CN103363359A - Spectral lamp for rubidium atomic frequency standard - Google Patents
Spectral lamp for rubidium atomic frequency standard Download PDFInfo
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- CN103363359A CN103363359A CN2013103161782A CN201310316178A CN103363359A CN 103363359 A CN103363359 A CN 103363359A CN 2013103161782 A CN2013103161782 A CN 2013103161782A CN 201310316178 A CN201310316178 A CN 201310316178A CN 103363359 A CN103363359 A CN 103363359A
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Abstract
The invention discloses a spectral lamp for a rubidium atomic frequency standard. A sapphire glass sheet is adhered into a glass sheet clamping opening in the top of a lamp base cover through silicone rubber. A coupling coil is closely wound on the upper part of a bulb. One end of the coupling coil is welded with a core wire of a coaxial wire, and the other end of the coupling coil is welded with the outer wall of the coaxial wire. The coaxial wire penetrates through the lamp base cover, a transition circuit board, a shielding box and a radio frequency circuit board, and is welded at the ground ends of the transition circuit board and the radio frequency circuit board. The lamp base cover is fixedly arranged on the transition circuit board through screws. Leading wires of a heating coil and a temperature sensing element are welded on the transition circuit board. The lamp base cover is fixedly arranged on the transition circuit board through the screws at the bottom of the lamp base cover. The transition circuit board is fixedly arranged on a lamp bracket through screws. The lamp bracket is fixedly arranged on the shielding box through screws. The radio frequency circuit board is fixedly arranged in the shielding box through screws. The spectral lamp is simple in structure, easy to machine, stable in performance and high in environmental adaptability, and can be directly applied to the rubidium atomic frequency standard.
Description
Technical field
The present invention relates to a kind of spectrum lamp field, more specifically relate to a kind of Rb atom frequency marking spectrum lamp, can be directly used in the Rb atom frequency marking that (such as spaceborne environment) uses under the various strict environment.
Technical background
The reasons such as Rb atom frequency marking is little, low in energy consumption with its volume, good stability are used widely, especially for fields such as satellite positioning navigations.It mainly is made of physical system and circuit two parts.The former provides a reference frequency as a frequency discriminator, and the latter is equivalent to a frequency locked loop and is locked on the reference frequency of physical system in order to the output frequency with VCXO.Physical system is broadly divided into spectrum lamp and cavity bubble system two parts.The light that the spectrum lamp sends will absorb the 87Rb atom that is in the hyperfine energy level F=1 of ground state in the bubble and be pumped into the F=2 energy level after filtering, cause population inversion.This moment is with adding the transition of microwave field excitation 87Rb atom from F=2 to the F=1 energy level.When transition occured, what photocell detected will die down through absorbing the bubble light intensity.This variation of transmitted light intensity namely is the light detecting signal of atomic transition.The luminous stability of spectrum lamp directly affects the stability of atomic transition signal, thereby affects the performance of frequency marking complete machine.
The existing comparatively ripe spectrum lamp design of tradition Rb atom frequency marking, but only for normal atmospheric environment work design can occur under spaceborne environment that vacuum is overheated, the low-pressure discharge lamp problem.The Rb atom frequency marking that uses for this condition is often also very high to the requirement of index, and has the diverse working environment of rubidium frequency standard that uses with ground.In order to satisfy spaceborne environmental suitability and the stability of spectrum lamp work and the requirement of reliability, invented the spectrum lamp of this kind new construction.This structure spectrum lamp is compared with prior art and had the following advantages and effect: Electro Magnetic Compatibility is good, and is simple for structure, is easy to processing and commercialization.Environmental suitability is strong, uses in the Rb atom frequency marking and all can adopt at atmosphere, spaceborne environment.
Summary of the invention
The objective of the invention is to be to provide a kind of Rb atom frequency marking spectrum lamp, simple for structure, be easy to processing, stable performance can directly apply in the Rb atom frequency marking, the Rb atom frequency marking spectrum lamp of good environmental adaptability, comprise the harmless transmission means of radiofrequency signal from the radio-frequency oscillator to the lamp holder, be easy to the Cap casing mode of grooving that bulb is lighted, is easy to improve coupling efficiency, guaranteed the design of bulb cold junction, and heat exchange method between bulb and the metalized lamp head-shield.
