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42 results about "Larmor precession" patented technology
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In physics, Larmor precession (named after Joseph Larmor) is the precession of the magnetic moment of an object about an external magnetic field. Objects with a magnetic moment also have angular momentum and effective internal electric current proportional to their angular momentum; these include electrons, protons, other fermions, many atomic and nuclear systems, as well as classical macroscopic systems. The external magnetic field exerts a torque on the magnetic moment,
Rubidium atomic magnetometer and magnetic field measuring method thereof
ActiveCN107015172ALarge measuring rangeMagnetic field sampling rate adjustableMagnetic field measurement using magneto-optic devicesData acquisitionWork flow
The invention discloses a rubidium atomic magnetometer and a magnetic field measuring method. Based on the principle of nonlinear magneto-optic rotation, and through combination of timing control and tracking type frequency locking control, the atomic magnetometer achieves a large dynamic measurement range, high magnetic field sampling rate and high sensitivity. A DSP timing control module controls on-off of an acousto-optic modulator and a radio-frequency signal source in the physical part of the rubidium atomic magnetometer according to timing combination to adjust the magnetic field sampling rate N. The DSP timing control module further controls acquisition triggering of a data acquisition card. A calculation unit gets the Larmor precession frequency (f) through fast Fourier transform with use of a received rubidium atom Larmor precession free relaxation signal, and further calculates the value of an external magnetic field. The calculation unit selects a high magnetic field sampling rate module or a low magnetic field sampling rate module before measurement according to the pre-judged dynamic range of a to-be-measured magnetic field, and sets whether a tracking type frequency locking work mode is used when the low magnetic field sampling rate module is selected. In the working process, data is acquired and processed, and the value of the magnetic field is output.
Owner:LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
Electromagnetic field treatment apparatus and method for using same
InactiveUS7896797B2Simple processIncrease coverageElectrotherapyMagnetotherapy using coils/electromagnetsOrganismal ProcessTissue repair
Larmor Precession makes specific predictions about bound ion dynamics, based upon specific combinations of AC and DC magnetic fields. Especially significant is the fact that the external magnetic field environment determines the overall qualities of resonances or particular changes in bio-effects. Given a target with a particular gyromagnetic ratio, Larmor Precession makes predictions that are determined solely by a magnetic field environment itself. An embodiment according to the present invention comprises specific combinations of AC and DC magnetic fields configured to produce specific bio-effects. Preferably an embodiment according to the present invention comprises using Larmor Precession to develop Electromagnetic Field environments targeted towards enhancing or diminishing specific biological processes, including tumor growth, bone and tissue repair, and biological processes and using Larmor Precession to generate magnetic field conditions that take advantage of specific behaviors, including resonances conditions.
Owner:ENDONOVO THERAPEUTICS INC
Miniature nuclear magnetic resonance gyroscope
The invention belongs to a gyroscope device in the field of inertia measurement and relates to a miniature nuclear magnetic resonance atomic gyroscope. The miniature nuclear magnetic resonance atomic gyroscope comprises a vacuum room filled with alkali metal and a gas mixture of inert gases. The inside of the top of the vacuum room is plated with a reflective film. A laser for releasing light beam used for pumping and detection is arranged at the bottom of the vacuum room. Two detectors are symmetrically arranged at two sides of the laser and are used for detecting rotation speed signals. Helmholtz coils used for generating a transverse oscillating magnetic field are arranged at two sides of the vacuum room. Solenoid coils used for generating a static magnetic field required by Larmor precession of atomic nucleus surround an optical system composed of the vacuum room, the laser and the Helmholtz coils. The outside of the solenoid coils adopts a shielding structure for magnetic shielding. Volume of the gyroscope is reduced, influence of jitter due to light intensity on precision of the gyroscope is effectively lowered, and precision of the gyroscope is enhanced.
