CN114062983A - Atomic magnetic sensor for magneto-optical double-resonance magnetometer - Google Patents
Atomic magnetic sensor for magneto-optical double-resonance magnetometer Download PDFInfo
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- G01R33/032—Measuring direction or magnitude of magnetic fields or magnetic flux using magneto-optic devices, e.g. Faraday or Cotton-Mouton effect
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses an atomic magnetic sensor for magneto-optical double resonance magnetometer, which comprises: the device comprises a polarization wave plate, an electric control polarization adjusting assembly, an atomic gas chamber, a first alternating magnetic field coil, a second alternating magnetic field coil and a photoelectric detector; the polarization wave plate enables the laser beam to be linearly polarized; the electric control polarization adjusting assembly is used for adjusting the polarization direction of linearly polarized light; the atomic gas cell is in a total alternating magnetic field generated by the first alternating magnetic field coil and the second alternating magnetic field coil; the polarization direction of the linearly polarized light is kept parallel to the direction of the total alternating magnetic field and is kept perpendicular to the direction of the magnetic field to be measured by controlling the electric control polarization adjusting assembly, the first alternating magnetic field coil and the second alternating magnetic field coil, so that the direction error and the measuring blind area of the magneto-optical double-resonance magnetometer are eliminated.
Description
Technical Field
The invention relates to an atomic magnetic sensor, in particular to a magneto-optical dual-resonance magnetometer capable of eliminating the problems of direction errors and measurement blind areas caused by the direction change of a magnetic sensor relative to a magnetic field to be measured.
Background
The magnetometer is a general name for an instrument for measuring the magnitude of an external magnetic field, and the magnetometer with high detection sensitivity is widely used in the fields of biomedicine, geophysical, military, national defense and the like. The optical pump atomic magnetometer is one of the most developed high-sensitivity magnetometers at present, wherein laser is used as a light source of the magnetometer due to the advantages of good monochromaticity, excellent selection characteristics and the like, so that the performance index of a magnetometer system can be greatly improved, and the optical pump atomic magnetometer becomes a research hotspot at home and abroad.
The basic principle of the optical pump atomic magnetometer for realizing magnetic field measurement is as follows: under an external magnetic field with a certain size, the energy level of atoms can be split into a series of magnetic energy levels distributed equidistantly, and the frequency interval between adjacent magnetic energy levels is in direct proportion to the size of the external magnetic field. The traditional laser optical pump atomic magnetometer obtains magnetic resonance signals containing magnetic field information in different modes, and the signals are utilized to obtain the frequency interval between adjacent magnetic energy levels, so that the measurement of the external magnetic field is realized.
The optical pump atomic magnetometer system mainly comprises three modules, namely a laser light source module, an atomic magnetic sensor module and a magnetic resonance signal detection module. For different types of optical pump atomic magnetometers, the three modules respectively have different structures. The invention mainly aims at an optical pump atom magnetometer (hereinafter referred to as magneto-optical double resonance magnetometer) based on a magneto-optical double resonance mode, namely an optical pump atom magnetometer which applies an alternating magnetic field to induce a magnetic resonance signal and realizes a magnetic field measurement function by measuring the light intensity of laser after passing through an atom gas chamber.
The specific composition and functions of the internal three modules of the conventional magneto-optical dual-resonance magnetometer are briefly described as follows: 1) the laser light source module: the module mainly comprises a laser light source for generating laser for optical pumping and detection; 2) an atomic magnetic sensor module: the module mainly comprises a light beam collimation system (used for controlling the size and the divergence condition of a laser beam), an optical system (comprising a plurality of optical components and devices) used for controlling the polarization state of the laser, an atom air chamber (generally a glass bubble filled with certain atom gas), an alternating magnetic field coil (generating an alternating magnetic field) and a photoelectric detection element (used for detecting a laser light signal passing through the atom air chamber and converting the light signal into an electric signal for output), wherein the laser beam generated by the laser source module is expanded and collimated by the light beam collimation system, then passes through the optical polarization element and is converted into a light beam with a certain polarization state, such as circularly polarized light or linearly polarized light, the polarized light enters the atom air chamber again, interacts with atoms in the atom air chamber and the alternating magnetic field generated by the alternating magnetic field coil and then is transmitted out of the atom air chamber, the photoelectric detection element arranged behind the atomic gas chamber is used for detecting, converting the optical signal into an electric signal and outputting the electric signal to the magnetic resonance signal detection module; 3) a magnetic resonance signal detection module: the atomic magnetic sensor module is used for inputting the converted magnetic resonance electric signal containing the magnetic field signal to be detected into the magnetic resonance signal processing module, and realizes the extraction of the magnetic resonance signal by utilizing the signal processing functions of filtering, amplifying, phase locking, phase discrimination and the like in the atomic magnetic sensor module, the signal generating module generates a frequency modulation signal with adjustable carrier frequency and inputs the frequency modulation signal into the alternating magnetic field coil to generate a frequency-modulated alternating magnetic field, and the signal control module extracts the magnetic resonance signal through the extracted magnetic resonance signal, and controlling and locking the frequency and amplitude of the output modulation signal by using an internal feedback control system, and converting the locked frequency value into a magnetic field value for display and output.
