CN203166871U - Improved atomic frequency standard servo system - Google Patents
Improved atomic frequency standard servo system Download PDFInfo
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- CN203166871U CN203166871U CN 201320039426 CN201320039426U CN203166871U CN 203166871 U CN203166871 U CN 203166871U CN 201320039426 CN201320039426 CN 201320039426 CN 201320039426 U CN201320039426 U CN 201320039426U CN 203166871 U CN203166871 U CN 203166871U
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Abstract
The utility model discloses an improved atomic frequency standard servo system and belongs to the atomic frequency standard field. The system comprises an amplification module, a synchronous phase-discrimination module, a temperature collection module, a temperature compensation module and a voltage-control conversion module, wherein the amplification module is electrically connected with a physical unit of atomic frequency standard and the synchronous phase-discrimination module respectively; the temperature collection module is electrically connected with a voltage-control crystal oscillator and the temperature compensation module respectively; and the voltage-control conversion module is electrically connected with the synchronous phase-discrimination module, the temperature compensation module and the voltage-control crystal oscillator respectively. The servo system provided by the utility model is used for converting a difference value of an operation ambient temperature and a reference operation temperature when the voltage-control crystal oscillator is in an operation state to voltage, and compensating the voltage to correction signals to obtain voltage-control voltage, the voltage-control voltage is applied on the voltage-control crystal oscillator, so that effects of the operation ambient temperature on output frequency of the voltage-control crystal oscillator are reduced, and the output frequency of the voltage-control crystal oscillator (namely output frequency of the atomic frequency standard) is relatively stable and accurate.
Description
Technical field
The utility model relates to the atomic frequency standard field, particularly a kind of improved atomic frequency standard servo system.
Background technology
The extensive use of digitlization integrated chip, for build the integrated level height, circuit module that precision is high provides prerequisite.In the atomic frequency standard servo circuit, all adopted DDS(Direct DigitalSynthesizer, Direct Digital Synthesizer both at home and abroad) and the processor of high integration finish the closed loop work of whole system.
In realizing process of the present utility model, the inventor finds that there is following problem at least in prior art:
In a concrete atomic frequency standard, because the output of VCXO can be subjected to influence of temperature variation, and the existing servo system of being formed by the processor of DDS and high integration, can't solve the problem that the output of the VCXO that variations in temperature brings changes, cause the atomic frequency standard output accuracy low.
The utility model content
In order to solve prior art problems, the utility model embodiment provides a kind of improved atomic frequency standard servo system.Described technical scheme is as follows:
The utility model embodiment provides a kind of improved atomic frequency standard servo system, and described system comprises:
The amplification module that the light inspection signal that is used for that the physical location of atomic frequency standard is exported amplifies;
Be used for the signal after the described amplification module amplification is carried out synchronous phase demodulation, obtain the synchronous phase demodulation module of deviation correcting signal;
The temperature collect module of the operating ambient temperature of VCXO when being used for obtaining atomic frequency standard work;
Be converted to the temperature compensation module of bucking voltage for the difference of the described operating ambient temperature that will get access to and reference work temperature;
Be used for adopting described bucking voltage that described deviation correcting signal is compensated, obtain voltage-controlled voltage, and described voltage-controlled voltage is acted on the voltage-controlled conversion module of described VCXO;
Wherein, described amplification module is electrically connected with physical location and the described synchronous phase demodulation module of described atomic frequency standard respectively, described temperature collect module is electrically connected with described VCXO and described temperature compensation module respectively, and described voltage-controlled conversion module is electrically connected with described synchronous phase demodulation module, described temperature compensation module and described VCXO respectively.
Wherein, described synchronous phase demodulation module comprises: for the analog to digital converter that the signal after the described amplification module amplification is gathered;
Be used for collection value and the reference signal of described analog to digital converter are carried out synchronous phase demodulation, obtain the processor of described deviation correcting signal;
Described analog to digital converter is electrically connected with described processor and described amplification module respectively, and described processor also is electrically connected with described voltage-controlled conversion module.
