Low-frequency radio atom antenna and low-frequency radio detection method

Abstract

The invention provides a low-frequency radio atom antenna and a low-frequency radio detection method. The low-frequency radio atom antenna comprises a detection light optical fiber, a detection light lens group, a coupling light lens group, a coupling light optical fiber, an atom gas chamber, a parallel electrode plate, a coaxial cable, a passive antenna, a spectroscope and a photoelectric detector. Wherein the coupling light lens group is used for coupling light beam shrinkage, the detection light lens group is used for detecting light beam shrinkage, and the passive antenna is used for feeding in a low-frequency signal, so that measurement errors caused by access of an active electronic device can be reduced; the built-in electric field is generated through induction of high-power-density coupling light, electric field signals corresponding to radio to be detected can be amplified through the stark effect of the built-in electric field, and the low-frequency signal detection sensitivity is improved.

Description

Technical Field

[0001] The invention relates to the technical field of radio wave measurement, in particular to a low-frequency radio atomic antenna and a method for detecting low-frequency radio. Background Art

[0002] Low-frequency radio refers to a relatively low-frequency radio band, which refers to electromagnetic waves in the frequency range of 30Hz-300kHz, including super low frequency (SLF, 30Hz-300 Hz), extremely low frequency (ELF, 300Hz-3kHz), very low frequency (VLF, 3kHz-30kHz), low frequency (LF, 30kHz-300kHz) and other frequency bands. Since the wavelength of radio is inversely proportional to the frequency, the lower the frequency of the radio, the longer the wavelength of the radio. When the wavelength of low-frequency radio is much larger than the length of the receiving antenna, the radio gain coefficient of the traditional dipole-based metal antenna is small in the low-frequency band, which makes the detection sensitivity of the traditional metal antenna to low-frequency radio low.

[0003] At present, in order to achieve high-sensitivity detection of low-frequency radio, a longer receiving antenna is usually used to receive low-frequency radio, thereby improving the sensitivity of the receiving antenna to low-frequency radio detection.

[0004] However, due to factors such as the installation location and usage environment, the usage scenarios of longer receiving antennas are limited.

[0005] The new Rydberg atomic low-frequency radio receiving antenna converts low-frequency radio signals into photoelectric signals for detection, with a sensitivity limit of -190dBm / Hz, thereby significantly reducing the antenna size of traditional low-frequency radio and further improving long-wave positioning and timing accuracy and communication range.

[0006] However, due to the insufficient sensitivity of the Rydberg atomic detector's low-frequency electric field, it is still necessary to connect active electronic devices such as adder circuits (loading electrostatic fields to amplify the low-frequency signals to be measured) or low-noise amplifiers (using narrow-band filters to amplify the low-frequency signals to be measured) to increase the gain of low-frequency radio and receive signals. Low-frequency electric field measurements are easily interfered by active electronic devices, resulting in excessive thermal electron noise at the receiving end, which restricts further improvement of low-frequency radio sensitivity. Summary of the invention

[0007] The present invention provides a low-frequency radio atomic antenna and a low-frequency electric field detection method, which can reduce or eliminate the measurement error caused by the access of active electronic devices without increasing the size of the receiving antenna, and improve the sensitivity of the receiving antenna to low-frequency radio detection, so as to solve the problem that the use scenarios of the longer receiving antenna in the prior art are limited.

[0008] The technical solution of the present invention to solve the above technical problems is as follows:

[0009] In a first aspect, the present invention provides a low-frequency radio atomic antenna, comprising: a detection optical fiber, a coupling optical fiber, an atomic gas chamber, a parallel electrode plate, a coaxial cable, a passive antenna, a spectroscope and a photodetector. The atomic gas chamber is a hollow structure, the parallel electrode plate is arranged in the atomic gas chamber, one end opening of the parallel electrode plate is arranged opposite to one end of the atomic gas chamber, and the other end opening of the parallel electrode plate is arranged opposite to the other end of the atomic gas chamber. The detection optical fiber is arranged at one end of the atomic gas chamber, and the coupling optical fiber is arranged at the other end of the atomic gas chamber. The passive antenna is arranged outside the atomic gas chamber, and the passive antenna is connected to the parallel electrode plate via a coaxial cable. The spectroscope is arranged between the coupling optical fiber and the atomic gas chamber.

