CN105743500B - Passive-type atomic frequency standard - Google Patents
Passive-type atomic frequency standard Download PDFInfo
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- CN105743500B CN105743500B CN201610066062.1A CN201610066062A CN105743500B CN 105743500 B CN105743500 B CN 105743500B CN 201610066062 A CN201610066062 A CN 201610066062A CN 105743500 B CN105743500 B CN 105743500B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/26—Automatic control of frequency or phase; Synchronisation using energy levels of molecules, atoms, or subatomic particles as a frequency reference
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Abstract
The invention discloses a kind of passive-type atomic frequency standards, belong to field of atomic frequency standard.The passive-type atomic frequency standard includes：Voltage controlled crystal oscillator, microwave generation module, physical module, phase demodulation module and compensating module, the microwave generation module respectively with the voltage controlled crystal oscillator, the physical module and phase demodulation module electrical connection, the phase demodulation module is also electrically connected with the physical module and the compensating module, the compensating module is also electrically connected with the voltage controlled crystal oscillator, the physical module includes microwave cavity, being arranged side by side in the microwave cavity has the first chamber bubble and the second chamber bubble, the microwave cavity tail portion is additionally provided with the first photocell, second photocell and third photocell, first photocell and second photocell are arranged side by side, and the central axes that first photocell and second photocell are steeped about first chamber are symmetrical, the third photocell is on the central axes of the second chamber bubble.
Description
Technical field
The present invention relates to field of atomic frequency standard, more particularly to a kind of passive-type atomic frequency standard.
Background technology
For the temporal frequency for obtaining more stable in the Nature, people by applying low-intensity magnetic field to atoms such as rubidium, caesium, hydrogen,
Its atomic energy level is set to be changed into excitation state by ground state, using in the ground state hyperfine structure 0-0 transition that do not interfered by external magnetic field
Frequency of heart is as reference time frequency values.
In atomic frequency standard, the detectable signal of voltage controlled crystal oscillator output handles to obtain microwave by microwave generation module inquires after letter
Number, microwave interrogation signals include two sidebands of f1, f2；Physical module carries out frequency discrimination to microwave interrogation signals, it will obtains two
Frequency discrimination signal V1, V2 illustrates f1, f2 just at left and right sides of atomic spectral line centre frequency fo and just if V1 is equal to V2
Symmetrically, microwave interrogation signals are targeted by atomic transition center frequency at this time；And when V1 is not equal to V2, servo module is according to frequency discrimination
Signal generates correction voltage and acts on voltage controlled crystal oscillator, to adjust the output frequency of voltage controlled crystal oscillator；By above structure unit, finally
The output frequency of voltage controlled crystal oscillator is locked in atomic transition center frequency.
In the implementation of the present invention, the inventor finds that the existing technology has at least the following problems：
Since physical module may be by electronic circuit (voltage controlled crystal oscillator, microwave generation module, servo module etc.), environmental factor
(temperature, humidity) influences, and the resonant frequency of the atom at each position has difference in microwave cavity, and actual atomic spectral line is each
The case where superposition of part of atoms spectral line, atomic spectral line shape reflects Distribution of Magnetic Field in microwave cavity, in this case, atom
Spectral line may result in actual atomic spectral line and distort, distort in atomic spectral line due to applying the uneven, asymmetric of magnetic field
In the case of, when f1 and f2 is in the both sides of fo, two voltages V1 and V2 detecting are unequal, that is to say, that
In the prior art, it is believed that when alignment atomic transition center frequency fo, i.e. when V1=V2, actually truly reflect center
Frequency values.Therefore, the prior art can not accurately lock atomic transition center frequency.