In order to realize above-mentioned purpose, the present invention adopts following technical measures:
A kind of Rb atom frequency marking spectrum lamp, it is made of sheet glass, Cap casing, heater strip, transition circuit plate, bulb, coupling coil, temperature-sensing element, lamp support, coaxial line, shielding box and radio frequency circuit board.It is characterized in that: the sapphire glass sheet is bonded in the Cap casing top glass sheet bayonet socket by silicon rubber (GD414), is the logical light window of spectrum lamp.Coupling coil is a close wire coil around bulb top, one end and the welding of coaxial line heart yearn, the other end and the welding of coaxial line outer wall.Coaxial line passes Cap casing, transition circuit plate, shielding box and radio frequency circuit board, and its outer wall and Cap casing keep good electrically contacting, and is welded on the ground end of transition circuit plate and radio frequency circuit board.Bulb is the inner glass envelope that is filled with an amount of metal rubidium and inert gas (Ar, Xe), is shaped as cylindricly, and the bottom is the bubble tail.Cap casing is the cylinder-like structure that metal material is made, and there is a deck inside, is used for laying the rubidium bulb.In deck and cup-like structure, be coated with full silicon rubber (GD414), realize firmly Mechanical Contact and closely thermo-contact between bulb and the Cap casing.Have the suitable groove of size at metalized lamp head-shield sidewall; Be used for twining heater coil.Heater coil adopts the coiling of Double-wire parallel wound method.The sidepiece of Cap casing has a slit.There is an aperture bottom surface of Cap casing, is used for laying temperature-sensing element, and temperature-sensing element is a thermistor MF51.The Cap casing bottom is a cup-like structure, is used for holding the bubble tail of rubidium bulb.Cap casing is fixed by screws on the transition circuit plate.The wire bonds of heater coil and temperature-sensing element is on the transition circuit plate, and by crossing temperature-adjusting circuit (not shown) of circuit board access.Cap casing is fixed on the transition circuit plate by the screw of its bottom, and the transition circuit plate is fixed by screws on the lamp support.Lamp support can be made of the Titanium alloy material of low heat conduction.Lamp support is fixed by screws on the shielding box.Radio frequency circuit board is fixed in the shielding box by screw.At radio frequency circuit board a high-frequency generator is housed.This high-frequency generator can be made with Klapp circuit or other suitable circuit theory, can produce frequency at tens high frequency electrical signals to megahertz more than 100.
Described pumping signal is directly transmitted into Cap casing by the Cap casing small hole at bottom part from radio frequency circuit board by coaxial line.
Describedly have the suitable slit of size at metalized lamp head-shield sidewall.
Described bayonet socket at the Cap casing top makes the Cap casing sealing with sapphire glass.
Described bulb bubble tail directly is connected with the metalized lamp head-shield by silicon-based adhesive, and this is so that the tail end of bulb is slightly low with respect to other position temperature of bulb.
The sidepiece of described Cap casing has a groove, is used for laying the heater coil of coiling.There is an aperture bottom surface of Cap casing, is used for laying temperature-sensing element, and temperature-sensing element is a MF51 model thermistor.The Cap casing bottom is a cup-like structure.
Be filled with an amount of metal rubidium and a certain amount of inert gas in the bulb.Pass into the direct heating lamp head-shield of heater strip of DC current, outside temperature-adjusting circuit and be embedded in that controlled heating loop that the temperature sensing device (thermistor MF51) on the Cap casing consists of is then very stable to be controlled at Cap casing the temperature spot that normal operation needs.Thereby Cap casing then makes metal rubidium wherein become the rubidium vapor atomic on the heat transferred bulb by heat transmission and the thermal-radiating mode of inwall.The radiofrequency signal that RF oscillatory circuit produces passes to close coupling coil around bulb by coaxial line.The radiofrequency signal that is coupled in the bulb by coupling coil ionizes the intert-gas atoms in the bulb, inert gas ion after the ionization passes to the rubidium atom with energy and makes the rubidium atom be in excitation state by collision, and the rubidium atom spontaneous transition that is in excitation state is to ground state and luminous.Thereby provide optical signal to rubidium frequency standard.
The stability of the light intensity that the spectrum lamp provides is mainly determined by the stability of radiofrequency signal and the temperature-controlled precision in temperature control loop.
