alkali metal atom ampoule bottle, second of alkali metal atom ampoule bottle, alkali metal gas chamber
Glass pipeline carries out vacuum pumping；
The first less alkali metal atom and second more of alkali metal atom are rushed to alkali metal with flame gun by step (2)
In gas chamber；
The alkali metal atom density ratio R1 of step (3) measurement under this state：The light that white light source generates passes through after alkali metal gas chamber
Into fiber spectrometer, the density ratio R1 of alkali metal atom is calculated by the power of different absorption spectrums；This was measured
Cheng Zhongxu is filled with a certain amount of inert gas, so as to which the absorption line of alkali metal atom can be measured；
Alkali metal gas chamber is completely soaked by step (4) with oil bath pan, is opened molecular pump and is vacuumized to glass piping, takes survey away
Gas used in amount；Oil bath temperature is set according to the vacuum degree of glass piping；Saturated vapor pressure is calculated using Antoine equation,
Determine that the boiling point of two kinds of alkali metal under certain vacuum degree, oil bath temperature are set higher than second of alkali metal atom boiling point simultaneously
Lower than the first alkali metal atom boiling point；Under this state, second of alkali metal atom is largely taken away and the first alkali metal is former
Son is preserved in alkali metal gas chamber, so that alkali metal atom density ratio be made to change；
Step (5) is impregnated after a certain period of time, is repeated step (3), is obtained new alkali metal atom density ratio R2；
Step (6) constantly repeats the process of this step (3) to step (5), until the alkali metal atom density ratio R needed for obtaining；
Then it is filled with suitable buffer gas in alkali metal gas chamber and gas is quenched, buffer gas is used to reduce alkali metal atom to gas
The relaxation that locular wall diffusion collision generates is quenched gas and is used to absorb the photon generated during alkali metal atom depolarization；Then
Alkali metal gas chamber is sealed to and is removed alkali metal gas chamber, mixing pumped alkali metal gas chamber completes.
2. mixing pumped alkali metal gas chamber density ratio control method according to claim 1, which is characterized in that the step
(1) vacuum pumping is carried out using molecular pump in.
3. mixing pumped alkali metal gas chamber density ratio control method according to claim 1, which is characterized in that the first alkali
Metallic atom is K, and second of alkali metal atom is Rb.
4. mixing pumped alkali metal gas chamber density ratio control method according to claim 1, which is characterized in that the first alkali
Metallic atom is Rb, and second of alkali metal atom is Cs.
5. mixing pumped alkali metal gas chamber density ratio control method according to claim 1, which is characterized in that the step
(3) fiber spectrometer in carries out analytical calculation by computer and related software and obtains the density ratio R of alkali metal atom.
6. mixing pumped alkali metal gas chamber density ratio control method according to claim 1, which is characterized in that the glass
Pipeline is after connecting the first alkali metal atom ampoule bottle, second of alkali metal atom ampoule bottle, alkali metal gas chamber, also successively
It is connected with recycling glass tube and U-shaped cold neck, step (2) is by the first less alkali metal atom and second more of alkali metal
After atom is rushed in alkali metal gas chamber with flame gun, extra alkali metal is caught up in recycling glass tube, and U-shaped cold neck is for preventing alkali
Metal pollutes subsequent pipeline.
7. mixing pumped alkali metal gas chamber density ratio control method according to claim 1, which is characterized in that the step
(3) inert gas being filled in can for helium 4, nitrogen, helium 3, neon 21, xenon 129, xenon 131 be one such or a variety of mixing.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110274472A (en) * | 2019-01-23 | 2019-09-24 | 北京大学 | It is a kind of for extending the plated film alkali metal atom air chamber aging system and application method of atomic spin relaxation life |
| CN112540636A (en) * | 2020-12-03 | 2021-03-23 | 北京航天控制仪器研究所 | Large-gradient temperature field generating device for controlling distribution of alkali metal in atomic gas chamber |
| CN114199831A (en) * | 2020-09-02 | 2022-03-18 | 中国科学院大连化学物理研究所 | Device and method for filling alkali metal vapor in hollow-core photonic crystal fiber and detecting alkali metal vapor and application of device and method |
| CN114199481A (en) * | 2021-11-11 | 2022-03-18 | 北京自动化控制设备研究所 | Method for manufacturing vacuum atomic gas chamber and device using same |
| CN114408266A (en) * | 2022-01-24 | 2022-04-29 | 散裂中子源科学中心 | Glass pipeline device for preparing helium three-neutron polarized glass gas chamber and application thereof |
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| CN103954573A (en) * | 2014-05-07 | 2014-07-30 | 东南大学 | Method and system for real-time monitoring of alkali metal atomic ratio |
| CN105043930A (en) * | 2015-07-24 | 2015-11-11 | 中国电子科技集团公司第四十九研究所 | Detection device and method for metal steam atomic density of microstructure alkali metal gas chambers |
| CN107167437A (en) * | 2017-05-15 | 2017-09-15 | 北京航空航天大学 | A kind of atomic density accurate measurement method based on mixing optical pumping |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103954573A (en) * | 2014-05-07 | 2014-07-30 | 东南大学 | Method and system for real-time monitoring of alkali metal atomic ratio |
| CN105043930A (en) * | 2015-07-24 | 2015-11-11 | 中国电子科技集团公司第四十九研究所 | Detection device and method for metal steam atomic density of microstructure alkali metal gas chambers |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110274472A (en) * | 2019-01-23 | 2019-09-24 | 北京大学 | It is a kind of for extending the plated film alkali metal atom air chamber aging system and application method of atomic spin relaxation life |
| CN114199831A (en) * | 2020-09-02 | 2022-03-18 | 中国科学院大连化学物理研究所 | Device and method for filling alkali metal vapor in hollow-core photonic crystal fiber and detecting alkali metal vapor and application of device and method |
| CN114199831B (en) * | 2020-09-02 | 2023-08-04 | 中国科学院大连化学物理研究所 | Device, method and application for filling alkali metal vapor and detecting in hollow photonic crystal fiber |
| CN112540636A (en) * | 2020-12-03 | 2021-03-23 | 北京航天控制仪器研究所 | Large-gradient temperature field generating device for controlling distribution of alkali metal in atomic gas chamber |
| CN114199481A (en) * | 2021-11-11 | 2022-03-18 | 北京自动化控制设备研究所 | Method for manufacturing vacuum atomic gas chamber and device using same |
| CN114408266A (en) * | 2022-01-24 | 2022-04-29 | 散裂中子源科学中心 | Glass pipeline device for preparing helium three-neutron polarized glass gas chamber and application thereof |
| CN114408266B (en) * | 2022-01-24 | 2023-11-21 | 散裂中子源科学中心 | Glass pipeline device for preparing helium three-neutron polarized glass air chamber and application thereof |
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Application publication date: 20181116 |