CN205792525U - A kind of atomic frequency standard - Google Patents
A kind of atomic frequency standard Download PDFInfo
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- CN205792525U CN205792525U CN201521027829.7U CN201521027829U CN205792525U CN 205792525 U CN205792525 U CN 205792525U CN 201521027829 U CN201521027829 U CN 201521027829U CN 205792525 U CN205792525 U CN 205792525U
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Abstract
The utility model discloses a kind of atomic frequency standard, belong to field of atomic frequency standard.Described atomic frequency standard includes: VCXO, integration module, physical system, synchronization phase demodulation module and central processing unit, and described physical system includes the first light cell and the second light cell being symmetricly set in microwave cavity；Described VCXO a, it is provided that detectable signal；Described integration module electrically connects with described VCXO and described physical system simultaneously；Described synchronization phase demodulation module electrically connects with described integration module and described physical system simultaneously；Described central processing unit electrically connects with described synchronization phase demodulation module and described VCXO simultaneously；Central processing unit is rectified a deviation by judging the product of Δ V1 and Δ V2 to determine whether atomic frequency standard.
Description
Technical field
This utility model relates to field of atomic frequency standard, particularly to a kind of atomic frequency standard.
Background technology
For obtaining temporal frequency more stable in the Nature, people are by applying low-intensity magnetic field to atoms such as rubidium, caesium, hydrogen, make its atomic energy level be changed into excited state by ground state, utilize the ground state hyperfine structure 0-0 transition center frequency do not disturbed by external magnetic field as reference time frequency values.
In atomic frequency standard, the detectable signal of VCXO output processes through integration module and obtains microwave interrogation signals, and microwave interrogation signals includes two sidebands of f1, f2；Physical system carries out frequency discrimination to microwave interrogation signals, two frequency discrimination signal V1, V2 will be obtained, if V1 equal to V2, illustrate f1, f2 just at the atomic spectral line mid frequency fo left and right sides and just symmetry, now microwave interrogation signals targeted by atomic transition center frequency；And when V1 is not equal to V2, servo module produces correction voltage according to frequency discrimination signal and acts on VCXO, to adjust the output frequency of VCXO；By said structure unit, the output frequency of VCXO is locked in atomic transition center frequency the most at last.
During realizing this utility model, utility model people finds that prior art at least there is problems in that
Added by microwave cavity Atom in physical system, magnetic field may be by electronic circuit (VCXO, integration module, servo module etc.) impact, in microwave cavity, the resonant frequency of the atom at each position has difference, and the atomic spectral line of reality is the superposition of each several part atomic spectral line, atomic spectral line shape reflects the situation of Distribution of Magnetic Field in microwave cavity, in this case, atomic spectral line is owing to applying the uneven of magnetic field, asymmetric, there is distortion in the atomic spectral line that may result in reality, in the case of atomic spectral line distorts, when f1 and f2 is in the both sides of fo, two voltage V1 and V2 detected are unequal, that is, in the prior art, think alignment atomic transition center frequency fo time, i.e. during V1=V2, actually do not reflect center frequency value truly.Therefore, prior art cannot lock atomic transition center frequency accurately.
Utility model content
In order to solve problem of the prior art, this utility model embodiment provides a kind of atomic frequency standard.Described technical scheme is as follows:
This utility model embodiment additionally provides a kind of atomic frequency standard, described atomic frequency standard includes: VCXO, integration module, physical system, synchronization phase demodulation module and central processing unit, and described physical system includes the first light cell and the second light cell being symmetricly set in microwave cavity；
Described VCXO a, it is provided that detectable signal；
Described integration module electrically connects with described VCXO and described physical system simultaneously, and is modulated described detectable signal and is acted in described physical system by the detectable signal through ovennodulation；
Described synchronization phase demodulation module electrically connects with described integration module and described physical system simultaneously, and respectively obtains the first error signal Δ W1 corresponding with described first light cell and the second error signal Δ W2 corresponding with described second light cell by synchronizing phase discriminating technology；
Described central processing unit electrically connects with described synchronization phase demodulation module and described VCXO simultaneously；
Described synchronization phase demodulation module includes that the first synchronization phase demodulation unit and second synchronizes phase demodulation unit, and described first synchronizes phase demodulation unit electrically connects with described first light cell, and described second synchronizes phase demodulation unit electrically connects with described second light cell.
In a kind of implementation of this utility model embodiment, described first light cell and described second light cell are identical light cell.
In the another kind of implementation of this utility model embodiment, described first light cell and the second light cell are symmetrical about the axis of described microwave cavity.