The present invention compared with prior art has the following advantages and effect:
1 radiofrequency signal directly imports lamp holder by coaxial line by Cap casing bottom, the outer wall of coaxial line respectively with the ground wire welding of radio frequency circuit board and transition circuit plate.This structure can guarantee that radiofrequency signal reduces as much as possible extraneous interference to radiofrequency signal and causes the unstable of radiofrequency signal the process that imports lamp holder from radio circuit, thereby has influence on the strong stability of spectrum light.Simultaneously radiofrequency signal radiation to environment in transmission course has also obtained good inhibition under this structure, can eliminate on the one hand the radiofrequency signal that leaks and cause radio-frequency pollution to the rubidium frequency standard complete machine, has also improved on the other hand the efficiency of transmission of radiofrequency signal.
2 open a narrow elongated slot at the sidewall of Cap casing.The radiofrequency signal that this structure can well overcome in the coupling coil produces eddy current in the metalized lamp head-shield.Thereby the existence meeting of this eddy current reduces efficient that RF energy transmits in the bulb greatly allows bulb start and to need higher condition during work.Cap casing sidewall fluting can be clearly the condition of work of reduction spectrum lamp, and because the width of fluting (～0.5mm) be far smaller than operating frequency～100MHz radiofrequency signal wavelength (～3m), the seal to radiofrequency signal that can not guarantee Cap casing not and sacrifice because of the existence of this groove.
The top bayonet socket of 3 Cap casings adopts the sapphire glass sealing.Sapphire glass has good thermal conductivity, guarantees the reasonability of internal temperature field distribution thereby adopt it to be consistent in a short period of time in the temperature that guarantees to make under the unimpeded prerequisite of light path Cap casing top and side-wall metallic.
4 bulbs bubbles tail by silicon-based adhesive directly and the metalized lamp head-shield bond together.When heater strip heating lamp head-shield, the heat transferred bulb that Cap casing can produce heater strip easily.Thermal resistance between bulb and the Cap casing is little, and the efficiency of heating surface is high, is conducive to reduce the thermal losses and the thermostatic control that realizes spectrum lamp bulb of spectrum lamp.And, when vacuum environment is worked, little so also can well derive at the heat of bulb inner accumulation and to be unlikely to cause overheating effect owing to the thermal resistance between bulb and the Cap casing.With respect to the bubble body, thermal resistance is less between bubble tail and metalized lamp head-shield in addition, so that bubble tail temperature is lower.In order to guarantee to compose the lamp working life, the metal rubidium more than needed that is filled with in the bulb can well concentrate on the minimum bubble tail of temperature, and this can effectively eliminate metal rubidium more than needed thermophoresis in bubble and cause composing the unsettled harmful effect of lamp output intensity.
5 heater strips take the mode of Double-wire parallel wound can effectively avoid the radiofrequency signal in heater strip and the coupling coil to form mutual inductance.Thereby cut off interacting between radiofrequency signal and heating current.
Description of drawings
Fig. 1 is a kind of Rb atom frequency marking spectrum modulated structure schematic diagram.
Wherein: sheet glass 1(sapphire glass), Cap casing 2, heater strip 3, transition circuit plate 4(PCB sheet material F4B-2), rubidium bulb 5, coupling coil 6, temperature-sensing element 7(thermistor MF51), lamp support 8, coaxial line 9, shielding box 10, radio frequency circuit board 11(PCB sheet material F4B-2).
Fig. 2 is a kind of Cap casing schematic perspective view.