The optical pump atomic magnetometer realizes magnetic field measurement, and needs to ensure that the magnetometer can meet a certain included angle relation with an external magnetic field, and the magneto-optical dual-resonance magnetometer also meets the requirement. If the included angle relation is not satisfied, on the one hand, the amplitude of the magnetic resonance signal is reduced, and under certain conditions, even the magnetic resonance signal cannot be detected (namely, a blind detection zone), the system cannot work normally. In addition, even if the external magnetic field is not changed, the change of the angle changes the detection result (i.e., the direction error) of the magnetic field. Therefore, the problems of direction errors and measurement blind areas caused by the direction change of the magnetic sensor relative to the magnetic field to be measured are reduced, and the method has important significance for improving the detection performance index of the magneto-optical double-resonance magnetometer under the motion platform.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide an atomic magnetic sensor for a magneto-optical dual-resonance magnetometer, in which an electrically controlled polarization adjustment component is added in an atomic magnetic sensor module of a conventional magneto-optical dual-resonance magnetometer, a pair of alternating magnetic field coils is additionally added in an orthogonal direction of an original alternating magnetic field coil, a voltage amplitude loaded on the electrically controlled polarization adjustment component is adjusted in real time to control a polarization direction of a line polarized laser, and amplitudes of frequency modulation signals on the two pairs of alternating magnetic field coils are adjusted to change a direction of a total alternating magnetic field (i.e., a resultant alternating magnetic field generated by the two pairs of alternating magnetic field coils), so that the direction of the total alternating magnetic field is always parallel to a polarization direction of light and always perpendicular to a direction of an external magnetic field, thereby eliminating direction errors and measurement blind zones of the magneto-optical dual-resonance magnetometer. After the direction of the total alternating magnetic field is parallel to the polarization direction of light, the included angle between the total alternating magnetic field and the external magnetic field is called a direction angle.
The technical scheme adopted by the invention is as follows:
an atomic magnetic sensor for a magneto-optical dual resonance magnetometer, comprising: the device comprises a polarization wave plate, an electric control polarization adjusting assembly, an atomic gas chamber, a first alternating magnetic field coil, a second alternating magnetic field coil and a photoelectric detector; the polarization wave plate enables the laser beam to be linearly polarized; the atomic gas cell is in a total alternating magnetic field generated by the first alternating magnetic field coil and the second alternating magnetic field coil; the polarization direction of the linearly polarized light is adjusted by controlling the electric control polarization adjusting assembly; adjusting a direction of the total alternating magnetic field by controlling the first alternating magnetic field coil and the second alternating magnetic field coil.
In one embodiment, the polarization direction of the linearly polarized light and the direction of the total alternating magnetic field are kept parallel and perpendicular to the direction of an external magnetic field by controlling the electric control polarization adjusting assembly, the first alternating magnetic field coil and the second alternating magnetic field coil.
In one embodiment, the first alternating magnetic field coil and the second alternating magnetic field coil are two pairs of coils orthogonal to each other.
In one embodiment, the polarization direction of the linearly polarized light is adjusted by controlling the amplitude of the voltage loaded on the electrically controlled polarization adjusting assembly.
In one embodiment, the direction and the amplitude of the total alternating magnetic field are adjusted by controlling the amplitude of the frequency modulation signal applied to the first alternating magnetic field coil and the second alternating magnetic field coil.
In one embodiment, the frequency modulation signals loaded on the first alternating magnetic field coil and the second alternating magnetic field coil have the same frequency and phase, and the amplitude is independently adjustable.
