CN105446121A - Physical system - Google Patents
Physical system Download PDFInfo
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- CN105446121A CN105446121A CN201510916938.2A CN201510916938A CN105446121A CN 105446121 A CN105446121 A CN 105446121A CN 201510916938 A CN201510916938 A CN 201510916938A CN 105446121 A CN105446121 A CN 105446121A
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- Prior art keywords
- physical system
- resonance absorption
- absorption chamber
- coil
- field
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- G—PHYSICS
- G04—HOROLOGY
- G04F—TIME-INTERVAL MEASURING
- G04F5/00—Apparatus for producing preselected time intervals for use as timing standards
- G04F5/14—Apparatus for producing preselected time intervals for use as timing standards using atomic clocks
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- General Physics & Mathematics (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
The invention discloses a physical system, and belongs to the field of atomic clocks. The physical system comprises a magnetic screen structure and a light source, a filter bubble, a resonance absorption cavity, a photoelectric detector, a microprocessing chip, a microwave source and a C-field coil which are arranged in the magnetic screen structure; the light source is used for radiating 87Rb pumping light from 87Rb atoms; the filter bubble is filled with 85Rb atoms and used for filtering the 87Rb pumping light; the C-field coil is wound on the exterior of the resonance absorption cavity in a double-layer coil winding mode; the resonance absorption cavity is filled with the 87Rb atoms, and resonance transition is performed under the action of the filtered 87Rb pumping light; the photoelectric detector is used for detecting the 87Rb pumping light passing through the resonance absorption cavity; the microprocessing chip is used for determining residual field information and outputting the residual field information to a servo circuit with the atomic frequency standard, so that the servo circuit adjusts a correction signal according to the residual field information.
Description
Technical field
The present invention relates to atomic clock field, particularly a kind of physical system.
Background technology
Passive-type atomic clock, as high stable, high-precision time synchronized source, is just being widely used in the various fields such as space flight, communication.
Existing passive-type atomic clock mainly comprises the parts such as VCXO, isolated amplifier, times frequency mixing module, physical system, integration module and servo circuit.Wherein, the atomic resonance Absorption Line that physical system provides a frequency stabilization, live width narrower, atomic clock atomic resonance absorption peak obtains high steady rate-adaptive pacemaker by being locked in by the output frequency of VCXO just.Fill Elements Atom in physical system at ordinary times energy level be degeneracy, want to realize above-mentioned application function, need to apply corresponding magnetic field to whole system, be referred to as C field.The effect of C field coil is the weak static magnetic field that generation one and microwave magnetic field direction parallel, and makes atomic ground state hyperfine structure generation Zeeman splitting, and provides quantization axle for atomic transition.
But because physical system itself can be subject to various forms of interference, they are by closed circuit electromagnetism exchanging form, and produce a certain amount of remnant field, the existence of remnant field have impact on atomic clock overall performance greatly.
Summary of the invention
In order to solve the problems of the prior art, embodiments provide a kind of physical system.Described technical scheme is as follows:
Embodiments provide a kind of physical system, described physical system comprises magnetic cup structure, is arranged on the light source in described magnetic cup structure, filter bubble, resonance absorption chamber, photodetector, micro-chip processor, microwave source and C field coil;
Described light source, for by
87rb atomic radiation goes out
87rb pumping light;
Be filled with in described optical filtering bubble
85rb atom, for described
87rb pumping light filters, described in filtering out
87one in Rb pumping light in two hyperfine structure compositions;
Described microwave source, for in described resonance absorption chamber
87rb atomic resonance transition provides pumping signal;
It is outside that described C field coil adopts double-layer coil winding method to be wound on described resonance absorption chamber, for providing the magnetic field of atom division and quantization axle for described resonance absorption chamber;
Be filled with in described resonance absorption chamber
87rb atom, for through filter after
87resonant transition is carried out under the effect of Rb pumping light;
Described photodetector, for behind the described resonance absorption chamber
87rb pumping light detects;
Described micro-chip processor, alive positive and negative for controlling described C field coil institute; Be timing at described C field coil electric current, control described microwave source and carry out frequency sweep output, according to corresponding relation matching first absorption line of the magnitude of voltage that described microwave source output frequency and described photodetector detect; At described C field coil electric current for time negative, controlling described microwave source carries out frequency sweep output, according to corresponding relation matching second absorption line of the magnitude of voltage that described microwave source output frequency and described photodetector detect; According to described first absorption line and described second absorption line determination remnant field information; Described remnant field information is exported to the servo circuit of atomic frequency standard, according to described remnant field information, deviation correcting signal is adjusted to make described servo circuit.
