CN1658095A - Field-displacement space cold-vapour atomic clock - Google Patents
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- CN1658095A CN1658095A CN 200510024298 CN200510024298A CN1658095A CN 1658095 A CN1658095 A CN 1658095A CN 200510024298 CN200510024298 CN 200510024298 CN 200510024298 A CN200510024298 A CN 200510024298A CN 1658095 A CN1658095 A CN 1658095A
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Abstract
A field-moving space cooling atom clock applied to the upper air frequency standard, including an atom capturing cavity with atom source, a vacuum guide tube, a microwave resonant cavity, a magnetic shield, a thermostatic cover, a solenoidal coil, a detecting cavity, a vacuum bump system, a computer, a microwave generator, a laser system and a bracket. The characteristics are: adopt a movable microwave resonant cavity to complete the atom selection and the mutual function of the atom and the microwave. This invention can eliminate the end-to-end phasic error brought by the resonant cavity, simplifies the structure and improve the precision of the cooling atom clock.
Description
Technical field
The present invention relates to atomic clock, particularly a kind of field-displacement space cold-vapour atomic clock.
Background technology
At present, frequency standard-atomic clock of using in the space of countries in the world still is pyrogen secondary clocks such as traditional hydrogen clock, caesium clock, rubidium clock.Have only minority developed countries such as France, the U.S. to be developed into the space cold atomic clock of oneself, under space environment, the influence of magnetic field and gravity is almost 0, will have than the higher degree of accuracy of ground fountain clock, estimates to reach 10
-17Magnitude.Ground fountain cold atomic clock is under the effect of gravity, utilizes gravity to realize twice interaction of microwave field and atom, under the space microgravity environment, just can not utilize gravity to realize.In order to realize twice interaction of atom and microwave field, at present the space cold atomic clock of external development all be to use two microwave cavities realize twice interactional, cold atom group passes through two microwave cavities along a direction, so just has the end-end phase differential of microwave cavity.
Space cold atomic clock PARCS (the European Frequency and Time Forum of the present U.S., 1999 andthe IEEE International Frequency Control Symposium, 1999., Proceedings of the 1999Joint Meeting of the, Volume:1,13-16 April 1999, document PARCS:A PRIMARYATOMIC REFERENCE CLOCK IN SPACE) implementation as shown in Figure 1, produce nine bundle laser by laser system 10, wherein six bundle laser form three pairs of orthogonal laser by second optical fibre set 10.2 in atom seizure chamber 1, laser beam guides the left end that is connected on atom seizure chamber 1 by first optical fiber 10.1, and two bundle laser form the detection light path by the upper end that 10.3 guiding of the 3rd optical fibre set are connected on detection cavity 6.Atom seizure chamber 1 connects atomic source 11, and the right-hand member of detection cavity 6 meets vacuum pump system 7.Atom seizure chamber 1 is connected with an end of state selection microwave cavity 3.1, and the other end of this state selection microwave cavity 3.1 is connected with the Ramsey microwave cavity 3 of two series connection, and the other end of these two Ramsey microwave resonance resonator cavitys 3 is connected with detection cavity 6.Its whole connection procedure all connects by vacuum pipeline 2.The Ramsey microwave cavity 3 of two series connection is in solenoid coil 5 inside, and solenoid coil 5 is again in the inside of magnetic shielding and constant temperature sleeve 4.Microwave generator 9 is presented microwave signal by microwave line 9.1 to state selection microwave cavity 3.1, presents microwave signal by microwave line 9.2 to two Ramsey microwave cavities 3.The course of work is: caught atom and the atom of catching is cooled to 1～3 * 10 by three pairs of orthogonal laser of second optical fibre set, 10.2 guiding in atom seizure chamber 1
-6The K temperature, the laser frequency that changes three pairs of orthogonal laser produces mobile optical viscose glue (moving molasses), utilize this mobile optical viscose glue drive described atom together horizontal direction move right, make atom accelerate to certain initial velocity, turn off the optics viscose glue then, atom is freely flied at a constant speed along its initial velocity direction, 3.1 pairs of described atoms of described state selection microwave cavity carry out state selection, then, arrive detection cavity 6 at last by the Ramsey microwave cavity 3 of two series connection.Transition situation at 6 pairs of atoms of detection cavity is surveyed with photoelectric tube, result of detection is passed to computing machine 8 by input signal cable 8.1 to be handled, the result of computing machine 8 feeds back to microwave generator 9 by first output signal line 8.2, microwave generator 9 is adjusted according to the signal of first output signal line 8.2, makes microwave signal frequency and the described atomic resonance of sending into state selection microwave cavity 3.1 and two Ramsey microwave cavities 3.Thus we as can be seen, in the cold atomic clock of space, add state selection microwave cavity 3.1 1 shared 3 microwave cavities.Secondly, because there is different microwave cavity end end phase differential Φ in two Ramsey microwave cavities 3
1And Φ
2, by causing total phase differential Φ=Φ of end end after two Ramsey microwave cavities 3
1+ Φ
2
Wang Yu bamboo academician has proposed a kind of basic thought of field-displacement space cold-vapour atomic clock: use a mobile microwave resonator cavity to finish atom state selection and microwave and twice interaction of atom, to be same microwave cavity from two different directions and atom meet finishes twice interaction, and the end end phase differential of microwave cavity is Φ
0, interacting has for the first time caused Φ
0Phase differential, interacting has for the second time in the other direction caused-Φ
0Phase differential, so end-end phase differential that microwave cavity causes, can be eliminated in total phase differential Φ=0 therefore.
