101 results about "Atomic magnetometer" patented technology

According to the three-axis real-time magnetic field measurement method and device based on the elliptically polarized light SERF atom magnetometer, three-axis magnetic field information is coded through the asymmetrical coupling characteristic of elliptically polarized light, z-axis magnetic field signal components with different frequencies are synchronously demodulated based on a calculation module of an FPGA, and therefore effective superposition of z-axis magnetic field information is achieved; the method comprises the following steps of: 1, performing sideband demodulation on a differential amplification signal which takes elliptically polarized light as pumping light, acts on an atomic gas chamber, is converted by a polarization differential detection module and is output by utilizing an FPGA (Field Programmable Gate Array)-based calculation module in an elliptically polarized light SERF atom magnetometer system; respectively extracting a sum frequency signal component P + and a difference frequency signal component P-containing different z-axis magnetic field information; step 2, carrying out combined processing on P + and P-to generate a comprehensive data signal containing richer three-axis magnetic field information; and step 3, decoupling the signal into a magnetic field intensity component in an orthogonal direction, and forming a three-axis real-time magnetic field measurement result as a magnetometer signal output.

This invention provides a fast frequency closed-loop control method and system for an alkali metal atomic magnetometer laser, comprising: setting the laser current and laser temperature, calculating and obtaining the laser frequency closed-loop control signal SigX; and controlling the laser frequency based on the offset value of the frequency closed-loop control signal SigX and the correlation function f(I) = φ(I, SigX) between the current value and SigX. X The process involves calculating and obtaining the current adjustment value ΔI0, which is then directly applied to the laser current. The difference between the current adjustment value I1 and the set value I0 is calculated as ΔI1. Based on the correlation function f = φ(f(I), f(T)), the temperature change ΔT1 corresponding to the current change ΔI1 is calculated. This temperature adjustment ΔT1 is then applied to the laser temperature. By adjusting the laser temperature to T1, the laser current value is changed back from the adjustment value I1 to the initial set value I0. This invention addresses the problem in existing technologies where using laser current as a feedback signal for closed-loop control of laser frequency easily affects the laser's performance and consequently its lifespan.

The application provides an atomic magnetometer heading error dynamic compensation method and an atomic magnetometer. E ; step two, an alternating current magnetic field parallel to the driving light direction is actively applied to the atomic magnetometer; the response characteristics of the atomic magnetometer to the alternating current magnetic field are the same as the response characteristics of the atomic spin error magnetic field, that is, B=B0+B E ·cosθ+B AC ·cosθ; the frequency f of the magnetic field B f detected by the atomic magnetometer is used to realize atomic magnetometer heading error dynamic compensation, wherein B is the total magnetic field detected by the atomic magnetometer, B0 is the environmental magnetic field intensity in the geomagnetic environment, and θ is the included angle between the driving light and the environmental magnetic field. The technical scheme of the application is used to solve the technical problem that high sensitivity and low heading error are difficult to be considered together with the gradual reduction of the volume of the atomic magnetometer in the prior art.

The application discloses a method for improving low-frequency precision of an atomic magnetometer, and relates to the technical field of weak magnetic detection. In the method, the closed-loop atomic magnetometer is in a zero-locking state, a direct-current bias system is automatically and accurately adjusted, the atomic magnetometer is caused to work in a critical interval between a zero-locking region and a linear region, the zero-locking region has the suppression on low-frequency magnetic noise, and the linear region has a higher response to a measured magnetic field, so that the low-frequency measurement precision of the atomic magnetometer is improved. The application is suitable for an optical pumping atomic magnetometer system, and is favorable for improving the precision and stability of the atomic magnetometer, and can significantly improve the magnetic field sensitivity in the low-frequency part.