In a kind of implementation of the embodiment of the present invention, described light source is for being filled with
87the spectrum lamp of Rb gas.
In the another kind of implementation of the embodiment of the present invention, described spectrum lamp comprises electrodeless discharge lamp, and described electrodeless discharge lamp comprises: be filled with
87the little glass envelope of Rb and the coil with power oscillator, described little glass envelope is placed in described coil.
In the another kind of implementation of the embodiment of the present invention, described photodetector comprises photoelectric cell.
In the another kind of implementation of the embodiment of the present invention, described resonance absorption chamber comprises microwave cavity and is placed in described microwave cavity
87rb absorbs bubble.
In the another kind of implementation of the embodiment of the present invention, described C field coil is enamel wire coil.
In the another kind of implementation of the embodiment of the present invention, described physical system also comprises: the constant temperature unit being located at outside, described resonance absorption chamber.
In the another kind of implementation of the embodiment of the present invention, described resonance absorption cavity outer wall is provided with the groove of circumference, and described constant temperature unit is the heater strip in the groove of winding on described resonance absorption cavity outer wall.
In the another kind of implementation of the embodiment of the present invention, described heater strip adopts two-wire to twist the winding mode winding of fried dough twist in described groove.
In the another kind of implementation of the embodiment of the present invention, described resonance absorption chamber comprises chamber lid, and described physical system also comprises: the chamber being located at described resonance absorption chamber covers thermistor.
The beneficial effect that the technical scheme that the embodiment of the present invention provides is brought is:
Magnetic cup structure is added on the one hand outside physical system, to shield the earth magnetism size around physical system, simultaneously by adopting double-layer coil winding method coiling C field coil, offset the stray magnetic field that circuit in physical system etc. produces, above-mentioned two kinds of modes substantially reduce the remnant field in physical system; On the other hand, remnant field is calculated and sends to servo circuit, to make servo circuit adjust deviation correcting signal according to remnant field information, further obviate the impact of remnant field.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of a kind of physical system that the embodiment of the present invention provides;
Fig. 2 is the C field coil coiling schematic diagram that the embodiment of the present invention provides;
Fig. 3 is the absorption line schematic diagram that the embodiment of the present invention provides;
Fig. 4 is the structural representation in the resonance absorption chamber that the embodiment of the present invention provides;
Fig. 5 is the heater strip coiling schematic diagram that the embodiment of the present invention provides.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Fig. 1 is the structural representation of a kind of physical system that the embodiment of the present invention provides, see Fig. 1, physical system comprises magnetic cup structure 100, is arranged on the light source 101 in magnetic cup structure 100, optical filtering bubble 102, resonance absorption chamber 103, photodetector 104, micro-chip processor 105, microwave source 106 and C field coil 107.
Light source 101, for by
87rb atomic radiation goes out
87rb pumping light.
Be filled with in optical filtering bubble 102
85rb atom, for right
87rb pumping light filters, and filters out
87one in Rb pumping light in two hyperfine structure compositions.
Microwave source 106, for in resonance absorption chamber 103
87rb atomic resonance transition provides pumping signal.
C field coil 107 adopts double-layer coil winding method to be wound on outside, resonance absorption chamber 103 (as shown in Figure 2), for providing the magnetic field of atom division and quantization axle for resonance absorption chamber 103.
Be filled with in resonance absorption chamber 103
87rb atom, for through filter after
87resonant transition is carried out under the effect of Rb pumping light.
Photodetector 104, for behind the resonance absorption chamber 103
87rb pumping light detects.
Micro-chip processor 105, for control C field coil 107, institute is alive positive and negative; Be timing at C field coil 107 electric current, control microwave source 106 and carry out frequency sweep output, according to corresponding relation matching first absorption line of the magnitude of voltage that microwave source 106 output frequency and photodetector 104 detect; At C field coil 107 electric current for time negative, control microwave source 106 and carry out frequency sweep output, according to corresponding relation matching second absorption line of the magnitude of voltage that microwave source 106 output frequency and photodetector 104 detect; According to the first absorption line and the second absorption line determination remnant field information; Remnant field information is exported to the servo circuit of atomic frequency standard, according to remnant field information, deviation correcting signal is adjusted to make servo circuit.
Wherein, optical filtering bubble 102, resonance absorption chamber 103, photodetector 104 are located on the progress path of the pumping light that light source 101 provides successively, and micro-chip processor 105 is electrically connected with photodetector 104, microwave source 106, C field coil 107 and servo circuit respectively.