In one embodiment, the frequency modulation signal includes a carrier signal and a modulation signal, and the carrier signal is adjustable in frequency.
In one embodiment, the laser beam sequentially passes through the polarization wave plate, the electric control polarization adjusting assembly and the atomic gas chamber and finally enters the photoelectric detector; the photoelectric detector converts the optical signal into an electric signal and outputs the electric signal to the magnetic resonance signal detection module; the magnetic resonance signal detection module processes the electric signal to obtain an error signal; and controlling the electronically controlled polarization adjustment assembly, the first alternating magnetic field coil and the second alternating magnetic field coil with the error signal.
In a certain embodiment, the error signal is a component value obtained by phase-discriminating the electric signal output by the photodetector and the carrier signal of the frequency modulation signal loaded on the first alternating magnetic field coil and the second alternating magnetic field coil.
In one embodiment, the atomic magnetic sensor further includes: a beam collimation system, a light intensity attenuator and a prism; the laser beam sequentially passes through the beam collimation system, the polarization wave plate, the light intensity attenuator, the electric control polarization adjusting assembly, the atomic gas chamber and the prism and finally enters the photoelectric detector.
The invention has the following beneficial effects:
for a traditional magneto-optical double-resonance magnetometer, due to the existence of direction errors and measurement blind areas, the direction change of an external magnetic field can bring adverse effects on the detection performance of the magnetometer. The invention realizes the real-time control of the linear polarization direction and the total alternating magnetic field direction of the laser by utilizing the added electric control polarization adjusting assembly and two pairs of alternating magnetic field coils, so that the linear polarization direction and the total alternating magnetic field direction can be always parallel to and perpendicular to the external magnetic field, thereby eliminating the direction error and the measurement blind area generated by the change of the external magnetic field direction to the instrument and improving the detection performance index of the magneto-optical double-resonance magnetometer under the moving platform.
Drawings
Fig. 1 is a schematic structural diagram of an atomic magnetic sensor for a magneto-optical dual-resonance magnetometer according to the invention.
Fig. 2 is a graph showing an experimental result of a relationship between an amplitude of an error signal and a direction angle (an included angle between a common direction of laser polarization and a total alternating magnetic field and an external magnetic field) for a control system in an embodiment of the present invention.
Description of reference numerals: the system comprises a light beam collimation system, a polarization wave plate 2, a light intensity attenuator 3, an electronic control polarization adjusting assembly 4, an atomic gas chamber 5, a first alternating magnetic field coil 6, a second alternating magnetic field coil 7, a prism 8 and a photoelectric detector 9.
Detailed Description
The present invention is described in further detail below with reference to the attached drawings, and it should be noted that the following detailed description is only for illustrative purposes and is not to be construed as limiting the scope of the present invention, and those skilled in the art can make modifications and variations of the present invention without departing from the spirit and scope of the present invention.
As shown in fig. 1, the atomic magnetic sensor for magneto-optical dual resonance magnetometer of the present invention comprises: the device comprises a light beam collimation system 1, a polarization wave plate 2, a light intensity attenuator 3, an electronic control polarization adjusting assembly 4, an atom air chamber 5, a first alternating magnetic field coil 6, a second alternating magnetic field coil 7, a prism 8 and a photoelectric detector 9.