Owner:FLIGHT AUTOMATIC CONTROL RES INST
Atomic spin precession detecting method and atomic spin precession detecting device based on electro-optic modulation
InactiveCN106093808AEasy to integrate applicationsSimple modulationMagnetic field measurement using magneto-optic devicesTurn-sensitive devicesSpin effectAlkali metal
The invention relates to an atomic spin procession detecting method and an atomic spin precession detecting device based on electro-optic modulation. Alkali metal atoms in a spin-exchange relaxation free state are used for sensing an external magnetic field or angular rate, thereby generating atomic spin Larmor precession. An electro-optic modulator is used for performing electro-optic modulation on detected laser. Through output light strength detection by the electro-optic modulator and demodulation of a phase-locked amplifier, output light strength and frequency doubling signal strength are obtained. Finally a signal acquisition and processing circuit measures an atomic spin precession signal, and furthermore measurement to the external magnetic field or inertia can be realized. According to the atomic spin procession detecting method and the atomic spin procession detecting device, advantages such as simple modulation, small size, high sensitivity, low temperature effect and simple operation condition in the electro-optic modulator are exerted. The atomic spin procession detecting method and the atomic spin procession detecting device have relatively high sensitivity and relatively high stability. The novel atomic spin procession detecting method is based on an atomic spin effect and can be used for industrial integration and practical application of atomic spin sensing devices in future.
Owner:BEIHANG UNIV
Aeromagnetic field vector detecting device and detecting method
InactiveCN105929458AHigh precisionHigh response frequencyElectric/magnetic detectionAcoustic wave reradiationResponse FrequencyPolarizer
The invention relates to an aeromagnetic field vector detecting device and a detecting method, a DFB laser which has the same lasing frequency with an alkali metal atom D1 wire is adopted as a pump light source, the light emitted by the DFB laser generates circular polarization pump light polarized alkali metal atoms with free adjustable laser power through an optical isolator, an optical attenuator, a polarizer and a lambda / 4 wave plate, and the atom is made to have macroscopic magnetic moment. A detected weak magnetic field in a y axis direction makes the magnetic moment to generate Larmor precession on an xoz plane around the y axis. The polarization plane rotation of the linearly polarized light caused by circular dichroism of a polarized atom, the pump light is removed, the deflection angle gradually vibrates and attenuates to zero, a zero-cross detection device is adopted to detect the time difference between the time of removing the pump light and the first zero crossing point, the Larmor prescession frequency can be obtained, and a magnetic-field vector value is obtained by dividing the Larmor prescession frequency by a gyromagnetic ratio. According to the invention, the device and the method have the advantages of high magnetic-field vector detection precision, fast response frequency and good repeatability, and are suitable for aeromagnetic field vector detecting mobile platform magnetic measurement.
Owner:JILIN UNIV
Magnetic signal enhancing device for low-field nuclear magnetic resonance imaging instrument and making method thereof
PendingCN108226834AEnhanced Magnetic Resonance Radio Frequency Field Magnetic SignalEnhanced RF field magnetic signalDiagnostic recording/measuringMeasurements using NMR imaging systemsCapacitanceLow field nuclear magnetic resonance
The invention relates to a magnetic signal enhancing device for a low-field nuclear magnetic resonance imaging instrument and a making method thereof and solves the problem that low-field magnetic resonance imaging equipment is low in image signal-to-noise ratio and space resolution rate when compared with the prior art. An artificial electromagnetic structure resonance unit comprises a metal square spiral line etched on the upper surface of a substrate, a metalized via hole is formed in each of two ends of the metal square spiral line and penetrates the substrate, a metal microstrip line is printed on the lower surface of the substrate and connected with the metalized via holes, and a non-magnetic patch capacitor is welded on the metal microstrip line. The artificial electromagnetic structure resonance unit formed by connecting the metal square spiral line on the front of the substrate with a microstrip loaded with the non-magnetic patch capacitor on the back of the substrate throughthe metalized via hole has negative magnetic conductivity at low-field magnetic resonance Larmor precession frequency, and the artificial electromagnetic structure resonance unit can effectively enhance magnetic resonance radio frequency field magnetic signals by utilizing the negative magnetic conductivity.
Owner:ANHUI UNIVERSITY
Self-sustaining regeneration system and Larmor procession self-sustaining regeneration method
ActiveCN106996775AExtended spin precession coherence timeHigh precisionTurn-sensitive devicesMagnitude/direction of magnetic fieldsEngineeringQuantum gyroscope
The invention discloses a self-sustaining regeneration system and a Larmor precession self-sustaining regeneration method. The self-sustaining regeneration system comprises an optical pump, a detecting part, an atomic air chamber, a magnetic field, a magnetic shielding part and a circuit control part; wherein the optical pump and the detecting part are used for preparing atomic state and detecting atomic Larmor precession; the atomic air chamber and the magnetic field and the magnetic shielding part are used for providing working atoms and magnetic field environment of high stability and high uniformity; and the circuit control part is used for controlling pump light, detecting light timing sequence and completing self-sustaining regeneration process. According to the self-sustaining regeneration system and the Larmor precession self-sustaining regeneration method, a problem of short spin procession coherence time of a current quantum gyroscope is solved, a quantum gyroscope scheme extending the spin precession coherent time of the atoms is provided, accuracy and dynamic range of the quantum gyroscope are significantly improved, absolute magnetic field strength can be measured at the same time, and accuracy of magnetic field measurement is significantly improved.