The invention discloses an atomic magnetometer longitudinal magnetic field interference resisting method and system based on zero offset point control, and the method comprises the steps: building a system response model containing a zero offset error, and respectively setting the zero offset points of first harmonic and second harmonic response signals as closed-loop control targets of x-axis and y-axis magnetic fields; and the output response of the double-loop closed-loop feedback control system is stabilized at a zero offset point, so that the interference of longitudinal magnetic field fluctuation on transverse magnetic field measurement is isolated in principle, and the real-time decoupling measurement of the transverse magnetic field to be measured is realized. The problem that quasi-static and dynamic longitudinal magnetic field interference cannot be suppressed at the same time in the prior art is solved, and the device has the advantages of being completely free of longitudinal magnetic field interference, biaxial decoupling measurement and long-term stable work.

A traceable multi-mode extremely weak magnetic field measuring device and method, comprising helium-3 atoms and an atomic magnetometer in a spin-exchange relaxation-free state, the helium-3 atoms polarized by metastable exchange optical pumping under an extremely weak magnetic field provide a traceable magnetic field value for the atomic magnetometer, the value is compared with the output response of the atomic magnetometer to obtain a calibrated scale factor of the atomic magnetometer, so that the measurement values of the atomic magnetometer are traceable. The atomic magnetometer meter head comprises four independent detection channels, the four detection channels are obtained by beam splitting of two detection lasers with different frequency detuning amounts, and the channels have high consistency. The method proposed by the application is compatible with the cooperative use of multiple probes, and can realize single-meter-head multi-channel measurement, meter-head internal magnetic field gradient measurement and meter-head inter-magnetic field gradient measurement three measurement modes, each mode has high consistency and high sensitivity.

The invention relates to an active magnetic compensation system and a control method, the active magnetic compensation system comprises a magnetic shielding cabin, an SERF atom magnetometer, a composite controller, a voltage-controlled current source and a biplane compensation coil, the SERF atom magnetometer is placed in the magnetic shielding cabin and is used for measuring an internal magnetic field to obtain an internal magnetic field signal; the composite controller is used for compensating the output delay of the SERF atom magnetometer according to the internal magnetic field signal and generating a control signal for compensating the magnetic field; the voltage-controlled current source is used for generating compensation current according to the control signal; the biplane compensation coil is used for generating a compensation magnetic field according to the compensation current. Through the composite controller, the output delay of the SERF atom magnetometer is compensated, so that the stability and the response speed of an active magnetic compensation system are improved, and a stable extremely-weak magnetic field environment in a magnetic shielding cabin is realized.

The present application relates to the technical field of geophysical exploration, in particular to a downhole three-component magnetic field sensing system based on atomic magnetometer. The downhole three-component atomic magnetic field sensor is connected with the optical fiber signal modem in the ground well logging vehicle through the armored photoelectric composite cable. The optical fiber signal modem is used for real-time demodulation of the three-component magnetic field signals and three-component attitude signals measured by the three-component atomic magnetic field sensor. The three-component atomic magnetic field sensor comprises a non-magnetic high-temperature packaging structure, a high-temperature-resistant atomic gas chamber module, a three-axis orthogonal laser optical system, a high-temperature-resistant photoelectric detection array, a power management module, a temperature sensor, a magnetic field solving and signal processing unit and a three-component optical fiber attitude sensor which are arranged in the non-magnetic high-temperature packaging structure. The three-component atomic magnetic field sensor adopts the atomic magnetometer measurement principle, combines the high-temperature-resistant materials and the optimized heat dissipation design, and can work stably in an environment of up to 200 DEG C.

The application relates to an inter-axis coupling suppression method and device, wherein the inter-axis coupling suppression method comprises the following steps: after a preset high-frequency modulation field is applied to a first measurement axis and a second measurement axis of an atomic magnetometer, a first excitation strategy and a second excitation strategy of the atomic magnetometer are independently executed respectively, and execution results of the excitation strategies are analyzed to obtain a first frequency response and a second frequency response; a coupling matrix is determined based on the first frequency response and the second frequency response; a decoupling filter matrix corresponding to the coupling matrix is determined and is converted into time-domain filter coefficients; when the atomic magnetometer performs actual double-axis measurement, a first actual measurement signal corresponding to the first measurement axis and a second actual measurement signal corresponding to the second measurement axis are acquired in real time, and the first actual measurement signal and the second actual measurement signal are decoupled based on the time-domain filter coefficients to obtain a first decoupled signal and a second decoupled signal. Through the application, the problem that the measurement accuracy of the magnetometer is low is solved.