[0010] Among them, the atomic gas chamber is used to store Rydberg atoms of alkali metal atoms such as rubidium and cesium. The passive antenna is used to receive the radio to be detected, so as to transmit the radio to be detected to the parallel electrode plates through the coaxial cable. The detection light fiber is used to transmit the detection light to the atomic gas chamber. The coupling light fiber is used to transmit the coupling light to the atomic gas chamber, and the power density of the coupling light entering the atomic gas chamber is greater than the photoionization power density threshold. The spectroscope is used to transmit the coupling light emitted by the coupling light fiber. The detection light emitted by the detection light fiber and the coupling light emitted by the coupling light fiber overlap in the atomic gas chamber and are located between the two plates included in the parallel electrode plates. The spectroscope is also used to reflect the detection light transmitted from the atomic gas chamber to the photodetector. The photodetector is used to convert the received detection light into a corresponding photoelectric signal, which is associated with the radio to be detected.

[0011] Based on the above technical solution, the present invention can also be improved as follows.

[0012] Furthermore, it also includes a detection light lens group. The detection light lens group is arranged between the detection light optical fiber and the atomic gas chamber. The detection light lens group is used to receive the detection light emitted by the detection light optical fiber, and perform a beam reduction process and a collimation process on the received detection light, and transmit the detection light subjected to the beam reduction process and the collimation process into the atomic gas chamber.

[0013] Furthermore, the detection light lens group performs a reduction process on the received detection light in a range of 0.01 times to 10 times. The detection light lens group performs a collimation process on the received detection light in a range of 20 microns to 20 millimeters. The collimation range refers to the range of the spot diameter of the light that has been collimated.

[0014] Furthermore, it also includes a coupling light lens group. The coupling light lens group is arranged between the coupling light fiber and the spectroscope. The coupling light lens group is used to receive the coupling light emitted by the coupling light fiber, and to perform beam reduction processing and collimation processing on the received coupling light, and transmit the coupled light that has undergone the beam reduction processing and collimation processing to the spectroscope. Among them, the beam reduction processing performed on the received coupling light is used to enhance the power density of the coupling light received by the coupling light lens group; when the power density of the coupling light after the beam reduction processing is greater than the photoionization power density threshold, the photoionization effect is triggered in the atomic gas chamber to generate a laser built-in electric field between the parallel electrode plates.

[0015] Furthermore, the coupling light lens group performs a collimation process on the received coupling light, and the collimation range of the coupling light lens group is between 0.01 times and 10 times. The coupling light lens group performs a collimation process on the received coupling light, and the collimation range of the coupling light lens group is between 20 micrometers and 20 millimeters.

[0016] Furthermore, the material of the parallel electrode plate includes at least one of tungsten, copper, steel, aluminum, and nickel. The distance between the two electrodes of the parallel electrode plate is greater than twice the spot diameter of the coupled light after the coupling light lens group performs a beam reduction process.

[0017] Furthermore, the passive antenna includes any one of a loop antenna, a whip antenna, a horn antenna, a parabolic antenna, a microstrip antenna, and a reference electrode antenna.

[0018] Furthermore, the parallel electrode plate includes a positive electrode plate and a negative electrode plate. The passive antenna includes a positive terminal and a negative electrode segment; the positive terminal is connected to the positive electrode plate and the passive antenna; and the negative terminal is connected to the ground wire.

[0019] In a second aspect, the present invention provides a method for detecting low-frequency radio, which is applied to a low-frequency radio atomic antenna, wherein the low-frequency radio atomic antenna includes a detection optical fiber, a coupling optical fiber, an atomic gas chamber, a parallel electrode plate, a coaxial cable, a passive antenna, a spectroscope and a photodetector. In the method, the passive antenna receives the radio to be detected, so as to transmit the radio to be detected to the parallel electrode plate through the coaxial cable. According to the transmission direction of the radio to be detected, the orientation of the passive antenna is adjusted until the signal strength of the radio to be detected received by the passive antenna is the strongest. The detection optical fiber transmits detection light to the atomic gas chamber, and the coupling optical fiber transmits coupling light to the atomic gas chamber. The power density of the coupled light entering the atomic gas chamber is greater than the photoionization power density threshold. The detection light emitted by the detection optical fiber and the coupled light emitted by the coupling optical fiber overlap in the atomic gas chamber and are located between the two plates included in the parallel electrode plate. The spectroscope refracts the detection light transmitted from the atomic gas chamber to the photodetector. The photodetector converts the received detection light into a corresponding photoelectric signal, which is associated with the radio to be detected.

