CN103152038B - A kind of passive Rb atom frequency marking servo-drive system and quantum frequency discrimination method - Google Patents
A kind of passive Rb atom frequency marking servo-drive system and quantum frequency discrimination method Download PDFInfo
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- CN103152038B CN103152038B CN201310039016.9A CN201310039016A CN103152038B CN 103152038 B CN103152038 B CN 103152038B CN 201310039016 A CN201310039016 A CN 201310039016A CN 103152038 B CN103152038 B CN 103152038B
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- 229910052701 rubidium Inorganic materials 0.000 title claims abstract description 25
- 238000012850 discrimination method Methods 0.000 title claims abstract description 14
- 230000001360 synchronised effect Effects 0.000 claims abstract description 63
- 239000013078 crystal Substances 0.000 claims description 9
- 230000005622 photoelectricity Effects 0.000 claims 2
- 230000003595 spectral effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical group [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005283 ground state Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
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Abstract
The invention belongs to Rb atom frequency marking technical field, be specifically related to a kind of passive Rb atom frequency marking servo-drive system and quantum frequency discrimination method. Rb atom frequency marking servo-drive system comprises microprocessor, VCXO, synchronous phase discriminator, microwave radio source, synthesizer, microwave cavity, photocell is housed in microwave cavity, the first photocell, second photocell of same model placed respectively at microwave cavity two ends, the first photocell sends quantum frequency discrimination signal to the first synchronous phase discriminator, the second photocell sends quantum frequency discrimination signal to the second synchronous phase discriminator, and the first synchronous phase discriminator, the second synchronous phase discriminator are connected with described microprocessor respectively. Setting a synchronous phase discriminator is main synchronous phase discriminator, and another is assist in synchronization phase discriminator; According to the main Δ W relatively trying to achieveMain-ΔVMainWith Δ WAuxiliary-ΔVAuxiliaryResult of calculation, judge whether to change the frequency of VCXO. The present invention can reduce the erroneous judgement for correction demand, completes more accurately the closed loop locking of Rb atom frequency marking servo-drive system.
Description
Technical field
The invention belongs to Rb atom frequency marking technical field, be specifically related to a kind of passive Rb atom frequency marking servoSystem and quantum frequency discrimination method.
Background technology
The core component of inactive type rubidium atom frequency scale Photoelectric Detection loop comprise physical system, comprehensive,Synchronous phase demodulation etc., due to the C field of microwave cavity in the physical system various factors inhomogeneousImpact causes atomic spectral line asymmetric, although the frequency of VCXO output through radio frequency frequency multiplication, comprehensive,The actual frequency obtaining after microwave multiple-frequency, mixing can accurately equal the crest frequency of spectral line in theory,But because actual atomic spectral line is asymmetric, the locating physical system output frequency discrimination signal through servo loopAfter reason, just have the fundametal compoment of modulating frequency in the correction voltage of output, this fundametal compoment is onePseudo error voltage, can make VCXO frequency draw partially. Thereby make through radio frequency frequency multiplication, comprehensive, microwave timesFrequently, the actual frequency that obtains after mixing can not equal the crest frequency of spectral line in theory, can existA frequency shift amount. For a concrete atomic frequency standard face speech, if the degree of depth of square wave frequency modulation remains unchanged,This frequency shift amount is also constant, still needs to provide different microwaves and inquire after frequency in the time of Servo System Designf1、f2Corresponding error output voltage V1、V2Concrete difference DELTA V, and using the value of Δ V as whole thingWhether reason system the basis for estimation of closed loop locking, and the value of Δ V judges by microprocessor stores and by it,The synchronous phase demodulation error signal Δ W that simultaneity factor at a time obtains synchronous phase demodulation work is passed toMicroprocessor, synchronous phase demodulation error signal Δ W and microwave are inquired after frequency f by microprocessor1、f2CorrespondingError output voltage V1、V2Difference DELTA V compare, in the time that Δ W is greater than Δ V, microprocessor willExport corresponding quantum deviation correcting signal and act on VCXO, make its output frequency value increase; Equally,In the time that Δ W is less than Δ V, corresponding output quantum deviation correcting signal is acted on VCXO by microprocessor,Its output frequency value is declined, finally make dynamically Δ W=Δ V. Jump at atomic ground state 0-0 exactly in additionThe figure that moves centre frequency fo place there will be the microwave of certain hole burning phenomenon microwave radio source output to visitAsking semaphore lock is that dynamic locking fixes near the frequency range of hole burning.
