CN116979963A - A thickening integrated form bubble body structure for reducing rubidium atomic frequency standard atmospheric pressure influence - Google Patents
A thickening integrated form bubble body structure for reducing rubidium atomic frequency standard atmospheric pressure influence Download PDFInfo
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- CN116979963A CN116979963A CN202311235485.8A CN202311235485A CN116979963A CN 116979963 A CN116979963 A CN 116979963A CN 202311235485 A CN202311235485 A CN 202311235485A CN 116979963 A CN116979963 A CN 116979963A
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- face
- foam
- bubble
- wall
- frequency standard
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- 229910052701 rubidium Inorganic materials 0.000 title claims abstract description 37
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 230000008719 thickening Effects 0.000 title claims abstract description 11
- 238000005192 partition Methods 0.000 claims abstract description 16
- 238000004026 adhesive bonding Methods 0.000 claims abstract description 6
- 239000006260 foam Substances 0.000 claims abstract 24
- 238000010521 absorption reaction Methods 0.000 claims description 9
- 238000000926 separation method Methods 0.000 claims description 2
- 238000001914 filtration Methods 0.000 abstract description 12
- 230000010354 integration Effects 0.000 abstract description 5
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 11
- 230000008859 change Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000001228 spectrum Methods 0.000 description 5
- 230000006866 deterioration Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000007792 addition Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005283 ground state Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 230000005418 spin wave Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/26—Automatic control of frequency or phase; Synchronisation using energy levels of molecules, atoms, or subatomic particles as a frequency reference
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
The invention discloses a thickening integrated foam structure for reducing the influence of rubidium atomic frequency standard air pressure, which comprises a foam body, wherein the foam body comprises a cylindrical foam wall, a foam front end face and a foam rear end face which are arranged at two ends of the foam wall, and the foam body is divided into a filtering foam and an absorbing foam by a partition face from the foam front end face to the foam rear end face. The front end face of the bubble is a convergent lens with a spherical or aspherical outer surface. The partition surface and the foam wall are integrally formed or connected by gluing or bonding. The front end face and the rear end face of the bubble are respectively integrally formed with the bubble wall or connected by gluing or bonding. The invention can reduce sensitivity, simplify integration and have firm rigid structure.
Description
Technical Field
The invention relates to the field of atomic frequency standards, in particular to a thickening integrated bubble structure for reducing the influence of air pressure of a rubidium atomic frequency standard, which is suitable for the rubidium atomic frequency standard (rubidium atomic clock).
Background
The rubidium atomic frequency standard is source end equipment for generating time and frequency references, and comprises a physical system serving as a quantum frequency discriminator and a circuit system for locking and outputting a follow atomic signal. The physical system is a key component of atomic clock, mainly composed of spectrum lamp and cavity bubble system, in which the working substance 87 Rb is in the absorption bulb of the luminal system, isotope 85 The Rb is in the form of a light filter bubble, 87 the spectrum of the Rb spectrum lamp is obtained by filtering spectral lines through a filtering bubble hyperfine energy level 87 The Rb atomic ground state (0, 0) transition frequency is used as a frequency reference of the Rb atomic frequency standard, and we call the frequency the center frequency.