[0020] Further, the detection light lens group receives the detection light emitted by the detection light optical fiber, and performs a beam reduction process and a collimation process on the received detection light, and transmits the detection light that has undergone the beam reduction process and the collimation process to the atomic gas chamber. The coupling light lens group receives the coupling light emitted by the coupling light optical fiber, and performs a beam reduction process and a collimation process on the received coupling light, and transmits the coupling light that has undergone the beam reduction process and the collimation process to the spectroscope. The beam reduction process on the received coupling light is used to enhance the power density of the coupling light received by the coupling light lens group. When the power density of the coupling light after the beam reduction process is greater than the photoionization power density threshold, the photoionization effect is triggered in the atomic gas chamber to generate a laser built-in electric field between the parallel electrode plates.

[0021] The beneficial effects of the present invention are as follows: the low-frequency radio atomic antenna includes a coupling optical lens group for coupling optical beam shrinkage, a detection optical lens group for detecting optical beam shrinkage, and a passive antenna for feeding low-frequency signals, which can reduce the measurement error caused by the access of active electronic devices. A built-in electric field is generated by inducing high-power-density coupling light, and the Stark effect of the built-in electric field can amplify the low-frequency electric field signal to be measured, thereby achieving the improvement of the sensitivity of the receiving antenna to low-frequency radio detection on the basis of reducing the size of the receiving antenna.

[0022] In a third aspect, the present invention provides an electronic device comprising: a memory, one or more processors; the memory and the processor are coupled; wherein the memory stores computer program code, the computer program code comprises computer instructions, and when the computer instructions are executed by the processor, the electronic device executes the method for detecting low-frequency radio as described in any one of the second aspects above.

[0023] In a fourth aspect, a computer-readable storage medium is provided, comprising computer instructions. When the computer instructions are executed on an electronic device, the electronic device executes the method for detecting low-frequency radio as described in any one of the second aspects.

[0024] In a fifth aspect, a computer program product is provided. When the computer program product is run on a computer, the computer executes the method for detecting low-frequency radio as described in any one of the second aspects.

[0025] It can be understood that the beneficial effects that can be achieved by the electronic device described in the third aspect, the computer-readable storage medium described in the fourth aspect, and the computer program product described in the fifth aspect can be referred to the beneficial effects in the first aspect and any possible design thereof, as well as the second aspect and any possible design thereof, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the structure of a low-frequency radio atomic antenna provided by the present invention;

[0027] Figure 2 A schematic flow chart of a method for detecting low-frequency radio provided by the present invention.

[0028] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0029] 1. Detection optical fiber, 2. Coupling optical fiber, 3. Atomic gas chamber, 4. Parallel electrode plates, 5. Coaxial cable, 6. Passive antenna, 7. Spectroscope, 8. Photodetector, 9. Detection optical lens group, 10. Coupling optical lens group. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Among them, in the description of the present application, unless otherwise specified, " / " indicates that the objects associated before and after are in an "or" relationship, for example, A / B can represent A or B; "and / or" in the present application is only a description of the association relationship of the associated objects, indicating that there can be three relationships, for example, A and / or B, which can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. And, in the description of the present application, unless otherwise specified, "multiple" refers to two or more than two. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple. In addition, in order to facilitate the clear description of the technical solutions of the embodiments of the present application, in the embodiments of the present application, the words "first", "second" and the like are used to distinguish between the same items or similar items with substantially the same functions and effects. Those skilled in the art will understand that the words "first", "second" and the like do not limit the quantity and execution order, and the words "first", "second" and the like do not necessarily limit the differences. At the same time, in the embodiments of the present application, the words "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or design.

