CN104410416B - Coherent Population Trapping Trapping of Atoms frequency marking and the method for improving its short-term stability - Google Patents
Coherent Population Trapping Trapping of Atoms frequency marking and the method for improving its short-term stability Download PDFInfo
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Abstract
The invention discloses a kind of Coherent Population Trapping Trapping of Atoms frequency marking and the method for improving its short-term stability, belong to field of atomic frequency standard.The atomic frequency standard includes：VCXO；Linear polarization exciting unit, signal is sought for producing microwave according to the output frequency of VCXO；Physical location, the effect for seeking signal in microwave produce light inspection signal；Servo loop, synchronous phase discrimination signal is produced for synchronizing phase demodulation to light inspection signal；Control unit, VCXO is acted on for producing correction voltage according to synchronous phase discrimination signal；System relaxation time detecting unit, for detecting the system relaxation time Δ t of atomic frequency standard；Control unit, it is additionally operable to carry out SECO to the photoswitch in physical location and servo loop according to system relaxation time Δ t, after N number of Δ t time spans after the photoswitch in controlling physical location is opened, control servo loop synchronizes phase demodulation to light inspection signal caused by physical location.
Description
Technical field
The present invention relates to field of atomic frequency standard, more particularly to a kind of Coherent Population Trapping Trapping of Atoms frequency marking and to improve it short-term steady
Surely the method spent.
Background technology
Coherent Population Trapping imprison (English：Coherent Population Trapping, referred to as：CPT) atomic frequency standard is profit
A kind of quantum interference phenomenon caused by atom and coherent laser interaction and a kind of New type atom frequency marking for realizing, and
Unique atomic frequency standard that miniaturization can be achieved from principle, its volume, power consumption are wanted than Hydrogen Atom Frequency Standard, cesium atomic frequency standard at present
It is small, in addition compared with the minimum Rb atom frequency marking of current volume, power consumption it is also much smaller.
The principle of CPT atomic frequency standard is to obtain double-colored coherent laser to Laser Modulation using microwave to act on atom, when double
When the difference of chromatic coherent laser frequency is equal to two hyperfine energy level difference on the frequencies of ground state of atom, atom is prepared to CPT states and right
The absorption of light weakens, and laser intensity will obtain intensity maxima, i.e. electromagnetic induced transparency (English from the absorption spectra of atom pair laser
Text：Electromagnetically Induced Transparency, referred to as：EIT) spectral line, then using EIT spectral line conducts
Frequency discrimination spectral line goes to lock VCXO.CPT atomic frequency standard is mainly made up of two parts of electronic circuit and physical location.Electric wire
The effect on road is that the microwave for carrying modulation intelligence acted in laser seeks signal, and electronic circuit is also to physical location
The light inspection signal of the carrying frequency discrimination information of output synchronizes the synchronous phase discrimination signal of phase demodulation generation and acted on VCXO.Physics
The effect of unit is that the light inspection signal with frequency discrimination special efficacy is produced in the presence of microwave seeks signal.
During the present invention is realized, inventor has found that prior art at least has problems with：
When double-colored coherent laser and atom act on, a large amount of atoms accumulate in the hyperfine sub- energy level state of ground state, form polarization
Dark-state phenomenon and the preparation of CPT atomic states can not be participated in, and then influence CPT atomic frequency standard system signal noise ratio, be unfavorable for CPT original
The short-term stability of the system of sub- frequency marking.