Invention content
In order to solve problems in the prior art, an embodiment of the present invention provides a kind of passive-type atomic frequency standards.The technology
Scheme is as follows：
The embodiment of the present invention additionally provides a kind of passive-type atomic frequency standard, and the passive-type atomic frequency standard includes：Voltage-controlled crystalline substance
Shake, microwave generation module, physical module, phase demodulation module and compensating module, the microwave generation module respectively with the voltage-controlled crystalline substance
Shake, the physical module and the phase demodulation module electrical connection, the phase demodulation module also with the physical module and the compensation mould
Block is electrically connected, and the compensating module is also electrically connected with the voltage controlled crystal oscillator, and the physical module includes microwave cavity, the microwave cavity
It is interior be arranged side by side have the first chamber bubble and the second chamber bubble, the microwave cavity tail portion be additionally provided with the first photocell, the second photocell and
Third photocell, first photocell and second photocell are arranged side by side, and first photocell and described second
Photocell is symmetrical about the central axes that first chamber steeps, and the third photocell is on the central axes of the second chamber bubble；
The voltage controlled crystal oscillator, for providing a detectable signal；
The microwave generation module, for being modulated to the detectable signal and acting on the detectable signal through ovennodulation
In on the physical module；
The phase demodulation module respectively obtains the first mistake corresponding with first photocell for passing through synchronous phase discriminating technology
The difference signal Δ W1 and corresponding second error signal Δ W2 of second photocell and third corresponding with the third photocell
Error signal Δ W3；
The compensating module, for judging whether to need to the quilt according to the Δ W1, the Δ W2 and the Δ W3
Ejector half atomic frequency standard is rectified a deviation；When needing to rectify a deviation to the passive-type atomic frequency standard, using the Δ W1, the Δ
The mean value of any two, Huo Zhesuo in any of W2 and the Δ W3 or the Δ W1, the Δ W2 and the Δ W3
The mean value for stating Δ W1, the Δ W2 and the Δ W3 rectifies a deviation to the passive-type atomic frequency standard；
Wherein, the physical module further includes metal partion (metp), and the metal partion (metp) setting is in first chamber bubble and second
Between chamber bubble；
The phase demodulation module synchronizes phase demodulation unit, the second synchronization phase demodulation unit phase demodulation unit synchronous with third including first,
The first synchronization phase demodulation unit is electrically connected with first photocell, and described second synchronizes phase demodulation unit and second photoelectricity
Pond is electrically connected, and the third synchronizes phase demodulation unit and is electrically connected with the third photocell；
The microwave generation module include isolated amplifier, radio frequency multiplier unit, microwave times mixing unit, microprocessor and
Frequency synthesizer, the microprocessor are electrically connected with the phase demodulation module, the isolated amplifier and the frequency synthesizer respectively
It connects, the isolated amplifier is electrically connected with the voltage controlled crystal oscillator and the radio frequency multiplier unit respectively, and the microwave is mixed list again
Member is electrically connected with the radio frequency multiplier unit, the frequency synthesizer and the physical module respectively；
The microprocessor be used for using the isolated amplifier output be used as refer to source, by serial communication mode to
The frequency synthesizer transmission frequency synthetic instruction, while the microprocessor is for the keying directly to the frequency synthesizer
Frequency modulation pin send 79Hz keyings FM signal all the way；The frequency synthesizer is used to receive the frequency that the microprocessor is sent and closes
At instruction, using the output of the radio frequency multiplier unit as reference source, the 5.3125MHz ± Δs f of direct digital synthesis technique is generated
Synthesis modulated signal, the size of Δ f determines by the line width of the physical module；The microprocessor is additionally operable to generate three tunnels
It is synchronous with the third that the reference signal of 79Hz is respectively fed to the first synchronization phase demodulation unit, the second synchronization phase demodulation unit
Phase demodulation unit, synchronizes phase demodulation；What the microprocessor generated send to the 79Hz keying frequency modulation letter in the frequency synthesizer
Number with send to the phase demodulation module 79Hz reference signals have same phase.
In an implementation of the embodiment of the present invention, the physical module further includes spectrum lamp, coupling ring, C field wires
Circle, constant temperature unit and magnetic cup, the microwave cavity are arranged in the light path of the spectrum lamp, and the coupling ring is arranged in the microwave
In chamber, the C field coils, the constant temperature unit and the magnetic cup are disposed around the periphery of the microwave cavity successively.
In another realization method of the embodiment of the present invention, the first chamber bubble and second chamber bubble are integrated filtering
Resonance bubble.
In another realization method of the embodiment of the present invention, the microwave cavity is the microwave cavity of TE111 patterns.
