Multi-channel atomic magnetic detector

Abstract

The present invention provides a multi-channel atomic magnetic detector, which includes at least one detection component. Each detection component includes: a plurality of detection gas chambers on the same plane; and a beam splitting member for distributing polarized light beams from a light source to each detection gas chamber in the detection component. Among them, the plurality of detection gas chambers in each group of detection gas chambers are arranged centrosymmetrically or axially symmetrically with respect to the center of the beam splitting member. The multi-channel atomic magnetic detector has a high detection density and is beneficial to reducing noise.

Description

Technical Field

[0001] The present invention relates to an atomic magnetic detector, in particular to a multi-channel atomic magnetic detector. Background Art

[0002] Optical pumping atomic detection technology is a technology that polarizes atomic gas through a light beam and uses the magnetic effect of atomic spin to measure weak magnetic fields. Since the 1990s, with the discovery of new physical effects of atomic spin, new manipulation principles and methods, especially since 2002 when humans began to be able to manipulate atomic spin to achieve the spin exchange relaxation free (SERF) state, the research on achieving ultra-high sensitive magnetic field measurement based on the precession of atomic spin in the SERF state has begun to attract people's attention. This method can greatly exceed the sensitivity achieved by existing related measurement means, enabling humans to obtain a new tool for understanding the world. The atomic magnetometer based on optical pumping atomic detection technology can work at room temperature, without liquid helium cooling, is small in size and light in weight, and can be mass-produced at low cost through semiconductor processes, bringing new hope for weak magnetic field detection in magnetoencephalography, magnetocardiography and other medical, biological, and material fields.

[0003] The SERF mechanism was first discovered by Professor Happer of Princeton University and others in 1973. In 2002, a group led by Professor Romalis of Princeton University demonstrated an atomic magnetometer based on the SERF principle for the first time, with a single-channel sensitivity of 7 fT / Hz 1 / 2 and currently reaching 0.16 fT / Hz 1 / 2 , exceeding the level that the best SQUID magnetometer can achieve (0.91 fT / Hz 1 / 2 ).

[0004] Chinese Patent Publication CN108459282A describes an atomic magnetometer / magnetic gradiometer, which includes a detection gas chamber, a laser light source, a modulation coil, and a detection device. The excitation light beam generated by the laser light source polarizes the alkali metal vapor in the detection gas chamber. The modulation coil generates a modulation magnetic field with a known intensity for the alkali metal vapor. The detection light beam generated by the laser light source is detected by the detection device after passing through the alkali metal vapor, so as to obtain the magnetic field strength or gradient information to be measured at the detection gas chamber based on the modulation magnetic field. In a single such atomic magnetometer / gradiometer, only one detection gas chamber is included, that is, it is single-channel detection.

[0005] Currently, all existing miniaturized atomic magnetic detectors are single-channel magnetometers or magnetic gradiometers. Limited by factors such as housing size, processing difficulty, and crosstalk of modulation coils, the detection point density is low, making it difficult to perform high-density measurements. In addition, each magnetometer or magnetic gradiometer uses an independent light source. Not only is the manufacturing cost high for each channel, but the differences in light intensity and polarization between different light sources result in significant differences in the signal local noise levels between detectors. It is difficult to obtain good results when performing gradient calculations and noise reduction processing for adjacent detectors. Summary of the Invention

[0006] In order to solve the problems existing in the prior art, the purpose of the present invention is to provide a multi-channel atomic magnetic detector, which includes: at least one detection component, and each detection component includes: a plurality of detection gas chambers on the same plane; and a beam splitting member for distributing polarized light beams from a light source to the plurality of detection gas chambers, wherein the plurality of detection gas chambers in each group of detection gas chambers are arranged centrosymmetrically or axially symmetrically with respect to the center of the beam splitting member.

[0007] Since the plurality of detection gas chambers are arranged centrosymmetrically or axially symmetrically with respect to the center of the beam splitting member and receive the beam splitting of the beam splitting member, multi-channel detection is realized. This atomic magnetic detector has a simple structure, high detection density, is easy to suppress noise, and the relative positions of the plurality of detection gas chambers are fixed.