In high-precision metering work, the performance of the system can be influenced by various environmental factors including temperature, air pressure, magnetic field, humidity, mechanical vibration effect and the like, and the change of the temperature, the air pressure, the magnetic field, the humidity, the mechanical vibration effect and the like can deteriorate the core index of the rubidium atomic frequency standard, namely the frequency stability. In the rubidium atomic frequency standard system, buffer gas is filled in a spectrum lamp, a filter bubble and an absorption bubble. The addition of buffer gas has the benefits of increasing the atomic transition signal, such as narrowing resonance linewidth, fluorescence quenching, etc., but at the same time, the center frequency of the rubidium atomic transition is slightly shifted. Absorbing molecules or atoms of buffer gas in bubbles 87 The Rb atoms continuously collide 87 The electron spin wave function of Rb atoms produces a disturbance, thereby causing 87 The ultra-fine energy level of Rb atoms is shifted, i.e. causing a collision frequency shift. Because this frequency shift is primarily related to molecular thermal motion, the frequency shift can be estimated using temperature, air pressure, and a series of frequency shift coefficients:wherein->、/>、/>Is a constant. P (P) 0 Is T 0 Buffer gas pressure at temperature, according to this expression, the external gas pressure, temperature variation causes deformation of the bubble structure, thereby affecting the buffer gas pressure in the gas chamber. The variation in the buffer gas pressure causes a shift in the resonance energy level, which seriously affects the stability of the center frequency of the bubble-type rubidium atomic clock, resulting in deterioration of the long-term performance of the rubidium atomic clock. Therefore, how to keep the atomic frequency standard system working in a stable environment, and reduce the influence of physical factors such as the temperature, the air pressure and the like of the external environment on the frequency change is an important ring for further improving the working performance of the rubidium atomic frequency standard. The cavity bubble structure for reducing the influence of the air pressure on the rubidium atomic frequency standard can effectively reduce the deterioration condition of the air pressure effect on the rubidium atomic frequency standard. The sensitivity of the rubidium atomic frequency standard, especially the rubidium atomic frequency standard working in the ground atmospheric environment, to the atmospheric environment change is reduced, so that the rubidium atomic frequency standard can exert the due performance in a more severe environment.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a thickened integrated bubble structure for reducing the influence of the air pressure of a rubidium atomic frequency standard, which reduces the bubble shape change caused by the external air pressure change by increasing the structural support and obviously improves the medium-long term stability level of the rubidium atomic frequency standard in the atmospheric environment.
The above object of the present invention is achieved by the following technical means:
a thickening integrated form bubble body structure for reducing rubidium atomic frequency standard atmospheric pressure influence, including the bubble body, the bubble body includes the bubble wall of tube-shape and sets up terminal surface and rear end face before the bubble at bubble wall both ends, from the preceding terminal surface of bubble to the rear end face direction, separates into filtering bubble and absorption bubble by the partition surface in the bubble body.
As described above, the front end surface of the bubble is a converging lens with a spherical or aspherical outer surface.
The partition and the cell wall are integrally formed or glued or bonded as described above.
The front end face and the rear end face of the bubble are respectively integrally formed with the bubble wall or connected by gluing or bonding.
The thickness of the bulb wall is 1.5mm or more as described above.
As described above, the thicknesses of the front end face and the rear end face of the bubble are 2mm or more.
Compared with the prior art, the invention has the following advantages:
1. decreasing sensitivity. When the rubidium atomic clock system with the day stability of E-15 magnitude is not reached, the performance is limited to the precision or other influences of the rubidium atomic clock system, and the performance deterioration duty ratio caused by air pressure is limited when the rubidium atomic clock system works on the ground, so that the requirement on air pressure sensitivity is limited. For a rubidium atomic clock with the day stability reaching E-15 magnitude, when the rubidium atomic clock works in vacuum, the rubidium bubbles are not affected by air pressure fluctuation; in operation in a ground environment, the air pressure fluctuations during the day reach several hundred Pa, which can cause significant deterioration in the stability of the frequency output. The thickening treatment and other integrated operations are carried out on the rubidium bubble wall, so that the supporting performance of the bubble body structure is improved, compared with the traditional rubidium bubble structure, two end faces affected by air pressure are reduced, the interference of the air environment can be effectively restrained, and the long-term stability index level can be improved;
2. integration is simplified. Integration reduces the volume of the physical system. The filter bubble and the absorption bubble are integrated, so that the cavity bubble structure is simplified, the lens can be further integrated, the assembly structural part is reduced, the space utilization rate is high, and the miniaturization design is facilitated;
3. has a firm rigid structure. Compared with the separation component, the integrated optical system has stronger vibration resistance, impact resistance and acceleration resistance, avoids affecting the stability of the optical system due to mechanical factors, and has good mechanical environment adaptability.
Drawings
Fig. 1 is a schematic perspective view of a first embodiment of the present invention;
FIG. 2 is a schematic side view of a first embodiment of the present invention;
FIG. 3 is a schematic perspective view of a second embodiment of the present invention;
FIG. 4 is a schematic side view of a second embodiment of the present invention;
fig. 5 is a schematic diagram showing a conventional rubidium bubble in three-dimensional structure;
fig. 6 is a schematic side view of a conventional rubidium bulb.