The content of the invention
In order to solve problem of the prior art, the embodiments of the invention provide a kind of Coherent Population Trapping Trapping of Atoms frequency marking and carry
The method of its high short-term stability.The technical scheme is as follows：
On the one hand, the embodiments of the invention provide a kind of Coherent Population Trapping Trapping of Atoms frequency marking, the atomic frequency standard to include：
VCXO；
Linear polarization exciting unit, signal is sought for producing microwave according to the output frequency of the VCXO；
Physical location, double-colored coherent laser is produced under the modulating action for seeking signal in the microwave, it is described double-colored
Coherent laser produces light inspection signal with atom effect；The physical location includes semiconductor laser, is successively set on semiconductor
The wave plate of λ in the light path of laser/4, attenuator, resonant cavity and photoelectric detection system, the resonant cavity are included filled with alkali gold
Chamber bulb apparatus, coil and the magnetic screen of category and buffer gas, are provided between the semiconductor laser and the chamber bulb apparatus
Photoswitch；
Servo loop, synchronous phase discrimination signal is produced for synchronizing phase demodulation to the light inspection signal；
Control unit, the VCXO is acted on for producing correction voltage according to the synchronous phase discrimination signal；
System relaxation time detecting unit, for detecting the system relaxation time Δ t of the atomic frequency standard；
Described control unit, it is additionally operable to according to system relaxation time Δ t to the photoswitch in the physical location and described
Servo loop carries out SECO, after N number of Δ t time spans after the photoswitch in controlling the physical location is opened, control
Make the servo loop and phase demodulation is synchronized to light inspection signal caused by the physical location, N is the odd number more than 0.
In a kind of implementation of the embodiment of the present invention, the N is 3 or 5.
In another implementation of the embodiment of the present invention, the system relaxation time detecting unit includes：
Ring oscillator, for receiving the output signal of the servo loop, and by the output signal of the servo loop
Exported after anti-phase；
Subelement is performed, for being acted according to the output signal of the ring oscillator, is controlled in the physical location
The switch of photoswitch；
Detection sub-unit, for measuring the vibration week of the atomic frequency standard according to the output signal of the ring oscillator
Phase；
Subelement is obtained, for obtaining the cycle of oscillation of the ring oscillator；
Computation subunit, based on the cycle of oscillation according to the atomic frequency standard and the cycle of oscillation of the ring oscillator
Calculate the system relaxation time of the atomic frequency standard.
In another implementation of the embodiment of the present invention, the ring oscillator is made up of and described odd number NOT gate
NOT gate is at least 3.
In another implementation of the embodiment of the present invention, the computation subunit, for being calculated according to below equation
The system relaxation time of the atomic frequency standard：Δ t=(T1-T0)/2；
Wherein, Δ t is the system relaxation time, and T1 is the cycle of oscillation of the atomic frequency standard, and T0 is the ring oscillator
Cycle of oscillation.
In another implementation of the embodiment of the present invention, the photoswitch is high-speed shutter Shutter.
On the other hand, the embodiment of the present invention additionally provides a kind of raising Coherent Population Trapping Trapping of Atoms frequency marking short-term stability
Method, realize, methods described includes using the atomic frequency standard as described in any one of previous aspect：
Detect the system relaxation time Δ t of atomic frequency standard；
Microwave is produced using the output frequency of VCXO and seeks signal；
Double-colored coherent laser, the double-colored coherent laser and atom are produced in the case where the microwave seeks the modulating action of signal
Effect produces light inspection signal；
After N number of Δ t time spans after the photoswitch in controlling physical location is opened, control servo loop is to the thing
Light inspection signal caused by reason unit synchronizes phase demodulation, produces synchronous phase discrimination signal, and N is the odd number more than 0；
Correction voltage is produced according to the synchronous phase discrimination signal to act on the VCXO.
In a kind of implementation of the embodiment of the present invention, the N is 3 or 5.
In another implementation of the embodiment of the present invention, the system relaxation time Δ t of the detection atomic frequency standard, bag
Include：
The output signal of the servo loop is received using ring oscillator, and the output signal of the servo loop is anti-
Exported after phase；
Acted according to the output signal of the ring oscillator, control the switch of the photoswitch in the physical location；
The cycle of oscillation of the atomic frequency standard is measured according to the output signal of the ring oscillator；
Obtain the cycle of oscillation of the ring oscillator；
The atomic frequency standard is calculated according to the cycle of oscillation of the atomic frequency standard and the cycle of oscillation of the ring oscillator
The system relaxation time.
