CN202998067U - Frequency standard based on two microwave detection systems - Google Patents
Frequency standard based on two microwave detection systems Download PDFInfo
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- CN202998067U CN202998067U CN 201220701219 CN201220701219U CN202998067U CN 202998067 U CN202998067 U CN 202998067U CN 201220701219 CN201220701219 CN 201220701219 CN 201220701219 U CN201220701219 U CN 201220701219U CN 202998067 U CN202998067 U CN 202998067U
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Abstract
The utility model discloses a frequency standard based on two microwave detection systems. The frequency standard comprises a central processor, a first closed loop locking module, a second closed loop locking module, a voltage controlled enablement module and a physical control unit used for providing atomic resonance absorption lines. The first closed loop locking module is connected with the physical control unit and the central processor in order. The second closed loop locking module is connected with the physical control unit and the central processor in order, and is also connected with an external user terminal. One end of the voltage controlled enablement module is connected with the central processor and the other end of the voltage controlled enablement module is connected with the second closed loop locking module. Integration filtering resonance absorption bubbles that are completely the same in terms of performance are disposed in the physical control unit, and two microwave excitation structures are established, thereby realizing closed loop locking of a whole atomic frequency standard system. Moreover, the voltage controlled enablement module is adopted to control a second voltage controlled crystal oscillator, thereby overcoming jump influence, caused by changes of an external environment, upon output signal frequency of a whole machine in terms of the atomic frequency standard technology.
Description
Technical field
The utility model belongs to the Technology of Atomic Frequency Standards field, and is particularly a kind of based on two microwave detection system frequency markings.
Background technology
Atomic frequency standard is with the Stability index of its superelevation, be applied in such as satellite navigation, the time many Field of Time and Frequency such as base time service, time synchronized, national defense and military.Consider the specific requirement of above-mentioned application, especially the harsh requirement of field work to environment, the external environment that atomic frequency standard is changeable, especially working temperature environment, and the existence of atomic frequency standard system temperature coefficient always is the problem of this field researcher research, the variation of ambient temperature will cause the variation of the core component working temperatures such as internal system lamp temperature, chamber temperature, further cause the unstable of atomic hyperfine 0-0 jump frequency, finally affect the stability of system frequency output.For overcoming the system temperature coefficient to the impact of frequency stability index, present most of technology is by atomic frequency standard being inserted in the environment of constant temperature, its temperature controlling range can less than 0.1 ℃, can be improved the variation of ambient temperature to the impact of system index like this.But not necessarily cause due to internal physical system link when saltus step appears in atomic clock, we need within it that section arranges the steady index of length that certain automatic detecting structure improves complete machine.
The utility model content
Technical problem to be solved in the utility model is to provide a kind of based on two microwave detection system frequency markings, can realize frequently overcoming the saltus step impact that the external environment variation produces the complete machine output signal frequency in technology at the atom mark.
For solving the problems of the technologies described above, it is a kind of based on two microwave detection system frequency markings that the utility model provides, and comprising: central processing unit, the first closed loop locking module, the second closed loop locking module, voltage-controlled enable module reach the physical control unit that is used for providing the atomic resonance Absorption Line; Described the first closed loop locking module is connected with described physical control unit, described central processing unit successively; Described the second closed loop locking module is connected with described physical control unit, described central processing unit successively, is connected with extraneous user side simultaneously; Described voltage-controlled enable module one end is connected with described central processing unit, and the other end is connected with described the second closed loop locking module.
Further, described the first closed loop locking module comprises: first servo, the first VCXO, the first microwave radio circuit; Described first servoly is connected with described central processing unit, described the first microwave radio circuit, described the first VCXO, described physical control unit successively; Described the first microwave radio circuit is connected with described physical control unit, described the first VCXO successively; Described the first VCXO is connected with described central processing unit.
Further, described the second closed loop locking module comprises: second servo, the second VCXO, the second microwave radio circuit; Described second servoly is connected with described central processing unit, described the second microwave radio circuit, described physical control unit successively; Described the second microwave radio circuit is connected with described physical control unit, described the second VCXO successively; Described the second VCXO is connected with described central processing unit by described voltage-controlled enable module, is connected with extraneous user side simultaneously.