The application discloses a kind of triaxial SERF atom magnetometer quadrature double frequency modulation system and method, the system utilizes signal generation module to generate frequency f m The sine quadrature modulation signal of cosine is respectively driven SERF atom magnetometer X and Y axis magnetic field generating coil, and 2nf m Frequency sine signal of driving Z axis coil, through the integral filter of 3 groups of integral period integration, the open-loop magnetic field signal of X axis, Y axis and Z axis magnetic field component is obtained, and through control module, the driving current of three-axis magnetic field coil is controlled to generate compensation magnetic field, so that the open-loop magnetic field signal of X axis, Y axis and Z axis magnetic field component is zero, at this time, the magnetic field intensity of atom chamber is zero, and the compensation current output by control module is the X, Y and Z axis magnetic field intensity signal measured by triaxial SERF atom magnetometer.The system can directly extract triaxial magnetic field calculation signal from a laser signal, and eliminate the cross-coupling effect when triaxial magnetic field is calculated, improve the measurement range and quadrature of SERF atom magnetometer, with very high engineering application value.

The present application relates to the technical field of atomic magnetometer, and particularly relates to a laser frequency stability control method of NMOR atomic magnetometer based on optical rotation signal, which comprises the following steps: irradiating an atomic cell with linearly polarized laser to pump atoms and detecting optical rotation signal; once demodulating the optical rotation signal to obtain magnetic resonance signal; applying a fixed frequency modulation signal to the laser frequency; twice demodulating the magnetic resonance signal to obtain a demodulation signal corresponding to the laser frequency offset; and feeding back and adjusting the laser frequency according to the demodulation signal. The present application is used to reduce the influence of laser frequency drift on the magnetic resonance signal of NMOR atomic magnetometer, improve the stability of long-term work of NMOR atomic magnetometer, and reduce the system volume and system complexity.

The application relates to the technical field of deep space exploration precise magnetic field measurement and sensors, and provides a closed-loop temperature compensation circuit and a temperature compensation method for an atomic magnetometer laser. The closed-loop temperature compensation circuit and the temperature compensation algorithm are provided, the shell temperature value of the laser unit is converted into a digital signal by an ADC unit and then transmitted to an FPGA controller unit, then the temperature compensation algorithm process is realized by the FPGA controller unit, the temperature compensation code value corresponding to the current shell temperature value is determined, the temperature compensation code value is added to the reference temperature point code value compensated by temperature to obtain a temperature correction code value, the temperature correction code value is transmitted to the laser unit through a second DAC unit and a TEC controller unit connected in series, and therefore the control parameters of the TEC controller can be dynamically adjusted under different temperature environments, the working parameters of the laser TEC are adjusted, and the output frequency stability of the laser is ensured.

The application provides an atomic magnetometer light power adjustment system and method based on line width scanning, and belongs to the field of precision measurement. The atomic magnetometer light power adjustment system comprises: a magnetic field generating coil configured to generate a scanning magnetic field linearly changing over time based on a preset waveform driving current; an atomic gas chamber configured to modulate detection light of an atomic magnetometer based on the scanning magnetic field to obtain a light modulation signal; a photodetector configured to convert the light modulation signal into an initial electric signal; a signal processing module configured to obtain an atomic spectral line width value based on the initial electric signal; and an adjustment module configured to adjust a light attenuator of the atomic magnetometer based on a preset light power-atomic spectral line width calibration relationship, a target light power value and the atomic spectral line width value, so as to update the light power value of the atomic magnetometer.