In another realization method of the embodiment of the present invention, first photocell, second photocell and described
Third photocell is identical photocell.
In another realization method of the embodiment of the present invention, first photocell, second photocell and described
Third photocell is the silicon photocell for having in 800nm most strong ligh-induced effect.
In another realization method of the embodiment of the present invention, the compensating module is central processor core.
The advantageous effect that technical solution provided in an embodiment of the present invention is brought is：
In embodiments of the present invention, by the way that there are two chambers to steep for setting in physical module, and a chamber bubble corresponds to wherein
Two photocells are set, to obtain 3 quantum frequency discrimination signals, three groups of synchronization phase demodulations are completed, according to three groups of synchronization identified results
It rectifies a deviation, avoids the therefore influence for atom frequency standard locking of electronic circuit and environment.
Description of the drawings
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, other are can also be obtained according to these attached drawings
Attached drawing.
Fig. 1 is the structural schematic diagram of passive-type atomic frequency standard provided in an embodiment of the present invention；
Fig. 2 is the structural schematic diagram of physical module provided in an embodiment of the present invention.
Specific implementation mode
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
Fig. 1 is a kind of structural representation of passive-type atomic frequency standard (hereinafter atomic frequency standard) provided in an embodiment of the present invention
Figure, referring to Fig. 1, atomic frequency standard includes：Voltage controlled crystal oscillator 101, microwave generation module 102, physical module 103,104 and of phase demodulation module
Compensating module 105, physical module 103 include microwave cavity 131, and being arranged side by side in microwave cavity 131 has the first chamber bubble 13A and the second chamber
13B is steeped, 131 tail portion of microwave cavity is additionally provided with the first photocell 13a, the second photocell 13b and third photocell 13c, the first light
Battery 13a and the second photocell 13b is arranged side by side, and the first photocell 13a and the second photocell 13b steeps 13A about the first chamber
Central axes it is symmetrical, third photocell 13c be in the second chamber bubble 13B central axes on；
Voltage controlled crystal oscillator 101, for providing a detectable signal.
Microwave generation module 102, for being modulated to detectable signal and the detectable signal through ovennodulation being acted on object
It manages in module 103.
Phase demodulation module 104, for respectively obtaining the first error corresponding with the first photocell 13a by synchronous phase discriminating technology
The corresponding second error signal Δ W2 of signal delta W1 and the second photocell 132b and third error corresponding with third photocell letter
Number Δ W3.
Compensating module 105, for judging whether to need to rectify a deviation to atomic frequency standard according to Δ W1, Δ W2 and Δ W3；When
When needing to rectify a deviation to atomic frequency standard, using in any of Δ W1, Δ W2 and Δ W3 or Δ W1, Δ W2 and Δ W3
The mean value of any two or the mean value of Δ W1, Δ W2 and Δ W3, rectify a deviation to atomic frequency standard.
Referring to Fig. 2, physical module 103 further include spectrum lamp 132, coupling ring 133, C field coils 134, constant temperature unit 135,
Magnetic cup 136 and metal partion (metp) 137, microwave cavity 131 are arranged in the light path of spectrum lamp 132, and coupling ring 133 is arranged in microwave cavity
In 131, the setting of metal partion (metp) 137 is steeped in the first chamber between 13A and the second chamber bubble 13B, C field coils 134,135 and of constant temperature unit
Magnetic cup 136 is disposed around the periphery of microwave cavity successively.First chamber steeps 13A and the second chamber bubble 13B and photocell (three) is each provided at light
In the light path for composing lamp 132, and the first chamber bubble 13A and the second chamber steep 13B between spectrum lamp 131 and photocell, photocell position
In chamber bubble (two chamber bubbles) between coupling ring 133.Microwave cavity tail portion refers to one end far from spectrum lamp in microwave cavity above.
Wherein, the first chamber bubble 13A and the second chamber bubble 13B is integrated filtering resonance bubble.
