CN104410415A - Improved passive atomic frequency scale - Google Patents
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- CN104410415A CN104410415A CN201410698886.1A CN201410698886A CN104410415A CN 104410415 A CN104410415 A CN 104410415A CN 201410698886 A CN201410698886 A CN 201410698886A CN 104410415 A CN104410415 A CN 104410415A
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Abstract
The invention discloses an improved passive atomic frequency scale, and belongs to the field of atomic frequency scales. The improved passive atomic frequency scale comprises a voltage-controlled crystal oscillator, a physical system and an electronic circuit. The electronic circuit comprises a comprehensive module, a frequency multiplying module, a frequency mixing module and a servo module, and the voltage-controlled crystal oscillator is used for outputting 40MHz frequency signals; the comprehensive module comprises a first processing unit, a digital frequency synthesizer and a first filter, the frequency multiplying module comprises a pulse generating unit, a second filter, a primary amplifier circuit, a third filter and a secondary amplifier circuit, the frequency mixing module comprises a synthesis matching network, a mixer, a filter cavity and a power amplifier, the servo module comprises a 16-bit analog-digital converter, a second processing unit and a 20-bit digital-analog converter, and the first processing unit and the second processing unit are integrated on the same processor.
Description
Technical field
The present invention relates to field of atomic frequency standard, the passive-type atomic frequency standard of particularly a kind of improvement.
Background technology
Atomic frequency standard, as high stable, high-precision time synchronized source, is just being widely used in the various fields such as space flight, communication.
Existing atomic frequency standard mainly comprises VCXO, physical system and electronic circuit.Wherein, VCXO exports original frequency signal; The output frequency signal of VCXO is carried out process and produces microwave interrogation signals by electronic circuit; Physical system carries out frequency discrimination to microwave interrogation signals, produces light inspection signal; Electronic circuit carries out synchronous phase demodulation to after light inspection signal frequency-selecting amplification and square wave shaping, produce correction voltage and act on VCXO, to adjust the output frequency of VCXO, the output frequency of VCXO is locked in atomic ground state hyperfine 0-0 centre frequency the most at last.
Realizing in process of the present invention, inventor finds that prior art at least exists following problem:
In the electronic circuit of existing atomic frequency standard, parts all adopt integrated modular to realize usually, cannot control the arbitrary parameter in each module, cause and use inconvenience.
Summary of the invention
In order to solve the problem of prior art, embodiments provide a kind of passive-type atomic frequency standard of improvement.Described technical scheme is as follows:
Embodiments provide a kind of passive-type atomic frequency standard of improvement, comprising: VCXO, physical system and electronic circuit, described electronic circuit comprises integration module, times frequency module, frequency mixing module and servo module,
Described VCXO, for exporting the frequency signal of 40MHz;
Described integration module comprises the first processing unit, digital frequency synthesizer and the first filter, described first processing unit is used for generating according to described frequency signal keying FM signal and the reference signal that duty ratio and frequency all identical with frequency is 117Hz, and control described digital frequency synthesizer, according to described frequency signal, 6 frequencys multiplication are carried out as system clock to described frequency signal, described digital frequency synthesizer is used for the FM signal producing 114.6874Mhz ± Δ f under described system clock and the effect of described keying FM signal, described first filter is used for carrying out filtering to the FM signal that described digital frequency synthesizer exports, 2* Δ f=300Hz,
Described times of frequency module comprises impulse generating unit, the second filter, one-level amplifying circuit, the 3rd filter and second amplifying circuit, described impulse generating unit obtains frequency-doubled signal for receiving described frequency signal and carrying out 6 frequencys multiplication, described frequency-doubled signal is after described second filter, one-level amplifying circuit, the 3rd filter and second amplifying circuit, obtain simple signal, the power output of described simple signal is 100mW;
Described frequency mixing module comprises synthesis matching network, blender, filtering chamber and power amplifier, described synthesis matching network is for receiving described simple signal and described FM signal, and carry out impedance matching, described blender and described filtering chamber are used for the described simple signal that exports described synthesis matching network and described FM signal carries out microwave mixer, obtain the microwave frequency signal of 6834.6875MHz ± Δ f, described power amplifier is used for sending after the power amplification of described microwave frequency signal to+4dBm into described physical system;
Described servo module comprises the analog to digital converter of 16, the digital to analog converter of the second processing unit and 20, described analog to digital converter receives and processes the quantum frequency discrimination signal of described physical system output, described second processing unit is used for carrying out cumulative mean to the quantum frequency discrimination signal that described analog to digital converter exports, obtain average quantum frequency discrimination signal, synchronous phase demodulation is carried out to described reference signal and described average quantum frequency discrimination signal, and produce synchronous phase discrimination signal, adopting described synchronous phase discrimination signal to control described digital to analog converter generation correction voltage acts on described VCXO, the scope of described correction voltage is 0 ~ 10V,
Described first processing unit and described second processing unit on the same processor integrated.