[0031] When the wavelength of low-frequency radio is much larger than the length of the receiving antenna, the radio gain coefficient of the traditional dipole-based metal antenna is small in the low-frequency band, which makes the traditional metal antenna have low detection sensitivity to low-frequency radio. In order to achieve high-sensitivity detection of low-frequency radio, a longer receiving antenna is usually used to receive low-frequency radio, thereby improving the sensitivity of the receiving antenna to low-frequency radio detection.

[0032] However, due to factors such as the installation location and usage environment, the usage scenarios of longer receiving antennas are limited.

[0033] In a related technology, the new Rydberg atomic low-frequency radio receiving antenna can convert low-frequency radio signals into photoelectric signals for detection, with a sensitivity limit of -190dBm / Hz, thereby significantly shortening the antenna length of traditional low-frequency radio and improving long-wave positioning and timing accuracy and communication range.

[0034] However, the above technology is limited by the insufficient sensitivity of Rydberg to detect low-frequency electric fields, and still needs to be connected to active electronic devices such as adder circuits (loading electrostatic fields to amplify the low-frequency signals to be measured) or low-noise amplifiers (amplifying the low-frequency signals to be measured through narrowband filters) to increase the gain of low-frequency radio and receive signals. Low-frequency electric field measurements are easily interfered by active electronic devices, resulting in excessive thermal electron noise of low-frequency radio received by the receiving antenna, which restricts the sensitivity of the receiving antenna to low-frequency radio detection.

[0035] Based on the above problems, the present invention provides a low-frequency radio atomic antenna and a method for detecting low-frequency radio, wherein the low-frequency radio atomic antenna includes a coupling optical lens group for coupling optical beam shrinkage, a detection optical lens group for detecting optical beam shrinkage, and a passive antenna for feeding low-frequency signals, which can reduce the measurement error caused by the access of active electronic devices. A built-in electric field is generated by inducing high-power density coupled light, and the Stark effect of the built-in electric field can amplify the low-frequency electric field signal to be measured, thereby achieving the improvement of the sensitivity of the receiving antenna to low-frequency radio detection on the basis of reducing the size of the receiving antenna.

[0036] Figure 1 The schematic diagram of the structure of a low-frequency radio atomic antenna provided by the present invention is shown in FIG. Figure 1 As shown, the low-frequency radio atomic antenna provided by the present invention includes: a detection optical fiber 1, a coupling optical fiber 2, an atomic gas chamber 3, a parallel electrode plate 4, a coaxial cable 5, a passive antenna 6, a spectroscope 7 and a photodetector 8.

[0037] Among them, the atomic gas chamber 3 is a hollow structure, the parallel electrode plate 4 is arranged in the atomic gas chamber 3, one end opening of the parallel electrode plate 4 is arranged opposite to one end of the atomic gas chamber 3, and the other end opening of the parallel electrode plate 4 is arranged opposite to the other end of the atomic gas chamber 3. The detection optical fiber 1 is arranged at one end of the atomic gas chamber 3, and the coupling optical fiber 2 is arranged at the other end of the atomic gas chamber 3. The passive antenna 6 is arranged outside the atomic gas chamber 3, and the passive antenna 6 is connected to the parallel electrode plate 4 through a coaxial cable 5. The spectroscope 7 is arranged between the coupling optical fiber 2 and the atomic gas chamber 3.

[0038] The passive antenna 6 is used to receive the radio to be detected, so as to transmit the radio to be detected to the parallel electrode plate 4 through the coaxial cable 5. The detection light fiber 1 is used to transmit the detection light to the atomic gas chamber 3. The coupling light fiber 2 is used to transmit the coupling light to the atomic gas chamber 3, and the power density of the coupling light entering the atomic gas chamber 3 is greater than the photoionization power density threshold. The spectroscope 7 is used to transmit the coupling light emitted by the coupling light fiber 2. The detection light emitted by the detection light fiber 1 and the coupling light emitted by the coupling light fiber 2 overlap in the atomic gas chamber 3 and are located between the two plates included in the parallel electrode plate 4.