Wherein, described temperature collect module comprises thermistor Ra.
Wherein, described temperature compensation module comprises: the temperature conversion circuit that is converted to voltage difference for the difference of the described operating ambient temperature that described temperature collect module is got access to and reference work temperature;
Be used for that described voltage difference is carried out difference and amplify, be compensated first operational amplifier A of voltage;
The negative feedback resistor Rw that is used for the yield value of described first operational amplifier A of adjusting;
Wherein, described temperature conversion circuit is electrically connected with described temperature collect module, the input of described first operational amplifier A is electrically connected with described temperature conversion circuit, the output of described first operational amplifier A is electrically connected with described voltage-controlled conversion module, and described negative feedback resistor Rw is connected between the inverting input and output of described first operational amplifier A; Correspondingly, described processor also is electrically connected with described negative feedback resistor Rw, to regulate the yield value of described first operational amplifier A by the resistance of controlling described negative feedback resistor Rw.
Further, described temperature conversion circuit comprises electric bridge, described electric bridge comprises described thermistor Ra, resistance R 1 and two resistance R, and the resistance value of described resistance R 1 is corresponding with described reference work temperature, and the temperature coefficient of described resistance R 1 is identical with described thermistor Ra.
Wherein, described voltage-controlled conversion module comprises:
Be used for the voltage of described bucking voltage and described deviation correcting signal is sued for peace, obtain the summing circuit of described voltage-controlled voltage;
Be used for the digital to analog converter that the described voltage-controlled voltage of output acts on described VCXO;
Described summing circuit is electrically connected with described synchronous phase demodulation module and described temperature compensation module respectively, and described digital to analog converter is electrically connected with described summing circuit and described VCXO respectively.
Wherein, described amplification module comprises:
Be used for described light is examined the program control amplifying unit that signal gains and amplifies;
Described program control amplifying unit is electrically connected with physical location and the described synchronous phase demodulation module of described atomic frequency standard respectively, and correspondingly, described processor also is electrically connected with described program control amplifying unit, controls in order to the yield value to described program control amplifying unit.
Further, described program control amplifying unit comprises difference instrument amplifying circuit; Described difference instrument comprises second operational amplifier A 1 with amplifying circuit, the 3rd operational amplifier A 2, four-operational amplifier A3 and be used for to regulate the digital potentiometer Rk of described four-operational amplifier A3 yield value, described digital potentiometer Rk is connected between the inverting input and output of described four-operational amplifier A3, the in-phase input end of described four-operational amplifier A3 is electrically connected with the output of described second operational amplifier A 1, the inverting input of described four-operational amplifier A3 is electrically connected with the output of described the 3rd operational amplifier A 2, the in-phase input end of described second operational amplifier and described the 3rd operational amplifier is electrically connected with photocell in the described physical location, and the inverting input of described second operational amplifier and described the 3rd operational amplifier is connected by resistance R _ f.
The beneficial effect that the technical scheme that the utility model embodiment provides is brought is:
Operating ambient temperature when VCXO is worked and the difference of reference work temperature are converted to voltage, and this voltage compensation obtained voltage-controlled voltage in deviation correcting signal, again voltage-controlled voltage is acted on VCXO, reduced the influence of operating ambient temperature to the output frequency of VCXO, made that the frequency (being the output frequency of atomic frequency standard) of VCXO output is more stable and accurate.
Description of drawings
In order to be illustrated more clearly in the technical scheme among the utility model embodiment, the accompanying drawing of required use is done to introduce simply in will describing embodiment below, apparently, accompanying drawing in describing below only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of a kind of atomic frequency standard of providing of the utility model embodiment;
Fig. 2 is the improved atomic frequency standard servo system structure schematic diagram that the utility model embodiment provides;
Fig. 3 is the circuit diagram of temperature collect module and temperature compensation module in the improved atomic frequency standard servo system that provides of the utility model embodiment;
Fig. 4 is the circuit diagram of amplification module in the improved atomic frequency standard servo system that provides of the utility model embodiment.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing the utility model execution mode is described in further detail.