In a kind of implementation of the embodiment of the present invention, described physical system comprises: spectroscopic lamp and resonant probe device; Described resonant probe device comprises: microwave cavity, the winding C field coil on described microwave cavity, the constant-current source be electrically connected with described C field coil, the integrated filtering be located in described microwave cavity resonate and steep and photocell and be located at the coupling loop of described microwave cavity afterbody, described integrated filtering resonance bubble and described photocell are all located in the light path of described spectroscopic lamp, and described integrated filtering resonance bubble is between described spectroscopic lamp and described photocell, described microwave cavity afterbody refers to the one end away from described spectroscopic lamp in described microwave cavity.
In the another kind of implementation of the embodiment of the present invention, described photocell is the silicon photocell having the strongest ligh-induced effect at 800nm.
In the another kind of implementation of the embodiment of the present invention, described spectroscopic lamp is electrodeless discharge lamp.
In the another kind of implementation of the embodiment of the present invention, described physical system also comprises: the first thermostat, the second thermostat and temperature control circuit, described temperature control circuit is electrically connected with described first thermostat and described second thermostat respectively, and described spectroscopic lamp and described resonant probe device are located in described first thermostat and described second thermostat respectively.
In the another kind of implementation of the embodiment of the present invention, described physical system also comprises: magnetic cup, and described second thermostat is located in described magnetic cup.
In the another kind of implementation of the embodiment of the present invention, described physical system also comprises slide rheostat Rk and fixed resistance R, and described slide rheostat Rk connects with described C field coil, and described fixed resistance R is in parallel with described slide rheostat Rk;
Described second processing unit, also for the resistance control C field current by changing described slide rheostat Rk.
In the another kind of implementation of the embodiment of the present invention, described atomic frequency standard also comprises: output module, for receiving the output frequency of described VCXO after the effect of correction voltage, and to described output frequency frequency division, obtains the frequency values that user needs.
In the another kind of implementation of the embodiment of the present invention, described output module comprises frequency divider, sinewave output unit and TTL (transistor transistor logic) TTL signal output unit, described frequency divider is used for carrying out frequency division to described VCXO output frequency, described sinewave output unit is used for the output frequency after described frequency division to export with sine wave, and described pipe transistor logic TTL signal output unit is used for the output frequency of sine wave being converted into TTL signal and exports.
In the another kind of implementation of the embodiment of the present invention, described frequency divider is divide by four circuit.
The beneficial effect that the technical scheme that the embodiment of the present invention provides is brought is:
By a module in electronic circuit in employing discrete component composition prior art, and provide detailed parameter, be convenient on the one hand realize controlling the arbitrary parameter in each module, easy to use; In addition, these improve parameter unifications can be got up control, thus precisely can regulate complete machine, make atomic frequency standard can reach requirement more accurately.
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 the passive-type atomic frequency standard of the improvement that the embodiment of the present invention provides;
Fig. 2 is the structural representation of the integration module that the embodiment of the present invention provides;
Fig. 3 is the structural representation of times frequency module that the embodiment of the present invention provides;
Fig. 4 is the structural representation of the frequency mixing module that the embodiment of the present invention provides;
Fig. 5 is the structural representation of the servo module that the embodiment of the present invention provides;
Fig. 6 is the structural representation of the physical system that the embodiment of the present invention provides;
Fig. 7 is the structural representation of the physical system that the embodiment of the present invention provides;
Fig. 8 is the structural representation of the output module 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.
Embodiment
Embodiments provide a kind of passive-type atomic frequency standard of improvement, see Fig. 1, this atomic frequency standard comprises: VCXO 100, physical system 200 and electronic circuit 300, and electronic circuit 300 comprises integration module 301, times frequency module 302, frequency mixing module 303 and servo module 304.
VCXO 100, for exporting the frequency signal of 40MHz.