[0008] In one embodiment, the beam splitting member is used to distribute a polarized light beam from the same light source to each detection gas chamber in the detection component.

[0009] In one embodiment, the plurality of detection gas chambers in each group of detection gas chambers are arranged axially symmetrically with respect to the beam splitting member. And, the beam splitting member distributes each polarized light beam in a plurality of polarized light beams from a plurality of light sources to the axially symmetric detection gas chambers among the plurality of detection gas chambers respectively, wherein each detection gas chamber receives at least one polarized light beam.

[0010] Furthermore, in one embodiment, at least a part of the plurality of detection gas chambers can receive two polarized light beams or a widened polarized light beam.

[0011] In one embodiment, the multi-channel atomic magnetic detector further includes a housing for accommodating the at least one detection component.

[0012] In one embodiment, the light source is accommodated in the housing.

[0013] In one embodiment, the light source is arranged outside the housing.

[0014] In one embodiment, each detection component further includes a plurality of photoelectric sensors, which are used to detect information of polarized light beams passing through corresponding detection gas chambers, are arranged on the optical path after the corresponding detection gas chambers, and are also centrosymmetric or axially symmetric with respect to the center of the beam splitting member.

[0015] In one embodiment, each detection component further includes a plurality of polarization devices, which are used to convert polarized light beams into circularly polarized light beams, are arranged on the optical path between the beam splitting member and the corresponding detection gas chambers, and are also centrosymmetric or axially symmetric with respect to the center of the beam splitting member.

[0016] In one embodiment, each detection component includes modulation coils, and a plurality of detection gas chambers of each detection component share the same set of modulation coils.

[0017] In this embodiment, since a plurality of detection gas chambers share a set of modulation coils, crosstalk problems caused by using multiple sets of modulation coils are avoided, and the volume of the detector is reduced.

[0018] In another embodiment, each detection component further includes multiple sets of modulation coils, each set of modulation coils is arranged relative to each detection gas chamber, and is cooperatively controlled by a common controller.

[0019] In this embodiment, the cooperative control of multiple sets of modulation coils helps to reduce crosstalk.

[0020] In one embodiment, the atomic magnetic detector includes two or more detection components, and the two or more detection components are respectively arranged on planes parallel to each other and offset from each other.

[0021] In this embodiment, the detection density is further improved.

[0022] In one embodiment, the atomic magnetic detector includes two or more detection components, and the two or more detection components are arranged on the same plane and offset from each other parallel to the plane.

[0023] In this embodiment, the detection density is further improved.

[0024] In one embodiment, the beam splitting members of the two or more detection components distribute a common polarized light beam from a common light source to each detection gas chamber.

[0025] In this embodiment, each detection gas chamber of the two or more detection components uses light derived from a common polarized light beam, so it is beneficial to reduce detection noise.

[0026] In one embodiment, each detection component includes four detection gas chambers, which are evenly spaced and centrosymmetrically arranged with respect to the beam splitting member on the same plane.

[0027] In one embodiment, each detection component includes two detection gas chambers, which are arranged axially symmetrically with respect to the spectroscopic component on the same plane.

[0028] In one embodiment, each detection component includes four detection gas chambers, which are arranged axially symmetrically with respect to the spectroscopic component on the same plane, wherein two detection gas chambers are adjacent to each other, and the other two detection gas chambers are adjacent to each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present disclosure, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0030] Figure 1 A perspective view of an atomic magnetic detector according to a first embodiment of the present invention is shown;

[0031] Figure 2 A perspective view of an atomic magnetic detector according to a second embodiment of the present invention is shown. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] Hereinafter, an atomic magnetic detector according to an embodiment of the present disclosure will be described in detail with reference to the drawings. To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are some, but not all, of the embodiments of the present disclosure.

[0033] Therefore, the following detailed description of the embodiments of the present disclosure provided in conjunction with the drawings is not intended to limit the scope of the present disclosure claimed, but merely represents selected embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts fall within the scope of protection of the present disclosure. In addition, descriptions of well-known functions and structures may be omitted for clarity and conciseness.