This invention discloses a cross-axis synchronous in-situ magnetic compensation method for a dual-beam SERF atomic magnetometer, belonging to the field of magnetic compensation technology. Based on the steady-state solution of the Bloch equation, a mathematical correlation is established between the light intensity signal and the triaxial magnetic field. First, the optimization target is determined according to the remanent magnetization direction of the sensitive axis. A three-part nested method is used to iteratively compensate the pump axis remanent magnetization, compensating the pump axis magnetic field to within the error range. Then, in the two-dimensional search space formed by the detection axis and the sensitive axis, the optimal compensation values ​​for the detection axis and the sensitive axis are simultaneously optimized through independent iteration and information interaction using a dual particle swarm optimization algorithm. Finally, the triaxial compensation current value is output to drive the compensation coil to generate a compensation magnetic field, completing rapid and high-precision automatic compensation of the triaxial remanent magnetization. This invention features a simple compensation process, fast convergence speed, and high compensation accuracy, adapting to the application requirements of miniaturized and integrated dual-beam SERF atomic magnetometers, and has significant application value in weak magnetic field detection fields such as biomagnetic imaging.

The invention relates to the technical field of data processing, and further relates to a data extraction method and system for digital geological mineral exploration. Comprising the following steps: step 1, performing analog-to-digital conversion on multiple paths of original magnetic field response voltage signals synchronously acquired by multiple optical pump atomic magnetometer sensing units to obtain multiple paths of original magnetic field response digital sequences; 2, performing phase gradient field iteration reconstruction processing on the magnetic field in-phase response matrix and the magnetic field orthogonal response matrix to obtain a reconstructed phase matrix and a magnetic field amplitude matrix; and 3, calculating a magnetic field amplitude deviation matrix and a phase deviation matrix according to the magnetic field amplitude matrix and the reconstructed phase matrix, converting the mineral anomaly candidate position into a geological space coordinate, and outputting geological mineral anomaly feature data.

The invention provides a single light source atom magnetometer with a low measurement dead zone and a magnetic field measurement method. The single light source atom magnetometer comprises a laser, an optical fiber splitter, a first collimator, a second collimator, an alkali metal atom gas chamber, an excitation magnetic field coil, a signal processor, a first photoelectric detector and a second photoelectric detector, according to the single-light-source atom magnetometer, the same light source is divided into two beams to detect the atom gas chamber at different angles, detection signals are obtained, the detection range of the atom magnetometer reaches 360 degrees, and the detection dead zone of the atom magnetometer is greatly reduced. By applying the technical scheme of the invention, the technical problem that the sensitivity is reduced or the measurement is failed when a magnetic field in a certain direction is measured due to the inherent measurement dead zone in the operation process of the traditional magnetometer is solved.

This invention relates to a miniaturized triaxial SERF atomic magnetometer device with dual-pump light semi-transparent and semi-reflective beams. A single pump light is guided into the probe by a polarization-maintaining fiber. Then, using a half-wave plate, a polarization beam splitter, a right-angle mirror, and a quarter-wave plate, the pump light is split into two circularly polarized pump lights of equal intensity, which then pass perpendicularly through the same alkali metal gas cell. The pump light passing through the gas cell is then split by a semi-transparent and semi-reflective planar beam splitter; half of the pump light is detected by a photodetector to extract magnetic field information, while the other half returns along the same path and passes through the alkali metal gas cell a second time. This invention achieves high-sensitivity simultaneous measurement of triaxial magnetic fields in a miniaturized triaxial SERF atomic magnetometer, enhances atomic spin polarizability, and improves the uniformity of atomic spin polarizability within the gas cell. It addresses the technical challenge of achieving uniform spin polarizability in miniaturized SERF atomic magnetometer applications, and is beneficial for applications of array-type triaxial SERF atomic magnetometers in fields such as magnetocardiography and magnetoencephalography.