As shown in Figure 2, integration module 301 comprises the first processing unit 301a, digital frequency synthesizer 301b and the first filter 301c, first processing unit 301a is used for generating according to frequency signal keying FM signal and the reference signal that duty ratio and frequency all identical with frequency is 117Hz, and control figure frequency synthesizer 301b carries out 6 frequencys multiplication as system clock according to frequency signal to frequency signal, digital frequency synthesizer 301b is used for the FM signal producing 114.6874Mhz ± Δ f under system clock and the effect of keying FM signal, the FM signal that first filter 301c is used for digital frequency synthesizer exports carries out filtering,
As shown in Figure 3, times frequency module 302 comprises impulse generating unit 302a, the second filter 302b, one-level amplifying circuit 302c, the 3rd filter 302d and second amplifying circuit 302e, impulse generating unit 302a is used for receiving frequency signals and carries out 6 frequencys multiplication obtaining frequency-doubled signal, frequency-doubled signal is after the second filter 302b, one-level amplifying circuit 302c, the 3rd filter 302d and second amplifying circuit 302e, obtain simple signal, the power output of simple signal is 100mW.
As shown in Figure 4, frequency mixing module 303 comprises synthesis matching network 303a, blender 303b, filtering chamber 303c and power amplifier 303d, synthesis matching network 303a is for receiving simple signal and FM signal, and carry out impedance matching, simple signal and FM signal that blender 303b and filtering chamber 303c is used for synthesizing matching network output carry out microwave mixer, obtain the microwave frequency signal of 6834.6875MHz ± Δ f, power amplifier 303d is used for sending after the power amplification of microwave frequency signal to+4dBm into physical system.
As shown in Figure 5, servo module 304 comprises the analog to digital converter 304a of 16, the digital to analog converter 304c of the second processing unit 304b and 20, analog to digital converter 304a receives and processes the quantum frequency discrimination signal of physical system 200 output, the quantum frequency discrimination signal that second processing unit 304b is used for analog to digital converter 304a exports carries out cumulative mean, obtain average quantum frequency discrimination signal, synchronous phase demodulation is carried out to reference signal and average quantum frequency discrimination signal, and produce synchronous phase discrimination signal, adopting synchronous phase discrimination signal domination number weighted-voltage D/A converter 304c to produce correction voltage acts on VCXO, the scope of correction voltage is 0 ~ 10V.
First processing unit 301a and the second processing unit 304b is on the same processor integrated.
In integration module 301, digital frequency synthesizer 301b is containing 4-20 frequency multiplication, when being greater than 10 frequency multiplication in use sheet, phase noise is than large when not using, therefore when designing, in order to reduce, the reduction of frequency multiplication number of times is additional makes an uproar mutually and considers that obtaining 114.6875MHz frequency signal exports needs, adopt VCXO 40MHz clock signal to make the reference signal of digital frequency synthesizer 301b, then in sheet, 6 frequencys multiplication obtain 240MHz signal as system clock.
First processing unit 301a arranges the concrete rate-adaptive pacemaker of digital frequency synthesizer 301b by software command control word.Digital frequency synthesizer 301b as selected is 48, external clock is chosen as 40MHz, inner employing 6 times of phase-locked loops are (English: Phase Locked Loop, be called for short: PLL), the frequency range that then digital frequency synthesizer 301b exports in theory is 0-240MHz, first processing unit 301a changes 48 binary digits ' 0 ' or ' 1 ' by software command control word, thus changes the concrete rate-adaptive pacemaker of digital frequency synthesizer 301b, and its resolution is (240MHz/2
48).In concrete enforcement, the first processing unit 301a produces the FSK pin that keying FM signal (as: frequency is 117Hz) that a road duty ratio is 1:1 delivers to digital frequency synthesizer 301b, reaches the effect of keying frequency modulation.When occurring high level ' 1 ', it is F1 that digital frequency synthesizer 301b produces frequency signal, and when occurring low level ' 0 ', it is F2 that digital frequency synthesizer 301b produces frequency signal, wherein F1=114.6875MHz-Δ f, F2=114.6875MHz+ Δ f.Here 2* Δ f is called modulation depth, and its size value should be less than the size of atom natural linewidth, and modulation depth is less than the atom live width of physical system, desirable 300Hz.
For aiming in actual physical system 200
87rb atom center 0-0 jump frequency, meet the needs of debugging efforts, the output of the 114.6875MHz frequency signal of integration module 301 can be changed easily, this function is realized by the mode of serial communication, and corresponding first processing unit 301a band EEPROM (Electrically Erasable Programmable Read Only Memo) register (English: Electrically Erasable Programmable Read-OnlyMemory, be called for short: EEPROM), preserve the parameter changed.