[0039] The spectroscope 7 is also used to reflect the detection light transmitted from the atomic gas chamber 3 to the photodetector 8. The photodetector is used to convert the received detection light into a corresponding photoelectric signal, which is associated with the radio to be detected.

[0040] Specifically, the combination of the detection light and the coupling light located between the two plates included in the parallel electrode plate 4 can excite the outermost electrons of the Rydberg atoms to orbits with higher principal quantum numbers, so that the distance between the electrons and the atomic nucleus can reach the micrometer level, with a very large electric dipole moment. This makes the Rydberg atoms extremely sensitive to electromagnetic fields and can interact strongly with external electromagnetic fields such as microwave radiation. In addition, when the coupling light power density is strong enough, a photoionization effect will be generated, which can ensure that a laser built-in electric field is generated between the parallel electrode plates 4 to amplify the signal strength of the radio to be detected transmitted by the passive antenna 6, and further increase the detection sensitivity of the Rydberg atoms in the atomic gas chamber 3 to the radio to be detected.

[0041] In some embodiments, the low-frequency radio atomic antenna provided by the present invention further includes a detection light lens group 9.

[0042] The detection light lens group 9 is arranged between the detection light optical fiber 1 and the atomic gas chamber 3. The detection light lens group 9 is used to receive the detection light emitted by the detection light optical fiber 1, and to perform a beam reduction process and a collimation process on the received detection light, and to transmit the detection light subjected to the beam reduction process and the collimation process into the atomic gas chamber 3.

[0043] In some embodiments, the reduction ratio of the detection light lens group 9 in the reduction processing of the received detection light is adjustable. Specifically, the reduction range of the detection light lens group 9 in the reduction processing of the received detection light is between 0.01 times and 10 times.

[0044] In some embodiments, the collimation ratio of the detection light lens group 9 to the received detection light is adjustable. Specifically, the collimation range of the detection light lens group 9 to the received detection light is between 20 microns and 20 millimeters. The collimation range refers to the range of the spot diameter of the light that has been collimated.

[0045] In some embodiments, the low-frequency radio atomic antenna provided by the present invention further includes a coupling light lens group 10 .

[0046] The coupling light lens group 10 is arranged between the coupling light fiber 2 and the spectroscope 7. The coupling light lens group 10 is used to receive the coupling light emitted by the coupling light fiber 2, and to perform a beam reduction process and a collimation process on the received coupling light, and transmit the coupled light subjected to the beam reduction process and the collimation process to the spectroscope 7.

[0047] It should be noted that the received coupled light is subjected to a beam reduction process to enhance the power density of the coupled light received by the coupled light lens group. When the power density of the coupled light after the beam reduction process is greater than the photoionization power density threshold, a photoionization effect will be triggered in the atomic gas chamber 3 to generate a laser built-in electric field between the parallel electrode plates 4.

[0048] In some embodiments, the reduction ratio of the received coupling light by the coupling light lens group 10 is adjustable. Specifically, the reduction range of the received coupling light by the coupling light lens group 10 is between 0.01 times and 10 times.

[0049] In some embodiments, the collimation ratio of the received coupling light performed by the coupling light lens group 10 is adjustable. Specifically, the collimation range of the received coupling light performed by the coupling light lens group 10 is between 20 micrometers and 20 millimeters.

[0050] In some embodiments, the material of the parallel electrode plates 4 includes at least one of tungsten, copper, steel, aluminum, and nickel.

[0051] In some embodiments, the material of the atomic gas chamber 3 includes any one of transparent materials such as sapphire, quartz, lithium niobate, microcrystalline glass, various glasses, etc.

[0052] In some embodiments, the passive antenna 6 includes any one of passive miniaturized antennas such as a loop antenna, a whip antenna, a horn antenna, a parabolic antenna, a microstrip antenna, a reference electrode antenna, etc. The length of the passive antenna 6 is 0.001 m-1 m.

[0053] In some embodiments, the coaxial cable 5 is a cable with multi-layer shielding and excellent electromagnetic shielding performance. The coaxial cable 5 includes a positive terminal and a negative terminal.