The utility model discloses a miniaturized single-beam reflection-type atom magnetometer probe and an atom magnetometer. The atom magnetometer probe comprises a housing; an alkali metal atom gas cell; the combined prism is arranged on one side of the alkali metal atom gas chamber; the reflecting mirror is arranged on the other side of the alkali metal atom gas chamber; the photoelectric detector is arranged on one side, deviating from the alkali metal atom gas chamber, of the combined prism; the combined prism is used for converting collimated light received by the incident plane into circularly polarized light, the circularly polarized light is emitted to the alkali metal atom gas chamber through the emergent plane, and the reflector is used for reflecting pumping light passing through the alkali metal atom gas chamber back to the alkali metal atom gas chamber. The absorption optical path of the pumping light is remarkably improved, secondary polarization is achieved, meanwhile, the action intensity of the pumping light and alkali metal atoms is improved, the number of atoms is equivalently increased in a limited area, higher sensitivity can be achieved at a lower temperature, the performance of the single-beam atom magnetometer is remarkably improved, and miniaturization design is facilitated.

The application relates to the technical field of magnetic field measurement, in particular to a double-frequency resonance locking system of an NMOR atomic magnetometer based on FPGA, which comprises an FPGA, a laser modulation driving unit and a signal acquisition and processing unit, a homologous synchronous reference signal source, a first demodulation branch and a second demodulation branch are arranged in the FPGA, signals corresponding to a single Larmor frequency and double Larmor frequency are synchronously demodulated respectively to obtain corresponding in-phase signals and quadrature signals. The FPGA determines corresponding weight coefficients according to the output signals of the two demodulation branches, fuses corresponding frequency correction amounts and obtains a frequency control amount to adjust the laser modulation frequency. The system is also provided with a frequency sweeping and peak searching logic and a host computer parameter configuration module. The application is used for realizing that there is always a feedback signal with sufficient signal-to-noise ratio in the whole space range, so that the measurement blind area of the single-frequency NMOR magnetometer is eliminated.

A single-light-path atom magnetometer based on any polarization state light splitting metasurface cascade is characterized in that coherent light emitted by a laser passes through a first-stage metasurface to realize light beam splitting in an orthogonal elliptical polarization state, one beam of light in the beam splitting light enters a glass gas chamber for pumping and detection, and the other beam of light enters a photoelectric detector for pumping and detection; the second-stage metasurface is used for monitoring the output light power of the laser device and controlling stable output of the laser device through a control circuit, light emitted out of the glass gas chamber passes through the second-stage metasurface, beam splitting of orthogonal linear polarization components is achieved, the light enters the two photoelectric detectors respectively, and precise measurement of an external magnetic field is achieved through signal processing of a rear-end circuit. The atomic magnetometer has the advantages that complete precise control over pumping and detection in the atomic magnetometer is achieved through cascading of the light splitting metasurfaces which can be integrated and are in any polarization state, meanwhile, system configuration is simplified, and performance improvement and miniaturization are facilitated.

This invention discloses an integrated light source optimization method for detecting extremely weak magnetic fields, comprising the following steps: S1: Real-time fusion and acquisition of atomic ensemble quantum response trajectories, environmental multi-physics perturbation parameters, historical operating data of the light source, and external spatiotemporal reference signals; S2: Constructing a dynamic state perception matrix based on the acquired data in S1; S3: Generating a collaborative optimization strategy for multi-degree-of-freedom parameters of the light source; S4: Real-time adjustment of the light source parameters and applying the adjusted light field to the atomic magnetometer system; S5: Real-time monitoring of the magnetic field detection performance indicators output by the system, driving a closed-loop feedback mechanism to continuously iteratively optimize the light source parameters. The advantages of this invention compared to existing technologies are: it provides an integrated light source optimization method for detecting extremely weak magnetic fields that enables intelligent collaborative optimization of light source parameters and improves the robustness of the system.