Further, described physical control unit comprises: optical pumping spectrum lamp, resonant probe unit, microwave source; Described optical pumping spectrum lamp is by the radio frequency source excitation luminescence; Described resonant probe unit is connected with described microwave source.
Further, described optical pumping spectrum lamp is the rubidium lamp of electrodless discharge, also is filled with gas M in its bulb.
Further, described resonant probe unit comprises: microwave cavity, field coil, at least one coupling loop, integrated filtering resonance unit, at least one photocell, constant temperature unit, magnetic cup unit; It is inner that described integrated filtering resonance unit is placed in described microwave cavity; Described integrated filtering resonance unit carries out the signal transmission by described coupling loop and described microwave source; Described field coil is wrapped on described microwave cavity outer wall; It is inner that described photocell is arranged on described microwave cavity; It is outside that described magnetic cup unit is placed in described microwave cavity, is used for the interference of armoured magnetic field signal; Described constant temperature unit is placed between described microwave cavity and described magnetic cup unit, is used for stablizing operating ambient temperature in described microwave cavity.
Further, described integrated filtering resonance unit comprises: the first integrated filtering resonance absorption bubble, the second integrated filtering resonance absorption bubble, metallic plate; Described the first integrated filtering resonance absorption bubble, described the second integrated filtering resonance absorption bubble are placed in described microwave cavity successively; Described metallic plate is arranged between described the first integrated filtering resonance absorption bubble, described the second integrated filtering resonance absorption bubble.
Further, described the first integrated filtering resonance absorption bubble, described the second integrated filtering resonance absorption bubble are the blister cavity body structure, and both shape, structure, size are identical.
Further, described the first integrated filtering resonance absorption bubble, described the second inner A element, the isotope B element of described A element, inert gas C that absorbs at the magnetic fields low-resonance for atom that all be filled with of integrated filtering resonance absorption bubble.
Further, described magnetic cup unit is metal cap.
What the utility model provided is a kind of based on two microwave detection system frequency markings, comprising: central processing unit, the first closed loop locking module, the second closed loop locking module, voltage-controlled enable module reach the physical control unit that is used for providing the atomic resonance Absorption Line.Wherein, the first closed loop locking module is connected with physical control unit, central processing unit successively; The second closed loop locking module is connected with physical control unit, central processing unit successively, is connected with extraneous user side simultaneously; Voltage-controlled enable module one end is connected with described central processing unit, and the other end is connected with described the second closed loop locking module.The utility model is by arranging the identical integrated filtering resonance absorption bubble of performance in the physical control unit, builds the closed loop that two groups of microwave excitation structures realize whole atomic frequency standard system and lock.And by voltage-controlled enable module is set, the second VCXO is controlled, realize frequently overcoming the saltus step impact that the external environment variation produces the complete machine output signal frequency in technology at the atom mark.
Description of drawings
Fig. 1 for the utility model embodiment provide based on two microwave detection system frequency marking overall structure schematic diagrames.
Fig. 2 for the utility model embodiment provide based on physical control unit theory structure schematic diagram in two microwave detection system frequency markings.
Wherein, 1-optical pumping spectrum lamp, 2-photocell, the 3-coupling loop, 4-microwave cavity, 5-field coil, the 6-metallic plate, the 7-constant temperature unit, 8-magnetic cup unit, 101-the first integrated filtering resonance absorption bubble, 102-the second integrated filtering resonance absorption bubble, the 103-microwave source, 201-user side, 202-central processing unit, 203-the first VCXO, 204-the second VCXO, the voltage-controlled enable module of 205-, 206-first is servo, 207-the first microwave radio circuit, 208-the second microwave radio circuit, 209-second is servo, 210-physical control unit.
Embodiment
Below in conjunction with accompanying drawing, the embodiment that the utility model is provided is described in further detail.
