CN201937572U - Coherent population trapping (CPT) atomic clock servo circuit - Google Patents
Coherent population trapping (CPT) atomic clock servo circuit Download PDFInfo
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- CN201937572U CN201937572U CN2011200435823U CN201120043582U CN201937572U CN 201937572 U CN201937572 U CN 201937572U CN 2011200435823 U CN2011200435823 U CN 2011200435823U CN 201120043582 U CN201120043582 U CN 201120043582U CN 201937572 U CN201937572 U CN 201937572U
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Abstract
The utility model relates to a coherent population trapping (CPT) atomic clock servo circuit, which comprises a micro controller, wherein the signal input end of the micro controller is connected with a photoelectric detector of an atomic clock physical unit, the signal output end of the micro controller is connected with a laser of the atomic clock physical unit sequentially through a frequency signal output circuit and a frequency conversion stage circuit, the signal output end of a microcomputer controller is connected with the laser of the atomic clock physical unit through a constant current source circuit, and the signal input and output ends of the micro controller are respectively connected with a temperature control circuit and a magnetic filed monitoring circuit. The CPT atomic clock servo circuit uses the micro controller as a control core to be in charge of monitoring the temperature and the magnetic field, controlling digital devices, carrying out phase sensitive wave detection, generating square wave modulation signals and regulating and controlling constant current source current to realize the automatic scanning and locking control of the laser frequency and the microwave frequency. The CPT atomic clock servo circuit realizes the small size digitalization and the nearby control, the circuit implementation is simplified, the possibility of the signal interference is reduced, the cost is low, the stability is high, and the power consumption is little.
Description
Technical field
The utility model relates to a kind of CPT atomic clock servo circuit.
Background technology
Research to atomic clock mainly concentrates on two aspects: be to explore development accuracy and the higher atomic clock of stability on the one hand, in recent years, many different types of novel atomic clocks that possess higher accuracy and stability have successfully been developed, cold atom fountain clock for example, the ion trap clock, light clock etc.; Be the approach that positive searching realizes high-precision mini engineering atomic clock on the other hand, to satisfy the development need of various engineerings, for example develop small-sized satellite atomic clock, utilize the Miniaturized relevant population imprison atomic clock of relevant population imprison principle development.
Relevant population imprison (CPT, Coherent Population Trapping) is a kind of quantum interference phenomenon that atom and coherent light interaction produce, utilize the good coherence of laser, the relevant population imprison of preparation attitude in atom system, but and the chip passive type novel C PT atomic clock of realizing is the cutting edge technology of current atomic clock field and navigation field.Its advantage is: on the one hand, do not need microwave cavity, can obviously reduce volume; On the other hand, adopt the relevant bi-coloured light of laser preparation that is subjected to the microwave frequency modulation, can reduce optical frequency shift.Although the CPT atomic clock proposed so far time and soon from 1998, its development has demonstrated superior performance rapidly, and also has bigger room for improvement.
In practice, general CPT desktop experimental system is only pursued the convenience of transfer surveying, and does not consider volume and power problems, and miniature and even chip-scale CPT atomic clock is paid attention to reducing of volume and power consumption really very much, but is inconvenient to transfer survey.Up to the present the index that realizes the CPT atomic clock is not very high, and it is more serious to show that mainly temperature is floated phenomenon, and temperature control causes power consumption bigger, and the stability of atomic frequency standard output signal is all on the low side.
The utility model content
The purpose of this utility model is to provide the CPT atomic clock that a kind of cost is low, stability is high, power consumption is little servo circuit.
For achieving the above object, the utility model has adopted following technical scheme: a kind of CPT atomic clock servo circuit, comprise microcontroller, the signal input part of microcontroller links to each other with the photodetector of atomic clock physical location, the signal output part of microcontroller is successively by the frequency signal output circuit, the frequency transformation stage circuit links to each other with the laser of atomic clock physical location, the signal output part of microcomputerized controller links to each other with the laser of atomic clock physical location by the constant current source circuit, the signal input output end of microcontroller respectively with temperature control circuit, the magnetic field observation circuit links to each other.
As shown from the above technical solution, the utility model with microcontroller as control core, be responsible for control, phase sensitive detection, generation square-wave modulation signal, the regulation and control constant-current source electric current of monitoring temperature and magnetic field, digital device, realize automatic scan and locking control laser frequency and microwave frequency.The utility model has been realized small size digitlization and control nearby, has simplified the realization of circuit, has reduced the possibility that signal is interfered, and cost is low, stability is high, power consumption is little.
Description of drawings
Fig. 1 is a circuit block diagram of the present utility model.