The invention provides a self-excitation type Mx rubidium atom magnetometer device and a working method, the self-excitation type Mx rubidium atom magnetometer device comprises an atom magnetometer probe and an atom magnetometer driving circuit, and the atom magnetometer probe is connected with the atom magnetometer driving circuit; the atom magnetometer probe comprises a VCSEL laser tube, an electro-optical modulator, a 1 / 4 slide, a rubidium atom gas chamber and a photosensitive tube. The atom magnetometer driving circuit comprises a lock-in amplifier, a phase shifter, an EOM driver and a laser tube driver. According to the invention, the atom magnetometer driving circuit synchronously modulates the polarization state and the light intensity of the pumping laser in the rubidium atom magnetometer to form an auto-excitation feedback loop, so that the problem that the radio frequency magnetic field feedback auto-excitation working mode adopted by the traditional Mx magnetometer is not suitable for the rubidium atom magnetometer is solved; and an instable feedback loop is formed.

The invention discloses a transformer magnetic flux leakage detection method and device and a nonvolatile storage medium. The method comprises the steps that the position of a target measuring point on the oil tank wall of a target transformer is determined; at the position of the target measuring point, an original magnetic field signal is obtained through an atomic magnetometer, and the original magnetic field signal is a time sequence signal; based on the original magnetic field signal, a space-time magnetic graph cube is constructed, and the space-time magnetic graph cube represents space distribution information and time change information of a leakage magnetic field of the target transformer; and based on the space-time magnetic graph cube, determining a magnetic flux leakage detection result of the target transformer, the magnetic flux leakage detection result including a magnetic flux leakage fault reason and a magnetic flux leakage fault degree. The technical problem that early-stage accurate capturing and positioning of weak fault signals are difficult to achieve through a traditional transformer magnetic flux leakage detection technology is solved.

The invention provides a steering difference compensation method and system for an atom magnetometer, and the method comprises the steps: constructing a stable magnetic field space, enabling a three-axis magnetometer to be in rigid connection with the atom magnetometer, and calibrating the rotation angle of the atom magnetometer relative to the magnetic field direction through the three-axis magnetometer; performing spatial 360-degree rotation in a stable magnetic field space, recording a magnetic field value corresponding to each angle, totally obtaining a 360-degree steering difference distribution curve of the atom magnetometer, and burning the curve into a signal processor; in actual use, according to the real-time included angle between the atom magnetometer and the magnetic field and the actual magnetic field value corresponding to the included angle, the signal processor calls the steering difference distribution curve, obtains the steering difference under the included angle, processes the steering difference of the compensation atom magnetometer, and obtains the magnetic field value after the steering difference is compensated. According to the technical scheme, the technical problems that in the prior art, an atom magnetometer is high in production cost and large in assembly difficulty are solved.

The application provides a SERF atomic magnetometer and a head nuclear magnetic resonance image automatic registration method, comprising the following steps: obtaining three-dimensional information of a subject's head based on an optical scanner, and dividing the scanning point cloud into two parts of a helmet and a face; performing coarse registration on the helmet model and the helmet point cloud based on an FPFH descriptor, performing fine registration by using an ICP algorithm, and determining the position and direction of the sensor on the three-dimensional scanning data; performing coarse registration on the face point cloud and the head nuclear magnetic resonance image based on face symmetry information, performing fine registration by using an ICP algorithm, and converting the sensor position and direction information to the nuclear magnetic resonance image coordinate system. The registration algorithm realized by the application has the characteristics of automation, high precision and high efficiency, greatly simplifies the registration process, is convenient for medical staff to use, and promotes the medical application of brain magnetism.

The invention relates to an alkali metal atom gas chamber service life batch test method and system, and the method comprises the steps: firstly building an alkali metal atom gas chamber test system, calibrating the gas pressure in a gas chamber, the alkali metal atom number density and the gas chamber transmittance through a light absorption method, and then carrying out the aging of the alkali metal atom gas chamber in the same system, and recalibrating the parameters of the air chamber at intervals to obtain an air chamber parameter change curve, and finally calculating the service life of the air chamber on the basis of the air chamber parameter change curve. According to the invention, batch life test of multiple air chambers can be realized, the influence of manual operation is less, and the device has important significance on the test of alkali metal atom air chambers and has important value on the practical application of quantum instruments such as atom gyroscopes, atom magnetometers and atomic clocks.