In another implementation of the embodiment of the present invention, cycle of oscillation according to the atomic frequency standard and described
The cycle of oscillation of ring oscillator calculates the system relaxation time of the atomic frequency standard, including：
The system relaxation time of the atomic frequency standard is calculated according to below equation：Δ t=(T1-T0)/2；
Wherein, Δ t is the system relaxation time, and T1 is the cycle of oscillation of the atomic frequency standard, and T0 is the ring oscillator
Cycle of oscillation.
The beneficial effect that technical scheme provided in an embodiment of the present invention is brought is：
By measuring the system relaxation time Δ t of atomic frequency standard, the then photoswitch and servo loop in physical location
When road carries out SECO, after N number of Δ t time spans after the photoswitch in controlling physical location is opened, servo loop is controlled
Road synchronizes phase demodulation to light inspection signal caused by physical location, that is, when adding the delay that phase demodulation is synchronized to light inspection signal
Between, because this time delay is N times of system relaxation time, and N is the odd number more than 0, so synchronizing phase demodulation
Before, system has accumulated which n times correction error, equivalent to an integrator is added in systems, i.e., introduces in systems
One noise；Because N is the odd number more than 0, N number of Δ t will also reach a millisecond magnitude, and other signals are typically just in system
String ripple (has even-order harmonic), and frequency generally can all be higher than 1MHz magnitudes, therefore the noise that sequential caused by N number of Δ t introduces
Will not impact other signals in system, therefore so doing can be improved the signal to noise ratio of system, so be advantageous to be
System short-term stability.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, make required in being described below to embodiment
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing.
Fig. 1 is the structural representation for the Coherent Population Trapping Trapping of Atoms frequency marking that the embodiment of the present invention one provides；
Fig. 2 is the schematic diagram of the cycle of oscillation for the ring oscillator that the embodiment of the present invention one provides；
Fig. 3 is the schematic diagram of the cycle of oscillation for the atomic frequency standard that the embodiment of the present invention one provides；
Fig. 4 is the stream of the method for the raising Coherent Population Trapping Trapping of Atoms frequency marking short-term stability that the embodiment of the present invention two provides
Cheng Tu；
Fig. 5 is photoswitch sequential provided in an embodiment of the present invention and synchronous phase demodulation timing diagram.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to embodiment party of the present invention
Formula is described in further detail.
Embodiment one
The embodiments of the invention provide a kind of Coherent Population Trapping Trapping of Atoms frequency marking, and referring to Fig. 1, the atomic frequency standard includes：
VCXO 101；
Linear polarization exciting unit 102, signal is sought for producing microwave according to the output frequency of VCXO；
Physical location 103, produces double-colored coherent laser under the modulating action for seeking signal in microwave, double-colored relevant to swash
Light produces light inspection signal with atom effect；
Servo loop 104, synchronous phase discrimination signal is produced for synchronizing phase demodulation to light inspection signal；
Control unit 105, VCXO is acted on for producing correction voltage according to synchronous phase discrimination signal；
System relaxation time detecting unit 106, for detecting the system relaxation time Δ t of atomic frequency standard；
Control unit 105, it is additionally operable to enter the photoswitch in physical location and servo loop according to system relaxation time Δ t
Row SECO, after N number of Δ t time spans after the photoswitch in controlling physical location is opened, control servo loop is to thing
Light inspection signal caused by reason unit synchronizes phase demodulation, and N is the odd number more than 0.
Specifically, SECO such as Fig. 5 institutes that control unit 105 is carried out to the photoswitch in physical location and servo loop
Show, synchronous phase demodulation sequential is compared with photoswitch sequential N number of Δ t times in evening.
Preferably, N can be 3 or 5.In an experiment, it can obtain when N takes 3 or 5 atomic frequency standard preferably short
Phase stability.