Owner:TSINGHUA UNIV
Integrated measurement method of constant and non-orthogonal angle of three-axis coil
ActiveCN107490775AHigh measurement accuracyHigh sensitivityElectrical measurementsMeasurement deviceDirect effects
The invention discloses an integrated measurement method of a constant and a non-orthogonal angle of a three-axis coil, and belongs to the technical field of optical detection, and magnetic field detection and analysis. Based on a problem that the precision of magnetic fields generated by the three-axis coil directly affect the sensitivity of an ultrahigh sensitivity magnetic field / inertia measurement device based on the non-spin exchange theory, the invention provides the integrated measurement method of the constant and the non-orthogonal angle of three-axis coil based the atomic spin Larmor precession theory. The provided method fills a gap of lack of a rapid and efficient integrated measurement method of the constant and the non-orthogonal angle of a three-axis coil, and provides preconditions and guarantee for the sensitivity of atom magnetometers.
Owner:BEIHANG UNIV
Novel radio frequency atom magnetometer and implementation method thereof
ActiveCN111610470ALarge measuring rangeRealize measurementMagnetic field measurement using magneto-optic devicesRf fieldPolarizer
The invention discloses a novel radio frequency atom magnetometer and an implementation method thereof. According to the invention, the method comprises the steps: enabling the laser wavelength to bestable, and keeping resonance between the laser wavelength and the alkali metal atom ground state energy level; enabling a polaroid to be perpendicular to the direction of the laser beam to change laser into linearly polarized laser; enabling the linearly polarized laser to pass through the atomic gas chamber and to be received by the photoelectric detector, wherein the direction of the linearly polarized laser is parallel or vertical to the direction of the to-be-measured alternating magnetic field; enabling the static magnetic field to be stable and unchanged, wherein the direction is parallel to the linear polarization laser direction, and the radio frequency field direction is perpendicular to the to-be-measured alternating magnetic field direction; enabling the photoelectric detectorto detect the light intensity value change of all the linearly polarized lasers passing through the atomic gas chamber and outputting a voltage value, collecting the voltage value through the feedbackcontroller, and performing feedback control on the signal generator, so that the absolute value of the difference between the radio frequency field frequency and the to-be-measured alternating magnetic field frequency is equal to the Larmor precession frequency of alkali metal atoms; and calculating the frequency and the magnetic induction intensity of the to-be-measured alternating magnetic field according to the magnetic resonance spectrum. The method has the advantages of simple operation and large measurement range.
Owner:HANGZHOU DIANZI UNIV +1
Static magnetic field spatial distribution measuring system and method based on atomic magnetic resonance
ActiveCN111025206ASimple calculationImprove spatial resolutionMagnetic measurementsSpatial light modulatorDetector array
A small-scale space static magnetic field space distribution measuring method based on atomic magnetic resonance is used for measuring the space distribution uniformity of a static magnetic field, andadopts the basic principle that an atomic air chamber filled with alkali metals (K, Rb, Cs and the like) is placed in the static magnetic field, and circularly polarized light is selected to polarizeatoms of the alkali metals (K, Rb, Cs and the like). A radio frequency field perpendicular to the static magnetic field is adopted to enable alkali metal (K, Rb, Cs and the like) atoms to be subjected to magnetic resonance, a photoelectric detector array detects the light intensity of the circularly polarized light penetrating through a gas chamber, and the static magnetic field intensity is obtained according to the Larmor precession frequency of the alkali metal (K, Rb, Cs and the like) atoms. The spatial position of the circularly polarized light is changed through a spatial light modulator, or magnetic field intensity distribution measuring in a small-scale space is realized by adopting the photoelectric detector linear array.