Following elder generation is simply introduced in conjunction with basic structure and the operation principle of the atomic frequency standard of Fig. 1.Only for giving an example, conduct is not to restriction of the present utility model for this structure.
As shown in Figure 1, atomic frequency standard comprises VCXO 1, isolated amplifier 2, microwave times frequency mixing module 3, physical location 4, comprehensive module 5 and servo system 6.Wherein, VCXO 1 is used for output original frequency signal; Isolated amplifier 2 is used for the output frequency signal of VCXO 1 being isolated and amplifying; Comprehensive module 5 is for generation of comprehensive modulation signal; Microwave times frequency mixing module 3 is used for the comprehensive modulation signal of the output signal of isolated amplifier 2 and comprehensive module 5 generations is carried out frequency multiplication and mixing simultaneously, to produce the microwave interrogation signals; Physical location 4 is used for the microwave interrogation signals is carried out frequency discrimination, produces light inspection signal; Servo system 6 produces correction voltage and acts on VCXO 1, to adjust the output frequency of VCXO 1 for light inspection signal being carried out frequency-selecting amplification and square wave shaping and carrying out synchronous phase demodulation with reference signal; By the said structure unit, the output frequency of VCXO 1 is locked on the hyperfine 0-0 centre frequency of atomic ground state the most at last.
Embodiment
The utility model embodiment provides a kind of improved atomic frequency standard servo system, and referring to Fig. 2, this system comprises:
The amplification module 201 that the light inspection signal that is used for that the physical location of atomic frequency standard is exported amplifies;
Be used for the signal after amplification module 201 amplifications is carried out synchronous phase demodulation, obtain the synchronous phase demodulation module 202 of deviation correcting signal;
The temperature collect module 203 of the operating ambient temperature of VCXO 200 when being used for obtaining atomic frequency standard work;
Be converted to the temperature compensation module 204 of bucking voltage for the difference of the operating ambient temperature that will get access to and reference work temperature;
Be used for adopting bucking voltage that deviation correcting signal is compensated, obtain voltage-controlled voltage, and voltage-controlled voltage is acted on the voltage-controlled conversion module 205 of VCXO 200;
Wherein, amplification module 201 is electrically connected with physical location and the synchronous phase demodulation module 202 of atomic frequency standard respectively, temperature collect module 203 is electrically connected with VCXO 200 and temperature compensation module 204 respectively, and voltage-controlled conversion module 205 is electrically connected with synchronous phase demodulation module 202, temperature compensation module 204 and VCXO 200 respectively.
Wherein, phase demodulation module 202 comprises synchronously: for the A/D(Analog to Digital Converter that the signal after amplification module 201 is amplified is gathered, analog to digital converter);
Be used for collection value and the reference signal of A/D are carried out synchronous phase demodulation, obtain the processor of deviation correcting signal;
A/D is electrically connected with processor and amplification module 201 respectively, and processor also is electrically connected with voltage-controlled conversion module 205.Phase demodulation is that prior art is not being given unnecessary details here synchronously.
Referring to Fig. 3, temperature collect module 203 comprises thermistor Ra.
Referring to Fig. 3, temperature compensation module 204 comprises: the temperature conversion circuit that is converted to voltage difference for the difference of the operating ambient temperature that temperature collect module 203 is got access to and reference work temperature;
Be used for that voltage difference is carried out difference and amplify, be compensated first operational amplifier A of voltage;
The negative feedback resistor Rw that is used for the yield value of adjusting first operational amplifier A;
Wherein, temperature conversion circuit is electrically connected with temperature collect module 203, the input of first operational amplifier A is electrically connected with temperature conversion circuit, the output of first operational amplifier A is electrically connected with voltage-controlled conversion module 205, and negative feedback resistor Rw is connected between the inverting input and output of first operational amplifier A; Correspondingly, processor also is electrically connected with negative feedback resistor Rw, to regulate the yield value of first operational amplifier A by the resistance of control negative feedback resistor Rw.