[0034] The terms and words used in the following description and claims are not limited to their bibliographical meanings, but are used by the inventors to convey a clear and consistent understanding of the present disclosure. Therefore, those skilled in the art should understand that the following description of the various embodiments of the present disclosure is for illustrative purposes only and not for the purpose of limiting the present disclosure defined by the appended claims and their equivalents.

[0035] As used in the present invention, the use of "an embodiment" or "the embodiment" does not mean that the features described in one embodiment of the present invention can only be used in that embodiment, but rather the features of one embodiment can also be used in other embodiments or combined with the features in other embodiments to obtain yet another embodiment, and all such embodiments should fall within the protection scope of the present invention.

[0036] Figure 1 A perspective view of an atomic magnetic detector 100 according to a first embodiment of the present invention is shown.

[0037] As Figure 1 As shown, the atomic magnetic detector 100 includes a detection component, and the detection component includes a spectroscopic member 110, a polarization device 120, a detection gas chamber 130, a photodetector 140, a modulation coil 150, a magnetic field compensation coil 160, and a housing (not shown). The housing houses the spectroscopic member 110, the polarization device 120, the detection gas chamber 130, the photodetector 140, the modulation coil 150, and the magnetic field compensation coil 160.

[0038] In this embodiment, there are four detection gas chambers 130. The four detection gas chambers 130 are arranged on the same plane and are symmetrically arranged with respect to the center of the spectroscopic member 110, and the four detection gas chambers 130 share the spectroscopic member 110.

[0039] In this embodiment, the housing of the atomic magnetic detector 100 includes a plurality of detection gas chambers 130, effectively realizing multi-channel magnetic field intensity or magnetic gradient detection. Since the plurality of detection gas chambers 130 are symmetrically arranged around the center of the same spectroscopic member 110 and receive spectroscopy from the spectroscopic member 110, the detection density is significantly improved, and the relative positions of the plurality of detection gas chambers 130 in the atomic magnetic detector 100 are fixed and stable. In addition, the structural design of this central symmetric arrangement is simple, and the assembly and manufacturing costs are low.

[0040] The atomic magnetic detector may further include a laser light source (not shown) and a collimating device (not shown). The laser light source is used to generate a polarized light beam with specific wavelength and polarization characteristics as needed, and the polarized light beam is incident on the spectroscopic member 110 after being processed such as collimation. The spectroscopic member 110 then distributes the received polarized light beam to each detection gas chamber 130. In this example, one laser light source generates one polarized light beam, and the spectroscopic member 110 distributes the polarized light beam to each detection gas chamber 130.

[0041] In an embodiment, four detection gas chambers 130 that are arranged centrosymmetrically around the center of the beam splitting member 110 and evenly spaced share the same beam splitting member 110 to use the same polarized light beam from the same light source. Therefore, compared with the case where multiple detection gas chambers 130 each use different polarized light beams from different light sources, the influence of noise differences between polarized light beams on magnetic information detection is eliminated or reduced, and the noise reduction efficiency is improved, which is particularly advantageous when the atomic magnetic detector 100 is based on magnetic gradient measurement, and the gradient noise reduction efficiency is improved.

[0042] In this example, the atomic magnetic detector 100 includes an internal laser light source, and four detection gas chambers 130 share the same internal laser light source. In this example, since multiple detection gas chambers 130 share the same laser light source, the number and cost of laser light sources used are reduced, the volume occupied by the atomic magnetic detector 100 is reduced, and it has a higher detection density. The laser light source shared by multiple detection gas chambers 130 is not limited to one, and in addition to one laser light source, the atomic magnetic detector 100 may further include another spare laser light source.

[0043] In other examples, the laser light source may be arranged outside the housing, and then the polarized light beam generated by the laser light source is guided to the beam splitting member through an optical guiding device such as an optical fiber. In this example, multiple detection gas chambers 130 share the beam splitting member 110 and receive polarized light beams derived from the same polarized light beam, so it is also beneficial to reduce the volume occupied by the atomic magnetic detector 100 and make it have a higher detection density, and it is also beneficial to reduce detection noise.