Referring to Fig. 1-2, what the utility model embodiment provided is a kind of based on two microwave detection system frequency markings, comprising: central processing unit 202, the first closed loop locking module, the second closed loop locking module, voltage-controlled enable module 205 and being used for provides the physical control unit 210 of atomic resonance Absorption Line.Wherein, the first closed loop locking module is connected with physical control unit 210, central processing unit 202 successively.The second closed loop locking module also is connected with physical control unit 210, central processing unit 202 successively.Simultaneously, the second closed loop locking module also is connected with extraneous user side 201.Voltage-controlled enable module 205 1 ends are connected with central processing unit 202, and the other end is connected with the second closed loop locking module.
In the present embodiment, the first closed loop locking module comprises: first servo the 206, first VCXO 203, the first microwave radio circuit 207.Wherein, first servo 206 is connected with central processing unit 202, the first microwave radio circuit 207, the first VCXO 203, physical control unit 210 successively.The first microwave radio circuit 207 is connected with physical control unit 210, the first VCXO 203 successively.The first VCXO 203 is connected with central processing unit 202.
In the present embodiment, the second closed loop locking module comprises: second servo the 209, second VCXO 204, the second microwave radio circuit 208.Wherein, second servo 209 is connected with central processing unit 202, the second microwave radio circuit 208, physical control unit 210 successively.The second microwave radio circuit 208 is connected with physical control unit 210, the second VCXO 204 successively.The second VCXO 204 is connected with central processing unit 202 by voltage-controlled enable module 205, also is connected with extraneous user side 201 simultaneously.
In the present embodiment, the physical control unit comprises: optical pumping spectrum lamp 1, resonant probe unit, microwave source 103.Wherein, optical pumping spectrum lamp 1 is the rubidium lamp of electrodless discharge, and by the radio frequency source excitation luminescence.Also be filled with in its bulb for the low inertia starter gas M of excitation potential.Preferably, gas M is Krypton or argon gas.Simultaneously, the resonant probe unit is connected with microwave source 103.
In the present embodiment, the resonant probe unit comprises: microwave cavity 4, field coil 5, at least one coupling loop 3, integrated filtering resonance unit, at least one photocell 2, constant temperature unit 7, magnetic cup unit 8.Wherein, integrated filtering resonance unit is placed in microwave cavity 4 inside.Simultaneously, integrated filtering resonance unit carries out the signal transmission by coupling loop 3 and microwave source 103.Preferably, the number of coupling loop 3 is 2, and the number of microwave source 103 is also 2, and each coupling loop 3 is corresponding one by one with each microwave source 103 annexation.Field coil 5 is wrapped on microwave cavity 4 outer walls.Photocell 2 is arranged on microwave cavity 4 inside.Magnetic cup unit 8 is placed in microwave cavity 4 outsides, is used for the interference of armoured magnetic field signal.Preferably, magnetic cup unit 7 is the metal caps that are made of special substance.Constant temperature unit 7 is placed between microwave cavity 4 and magnetic cup unit 8, is used for stability microwave chamber 4 interior operating ambient temperatures.
Preferably, photocell 2 is chosen in the silicon photocell that there is better sensitivity at the 800nm place, as the detector of integrated filtering resonance unit transmitted light.
In the present embodiment, integrated filtering resonance unit comprises: first integrated filtering resonance absorption bubble the 101, second integrated filtering resonance absorption bubble 102, metallic plate 6.Wherein, first integrated filtering resonance absorption bubble the 101, second integrated filtering resonance absorption bubble 102 is placed in microwave cavity 4 successively.Metallic plate 6 is arranged between first integrated filtering resonance absorption bubble the 101, second integrated filtering resonance absorption bubble 102, is used for avoiding the impact of first integrated filtering resonance absorption bubble 101, second integrated filtering resonance absorption bubble 102 left and right, two microwave field radiation phases mutual interference.First integrated filtering resonance absorption bubble the 101, second integrated filtering resonance absorption bubble 102 is the blister cavity body structure, and both shape, structure, size are identical.Simultaneously, all be filled with A element, the isotope B element of A element, the inert gas C that absorbs at the magnetic fields low-resonance for atom in both.And in the first integrated filtering resonance absorption bubble 101 A constituent content, B constituent content, gas C content respectively with the second integrated filtering resonance absorption bubble 102 in A constituent content, B constituent content, gas C content corresponding identical.Preferably, the A element is
87Rb, the B element is
85Rb, gas C is argon gas.
