CN1159851C - High accuracy atom frequency marker intelligent compensating method and its device - Google Patents
High accuracy atom frequency marker intelligent compensating method and its device Download PDFInfo
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- CN1159851C CN1159851C CNB001146076A CN00114607A CN1159851C CN 1159851 C CN1159851 C CN 1159851C CN B001146076 A CNB001146076 A CN B001146076A CN 00114607 A CN00114607 A CN 00114607A CN 1159851 C CN1159851 C CN 1159851C
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Abstract
The present invention discloses a method for intelligently compensating high-precision atomic frequency standards and a device thereof, which belongs to an atomic frequency standard technique and aims to improve the temperature characteristic and the aging drift characteristic of frequency standards. In the method, the temperature characteristic and the aging drift characteristic of atomic frequency standards are measured after the atomic frequency standards are compared with an external standard frequency source, and characteristic data is stored into a microprocessor and compensated in the process of work. The device of the present invention introduces compensation units and is composed of a detector, a microprocessor and a digital interface. Because of high cost performance, the present invention has a wide application perspective.
Description
The present invention relates to the atomic frequency standard technology, relate in particular to based on atomic frequency standard technology microprocessor, the band intelligent compensation.
Frequency marking, i.e. frequency standard.Any frequency marking all based on uniform periodic phenomena, promptly requires the stable as far as possible and periodic signal accurately of one of output.
Atomic frequency standard, i.e. atomic frequency standard with high stability, the high accuracy of its output frequency, has tremendous influence to the development of modern science and technology, has obtained in numerous fields to use widely.But the frequency of atomic frequency standard also can the fluctuating of factor such as be penetrated along with temperature, vibration, impact and the width of cloth of environment and be changed.For example, As time goes on Rb atom frequency marking exists the phenomenon of frequency aging drift always.How to reduce the sensitivity that atomic frequency standard rises and falls to environmental factor (main finger ring border temperature), and the aging drift of reduction frequency is an important topic that needs to be resolved hurrily always.Atomic frequency standard generally all is made up of quantum unit and control unit two parts; The critical piece of quantum unit is optical pumping spectrum lamp (abbreviation spectroscopic lamp) and absorbs bubble.Discover that the gas that the temperature characterisitic of frequency marking complete machine and aging drift characteristic are mainly steeped by the spectroscopic lamp and the absorption of quantum unit fills the system parameter and fills system technology and determines.In existing atomic frequency standard, improve two above-mentioned indexs, be to fill the system parameter and fill system technology by improving it, again to spectroscopic lamp with absorb bubble and preferably realize, not only complex process, cost are higher for this, and consistency of product is difficult to guarantee.
Purpose of the present invention just is to overcome the problem and shortage that prior art exists, and seeks a kind of new technology of improving its temperature characterisitic and aging drift characteristic, promptly proposes a kind of method and device thereof of intelligent compensation.
The object of the present invention is achieved like this.Its compensation method is: at first by the comparison of frequency marking and external perimysium reference frequency source, record the temperature characterisitic and the aging drift characteristic of the atomic frequency standard that will be compensated.Then, the data with these characteristics are deposited in the microprocessor.In the course of work of atomic frequency standard, microprocessor is carried out one section instruction termly, compensates according to the temperature characterisitic and the aging drift characteristic of the performance data that pre-deposits to atomic frequency standard.Its compensation arrangement is: introduce compensating unit on traditional atomic frequency standard basis, compensating unit is made up of detector, microprocessor, digital interface.
Describe in detail below in conjunction with accompanying drawing phase embodiment:
Fig. 1 is this principle of device block diagram,
Fig. 2 is this device intelligent compensation circuit diagram,
Fig. 3 is the temperature-compensating program diagram,
Fig. 4 is aging drift compensation program diagram,
Fig. 5 is digital interface control program figure,
Fig. 6 is this device appearance figure.
Wherein: A-quantum unit, B-control unit, C-compensating unit; 1-spectroscopic lamp (optical pumping spectrum lamp), the 2-bubble that filters, the 3-magnetic screen, the 4-C field coil, 5-absorbs bubble, 6-microwave cavity (microwave cavity), the 7-photocell, 8-amplifier, 9-phase-sensitive detector, the 10-integrator, 11-crystal resonator (VCXO), 12-frequency synthesizer, the 13-frequency multiplier, 14-low frequency modulations device, 15-detector, 15.1-temp probe, 15.2-A-D converter, 16-microprocessor, the 17-digital interface, 18-timer 0 interrupts the 19-thermometric, 20-proofreaies and correct frequency-temperature coefficient, and 21-interrupts returning, and 22-timer 1 interrupts, the 23-counting, 24-count down to set point, and 25-revises frequency aging, 26-interrupts returning, and the 27-serial is interrupted, and 28-accepts instruction, 29-analyzes and execution command, and 30-interrupts returning together, the 31-shell, the input of 32-power supply, the output of 33-standard frequency.