In the another kind of implementation of this utility model embodiment, described physical system also includes: spectral lamp, the constant-current source, the integrated filtering resonance bubble being located in described microwave cavity and the coupling ring being located at described microwave cavity afterbody that electrically connect with described C field coil around the C field coil being located on described microwave cavity, described integrated filtering resonance bubble and described light cell are each provided in the light path of described spectral lamp, and described integrated filtering resonance bubble is between described spectral lamp and described light cell, described microwave cavity afterbody refers to the one end in described microwave cavity away from described spectral lamp.
In the another kind of implementation of this utility model embodiment, described first light cell and described second light cell are the silicon cell having the strongest ligh-induced effect at 800nm.
In the another kind of implementation of this utility model embodiment, described integration module includes isolated amplifier, radio frequency multiplier unit, microwave times mixing unit, microprocessor and frequency synthesizer, described microprocessor electrically connects with described synchronization phase demodulation module, described isolated amplifier and described frequency synthesizer respectively, described isolated amplifier electrically connects with described VCXO and described radio frequency multiplier unit respectively, and described microwave times mixing unit electrically connects with described radio frequency multiplier unit, described frequency synthesizer and described physical system respectively.
Wherein, described frequency synthesizer is direct digital frequency synthesizer.
The technical scheme that this utility model embodiment provides has the benefit that
In this utility model embodiment, physical system is provided with two light cells, we use the detectable signal of non-modulated to simulate the first atomic spectral line and the second atomic spectral line by the two light cell respectively, now, physical system is not affected by electronic circuit interference, and the atomic spectral line therefore simulated does not includes electronic circuit interference component.When correction, two sidebands using the detectable signal of modulation search respective value from the first atomic spectral line and the second atomic spectral line respectively, and calculate two voltage differences V11-V12 and V21-V22 respectively, and obtain corresponding first photronic first error signal Δ W1 and the second error signal Δ W2 now by frequency discrimination and synchronization phase demodulation simultaneously.Calculate Δ V1 and Δ V2, Δ V1=V11-V12-Δ W1, Δ V2=V21-V22-Δ W2 respectively, judge Δ V1, Δ V2 the most respectively, if they are plus or minus simultaneously, explanation system needs correction due to physical system partly cause, then central processing unit is by execution correction action；If central processing unit judges that Δ V1, Δ V2 mono-are positive one negative, illustrating that physical system is likely due to the interference of electronic circuit and occurs in that different correction demands, now, central processing unit will not carry out correction action；If it is determined that Δ V1 is 0, it is believed that the most whole atomic frequency standard is locked, correction operation will not be carried out；If it is determined that Δ V2 be 0, Δ V1 be not 0, it is believed that now and non-locking, correction action will be carried out.By operating the most accordingly in four kinds of above-mentioned situations, until Δ V1=0 realizes the closed loop locking of whole system, it is to avoid the impact that the magnetic field that electronic circuit produces locks for atomic frequency standard positive pole.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme in this utility model embodiment, in describing embodiment below, the required accompanying drawing used is briefly described, apparently, accompanying drawing in describing below is only embodiments more of the present utility model, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of the atomic frequency standard that this utility model embodiment provides；
Fig. 2 is the flow chart of the atomic frequency standard servo control method that this utility model embodiment provides.
Detailed description of the invention
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing, this utility model embodiment is described in further detail.
Fig. 1 is the structural representation of a kind of atomic frequency standard that this utility model embodiment provides, see Fig. 1, atomic frequency standard includes: VCXO 201, integration module 202, physical system 203, synchronization phase demodulation module 204 and central processing unit 205, physical system 203 includes the first light cell 231 and the second light cell 232 being symmetricly set in microwave cavity.
VCXO 201 a, it is provided that detectable signal.
Integration module 202 electrically connects with VCXO 201 and physical system 203 simultaneously, and is modulated detectable signal and is acted in physical system 203 by the detectable signal through ovennodulation.
Synchronize phase demodulation module 204 to electrically connect with integration module 202 and physical system 203 simultaneously, and respectively obtain the first error signal Δ W1 corresponding with the first light cell 231 and second error signal Δ W2 corresponding with the second light cell 232 by synchronizing phase discriminating technology.