Wherein: sheet glass bayonet socket 2a, slit 2b, heater strip groove 2c, cup-like structure 2d
The specific embodiment
Embodiment 1:
According to Fig. 1, Fig. 2 as can be known, a kind of Rb atom frequency marking spectrum lamp, it is made of sapphire glass sheet 1, Cap casing 2, heater coil 3, transition circuit plate 4, rubidium bulb 5, coupling coil 6, temperature-sensing element 7, lamp support 8, coaxial line 9, shielding box 10 and radio frequency circuit board 11.It is characterized in that: sapphire glass sheet 1 is bonded in the Cap casing 2 top glass sheet bayonet socket 2a by silicon rubber, is the logical light window of spectrum lamp.Coupling coil 6 is close wire coils around bulb 5 tops, one end and the welding of coaxial line 9 heart yearns, the other end and the welding of coaxial line 9 outer walls.Coaxial line passes Cap casing 2, transition circuit plate 4, shielding box 10 and radio frequency circuit board 11, and its outer wall and Cap casing 2 keep good electrically contacting, and are welded on the ground end of rebound 4 and radio frequency circuit board 11.Bulb 6 is the inner glass envelope that is filled with an amount of metal rubidium and inert gas (Ar, Xe), is shaped as cylindricly, and the bottom is the bubble tail.The cylinder-like structure that Cap casing 2 is made for metal material, inside have a deck, are used for laying rubidium bulb 5.The bottom of Cap casing 2 is cup-like structure 2d, is coated with full silicon rubber (GD414) in deck and cup-like structure 2d, realizes firmly Mechanical Contact and closely thermo-contact between bulb 5 and the Cap casing 2.Have the suitable groove 2c of size at metalized lamp head-shield 2 sidewalls, be used for twining heater coil.Heater coil 3 can adopt the coiling of Double-wire parallel wound method.The sidepiece of Cap casing 2 has a slit 2b.There is an aperture bottom surface of Cap casing 2, is used for laying temperature-sensing element 7, and temperature-sensing element is a thermistor MF51.Cap casing 2 bottoms are cup-like structure 2d, are used for holding the bubble tail of rubidium bulb 5.The bottom surface of this cup-like structure has the hole of a suitable size.Cap casing 2 is fixed by screws on the transition circuit plate 4.The wire bonds of heater coil 3 and temperature-sensing element 7 is on transition circuit plate 4, and by crossing temperature-adjusting circuit (not shown) of circuit board 4 access.Cap casing 2 is fixed on the transition circuit plate 4 by the screw of its bottom, and transition circuit plate 4 is fixed by screws on the lamp support 8.Lamp support 8 can be made of the Titanium alloy material of low heat conduction.Lamp support 8 is fixed by screws on the shielding box 10.Radio frequency circuit board 11 is fixed in the shielding box 10 by screw.At radio frequency circuit board 11 high-frequency generator is housed.This high-frequency generator can be made with Klapp circuit or other suitable circuit theory, can produce frequency at tens high frequency electrical signals to megahertz more than 100.
Described coaxial line 9 through the hole of shielding box 10, transition circuit plate 4 and Cap casing 2 bottoms directly import inner its outer wall of Cap casing respectively with the ground welding of radio frequency circuit board 11 and transition circuit plate 5.
The bayonet socket at described Cap casing 2 tops makes its sealing with sapphire glass 1.
Described bulb 6 directly is connected with metalized lamp head-shield 2 by silicon-based adhesive.
Operation material of the present invention is the plasma that rubidium steam in the rubidium bulb 5 and inert gas consist of.The DC current that temperature-adjusting circuit provides is injected into heater coil 3, directly heating lamp head-shield 2.The controlled heating loop that temperature-adjusting circuit and temperature-sensing element 4 consist of stably is controlled at suitable temperature spot with Cap casing 2.Thereby Cap casing 2 makes metal rubidium wherein become the rubidium vapor atomic on heat transferred bulb 5 by heat conduction and the thermal-radiating mode of inwall.The radiofrequency signal that RF oscillatory circuit 11 produces passes to close coupling coil 6 around rubidium bulb 5 by coaxial line 9, the radiofrequency signal and the starter gas molecule in the bulb 5 that are coupled in the bulb 5 by coupling coil 6 interact, make the ionization of starter gas molecule, produce ion and electronics.Ion and electronics and starter gas molecule collision are energized into excitation state with a large amount of starter molecules.The starter gas molecule that is in excitation state passes to the rubidium vapor atomic by collision with energy, makes the rubidium vapor atomic transit to excitation state.The rubidium atom spontaneous transition that is in excitation state is to ground state and luminous.