Summary of the invention
Technical problem to be solved by this invention is to provide one provides one can judge correction demand type energyAccurately complete Rb atom frequency marking servo-drive system closed loop locking inactive type rubidium atom frequency scale servo-drive system andQuantum frequency discrimination method.
For solving the problems of the technologies described above, technical scheme of the present invention is:
A kind of Rb atom frequency marking servo-drive system, comprise microprocessor, VCXO, synchronous phase discriminator,Microwave radio source, synthesizer, microwave cavity, be equipped with photocell in microwave cavity, described microwave cavity two ends are dividedDo not place the first photocell, second photocell of same model, described the first photocell sends quantum mirrorFrequently signal is given the first synchronous phase discriminator, and it is synchronous to second that described the second photocell sends quantum frequency discrimination signalPhase discriminator, the described first synchronous phase discriminator, the second synchronous phase discriminator are connected with described microprocessor respectively.
Preferably, described the first photocell and the second photocell are arranged on microwave cavity central axis symmetricallyBoth sides.
Preferably, described VCXO is high stability crystal oscillator.
A quantum frequency discrimination method for Rb atom frequency marking, starts respectively the first synchronous phase discriminator, second togetherStep phase discriminator, obtains corresponding frequency f by the first synchronous phase discriminator11、f21Locate corresponding magnitude of voltage V11、V12Obtain corresponding frequency f with the second synchronous phase discriminator12、f22Locate corresponding magnitude of voltage V21、V22StorageIn described microprocessor;
Setting one of them synchronous phase discriminator is main synchronous phase discriminator, and another is assist in synchronization phase demodulationDevice;
The synchronous phase demodulation error signal Δ W that main synchronous phase discriminator is obtainedMainBe passed to microprocessor, micro-placeReason device calculates Δ WMain-ΔVMain；
The synchronous phase demodulation error signal Δ W that auxiliary synchronous phase discriminator is obtainedAuxiliaryBe passed to microprocessor, micro-placeReason device calculates Δ WAuxiliary-ΔVAuxiliary 1；
According to the main Δ W relatively trying to achieveMainΔVMainWith Δ WAuxiliary-ΔVAuxiliaryResult of calculation, judge whether to changeBecome the frequency of VCXO.
Preferably, the quantum frequency discrimination method of Rb atom frequency marking, described synthesizer sends to described microwave and penetratesFrequently the modulation signal in source with send to described first synchronize phase discriminator the first synchronizing signal, send to instituteThe second synchronizing signal of stating the second synchronous phase discriminator is relevant San road signal. Can ensure synchronous phase demodulationSequential relationship.
Preferred, microprocessor is Δ W relativelyMain-ΔVMainWith Δ WAuxiliary-ΔVAuxiliary, as Δ WMain-ΔVMainBe greater than 0Δ W simultaneouslyAuxiliary-ΔVAuxiliaryBe less than at 0 o'clock, judgement does not change the frequency of VCXO; As Δ WMain-ΔVMainBe less than0 while Δ WAuxiliary-ΔVAuxiliaryBe greater than at 0 o'clock, judgement does not change the frequency of VCXO. Now system be due toThere is different correction demands in the interference of peripheral circuit.