Central processing unit 205 electrically connects with Tong Bu phase demodulation module 204 and VCXO 201 simultaneously, and search through magnitude of voltage V11 and V12 corresponding to two sidebands of detectable signal of ovennodulation in the first atomic spectral line graph, the second atomic spectral line graph is searched through magnitude of voltage V21 and V22 corresponding to two sidebands of detectable signal of ovennodulation；Calculate Δ V1 and Δ V2, Δ V1=V11-V12-Δ W1, Δ V2=V21-V22-Δ W2；When the product of Δ V1 and Δ V2 is timing, atomic frequency standard is rectified a deviation；When the product of Δ V1 and Δ V2 is not for, time negative, rectifying a deviation to atomic frequency standard；When the product of Δ V1 and Δ V2 is 0, and when Δ V1 is not 0, atomic frequency standard is rectified a deviation；When the product of Δ V1 and Δ V2 is 0, and when Δ V1 is 0, atomic frequency standard is not rectified a deviation.
In central processing unit 205, storage has the first atomic spectral line graph and the second atomic spectral line graph, first atomic spectral line graph and the second atomic spectral line graph are to act in physical system 203 by the detectable signal of non-modulated, obtained by sweep frequency technique matching, first atomic spectral line graph and the first light cell 231 are corresponding, and the second atomic spectral line graph and the second light cell 232 are corresponding.
Specifically, when physical system does not accesses atomic frequency standard, by inputting the detectable signal of non-modulated, then its output is detected, thus matching atomic spectral line graph, in physical system, magnetic field is not affected by the impact of electronic circuit in atomic frequency standard in the process, and the atomic spectral line graph precision that matching obtains is high.Wherein, the detectable signal of non-modulated can be by a frequency source input.Wherein, frequency sweep refers to that controlling frequency gradually changes within the specific limits.
Alternatively, central processing unit 205 for determine atomic frequency standard is rectified a deviation time, above-mentioned first error signal Δ W1 is input to the VCXO of atomic frequency standard.
This utility model embodiment is using the first error signal Δ W1 as main correction, and the second error signal Δ W2, as auxiliary signal, is used for judging whether that needs are rectified a deviation.
In this utility model embodiment, the first light cell 231 is identical light cell with the second light cell 232.Concrete first light cell 231 and the second light cell 232 be same model, with a batch of light cell.
In this utility model embodiment, the first light cell 231 and the second light cell 232 are symmetrical about the axis of microwave cavity.The intensity of the longitudinal component of microwave magnetic field is the strongest in coupling ring both sides, so descending the place that atomic resonance transition signal is the strongest on the cavity both sides of microwave cavity in working order, therefore the first light cell 231 and the second light cell 232 are symmetrically mounted at the both sides of central axis.The signal that so they obtain the strongest and can be consistent the amount situation frequently of reflection physical system.
In this utility model embodiment, physical system 203 also includes: spectral lamp, the constant-current source, the integrated filtering resonance bubble being located in microwave cavity and the coupling ring being located at microwave cavity afterbody that electrically connect with C field coil around the C field coil being located on microwave cavity, integrated filtering resonance bubble and light cell are each provided in the light path of spectral lamp, and integrated filtering resonance bubble is between spectral lamp and light cell, microwave cavity afterbody refers to the interior one end away from spectral lamp of microwave cavity.
Alternatively, the first light cell 231 and the second light cell 232 are the silicon cell having the strongest ligh-induced effect at 800nm, to improve the precision of light inspection.
In this utility model embodiment, synchronize phase demodulation module 204 and include that the first synchronization phase demodulation unit 241 and second synchronizes phase demodulation unit 242, first synchronizes phase demodulation unit 241 electrically connects with the first light cell 231, and second synchronizes phase demodulation unit 242 electrically connects with the second light cell 232.
In the another kind of implementation of this utility model embodiment, integration module 202 includes isolated amplifier 221, radio frequency multiplier unit 222, microwave times mixing unit 223, microprocessor 224 and frequency synthesizer 225, microprocessor 224 electrically connects with Tong Bu phase demodulation module 204, isolated amplifier 221 and frequency synthesizer 225 respectively, isolated amplifier 221 electrically connects with VCXO 201 and radio frequency multiplier unit 222 respectively, and microwave times mixing unit electrically connects with radio frequency multiplier unit 222, frequency synthesizer 225 and physical system 203 respectively.