Owner:BEIJING INST OF AEROSPACE CONTROL DEVICES
Electromagnetic field treatment apparatus and method for using same
InactiveUS20090069626A1Simple processIncrease coverageElectrotherapyMagnetotherapy using coils/electromagnetsTissue repairResonance
Larmor Precession makes specific predictions about bound ion dynamics, based upon specific combinations of AC and DC magnetic fields. Especially significant is the fact that the external magnetic field environment determines the overall qualities of resonances or particular changes in bio-effects. Given a target with a particular gyromagnetic ratio, Larmor Precession makes predictions that are determined solely by a magnetic field environment itself. An embodiment according to the present invention comprises specific combinations of AC and DC magnetic fields configured to produce specific bio-effects. Preferably an embodiment according to the present invention comprises using Larmor Precession to develop Electromagnetic Field environments targeted towards enhancing or diminishing specific biological processes, including tumor growth, bone and tissue repair, and biological processes and using Larmor Precession to generate magnetic field conditions that take advantage of specific behaviors, including resonances conditions.
Owner:ENDONOVO THERAPEUTICS INC
Current metering device and method based on quantum natural references
The invention discloses a current metering device and method based on quantum natural references. The current metering device comprises a to-be-measured magnetic field generation assembly, a pumping-detection type atom magnetometer 3 and a quantum current measurement assembly. The to-be-measured magnetic field generation assembly comprises a magnetic shielding cylinder 1, a standard coil 2 and a current source 8. The magnetic shielding cylinder 1 is used for shielding a geomagnetic field, the standard coil 2 is arranged in the magnetic shielding cylinder 1 in an axial symmetry mode, and the current source 8 inputs a current to the standard coil 2 to generate a to-be-measured magnetic field. A probe part of the pumping-detection type atom magnetometer 3 is arranged at the geometric center of the standard coil 2 and is used for measuring a uniform magnetic field on the axis of the standard coil 2. The quantum current measurement assembly comprises a standard resistor 4 calibrated by a quantum resistance reference and a standard voltmeter 5 calibrated by a quantum voltage reference. Based on the principle that a magnetic field value measured by the pumping-detection type atom magnetometer 3 and a current value in the standard coil 2 are in a linear relation, metering of a current in a wide measuring range from microampere (10 <-6 > A) to ampere (A) is achieved. The coil coefficient of the standard coil 2 is traced to three quantum natural references including Josephson effect (voltage), quantum Hall effect (resistance) and Larmor precession effect (magnetic induction intensity).
Owner:LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
Rubidium atomic magnetometer
InactiveCN107656219AAccurate measurementHigh sensitivityMagnetic field measurement using magneto-optic devicesPrecessionResonance
Owner:LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
Laser heating nuclear magnetic resonance gyroscope
ActiveCN107702705AHigh sensitivityImprove detection accuracyTurn-sensitive devicesGyroscopeLaser light
The invention provides a laser heating nuclear magnetic resonance gyroscope, which consists of: a quartz vacuum chamber, an atomic gas chamber, a 3D orthogonal coil, a heating laser light source, an optical fiber temperature measurement module, a pumping laser light source, a detection laser light source, a balance photoelectric amplifier, and a lock-in amplifier. Specifically, the lock-in amplifier analyzes the amplified detection optical signal output by the balance photoelectric amplifier and a reference drive signal of the 3D orthogonal coil to obtain the reference drive signal's frequencycomponent information of the 3D orthogonal coil in the balance photoelectric amplifier, and the frequency component information is sent a programmable logic controller; the programmable logic controller controls the power of the heating laser light source according to the surface temperature of the atomic gas chamber, and resolves the larmor precession frequency information of the nuclear magnetic resonance gyroscope according to the frequency component information. The laser heating nuclear magnetic resonance gyroscope provided by the invention can thoroughly eliminate complementary magneticfield interference caused by electrical heating and resistance temperature measurement, and can effectively improve the detection precision and sensitivity of the nuclear magnetic resonance gyroscope.