In embodiments of the present invention, linear polarization exciting unit 102 includes times mixing subelement and comprehensive subelement, for adopting
By the use of VCXO output frequency as reference signal, microwave is generated by microprocessor and digital frequency synthesizer and seeks signal.
In embodiments of the present invention, physical location 103 includes semiconductor laser, is successively set on semiconductor laser
The wave plate of λ in light path/4, attenuator, resonant cavity and photoelectric detection system, resonant cavity include gentle filled with alkali metal (such as rubidium)
Chamber bulb apparatus, coil and the magnetic screen of qi of chong channel ascending adversely body, photoswitch are located between semiconductor laser and chamber bulb apparatus.
In embodiments of the present invention, system relaxation time detecting unit 106 includes：
Ring oscillator 1061, for receiving the output signal of servo loop, and the output signal of servo loop is anti-phase
After export；
Subelement 1062 is performed, for being acted according to the output signal of ring oscillator, controls the light in physical location to open
The switch of pass；
Detection sub-unit 1063, for measuring the cycle of oscillation of atomic frequency standard according to the output signal of ring oscillator；
Subelement 1064 is obtained, for obtaining the cycle of oscillation of ring oscillator；
Computation subunit 1065, calculated for the cycle of oscillation according to atomic frequency standard and the cycle of oscillation of ring oscillator former
The system relaxation time of sub- frequency marking.
In embodiments of the present invention, ring oscillator 1061 is made up of odd number NOT gate and NOT gate is at least 3.In this reality
Apply in example, NOT gate can be occurred by microprocessor.
The input of ring oscillator 1061 receives the signal for coming from servo loop, the output end of ring oscillator 1061 feedback
On photoswitch into physical location, to control optical switch status ' opening ' or ' pass '.
Such as Fig. 2, odd number NOT gate is serially connected, and can produce self-oscillation, and the circuit forms a ring oscillator.If
The number M of NOT gate is odd number in ring oscillator, and the average transfer delay time of each not circuit is t, and ring oscillator produces
Raw cycle of oscillation is T0.It is assumed that the initial state of certain moment A1 point is ' 1 ', then after 1 transmission delay t, A2 points are changed into ' 0 ',
It is changed into ' 1 ' by 1 transmission delay t, A3 point again, after M transmission delay Mt of odd number, initial state ' 1 ' is changed into ' 0 '.Therefore, root
According to Fig. 2, can obtain：
T0=2Mt (1)
After ring oscillator seals in atomic frequency standard system, when the photoswitch in physical location is ' opening ' state, laser
The light of device excitation completes quantum frequency discrimination, produces light inspection signal by being directly entered after photoswitch in integrated resonance optical filtering bubble.Light is examined
Signal is after servo loop is handled, on the one hand for synchronous phase demodulation；On the other hand it is sent into ring oscillator.Because laser swashs
Integrated filtering resonance bubble can be passed through by encouraging light, so the moment produces the signal being sent into ring oscillator as high electricity through servo loop
Flat ' 1 ', and ring oscillator is made up of odd number NOT gate, therefore the signal being sent into ring oscillator is non-behind the door by odd number
Become low level ' 0 ', output signal acts on the photoswitch in physical location again, is ' pass ' state.Circulate successively,
The output end of ring oscillator occurs ' 1 ', ' 0 ', ' 1 ' ..., ' 0 ' change, is believed by the output end frequency of ring oscillator
Number detection, you can draw the cycle of oscillation T1 of atomic frequency standard.And according to formula (1) identical reason, it can be derived according to Fig. 3
The cycle of oscillation T1 of the atomic frequency standard can be expressed as：
T1=2 (Mt+ Δs t) (2)
Wherein, Δ t is the system relaxation time of atomic frequency standard.By formula (1) and (2), can be derived from：
Δ t=(T1-T0)/2 (3)
I.e. in embodiments of the present invention, computation subunit 1065, the system for calculating atomic frequency standard according to below equation
Relaxation time：Δ t=(T1-T0)/2；
Wherein, Δ t is the system relaxation time, and T1 is the cycle of oscillation of atomic frequency standard, and T0 is the vibration week of ring oscillator
Phase.