Summary of the invention
The present invention adopts the basic thought of field-displacement space cold-vapour atomic clock, proposes a kind of field-displacement space cold-vapour atomic clock structure, with simplified structure, eliminate end-end phase differential that microwave cavity causes, and the precision of raising space cold atomic clock.
The technical scheme of field-displacement space cold-vapour atomic clock of the present invention is as follows:
A kind of field-displacement space cold-vapour atomic clock as the high spatial frequency standard, comprise that one has atom seizure chamber, vacuum pipeline, microwave cavity, magnetic shielding and constant temperature sleeve, solenoid coil, detection cavity, vacuum pump system, computing machine, microwave generator, laser system and the support of atomic source, one end of described vacuum pipeline is connected with described atom seizure chamber, the other end is connected with described detection cavity, and described detection cavity is connected with described vacuum pump system; Described laser system produces nine bundle laser, wherein a branch of by the left end window of first fiber guides to described atom seizure chamber, restraint the laser beam that laser aiming to six windows in this atom seizure chamber form three pairs of quadratures by second optical fibre set with six, all the other two bundle laser aimings are extremely formed the detection light path in the upper end of described detection cavity by the 3rd optical fibre set; Described input end and computer mouth links to each other with photoelectric tube in the described detection cavity by input signal cable, its first output port links to each other with the control end of microwave generator by output signal line, the output of this microwave generator links to each other with described microwave cavity by microwave line, it is characterized in that: described microwave cavity is unique and drive system is housed, the middle shaft through-hole of this microwave cavity is enclosed within on the described vacuum pipeline, and vacuum pipeline is made controlled motion in the driving lower edge of its drive system; Described drive system comprises a ball screw, cover is joined a feed screw nut on this ball screw, this feed screw nut is fixedlyed connected with described microwave cavity, described ball screw by two ball bearing and described vacuum pipeline abreast frame be contained on the described support, one end of this ball screw links to each other by the rotating shaft of shaft coupling with an AC servo motor, and second output port of described computing machine links to each other with described AC servo motor by control line; Described vacuum pipeline, microwave cavity and ball wire bridge are contained in the inside of described magnetic shielding and constant temperature sleeve and solenoid coil.
Described vacuum pipeline is that the titanium conduit by the grass tube at middle part and two ends is sintered into one, its left end and first flange weld together, its right-hand member forms dismountable being tightly connected by a sealing ring and second flange, left end forms by first flange and atom seizure chamber and is tightly connected, and right-hand member is tightly connected by the 3rd flange formation of second flange and detection cavity.
Technique effect of the present invention:
Compared with prior art, because the present invention uses a mobile microwave resonator cavity to finish atom state selection and microwave and twice interaction of atom, to be same microwave cavity from two different directions and atom meet finishes twice interaction, and the end end phase differential of microwave cavity is Φ
0, interacting has for the first time caused Φ
0Phase differential, interacting has for the second time in the other direction caused-Φ
0Phase differential, so end-end phase differential that microwave cavity causes, can be eliminated in total phase differential Φ=0 therefore, simplified structure also improves the precision of space cold atomic clock.