Wherein, VCXO 201 exports detectable signal；Isolated amplifier 221 is for carrying out isolating and amplifying by the output frequency signal of VCXO 201；Microprocessor 224 and frequency synthesizer 225 are used for producing comprehensive modulated signal；The output signal of isolated amplifier 221 exports to microwave times mixing unit 223 through radio frequency multiplier unit 222, microwave times mixing unit 223 is for carrying out frequency multiplication and mixing to output signal and the comprehensive modulated signal of radio frequency multiplier unit 222 simultaneously, to produce the detectable signal through ovennodulation；Physical system 203, for the detectable signal through ovennodulation carries out frequency discrimination, produces frequency discrimination signal；Synchronize to carry out with reference signal after phase demodulation module 204 carries out frequency-selecting amplification to frequency discrimination signal Tong Bu phase demodulation, produce error signal.
Wherein, microprocessor 224 uses the output of isolated amplifier 221 as reference source, by serial communication mode to frequency synthesizer 225 transmission frequency synthetic instruction, microprocessor 224 directly send a road 79Hz keying FM signal to the keying frequency modulation pin of frequency synthesizer 225 simultaneously.Frequency synthesizer 225 receives the frequency synthesis instruction that microprocessor 224 is sent, it is output as reference source with radio frequency multiplier unit 222, producing the comprehensive modulated signal of the 5.3125MHz ± Δ f of direct digital synthesis technique, wherein the size of Δ f is determined by the concrete live width of atomic frequency standard physical system 203.The reference signal of the two-way 79Hz that microprocessor 224 also produces is respectively fed to the first synchronization phase demodulation unit 241 and second and synchronizes phase demodulation unit 242, is used for carrying out synchronizing phase demodulation.The 79Hz keying FM signal delivered in frequency synthesizer 225 that microprocessor 224 produces has same phase with the 79Hz reference signal delivering to Tong Bu phase demodulation module 204.
Wherein, frequency synthesizer 225 is direct digital frequency synthesizer.
Fig. 2 is the flow chart of a kind of atomic frequency standard servo control method that this utility model embodiment provides, and sees Fig. 2, and the method includes:
Step S11: act in physical system by the detectable signal of non-modulated, physical system includes the first light cell and the second light cell being symmetricly set in microwave cavity.
Step S12: simulate first atomic spectral line graph corresponding with the first light cell and second atomic spectral line graph corresponding with the second light cell by sweep frequency technique.
Specifically, when physical system does not accesses atomic frequency standard, by inputting the detectable signal of non-modulated, then its output is detected, thus matching atomic spectral line graph, in physical system, magnetic field is not affected by the impact of electronic circuit in atomic frequency standard in the process, and the atomic spectral line graph precision that matching obtains is high.Wherein, the detectable signal of non-modulated can be by a frequency source input.Wherein, frequency sweep refers to that controlling frequency gradually changes within the specific limits.
In this utility model embodiment, simulate first atomic spectral line graph corresponding with the first light cell and second atomic spectral line graph corresponding with the second light cell by sweep frequency technique, including:
The detectable signal controlling non-modulated carries out frequency sweep；
Gather first light cell output frequency discrimination signal the first voltage and with the first voltage detectable signal frequency values one to one, simulate the first atomic spectral line graph；Gather second light cell output frequency discrimination signal the second voltage and with the second voltage detectable signal frequency values one to one, simulate the second atomic spectral line graph.
Step S13: act in physical system by the detectable signal through ovennodulation, respectively obtains the first error signal Δ W1 corresponding with the first light cell and the second error signal Δ W2 corresponding with the second light cell by synchronizing phase discriminating technology.
In this utility model embodiment, respectively obtain the first error signal Δ W1 corresponding with the first light cell and the second error signal Δ W2 corresponding with the second light cell by synchronizing phase discriminating technology, including:
Obtaining the first frequency discrimination signal and the second frequency discrimination signal that physical system produces, the first frequency discrimination signal is exported by the first light cell, and the second frequency discrimination signal is exported by the second light cell；
First frequency discrimination signal is carried out Tong Bu phase demodulation with reference signal, obtains the first error signal Δ W1, the second frequency discrimination signal is carried out Tong Bu phase demodulation with reference signal, obtain the second error signal Δ W2.
Step S14: search through magnitude of voltage V11 and V12 corresponding to two sidebands of detectable signal of ovennodulation in the first atomic spectral line graph, searches through magnitude of voltage V21 and V22 corresponding to two sidebands of detectable signal of ovennodulation in the second atomic spectral line graph.
Specifically, include two sidebands f1, f2 through the detectable signal of ovennodulation, the magnitude of voltage of correspondence can be found at atomic spectral line.
Step S15: calculate Δ V1 and Δ V2, Δ V1=V11-V12-Δ W1, Δ V2=V21-V22-Δ W2.