Further, temperature conversion circuit comprises electric bridge, and electric bridge comprises thermistor Ra, resistance R 1 and two resistance R, and the resistance value of resistance R 1 is corresponding with the reference work temperature, and the temperature coefficient of resistance R 1 is identical with thermistor Ra.
Particularly, temperature conversion circuit comprises electric bridge, and this electric bridge comprises thermistor Ra and the resistance R 1 that resistance value is corresponding with the reference work temperature, and the temperature coefficient of resistance R 1 is identical with thermistor Ra; Know that easily this electric bridge also comprises two resistance R.What the resistance of resistance R 1 was represented is the reference work temperature.Thermistor Ra is affixed on the surface of VCXO 200, the operating ambient temperature during in order to 200 work of perception VCXO.So when the operating ambient temperature no change of VCXO 200, electric bridge is in balance among Fig. 3.The operating ambient temperature of VCXO 200 raises (reduction), and then the resistance of thermistor Ra will diminish (becoming big), and there is voltage difference in the electric bridge two ends so.
Wherein, negative feedback resistor Rw can be digital potentiometer.
Wherein, voltage-controlled conversion module 205 comprises:
Be used for the voltage of bucking voltage and deviation correcting signal is sued for peace, obtain the summing circuit of voltage-controlled voltage;
Be used for the D/A(Digital to Analog Converter that the voltage-controlled voltage of output acts on VCXO 200, digital to analog converter);
Summing circuit is electrically connected with synchronous phase demodulation module 202 and temperature compensation module 204 respectively, and D/A is electrically connected with summing circuit and VCXO 200 respectively.
Know that easily the scope of A/D, D/A is not limited to the identical bits data sampling among the utility model embodiment, A/D, D/A also can be applicable to not coordination sampling; For example, when selecting 8 A/D and 10 D/A, then the least-significant byte that 8 general lines of A/D directly are connected to 10 D/A gets final product.
Further, amplification module 201 comprises:
Be used for light is examined the program control amplifying unit that signal gains and amplifies;
Program control amplifying unit is electrically connected with physical location and the synchronous phase demodulation module 202 of atomic frequency standard respectively, and correspondingly, processor also is electrically connected with program control amplifying unit, controls in order to the yield value to program control amplifying unit.
Referring to Fig. 4, program control amplifying unit comprises difference instrument amplifying circuit 2011.This difference instrument comprises second operational amplifier A 1 with amplifying circuit 2011, the 3rd operational amplifier A 2, four-operational amplifier A3 and be used for to regulate the digital potentiometer Rk of four-operational amplifier A3 yield value, digital potentiometer Rk is connected between the inverting input and output of four-operational amplifier A3, the in-phase input end of four-operational amplifier A3 is electrically connected with the output of second operational amplifier A 1, the inverting input of four-operational amplifier A3 is electrically connected with the output of the 3rd operational amplifier A 2, the in-phase input end of second operational amplifier and the 3rd operational amplifier is electrically connected with photocell, and second operational amplifier is connected by resistance R _ f with the inverting input of the 3rd operational amplifier.In atomic frequency standard, two photocells are positioned over cavity bubble system two sides of tail in the atomic frequency standard respectively, the photon of the light that photocell receiving spectrum lamp sends through irradiating behind the cavity bubble system, and form light inspection flashlight electric current I 1, I2.The light inspection signal I1 that photocell collects, I2 are delivered to second operational amplifier A 1, the 3rd operational amplifier A 2 after the impedance conversion in-phase input end.