Description of drawings
Fig. 1 is the structural representation of existing space cold atomic clock
Fig. 2 is the structural representation of field-displacement space cold-vapour atomic clock of the present invention
Fig. 3 is the vacuum system synoptic diagram of field-displacement space cold-vapour atomic clock of the present invention
Fig. 4 is the vacuum pipeline synoptic diagram of field-displacement space cold-vapour atomic clock of the present invention
Fig. 5 is the drive system synoptic diagram of field-displacement space cold-vapour atomic clock of the present invention
Fig. 6 is a Ramsey spectrum of field-displacement space cold-vapour atomic clock of the present invention
Embodiment
See also Fig. 2, Fig. 3 and Fig. 4 earlier, as seen from the figure, the structure of field-displacement space cold-vapour atomic clock of the present invention, comprise that one has atom seizure chamber 1, vacuum pipeline 2, microwave cavity 3, magnetic shielding and constant temperature sleeve 4, solenoid coil 5, detection cavity 6, vacuum pump system 7, computing machine 8, microwave generator 9, laser system 10 and the support 14 of atomic source 11, one end of described vacuum pipeline 2 is connected with described atom seizure chamber 1, the other end is connected with described detection cavity 6, and described detection cavity 6 is connected with described vacuum pump system 7; Described laser system 10 produces nine bundle laser, wherein a branch of left end window that guides to described atom seizure chamber 1 by first optical fiber 10.1, restraint the laser beam that laser aiming to six windows in this atom seizure chamber 1 form three pairs of quadratures by second optical fibre set 10.2 with six, all the other two bundle laser aimings are extremely formed the detection light path in the upper end of described detection cavity 6 by the 3rd optical fibre set 10.3; The input port of described computing machine 8 links to each other with photoelectric tube in the described detection cavity 6 by input signal cable 8.1, its first output port links to each other with the control end of microwave generator 9 by output signal line 8.2, the output of this microwave generator 9 links to each other with described microwave cavity 3 by microwave line 9.1, be characterized in: described microwave cavity 3 is unique and drive system 12 is housed, the middle shaft through-hole of this microwave cavity 3 is enclosed within on the described vacuum pipeline 2, makes controlled motion at the driving lower edge of its drive system 12 vacuum pipeline 2; Described drive system 12, referring to Fig. 5, comprise a ball screw 12.3, cover is joined a feed screw nut 12.2 on this ball screw 12.3, this feed screw nut 12.2 is fixedlyed connected with described microwave cavity 3, described ball screw 12.3 by two ball bearing 12.1 and described vacuum pipeline 2 abreast frame be contained on the described support 14, one end of this ball screw 12.3 links to each other with the rotating shaft of an AC servo motor 12.5 by shaft coupling 12.4, and second output port of described computing machine 8 links to each other with described AC servo motor 12.5 by control line 8.3; Described vacuum pipeline 2, microwave cavity 3 and 12.3 of ball screws are contained in the inside of described magnetic shielding and constant temperature sleeve 4 and solenoid coil 5.
Described vacuum pipeline 2, referring to Fig. 3, be to be sintered into one by the grass tube 2.1 at middle part and the titanium conduit 2.2 at two ends, its left end and first flange 2.3 weld together, its right-hand member forms dismountable being tightly connected by a sealing ring 2.5 and second flange 2.4, left end forms with atom seizure chamber 1 by first flange 2.3 and is tightly connected, and right-hand member is tightly connected by the 3rd flange 6.1 formation of second flange 2.4 with detection cavity 6.
Design philosophy of the present invention is described below:
The actuating medium of atomic clock is 87Rb or 133Cs normally.Because the collision deviation ratio caesium atom of rubidium atom is little 50 times, in this field-displacement space cold-vapour atomic clock, adopt the rubidium atom as actuating medium.Because this atomic clock operates in the space, the rigidity that needs low quality to become reconciled also requires nonmagneticly, therefore selects titanium metal material to make.The structure of field-displacement space cold-vapour atomic clock of the present invention mainly is made up of following part: vacuum system 13, drive system 12, support 14, magnetic shielding and constant temperature system cover 4, solenoid coil 5, laser system 10, microwave generator 9, computing machine 8 constitute.One-piece construction is seen Fig. 2.A specific embodiment of the present invention is a field-displacement space cold-vapour atom rubidium clock.