Owner:SHANGHAI JIAO TONG UNIV
Atomic magnetometer probe based on optical virtual magnetic field technology
ActiveCN112180302ARealize high sensitivity measurementImprove signal-to-noise ratioMagnetic sensor packagingWater resource assessmentHelium atomHemt circuits
The invention discloses an atomic magnetometer probe based on an optical virtual magnetic field technology, which relates to the technical field of atomic magnetometers, and aims to solve the problemsthat the existing atomic magnetometer is low in signal-to-noise ratio and cannot perform high-sensitivity measurement on a magnetic field. The atomic magnetometer probe comprises a laser, a 1 / 2 waveplate, a polarization beam splitter prism, a 1 / 4 wave plate, an atomic gas chamber, a photoelectric detector, a semi-transparent and semi-reflective mirror, a frequency discrimination module and a PIDfeedback circuit. The atomic magnetometer probe utilizes laser to control atoms to extract magnetic field information sensed by the atoms, namely, utilizes the relationship between the spin of unpaired electrons or helium atom electrons on the outer layer of gaseous alkali metal cesium atoms and a magnetic field, controls the electron energy level transition in the atoms through an optical method, and realizes the frequency measurement of atomic Larmor precession, and thus, high-sensitivity measurement of the atomic magnetometer on the magnetic field is realized. The atomic magnetometer probeis suitable for the detection field.
Owner:NO 49 INST CHINESE ELECTRONICS SCI & TECH GRP
System and method for increasing signal-to-noise ratio of Larmor precession signal of Overhauser magnetic sensor
InactiveCN110618464AImprove signal-to-noise ratioEffective noise impactElectric/magnetic detectionAcoustic wave reradiationFilter algorithmRandom noise
The invention provides a system and method for increasing the signal-to-noise ratio of a Larmor precession signal of an Overhauser magnetic sensor. The system comprises the Overhauser magnetic sensor,a sensor excitation unit, an FID signal processing unit and a power supply battery, wherein a signal excitation end of the Overhauser magnetic sensor is connected with a radio frequency excitation signal in the sensor excitation unit, a signal receiving end of the Overhauser magnetic sensor is connected to a direct-current pulse excitation end and the FID signal processing unit through a single-pole double-throw switch, and a signal connection path of the Overhauser magnetic sensor is selected by controlling the single-pole double-throw switch. According to the method, an LC resonance and narrow-band filter is utilized firstly to limit the frequency band of the Larmor signal, primary noise reduction is performed, a time-frequency peak filtering algorithm is used for performing secondary noise reduction and signal reconstruction on the Larmor signal, random noise and noise introduced by a conditioning circuit can be further suppressed, and the signal-to-noise ratio of the Larmor signalis substantially increased.
Owner:CHINA UNIV OF GEOSCIENCES (WUHAN)
A rubidium atomic magnetometer and its magnetic field measurement method
ActiveCN107015172BLarge dynamic measuring rangeHigh Magnetic Field Sampling RateMagnetic field measurement using magneto-optic devicesData acquisitionWork flow
Owner:LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
Magnetic field measuring device
PendingCN113447861AImprove accuracyReduce volumeMagnitude/direction of magnetic fieldsParticle physicsLaser detection
The invention relates to a magnetic field measuring device which comprises a laser detection module comprising a laser, a detector and a control module, and a magnetic induction module comprising an atomic gas chamber and a reflector. The magnetic induction module is arranged in a magnetic field to be measured, and a first optical signal with the frequency consistent with the transition frequency of atoms is input into the atomic gas chamber through the laser to polarize the atoms, so that the atoms in the atom air chamber perform Larmor precession under the action of the magnetic field to be measured; the control module performs amplitude modulation on the first optical signal, so that the modulated first optical signal is input into the atomic gas chamber and then returns to the atomic gas chamber through the reflective mirror to form a second optical signal, and the detector acquires a light intensity signal of the second optical signal and sends the light intensity signal to the control module; the control module determines the magnetic field intensity of the magnetic field to be measured according to the light intensity signal and the gyromagnetic ratio of the atoms. Electrical noise interference of the detector on atoms in the atomic gas chamber can be avoided, the sensitivity of the magnetic induction module is improved, and the temperature of the atomic gas chamber is reduced.