In embodiments of the present invention, the first photocell 13a and the second photocell 132b steeps the central axes of 13A about the first chamber
Symmetrically.The intensity of the longitudinal component of microwave magnetic field is most strong in coupling ring both sides, so atomic resonance transition is believed in the operating condition
First photocell 13a and the second photocell 132b are symmetrically mounted at by number strongest place on the cavity both sides of microwave cavity
The both sides of central axis.The signal that they are obtained in this way it is most strong and can be consistent reflection physical module amount frequency situation.
In embodiments of the present invention, microwave cavity 131 is the microwave cavity of TE111 patterns.
In embodiments of the present invention, the first photocell 13a, the second photocell 132b and third photocell 13c are identical
Photocell.Specific first photocell 13a, the second photocell 132b and third photocell 13c are same model, with a batch of light
Battery.
Wherein, the first photocell 13a, the second photocell 132b and third photocell 13c are to have most strong photosensitive effect in 800nm
The silicon photocell answered, to improve the precision of light inspection.
Further, other than 131 periphery of microwave cavity is equipped with constant temperature unit 135,132 periphery of spectrum lamp also is provided with constant temperature list
Member 135.
In embodiments of the present invention, phase demodulation module 104 includes that the first synchronization phase demodulation unit 141, second synchronizes phase demodulation unit
142 phase demodulation units synchronous with third 143, the first synchronization phase demodulation unit 141 are electrically connected with the first photocell 13a, and second synchronizes mirror
Phase element 142 is electrically connected with the second photocell 132b, and third synchronizes phase demodulation unit 143 and is electrically connected with third photocell 13c.
In another realization method of the embodiment of the present invention, microwave generation module 102 includes isolated amplifier 121, penetrates
Frequency multiplier unit 122, microwave times mixing unit 123, microprocessor 124 and frequency synthesizer 125, microprocessor 124 respectively with
Phase demodulation module 104, isolated amplifier 121 and frequency synthesizer 125 are electrically connected, isolated amplifier 121 respectively with voltage controlled crystal oscillator 101
With radio frequency multiplier unit 122 be electrically connected, microwave times mixing unit respectively with radio frequency multiplier unit 122, frequency synthesizer 125 and object
Module 103 is managed to be electrically connected.
Wherein, voltage controlled crystal oscillator 101 exports detectable signal；Isolated amplifier 121 is used for the output frequency of voltage controlled crystal oscillator 101
Signal is isolated and is amplified；Microprocessor 124 and frequency synthesizer 125 are for generating comprehensive modulated signal；Isolated amplifier
121 output signal is exported by radio frequency multiplier unit 122 to microwave times mixing unit 123, and microwave times mixing unit 123 is used for
Output signal and comprehensive modulated signal to radio frequency multiplier unit 122 are carried out at the same time frequency multiplication and mixing, to generate through ovennodulation
Detectable signal；Physical module 103 is used to carry out frequency discrimination to the detectable signal through ovennodulation, generates frequency discrimination signal；Phase demodulation module 104
To synchronizing phase demodulation with reference signal after frequency discrimination signal progress frequency-selecting amplification, error signal is generated.
Wherein, microprocessor 124 using isolated amplifier 121 output be used as refer to source, by serial communication mode to
125 transmission frequency synthetic instruction of frequency synthesizer, while microprocessor 124 directly draws to the keying frequency modulation of frequency synthesizer 125
Foot send 79Hz keyings FM signal all the way.Frequency synthesizer 125 receives the frequency synthesis instruction that microprocessor 124 is sent, to penetrate
The output of frequency multiplier unit 122 is reference source, generates the comprehensive modulation letter of the 5.3125MHz ± Δs f of direct digital synthesis technique
Number, wherein the size of Δ f is determined by the specific line width of atomic frequency standard physical module 103.Three tunnels that microprocessor 124 also generates
The reference signal of 79Hz is respectively fed to the first synchronization phase demodulation unit 141, second and synchronizes 142 phase demodulation list synchronous with third of phase demodulation unit
Member 143, for synchronizing phase demodulation.What microprocessor 124 generated send to the 79Hz keying FM signals in frequency synthesizer 125
There is same phase with the 79Hz reference signals to phase demodulation module 104 are sent.
Wherein, frequency synthesizer 125 is direct digital frequency synthesizer.
Wherein, compensating module 105 is central processor core.