Field-displacement space cold-vapour atom rubidium clock is compared with PARCS space cold atomic clock, a state selection microwave cavity 3.1 and a Ramsey microwave cavity 3 have been reduced, only be a Ramsey microwave cavity 3, increased drive system 12, changed the assembly relation of Ramsey microwave cavity 3 simultaneously, the Ramsey microwave cavity 3 that is PARCS space cold atomic clock is as the vacuum wall use, and the Ramsey microwave cavity 3 of field-displacement space cold-vapour atomic clock is not used as vacuum wall, but passes Ramsey microwave cavity 3 by vacuum pipeline 2.Assembly relation between each parts is as follows: Fig. 3 is seen in the assembling of vacuum system 13, is connected to rubidium atomic source 11 on the atom seizure chamber 1, and vacuum pipeline 2 left sides connect atom seizure chamber 1, and the right connects detection cavity 6, and the right-hand member of detection cavity 6 meets vacuum pump system 7.First flange 2.3 at vacuum pipeline 2 two ends and the conduit 2.2 at second flange 2.4 and two ends are that titanium is made, vacuum pipeline 2 is glass tubes 2.1 at the center section of magnetic shielding and constant temperature sleeve 4 and solenoid coil 5 inside, glass tube 2.1 is in the same place with two ends titanium conduit 2.2 sintering, weld together between first flange 2.3 of the left end of vacuum pipeline 2 and the titanium conduit 2.2, second flange 2.4 of right-hand member links together by screw thread and titanium conduit 2.2, the sealing of this port is different from general flange seal, it is by the 3rd flange 6.1 of detection cavity 6 left ends and 2.5 seal ring seals between the titanium conduit 2.2, so both guaranteed when assembling, titanium conduit 2.2 and glass tube 2.1 are passed from Ramsey microwave cavity 3, also can reach vacuum-packed purpose, as shown in Figure 4.
The drive system 12 that drives Ramsey microwave cavity 3 is seen Fig. 5, by AC servo motor 12.5, and shaft coupling 12.4, ball screw 12.3, the feed screw nut 12.2, and ball bearing 12.1 is formed.Drive ball screw 12.3 driving feed screw nuts 12.2 by AC servo motor 12.5 by shaft coupling 12.4 and be with 3 motions of Ramsey microwave cavity, ball screw 12.3 two ends are supported on the support 14 with ball bearing 12.1.Quicken and retarded motion by secondary signal output line 8.3 control AC servo motor 12.5 by computing machine 8.
Referring to Fig. 2 and Fig. 5, AC servo motor 12.5 and ball screw 12.3 drive Ramsey microwave cavity 3 and move back and forth in solenoid coil 5.AC servo motor 12.5 and ball screw 12.3 are fixed on the base support 14, and ball screw 12.3 and vacuum pipeline 2 all pass magnetic shielding and constant temperature sleeve 4.Magnetic shielding and constant temperature sleeve 4 are fixed on the base support 14.Described Ramsey microwave cavity 3 is fixed in the solenoid coil 5 by support 14, vacuum pipeline 2 passes the axis aperture of Ramsey microwave cavity 3, Ramsey microwave cavity 3 is locked on the ball screw 12.3 by feed screw nut 12.2, and Ramsey microwave cavity 3 can move back and forth on vacuum pipeline 2 like this.Six bundle laser of laser system 10 are guided to three pairs of respective window of atom seizure chamber 1 quadrature by second optical fibre set 10.2, in atom seizure chamber 1, form three pairs of quadrature laser fields, from laser system 10 beam of laser is connected to the left end in atom seizure chamber 1 by first optical fiber 10.1.Laser system 10 is drawn two bundle laser by the 3rd optical fibre set 10.3 and is connected to detection cavity 6, forms the detection light path identical with the PARCS clock.Microwave generator 9 produces the microwave signal of 6.8GHz, and by coaxial soft microwave line 9.1, the aperture that passes on magnetic shielding and the constant temperature sleeve 4 is presented to Ramsey microwave cavity 3.Survey the atomic transition signal with photoelectric tube on the both sides, front and back of detection cavity 6, and pass to computing machine 8 by input signal cable 8.1, computing machine 8 is through handling, convert error signal to feedback signal and pass to microwave generator 9 by first output signal line 8.2,9 pairs of microwave signals of microwave generator are proofreaied and correct, and continue to present to Ramsey microwave cavity 3.
Field-displacement space cold-vapour atom rubidium clock of the present invention is compared with the PARCS clock, increased the drive system 12 of Ramsey microwave cavity 3 motions, outside so vacuum system 13 is different with the PARCS clock, has opened outside two holes more at magnetic shielding and constant temperature sleeve 4 two ends, difference above all has explanation, remaining solenoid coil 5, detection cavity 6, computing machine 8, microwave generator 9, laser system 10 etc. are all identical with the PARCS clock, are not described here, please see the relevant document of PARCS clock.