Owner:北京量子信息科学研究院
Non-invasive remote substance detection device based on ground and field nuclear magnetic resonance
ActiveCN112859185ANo change in physical and chemical propertiesLow instantaneous long-distance energy transfer propertiesNuclear radiation detectionHigh energyZeeman energy
The invention discloses a non-invasive remote substance detection device based on ground and ball field nuclear magnetic resonance, which is based on a nuclear magnetic resonance technology principle, that is, by utilizing Zeeman energy level splitting and Larmor precession of a substance magnetic atomic nucleus induced by an earth magnetic field, a detection area is irradiated by extremely-low-frequency electromagnetic excitation pulses; a specific magnetic atomic nucleus absorbs photon energy carried by a specific radio frequency and jumps from a low energy level to a high energy level to generate a nuclear magnetic resonance signal; and a nuclear magnetic resonance signal is detected and sensed by virtue of a signal receiving device, so that qualitative and spatial positioning of a detected target substance is realized. The device has a clear scientific basis and a clear technical implementation approach, is not restricted by the type and physical form of a detected substance in the detection process, and does not change the physical and chemical properties of the detected substance, so that the device is a non-invasive remote substance detection device; and the device not only can be applied to underground mineral resource exploration, but also can be applied to related fields such as environmental protection and archaeological.
Owner:河南拉莫尔量子科技有限公司 +2
Magnetic field measurement method and atomic magnetometer system
PendingCN113466756AIncrease pump rateImprove polarizationMagnetic field measurement using magneto-optic devicesControl signalParticle physics
The invention provides a magnetic field measurement method and an atomic magnetometer system. The method comprises the steps that: a light intensity modulator is controlled to carry out periodic modulation on laser, so as to obtain pump light and detection light, the light intensity of the pump light is greater than the light intensity of the detection light; the light intensity modulator is controlled to modulate the pump light to obtain modulated pump light with a modulation signal; a signal detector is controlled to receive changed detection light obtained after the detection light passes through Larmor procession of a polarization state atom, and obtains a polarization rotation angle signal of the changed detection light, the polarization state atom is generated by the modulated pump light acting on an atom probe, and Larmor procession of the polarization state atom is generated under a magnetic field to be detected; and the polarization rotation angle signal is demodulated, and the value of the magnetic field to be detected is calculated according to the frequency of the modulation signal. With the magnetic field measurement method and the atomic magnetometer system adopted, the problem of low sensitivity of an atomic magnetometer in the prior art is solved.
Owner:SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
Constant current source device based on quantum natural references and implementation method
PendingCN113687115AElectrical measurement instrument detailsElectrical testingHomogeneous magnetic fieldMagnetic shield
The invention discloses a constant current source device based on quantum natural references and an implementation method. The constant current source device comprises a magnetic shielding cylinder 1, a standard coil 2, a pumping-detection type atom magnetometer 3, a current source 4, a computer 5 and a load 6. The magnetic shielding cylinder 1 is used for shielding a geomagnetic field, the standard coil 2 is arranged in the magnetic shielding cylinder 1 in an axial symmetry mode, and the current source 4 supplies a current to the load 6 and the standard coil 2 to generate a magnetic field. A probe part of the pumping-detection type atom magnetometer 3 is arranged at the geometric center of the standard coil 2 and is used for measuring a uniform magnetic field on the axis of the standard coil 2. The computer 5 is connected with the current source 4 and is used for controlling the current supplied to the load 6 and the standard coil 2 by the current source 4. The current output by the precision current source is locked to the Larmor precession frequency corresponding to magnetic resonance Zeeman transition, the stability of the output current of the precision current source is effectively improved, drift is reduced, and a low-drift constant current source device based on a quantum natural reference can be obtained.
Owner:LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
Spin noise spectrum-based calibration device for measuring weak field by Hall magnetometer
ActiveCN113687290AAvoid errorsImprove signal-to-noise ratioElectrical measurementsHelmholtz coilPrism
The invention belongs to the technical field of atomic measurement, and discloses a spin noise spectrum-based calibration device for measuring a weak field by a Hall magnetometer, which comprises a detection light source, wherein first detection light output by the detection light source passes through a first half-wave plate, a first polarizer and a lens, then enters an atomic gas chamber along an X direction, passes through a second half-wave plate, a first Wollaston prism, and then is detected by a first balance detector; the atomic gas chamber is arranged in a magnetic shielding cylinder, and a first Helmholtz coil used for providing a magnetic field in the Y direction is arranged in the magnetic shielding cylinder; the output end of the first balance detector is connected with a first fast Fourier transform dynamic signal analyzer. And the first fast Fourier transform dynamic signal analyzer is used for analyzing the detection signal to obtain a corresponding Larmor precession frequency. The device can realize calibration of the Hall magnetometer and can be widely applied to the field of magnetometer calibration.