As shown in Figure 1, this device adds that by traditional atomic frequency standard (quantum unit A, control unit B) compensating unit C forms.Be the operation principle that example at first illustrates traditional atomic frequency standard with bubble type Rb atom frequency marking below:
Quantum unit A by spectroscopic lamp 1, the bubble 2 that filters, magnetic screen 3, C field coil 4,
87Rb absorbs bubble 5, microwave cavity 6, photocell 7 compositions.Control unit B is made up of amplifier 8, phase-sensitive detector 9, integrator 10, crystal resonator 11, frequency synthesizer 12, frequency multiplier 13, low frequency modulations device 14.The quantum reference frequency of Rb atom frequency marking is
87The meticulous jump frequency of the ground state of Rb atom (being called for short the atomic transition frequency) f
AThe light that spectroscopic lamp 1 sends is radiated on the photocell 7 then by being positioned over the absorption bubble 5 in the microwave cavity 6.Because the effect of atomic transition is the microwave frequency (mf of the detectable signal of input microwave cavity 6 by the light intensity that absorbs bubble 5
o-f
z) function.As input microwave frequency (mf
o-f
z) just in time equal the atomic transition frequency f
AThe time, the light that spectroscopic lamp 1 sends is absorbed the most doughtily, and the light intensity that is radiated on the photocell 7 will become the most weak.The effect of frequency synthesizer 12 is exactly the frequency that produces a magnetic tape trailer number, is about 5.3125 ... MHz, the output frequency mf of this frequency and frequency multiplier 13
oThe phase mixing is the microwave frequency (mf that imports microwave cavity 6
o-f
z), be about 6834.6875MHz.Simultaneously, also to carry out the low frequency modulations of frequency to detectable signal.Like this, the output of photocell 7 get final product restituted signal, this restituted signal is exaggerated device 8 and amplifies, and through phase-sensitive detector 9 detections, pass through integrator 10 integrations again after, promptly export the output frequency f that a dc error signal is proofreaied and correct crystal resonator 11
oBy this process, output frequency f
oJust being locked in the quantum reference frequency is the atomic transition frequency f
AOn, thereby obtain higher stable degree and accuracy.But output frequency f
oExist the dependence with environment and time, the output frequency f of promptly traditional atomic frequency standard
oWill be along with the variation of ambient temperature and the lengthening of operating time and change.
Compare with traditional atomic frequency standard, this device is to have introduced a compensating unit C, and compensating unit C is made up of detector 15, microprocessor 16, digital interface device 17.Output f by microprocessor 16 control synthesizers 12
zThereby, finish atomic frequency standard output frequency f
oTemperature and the compensation of aging drift.
In order to express easily, set following symbol:
f
A-atomic transition frequency;
f
A(T)-the temperature variant function of atomic transition frequency;
f
A(t)-the aging in time function that drifts about of atomic transition frequency;
f
o-atomic frequency standard output frequency;
f
o(T)-the temperature variant function of atomic frequency standard output frequency;
f
o(t)-the aging in time function that drifts about of atomic frequency standard output frequency;
f
z-be the output frequency of frequency synthesizer 12.
After atom frequency standard locking, there is following relational expression:
f
A＝mf
o-f
z (1)
M is the multiplying power of frequency multiplier 13.
Therefore:
f
A(T)＝mf
o(T)-f
z (2)
f
A(t)＝mf
o(t)-f
z (3)
Before atomic frequency standard of the present invention is worked first, must measure its two characterisitic functions.First is a temperature characterisitic of determining it, the secondth, and its aging drift characteristic.In the first step is measured, can determine f
o(T), i.e. the temperature variant function of atomic frequency standard output frequency.Second step was an aging drift rate of determining atomic frequency standard.For atomic frequency standard, this time process need several months.By the accumulation of data, can obtain function f by fitting of a polynomial or least square fitting
o(t).