Embodiment
A kind of CPT atomic clock servo circuit, comprise microcontroller 1, the signal input part of microcontroller 1 links to each other with the photodetector 2 of atomic clock physical location, the signal output part of microcontroller 1 links to each other with the laser 3 of atomic clock physical location by frequency signal output circuit, frequency transformation stage circuit successively, the signal output part of microcontroller 1 links to each other with the laser 3 of atomic clock physical location by the constant current source circuit, the signal input output end of microcontroller 1 links to each other with temperature control circuit, magnetic field observation circuit respectively, as shown in Figure 1.Described frequency signal output circuit adopts voltage-controlled temperature-compensating crystal oscillator 4, and described frequency transformation stage circuit adopts Direct Digital Synthesizer and phase-locked loop 5, and described constant current source circuit adopts constant-current source controller 6.
The atomic clock physical location is from laser 3 emission light signals, photodetector 2 receiving optical signals; The atomic clock servo circuit has comprised two locked loops: laser frequency stabilization loop and microwave frequency-locked loop, the effect of first loop is that wavelength locking with laser 3 is on atom D1 linear light transition spectral line, to guarantee the stable excitation of CPT, after this loop-locking, wherein two sidebands of laser spectroscopy will be aimed at the optical transition between two hyperfine energy levels of ground state and the excitation state respectively; The effect of second loop is that the microwave modulating frequency is locked on the CPT resonance frequency, to provide high performance frequency output signal.
As shown in Figure 1, described photodetector 2 links to each other with the input of first amplifier 7, the output of first amplifier 7 is respectively with first, two band-pass filter links to each other, described microcontroller 1 is by A/D converter, the phase-sensitive detection unit, square-wave frequency modulation unit and D/A converter are formed, first, two band-pass filter links to each other with the input of A/D converter respectively, the output of A/D converter links to each other with the input of phase-sensitive detection unit, the output of phase-sensitive detection unit links to each other with the input of D/A converter, the output of square-wave frequency modulation unit respectively with the frequency transformation stage circuit, the phase-sensitive detection unit links to each other with the constant current source circuit, the output of D/A converter by low pass filter respectively with second, three amplifiers 8,9 input links to each other.
In order to reduce workload, reduce cost and obtain the optimal demodulation effect, adopt the method for quadrature demodulation to carry out phase-sensitive detection; Earlier the two-way analog signal is sampled through A/D converter, digital signal that obtains and digital local oscillation signal multiply each other respectively, obtain homophase and digital orthogonal baseband signal respectively through the two-way low pass filter again, addition after carrying out respectively again square, carry out extracting operation again, add definite sign bit at last and provide final demodulation result.
As shown in Figure 1, described temperature control circuit comprises thermistor 10 and Peltier 11, thermistor 10 is arranged on the side of laser 3, rubidium bubble 16, Peltier 11 is close to the outer surface of atomic clock physical location, the outside filling with insulation material of atomic clock physical location, thermistor 10 links to each other with the signal input part of microcontroller 1, and the signal output part of microcontroller 1 links to each other with Peltier 11.Described magnetic field observation circuit comprises magnetoresistive transducer 13, and axial magnetic-field coil 12 is wrapped on the rubidium bubble 16, and magnetoresistive transducer 13 links to each other with the signal input part of microcontroller 1, and the signal output part of microcontroller 1 links to each other with axial magnetic-field coil 12.
Because atomic clock need be operated in the environment of constant low-intensity magnetic field, adopt current value on the high-precision A/D converter quantified controlling axial magnetic-field coil 12 to reach the purpose that changes constant low-intensity magnetic field, adopt small-sized, low-cost, highly sensitive magnetoresistive transducer 13 to carry out the magnetic field monitoring, to satisfy the requirement of system to the low-intensity magnetic field size.Because laser 3 and rubidium bubble 16 need temperature control, adopt the thermistor 10 of negative temperature coefficient to carry out temperature sensing, 11 pairs of lasers 3 of Peltier and rubidium bubble 16 carry out precision temperature control; Two Peltiers 11 are close to the outer surface of atomic clock physical location respectively, the outside filling with insulation material of atomic clock physical location.
As shown in Figure 1, the output of described second amplifier 8 links to each other with voltage-controlled temperature-compensating crystal oscillator 4, voltage-controlled temperature-compensating crystal oscillator 4 links to each other with phase-locked loop 5 with Direct Digital Synthesizer, Direct Digital Synthesizer links to each other with programmable digital power attenuator 14 with phase-locked loop 5, programmable digital power attenuator 14 links to each other with impedance matching circuit, impedance matching circuit links to each other with biasing device 15, and biasing device 15 links to each other with laser 3.The output of described the 3rd amplifier 9 links to each other with constant-current source controller 6, and constant-current source controller 6 links to each other with biasing device 15, and biasing device 15 links to each other with laser 3.