The invention discloses a relaxation fluctuation suppression method influenced by temperature change of an optical pump atom magnetometer, and the method comprises the following steps: constructing a relaxation noise model influenced by temperature based on the optical pump atom magnetometer, the relaxation noise model comprising a mapping relation between a measurement error of the optical pump atom magnetometer and a gas chamber temperature of an environment where the relaxation noise model is located; based on the mapping relation and the heat transfer principle, an air chamber heating thermal model is constructed, and the air chamber heating thermal model describes the dynamic relation between the heating film input voltage and the air chamber temperature; updating parameters of the air chamber heating thermal model in real time by applying a self-adaptive model predictive control algorithm; on the basis of the updated thermal model parameters, model predictive control algorithm control is executed so as to restrain air chamber temperature fluctuation, and then relaxation fluctuation of atoms in the optical pump atom magnetometer is restrained; the establishment time and overshoot of air chamber heating are effectively reduced, the low-frequency noise level of the optical pump atom magnetometer is reduced, and the measurement sensitivity is improved.

The invention discloses a magnetic field estimation method based on an adaptive algorithm, and the method comprises the following steps: 1, building a model: building a spin evolution model, a process equation and a detection model in an atomic magnetometer; and 2, establishing an extended Kalman filter, and establishing a self-adaptive extended Kalman filter on the basis of the extended Kalman filter to estimate the magnetic field. A traditional spin noise spectrum cannot solve the problem of time-varying magnetic field tracing, and the actual performance of an extended Kalman filter highly depends on accurate system modeling and is sensitive to system noise changes. According to the method, the requirement of manual parameter tuning is remarkably reduced, and meanwhile, the applicability and operation robustness of Kalman filtering in quantum metering application are improved.

The application discloses a light frequency shift noise suppression device and method for a single-beam atomic magnetometer, and the device comprises a DBR laser, an NTC thermistor and a TEC integrated in the laser, a laser light field regulation external light path, a digital laser controller, a single-beam atomic magnetometer principle prototype, a magnetometer control and detection unit. The application provides a low-frequency light frequency shift noise suppression method based on precise control of the temperature of the DBR laser, adopts a type III compensation network to improve the stability margin of the temperature control loop according to the frequency response characteristics of the laser temperature control loop, eliminates the low-frequency fluctuation of the temperature of the laser, realizes fine thermal tuning of the laser wavelength, thereby suppressing the low-frequency light frequency shift noise caused by the fluctuation of the temperature of the laser in the single-beam atomic magnetometer, and solves the problem of the deterioration of the low-frequency magnetic field measurement sensitivity of the magnetometer. The application can effectively improve the low-frequency performance of the single-beam atomic magnetometer, and is helpful to the extraction of low-frequency biological weak magnetic information.

The application relates to a multi-modal magnetic imaging device and method based on the fusion of NV color centers and a MEMS atomic gas chamber layer. The device comprises: a composite sensing chip, which is sequentially integrated from bottom to top with an NV color center sensing layer, a spacing coupling layer and a MEMS atomic gas chamber layer; the NV color center sensing layer can detect a near-field magnetic signal to generate an NV fluorescence signal in an excited state; the spacing coupling layer can isolate and couple the near-field magnetic signal to the MEMS atomic gas chamber layer; the MEMS atomic gas chamber layer can detect a coupled magnetic signal to generate a magnetic response light signal in a SERF working state; and a processing system can enable the NV color center sensing layer to be in the excited state, enable the MEMS atomic gas chamber layer to be in the SERF working state, and generate a fusion magnetic image based on the two types of signals. The application can solve the problem that related technologies cannot realize efficient magnetic flux coupling between an NV color center sensing unit and an atomic magnetometer of the SERF at a chip level, and realize high-sensitivity and high-fineness magnetic imaging.