Further, the frequency ratio that digital frequency synthesizer 301b works is higher, and chip operationally can be hot, not only affects normal circuit working state, even can cause burning of chip, therefore consider when designing fin to be arranged on digital frequency synthesizer 301b.Namely integration module 301 also comprises radiator, and fin is arranged on digital frequency synthesizer 301b, connects above fin with lid, to obtain larger radiating surface.Compressed with lid by four springs above fin and contact, when ensureing long-term work, the good contact between digital frequency synthesizer 301b and fin.
In the present embodiment, the additional phase noise of times frequency module 302 is equivalent to a little phase modulation of parasitism, make frequency-doubled signal extremely narrow, therefore it make an uproar mutually low, high order harmonic component is enriched, main side frequency rejection ratio large (-50dB), and efficiency is high, thus make the negative effect of times frequency module 302 pairs of complete machine stabilitys ignore (additional instability δ (1ms)≤1 × 10-10, δ (1S)≤8 × 10-13).
In servo module 304, the scheme of cumulative mean is adopted to carry out synchronous phase demodulation.Namely the quantum frequency discrimination signal that the second processing unit 304b is used for analog to digital converter 304a exports carries out cumulative mean, obtain average quantum frequency discrimination signal, then synchronous phase demodulation is carried out to reference signal and average quantum frequency discrimination signal, and produce synchronous phase discrimination signal, do the compression that can be less than the noise component of loop response time easily performance period like this.Affect the noise mainly white noise of the short steady index of Rb atom frequency marking, theoretical according to signal statistics, this noise like can effectively be suppressed by cumulative mean, and N time signal to noise ratio can improve by cumulative mean
doubly.
As shown in Figure 6, physical system 200 comprises: spectroscopic lamp 10 and resonant probe device 20; Resonant probe device 20 comprises: microwave cavity 21, the winding C field coil 22 on microwave cavity 21, the constant-current source 23 be electrically connected with C field coil 22, the integrated filtering be located in microwave cavity 21 resonate bubble 24 and photocell 25 and be located at the coupling loop 26 of microwave cavity 21 afterbody, integrated filtering resonance bubble 24 and photocell 25 are located in the light path of spectroscopic lamp 10, and integrated filtering resonance bubble 24 is between spectroscopic lamp 10 and photocell 25, above-mentioned microwave cavity 21 afterbody refers to the one end away from spectroscopic lamp 10 in microwave cavity 21.Operationally, microwave frequency signal 50 is carried out coupling in microwave cavity 21 by coupling loop 26.By being located at the coupling loop of microwave cavity afterbody, not only can reduce the luminous interference to coupling loop of spectroscopic lamp, simultaneously because atomic transition mainly occurs in the afterbody of microwave cavity, absorbing therefore, it is possible to strengthen atomic resonance; In addition, by being located at the integrated filtering resonance bubble in microwave cavity, optical filtering bubble and resonance bubble being integrated, reduces the volume of physical system, be conducive to the miniaturization of atomic frequency standard.
Wherein, photocell 25 is preferably the silicon photocell having the strongest ligh-induced effect at 800nm, and large area covers, to improve the precision of light inspection.
Wherein, spectroscopic lamp 10 can be electrodeless discharge lamp.For Rb atom frequency marking, in the bulb of spectroscopic lamp 10 except being filled with rubidium, be also filled with the inertia starter gas that excitation potential is low.Conventional starter gas is Kr gas or Ar gas.Spectroscopic lamp 10 is by radio frequency source excitation luminescence.
Further, this physical system 200 also comprises: the first thermostat 31, second thermostat 32 and temperature control circuit 33, temperature control circuit 33 is electrically connected with the first thermostat 31 and the second thermostat 32 respectively, and spectroscopic lamp 10 and resonant probe device 20 are located in the first thermostat 31 and the second thermostat 32 respectively.
Further, this physical system 200 also comprises: magnetic cup 40, and the second thermostat 32 is located in magnetic cup 40.
As shown in Figure 7, physical system 200 also comprises slide rheostat Rk and fixed resistance R, and slide rheostat Rk connects with C field coil 22, and fixed resistance R is in parallel with slide rheostat Rk;
Second processing unit 304b, also for the resistance control C field current by changing slide rheostat Rk.