In embodiments of the present invention, photoswitch is high-speed shutter Shutter.
In embodiments of the present invention, control unit 105 can include microprocessor or programmable logic controller (PLC).
The embodiment of the present invention is by measuring the system relaxation time Δ t of atomic frequency standard, the then light in physical location
When switch and servo loop carry out SECO, the N Δ t time span after the photoswitch in controlling physical location is opened
Afterwards, control servo loop synchronizes phase demodulation to light inspection signal caused by physical location, that is, adds and light inspection signal is carried out together
The time delay of phase demodulation is walked, because this time delay is N times of system relaxation time, and N is the odd number more than 0, so
Before synchronizing phase demodulation, system has accumulated which N correction error, equivalent to an integrator is added in systems, that is, exists
A noise is introduced in system；Because N is odd number more than 0, N number of Δ t will also reach a millisecond magnitude, and other in system
Signal is typically sine wave (having even-order harmonic), and frequency generally can all be higher than 1MHz magnitudes, therefore when caused by N number of Δ t
The noise that sequence is introduced into will not impact other signals in system, therefore so doing can be improved the signal to noise ratio of system,
And then be advantageous to system short-term stability.
Embodiment two
The embodiment of the present invention additionally provides a kind of method for improving Coherent Population Trapping Trapping of Atoms frequency marking short-term stability, referring to
Fig. 4, this method include：
Step 201：Detect the system relaxation time Δ t of atomic frequency standard.
Specifically, step 201 can use following manner to realize：
Step 1: the output signal of servo loop is received using ring oscillator, and the output signal of servo loop is anti-
Exported after phase.
Step 2: being acted according to the output signal of ring oscillator, the switch of the photoswitch in physical location is controlled.
Step 3: the cycle of oscillation of atomic frequency standard is measured according to the output signal of ring oscillator.
Step 4: obtain the cycle of oscillation of ring oscillator.
Step 5: the system that atomic frequency standard is calculated according to the cycle of oscillation of atomic frequency standard and the cycle of oscillation of ring oscillator
Relaxation time.
More specifically, in step 5, the system relaxation time of atomic frequency standard can be calculated according to below equation：Δ t=
(T1-T0)/2。
Wherein, (Mt+ Δ t), Δ t are the system relaxation time to T1=2, and T1 is the cycle of oscillation of atomic frequency standard, and T0 is annular
The cycle of oscillation of oscillator, M are the number of NOT gate in ring oscillator, and t is the time delay of each NOT gate.
Step 202：Microwave is produced using the output frequency of VCXO and seeks signal.
Step 203：Double-colored coherent laser, double-colored coherent laser and atom are produced in the case where microwave seeks the modulating action of signal
Effect produces light inspection signal.
Specifically, step 203 is realized in the physical location of atomic frequency standard.
Step 204：After N number of Δ t time spans after the photoswitch in controlling physical location is opened, servo loop is controlled
Phase demodulation is synchronized to light inspection signal caused by physical location, produces synchronous phase discrimination signal, N is the odd number more than 0.
Specifically, the SECO carried out to the photoswitch in physical location and servo loop is as shown in figure 5, synchronous phase demodulation
Sequential is compared with photoswitch sequential N number of Δ t times in evening.
Step 205：Correction voltage is produced according to synchronous phase discrimination signal to act on VCXO.
In a kind of implementation of the embodiment of the present invention, N is 3 or 5.