In the present embodiment, the Main Function of field coil 5 is to produce a weak magnetostatic field that parallels with the microwave magnetic field direction, make atomic ground state hyperfine structure generation Zeeman splitting, and provide the quantization axle for atomic transition, simultaneously by regulating the size of field coil 5 electric currents, change the intensity in magnetic field, the output frequency of micro-tensioning system.
In the present embodiment, the Main Function of microwave cavity 4 is that the microwave resonance for atom provides suitable microwave field, by coupling loop 3, the microwave signal that external microwave source 103 provides is introduced in cavity.Controlled by constant temperature unit 7, the operational environment of temperature constant is provided for integrated filtering resonance unit.
The present embodiment is mainly used in the atomic frequency standard field, wherein, physical control unit 210 is core cells of atomic frequency standard, physical control unit 210 provides a frequency stabilization, the narrower atomic resonance Absorption Line of live width, and atomic frequency standard is locked in by the output frequency with VCXO just and obtains high frequency stabilization rate output on the atomic resonance absworption peak.
Simultaneously, in inactive type rubidium atom frequency scale, electronic circuit (shown in Figure 1) Main Function is to produce to come from the microwave interrogation signals of quartz oscillator, and the output frequency of local oscillator is locked on the hyperfine 0-0 jump frequency of ground state of rubidium atom.And VCXO is the initialize signal source of excitation microwave field, and provide standard frequency to export, its frequency of oscillation is subjected to servo correction voltage control, and for atomic frequency standard, its phase noise has determined the characteristic of making an uproar mutually of the output signal beyond the servo loop bandwidth.
In atomic frequency standard
87Rb atomic transition frequency is 6834.687 * * * * MHz, in order to realize that resonance is inquired after and synchronous the detection, must be by the microwave interrogation signals being transferred on atomic resonance jump frequency centre frequency, simultaneously by comprehensively adding a little modulation of low frequency to microwave signal.
Servo (206,209) change the quantum frequency discrimination signal of physical control unit 210 outputs into direct current correction voltage, control the output frequency of corresponding VCXO (203,204), and then complete the locking of corresponding loop.
The present embodiment provide based on two microwave detection system frequency markings, identical first integrated filtering resonance absorption bubble the 101, the second integrated filtering resonance absorption bubble 102 of performance is set in physical control unit 210, and build two groups of microwave excitation structures, realize the closed loop locking of whole atomic frequency standard system in conjunction with peripheral two groups of circuit.This is equivalent to provide two duplicate atomic frequency standards in an individual system, so change when external environment, such as the variation of temperature, these two systems such as electromagnetic interference all should obtain the same reflection.The present embodiment utilizes this point just, and voltage-controlled enable module 205 is set in accompanying drawing 1 electronic line structure, and it is as follows based on two microwave detection system frequency marking operation principles that the present embodiment provides:
Controlled under the prerequisite of normal operation by central processing unit 202 in voltage-controlled enable module 205, the second VCXO 204, the second microwave radio circuit 208, second servo 209 are completed the closed loop locking process of complete machine with the physical control unit according to traditional atomic clock technology.In like manner, the first VCXO 203, the first microwave radio circuit 207, first servo 206 are also completed the closed loop locking process of complete machine with physical control unit 210 according to traditional atomic clock technology.What these two closed loop locking processes were different is, in the first closed loop locking module, the first VCXO 203 is rectified a deviation by the voltage of the first servo 206 outputs directly, and the second VCXO 204 in the second closed loop locking module need to be through central processing unit 204 the first servo voltages of 206, second servo 209 relatively, are rectified a deviation in voltage-controlled enable module 205 rears.What be equivalent to the first closed loop locking module operation is the real-time closed-loop locking process, and the second closed loop locking module operation is non real-time.