The technical scheme that adopts Direct Digital Synthesizer (DDS) and phase-locked loop (PLL) to combine provides atomic clock required microwave signal; Adopt phase noise, all good voltage-controlled temperature-compensating crystal oscillator 4 of humorous assorted inhibition to provide the frequency transformation stage circuit required reference source; For the consideration of practicability, obtain final high performance frequency standard signal through filtering and output buffering then.Adopt programmable digital power attenuator 14 to realize the microwave signal of any impulse form, can obtain more superior frequency discrimination curve, simplified the atomic clock structure, reduced optical frequency shift, optimized and improved the performance of atomic clock, finally improve its frequency stability.The atomic clock physical location can be regarded frequency reference as, and the generation of working frequency and the correction of frequency then can be seen in the servo circuit unit, in order to produce stable frequency output signal.
By the high-precision A/D converter of microcontroller 1 control, the direct current component that changes laser 3 operating currents is realized laser frequency scanning, and laser 3 outputs are subjected to the polychromatic light of microwave frequency modulation, and obtains absorption spectra after the effect of natural rubidium atom.For with the minimum point of laser frequency lock at maximum absorption band, the direct current component of the laser 3 supply currents low frequency that also superposeed is modulated by a small margin.The light detecting signal of photodetector 2 outputs makes signal amplitude reach OK range through first amplifier 7 earlier, take out the fundamental signal that needs through first and second band pass filter again, send into microcontroller 1 by the A/D converter collection again and carry out synchronous phase demodulation, thereby obtain the differential curve of absorption spectra, as the correction curve of locking laser frequency, finally make the locking of whole system closed loop.Realize the frequency lock of microwave loop by the voltage-controlled voltage of the voltage-controlled temperature-compensating crystal oscillator 4 of control with essentially identical method.
Claims (7)
1. CPT atomic clock servo circuit, it is characterized in that: comprise microcontroller (1), the signal input part of microcontroller (1) links to each other with the photodetector (2) of atomic clock physical location, the signal output part of microcontroller (1) is successively by the frequency signal output circuit, the frequency transformation stage circuit links to each other with the laser (3) of atomic clock physical location, the signal output part of microcontroller (1) links to each other with the laser (3) of atomic clock physical location by the constant current source circuit, the signal input output end of microcontroller (1) respectively with temperature control circuit, the magnetic field observation circuit links to each other.
2. CPT atomic clock servo circuit according to claim 1, it is characterized in that: described frequency signal output circuit adopts voltage-controlled temperature-compensating crystal oscillator (4), described frequency transformation stage circuit adopts Direct Digital Synthesizer and phase-locked loop (5), and described constant current source circuit adopts constant-current source controller (6).
3. CPT atomic clock servo circuit according to claim 1, it is characterized in that: described photodetector (2) links to each other with the input of first amplifier (7), the output of first amplifier (7) is respectively with first, two band-pass filter links to each other, described microcontroller (1) is by A/D converter, the phase-sensitive detection unit, square-wave frequency modulation unit and D/A converter are formed, first, two band-pass filter links to each other with the input of A/D converter respectively, the output of A/D converter links to each other with the input of phase-sensitive detection unit, the output of phase-sensitive detection unit links to each other with the input of D/A converter, the output of square-wave frequency modulation unit respectively with the frequency transformation stage circuit, the phase-sensitive detection unit links to each other with the constant current source circuit, the output of D/A converter by low pass filter respectively with second, three amplifiers (8,9) input links to each other.
4. CPT atomic clock servo circuit according to claim 1, it is characterized in that: described temperature control circuit comprises thermistor (10) and Peltier (11), thermistor (10) is arranged on the side of laser (3), rubidium bubble (16), Peltier (11) is close to the outer surface of atomic clock physical location, the outside filling with insulation material of atomic clock physical location, thermistor (10) links to each other with the signal input part of microcontroller (1), and the signal output part of microcontroller (1) links to each other with Peltier (11).
5. CPT atomic clock servo circuit according to claim 1, it is characterized in that: described magnetic field observation circuit comprises magnetoresistive transducer (13), axial magnetic-field coil (12) is wrapped on the rubidium bubble (16), magnetoresistive transducer (13) links to each other with the signal input part of microcontroller (1), and the signal output part of microcontroller (1) links to each other with axial magnetic-field coil (12).