Yield value in the program control amplifying unit is regulated by the resistance that processor changes digital potentiometer Rk, finally obtains appropriate signal and is transported to synchronous phase demodulation module 202.For each atomic frequency standard, because the VCXO model parameter difference of physical system and employing so need arrange at the yield value in the program control amplifying unit in each atomic frequency standard, finds the yield value that satisfies the real work requirement.Here yield value mainly is the voltage-controlled slope acquisition according to VCXO, and the magnitude of voltage that namely is applied on the VCXO causes the frequency change value.Voltage-controlled slope numerical value is that VCXO manufacturer provides, and is the reference frame that the programme-controlled gain size arranges.
The utility model embodiment when VCXO is worked operating ambient temperature and the difference of reference work temperature be converted to voltage, and this voltage compensation obtained voltage-controlled voltage in deviation correcting signal, again voltage-controlled voltage is acted on VCXO, reduced the influence of operating ambient temperature to the output frequency of VCXO, made that the frequency (being the output frequency of atomic frequency standard) of VCXO output is more stable and accurate.
The all or part of step that one of ordinary skill in the art will appreciate that realization above-described embodiment can be finished by hardware, also can instruct relevant hardware to finish by program, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium of mentioning can be read-only memory, disk or CD etc.
The above only is preferred embodiment of the present utility model, and is in order to limit the utility model, not all within spirit of the present utility model and principle, any modification of doing, is equal to replacement, improvement etc., all should be included within the protection range of the present utility model.
Claims (8)
1. improved atomic frequency standard servo system is characterized in that described system comprises:
The amplification module (201) that the light inspection signal that is used for that the physical location of atomic frequency standard is exported amplifies;
Be used for the signal after described amplification module (201) amplification is carried out synchronous phase demodulation, obtain the synchronous phase demodulation module (202) of deviation correcting signal;
The temperature collect module (203) of the operating ambient temperature of VCXO (200) when being used for obtaining atomic frequency standard work;
Be converted to the temperature compensation module (204) of bucking voltage for the difference of the described operating ambient temperature that will get access to and reference work temperature;
Be used for adopting described bucking voltage that described deviation correcting signal is compensated, obtain voltage-controlled voltage, and described voltage-controlled voltage is acted on the voltage-controlled conversion module (205) of described VCXO (200);
Wherein, described amplification module (201) is electrically connected with physical location and the described synchronous phase demodulation module (202) of described atomic frequency standard respectively, described temperature collect module (203) is electrically connected with described VCXO (200) and described temperature compensation module (204) respectively, and described voltage-controlled conversion module (205) is electrically connected with described synchronous phase demodulation module (202), described temperature compensation module (204) and described VCXO (200) respectively.
2. system according to claim 1 is characterized in that, described synchronous phase demodulation module (202) comprising: for the analog to digital converter that the signal after described amplification module (201) amplification is gathered;
Be used for collection value and the reference signal of described analog to digital converter are carried out synchronous phase demodulation, obtain the processor of described deviation correcting signal;
Described analog to digital converter is electrically connected with described processor and described amplification module (201) respectively, and described processor also is electrically connected with described voltage-controlled conversion module (205).
3. system according to claim 2 is characterized in that, described temperature collect module (203) comprises thermistor Ra.
4. system according to claim 3, it is characterized in that described temperature compensation module (204) comprising: the temperature conversion circuit that is converted to voltage difference for the difference of the described operating ambient temperature that described temperature collect module (203) is got access to and reference work temperature;
Be used for that described voltage difference is carried out difference and amplify, be compensated first operational amplifier A of voltage;
The negative feedback resistor Rw that is used for the yield value of described first operational amplifier A of adjusting;
Wherein, described temperature conversion circuit is electrically connected with described temperature collect module (203), the input of described first operational amplifier A is electrically connected with described temperature conversion circuit, the output of described first operational amplifier A is electrically connected with described voltage-controlled conversion module (205), and described negative feedback resistor Rw is connected between the inverting input and output of described first operational amplifier A; Correspondingly, described processor also is electrically connected with described negative feedback resistor Rw, to regulate the yield value of described first operational amplifier A by the resistance of controlling described negative feedback resistor Rw.