[0054] In some embodiments, the parallel electrode plate 4 includes a positive electrode plate and a negative electrode plate. The positive electrode plate and the negative electrode plate are arranged parallel and opposite to each other. The positive terminal of the coaxial cable 5 is connected to the positive electrode plate of the parallel electrode plate 4 and the passive antenna 6; the negative terminal of the coaxial cable 5 is connected to the ground wire.

[0055] In some embodiments, the spacing between the parallel electrode plates 4 is slightly larger than the spot of the laser (including the detection light and the coupling light), ranging from 0.1 to 10 mm. The size of the parallel electrode plates 4 is much larger than the spot size of the laser, ranging from 10 to 100 mm.

[0056] Specifically, the distance between the two electrodes of the parallel electrode plate 4 may be greater than twice the spot diameter of the coupling light after the coupling light lens group performs the beam reduction process.

[0057] The present invention also provides a method for detecting low-frequency radio, which is applied to a low-frequency radio atomic antenna provided by the present invention. Figure 2 The present invention provides a method for detecting low-frequency radio, comprising the following steps:

[0058] S201: The passive antenna receives the radio to be detected, so as to transmit the radio to be detected to the parallel electrode plates through the coaxial cable.

[0059] In some embodiments, the positive terminal of the coaxial cable is connected to the passive antenna and the leads of the parallel electrode plates inside the atomic gas chamber, and the negative terminal of the coaxial cable is connected to the ground wire.

[0060] S202: Adjust the direction of the passive antenna according to the transmission direction of the radio to be detected until the signal strength of the radio to be detected received by the passive antenna is the strongest.

[0061] S203: The detection light optical fiber transmits the detection light to the atomic gas chamber, and the coupling light optical fiber transmits the coupling light to the atomic gas chamber.

[0062] The power density of the coupled light entering the atomic gas chamber is greater than the photoionization power density threshold. The detection light emitted by the detection light fiber and the coupling light emitted by the coupling light fiber overlap in the atomic gas chamber and are located between the two plates included in the parallel electrode plate.

[0063] Specifically, the passive antenna and the parallel electrode plates inside the atomic gas chamber can be connected through the positive end of the high-shielded coaxial cable, and the ground wire can be connected through the negative end of the high-shielded coaxial cable. When adjusting the optical paths of the detection light and the coupling light, ensure that the detection light and the coupling light are transmitted in opposite directions and overlap between the parallel electrode plates inside the atomic gas chamber.

[0064] In some embodiments, the detection light can be subjected to beam shrinking and collimation processing by a detection light lens group, and the detection light subjected to beam shrinking and collimation processing can be transmitted into the atomic gas chamber.

[0065] By performing a beam reduction process on the detection light, it can be ensured that the detection light spot size is smaller than or equal to the coupling light spot size.

[0066] In some embodiments, the coupled light can be subjected to beam reduction and collimation processing through a coupling light lens group, and the coupled light subjected to the beam reduction and collimation processing can be transmitted into the atomic gas chamber.

[0067] Among them, the power density of the coupled light can be enhanced by performing a beam reduction process on the coupled light. When the power density of the coupled light is strong enough, a photoionization effect will occur, ensuring that a laser built-in electric field is generated between the parallel electrode plates.

[0068] S204: The spectroscope refracts the detection light transmitted from the atomic gas chamber to the photodetector.

[0069] S205: The photoelectric detector converts the received detection light into a corresponding photoelectric signal.

[0070] In some embodiments, the photoelectric signal output by the photodetector can be transmitted to an oscilloscope, a spectrum analyzer, an acquisition card or other instruments for processing and analysis, and the information carried by the radio to be detected can be demodulated through the photoelectric signal.

[0071] It can be seen that the detection method for low-frequency radio provided by the present invention can use a passive small-size antenna to receive low-frequency radio, which can reduce or eliminate the measurement error caused by the access of active electronic devices. The built-in electric field is generated by inducing high-power density coupled light, and the Stark effect of the built-in electric field can amplify the low-frequency electric field signal to be measured, so as to improve the sensitivity of the receiving antenna to low-frequency radio detection.