[0044] As Figure 1 shown, the beam splitting member 110 may be a pyramid-shaped prism having four 45° inclined planes. Each inclined plane faces a detection gas chamber 130, so that the beam splitting member 110 reflects the received polarized light beam propagating in the vertical direction into multiple polarized light beams propagating in the horizontal direction perpendicular to the vertical direction and distributes each polarized light beam to each corresponding detection gas chamber 130.

[0045] The detection gas chamber 130 contains an alkali metal gas. The polarized light beam can be used to polarize alkali metal atoms and can be used to detect the precession behavior of alkali metal atoms. The modulation coil 150 is used to generate a modulation magnetic field with a known intensity, and the modulation magnetic field with the known intensity is superimposed on the detected magnetic field to act on the polarized alkali metal atoms together. The polarized light beam for detection passes through the detection gas chamber 130 to interact with alkali metal atoms, so that the polarization state of the light field of the polarized light beam changes.

[0046] In this embodiment, there are four photodetectors 140. Each photodetector 140 is arranged on the optical path after each detection chamber 130 and is also centrosymmetric with respect to the beam splitting member 110. Each photodetector 140 receives and detects the polarized light beam passing through the corresponding detection chamber 130 to obtain information related to the magnetic field to be measured at the detection chamber 130, such as magnetic intensity information or magnetic gradient information.

[0047] In addition, there are four polarization devices 120. Each polarization device 120 is arranged on the optical path between the beam splitting member 110 and the detection chamber 130 and is used to convert the polarized light beam to be guided to the detection chamber 130 into a circularly polarized light beam. The polarization device 120 can be a quarter-wave plate.

[0048] In this embodiment, the four detection chambers 130 share a set of modulation coils 150. A set of modulation coils 150 represents one or more pairs of modulation coils 150 that act together to generate an effective modulation magnetic field. For example, in this example, a set of modulation coils 150 can be a pair of separate coils, or it can be three pairs of coils arranged in three mutually perpendicular directions.

[0049] It is advantageous for the four detection chambers 130 to share a set of modulation coils 150, which can reduce the cost of using coils, eliminate the crosstalk between multiple modulation coils 150 generated when each detection chamber 130 uses a separate modulation coil 150, and enable the detection chambers 130 in the atomic magnetic detector 100 to be closer to each other. Compared with the traditional single-channel atomic magnetic detector, the atomic magnetic detector 100 according to this embodiment has a high detection density and a small occupied volume.

[0050] In addition, it should be noted that the four detection chambers 130 do not necessarily share a set of modulation coils 150, and the present invention is not limited thereto. In other examples, the atomic magnetic detector 100 can have four sets of modulation coils for the four detection chambers 130 respectively. The four sets of modulation coils are cooperatively controlled by a common controller for multi-channel detection and to reduce crosstalk.

[0051] According to this embodiment, the atomic magnetic detector 100 further includes four sets of magnetic compensation coils 160. For the purpose of clarity, only a set of magnetic compensation coils 160 arranged around one detection chamber 130 is shown in Figure 1 while the other three sets of magnetic compensation coils 160 arranged around the other three detection chambers are omitted. Each set of magnetic compensation coils 160 is respectively used to perform magnetic field compensation for each detection chamber 130 to cancel the environmental noise magnetic field. In this example, the magnetic compensation coils 160 are three pairs of Helmholtz coils.

[0052] In addition, in other embodiments, the modulation coil 150 can also be used as a compensation coil for magnetic field compensation, without the need to provide a separate magnetic compensation coil 160. In yet another embodiment, four detection chambers 130 can share a set of magnetic compensation coils 160.

[0053] It should be noted that those skilled in the art should understand that the number of detection chambers 130 is not limited to 4, and it can also be 3, 5, 6, etc., preferably 4, as long as they are arranged centrosymmetrically with respect to the center of the beam splitting member 110. Arranging 4 detection chambers 130 evenly spaced is beneficial to simplifying the structures of the beam splitting member 110 and the polarization device 120, etc.

[0054] In another embodiment, multiple detection chambers 130 are arranged centrosymmetrically, and several of the multiple detection chambers 130 can be adjacent to each other, rather than being arranged evenly spaced.

[0055] Figure 2 A perspective view of an atomic magnetic detector 200 according to a second embodiment of the present invention is shown.

