CN109883410A - A kind of double-core spin magnetic frequency shift suppressing method - Google Patents

A kind of double-core spin magnetic frequency shift suppressing method Download PDF

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CN109883410A
CN109883410A CN201711281148.7A CN201711281148A CN109883410A CN 109883410 A CN109883410 A CN 109883410A CN 201711281148 A CN201711281148 A CN 201711281148A CN 109883410 A CN109883410 A CN 109883410A
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magnetic field
nuclear
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CN109883410B (en
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秦杰
万双爱
孙晓光
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Beijing Automation Control Equipment Institute BACEI
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Beijing Automation Control Equipment Institute BACEI
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Abstract

The invention belongs to error cancelling methods, and in particular to a kind of double-core spin magnetic frequency shift suppressing method.It includes: step 1: heating is set to no magnetic heating component for atomic air chamber and is heated to 120 DEG C or more, step 2: polarization, step 3: resonance, step 4: detection makes detection laser enter atomic air chamber by the polarizer, detects resonant frequency.Step 5: step 6: overturning electron-spin polarization direction calculates.The effect of the application is: present applicant proposes a kind of double-core spin magnetic frequency shift suppressing method, main advantage is on the basis of atom magnetometer active magnetic compensation, inhibits double-core spin magnetic frequency shift error drift, to promote the bias instaility of gyro.