In embodiments of the present invention, magnetic cup structure 100 is added on the one hand outside physical system, to shield the earth magnetism size around physical system, simultaneously by adopting double-layer coil winding method coiling C field coil 107, offset the stray magnetic field that circuit in physical system etc. produces, above-mentioned two kinds of modes substantially reduce the remnant field in physical system; On the other hand, remnant field is calculated and sends to servo circuit, to make servo circuit adjust deviation correcting signal according to remnant field information, further obviate the impact of remnant field.
Particularly, micro-chip processor 105 determines remnant field information in the following way:
The current value of a setting C field coil 107, the pumping signal that now the enable microwave source 106 of micro-chip processor 105 exports certain frequency completes first resonance absorption process, after photodetection, obtain corresponding light inspection signal magnitude V, be saved in micro-chip processor 105, micro-chip processor 105 records the exciting signal frequency value F of the microwave source 106 in this moment simultaneously.Using such method, micro-chip processor 105 changes the output signal frequency value of microwave source 106 successively, completes the matching of absorption line (the first absorption line), as shown in Figure 3.Get peak value 1,2 and 3 in Fig. 3, Zeeman frequency is defined as top (peak value 1) and the frequency difference on time peak (peak value 2 or 3), calculates the first Zeeman frequency according to peak value 1,2 and 3.
After the matching completing above-mentioned absorption line, change C field coil 107 direction of current, complete the matching of the second absorption line, obtain corresponding peak value 1,2 and 3 simultaneously, calculate the second Zeeman frequency according to peak value 1,2 and 3.
Calculate the difference of the first Zeeman frequency and the second Zeeman frequency, according to the information of the difference prestored and Magnetic Field determination remnant field.The information of remnant field can be magnitude of field intensity.
Data instance so that following table obtains:
| Peak 2 (MHz) | Peak 1 (MHz) | Peak 3 (MHz) | |
| C field coil 107 electric current positive dirction | 6834.33890 | 6834.41217 | 6834.48558 |
| C field coil 107 electric current negative direction | 6834.34086 | 6834.41216 | 6834.48348 |
According to upper table can calculate C field current direction change before the first Zeeman frequency be F11=73.27KHz, F12=73.41KHz, the second Zeeman frequency after C field current direction changes is F21=71.30KHz, F22=71.32KHz, F11, F12 are averaged, F21, F22 are averaged, then calculate the first Zeeman frequency and the second Zeeman frequency difference, obtaining C field current direction Zeeman frequency variable quantity before and after change is △ F=2.03KHz.Because in above process, only change C field current direction, and do not change C field current size, therefore the atom division produced can not change with the magnetic field size of quantization axle, namely should be unable to there is size variation in Zeeman frequency, but in fact at C field current, the Zeeman frequency that reverse fore-and-aft survey obtains occurs and differ △ F=2.03KHz, this difference is by system caused by remnant field.Rule of thumb measurement scale value 0.7KHz/1mG (relation between magnitude of field intensity and Zeeman frequency) and △ F, the size absolute value calculating remnant field is 2.03KHz/ (0.7KHz/1mG)=2.9mG.
In embodiments of the present invention, micro-chip processor 105 exports the size of remnant field to atomic frequency standard servo circuit, servo circuit adjusts deviation correcting signal according to the size of remnant field, such as, add deviation correcting signal or deduct a fixing small voltage value.Deviation correcting signal is used for adjusting the output of VCXO in atomic frequency standard.
In embodiments of the present invention, light source 101 is for being filled with
87the spectrum lamp of Rb gas.
In embodiments of the present invention, spectrum lamp comprises electrodeless discharge lamp, and electrodeless discharge lamp comprises: be filled with
87the little glass envelope of Rb and the coil with power oscillator, little glass envelope is placed in coil.
In embodiments of the present invention, photodetector 104 comprises photoelectric cell.
As shown in Figure 4, resonance absorption chamber 103 comprises microwave cavity 13A and is placed in microwave cavity 13A
87rb absorbs bubble 13B.
In embodiments of the present invention, C field coil 107 is enamel wire coil.
Alternatively, physical system also comprises: the constant temperature unit being located at outside, resonance absorption chamber 103.
As shown in Figure 4, resonance absorption chamber 103 outer wall is provided with the groove 131 of circumference, and constant temperature unit is the heater strip 132 in the groove 131 of winding on the outer wall of resonance absorption chamber 103.