[0056] As Figure 2 shown, similar to the atomic magnetic detector 100 shown Figure 1 in, the atomic magnetic detector 200 includes a detection assembly, and the detection assembly includes a beam splitting member 210, a polarization device 220, a detection chamber 230, a photodetector 240, a modulation coil 250, a magnetic compensation coil 260, and a housing (not shown), and the housing accommodates the beam splitting member 210, the polarization device 220, the detection chamber 230, the photodetector 240, the modulation coil 250, and the magnetic compensation coil 260. In order to avoid confusing the important aspects of the present invention, components that are the same as or similar to those of the atomic magnetic detector 100 according to the first embodiment will not be described in detail again.

[0057] Different from the atomic magnetic detector 100 shown Figure 1 in, the atomic magnetic detector 200 has four detection chambers 230 arranged on the same plane, and the four detection chambers 230 are arranged axially symmetrically with respect to the beam splitting member 210, where two detection chambers 230 are adjacent to each other, and the other two detection chambers 230 are adjacent to each other.

[0058] In this embodiment, the housing of the atomic magnetic detector 200 includes multiple detection chambers 230, effectively realizing multi-channel magnetic field strength or magnetic gradient detection. Since the multiple detection chambers 230 are arranged axially symmetrically with respect to the same beam splitting member 210 and receive the beam splitting from the beam splitting member 210, the detection density is significantly improved, and the relative positions of the multiple detection chambers 230 within the same atomic magnetic detector 200 are fixed and stable. In addition, the design of this axially symmetric arrangement is simple, and the assembly and manufacturing costs are low.

[0059] Similar to the atomic magnetic detector 100 in the first embodiment, the atomic magnetic detector 200 according to this embodiment further includes a laser light source (not shown) and a collimating device (not shown). The laser light source generates a polarized light beam, and the light source interface 211 is used to receive the polarized light beam collimated by the collimating device and transmit it to the beam splitting member 210. The beam splitting member 210 then splits the received polarized light beam into four light beams and distributes them to two detection gas chambers 230 that are axially symmetric with each other, such that each detection gas chamber 230 receives a polarized light beam.

[0060] In another example, the beam splitting member 210 can also split the polarized light beam emitted by the laser light source into two wide light beams and distribute the two wide light beams to both sides respectively, so that each polarized light beam is simultaneously distributed to two detection gas chambers 230 located on the same side.

[0061] In yet another example, the atomic magnetic detector 200 can also include two laser light sources and generate two polarized light beams. Each of the two polarized light beams is distributed by the beam splitting member 210 to two detection gas chambers 230 that are axially symmetric with each other, such that each detection gas chamber 230 receives a polarized light beam.

[0062] The four detection gas chambers 230 arranged axially symmetrically with respect to the beam splitting member 210 all or partially receive the light of the same polarized light beam from the same laser light source. Therefore, the number and cost of the laser light sources are reduced, the volume occupied by the atomic magnetic detector 200 is reduced, making it have a higher detection density, and the noise difference between multiple light sources in the case of using respective laser light sources is eliminated or reduced, improving the noise reduction efficiency. Preferably, in the above example of using one laser light source, the four detection gas chambers 230 arranged axially symmetrically with respect to the beam splitting member 210 all receive the light of the same polarized light beam from the same laser light source, and the number and cost of the laser light sources, the volume occupied by the atomic magnetic detector 200 are further reduced and the noise reduction efficiency is further improved.

[0063] As Figure 2 shown, the beam splitting member 210 can be a prism having two 45° inclined planes. Each inclined plane faces two adjacent detection gas chambers 230, such that the beam splitting member 210 reflects the received polarized light beam propagating in the vertical direction into multiple polarized light beams propagating in the horizontal direction perpendicular to the vertical direction and distributes each polarized light beam to the corresponding detection gas chamber 230.

[0064] The detection gas chamber 230 contains an alkali metal gas. There are four photodetectors 240, and each photodetector 240 is arranged on the optical path after each detection gas chamber 230 and is also axially symmetric with respect to the beam splitting member 210. There are four polarization devices 220, and each polarization device 220 is arranged on the optical path between the light source assembly and the detection gas chamber 230 for converting the polarized light beam to be guided to the detection gas chamber 230 into a circularly polarized light beam.