The course of work of field-displacement space cold-vapour atom rubidium clock is:
Field-displacement space cold-vapour atom rubidium clock is to allow Ramsey microwave cavity 3 move back and forth, make rubidium atomic group three times by same Ramsey microwave cavity 3, during for the first time by Ramsey microwave cavity 3, cold atom group is carried out state selection, interact with atomic group for all the other twice.During beginning, Ramsey microwave cavity 3 is still in the left end of magnetic shielding and constant temperature system cover 4 inside.Utilize laser-cooling technology in atom seizure chamber 1, to catch and cool off rubidium atomic cloud to 10
-5Below the K temperature, atom is in＜F=2, m
FAttitude.Make atomic cloud accelerate to speed v by mobile optical viscose glue technology
0, turn-offing laser, the cold atom along continuous straight runs is made uniform motion.When atom passes Ramsey microwave cavity 3 for the first time cold atom is carried out state selection,＜F=2, m
F=0〉the π counter-rotating takes place in the atom of attitude, forms laser pulse with the laser beam that is guided by first optical fiber 10.1 of atom seizure chamber 1 left end and removes＜F=2 m
F≠ 0〉atom of attitude stays and is in＜F=1 m
F=0〉atom of attitude.After this state selection cold atom passed Ramsey microwave cavity 3, this Ramsey microwave cavity 3 began to quicken to move right, and behind the arrival rate V, does horizontal uniform motion, catch up with this state selection cold atom then, takes place to interact for the first time with atom, makes to be in＜F=1 m
F=0〉the atom generation pi/2 of attitude counter-rotating.Because the speed V of Ramsey microwave cavity 3 is much larger than the speed v of state selection cold atom
0, therefore, stop behind the right-hand member of 3 arrival magnetic shieldings of Ramsey microwave cavity and constant temperature sleeve 4 inside, and static a period of time, do at the uniform velocity counter motion of level after oppositely accelerating to speed V then, then meet once more with this state selection cold atom, take place to interact for the second time, make to be in＜F=1 m
F=0〉counter-rotating of pi/2 takes place in the atom of attitude again, at this moment＜F=1, m
F=0〉the π counter-rotating has taken place and has been excited to＜F=2 m in the cold atom of attitude
F=0〉attitude.Arrive and stop behind the initial positions staticly Deng Ramsey microwave cavity 3, then begin the motion and the interaction of next cycle.Because V＞＞v
0So, can make the time interval T long enough of twice effect, again because T and being inversely proportional to relation of Ramsey line width, Ramsey live width that therefore further pressure is narrow.Because the translational speed of Ramsey microwave cavity 3 can be adjustable by drive system 12 controls, so the time interval T of two secondary actions is adjustable, so that the Ramsey line width can be regulated.
Theoretical analysis:
Different for field-displacement space cold-vapour atomic clock with the situation of PARCS clock, at first be to use a Ramsey microwave cavity 3 just can finish twice interaction of microwave field to state selection and the microwave field and the atom of atom.Secondly, twice interaction time of microwave field and atom is unequal, and PARCS clock microwave field equated with twice interaction time of atom.The atomic transition probability formula of field-displacement space cold-vapour atomic clock just is different from the transition probability formula in the PARCS clock like this.
It is as follows that the atomic transition probability formula of formula space atom rubidium clock is moved in the field:
Twice action time of state selection cold atom and microwave field is unequal, if make τ
1-ε=τ
2+ ε=τ, L are that Ramsey microwave cavity 3 chambeies are long, V and v
0Be respectively the speed of Ramsey microwave cavity 3 and state selection cold atom, then have
If during T=0, atom all is in energy level down, cold atom begins to pass through resonator cavity 3.After atom and twice interaction of microwave field, the transition probability of atom from initial following energy level transition to last energy level can draw by accurately finding the solution schrodinger equation:
In the formula:
cosθ＝(ω
0-ω)/a sinθ＝-Ω/a
a＝[(ω
0-ω)
2+Ω
2]
λ＝( ω
0-ω)
ω in the formula
0Represent the resonant frequency of atom respectively and add oscillating field frequency, ω with ω
0Expression atom and microwave field do not have the time average of the resonant frequency of interior atom of interactional T time, when not having the influencing of other stray magnetic fields, and ω
0=ω
0Ω represents atom and the interactional intensity of microwave field, and its definition is:
Here, E and H represent the electric field and the magnetic field amplitude of microwave field respectively, and P and μ represent corresponding electric dipole transition matrix element and magnetic dipole transition matrix element respectively.