The embodiment of the present invention is by measuring the system relaxation time Δ t of atomic frequency standard, the then light in physical location
When switch and servo loop carry out SECO, the N Δ t time span after the photoswitch in controlling physical location is opened
Afterwards, control servo loop synchronizes phase demodulation to light inspection signal caused by physical location, that is, adds and light inspection signal is carried out together
The time delay of phase demodulation is walked, because this time delay is N times of system relaxation time, and N is the odd number more than 0, so
Before synchronizing phase demodulation, system has accumulated which N correction error, equivalent to an integrator is added in systems, that is, exists
A noise is introduced in system；Because N is odd number more than 0, N number of Δ t will also reach a millisecond magnitude, and other in system
Signal is typically sine wave (having even-order harmonic), and frequency generally can all be higher than 1MHz magnitudes, therefore when caused by N number of Δ t
The noise that sequence is introduced into will not impact other signals in system, therefore so doing can be improved the signal to noise ratio of system,
And then be advantageous to system short-term stability.
It should be noted that：Above-described embodiment provide Coherent Population Trapping Trapping of Atoms frequency marking when improving short-term stability,
, can be as needed and by above-mentioned function distribution only with the division progress of above-mentioned each functional module for example, in practical application
Completed by different functional modules, i.e., the internal structure of equipment is divided into different functional modules, it is described above to complete
All or part of function.In addition, the Coherent Population Trapping Trapping of Atoms frequency marking that above-described embodiment provides is with improving Coherent Population Trapping imprison
The embodiment of the method for atomic frequency standard short-term stability belongs to same design, and its specific implementation process refers to embodiment of the method, here
Repeat no more.
The embodiments of the present invention are for illustration only, do not represent the quality of embodiment.
One of ordinary skill in the art will appreciate that hardware can be passed through by realizing all or part of step of above-described embodiment
To complete, by program the hardware of correlation can also be instructed to complete, described program can be stored in a kind of computer-readable
In storage medium, storage medium mentioned above can be read-only storage, disk or CD etc..
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc., it should be included in the scope of the protection.
Claims (10)
1. a kind of Coherent Population Trapping Trapping of Atoms frequency marking, it is characterised in that the atomic frequency standard includes：
VCXO；
Linear polarization exciting unit, signal is sought for producing microwave according to the output frequency of the VCXO；
Physical location, double-colored coherent laser is produced under the modulating action for seeking signal in the microwave, it is described double-colored relevant
Laser produces light inspection signal with atom effect；The physical location includes semiconductor laser, is successively set on semiconductor laser
The wave plate of λ in the light path of device/4, attenuator, resonant cavity and photoelectric detection system, the resonant cavity include filled with alkali metal and
Chamber bulb apparatus, coil and the magnetic screen of buffer gas, opened between the semiconductor laser and the chamber bulb apparatus provided with light
Close；
Servo loop, synchronous phase discrimination signal is produced for synchronizing phase demodulation to the light inspection signal；
Control unit, the VCXO is acted on for producing correction voltage according to the synchronous phase discrimination signal；
System relaxation time detecting unit, for detecting the system relaxation time Δ t of the atomic frequency standard；
Described control unit, it is additionally operable to according to system relaxation time Δ t to the photoswitch in the physical location and the servo
Loop carries out SECO, after N number of Δ t time spans after the photoswitch in controlling the physical location is opened, controls institute
State servo loop and phase demodulation is synchronized to light inspection signal caused by the physical location, N is the odd number more than 0.
2. atomic frequency standard according to claim 1, it is characterised in that the N is 3 or 5.
3. atomic frequency standard according to claim 1, it is characterised in that the system relaxation time detecting unit includes：
Ring oscillator, for receiving the output signal of the servo loop, and the output signal of the servo loop is anti-phase
After export；
Subelement is performed, for being acted according to the output signal of the ring oscillator, controls the light in the physical location to open
The switch of pass；
Detection sub-unit, for measuring the cycle of oscillation of the atomic frequency standard according to the output signal of the ring oscillator；
Subelement is obtained, for obtaining the cycle of oscillation of the ring oscillator；
Computation subunit, institute is calculated for the cycle of oscillation according to the atomic frequency standard and the cycle of oscillation of the ring oscillator
State the system relaxation time of atomic frequency standard.