[0065] In another example, two adjacent detection gas chambers 230 on the same side can share one polarization device 220.

[0066] In this embodiment, the four detection gas chambers 230 share a set of modulation coils 250. Therefore, the usage cost of the coils can be reduced, and the crosstalk between multiple modulation coils 250 generated when each detection gas chamber 230 uses a separate modulation coil 250 can also be eliminated, enabling the detection gas chambers 230 in the atomic magnetic detector 200 to be closer to each other. Compared with the traditional single-channel atomic magnetic detector, the detection density of the atomic magnetic detector 200 according to this embodiment is high and the occupied volume is small.

[0067] It should be noted that those skilled in the art should understand that the number of detection gas chambers 230 is not limited to 4, and it can also be other numbers, such as 2, 6, etc., as long as they are arranged axially symmetrically with respect to the light source assembly.

[0068] In another embodiment, one detection gas chamber 230 can also be arranged at the position of two adjacent detection gas chambers 230 in the second embodiment. That is to say, in this another embodiment, the two detection gas chambers 230 are arranged axially symmetrically with respect to the light source assembly. In this another embodiment, the atomic magnetic detector includes a light source that generates a polarized light beam, and the beam splitting member distributes the polarized light beam to each detection gas chamber respectively, so that each detection gas chamber receives a wide polarized light beam, which is transmitted through the corresponding detection gas chamber 230 to two photodetectors located behind the detection gas chamber 230. Therefore, each detection gas chamber can achieve detection at two points, further improving the detection density.

[0069] In another embodiment, the atomic magnetic detector may further include another detection component in a different plane from the detection component in the atomic magnetic detector 100 or the detection component in the atomic magnetic detector 200 as described above.

[0070] The atomic magnetic detector according to the third embodiment of the present invention will be described below. This atomic magnetic detector is similar to the atomic magnetic detector 100. The difference between the two is that in addition to a detection component including a beam splitter 110, a polarization device 120, a detection chamber 130, a photodetector 140, a modulation coil 150, and a magnetic field compensation coil 160, the atomic magnetic detector further includes another detection component on another plane parallel to and offset from this detection component. This other detection component also includes a beam splitter, a polarization device, a photodetector, a modulation coil, a compensation coil, and four detection chambers symmetrically arranged with respect to the center of the light source assembly. Therefore, the detection density of the atomic magnetic detector is further improved. The four detection chambers may be arranged in alignment with the four detection chambers 130 respectively, but the present invention is not limited thereto. It should be understood that the number of detection components is not limited to two and may be more, and each detection component does not necessarily need to be arranged identically.

[0071] In this embodiment, the detection chambers in each detection component share the same laser light source. Therefore, the number and cost of the laser light sources used are further reduced, and the volume occupied by the atomic magnetic detector is reduced, making it have a higher detection density.

[0072] In addition, each of the two detection components has a beam splitter 110. The two beam splitters 110 incident the same polarized light beam from the same light source into each detection chamber in each group of detection components. Among them, the beam splitter 110 of the detection component in the front of the optical path may have the property of being semi-transmissive and semi-reflective. It reflects a part of the received polarized light beam to each detection chamber of this detection component, and at the same time allows the other part of the received polarized light beam to transmit to another beam splitter 110.

[0073] The two detection components also each have a set of modulation coils. The two sets of modulation coils are offset by a certain distance to avoid crosstalk.

[0074] In yet another embodiment, the atomic magnetic detector may further include another detection component in the same plane as the detection component in the atomic magnetic detector 100 or the detection component in the atomic magnetic detector 200 described above and parallel to this plane and offset from each other.

[0075] The atomic magnetic detector according to the fourth embodiment of the present invention will be described below. This atomic magnetic detector is similar to the atomic magnetic detector 100. The difference between the two is that in addition to a detection component including a beam splitter 110, a polarization device 120, a detection chamber 130, a photodetector 140, a modulation coil 150, and a magnetic field compensation coil 160, the atomic magnetic detector further includes another detection component in the same plane as this detection component and parallel to this plane and offset from each other. The two detection components may be the same or different.

