11 results about "Atomic frequency standard" patented technology

The present application relates to the field of atomic frequency standards and provides a method and device for stabilizing the static magnetic field of an atomic beam clock based on two atoms. By introducing a second atom on the basis of a traditional atomic beam clock, the two atoms work together in the same path and magnetic field. The first atom is responsible for generating clock transitions as the main frequency reference; while the second atom is specifically used for static magnetic field stabilization. By periodically scanning the Ramsey pattern of the second atom, the changes in the static magnetic field are detected and compensated accordingly to ensure that the static magnetic field remains constant. Since the two atoms are in the same static magnetic field environment, when the static magnetic field of the second atom is stable, the static magnetic field of the first atom also remains stable, effectively eliminating the magnetic field frequency shift. Throughout the process, the locking loop of the first atom is always in a closed state, avoiding the adverse effects on long-term stability caused by the open loop in the traditional method, and improving the long-term stability of the atomic beam clock.

The application relates to the technical field of signal processing, and provides a signal processing method and system of a rubidium atomic frequency standard, a main frequency standard adopts a double-threshold amplitude comparison circuit, a standby frequency standard adopts a single-threshold amplitude comparison circuit, and the existence of a signal, the validity of an amplitude and a locking state are synchronously monitored; double-threshold detection of the main frequency standard ensures reliability, single-threshold detection of the standby frequency standard ensures readiness for quick switching, and the reliability and switching efficiency are balanced; through preset logic rule fusion analysis, the validity is comprehensively judged in combination with a frequency standard locking signal. A control signal is generated based on a priority rule, the main frequency standard is kept when the main frequency standard is valid, a high-level pulse synchronized with a 10MHz signal zero-crossing point is generated when the main frequency standard is invalid and the standby is ready, an abnormal alarm is triggered when the double frequency standards fail, and the control signal is transmitted to a frequency standard switching circuit through a level conversion subunit, so that the trigger timing requirement of a high-speed switching module is met, quick response switching is ensured, the stability in the switching process is ensured, and the whole is reliable and stable.

The application relates to the technical field of signal processing, and provides a signal processing method and system of a rubidium atomic frequency standard, a main frequency standard adopts a double-threshold amplitude comparison circuit, a standby frequency standard adopts a single-threshold amplitude comparison circuit, and the existence of a signal, the validity of an amplitude and a locking state are synchronously monitored; double-threshold detection of the main frequency standard ensures reliability, single-threshold detection of the standby frequency standard ensures readiness for quick switching, and the reliability and switching efficiency are balanced; through preset logic rule fusion analysis, the validity is comprehensively judged in combination with a frequency standard locking signal. A control signal is generated based on a priority rule, the main frequency standard is kept when the main frequency standard is valid, a high-level pulse synchronized with a 10MHz signal zero-crossing point is generated when the main frequency standard is invalid and the standby is ready, an abnormal alarm is triggered when the double frequency standards fail, and the control signal is transmitted to a frequency standard switching circuit through a level conversion subunit, so that the trigger timing requirement of a high-speed switching module is met, quick response switching is ensured, the stability in the switching process is ensured, and the whole is reliable and stable.

The application discloses a CPT atomic clock applied to the field of atomic frequency standards. The CPT atomic clock comprises a VCSEL, a 1 / 4 lambda wave plate, a lens and an optical cavity, wherein the VCSEL is used for generating laser required for optical pumping of the CPT atomic clock; the lens and the optical cavity are arranged between the VCSEL and the 1 / 4 lambda wave plate; the lens is arranged on the side close to the VCSEL and is used for converging the laser emitted by the VCSEL into Gaussian light; the optical cavity is arranged on the side close to the 1 / 4 lambda wave plate; and the inner surface of the cavity mirror of the optical cavity comprises a reflecting mirror and is used for adjusting the amplitudes of different frequencies in the laser signal to eliminate high-order sidebands. That is, the reflecting mirror of the optical cavity can be used for adjusting the amplitudes of different frequencies in the optical signal, eliminating the high-order sidebands, simultaneously attenuating the carrier and the +1 order (or -1 order) sideband to the same amplitude, and used for interacting with alkali atoms to generate the coherent population trapping effect, so that the signal-to-noise ratio of the frequency discrimination signal can be improved.

This invention provides a rubidium atomic clock servo control system and method based on FPGA, belonging to the field of atomic frequency standard technology. The system includes a laser driving current modulation module, a microwave radio frequency synthesis module, a photoelectric signal acquisition module, a laser frequency locking module, a microwave frequency locking module, a laser temperature control module, a cavity temperature control module, and a magnetic field control module. This invention adopts FPGA digital integration of VCSEL driving current modulation, high-precision microwave radio frequency signal generation, and digital frequency locking control to replace traditional analog circuits, reduce system complexity and cost, and improve the stability and reliability of the rubidium atomic clock.