Through feature measurement, microprocessor 16 has obtained the temperature of atomic frequency standard and the data of aging drift characteristic, obtains the temperature of atomic frequency standard and the function curve of aging drift characteristic by the analysis to data again.Can obtain f according to (2), (3) two formulas
A(T) and f
A(t), be used for the compensation of work.In the course of work of this atom frequency marking, microprocessor 16 is regularly measured ambient temperature and operating time, and according to the function that pre-deposits, temperature and the aging frequency change that causes of drifting about is sued for peace, and calculates the frequency values f that synthesizer 12 should be exported
z(T t), thereby makes the output frequency f of atomic frequency standard of the present invention
oRemain unchanged.
The output frequency of frequency synthesizer 12 is determined by following formula:
f
z(T，t)＝f
z(T
o，t
o)-[f
A(T)-f
A(T
o)]-[f
A(t)-f
A(t
o)] (4)
In the formula:
t＞t
o
t
oIt is the previous calibration time of atomic frequency standard of the present invention.
T
oAmbient temperature when being the previous calibration of atomic frequency standard of the present invention.
In the equation (4), f
z(T
o, t
o) value of setting of synthesizer 12 when being previous calibration.[f
A(T)-f
A(T
o)] difference on the frequency introduced of the variation of ambient temperature that calculates of the temperature characteristics that is microprocessor 16 by storage.[f
A(t)-f
A(t
o)] be aging drift characteristic according to atomic frequency standard calculate according to after the previous calibration, the difference on the frequency that passage of time is introduced.
In fact, equation (4) can just not comprise the difference on the frequency that temperature and aging drift cause.The difference on the frequency that other environmental parameter changes the atomic frequency standard of (for example air pressure, acceleration, radiation, vibrations) introducing also can be included into equation (4), compensates by same method then.
As can be seen, every in the equation (4) is considered to separate, and promptly ambient temperature can be ignored over time to the influence and the ambient temperature characteristic of aging drift rate.If for certain atomic frequency standard influencing each other and to ignore between the two, then only need in equation (4), to add one in addition and represent that this effect gets final product.
As seen from Figure 1, Figure 2, for traditional atomic frequency standard is compensated, this compensating unit C is made up of detector 16, microprocessor 16, digital interface 17.Microprocessor 16 is connected with frequency synthesizer 12, detector 15, the digital interface 17 of control unit B respectively.
As shown in Figure 2, among this device embodiment, microprocessor 16 is 8751, and frequency synthesizer 12 is that AD7008 A-D converter (A/D) 15.2 is ADC0808, and temp probe 15.1 is AD590.Microprocessor 16 and frequency synthesizer 12 clock signal as them is delivered in the output of crystal resonator 11 respectively, after the output of the output of frequency synthesizer 12 and frequency multiplier 13 mixes as the microwave sounding signal of quantum leap.The data/address bus PO mouth of microprocessor 16 is connected to the data/address bus D7:D0 while of the data/address bus D7:D0 and the A-D converter 15.2 of frequency synthesizer 12 simultaneously, and the control line that the P2 mouth of microprocessor 16 connects frequency synthesizer 12 and A-D converter 15.2 respectively provides control signal.
As Fig. 3, the frequency compensation that 16 pairs of variations in temperature of microprocessor are carried out is carried out in the interrupt service routine of timer 0, the temperature-compensating program be timer 0 interrupt 18 → thermometric 19 → to frequency-temperature coefficient revise 20 → interrupt returning 21.
As Fig. 4, the compensation of aging drift is finished in the interrupt service routine of timer 1, the frequency aging compensation program be timer 1 interrupt 22 → counting 23 → count down to set point 24 (being) → to frequency aging revise 25 → interrupt returning 26; Count down to set point 24 (denying) → interruption and return 26.
As Fig. 5, digital interface is by serial port interrupt service routine control, digital control program be serial interrupt 27 → accept instruction 28 → analyze and execute instruction 29 → interrupt returning 30.
Output current and the absolute temperature of temperature detecting head AD590 are directly proportional, and this electric current is converted to correspondent voltage and is converted to digital quantity through analog to digital converter 15.2 through resistance R, are gathered by microprocessor 16 controls.
In the time need revising, only need to increase corresponding detector 1 and get final product the fluctuating of other environmental variances beyond the temperature.Corresponding detector promptly is connected with A-D converter 15.2 by corresponding probe 15.1 and forms.The output frequency fz of frequency synthesizer 12 is subjected to microprocessor 16 controls, carries out the frequency correction according to the temperature of corresponding time and detection.Simultaneously, by the serial digital interface 17 of outside, microprocessor 16 also can be accepted outside control command, and the output frequency of frequency synthesizer 12 is revised.