What the utility model embodiment provided is a kind of based on two microwave detection system frequency markings, and its advantage is:
S1: if due to the external environment impact, cause the unit 210 centre frequency generation saltus steps of above-mentioned atomic frequency standard physical control, at this moment saltus step is delivered to central processing unit 202 by the first servo 206, second servo 209 correction voltage that produces, first servo 206 also directly transfer to the first VCXO 203 simultaneously, complete the closed loop locking process in the first closed loop locking module.central processing unit 202 judges that first servo 206 draws inclined to one side degree whether consistent with corresponding VCXO that the second servo 209 correction voltage that produces causes, if consistent, 1E-10 magnitude for example, can judge that namely physical control unit 210 is by ectocine at this moment, be 1E-11 magnitude atomic frequency standard for stability so, obviously such assistant general that draws can cause atomic frequency standard system output signal frequency generation saltus step, central processing unit 202 will stop voltage-controlled enable module 205 work this moment, allow the second VCXO 204 export the frequency of self, to keep this complete machine frequency stability constantly.Thereby overcome the external environmental interference impact to the saltus step impact of complete machine output signal frequency.
S2: in view of the S1 operation principle, if whole atomic frequency standard is selected the high VCXO of short-term stability, draw deviator by the servo voltage that arranges in central processing unit 202 so, to make system when occurring short steady disadvantageous saltus step (saltus step that for example produces due to electronic circuit problem own), VCXO is not rectified a deviation, continue to use high steady VCXO index, the shown numerical stability of user side 201 that be connected with the second VCXO 204 this moment.And the long-term frequency drift that causes due to factors such as external environments is continued to use the S1 operation principle by physical control unit 210 correction of the first VCXO 203, the second VCXO 204 is revised.So just can realize the surely double excellent target of length in atomic frequency standard complete machine system.
It should be noted last that, above embodiment is only unrestricted in order to the technical solution of the utility model to be described, although with reference to example, the utility model is had been described in detail, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement the technical solution of the utility model, and not breaking away from the spirit and scope of technical solutions of the utility model, it all should be encompassed in the middle of claim scope of the present utility model.
Claims (10)
1. one kind based on two microwave detection system frequency markings, it is characterized in that, comprising: central processing unit (202), the first closed loop locking module, the second closed loop locking module, voltage-controlled enable module (205) reach the physical control unit (210) that is used for providing the atomic resonance Absorption Line;
Described the first closed loop locking module is connected with described physical control unit (210), described central processing unit (202) successively;
Described the second closed loop locking module is connected with described physical control unit (210), described central processing unit (202) successively, is connected with extraneous user side (201) simultaneously;
Described voltage-controlled enable module (205) one ends are connected with described central processing unit (202), and the other end is connected with described the second closed loop locking module.
2. according to claim 1 based on two microwave detection system frequency markings, it is characterized in that, described the first closed loop locking module comprises: first servo (206), the first VCXO (203), the first microwave radio circuit (207);
Described first servo (206) are connected with described central processing unit (202), described the first microwave radio circuit (207), described the first VCXO (203), described physical control unit (210) successively;
Described the first microwave radio circuit (207) is connected with described physical control unit (210), described the first VCXO (203) successively;
Described the first VCXO (203) is connected with described central processing unit (202).
3. according to claim 2 based on two microwave detection system frequency markings, it is characterized in that, described the second closed loop locking module comprises: second servo (209), the second VCXO (204), the second microwave radio circuit (208);
Described second servo (209) are connected with described central processing unit (202), described the second microwave radio circuit (208), described physical control unit (210) successively;
Described the second microwave radio circuit (208) is connected with described physical control unit (210), described the second VCXO (204) successively;
Described the second VCXO (204) is connected with described central processing unit (202) by described voltage-controlled enable module (205), is connected with extraneous user side (201) simultaneously.
4. according to claim 1-3 any one are described is characterized in that based on two microwave detection system frequency markings, and described physical control unit comprises: optical pumping spectrum lamp (1), resonant probe unit, microwave source (103);
Described optical pumping spectrum lamp (1) is by the radio frequency source excitation luminescence;
Described resonant probe unit is connected with described microwave source (103).