In the figure: 1-filtering bubbles; 2-absorbing bubbles; 3-soaking the front end face; 4-a rear end face; 5-soaking walls; 6-isolating sections; 7-end face.
Detailed Description
The present invention will be further described in detail below in conjunction with the following examples, for the purpose of facilitating understanding and practicing the present invention by those of ordinary skill in the art, it being understood that the examples described herein are for the purpose of illustration and explanation only and are not intended to limit the invention.
A thickening integrated form bubble body structure for reducing rubidium atomic frequency standard atmospheric pressure influence, includes the bubble body, and the bubble body includes tube-shape bubble wall 5 and sets up terminal surface 3 and rear end face 4 before the bubble at tube-shape bubble wall 5 both ends, from terminal surface 3 to rear end face 4 direction before the bubble, separates into filtering bubble 1 and absorption bubble 2 by partition surface 6 in the bubble body.
The invention integrates the discrete filtering bubble 1 and the absorbing bubble 2 into a whole, the front end surface 3, the rear end surface 4 and the bubble wall 5 of the bubble are thickened, the outer surface of the front end surface 3 of the bubble can be a spherical surface or an aspheric surface as shown in figures 1-4, the front end surface 3 of the bubble is a converging lens, the function of optimizing light spots is achieved, the partition surface 6 is a partition surface between the filtering bubble 1 and the absorbing bubble 2, the partition surface 6 can achieve the function of improving the supportability of the filtering bubble 1 and the absorbing bubble 2 for the integrated bubble structure, and the position of the partition surface 6 can be adjusted according to design requirements, so that the sizes of the absorbing bubble 1 and the filtering bubble 2 are distributed.
In this example, from the front end face 3 to the rear end face 4 of the bubble, the interior of the bubble is divided into a front air chamber and a rear air chamber by a partition face 6, the front air chamber is a sealed hollow structure formed by a bubble wall 5, the front end face 3 of the bubble and the partition face 6, and the rear air chamber is a sealed hollow structure formed by the bubble wall 5, the rear end face 4 and the partition face 6. The front air chamber is filled with 85 Rb saturationSteam and buffer gas are used as the filtering bubble 1, and the rear air chamber is filled with 87 Rb saturated steam and buffer gas are used as absorption bubbles, and the buffer gas is inert gas such as nitrogen.
The bubble wall 5, the bubble front end surface 3, the back end surface 4 and the partition surface 6 are all made of alkali-resistant glass and kept sealed, so that the alkali-resistant glass has good corrosion resistance and light transmittance, the consumption of alkali metal steam is avoided, and the loss of light intensity in the transmission and forward and backward scattering processes is reduced as much as possible when the light of the spectrum lamp passes through the end surface.
The filter bubble 1 and the absorption bubble 2 are integrated into a whole, so that the space of a physical system is saved, and the integration and miniaturization are facilitated.
The bubble wall 5 is of a cylindrical structure, is thickened, has a thickness of 1.5mm, and is enhanced by 50% compared with the traditional bubble structure. The design requirements of indexes under the general weather condition can be met, and the special indexes can be additionally thickened.
The front end face 3 and the rear end face 4 of the bubble are the areas with the largest deformation caused by the atmospheric fluctuation, special thickening is needed, the special thickening is designed to be 2mm in general, the influence of the atmospheric fluctuation on the frequency can be reduced by one order of magnitude, if the influence of the atmospheric fluctuation is further reduced, the end faces can be further thickened, the front end face 3 of the bubble can be integrated with a converging lens (spherical and aspherical converging lenses), and the front end face 3 of the bubble is integrally manufactured and formed by using a gluing process, a bonding process or directly and integrally using alkali-resistant glass during integration, as shown in fig. 1-4; therefore, the effect of thickening the end face is achieved, the incident light spots can be shaped, and the receiving efficiency of the photocell is improved. Typically, where a converging lens is integrated with the bubble front face 3, the converging light spot may meet the requirements of rubidium Zhong Guangjian. If a better effect is to be achieved, the rear end face 4 can also be integrated with a converging lens, so that the light spot intensity is enhanced.