6. according to claim 2 or 3 described CPT atomic clock servo circuits, it is characterized in that: the output of described second amplifier (8) links to each other with voltage-controlled temperature-compensating crystal oscillator (4), voltage-controlled temperature-compensating crystal oscillator (4) links to each other with phase-locked loop (5) with Direct Digital Synthesizer, Direct Digital Synthesizer links to each other with programmable digital power attenuator (14) with phase-locked loop (5), programmable digital power attenuator (14) links to each other with impedance matching circuit, impedance matching circuit links to each other with biasing device (15), and biasing device (15) links to each other with laser (3).
7. according to claim 2 or 3 described CPT atomic clock servo circuits, it is characterized in that: the output of described the 3rd amplifier (9) links to each other with constant-current source controller (6), constant-current source controller (6) links to each other with biasing device (15), and biasing device (15) links to each other with laser (3).
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011200435823U CN201937572U (en) | 2011-02-22 | 2011-02-22 | Coherent population trapping (CPT) atomic clock servo circuit |
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| CN2011200435823U CN201937572U (en) | 2011-02-22 | 2011-02-22 | Coherent population trapping (CPT) atomic clock servo circuit |
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| CN201937572U true CN201937572U (en) | 2011-08-17 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102075187A (en) * | 2011-02-22 | 2011-05-25 | 合肥威师智能电子电器厂 | Cpt atomic clock servo circuit |
| CN103326719A (en) * | 2013-05-31 | 2013-09-25 | 江汉大学 | Voltage controlled crystal oscillating device used in atomic frequency standard |
| CN103338036A (en) * | 2013-07-12 | 2013-10-02 | 西安电子科技大学 | Frequency signal link control method of atomic clock based on phase group treatment |
| CN104410410A (en) * | 2014-11-27 | 2015-03-11 | 江汉大学 | Pulse signal source device |
| CN105811972A (en) * | 2016-03-11 | 2016-07-27 | 清华大学 | Pulse-type coherent population atomic clock magnetic field servo system |
| RU195880U1 (en) * | 2019-12-12 | 2020-02-07 | Федеральное государственное бюджетное учреждение науки Институт лазерной физики Сибирского отделения Российской академии наук | Test bench for components of a discriminator of a frequency standard based on the effect of coherent population trapping |
| CN111044943A (en) * | 2019-12-24 | 2020-04-21 | 北京航天控制仪器研究所 | Multi-spectrum closed-loop locking method and system for CPT magnetometer |
-
2011
- 2011-02-22 CN CN2011200435823U patent/CN201937572U/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102075187A (en) * | 2011-02-22 | 2011-05-25 | 合肥威师智能电子电器厂 | Cpt atomic clock servo circuit |
| CN102075187B (en) * | 2011-02-22 | 2013-03-13 | 合肥威师智能电子电器厂 | Cpt atomic clock servo circuit |
| CN103326719A (en) * | 2013-05-31 | 2013-09-25 | 江汉大学 | Voltage controlled crystal oscillating device used in atomic frequency standard |
| CN103338036A (en) * | 2013-07-12 | 2013-10-02 | 西安电子科技大学 | Frequency signal link control method of atomic clock based on phase group treatment |
| CN103338036B (en) * | 2013-07-12 | 2016-04-13 | 西安电子科技大学 | Based on the frequency signal link control method of atomic clock of phase group process |
| CN104410410A (en) * | 2014-11-27 | 2015-03-11 | 江汉大学 | Pulse signal source device |
| CN104410410B (en) * | 2014-11-27 | 2017-09-01 | 江汉大学 | A kind of pulse signal source device |
| CN105811972A (en) * | 2016-03-11 | 2016-07-27 | 清华大学 | Pulse-type coherent population atomic clock magnetic field servo system |
| CN105811972B (en) * | 2016-03-11 | 2019-02-22 | 清华大学 | A kind of pulsed coherent layout Trapping of Atoms clock magnetic field servo-system |
| RU195880U1 (en) * | 2019-12-12 | 2020-02-07 | Федеральное государственное бюджетное учреждение науки Институт лазерной физики Сибирского отделения Российской академии наук | Test bench for components of a discriminator of a frequency standard based on the effect of coherent population trapping |
| CN111044943A (en) * | 2019-12-24 | 2020-04-21 | 北京航天控制仪器研究所 | Multi-spectrum closed-loop locking method and system for CPT magnetometer |
| CN111044943B (en) * | 2019-12-24 | 2022-04-19 | 北京航天控制仪器研究所 | Multi-spectrum closed-loop locking method and system for CPT magnetometer |
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Granted publication date: 20110817 Termination date: 20130222 |