Compared with prior art, namely compare with traditional atomic frequency standard, the present invention has the following advantages:
1. improve the temperature characterisitic of atomic frequency standard, simplify technological requirement, reduce machine volume and the perseverance of atomic frequency standard The temperature power consumption.
2. improve the aging drift characteristic of atomic frequency standard, reduce the complex manufacturing degree, prolong having of atomic frequency standard Imitate service time.
3. under the prerequisite that improves the atomic frequency standard precision, reduce the debugging complexity of atomic frequency standard.
Because therefore ratio of performance to price height of the present invention has a wide range of applications.
Claims (2)
1, a kind of high accuracy atom frequency marker intelligent compensation arrangement comprises quantum unit (A) and control unit (B); Quantum unit (A) by spectroscopic lamp (1), filter bubble (2), magnetic screen (3), C field coil (4),
87Rb absorbs bubble (5), microwave cavity (6), photocell (7) is formed; Control unit (B) goes out amplifier (8), phase-sensitive detector (9), integrator (10), crystal resonator (11), frequency synthesizer (12), frequency multiplier (13), low frequency modulations device (14) composition;
It is characterized in that:
1. in traditional atomic frequency standard of forming by quantum unit (A) and control unit (B), introduce compensating unit (C); Compensating unit (C) is made up of detector (15), microprocessor (16), digital interface (17); Microprocessor (16) is connected with the frequency synthesizer (12) of detector (15), digital interface (17), control unit (B) respectively;
2. detector (15) is made up of corresponding probe and A-D converter (15.2) and is interconnected.
2, by the described a kind of high accuracy atom frequency marker intelligent compensation arrangement of claim 1, it is characterized in that:
Microprocessor (16) selects 8751 for use, and frequency synthesizer (12) is selected AD7008 for use, and A-D converter (15.2) is selected ADC0808 for use, and temp probe (15.1) is selected AD590 for use; The data/address bus P0 of microprocessor (16) is connected to the data/address bus D7:D0 of frequency synthesizer (12) and the data/address bus D7:D0 of A-D converter (15.2) simultaneously; Simultaneously, the P2 mouth of microprocessor (16) connects the control line of frequency synthesizer (12) and A-D converter (15.2) respectively.
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|---|---|---|---|
| CNB001146076A CN1159851C (en) | 2000-06-01 | 2000-06-01 | High accuracy atom frequency marker intelligent compensating method and its device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001146076A CN1159851C (en) | 2000-06-01 | 2000-06-01 | High accuracy atom frequency marker intelligent compensating method and its device |
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| CN1159851C true CN1159851C (en) | 2004-07-28 |
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Cited By (1)
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|---|---|---|---|---|
| CN103326719A (en) * | 2013-05-31 | 2013-09-25 | 江汉大学 | Voltage controlled crystal oscillating device used in atomic frequency standard |
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| CN101079633B (en) * | 2007-05-17 | 2011-05-18 | 江汉大学 | Improved passive Rb atomic frequency standard servo control method and servo control circuit |
| CN101562451B (en) * | 2009-05-27 | 2012-07-25 | 西安华伟电力电子技术有限责任公司 | Precise domestication conserving method of second-level frequency scale |
| CN102122958B (en) * | 2011-02-21 | 2013-01-16 | 江汉大学 | Device and method for automatically repairing rubidium atom frequency-standard frequency drift |
| CN102201811B (en) * | 2011-05-30 | 2013-01-16 | 江汉大学 | Method and device for reducing microwave power frequency shift of atomic frequency standard |
| CN102761334A (en) * | 2012-07-18 | 2012-10-31 | 北京无线电计量测试研究所 | Intelligent compensation device and method for temperature coefficient of rubidium atomic frequency standard |
| CN102931986B (en) * | 2012-10-29 | 2015-09-02 | 江汉大学 | A kind of method and apparatus reducing temperature coefficient and atomic frequency standard is affected |
| CN102928708A (en) * | 2012-10-30 | 2013-02-13 | 江汉大学 | Method and device for measuring temperature coefficient of atomic frequency standard |
| CN103067003B (en) * | 2012-12-17 | 2015-04-01 | 江汉大学 | Self-tuning maser cavity |
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2000
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326719A (en) * | 2013-05-31 | 2013-09-25 | 江汉大学 | Voltage controlled crystal oscillating device used in atomic frequency standard |
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| CN1327305A (en) | 2001-12-19 |
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