[0072] In some schemes, multiple embodiments of the present application can be combined, and the combined scheme can be implemented. Optionally, some operations in the process of each method embodiment are optionally combined, and / or the order of some operations is optionally changed. In addition, the execution order between the steps of each process is only exemplary and does not constitute a restriction on the execution order between the steps. There can also be other execution orders between the steps. It is not intended to indicate that the execution order is the only order in which these operations can be performed. A person of ordinary skill in the art will think of a variety of ways to reorder the operations described herein. In addition, it should be noted that the process details involved in a certain embodiment of this article are also applicable to other embodiments in a similar manner, or different embodiments can be used in combination.

[0073] In addition, some steps in the method embodiment may be equivalently replaced by other possible steps. Alternatively, some steps in the method embodiment may be optional and may be deleted in certain usage scenarios. Alternatively, other possible steps may be added to the method embodiment. Furthermore, the method embodiments may be implemented separately or in combination.

[0074] Through the description of the above implementation methods, technical personnel in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the antenna can be divided into different functional modules to complete all or part of the functions described above.

[0075] In the several embodiments provided in the present application, it should be understood that the disclosed antennas and methods can be implemented in other ways. For example, the antenna embodiments described above are only schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another antenna, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection of the antenna or unit can be electrical, mechanical or other forms.

[0076] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0077] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application is essentially or the part that contributes or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium, including several instructions to enable a device (which can be a single-chip microcomputer, chip, etc.) or a processor (processor) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk and other media that can store program code.

[0078] The above contents are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application shall be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A low frequency radio atomic antenna, characterized in that: include: A detection optical fiber (1), a coupling optical fiber (2), an atomic gas chamber (3), a parallel electrode plate (4), a coaxial cable (5), a passive antenna (6), a spectroscope (7) and a photodetector (8); The atomic gas chamber (3) is a hollow structure, the parallel electrode plate (4) is arranged in the atomic gas chamber (3), one end opening of the parallel electrode plate (4) is arranged opposite to one end of the atomic gas chamber (3), and the other end opening of the parallel electrode plate (4) is arranged opposite to the other end of the atomic gas chamber (3); the detection optical fiber (1) is arranged at one end of the atomic gas chamber (3); the coupling optical fiber (2) is arranged at the other end of the atomic gas chamber (3); the passive antenna (6) is arranged outside the atomic gas chamber (3), and the passive antenna (6) is connected to the parallel electrode plate (4) through the coaxial cable (5); the spectroscope (7) is arranged between the coupling optical fiber (2) and the atomic gas chamber (3); The atomic gas chamber (3) is used to store Rydberg atoms; the passive antenna (6) is used to receive the radio to be detected, so as to transmit the radio to be detected to the parallel electrode plate (4) through the coaxial cable (5); the detection light fiber (1) is used to transmit detection light to the atomic gas chamber (3); the coupling light fiber (2) is used to transmit coupling light to the atomic gas chamber (3); the power density of the coupling light entering the atomic gas chamber (3) is greater than the photoionization power density threshold; the spectroscope (7) is used to transmit the coupling light emitted by the coupling light fiber (2); the detection light emitted by the detection light fiber (1) and the coupling light emitted by the coupling light fiber (2) overlap in the atomic gas chamber (3) and are located between the two plates included in the parallel electrode plate (4); the spectroscope (7) is also used to reflect the detection light transmitted from the atomic gas chamber (3) to the photodetector (8); the photodetector is used to convert the received detection light into a corresponding photoelectric signal; the photoelectric signal is associated with the radio to be detected.

2. The low frequency radio atomic antenna according to claim 1, characterized in that: Also includes: A detection light lens group (9); the detection light lens group (9) is arranged between the detection light optical fiber (1) and the atomic gas chamber (3); the detection light lens group (9) is used to receive the detection light emitted by the detection light optical fiber (1), and to perform a beam reduction process and a collimation process on the received detection light, and to transmit the detection light that has undergone the beam reduction process and the collimation process into the atomic gas chamber (3).

3. The low frequency radio atomic antenna according to claim 2, characterized in that: The detection light lens group (9) performs a reduction processing on the received detection light in a range of 0.01 times to 10 times; the detection light lens group (9) performs a collimation processing on the received detection light in a range of 20 micrometers to 20 millimeters; the collimation range refers to the range of the spot diameter of the light that has undergone the collimation processing.