Preferred, microprocessor is Δ W relativelyMain-ΔVMainWith Δ WAuxiliary-ΔVAuxiliary, as Δ WMain-ΔVMainBe 0, withTime Δ WAuxiliary-ΔVAuxiliaryBe not 0 o'clock, judgement does not change the frequency of VCXO. With to main synchronous phase demodulation mouldThe judgement of piece is as the criterion, the operation of not rectifying a deviation.
Preferred, microprocessor is Δ W relativelyMain-ΔVMainWith Δ WAuxiliary-ΔVAuxiliary, as Δ WMain-ΔVMainBe greater than 0Δ W simultaneouslyAuxiliary-ΔVAuxiliaryBe greater than at 0 o'clock, judgement changes the frequency of VCXO; As Δ WMain-ΔVMainBe less than 0Δ W simultaneouslyAuxiliary-ΔVAuxiliaryBe less than at 0 o'clock, judgement changes the frequency of VCXO. Now system is due to physicsComponents of system as directed reason needs correction.
Preferred, microprocessor is Δ W relativelyMain-ΔVMainWith Δ WAuxiliary-ΔVAuxiliary, as Δ WMain-ΔVMainBe not 0,And Δ WAuxiliary-ΔVAuxiliaryBe 0 o'clock, change the frequency of VCXO. With the judgement to main synchronous phase demodulation moduleBe as the criterion, the operation of rectifying a deviation.
The invention has the beneficial effects as follows it is can be by two synchronous phase discriminators and two photronic joiningClose, can reduce the erroneous judgement for correction demand, complete more accurately sooner whole Rb atom frequency marking and watchThe closed loop locking of dress system.
Brief description of the drawings
Fig. 1 is the schematic diagram of embodiment of the present invention Rb atom frequency marking servo-drive system.
Detailed description of the invention
A kind of Rb atom frequency marking servo-drive system, as shown in Figure 1, comprise microprocessor 7, high stability crystal oscillator 1,The first synchronous phase discriminator 61, the second synchronous phase discriminator 62, microwave radio source 2, synthesizer 4, microwaveChamber 3, microwave cavity 3 central axis are placed respectively the first photocell 51, second photocell of same model52, the first photocells 51 send quantum frequency discrimination signal to the first synchronous phase discriminator 61, the second photocells52 send quantum frequency discrimination signal to the synchronous phase discriminator of the second synchronous phase discriminator 62, the first 61, second togetherStep phase discriminator 62 is connected with microprocessor 7 respectively.
A quantum frequency discrimination method for Rb atom frequency marking, adopts Rb atom frequency marking as shown in Figure 1 servoSystem, starts first respectively the first synchronous phase discriminator 61, the second synchronous phase discriminator 62, completes wholeThe frequency sweep of physical system Atom absorption line, obtains corresponding frequency by the first synchronous phase discriminator 61f11、f21Locate corresponding magnitude of voltage V11、V12Obtain corresponding frequency f with the second synchronous phase discriminator 6212、f22Locate corresponding magnitude of voltage V21、V22Be stored in described microprocessor 7; Set the first synchronous phase demodulationDevice 61 is main synchronous phase discriminator, and the second synchronous phase discriminator 62 is assist in synchronization phase discriminator; To lead synchronousThe synchronous phase demodulation error signal that phase discriminator obtains is designated as Δ WMainAnd be passed to microprocessor 7, same by firstStep phase discriminator 61 obtains corresponding frequency f11、f21Locate corresponding magnitude of voltage V11、V12Difference is designated as Δ VIt is main,Microprocessor calculates Δ WMain-ΔVMain; The synchronous phase demodulation error signal note that auxiliary synchronous phase discriminator is obtainedFor Δ WAuxiliaryBe passed to microprocessor 7, the second synchronous phase discriminator 62 is obtained to corresponding frequency f12、f22Locate corresponding magnitude of voltage V21、V22Difference is designated as Δ VAuxiliary, microprocessor calculates Δ WAuxiliary-ΔVAuxiliary; According to thanThe main Δ W trying to achieveMainΔVMainWith Δ WAuxiliary-ΔVAuxiliaryResult of calculation, judge whether to change Gao WenjingShake 1 frequency, specific as follows:
Relatively Δ W of microprocessor 7Main-ΔVMainWith Δ WAuxiliary-ΔVAuxiliary, as Δ WMain-ΔVMainBe greater than 0 while Δ WAuxiliary-ΔVAuxiliaryBe less than at 0 o'clock, judgement does not change the frequency of high stability crystal oscillator 1; As Δ WMainΔVMainBe less than 0 simultaneouslyΔWAuxiliary-ΔVAuxiliaryBe greater than at 0 o'clock, judgement does not change the frequency of high stability crystal oscillator 1.