In embodiments of the present invention, compensating module 105 is used to use following manner, judges whether to compensate：
The first step：Control microwave generation module acts on non-modulated detectable signal on physical module.
Second step：By sweep frequency technique fit the first atomic spectral line graph corresponding with the first photocell and with the second light
Corresponding second atomic spectral line graph of battery.
Specifically, it when physical module does not access atomic frequency standard, by inputting non-modulated detectable signal, then detects
It is exported, and to be fitted atomic spectral line graph, magnetic field is not affected by electronic circuit in atomic frequency standard in physical module in the process
It influences, the atomic spectral line graph precision being fitted is high.Wherein, non-modulated detectable signal can be inputted by a frequency source.
Wherein, frequency sweep refers to that control frequency gradually changes in a certain range.
In embodiments of the present invention, by sweep frequency technique fit the first atomic spectral line graph corresponding with the first photocell with
And the second atomic spectral line graph corresponding with the second photocell, including：
It controls non-modulated detectable signal and carries out frequency sweep；
It acquires the first voltage of the frequency discrimination signal of the first photocell output and detects letter correspondingly with first voltage
Number frequency values, fit the first atomic spectral line graph；Acquire the second voltage of the frequency discrimination signal of the second photocell output and with the
The one-to-one detectable signal frequency values of two voltages, fit the second atomic spectral line graph.
Third walks：Detectable signal through ovennodulation is acted on physical module, is respectively obtained by synchronous phase discriminating technology
And the corresponding first error signal Δ W1 of the first photocell, second error signal Δ W2 corresponding with the second photocell and and third
The corresponding Δ W3 of photocell.
In embodiments of the present invention, the first error corresponding with the first photocell is respectively obtained by synchronous phase discriminating technology to believe
Number Δ W1 and corresponding second error signal Δ W2 and Δ W3 corresponding with third photocell of the second photocell, including：
Obtain the first frequency discrimination signal, the second frequency discrimination signal and third frequency discrimination signal that physical module generates, the first frequency discrimination letter
It number is exported by the first photocell, the second frequency discrimination signal exports by the second photocell, and third frequency discrimination signal is exported by third photocell；
First frequency discrimination signal and reference signal are synchronized into phase demodulation, the first error signal Δ W1 is obtained, by the second frequency discrimination
Signal synchronizes phase demodulation with reference signal, obtains the second error signal Δ W2, and third frequency discrimination signal and reference signal are carried out
Synchronous phase demodulation, obtains third error signal Δ W3.
4th step：The mean value for judging Δ W1 or Δ W2 or Δ W1 and Δ W2 respectively causes atomic frequency standard correction with Δ W3
Frequency stability variation.If two kinds of correction modes change all excessive, illustrate atomic frequency standard by external environment influence, this
When without correction；For example, being 1E-11 magnitude atomic frequency standards for stability, if the stability of two kinds of corrections is 1E-10
Magnitude, then may determine that for physical module by ectocine, atomic frequency standard system output signal can be caused by carrying out correction at this time
Saltus step occurs for frequency, at this time without correction.If it is excessive that two kinds of correction modes change all unobvious, the 5th step is executed.If
One of them is apparent excessive：If it is apparent it is excessive be Δ W1 and Δ W2 compositions correction, Δ W3 is directly output to voltage-controlled crystalline substance
Shake, if it is apparent it is excessive be Δ W3 correction, execute the 5th step.
5th step：The corresponding voltage value of two sidebands of detectable signal through ovennodulation is searched in the first atomic spectral line graph
V11 and V12, searched in the second atomic spectral line graph the corresponding voltage value V21 of two sidebands of detectable signal through ovennodulation and
V22.Calculate Δ V1 and Δ V2, Δ V1=V11-V12- Δ W1, Δ V2=V21-V22- Δs W2.When the product of Δ V1 and Δ V2 are
Timing rectifies a deviation to atomic frequency standard；When the product of Δ V1 and Δ V2 are negative, do not rectify a deviation to atomic frequency standard；As Δ V1
It is 0 with the product of Δ V2, and when Δ V1 is not 0, rectifies a deviation to atomic frequency standard；When the product of Δ V1 and Δ V2 are 0, and Δ V1
When being 0, do not rectify a deviation to atomic frequency standard.