Owner:SHANXI UNIV
Self-sustained regeneration system and Larmor precession self-sustained regeneration method
ActiveCN106996775BExtended spin precession coherence timeHigh precisionTurn-sensitive devicesMagnitude/direction of magnetic fieldsGyroscopeEngineering
The invention discloses a self-sustaining regeneration system and a Larmor precession self-sustaining regeneration method. The self-sustaining regeneration system comprises an optical pump, a detecting part, an atomic air chamber, a magnetic field, a magnetic shielding part and a circuit control part; wherein the optical pump and the detecting part are used for preparing atomic state and detecting atomic Larmor precession; the atomic air chamber and the magnetic field and the magnetic shielding part are used for providing working atoms and magnetic field environment of high stability and high uniformity; and the circuit control part is used for controlling pump light, detecting light timing sequence and completing self-sustaining regeneration process. According to the self-sustaining regeneration system and the Larmor precession self-sustaining regeneration method, a problem of short spin procession coherence time of a current quantum gyroscope is solved, a quantum gyroscope scheme extending the spin precession coherent time of the atoms is provided, accuracy and dynamic range of the quantum gyroscope are significantly improved, absolute magnetic field strength can be measured at the same time, and accuracy of magnetic field measurement is significantly improved.
Owner:TSINGHUA UNIV
Magnetic field measurement method of single-beam light turn-back pumping detection configuration and atomic magnetometer
ActiveCN114089235AIncrease pump rateImprove polarizationMagnetic field measurement using magneto-optic devicesParticle physicsQuantum electrodynamics
The invention discloses a magnetic field measurement method of a single-beam light turn-back pumping detection configuration and an atomic magnetometer. The method comprises the steps: carrying out periodic modulation on light intensity of laser through a light intensity modulator to obtain modulated pump light; enabling the modulated pump light to pass through a light beam regulator in an atomic probe to obtain detection light; enabling a signal detector to receive changed detection light with a polarization plane rotating, wherein the changed detection light is obtained after the returned detection light passes through a Larmor precession action of a polarization state atom; obtaining a polarization rotation angle signal, wherein the polarization state atom is generated by the modulated pump light acting on the atom gas chamber of the atom probe, and the larmor precession of the polarization state atom is generated under the to-be-measured magnetic field; and demodulating the polarization rotation angle signal, and calculating according to the frequency of the modulation signal to obtain the value of the to-be-measured magnetic field. According to the invention, the problems that in the prior art, two laser beams are input to detect the magnetic field, so that the light path of the whole system is complex, miniaturization and array design of the atomic magnetometer is not facilitated, and the applicability of the atomic magnetometer is reduced are solved.
Owner:SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
Method for determining a pulse duration T90 of a 90° pulse in a nuclear magnetic measuring method and respective nuclear magnetic flowmeter
ActiveUS10408651B2Reduce effortVolume/mass flow measurementAnalysis using nuclear magnetic resonanceCapacitanceCoupling
A method for determining a pulse duration T90 of a 90° pulse in a nuclear magnetic measuring method. A signal generator has a known generator resistance RS, wherein a coil has a coil impedance ZL with a coil resistance RL and a coil reactance XL, wherein a coupling circuit has an adjustable matching capacitance CM and an adjustable tuning capacitance CT, and wherein the medium has a Larmor precession having an angular Larmor frequency ωP. The time needed for determining the pulse duration T90 of the 90° pulse is reduced by the matching capacitance CM and the tuning capacitance CT being set so that the angular resonance frequency ω0 corresponds to the angular Larmor frequency ωP and by power matching being present between the signal generator and the coil. The coil resistance RL is determined and the pulse duration T90 is determined as a function of the coil resistance RL.
Owner:KRONE GMBH
Magnetic field gradient measurement method and atomic magnetic gradiometer system
PendingCN113671424AIncrease pump rateImprove polarizationMagnetic field measurement using flux-gate principleMagnetic field measurement using galvano-magnetic devicesMagnetic field magnitudeLarmor precession
The invention discloses a magnetic field gradient measurement method and an atomic magnetic gradiometer system. The method comprises the steps of controlling a light modulator to process laser, and obtaining pump light and probe light, controlling a light modulator to periodically modulate the pump light to obtain modulated pump light with a modulation signal, controlling the signal detector to receive second change detection light obtained after the detection light sequentially passes through the Larmor advance action of the first polarization state atom and the Larmor advance action of the second polarization state atom, and acquiring a polarization rotation angle signal of the second change detection light, demodulating a polarization rotation angle signal of the first change detection light, calculating to obtain the value of a first external magnetic field to be measured according to the frequency of the modulation signal, and acquiring the magnetic field intensity at the first polarization state atom at the same time. The sensitive and compact method for simultaneously measuring the magnetic field intensity and the magnetic field gradient is realized, common-mode noise in magnetic field gradient measurement can be inhibited, and the sensitivity and the precision of magnetic field gradient measurement are improved.