The utility model relates to the field of atomic frequency standards, particularly provides a suspended rubidium spectral lamp and a control circuit, and aims to solve the problem that the highest working temperature of a rubidium bulb is limited in the design of a traditional rubidium spectral lamp. In order to achieve the purpose, the suspended rubidium spectral lamp comprises a thermostatic bath, a rubidium bulb arranged in the thermostatic bath, an exciting coil arranged outside the rubidium bulb and a heat insulation ring arranged between the thermostatic bath and the rubidium bulb, wherein the heat insulation ring is used for enabling the rubidium bulb to be separated from the exciting coil and the thermostatic bath. The thermal insulation ring is arranged between the thermostatic bath and the rubidium bulb, so that the rubidium bulb is separated from the exciting coil and the thermostatic bath, and the thermal resistance between the thermostatic bath and the rubidium bulb is improved. Therefore, under the common heating action of the thermostatic bath and the exciting coil, the rubidium bulb can work in the environment with the temperature higher than that of the thermostatic bath, the working temperature of the rubidium bulb is remarkably increased while the power needed by the thermostatic bath is not additionally increased, and then the light intensity of the rubidium bulb is improved.

The present invention relates to the technical field of atomic frequency standards, and in particular to a miniaturized atomic beam clock physics system and a clock generation method. The atomic beam clock physics system comprises: an alkali metal atom emission cavity, an alkali metal raw material block, a microcapillary array, a drift cavity, a multilayer silicon substrate, a laser, a fiber-optic phase modulator, a beam splitter prism, a plurality of reflecting mirrors, and a signal detector. Compared with a conventional coherent population trapping detection method based on a vapor cell, the present invention achieves a narrower fluorescence spectrum width and higher long-term frequency stability, also has a chip‑level integration capability, and has higher competitiveness compared with existing chip-scale atomic clocks based on a vapor cell structure.

The invention relates to the technical field of atomic frequency standards, in particular to a two-photon optical frequency standard based on an alkali metal atomic beam, which comprises a laser system, an atomic beam system, a detection system and a control system, wherein the laser system comprises a laser, an electro-optical modulator, a frequency multiplier, a power amplifier, an adjustable power attenuator, a polarization splitting prism, a collimating lens group, a reflector and a photoelectric detector. According to the invention, hot atoms are adopted as working atoms, a two-photon transition principle is adopted, a complex laser cooling system is avoided, and the overall miniaturization of the system is ensured; by combining the advantage of no collision frequency shift of moving atoms in an atomic beam, the defect of insufficient long-term performance caused by collision frequency shift of a traditional small-sized optical frequency scale is eliminated; the Doppler effect can be further eliminated by utilizing the characteristic that the movement rate of the atoms in the vertical direction of the center line of the atomic beam is close to zero, the narrower spectral line width is obtained, and meanwhile the characteristics of excellent long and short term stability and environmental adaptability are achieved.

The invention relates to the technical field of atomic frequency standards, in particular to a miniaturized rubidium atomic clock, which comprises a light source module, a microwave cavity module, a microwave coupling module and a control module, and is characterized in that the light source module, the microwave cavity module and the microwave coupling module are sequentially arranged along a light path; parallel light output by the light source module passes through the microwave cavity module and then is received by the microwave coupling module; the microwave coupling module and the microwave cavity module are fixedly mounted through a supporting structure; the control module is electrically connected with the light source module, the microwave cavity module and the microwave coupling module. The miniature laser is used as a light source to replace a traditional spectral lamp, so that the size and power consumption of the light source are reduced; the manufacturing of the microwave cavity and microwave feed-in are directly realized by adopting a circuit board process, the size of a physical system is further reduced, and the miniature rubidium atomic clock has the advantages of low cost, short production period and capability of realizing batch production, and is expected to realize mass production of commercial products of miniature rubidium atomic clocks.

The invention discloses a system and a method for controlling a constant-temperature crystal oscillator to output standard frequency by a cold atom fountain clock, and belongs to the technical field of atomic frequency standard, the system adopts a main control loop to lock the constant-temperature crystal oscillator and output the standard frequency when hardware and software of the cold atom fountain clock do not fail, and adopts the main control loop to lock the constant-temperature crystal oscillator and output the standard frequency when a phase comparator does not update data. Outputting first alarm information; and when at least one of the cold atom fountain clock software and the cold atom fountain clock hardware fails, locking the constant-temperature crystal oscillator by adopting the slave control loop, outputting the standard frequency, and outputting second alarm information. When the fountain clock accidentally loses efficacy, a hydrogen clock, a cesium clock or a rubidium clock is used as a backup reference source, the frequency of the constant-temperature crystal oscillator is locked by combining historical fountain clock data and utilizing a data prediction algorithm, the master control loop and the slave control loop monitor the operation state mutually, abnormal alarm is given, and the operation reliability is greatly improved.

The invention discloses a system and a method for determining atom passing time in a cold atom microwave clock, and belongs to the technical field of atom frequency standard, and the system comprises a signal control and analysis module, a microwave switch, a microwave source, a microwave cavity and an atomic transition probability detection device. A first control signal, a second control signal and a third control signal are generated, and the relationship between the atomic transition probability and microwave pulses at different moments is analyzed by using the spatial distribution of the magnetic field amplitude of the microwave standing wave field in the microwave cavity and the Labian transition in the atomic microwave clock. According to the invention, the system is small in size, is light in weight, and can effectively inhibit the microwave leakage frequency shift.