Description

A kind of double-core spin magnetic frequency shift suppressing method
Technical field
The invention belongs to error cancelling methods, and in particular to a kind of double-core spin magnetic frequency shift suppressing method.
Background technique
Magnetic resonance gyroscope based on atom manipulation technology forward position progress, have high-precision, small size, pure solid-state, The comprehensive advantages such as acceleration is insensitive are one of the following high-precision, the main direction of development of microminiature gyroscope technology.Nuclear magnetic resonance Gyro needs shielding environment magnetic field, the influence that isolation magnetic field measures nuclear spin precession.It is general to use " based on high permeability material Passive magnetic screen+active magnetic compensation based on atom magnetometer " scheme is realized.Passive magnetic screen is generally only able to achieve 105~106 Field decay coefficient, further field decay on this basis needs using the active magnetic compensation based on atom magnetometer Technology.The remnant field variation under magnetic screen environment can be theoretically compensated by atom magnetometer.Due to nuclear spin and electronics The magnetic field that spin generates can be experienced by other side, and the magnetic field of electron spin generation is experienced in nuclear spin, two in magnetic resonance gyroscope The difference in electron spin magnetic field is experienced in kind nuclear spin, and atom magnetometer active magnetic compensation is difficult to remove, and causes nuclear spin precession frequency Rate offset error.As magnetic resonance gyroscope develops to high-precision, it is three-dimensional active magnetic compensation technique that this error, which be can not ignore, Difficult point to be solved.
Summary of the invention
The application in view of the drawbacks of the prior art, provides a kind of double-core spin magnetic frequency shift suppressing method.
The application is achieved in that a kind of double-core spin magnetic frequency shift suppressing method, includes the following steps:
Step 1: heating
It is set to no magnetic heating component 5 and atomic air chamber 10 is heated to 120 DEG C or more, for increasing atomic density.
Step 2: polarization
Driving laser (1) is irradiated to atomic air chamber (10), the optical source wavelength of driving laser (1) is selected as alkali metal atom The D1 line of electron spin；The three dimensional coils 11 are by Impetus of Current Source, for generating the magnetic field of three orthogonal directions, first Apply constant current source in Z axis forward direction, it is made to generate stationary magnetic field Bz.The circuit polarizer 3, which is adjusted, arrives left-hand polarization direction.
Step 3: resonance
A branch of detection laser is from the proximal surface vertical incidence atomic air chamber for driving laser entrance face, for detecting atomic spin, Defining its incident direction is that X-axis is positive；Apply ac-excited magnetic field in three dimensional coils X-direction by current source, makes two seed nucleus Nuclear magnetic resonance occurs for spin.
Step 4: detection
So that detection laser 13 is entered atomic air chamber 10 by the polarizer 12, detects resonant frequency.
Step 5: overturning electron-spin polarization direction
Circuit polarizer 3 is adjusted and arrives dextropolarization direction, is flipped electron-spin polarization direction.
Step 6: it calculates
When carrier is rotated with angular speed Ω, in two seed nucleus of carrier system observation before the overturning of electron-spin polarization direction Spin resonance frequency distinguishes ωL1With ωL2:
In formula, δ1With δ2The amplification coefficient that electron spin magnetic field is experienced in respectively two kinds of nuclear spins, it is related to atomic species, For physical constant.γ1、γ2Respectively two kinds of nuclear spin gyromagnetic ratios are physical constant.
It is available in conjunction with above-mentioned two formula:
After the overturning of electron-spin polarization direction, two kinds of nuclear spin resonance frequency ω are detectedL1' and ωL2':
It is available in conjunction with above-mentioned two formula:
The nuclear spin resonance frequency detected twice before and after electron-spin polarization direction will be overturn and do Difference Calculation, i.e. formula (1), (2) do Difference Calculation, eliminate the difference that electron spin magnetic field is experienced in two kinds of nuclear spins, and magnetic resonance gyroscope offset is caused to miss Difference:
It is as described above a kind of based on electron spin-nuclear spin coupling high-precision Measurement Method for Magnetic Field, wherein for quick Feel the two kinds of nuclear spins and the electron spin of alkali metal atom, other miscellaneous function gas atoms of the inert gas of angular movement N2。
It is as described above a kind of based on electron spin-nuclear spin coupling high-precision Measurement Method for Magnetic Field, wherein described Three dimensional coils (11) are by Impetus of Current Source, for generating the magnetic field of three orthogonal directions, apply constant current in Z axis forward direction Source makes it generate stationary magnetic field Bz, applies the excitation of two kinds of alternating currents in X-axis, generates the alternating current magnetic field of two kinds of frequencies, and two Kind frequency respectively corresponds the intrinsic Larmor precession frequency of two kinds of nuclear spins.
It is as described above a kind of based on electron spin-nuclear spin coupling high-precision Measurement Method for Magnetic Field, wherein described 3 polarization direction of circuit polarizer is adjustable.
The effect of the application is: present applicant proposes a kind of double-core spin magnetic frequency shift suppressing method, main advantage exists In on the basis of atom magnetometer active magnetic compensation, inhibiting double-core spin magnetic frequency shift error drift, to promote gyro Bias instaility.
Detailed description of the invention
Fig. 1 is a kind of schematic diagram of double-core spin magnetic frequency shift suppressing method of the invention.
In figure: 1. driving laser, 2. polarizers, 3. circuit polarizers, 4. atomic air chamber brackets, 5. are without magnetic heating component, 6. Analyzer, 7. photodetectors, 8. preamplifiers, 9. processing circuits, 10. atomic air chambers, 11. main field coils, 13. detections swash Light, 12. polarizers.
Specific embodiment
A kind of double-core spin magnetic frequency shift suppressing method, includes the following steps:
Step 1: heating
It is set to no magnetic heating component 5 and atomic air chamber 10 is heated to 120 DEG C or more, for increasing atomic density.It is described Atomic air chamber 10 inside the electronics of two kinds of nuclear spins comprising the inert gas for sensitive angular movement and alkali metal atom Spin, other miscellaneous function gas atom N2。
Step 2: polarization
A branch of driving laser 1 passes sequentially through three dimensional coils 11, the polarizer 2, circuit polarizer 3, vertical to inject atomic air chamber 10 A face, defining its incident direction is that Z axis is positive, and for the electron spin for the alkali metal atom that polarizes, photon angular momentum is passed Electron spin is passed, the polarizability of electron spin is made to reach P.The three dimensional coils 11 are by Impetus of Current Source, for generating The magnetic field of three orthogonal directions applies constant current source in Z axis forward direction first, it is made to generate stationary magnetic field Bz.
Angular momentum is passed to nuclear spin by polarized electron spin, realizes the polarization of inert gas nuclear spin.
The optical source wavelength of the driving laser 1 is selected as the D1 line of the electron spin of alkali metal atom.
The circuit polarizer 3, which is adjusted, arrives left-hand polarization direction.
Step 3: resonance
A branch of detection laser is from the proximal surface vertical incidence atomic air chamber for driving laser entrance face, for detecting atomic spin, Defining its incident direction is that X-axis is positive；Y-axis forward direction is defined according to right-hand rule, establishes XYZ rectangular coordinate system；Pass through current source Apply ac-excited magnetic field in three dimensional coils X-direction, make two kinds of nuclear spins that nuclear magnetic resonance occur, when carrier is with angular speed Ω hair When raw rotation, ω is distinguished in two kinds of nuclear spin resonance frequencies of carrier system observationL1With ωL2:
In formula, δ1With δ2The amplification coefficient that electron spin magnetic field is experienced in respectively two kinds of nuclear spins, it is related to atomic species, For physical constant.γ1、γ2Respectively two kinds of nuclear spin gyromagnetic ratios are physical constant.
It is available in conjunction with above-mentioned two formula:
Since the amplification coefficient that electron spin magnetic field is experienced in two kinds of nuclear spins is different, electron spin magnetic is experienced in two kinds of nuclear spins The difference of field, atom magnetometer active magnetic compensation are difficult to remove, and cause nuclear spin precession frequency offset error, and then cause nuclear-magnetism Resonate gyro offset error.
Step 4: detection
So that detection laser 13 is entered atomic air chamber 10 by the polarizer 12, detects resonant frequency ωL1With ωL2。
Step 5: overturning electron-spin polarization direction
Circuit polarizer 3 is adjusted and arrives dextropolarization direction, is flipped electron-spin polarization direction.Two are detected at this time Kind nuclear spin resonance frequency ωL1' and ωL2':
In formula, δ1With δ2The amplification coefficient that electron spin magnetic field is experienced in respectively two kinds of nuclear spins, it is related to atomic species, For physical constant.γ1、γ2Respectively two kinds of nuclear spin gyromagnetic ratios are physical constant.
It is available in conjunction with above-mentioned two formula:
Step 6: Difference Calculation
The nuclear spin resonance frequency detected twice before and after electron-spin polarization direction will be overturn and do Difference Calculation, i.e. formula (1), (2) do Difference Calculation, eliminate the difference that electron spin magnetic field is experienced in two kinds of nuclear spins, and magnetic resonance gyroscope offset is caused to miss Difference:

Claims (4)

  1. The magnetic frequency shift suppressing method 1. a kind of double-core spins, which is characterized in that include the following steps:
    Step 1: heating
    It is set to no magnetic heating component 5 and atomic air chamber 10 is heated to 120 DEG C or more, for increasing atomic density.
    Step 2: polarization
    Driving laser (1) is irradiated to atomic air chamber (10), the optical source wavelength of driving laser (1) is selected as the electronics of alkali metal atom The D1 line of spin；The three dimensional coils 11 are by Impetus of Current Source, for generating the magnetic field of three orthogonal directions, first in Z Axis forward direction applies constant current source, it is made to generate stationary magnetic field Bz.The circuit polarizer 3, which is adjusted, arrives left-hand polarization direction.
    Step 3: resonance
    A branch of detection laser is defined from the proximal surface vertical incidence atomic air chamber of driving laser entrance face for detecting atomic spin Its incident direction is that X-axis is positive；Apply ac-excited magnetic field in three dimensional coils X-direction by current source, makes two kinds of nuclear spins Nuclear magnetic resonance occurs.
    Step 4: detection
    So that detection laser 13 is entered atomic air chamber 10 by the polarizer 12, detects resonant frequency.
    Step 5: overturning electron-spin polarization direction
    Circuit polarizer 3 is adjusted and arrives dextropolarization direction, is flipped electron-spin polarization direction.
    Step 6: it calculates
    When carrier is rotated with angular speed Ω, in two kinds of nuclear spins of carrier system observation before the overturning of electron-spin polarization direction Resonant frequency distinguishes ωL1With ωL2:
    In formula, δ1With δ2The amplification coefficient that electron spin magnetic field is experienced in respectively two kinds of nuclear spins, it is related to atomic species, it is object Manage constant.γ1、γ2Respectively two kinds of nuclear spin gyromagnetic ratios are physical constant.
    It is available in conjunction with above-mentioned two formula:
    After the overturning of electron-spin polarization direction, two kinds of nuclear spin resonance frequency ω are detectedL1' and ωL2':
    It is available in conjunction with above-mentioned two formula:
    The nuclear spin resonance frequency that detects twice before and after electron-spin polarization direction will be overturn and do Difference Calculation, i.e., formula (1), (2) Difference Calculation is done, the difference that electron spin magnetic field is experienced in two kinds of nuclear spins is eliminated, causes magnetic resonance gyroscope offset error:
  2. The magnetic frequency shift suppressing method 2. a kind of double-core as described in claim 1 spins, it is characterised in that: for sensitive angular movement Inert gas two kinds of nuclear spins and the electron spin of alkali metal atom, other miscellaneous function gas atom N2。
  3. 3. as described in claim 1 a kind of based on electron spin-nuclear spin coupling high-precision Measurement Method for Magnetic Field, feature Be: the three dimensional coils (11) are applied for generating the magnetic field of three orthogonal directions in Z axis forward direction by Impetus of Current Source Add constant current source, it is made to generate stationary magnetic field Bz, applies two kinds of alternating current excitations in X-axis, generate the friendship of two kinds of frequencies Magnetic field is flowed, two kinds of frequencies respectively correspond the intrinsic Larmor precession frequency of two kinds of nuclear spins.
  4. 4. as described in claim 1 a kind of based on electron spin-nuclear spin coupling high-precision Measurement Method for Magnetic Field, feature Be: 3 polarization direction of circuit polarizer is adjustable.
CN201711281148.7A 2017-12-06 2017-12-06 Dual-core spin magnetic frequency shift suppression method Active CN109883410B (en)

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Cited By (3)

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CN112556678A (en) * 2020-11-24 2021-03-26 北京航空航天大学 Method for measuring nuclear polarizability of atomic spin gyroscope based on adiabatic fast channel
CN112924910A (en) * 2021-01-29 2021-06-08 北京航空航天大学 In-situ magnetometer-based method for measuring residual magnetism in shielding barrel
CN109883410B (en) * 2017-12-06 2021-09-14 北京自动化控制设备研究所 Dual-core spin magnetic frequency shift suppression method

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Publication number Priority date Publication date Assignee Title
CN109883410B (en) * 2017-12-06 2021-09-14 北京自动化控制设备研究所 Dual-core spin magnetic frequency shift suppression method
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CN112924910A (en) * 2021-01-29 2021-06-08 北京航空航天大学 In-situ magnetometer-based method for measuring residual magnetism in shielding barrel
CN112924910B (en) * 2021-01-29 2022-07-26 北京航空航天大学 In-situ magnetometer-based method for measuring residual magnetism in shielding barrel

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