4. The low frequency radio atomic antenna according to claim 3, characterized in that: Also includes: A coupling light lens group (10); the coupling light lens group (10) is arranged between the coupling light optical fiber (2) and the beam splitter (7); the coupling light lens group (10) is used to receive the coupling light emitted by the coupling light optical fiber (2), and to perform beam reduction processing and collimation processing on the received coupling light, and transmit the coupled light that has undergone the beam reduction processing and collimation processing to the beam splitter (7); the beam reduction processing performed on the received coupling light is used to enhance the power density of the coupling light received by the coupling light lens group; when the power density of the coupled light after the beam reduction processing is greater than the photoionization power density threshold, the photoionization effect is triggered in the atomic gas chamber (3) to generate a laser built-in electric field between the parallel electrode plates (4).

5. The low frequency radio atomic antenna according to claim 4, characterized in that: Also includes: The coupling light lens group (10) performs a shrinking process on the received coupling light, and the shrinking range of the shrinking process is between 0.01 times and 10 times; the coupling light lens group (10) performs a collimation process on the received coupling light, and the collimation range of the collimation process is between 20 micrometers and 20 millimeters.

6. The low frequency radio atomic antenna according to claim 5, characterized in that: The material of the parallel electrode plate (4) includes at least one of tungsten, copper, steel, aluminum, and nickel; the distance between two electrode plates included in the parallel electrode plate (4) is greater than twice the spot diameter of the coupled light after the coupled light lens group (10) performs a beam reduction process.

7. The low frequency radio atomic antenna according to claim 6, characterized in that: The passive antenna (6) comprises any one of a loop antenna, a whip antenna, a horn antenna, a parabolic antenna, a microstrip antenna, and a reference electrode antenna.

8. The low frequency radio atomic antenna according to claim 7, characterized in that: The parallel electrode plate (4) comprises a positive plate and a negative plate; the passive antenna (6) comprises a positive terminal and a negative segment; the positive terminal is connected to the positive plate and the passive antenna (6); and the negative terminal is connected to a ground wire.

9. A method for detecting low-frequency radio, applied to a low-frequency radio atomic antenna, wherein the low-frequency radio atomic antenna comprises a detection optical fiber, a coupling optical fiber, an atomic gas chamber, parallel electrode plates, a coaxial cable, a passive antenna, a spectroscope and a photodetector, characterized in that: include: The passive antenna receives the radio to be detected, so as to transmit the radio to be detected to the parallel electrode plate through the coaxial cable; According to the transmission direction of the radio to be detected, the orientation of the passive antenna is adjusted until the signal strength of the radio to be detected received by the passive antenna is the strongest; The detection light fiber emits detection light to the atomic gas chamber, and the coupling light fiber emits coupling light to the atomic gas chamber; the power density of the coupling light entering the atomic gas chamber is greater than the photoionization power density threshold; the detection light emitted by the detection light fiber and the coupling light emitted by the coupling light fiber overlap in the atomic gas chamber and are located between the two plates included in the parallel electrode plates; The beam splitter refracts the detection light transmitted from the atomic gas chamber to the photoelectric detector; The photodetector converts the received detection light into a corresponding photoelectric signal.

10. The method for detecting low-frequency radio according to claim 9, characterized in that: Also includes: The detection light lens group receives the detection light emitted by the detection light optical fiber, performs a beam reduction process and a collimation process on the received detection light, and transmits the detection light subjected to the beam reduction process and the collimation process into the atomic gas chamber; The coupling light lens group receives the coupling light emitted by the coupling light optical fiber, performs a beam reduction process and a collimation process on the received coupling light, and transmits the coupled light that has undergone the beam reduction process and the collimation process to the spectroscope; the beam reduction process on the received coupling light is used to enhance the power density of the coupling light received by the coupling light lens group; when the power density of the coupled light after the beam reduction process is greater than the photoionization power density threshold, the photoionization effect is triggered in the atomic gas chamber to generate a laser built-in electric field between the parallel electrode plates.

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