Claims (6)
1. Rb atom frequency marking spectrum lamp, it comprises sapphire glass sheet (1), Cap casing (2), heater coil (3), transition circuit plate (4), coupling coil (6), temperature-sensing element (7), shielding box (10) and radio frequency circuit board (11), it is characterized in that: sapphire glass sheet (1) is bonded in Cap casing (2) the top glass sheet bayonet socket (2a) by silicon rubber, coupling coil (6) is close around rubidium bulb (5) top, the welding of one end and coaxial line (9) heart yearn, the welding of the other end and coaxial line (9) outer wall, coaxial line (9) passes Cap casing (2), transition circuit plate (4), shielding box (10) and radio frequency circuit board (11), and be welded on the ground end of rebound (4) and radio frequency circuit board (11), the cylinder-like structure that Cap casing (2) is made for metal material, there is a deck inside, in deck and cup-like structure (2d), be coated with full silicon rubber, heater coil (3) adopts the coiling of Double-wire parallel wound method, the sidepiece of Cap casing (2) has a slit (2b), Cap casing (2) is fixed by screws on the transition circuit plate (4), the wire bonds of heater coil (3) and temperature-sensing element (7) is on transition circuit plate (4), Cap casing (2) is fixed on the transition circuit plate (4) by the screw of its bottom, transition circuit plate (4) is fixed by screws on the lamp support (8), lamp support (8) is fixed by screws on the shielding box (10), and radio frequency circuit board (11) is fixed in the shielding box (10) by screw.
2. a kind of Rb atom frequency marking spectrum lamp according to claim 1 is characterized in that: described coaxial line (9) through the hole of shielding box (10), transition circuit plate (4) and Cap casing (2) bottom directly import inner its outer wall of Cap casing respectively with the ground welding of radio frequency circuit board (11) and transition circuit plate (5).
3. a kind of Rb atom frequency marking spectrum lamp according to claim 1 is characterized in that: describedly have slit (2b) at metalized lamp head-shield (2) sidewall.
4. a kind of Rb atom frequency marking spectrum lamp according to claim 1, it is characterized in that: the bayonet socket at described Cap casing (2) top makes its sealing with sapphire glass (1).
5. a kind of Rb atom frequency marking spectrum lamp according to claim 1 is characterized in that: described bulb (6) directly is connected with metalized lamp head-shield (2) by silicon-based adhesive.
6. a kind of Rb atom frequency marking spectrum lamp according to claim 1, it is characterized in that: the bottom of described Cap casing (2) is a cup-like structure (2d).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310316178.2A CN103363359B (en) | 2013-07-25 | 2013-07-25 | Spectral lamp for rubidium atomic frequency standard |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310316178.2A CN103363359B (en) | 2013-07-25 | 2013-07-25 | Spectral lamp for rubidium atomic frequency standard |
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| CN103363359B CN103363359B (en) | 2015-01-14 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103836421A (en) * | 2014-03-21 | 2014-06-04 | 成都天奥电子股份有限公司 | Rubidium atomic frequency standard spectrum lamp device suitable for vacuum conditions |
| CN105576479A (en) * | 2015-12-14 | 2016-05-11 | 北京无线电计量测试研究所 | Mercury spectroscopic lamp |
| CN110212918A (en) * | 2019-06-25 | 2019-09-06 | 中国科学院武汉物理与数学研究所 | A kind of outer layer temperature control and magnetic shielding device for Rb atom frequency marking |
| CN110260200A (en) * | 2019-06-06 | 2019-09-20 | 中国科学院武汉物理与数学研究所 | Open integrated small rubidium spectral lamp for small Rb atom frequency marking |
| CN116107186A (en) * | 2023-04-04 | 2023-05-12 | 成都量子时频科技有限公司 | Integrated closed ultrathin rubidium spectrum lamp device applied to miniaturized rubidium atomic clock |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103836421A (en) * | 2014-03-21 | 2014-06-04 | 成都天奥电子股份有限公司 | Rubidium atomic frequency standard spectrum lamp device suitable for vacuum conditions |
| CN103836421B (en) * | 2014-03-21 | 2016-01-13 | 成都天奥电子股份有限公司 | Be applicable to the rubidium atomic frequency standard spectral lamp device of vacuum condition |
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| CN110260200A (en) * | 2019-06-06 | 2019-09-20 | 中国科学院武汉物理与数学研究所 | Open integrated small rubidium spectral lamp for small Rb atom frequency marking |
| CN110212918A (en) * | 2019-06-25 | 2019-09-06 | 中国科学院武汉物理与数学研究所 | A kind of outer layer temperature control and magnetic shielding device for Rb atom frequency marking |
| CN116107186A (en) * | 2023-04-04 | 2023-05-12 | 成都量子时频科技有限公司 | Integrated closed ultrathin rubidium spectrum lamp device applied to miniaturized rubidium atomic clock |
| CN116107186B (en) * | 2023-04-04 | 2023-09-01 | 成都量子时频科技有限公司 | Integrated closed ultrathin rubidium spectrum lamp device applied to miniaturized rubidium atomic clock |
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