5. system according to claim 4, it is characterized in that, described temperature conversion circuit comprises electric bridge, described electric bridge comprises described thermistor Ra, resistance R 1 and two resistance R, the resistance value of described resistance R 1 is corresponding with described reference work temperature, and the temperature coefficient of described resistance R 1 is identical with described thermistor Ra.
6. system according to claim 1 is characterized in that, described voltage-controlled conversion module (205) comprising:
Be used for the voltage of described bucking voltage and described deviation correcting signal is sued for peace, obtain the summing circuit of described voltage-controlled voltage;
Be used for the digital to analog converter that the described voltage-controlled voltage of output acts on described VCXO (200);
Described summing circuit is electrically connected with described synchronous phase demodulation module (202) and described temperature compensation module (204) respectively, and described digital to analog converter is electrically connected with described summing circuit and described VCXO (200) respectively.
7. system according to claim 2 is characterized in that, described amplification module (201) comprising:
Be used for described light is examined the program control amplifying unit that signal gains and amplifies;
Described program control amplifying unit is electrically connected with physical location and the described synchronous phase demodulation module (202) of described atomic frequency standard respectively, correspondingly, described processor also is electrically connected with described program control amplifying unit, controls in order to the yield value to described program control amplifying unit.
8. system according to claim 7 is characterized in that, described program control amplifying unit comprises difference instrument amplifying circuit (2011); Described difference instrument comprises second operational amplifier A 1 with amplifying circuit (2011), the 3rd operational amplifier A 2, four-operational amplifier A3 and be used for to regulate the digital potentiometer Rk of described four-operational amplifier A3 yield value, described digital potentiometer Rk is connected between the inverting input and output of described four-operational amplifier A3, the in-phase input end of described four-operational amplifier A3 is electrically connected with the output of described second operational amplifier A 1, the inverting input of described four-operational amplifier A3 is electrically connected with the output of described the 3rd operational amplifier A 2, the in-phase input end of described second operational amplifier and described the 3rd operational amplifier is electrically connected with photocell in the described physical location, and the inverting input of described second operational amplifier and described the 3rd operational amplifier is connected by resistance R _ f.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320039426 CN203166871U (en) | 2013-01-24 | 2013-01-24 | Improved atomic frequency standard servo system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320039426 CN203166871U (en) | 2013-01-24 | 2013-01-24 | Improved atomic frequency standard servo system |
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| CN203166871U true CN203166871U (en) | 2013-08-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320039426 Expired - Fee Related CN203166871U (en) | 2013-01-24 | 2013-01-24 | Improved atomic frequency standard servo system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105446121A (en) * | 2015-12-10 | 2016-03-30 | 江汉大学 | Physical system |
| CN107979368A (en) * | 2017-12-20 | 2018-05-01 | 江汉大学 | The temperature control system of atomic frequency standard |
| CN108900166A (en) * | 2018-08-24 | 2018-11-27 | 西安陆海地球物理科技有限公司 | A kind of geophone sensitivity temperature-compensating adjusting circuit |
-
2013
- 2013-01-24 CN CN 201320039426 patent/CN203166871U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105446121A (en) * | 2015-12-10 | 2016-03-30 | 江汉大学 | Physical system |
| CN107979368A (en) * | 2017-12-20 | 2018-05-01 | 江汉大学 | The temperature control system of atomic frequency standard |
| CN107979368B (en) * | 2017-12-20 | 2021-08-31 | 江汉大学 | Temperature control system of atomic frequency standard |
| CN108900166A (en) * | 2018-08-24 | 2018-11-27 | 西安陆海地球物理科技有限公司 | A kind of geophone sensitivity temperature-compensating adjusting circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130828 Termination date: 20140124 |