When the design of physical system 200, to connect an adjustable slide rheostat Rk to C field coil 22, and this slide rheostat Rk is placed on the shell of whole physical system 200, adopting fixed resistance R in parallel with slide rheostat Rk simultaneously, preventing from accidentally causing the currentless situation in C field because regulating.The resistance changing Rk due to user will directly change the electrical current of C field wire circle, therefore this mode directly changes the magnetic field size providing division to physical system 200 Atom, this will cause the change of the absolute frequency value 6834.6875MHz of atom 0-0 transition, thus serves the object of frequency absolute value correction.
In this atomic frequency standard, after the photocell of physical system 200 and VCXO 100 are determined, the noise spectrum of the selection of frequency modulating signal and these parts is closely related.Photronic sudden strain of a muscle phase noise has the frequency characteristic of 1/f, for avoiding the impact of dodging phase noise, the sudden strain of a muscle phase noise of measurement photoelectric cells is needed to compose, when selecting modulating frequency, phase noise spectrum is dodged according to the photocell recorded, should lean on to high-end in the conceived case as far as possible, make the contribution of sudden strain of a muscle phase noise and Johnson noise than negligible.And VCXO is as the local oscillator of system, it is mainly positioned at the phase noise near frequency modulating signal to the impact of complete machine Stability index.From frequency modulating signal more close to, they are larger on the impact of the stability of long sample time, otherwise, then larger on the stability impact of short sample time.Therefore, when selecting modulating frequency except considering that photocell dodges except phase noise, also should consider to avoid the stronger region of VCXO phase noise.
In embodiments of the present invention, atomic frequency standard also comprises: output module 400, for receiving the output frequency of VCXO 100 after the effect of correction voltage, and to output frequency frequency division, obtains the frequency values that user needs.
See Fig. 8, it is (English: Transistor Transistor Logic that output module 400 comprises frequency divider 401, sinewave output unit 402 and TTL (transistor transistor logic), be called for short: TTL) signal output unit 403, frequency divider 401 is for carrying out frequency division to VCXO output frequency, sinewave output unit 402 is for exporting the output frequency after frequency division with sine wave, and TTL signal output unit 403 exports for the output frequency of sine wave being converted into TTL signal.
Further, TTL signal output unit 403 comprises resistance R1, resistance R2, resistance R31, resistance R32, resistance R41, resistance R42, resistance R5, electric capacity C1, electric capacity C2, electric capacity C3 and operational amplifier 403a, resistance R1, electric capacity C1, resistance R2 connects successively and is connected to the in-phase input end of operational amplifier 403a, electric capacity C3, resistance R31 connects and is connected to the in-phase input end of operational amplifier 403a, one end of resistance R32 is connected to the in-phase input end of operational amplifier 403a, resistance R41 one end is connected to the in-phase input end of operational amplifier 403a, the resistance R41 other end is connected between resistance R31 and electric capacity C3, resistance R5 is connected between resistance R31 and electric capacity C3, electric capacity C2 and resistance R42 is all connected to the inverting input of operational amplifier 403a, the output of sinewave output unit 402 is connected between resistance R1 and electric capacity C1, the output of operational amplifier 403a for exporting TTL signal, resistance R1, electric capacity C1, resistance R42, one end ground connection of electric capacity C3, a termination 5V power supply of resistance R5.
The embodiment of the present invention by a module in electronic circuit in employing discrete component composition prior art, and provides detailed parameter, is convenient on the one hand realize controlling the arbitrary parameter in each module, easy to use; In addition, these improve parameter unifications can be got up control, thus precisely can regulate complete machine, make atomic frequency standard can reach requirement more accurately.
One of ordinary skill in the art will appreciate that all or part of step realizing above-described embodiment can have been come by hardware, the hardware that also can carry out instruction relevant by program completes, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium mentioned can be read-only memory, disk or CD etc.