Specifically, if to change all unobvious excessive for two kinds of correction modes, when needing to rectify a deviation to atomic frequency standard,
Using the mean value or Δ W1, Δ of any two in any of Δ W1, Δ W2 and Δ W3 either Δ W1, Δ W2 and Δ W3
The mean value of W2 and Δ W3, rectify a deviation to atomic frequency standard.If it is apparent it is excessive be Δ W3 correction, need to atom frequency
When mark is rectified a deviation, using the mean value of any of Δ W1, Δ W2 or Δ W1, Δ W2, rectify a deviation to atomic frequency standard.
Specifically, the detectable signal through ovennodulation includes two sidebands f1, f2, can be found in atomic spectral line corresponding
Voltage value.
When stating deterministic process in realization, the first atomic spectral line graph and the second atomic spectral line are stored in compensating module 105
Figure, the first atomic spectral line graph and the second atomic spectral line graph are to act on non-modulated detectable signal on physical module 103, are led to
Cross what sweep frequency technique was fitted, the first atomic spectral line graph and the first photocell 13a are corresponded to, the second atomic spectral line graph and the second light
Battery 132b is corresponded to.
Specifically, it when physical module does not access atomic frequency standard, by inputting non-modulated detectable signal, then detects
It is exported, and to be fitted atomic spectral line graph, magnetic field is not affected by electronic circuit in atomic frequency standard in physical module in the process
It influences, the atomic spectral line graph precision being fitted is high.Wherein, non-modulated detectable signal can be inputted by a frequency source.
Wherein, frequency sweep refers to that control frequency gradually changes in a certain range.
One of ordinary skill in the art will appreciate that realizing that all or part of step of above-described embodiment can pass through hardware
It completes, relevant hardware can also be instructed to complete by program, the program can be stored in a kind of computer-readable
In storage medium, storage medium mentioned above can be read-only memory, disk or CD etc..
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of passive-type atomic frequency standard, which is characterized in that the passive-type atomic frequency standard includes：Voltage controlled crystal oscillator, microwave generate
Module, physical module, phase demodulation module and compensating module, the microwave generation module respectively with the voltage controlled crystal oscillator, the physics
Module and phase demodulation module electrical connection, the phase demodulation module are also electrically connected with the physical module and the compensating module, institute
It states compensating module to be also electrically connected with the voltage controlled crystal oscillator, the physical module includes microwave cavity, is arranged side by side in the microwave cavity
There are the first chamber bubble and the second chamber bubble, the microwave cavity tail portion to be additionally provided with the first photocell, the second photocell and third photocell,
First photocell and second photocell are arranged side by side, and first photocell and second photocell are about institute
The central axes for stating the first chamber bubble are symmetrical, and the third photocell is on the central axes of the second chamber bubble；
The voltage controlled crystal oscillator, for providing a detectable signal；
The microwave generation module, for being modulated to the detectable signal and the detectable signal through ovennodulation being acted on institute
It states on physical module；
The phase demodulation module is believed for respectively obtaining the first error corresponding with first photocell by synchronous phase discriminating technology
Number Δ W1 and corresponding second error signal Δ W2 of second photocell and third error corresponding with the third photocell
Signal delta W3；
The compensating module, for judging whether to need to the passive-type according to the Δ W1, the Δ W2 and the Δ W3
Atomic frequency standard is rectified a deviation；When needing to rectify a deviation to the passive-type atomic frequency standard, using the Δ W1, the Δ W2 and
Any of described Δ W3 either mean value of any two or the Δ in the Δ W1, the Δ W2 and the Δ W3
The mean value of W1, the Δ W2 and the Δ W3 rectify a deviation to the passive-type atomic frequency standard；
Wherein, the physical module further includes metal partion (metp), and the metal partion (metp) setting is in first chamber bubble and the second chamber bubble
Between；
The phase demodulation module synchronizes phase demodulation unit, the second synchronization phase demodulation unit phase demodulation unit synchronous with third including first, described