Owner:SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
A kind of microwave power detector based on spin pumping effect and its preparation method
ActiveCN106990284BSimple structureReduce manufacturing costPower measurement by galvanomagnetic effect devicesHeterojunctionMaterials science
The invention relates to the technical field of microwave electronic equipment, and provides a microwave power detector based on the spin pumping effect and a preparation method thereof. The microwave power detector based on the spin pumping effect includes a micro-nano scale device, and the micro-nano scale The device includes a heterogeneous structure composed of a magnetic thin film layer and a nonmagnetic heavy metal thin film layer. The nonmagnetic heavy metal thin film layer is grown on the magnetic thin film layer; the magnetic moment of the magnetic thin film layer of the micro-nano scale device undergoes ferromagnetic resonance under microwave excitation. Larmor precession, the spin pump generates spin current and injects it into the non-magnetic heavy metal thin film layer. During the test of the inverse spin Hall voltage, the magnetic field integral value of the inverse spin Hall voltage and the value of the microwave power Satisfying a certain linear relationship, the detector has a simple structure, reduces the manufacturing cost of the detector, has a wide range of testing frequencies, high linearity of testing microwave power, and a wide range of applications.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Matching device and method
PendingCN113109882AImprove matching efficiencyIncrease working frequencyElectric/magnetic detectionAcoustic wave reradiationEngineeringSingle chip
The invention provides a matching device and method, which belong to the field of measurement. The matching device comprises an attitude sensor, a coil, a single-chip microcomputer and a matching channel group, wherein the matching channel group comprises a plurality of mutually independent branch channels which are oppositely arranged in pairs; one end of the coil is connected with one side of one or more branch channels in the matching channel group through a first shielding line, and the other end of the coil is grounded; the other side of the branch channel receives a signal through a second shielding line; and the attitude sensor is connected with a signal input port of the single-chip microcomputer. According to the method, an approximate value of a measured magnetic field is obtained through an attitude sensor, and according to the relation between Larmor precession frequency and a geomagnetic field in classical physics, a single-chip microcomputer determines an accessed branch channel by searching a matching network list; and the bandwidth of all combination modes of each branch channel in the matching channel group covers the frequency of the whole magnetic field measurement range. The method can greatly improve the matching efficiency, solves the problem that the equipment is always in a matching state, and improves the working frequency and stability of the equipment.
Owner:XIAN HUASHUN MEASURING EQUIP
A method and device for detecting atomic spin precession based on electro-optical modulation
InactiveCN106093808BEasy to integrate applicationsSimple modulationMagnetic field measurement using magneto-optic devicesTurn-sensitive devicesSpin effectAlkali metal
Owner:BEIHANG UNIV
A high-precision coherent population-confined cpt rubidium atom magnetometer
ActiveCN109799468BIncrease signal strengthHigh measurement accuracyMagnetic field measurement using magneto-optic devicesBeam splittingData acquisition
The invention discloses a high-precision coherent population trapped CPT rubidium atom magnetometer, including a VCSEL laser, a collimating lens, an electro-optic modulator, a λ / 2 wave plate, a polarization beam splitter prism, a reflector, a λ / 4 wave plate, and ITO Heater, atomic gas chamber, photoelectric detector, feedback module, temperature control module, data acquisition module, host computer, circuit control module and 3.417GHz microwave source. After the laser is modulated, the left-handed circularly polarized light and the right-handed circularly polarized light with equal light intensity pass through the atomic gas cell to generate two CPT signals, which are differentially processed to obtain the Larmor precession frequency, and then according to the Larmor precession frequency The relationship between the dynamic frequency and the strength of the magnetic field, to achieve accurate measurement of the magnetic field. The invention adds a feedback system and a new type of atomic gas chamber, has the advantages of high precision, high sensitivity, low power consumption, small volume, etc., and has important application value in biomedicine, geophysics, military detection and the like.
Owner:CHINA JILIANG UNIV
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