[0076] In this embodiment, each detection component shares the same laser light source. That is to say, the beam splitting components of the two detection components distribute the common polarized light beam from the common light source to each detection chamber. Specifically, the polarized light beam generated by the laser light source is split, and the generated light beam is incident on the beam splitting component in each group of detection components, and then is distributed to each detection chamber in each group of detection components through the beam splitting component. Therefore, the number of laser light sources used and the cost are further reduced, and the volume occupied by the atomic magnetic detector is reduced, so that it has a higher detection density.

[0077] In other examples, the above two groups of detection components may respectively use separate laser light sources.

[0078] The scope of the present disclosure is not limited by the embodiments described above, but is limited by the appended claims and their equivalents.

Claims

1. A multi-channel atomic magnetic detector (100, 200), characterized in that, Comprising: At least one detection component, each detection component comprising: A plurality of detection gas chambers (130, 230) on the same plane; and A beam splitting member (110, 210) for distributing a polarized light beam from a light source to the plurality of detection gas chambers; and Modulation coils (150, 250), where the plurality of detection gas chambers of each detection component share the same set of modulation coils, wherein, the plurality of detection gas chambers of each group of detection gas chambers are arranged centrosymmetrically or axially symmetrically with respect to the center of the beam splitting member, wherein, the multi-channel atomic magnetic detector further comprises a housing for accommodating the at least one detection component.

2. The multi-channel atomic magnetic detector according to claim 1, characterized in that, Further comprising: The beam splitting member is used to distribute a polarized light beam from the same light source to each detection gas chamber in the detection component.

3. The multi-channel atomic magnetic detector according to claim 1, characterized in that, At least a part of the plurality of detection gas chambers receive two polarized light beams or a widened polarized light beam.

4. The multi-channel atomic magnetic detector according to claim 1, characterized in that, The light source is accommodated in the housing.

5. The multi-channel atomic magnetic detector according to claim 1, characterized in that, The light source is arranged outside the housing.

6. The multi-channel atomic magnetic detector according to claim 1, characterized in that, Each detection component comprises: A plurality of photoelectric sensors (140, 240) for detecting information of the polarized light beam passing through the corresponding detection gas chamber, which are arranged on the optical path after the corresponding detection gas chamber and are also centrosymmetric or axially symmetric with respect to the beam splitting member.

7. The multi-channel atomic magnetic detector according to claim 1, characterized in that, Each detection component comprises: A plurality of polarization devices (120, 220) for converting a polarized light beam into a circularly polarized light beam, which are arranged on the optical path between the beam splitting member and the corresponding detection gas chamber and are also centrosymmetric or axially symmetric with respect to the beam splitting member.

8. The multi-channel atomic magnetic detector according to claim 1, characterized in that, The atomic magnetic detector comprises two or more detection components, and the two or more detection components are respectively arranged on planes parallel to each other and offset from each other.

9. The multi-channel atomic magnetic detector according to claim 1, characterized in that, The atomic magnetic detector comprises two or more detection components, and the two or more detection components are arranged on the same plane and offset from each other parallel to the plane.

10. The multi-channel atomic magnetic detector according to claim 8 or 9, characterized in that, The beam splitting members of the two or more detection components distribute a common polarized light beam from a common light source to each detection gas chamber.

11. The multi-channel atomic magnetic detector according to claim 1, characterized in that, Each detection component comprises four detection gas chambers (130), which are evenly spaced and centrosymmetrically arranged with respect to the beam splitting member on the same plane.

12. The multi-channel atomic magnetic detector according to claim 1, characterized in that, Each detection component comprises two detection gas chambers (230), which are axially symmetrically arranged with respect to the beam splitting member on the same plane.

13. The multi-channel atomic magnetic detector according to claim 1, wherein, Each detection component comprises four detection gas chambers (230), which are axially symmetrically arranged on both sides of the beam splitting member on the same plane, wherein, the two detection gas chambers on one side are adjacent to each other, and the two detection gas chambers on the other side are adjacent to each other.

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