4. atomic frequency standard according to claim 3, it is characterised in that the ring oscillator be made up of odd number NOT gate and
The NOT gate is at least 3.
5. atomic frequency standard according to claim 3, it is characterised in that the computation subunit, for according to below equation
Calculate the system relaxation time of the atomic frequency standard：Δ t=(T1-T0)/2；
Wherein, Δ t is the system relaxation time, and T1 is the cycle of oscillation of the atomic frequency standard, and T0 is shaking for the ring oscillator
Swing the cycle.
6. according to the atomic frequency standard described in claim any one of 1-5, it is characterised in that the photoswitch is high-speed shutter
Shutter。
A kind of 7. method for improving Coherent Population Trapping Trapping of Atoms frequency marking short-term stability, using any one of such as claim 1 to 6 institute
The atomic frequency standard stated is realized, it is characterised in that methods described includes：
Detect the system relaxation time Δ t of atomic frequency standard；
Microwave is produced using the output frequency of VCXO and seeks signal；
Double-colored coherent laser is produced in the case where the microwave seeks the modulating action of signal, the double-colored coherent laser acts on atom
Produce light inspection signal；
After N number of Δ t time spans after the photoswitch in controlling physical location is opened, control servo loop is to the physics list
Light inspection signal synchronizes phase demodulation caused by member, produces synchronous phase discrimination signal, and N is the odd number more than 0；
Correction voltage is produced according to the synchronous phase discrimination signal to act on the VCXO.
8. according to the method for claim 7, it is characterised in that the N is 3 or 5.
9. according to the method for claim 7, it is characterised in that the system relaxation time Δ t of the detection atomic frequency standard, bag
Include：
Receive the output signal of the servo loop using ring oscillator, and by the output signal of the servo loop it is anti-phase after
Output；
Acted according to the output signal of the ring oscillator, control the switch of the photoswitch in the physical location；
The cycle of oscillation of the atomic frequency standard is measured according to the output signal of the ring oscillator；
Obtain the cycle of oscillation of the ring oscillator；
According to the cycle of oscillation of the atomic frequency standard and the cycle of oscillation of the ring oscillator calculate the atomic frequency standard be
System relaxation time.
10. according to the method for claim 9, it is characterised in that the cycle of oscillation and institute according to the atomic frequency standard
The cycle of oscillation for stating ring oscillator calculates the system relaxation time of the atomic frequency standard, including：
The system relaxation time of the atomic frequency standard is calculated according to below equation：Δ t=(T1-T0)/2；
Wherein, Δ t is the system relaxation time, and T1 is the cycle of oscillation of the atomic frequency standard, and T0 is shaking for the ring oscillator
Swing the cycle.
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| CN106019179B (en) * | 2016-05-19 | 2018-09-18 | 北京航天控制仪器研究所 | A kind of quick locking method of CPT magnetometers |
| CN107846219A (en) * | 2017-10-27 | 2018-03-27 | 江汉大学 | A kind of modified CPT atomic state resonator systems |
| CN109856472B (en) * | 2018-12-13 | 2021-06-29 | 江汉大学 | Miniaturized fishpond fishing calibrating device based on multi-path detection signals |
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| CN101951261A (en) * | 2010-10-08 | 2011-01-19 | 中国科学院武汉物理与数学研究所 | All-digital servo gear of passive coherent population trapping atomic frequency standard |
| CN102291134A (en) * | 2011-06-02 | 2011-12-21 | 江汉大学 | Loop response time measuring device and method used for atomic frequency standard |
| CN103152039A (en) * | 2013-01-31 | 2013-06-12 | 江汉大学 | Method for reducing optical frequency shift of rubidium atom frequency scale |
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