Relatively Δ W of microprocessor 7MainΔVMainWith Δ WAuxiliary-ΔVAuxiliary, as Δ WMain-ΔVMainBe 0, Δ W simultaneouslyAuxiliary-ΔVAuxiliaryBe not 0 o'clock, judgement does not change the frequency of high stability crystal oscillator 1.
Relatively Δ W of microprocessor 7Main-ΔVMainWith Δ WAuxiliary-ΔVAuxiliary, as Δ WMain-ΔVMainBe greater than 0 while Δ WAuxiliary-ΔVAuxiliaryBe greater than at 0 o'clock, judgement changes the frequency of high stability crystal oscillator 1; As Δ WMain-ΔVMainBe less than 0 while Δ WAuxiliary-ΔVAuxiliaryBe less than at 0 o'clock, judgement changes the frequency of high stability crystal oscillator 1.
Relatively Δ W of microprocessor 7Main-ΔVMainWith Δ WAuxiliaryΔVAuxiliary, as Δ WMain-ΔVMainBe not 0, and Δ WAuxiliary -ΔVAuxiliaryBe 0 o'clock, change the frequency of high stability crystal oscillator 1.
The modulation signal that synthesizer 4 sends to microwave radio source 2 with send to first and synchronize phase discriminatorThe first synchronizing signal of 61, the second synchronizing signal that sends to the second synchronous phase discriminator 62 are concerned withThree road signals.
It should be noted last that, above detailed description of the invention is only in order to illustrate technical side of the present inventionCase and unrestricted, although the present invention is had been described in detail with reference to preferred embodiment, this areaThose of ordinary skill should be appreciated that can technical scheme of the present invention be modified or is equal to and replacesChange, and do not depart from the spirit and scope of technical solution of the present invention, it all should be encompassed in power of the present inventionIn the middle of profit claimed range.
Claims (6)
1. a quantum frequency discrimination method for Rb atom frequency marking, comprises microprocessor, VCXO, synchronousPhase discriminator, microwave radio source, synthesizer, microwave cavity, auxiliary synchronous phase discriminator, be equipped with photoelectricity in microwave cavityPond, is characterized in that, the first photocell, second photoelectricity of same model is placed respectively at described microwave cavity two endsPond, described the first photocell sends quantum frequency discrimination signal to the first synchronous phase discriminator, described the second photoelectricityQuantum frequency discrimination signal is sent to the second synchronous phase discriminator in pond, the described first synchronous phase discriminator, second synchronousPhase discriminator is connected with described microprocessor respectively; Described the first photocell and the second photocell are pacified symmetricallyBe contained in the both sides of microwave cavity central axis; Described VCXO is high stability crystal oscillator;
It is characterized in that, start respectively the described first synchronous phase discriminator, the second synchronous phase discriminator, by describedOne synchronous phase discriminator obtains corresponding frequency f11、f21Locate corresponding magnitude of voltage V11、V12With described secondSynchronous phase discriminator obtains corresponding frequency f12、f22Locate corresponding magnitude of voltage V21、V22Be stored in described micro-In processor;
Setting one of them synchronous phase discriminator is main synchronous phase discriminator, and another is assist in synchronization phase discriminator;
The synchronous phase demodulation error signal Δ W that synchronous described master phase discriminator is obtainedMainBe passed to described micro-processingDevice, described microprocessor calculates Δ WMain-ΔVMain, described Δ VMainThe error that is main synchronous phase discriminator acquisition is defeatedGo out voltage;
The synchronous phase demodulation error signal Δ W that described auxiliary synchronous phase discriminator is obtainedAuxiliaryBe passed to described micro-processingDevice, described microprocessor calculates Δ WAuxiliary-ΔVAuxiliary, described Δ VAuxiliaryThe error that is auxiliary synchronous phase discriminator acquisition is defeatedGo out voltage;
According to the main Δ W relatively trying to achieveMain-ΔVMainWith Δ WAuxiliary-ΔVAuxiliaryResult of calculation, judge whether to changeBecome the frequency of described VCXO.