The laser beam emitted from the light source module first passes through the beam collimating system 1 to collimate and expand the laser beam. The collimated laser beam is changed into linearly polarized light through the polarized wave plate 2, and the polarized wave plate is rotated, so that the intensity of the transmitted laser beam is maximum. The intensity of the linearly polarized laser light is adjusted by the light intensity attenuator 3. After passing through the light intensity attenuator 3, linearly polarized light passes through the electric control polarization adjusting component 4, the electric control polarization adjusting component 4 can be an electric control liquid crystal polarization rotator, and the adjustment of the linear polarization direction of laser beams entering the liquid crystal polarization rotator is realized by changing the amplitude of a voltage signal loaded on liquid crystal. Linearly polarized light passing through the electric control polarization adjusting assembly 4 is incident along the axial direction of the atom air chamber 5, the atom air chamber 5 is positioned in a total alternating magnetic field generated by a first alternating magnetic field coil 6 and a second alternating magnetic field coil 7, the direction of the alternating magnetic field generated by the first alternating magnetic field coil 6 is vertical to the paper surface, the direction of the alternating magnetic field generated by the second alternating magnetic field coil 7 is parallel to the paper surface and vertical to the propagation direction of the laser beam, the frequency modulation signals applied to the first alternating magnetic field coil 6 and the second alternating magnetic field coil 7 have the same frequency and phase, and the amplitude can be controlled independently, the frequency modulation signals comprise modulation signals and carrier signals, the frequency of the carrier signals can be adjusted, the rotation of the total alternating magnetic field direction is achieved by controlling the amplitude of the frequency modulated signal applied to the first alternating magnetic field coil 6 and the second alternating magnetic field coil 7. The linearly polarized light after passing through the atomic gas cell 5 is incident to the prism 8 for focusing and then is incident to the photodetector 9. The photoelectric detector 9 converts the optical signal into an electrical signal, outputs the measured electrical signal to the magnetic resonance signal detection module through a wire, is used for acquiring and processing the magnetic resonance signal, and simultaneously controls the carrier frequency of the frequency modulation signal loaded on the first alternating magnetic field coil 6 and the second alternating magnetic field coil 7, the signal amplitude of the frequency modulation signal loaded on the first alternating magnetic field coil 6 and the second alternating magnetic field coil 7, and the voltage signal amplitude on the electronic control polarization adjustment component 4.
In a certain embodiment, the error signal processed by the magnetic resonance signal detection module is a component value obtained by phase-discriminating the electrical signal output by the photodetector 9 and the carrier signal of the frequency modulation signal.
In one embodiment, the error signal is used to achieve simultaneous control of the polarization direction of the light and the total alternating magnetic field direction.
In one embodiment, the total alternating magnetic field direction is always parallel to the polarization direction of the light. Keeping the total alternating magnetic field direction parallel to the linearly polarized light polarization direction using the following method: in an initial state, the direction of a total alternating magnetic field is parallel to the polarization direction of linearly polarized light and is along the direction vertical to the paper surface, in order to realize rotation of a certain angle, a voltage amplitude corresponding to the angle is searched according to a lookup table, a corresponding voltage amplitude is output and loaded on the electric control polarization adjusting assembly 4, meanwhile, the amplitude of the total alternating magnetic field is multiplied by a cosine value of the angle to be used as the amplitude of the alternating magnetic field of the first alternating magnetic field coil 6, the amplitude of the total alternating magnetic field is multiplied by a sine value of the angle to be used as the amplitude of the alternating magnetic field of the second alternating magnetic field coil 7, so that the direction of the total alternating magnetic field is always parallel to the polarization direction of the linearly polarized light, and at the moment, an included angle between the common direction of the total alternating magnetic field and the polarization of the linearly polarized light and an external magnetic field is called as a direction angle.
In a certain embodiment, the electrically controlled polarization adjustment assembly 4 needs to be loaded with a voltage signal, the voltage signal is from a signal generation module inside the magnetic resonance signal detection module, and the amplitude of the voltage signal can be controlled by the signal control module.
In one embodiment, the following method is used to maintain the direction angle at 90 degrees: the electrical signal output by the photodetector 9 is processed by the magnetic resonance signal detection module, and the generated error signal exhibits a dispersion line type near a direction angle of 90 degrees, as shown in fig. 2, and the direction angle can be locked to 90 degrees by using a feedback control system, such as a classical proportional-integral-derivative controller.
Helium for magneto-optical dual resonance magnetometer4He) atomic magnetic sensor as a specific embodiment, illustrating the working process and principle of the invention:
1. the specific devices selected are as follows
The beam collimation system 1 realizes collimation and beam expansion of laser beams. The polarization wave plate 2 is a polarization wave plate with a central wavelength of 1083 nm. The light intensity attenuator 3 is a light intensity attenuator with a center wavelength of 1083 nm. The electric control polarization adjusting component 4 is an electric control liquid crystal polarization rotator, and the central wavelength is 1083 nm. The atomic gas chamber 5 is a cylindrical glass bubble with a bottom surface diameter of 50mm and a height of 70mm, and is internally filled with helium (4He) atomic gas at a pressure of 0.4 Torr. The direction of the alternating magnetic field generated by the first alternating magnetic field coil 6 is perpendicular to the paper surface, and the direction of the alternating magnetic field generated by the second alternating magnetic field coil 7 is parallel to the paper surface and perpendicular to the propagation direction of the laser beam. The prism 8 is a prism having a center wavelength of 1083 nm. The photodetector 9 is an InGaAs photocell capable of responding to a light signal of 1083nm central wavelength.