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. the passive-type atomic frequency standard improved, comprising: VCXO, physical system and electronic circuit, described electronic circuit comprises integration module, times frequency module, frequency mixing module and servo module, it is characterized in that,
Described VCXO, for exporting the frequency signal of 40MHz;
Described integration module comprises the first processing unit, digital frequency synthesizer and the first filter, described first processing unit is used for generating according to described frequency signal keying FM signal and the reference signal that duty ratio and frequency all identical with frequency is 117Hz, and control described digital frequency synthesizer, according to described frequency signal, 6 frequencys multiplication are carried out as system clock to described frequency signal, described digital frequency synthesizer is used for the FM signal producing 114.6874Mhz ± Δ f under described system clock and the effect of described keying FM signal, described first filter is used for carrying out filtering to the FM signal that described digital frequency synthesizer exports, 2* Δ f=300Hz,
Described times of frequency module comprises impulse generating unit, the second filter, one-level amplifying circuit, the 3rd filter and second amplifying circuit, described impulse generating unit obtains frequency-doubled signal for receiving described frequency signal and carrying out 6 frequencys multiplication, described frequency-doubled signal is after described second filter, one-level amplifying circuit, the 3rd filter and second amplifying circuit, obtain simple signal, the power output of described simple signal is 100mW;
Described frequency mixing module comprises synthesis matching network, blender, filtering chamber and power amplifier, described synthesis matching network is for receiving described simple signal and described FM signal, and carry out impedance matching, described blender and described filtering chamber are used for the described simple signal that exports described synthesis matching network and described FM signal carries out microwave mixer, obtain the microwave frequency signal of 6834.6875MHz ± Δ f, described power amplifier is used for sending after the power amplification of described microwave frequency signal to+4dBm into described physical system;
Described servo module comprises the analog to digital converter of 16, the digital to analog converter of the second processing unit and 20, described analog to digital converter receives and processes the quantum frequency discrimination signal of described physical system output, described second processing unit is used for carrying out cumulative mean to the quantum frequency discrimination signal that described analog to digital converter exports, obtain average quantum frequency discrimination signal, synchronous phase demodulation is carried out to described reference signal and described average quantum frequency discrimination signal, and produce synchronous phase discrimination signal, adopting described synchronous phase discrimination signal to control described digital to analog converter generation correction voltage acts on described VCXO, the scope of described correction voltage is 0 ~ 10V,
Described first processing unit and described second processing unit on the same processor integrated.
2. atomic frequency standard according to claim 1, is characterized in that, described physical system comprises: spectroscopic lamp and resonant probe device; Described resonant probe device comprises: microwave cavity, the winding C field coil on described microwave cavity, the constant-current source be electrically connected with described C field coil, the integrated filtering be located in described microwave cavity resonate and steep and photocell and be located at the coupling loop of described microwave cavity afterbody, described integrated filtering resonance bubble and described photocell are all located in the light path of described spectroscopic lamp, and described integrated filtering resonance bubble is between described spectroscopic lamp and described photocell, described microwave cavity afterbody refers to the one end away from described spectroscopic lamp in described microwave cavity.
3. atomic frequency standard according to claim 2, is characterized in that, described photocell is the silicon photocell having the strongest ligh-induced effect at 800nm.
4. atomic frequency standard according to claim 3, is characterized in that, described spectroscopic lamp is electrodeless discharge lamp.
5. atomic frequency standard according to claim 3, it is characterized in that, described physical system also comprises: the first thermostat, the second thermostat and temperature control circuit, described temperature control circuit is electrically connected with described first thermostat and described second thermostat respectively, and described spectroscopic lamp and described resonant probe device are located in described first thermostat and described second thermostat respectively.
6. atomic frequency standard according to claim 5, is characterized in that, described physical system also comprises: magnetic cup, and described second thermostat is located in described magnetic cup.
7. atomic frequency standard according to claim 2, is characterized in that, described physical system also comprises slide rheostat Rk and fixed resistance R, and described slide rheostat Rk connects with described C field coil, and described fixed resistance R is in parallel with described slide rheostat Rk;
Described second processing unit, also for the resistance control C field current by changing described slide rheostat Rk.
8. the atomic frequency standard according to any one of claim 1-7, it is characterized in that, described atomic frequency standard also comprises: output module, for receiving the output frequency of described VCXO after the effect of correction voltage, and to described output frequency frequency division, obtain the frequency values that user needs.
9. atomic frequency standard according to claim 8, it is characterized in that, described output module comprises frequency divider, sinewave output unit and TTL (transistor transistor logic) TTL signal output unit, described frequency divider is used for carrying out frequency division to described VCXO output frequency, described sinewave output unit is used for the output frequency after described frequency division to export with sine wave, and described pipe transistor logic TTL signal output unit is used for the output frequency of sine wave being converted into TTL signal and exports.
10. atomic frequency standard according to claim 9, is characterized in that, described frequency divider is divide by four circuit.
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| CN107437940A (en) * | 2017-09-11 | 2017-12-05 | 江汉大学 | A kind of atomic frequency standard device |
| RU2782239C1 (en) * | 2021-12-30 | 2022-10-25 | Акционерное общество "Морион" | Quantum generator |
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Application publication date: 20150311 |