The partition surface 6 is added between the filtering bubble 1 and the absorbing bubble 2, so that the supportability of the structure is enhanced, and compared with a traditional structure, the end surfaces affected by air pressure are reduced by 2, and the influence of external air pressure fluctuation on the air pressure in the air chamber can be reduced.
The function of the isolating section 6 is to ensure that a stable temperature difference can be formed between the filter bubble 1 and the absorption bubble 2, the whole bubble structure is enhanced, and the thickness is required to reach 3mm.
The method is simple and easy to implement, can greatly enhance the environmental adaptability of the rubidium atomic frequency standard while greatly enhancing the long-term stability performance of the rubidium atomic frequency standard, is compatible with a plurality of use scenes of ground and satellite vehicles, and is beneficial to enhancing the competitiveness of the product, developing the universal product and reducing the production cost.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (2)
1. A thickening integrated foam structure for reducing the influence of rubidium atom frequency standard air pressure comprises a foam body and is characterized in that the foam body comprises a cylindrical foam wall (5), a foam front end face (3) and a foam rear end face (4) which are arranged at two ends of the foam wall (5), a filter foam (1) and an absorption foam (2) are separated from each other by a separation face (6) from the foam front end face (3) to the foam rear end face (4),
the front end face (3) of the bubble is a convergent lens with a spherical or aspheric outer surface,
the partition surface (6) and the bubble wall (5) are integrally formed or connected in a gluing or bonding way,
the front end face (3) and the rear end face (4) of the bubble are respectively integrally formed with the bubble wall (5) or connected by gluing or bonding.
2. A thickened integrated bulb structure for reducing the influence of the air pressure of rubidium atomic frequency standard according to claim 1, characterized in that the thickness of the bulb wall (5) is equal to 1.5mm, the thickness of the front end face (3) and the rear end face (4) of the bulb is equal to 2mm, and the thickness of the partition face (6) is equal to 3mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311235485.8A CN116979963A (en) | 2023-09-25 | 2023-09-25 | A thickening integrated form bubble body structure for reducing rubidium atomic frequency standard atmospheric pressure influence |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311235485.8A CN116979963A (en) | 2023-09-25 | 2023-09-25 | A thickening integrated form bubble body structure for reducing rubidium atomic frequency standard atmospheric pressure influence |
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| Publication Number | Publication Date |
|---|---|
| CN116979963A true CN116979963A (en) | 2023-10-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311235485.8A Pending CN116979963A (en) | 2023-09-25 | 2023-09-25 | A thickening integrated form bubble body structure for reducing rubidium atomic frequency standard atmospheric pressure influence |
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| CN (1) | CN116979963A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101000974A (en) * | 2006-01-10 | 2007-07-18 | 中国科学院武汉物理与数学研究所 | Rubidium atomic frequency standard microwave cavity resonator |
| CN101237077A (en) * | 2008-01-29 | 2008-08-06 | 四川天奥星华时频技术有限公司 | Small Rb atom frequency marking cavity bubble system |
| CN106129573A (en) * | 2016-08-19 | 2016-11-16 | 中国科学院武汉物理与数学研究所 | A kind of New type atom frequency marking microwave cavity |
| CN111245434A (en) * | 2020-01-21 | 2020-06-05 | 中国科学院武汉物理与数学研究所 | Cavity bubble system for high-precision rubidium atomic frequency standard |
-
2023
- 2023-09-25 CN CN202311235485.8A patent/CN116979963A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101000974A (en) * | 2006-01-10 | 2007-07-18 | 中国科学院武汉物理与数学研究所 | Rubidium atomic frequency standard microwave cavity resonator |
| CN101237077A (en) * | 2008-01-29 | 2008-08-06 | 四川天奥星华时频技术有限公司 | Small Rb atom frequency marking cavity bubble system |
| CN106129573A (en) * | 2016-08-19 | 2016-11-16 | 中国科学院武汉物理与数学研究所 | A kind of New type atom frequency marking microwave cavity |
| CN111245434A (en) * | 2020-01-21 | 2020-06-05 | 中国科学院武汉物理与数学研究所 | Cavity bubble system for high-precision rubidium atomic frequency standard |
Non-Patent Citations (1)
| Title |
|---|
| 周渭: "《时频测控技术》", 西安电子科技大学出版社, pages: 18 - 21 * |
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Application publication date: 20231031 |