First synchronization phase demodulation unit is electrically connected with first photocell, and described second synchronizes phase demodulation unit and second photocell electricity
Connection, the third synchronize phase demodulation unit and are electrically connected with the third photocell；
The microwave generation module includes isolated amplifier, radio frequency multiplier unit, microwave times mixing unit, microprocessor and frequency
Synthesizer, the microprocessor are electrically connected with the phase demodulation module, the isolated amplifier and the frequency synthesizer respectively, institute
It states isolated amplifier to be electrically connected with the voltage controlled crystal oscillator and the radio frequency multiplier unit respectively, the microwave times mixing unit difference
It is electrically connected with the radio frequency multiplier unit, the frequency synthesizer and the physical module；
The microprocessor is used to be used as the source of referring to using the output of the isolated amplifier, by serial communication mode to described
Frequency synthesizer transmission frequency synthetic instruction, while the microprocessor is used for directly to the keying frequency modulation of the frequency synthesizer
Pin send 79Hz keyings FM signal all the way；The frequency synthesizer refers to for receiving the frequency synthesis that the microprocessor is sent
It enables, using the output of the radio frequency multiplier unit as reference source, generates the comprehensive of the 5.3125MHz ± Δs f of direct digital synthesis technique
Modulated signal is closed, the size of Δ f is determined by the line width of the physical module；The microprocessor is additionally operable to generate three road 79Hz's
Reference signal is respectively fed to described first and synchronizes phase demodulation unit, the second synchronization phase demodulation unit phase demodulation list synchronous with the third
Member synchronizes phase demodulation；What the microprocessor generated send in the frequency synthesizer 79Hz keyings FM signal with give
79Hz reference signals to the phase demodulation module have same phase.
2. passive-type atomic frequency standard according to claim 1, which is characterized in that the physical module further include spectrum lamp,
Coupling ring, C field coils, constant temperature unit and magnetic cup, the microwave cavity are arranged in the light path of the spectrum lamp, and the coupling ring is set
It sets in the microwave cavity, the C field coils, the constant temperature unit and the magnetic cup are disposed around the outer of the microwave cavity successively
It encloses.
3. passive-type atomic frequency standard according to claim 2, which is characterized in that the first chamber bubble and second chamber bubble
It resonates and steeps for integrated filtering.
4. passive-type atomic frequency standard according to claim 2, which is characterized in that the microwave cavity is the micro- of TE111 patterns
Wave chamber.
5. according to claim 1-4 any one of them passive-type atomic frequency standards, which is characterized in that first photocell, institute
It is identical photocell to state the second photocell and the third photocell.
6. passive-type atomic frequency standard according to claim 5, which is characterized in that first photocell, second light
Battery and the third photocell are the silicon photocell for having in 800nm most strong ligh-induced effect.
7. according to claim 1-4 any one of them passive-type atomic frequency standards, which is characterized in that the compensating module is center
Processor chips.
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Citations (4)
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|---|---|---|---|---|
| US6255647B1 (en) * | 1999-03-09 | 2001-07-03 | Kernco, Inc. | Atomic frequency standard based on coherent state preparation |
| CN103063650A (en) * | 2012-12-17 | 2013-04-24 | 江汉大学 | Improved atomic ground state energy detection device |
| CN103152038A (en) * | 2013-01-31 | 2013-06-12 | 江汉大学 | Passive rubidium atomic frequency standard servo system and quantum frequency discrimination method |
| CN203119878U (en) * | 2013-02-16 | 2013-08-07 | 江汉大学 | Physical system of atomic frequency standard |
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2016
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6255647B1 (en) * | 1999-03-09 | 2001-07-03 | Kernco, Inc. | Atomic frequency standard based on coherent state preparation |
| CN103063650A (en) * | 2012-12-17 | 2013-04-24 | 江汉大学 | Improved atomic ground state energy detection device |
| CN103152038A (en) * | 2013-01-31 | 2013-06-12 | 江汉大学 | Passive rubidium atomic frequency standard servo system and quantum frequency discrimination method |
| CN203119878U (en) * | 2013-02-16 | 2013-08-07 | 江汉大学 | Physical system of atomic frequency standard |
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