As shown in Figure 5, heater strip 132 adopts two-wire to twist the winding mode winding of fried dough twist in groove 131, and the winding mode adopting two-wire to twist fried dough twist can offset the magnetic field that heater strip 132 energising produces, and reduces remnant field size.
Alternatively, resonance absorption chamber 103 comprises chamber lid 13C, and physical system also comprises: thermistor 133 on 13C is covered, for monitoring resonance absorption chamber 103 temperature in the chamber being located at resonance absorption chamber 103, using the foundation as constant temperature unit adjustment temperature, thus realize the temperature constant of physical system.
Heater strip 132 and thermistor 133 can be electrically connected with micro-chip processor 105, thus realize temperature control.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a physical system, is characterized in that, described physical system comprises magnetic cup structure, is arranged on the light source in described magnetic cup structure, filter bubble, resonance absorption chamber, photodetector, micro-chip processor, microwave source and C field coil;
Described light source, for by
87rb atomic radiation goes out
87rb pumping light;
Be filled with in described optical filtering bubble
85rb atom, for described
87rb pumping light filters, described in filtering out
87one in Rb pumping light in two hyperfine structure compositions;
Described microwave source, for in described resonance absorption chamber
87rb atomic resonance transition provides pumping signal;
It is outside that described C field coil adopts double-layer coil winding method to be wound on described resonance absorption chamber, for providing the magnetic field of atom division and quantization axle for described resonance absorption chamber;
Be filled with in described resonance absorption chamber
87rb atom, for through filter after
87resonant transition is carried out under the effect of Rb pumping light;
Described photodetector, for behind the described resonance absorption chamber
87rb pumping light detects;
Described micro-chip processor, alive positive and negative for controlling described C field coil institute; Be timing at described C field coil electric current, control described microwave source and carry out frequency sweep output, according to corresponding relation matching first absorption line of the magnitude of voltage that described microwave source output frequency and described photodetector detect; At described C field coil electric current for time negative, controlling described microwave source carries out frequency sweep output, according to corresponding relation matching second absorption line of the magnitude of voltage that described microwave source output frequency and described photodetector detect; According to described first absorption line and described second absorption line determination remnant field information; Described remnant field information is exported to the servo circuit of atomic frequency standard, according to described remnant field information, deviation correcting signal is adjusted to make described servo circuit.
2. physical system according to claim 1, is characterized in that, described light source is for being filled with
87the spectrum lamp of Rb gas.
3. physical system according to claim 2, is characterized in that, described spectrum lamp comprises electrodeless discharge lamp, and described electrodeless discharge lamp comprises: be filled with
87the little glass envelope of Rb and the coil with power oscillator, described little glass envelope is placed in described coil.
4. physical system according to claim 1, is characterized in that, described photodetector comprises photoelectric cell.
5. physical system according to claim 1, is characterized in that, described resonance absorption chamber comprises microwave cavity and is placed in described microwave cavity
87rb absorbs bubble.
6. physical system according to claim 1, is characterized in that, described C field coil is enamel wire coil.
7. the physical system according to any one of claim 1 to 6, is characterized in that, described physical system also comprises: the constant temperature unit being located at outside, described resonance absorption chamber.
8. physical system according to claim 7, is characterized in that, described resonance absorption cavity outer wall is provided with the groove of circumference, and described constant temperature unit is the heater strip in the groove of winding on described resonance absorption cavity outer wall.
9. physical system according to claim 8, is characterized in that, described heater strip adopts two-wire to twist the winding mode winding of fried dough twist in described groove.
10. the physical system according to any one of claim 1 to 6, is characterized in that, described resonance absorption chamber comprises chamber lid, and described physical system also comprises: the chamber being located at described resonance absorption chamber covers thermistor.
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| CN201510916938.2A CN105446121A (en) | 2015-12-10 | 2015-12-10 | Physical system |
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| CN201510916938.2A CN105446121A (en) | 2015-12-10 | 2015-12-10 | Physical system |
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Cited By (3)
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| CN106129573A (en) * | 2016-08-19 | 2016-11-16 | 中国科学院武汉物理与数学研究所 | A kind of New type atom frequency marking microwave cavity |
| CN109861074A (en) * | 2018-12-13 | 2019-06-07 | 江汉大学 | Device based on the hyperfine quantum excitation of ground state |
| CN110928174A (en) * | 2019-12-17 | 2020-03-27 | 中国科学院国家授时中心 | Atomic clock frequency discrimination signal detection system |
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| CN110928174B (en) * | 2019-12-17 | 2022-01-11 | 中国科学院国家授时中心 | Atomic clock frequency discrimination signal detection system |
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