5. according to claim 4 based on two microwave detection system frequency markings, it is characterized in that:
Described optical pumping spectrum lamp (1) is the rubidium lamp of electrodless discharge, also is filled with gas M in its bulb.
6. according to claim 5 based on two microwave detection system frequency markings, it is characterized in that, described resonant probe unit comprises: microwave cavity (4), field coil (5), coupling loop (2), integrated filtering resonance unit, at least one photocell (3), constant temperature unit (7), magnetic cup unit (8);
Described integrated filtering resonance unit is placed in described microwave cavity (4) inside;
Described integrated filtering resonance unit carries out the signal transmission by described coupling loop (2) and described microwave source (4);
Described field coil (5) is wrapped on described microwave cavity (4) outer wall;
Described photocell (3) is arranged on described microwave cavity (4) inside;
Described magnetic cup unit (8) is placed in described microwave cavity (4) outside, is used for the interference of armoured magnetic field signal;
Described constant temperature unit (7) is placed between described microwave cavity (4) and described magnetic cup unit (8), is used for stablizing the interior operating ambient temperature of described microwave cavity (4).
7. according to claim 6 based on two microwave detection system frequency markings, it is characterized in that, described integrated filtering resonance unit comprises: the first integrated filtering resonance absorption bubble (101), the second integrated filtering resonance absorption bubble (102), metallic plate (6);
Described the first integrated filtering resonance absorption bubble (101), described the second integrated filtering resonance absorption bubble (102) are placed in described microwave cavity (4) successively;
Described metallic plate (6) is arranged between described the first integrated filtering resonance absorption bubble (101), described the second integrated filtering resonance absorption bubble (102).
8. according to claim 7 based on two microwave detection system frequency markings, it is characterized in that:
Described the first integrated filtering resonance absorption bubble (101), described the second integrated filtering resonance absorption bubble (102) are the blister cavity body structure, and both shape, structure, size are identical.
9. according to claim 8 based on two microwave detection system frequency markings, it is characterized in that:
Described the first integrated filtering resonance absorption bubble (101), inner A element, the isotope B element of described A element, the inert gas C that absorbs at the magnetic fields low-resonance for atom that all be filled with of described the second integrated filtering resonance absorption bubble (102).
10. according to claim 9 based on two microwave detection system frequency markings, it is characterized in that: described magnetic cup unit is metal cap.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220701219 CN202998067U (en) | 2012-12-17 | 2012-12-17 | Frequency standard based on two microwave detection systems |
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| CN 201220701219 CN202998067U (en) | 2012-12-17 | 2012-12-17 | Frequency standard based on two microwave detection systems |
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| CN 201220701219 Expired - Fee Related CN202998067U (en) | 2012-12-17 | 2012-12-17 | Frequency standard based on two microwave detection systems |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103067004A (en) * | 2012-12-17 | 2013-04-24 | 江汉大学 | Double-bulb type atomic clock |
| 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 |
| RU2541051C1 (en) * | 2013-09-30 | 2015-02-10 | федеральное государственное автономное образовательное учреждение высшего образования "Санкт-Петербургский государственный политехнический университет" (ФГАОУ ВО "СПбПУ") | Method for reference resonance formation at hyperfine transitions from normal state of alkali-metal atom |
-
2012
- 2012-12-17 CN CN 201220701219 patent/CN202998067U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103067004A (en) * | 2012-12-17 | 2013-04-24 | 江汉大学 | Double-bulb type atomic clock |
| CN103067004B (en) * | 2012-12-17 | 2016-03-30 | 江汉大学 | Two bubble atomic clock |
| 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 |
| RU2541051C1 (en) * | 2013-09-30 | 2015-02-10 | федеральное государственное автономное образовательное учреждение высшего образования "Санкт-Петербургский государственный политехнический университет" (ФГАОУ ВО "СПбПУ") | Method for reference resonance formation at hyperfine transitions from normal state of alkali-metal atom |
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