The transition probability formula that atom has been arranged just can calculate the interactional Ramsey spectral line of atom and microwave field, obtains the live width of Ramsey spectral line.
We can know that field-displacement space cold-vapour atomic clock is different from the PARCS clock by top analysis, under space microgravity, field-displacement space cold-vapour atomic clock can enough single Ramsey microwave cavity 3 be realized twice interaction of microwave field to state selection and the microwave field and the atom of atom, eliminated the end that Ramsey microwave cavity 3 causes-end phase differential, the atomic clock precision is improved.At V=1m/s, v
0The amplitude B=5.15419 of=4cm/s, T=10s, microwave magnetic field magnetic induction density * 10
-10The temperature of T, cold atom is 10
-5During K, the central peak halfwidth of Ramsey spectral line is 0.3Hz.Ramsey spectral line such as Fig. 6.
Can know by above analysis, field-displacement space cold-vapour atomic clock is that than the advantage of PARCS clock field-displacement space cold-vapour atomic clock utilizes single Ramsey microwave cavity 3 to realize twice interaction of microwave field to state selection and the microwave field and the atom of atom, has also eliminated the end that Ramsey microwave cavity 3 causes-end phase differential.Secondly, twice interactional time interval T of microwave field and state selection cold atom can adjust flexibly by control cold atom speed of movement of cloud degree and Ramsey microwave cavity 3 translational speed V, can change the live width of Ramsey spectral line, thereby changes the precision of atomic clock.
Claims (2)
1, a kind of field-displacement space cold-vapour atomic clock as the high spatial frequency standard, comprise that one has the atom seizure chamber (1) of atomic source (11), vacuum pipeline (2), microwave cavity (3), magnetic shielding and constant temperature sleeve (4), solenoid coil (5), detection cavity (6), vacuum pump system (7), computing machine (8), microwave generator (9), laser system (10) and support (14), one end of described vacuum pipeline (2) is connected with described atom seizure chamber (1), the other end is connected with described detection cavity (6), and described detection cavity (6) is connected with described vacuum pump system (7); Described laser system (10) produces nine bundle laser, wherein a branch of left end window that guides to described atom seizure chamber (1) by first optical fiber (10.1), restraint the laser beam that laser aiming to six windows in this atom seizure chamber (1) form three pairs of quadratures by second optical fibre set (10.2) with six, all the other two bundle laser aimings are extremely formed the detection light path in the upper end of described detection cavity (6) by the 3rd optical fibre set (10.3); The input port of described computing machine (8) links to each other with photoelectric tube in the described detection cavity (6) by input signal cable (8.1), its first output port links to each other with the control end of microwave generator (9) by output signal line (8.2), the output of this microwave generator (9) links to each other with described microwave cavity (3) by microwave line (9.1), it is characterized in that: described microwave cavity (3) is unique and drive system (12) is housed, the middle shaft through-hole of this microwave cavity (3) is enclosed within on the described vacuum pipeline (2), makes controlled motion at the driving lower edge of its drive system (12) vacuum pipeline (2); Described drive system (12) comprises a ball screw (12.3), this ball screw (12.3) is gone up cover and is joined a feed screw nut (12.2), this feed screw nut (12.2) is fixedlyed connected with described microwave cavity (3), described ball screw (12.3) by two ball bearing (12.1) and described vacuum pipeline (2) abreast frame be contained on the described support (14), one end of this ball screw (12.3) links to each other with the rotating shaft of an AC servo motor (12.5) by shaft coupling (12.4), and second output port of described computing machine (8) links to each other with described AC servo motor (12.5) by control line (8.3); Described vacuum pipeline (2), microwave cavity (3) and ball screw (12.3) frame are contained in the inside of described magnetic shielding and constant temperature sleeve (4) and solenoid coil (5).
2, field-displacement space cold-vapour atomic clock according to claim 1, it is characterized in that described vacuum pipeline (2) is to be sintered into one by the grass tube (2.1) at middle part and the titanium conduit (2.2) at two ends, its left end and first flange (2.3) weld together, its right-hand member forms dismountable being tightly connected by a sealing ring (2.5) and second flange (2.4), left end forms with atom seizure chamber (1) by first flange (2.3) and is tightly connected, and right-hand member is tightly connected by the 3rd flange (6.1) formation of second flange (2.4) with detection cavity (6).
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2005
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