2. the quantum frequency discrimination method of Rb atom frequency marking according to claim 1, is characterized in that instituteState modulation signal that synthesizer sends to described microwave radio source and send to described first and synchronize phase discriminatorThe first synchronizing signal, the second synchronizing signal of sending to the described second synchronous phase discriminator be concerned with threeRoad signal.
3. the quantum frequency discrimination method of Rb atom frequency marking according to claim 1 and 2, its feature existsIn, described microprocessor is Δ W relativelyMain-ΔVMainWith Δ WAuxiliary-ΔVAuxiliary, as Δ WMain-ΔVMainBe greater than 0 while Δ WAuxiliary-ΔVAuxiliaryBe less than at 0 o'clock, judgement does not change the frequency of VCXO; As Δ WMain-ΔVMainBe less than 0 while Δ WAuxiliary-ΔVAuxiliaryBe greater than at 0 o'clock, judgement does not change the frequency of VCXO.
4. according to the quantum frequency discrimination method of Rb atom frequency marking described in claim 1 or 2, it is characterized in that,Described microprocessor is Δ W relativelyMain-ΔVMainWith Δ WAuxiliary-ΔVAuxiliary, as Δ WMain-ΔVMainBe 0, Δ W simultaneouslyAuxiliary-ΔVAuxiliaryBe not 0 o'clock, judgement does not change the frequency of VCXO.
5. according to the quantum frequency discrimination method of Rb atom frequency marking described in claim 1 or 2, it is characterized in that,Described microprocessor is Δ W relativelyMain-ΔVMainWith Δ WAuxiliary-ΔVAuxiliary, as Δ WMain-ΔVMainBe greater than 0 while Δ WAuxiliary-ΔVAuxiliaryBe greater than at 0 o'clock, judgement changes the frequency of described VCXO; As Δ WMain-ΔVMainBe less than 0 while Δ WAuxiliary-ΔVAuxiliaryBe less than at 0 o'clock, judgement changes the frequency of described VCXO.
6. according to the quantum frequency discrimination method of Rb atom frequency marking described in claim 1 or 2, it is characterized in that,Described microprocessor is Δ W relativelyMain-ΔVMainWith Δ WAuxiliary-ΔVAuxiliary, as Δ WMain-ΔVMainBe not 0, and Δ WAuxiliary-ΔVAuxiliaryBe 0 o'clock, change the frequency of described VCXO.
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| CN104300979B (en) * | 2014-10-23 | 2015-08-12 | 中国科学院武汉物理与数学研究所 | A kind of Rb atom frequency marking bubble control method and system frequently |
| CN105450226A (en) * | 2015-12-10 | 2016-03-30 | 江汉大学 | Atomic frequency standard servo control method and atomic frequency standard |
| CN105743499B (en) * | 2016-01-29 | 2018-08-07 | 江汉大学 | Atomic frequency standard with novel servo mode |
| CN105743500B (en) * | 2016-01-29 | 2018-08-07 | 江汉大学 | Passive-type atomic frequency standard |
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