2. Working process and principle
The laser beam emitted from the light source module first passes through the beam collimating system 1 to collimate and expand the laser beam. The collimated laser beam is changed into linearly polarized light through the polarization wave plate 2, and the polarization wave plate 2 is rotated, so that the intensity of the transmitted laser beam is maximum. The intensity of the linearly polarized laser light is adjusted by the light intensity attenuator 3. After passing through the light intensity attenuator 3, linearly polarized light passes through the electric control polarization adjusting component 4, the electric control polarization adjusting component 4 can be an electric control liquid crystal polarization rotator, and the adjustment of the linear polarization direction of laser beams entering the liquid crystal polarization rotator is realized by changing the amplitude of alternating voltage signals loaded on liquid crystal. Linearly polarized light passing through the electric control polarization adjusting assembly 4 is incident along the axial direction of the atom air chamber 5, the atom air chamber 5 is positioned in a total alternating magnetic field generated by a first alternating magnetic field coil 6 and a second alternating magnetic field coil 7, the direction of the alternating magnetic field generated by the first alternating magnetic field coil 6 is vertical to the paper surface, the direction of the alternating magnetic field generated by the second alternating magnetic field coil 7 is parallel to the paper surface and vertical to the propagation direction of the laser beam, the frequency and the phase of the frequency modulation signals applied by the first alternating magnetic field coil 6 and the second alternating magnetic field coil 7 are equal, the amplitude can be controlled independently, the frequency modulation signals comprise modulation signals and carrier signals, the frequency of the carrier signals is adjustable, the frequency of the modulation signals is fixed to be about 1kHz, the rotation of the total alternating magnetic field direction is achieved by controlling the amplitude of the frequency modulated signal applied to the first alternating magnetic field coil 6 and the second alternating magnetic field coil 7. The linearly polarized light after passing through the atomic gas cell 5 is incident to the prism 8 for focusing and then is incident to the photodetector 9. The photoelectric detector 9 converts the optical signal into an electrical signal, outputs the measured electrical signal to the magnetic resonance signal detection module through a wire, is used for acquiring and processing the magnetic resonance signal, and simultaneously controls the carrier frequency of the frequency modulation signal loaded on the first alternating magnetic field coil 6 and the second alternating magnetic field coil 7, the signal amplitude of the frequency modulation signal loaded on the first alternating magnetic field coil 6 and the second alternating magnetic field coil 7, and the voltage signal amplitude on the electronic control polarization adjustment component 4.
Fig. 2 is a graph showing the experimental results of the relationship between the amplitude of the error signal for controlling the laser linear polarization direction and the total alternating magnetic field direction and the direction angle (the included angle between the common direction of the laser polarization and the total alternating magnetic field and the external magnetic field).
The basic logic for realizing the control of the polarization direction of the laser line by using the system of the invention is as follows:
1) the amplitude of the voltage loaded on the electric control polarization adjusting component 4 can change the linear polarization direction of the laser;
2) the direction and amplitude of the total alternating magnetic field can be changed by changing the signal amplitude of the frequency modulation signals loaded on the first alternating magnetic field coil 6 and the second alternating magnetic field coil 7;
3) keeping the total alternating magnetic field direction parallel to the linearly polarized light polarization direction using the following method: in an initial state, the direction of a total alternating magnetic field is parallel to the polarization direction of linearly polarized light and is along the direction vertical to the paper surface, in order to realize rotation of a certain angle, a voltage amplitude corresponding to the angle is searched according to a lookup table, a corresponding voltage amplitude is output and loaded on the electric control polarization adjusting assembly 4, meanwhile, the amplitude of the total alternating magnetic field is multiplied by a cosine value of the angle to be used as the amplitude of the alternating magnetic field of the first alternating magnetic field coil 6, the amplitude of the total alternating magnetic field is multiplied by a sine value of the angle to be used as the amplitude of the alternating magnetic field of the second alternating magnetic field coil 7, so that the direction of the total alternating magnetic field is always parallel to the polarization direction of the linearly polarized light, and an included angle between the common direction of the total alternating magnetic field and the polarization of the linearly polarized light and an external magnetic field is called as a direction angle;