Step S16: when the product of Δ V1 and Δ V2 is timing, atomic frequency standard is rectified a deviation；When the product of Δ V1 and Δ V2 is not for, time negative, rectifying a deviation to atomic frequency standard；When the product of Δ V1 and Δ V2 is 0, and when Δ V1 is not 0, atomic frequency standard is rectified a deviation；When the product of Δ V1 and Δ V2 is 0, and when Δ V1 is 0, atomic frequency standard is not rectified a deviation.
Alternatively, atomic frequency standard is carried out correction to include: above-mentioned first error signal Δ W1 is input to the VCXO of atomic frequency standard.
This utility model embodiment is using the first error signal Δ W1 as main correction, and the second error signal Δ W2, as auxiliary signal, is used for judging whether that needs are rectified a deviation.
One of ordinary skill in the art will appreciate that all or part of step realizing above-described embodiment can be completed by hardware, relevant hardware can also be instructed by program to complete, described program can be stored in a kind of computer-readable recording medium, storage medium mentioned above can be read only memory, disk or CD etc..
The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all within spirit of the present utility model and principle, any modification, equivalent substitution and improvement etc. made, within should be included in protection domain of the present utility model.
Claims (7)
1. an atomic frequency standard, it is characterised in that described atomic frequency standard includes: VCXO, integration module, physical system, synchronization phase demodulation module and central processing unit, described physical system includes the first light cell and the second light cell being symmetricly set in microwave cavity；
Described VCXO a, it is provided that detectable signal；
Described integration module electrically connects with described VCXO and described physical system simultaneously, and is modulated described detectable signal and is acted in described physical system by the detectable signal through ovennodulation；
Described synchronization phase demodulation module electrically connects with described integration module and described physical system simultaneously, and respectively obtains the first error signal Δ W1 corresponding with described first light cell and the second error signal Δ W2 corresponding with described second light cell by synchronizing phase discriminating technology；
Described central processing unit electrically connects with described synchronization phase demodulation module and described VCXO simultaneously；
Described synchronization phase demodulation module includes that the first synchronization phase demodulation unit and second synchronizes phase demodulation unit, and described first synchronizes phase demodulation unit electrically connects with described first light cell, and described second synchronizes phase demodulation unit electrically connects with described second light cell.
Atomic frequency standard the most according to claim 1, it is characterised in that described first light cell and described second light cell are identical light cell.
Atomic frequency standard the most according to claim 1, it is characterised in that described first light cell and the second light cell are symmetrical about the axis of described microwave cavity.
4. according to the atomic frequency standard described in any one of claim 1-3, it is characterized in that, described physical system also includes: spectral lamp, around the C field coil being located on described microwave cavity, the constant-current source electrically connected with described C field coil, the integrated filtering resonance bubble being located in described microwave cavity, and it is located at the coupling ring of described microwave cavity afterbody, described integrated filtering resonance bubble and described light cell are each provided in the light path of described spectral lamp, and described integrated filtering resonance bubble is between described spectral lamp and described light cell, described microwave cavity afterbody refers to the interior one end away from described spectral lamp of described microwave cavity.
5. according to the atomic frequency standard described in any one of claim 1-3, it is characterised in that described first light cell and described second light cell are the silicon cell having the strongest ligh-induced effect at 800nm.
6. according to the atomic frequency standard described in any one of claim 1-3, it is characterized in that, described integration module includes isolated amplifier, radio frequency multiplier unit, microwave times mixing unit, microprocessor and frequency synthesizer, described microprocessor electrically connects with described synchronization phase demodulation module, described isolated amplifier and described frequency synthesizer respectively, described isolated amplifier electrically connects with described VCXO and described radio frequency multiplier unit respectively, and described microwave times mixing unit electrically connects with described radio frequency multiplier unit, described frequency synthesizer and described physical system respectively.
Atomic frequency standard the most according to claim 6, it is characterised in that described frequency synthesizer is direct digital frequency synthesizer.
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| CN201521027829.7U CN205792525U (en) | 2015-12-10 | 2015-12-10 | A kind of atomic frequency standard |
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| CN201521027829.7U CN205792525U (en) | 2015-12-10 | 2015-12-10 | A kind of atomic frequency standard |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112731788A (en) * | 2021-01-08 | 2021-04-30 | 江汉大学 | Satellite-borne clock system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112731788A (en) * | 2021-01-08 | 2021-04-30 | 江汉大学 | Satellite-borne clock system |
| CN112731788B (en) * | 2021-01-08 | 2024-05-28 | 江汉大学 | Satellite-borne clock system |
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Granted publication date: 20161207 Termination date: 20191210 |