4) the magnitude of the error signal in fig. 2 is related to the direction angle, wherein the magnitude of the error signal is 0 when the direction angle is 90 degrees, while the magnitudes of the error signal are opposite in sign when the direction angle is on both sides of 90 degrees; although there are other direction angles corresponding to the error signal amplitude of 0, the amplitude of the magnetic resonance signal is the largest only when the direction angle is 90 degrees, a threshold value can be set according to the amplitude of the magnetic resonance signal around 90 degrees, and when the magnetic resonance signal is greater than the threshold value, the direction angle is judged to fall into a locking area, so that the direction angle is locked;
5) therefore, the electronically controlled polarization adjustment assembly 4, the first alternating magnetic field coil 6, and the second alternating magnetic field coil 7 are feedback-controlled with the error signal, so that the direction angle is changed until the value is 90 degrees, at which time the amplitude of the error signal is 0.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. An atomic magnetic sensor for a magneto-optical dual resonance magnetometer, comprising: the device comprises a polarization wave plate, an electric control polarization adjusting assembly, an atomic gas chamber, a first alternating magnetic field coil, a second alternating magnetic field coil and a photoelectric detector; the polarization wave plate enables the laser beam to be linearly polarized; the atomic gas cell is in a total alternating magnetic field generated by the first alternating magnetic field coil and the second alternating magnetic field coil; the polarization direction of the linearly polarized light is adjusted by controlling the electric control polarization adjusting assembly; adjusting a direction of the total alternating magnetic field by controlling the first alternating magnetic field coil and the second alternating magnetic field coil.
2. An atomic magnetic sensor for a magneto-optical dual resonance magnetometer according to claim 1, wherein the polarization direction of the linearly polarized light is kept parallel to the direction of the total alternating magnetic field and perpendicular to the direction of an external magnetic field by controlling the electrically controlled polarization adjustment assembly, the first alternating magnetic field coil and the second alternating magnetic field coil.
3. An atomic magnetic sensor for a magneto-optical dual resonance magnetometer according to claim 1 or 2, wherein the first alternating magnetic field coil and the second alternating magnetic field coil are two pairs of coils orthogonal to each other.
4. An atomic magnetic sensor for a magneto-optical dual resonance magnetometer according to claim 1 or 2, wherein the polarization direction of the linearly polarized light is adjusted by controlling the magnitude of the voltage applied to the electrically controlled polarization adjusting component.
5. An atomic magnetic sensor for a magneto-optical dual resonance magnetometer according to claim 1 or 2, wherein the direction and magnitude of the total alternating magnetic field are adjusted by controlling the magnitude of the frequency modulation signal loaded on the first alternating magnetic field coil and the second alternating magnetic field coil.
6. An atomic magnetic sensor for a magneto-optical dual resonance magnetometer according to claim 5, wherein the frequency modulation signals applied to the first alternating magnetic field coil and the second alternating magnetic field coil are equal in frequency and phase and individually adjustable in amplitude.
7. An atomic magnetic sensor for a magneto-optical dual resonance magnetometer according to claim 5, wherein the frequency modulation signal comprises a carrier signal and a modulation signal, the carrier signal being frequency tunable.
8. The atomic magnetic sensor for a magneto-optical dual-resonance magnetometer of claim 7, wherein the laser beam sequentially passes through the polarization wave plate, the electrically controlled polarization adjustment assembly, and the atomic gas chamber, and finally enters the photodetector; the photoelectric detector converts the optical signal into an electric signal and outputs the electric signal to the magnetic resonance signal detection module; the magnetic resonance signal detection module processes the electric signal to obtain an error signal; and controlling the electronically controlled polarization adjustment assembly, the first alternating magnetic field coil and the second alternating magnetic field coil with the error signal.
9. An atomic magnetic sensor for a magneto-optical dual resonance magnetometer according to claim 1, wherein the error signal is a component value obtained by phase-discriminating the electric signal output by the photodetector and the carrier signal of the frequency modulation signal loaded on the first alternating magnetic field coil and the second alternating magnetic field coil.
10. An atomic magnetic sensor for a magneto-optical dual resonance magnetometer according to claim 8, wherein the atomic magnetic sensor further comprises: a beam collimation system, a light intensity attenuator and a prism; the laser beam sequentially passes through the beam collimation system, the polarization wave plate, the light intensity attenuator, the electric control polarization adjusting assembly, the atomic gas chamber and the prism and finally enters the photoelectric detector.
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