CN107656220A - A kind of method based on rubidium atom magneto-optic rotation effect measurement magnetic field - Google Patents
A kind of method based on rubidium atom magneto-optic rotation effect measurement magnetic field Download PDFInfo
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- CN107656220A CN107656220A CN201710652951.0A CN201710652951A CN107656220A CN 107656220 A CN107656220 A CN 107656220A CN 201710652951 A CN201710652951 A CN 201710652951A CN 107656220 A CN107656220 A CN 107656220A
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- magnetic field
- rubidium atom
- magneto
- rotation effect
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/032—Measuring direction or magnitude of magnetic fields or magnetic flux using magneto-optic devices, e.g. Faraday or Cotton-Mouton effect
Abstract
The present invention relates to a kind of method based on rubidium atom magneto-optic rotation effect measurement magnetic field, belong to magnetic field measurement technology field.The method of the invention first passes through pumping laser and rubidium atom is carried out into high degree of polarization, Magneto-optic Rotation effect caused by the rubidium atom after polarization and exploring laser light interaction is detected again, and the accurate measurement in magnetic field is realized with reference to the relation between magneto-optic resonant frequency and external magnetic field and high sensitivity low noise and weak Magnetic testi technology；Methods described is simple to operate, and universality is strong, space and geophysics, deep space detection of magnetic field, it is military it is antisubmarine, biomedical etc. suffer from being widely applied prospect, there is important researching value.
Description
Technical field
The present invention relates to a kind of method based on rubidium atom magneto-optic rotation effect measurement magnetic field, belong to magnetic field measurement technology neck
Domain.
Background technology
Weak magnetic detection is the extremely important and research direction that has great prospects for development of tool.At present, mainly using super
Lead quantum interference device (Superconducting Quantum Interference Device) and carry out weak magnetic detection, the inspection
Survey technology is the measurement that base friend's superconductive quantum interference technology is carried out, although the accurate measurement to Weak magentic-field can be realized,
The magnetic force instrument apparatus is complicated, high to operating environment requirements, working service cost is high, and universality is poor, is unfavorable for grinding for weak magnetic detection
Study carefully development.
The content of the invention
The defects of existing for prior art, it is an object of the invention to provide one kind to be based on rubidium atom magneto-optic rotation effect
The method for measuring magnetic field, methods described pass through to Magneto-optic Rotation effect caused by rubidium atom in magnetic field to be measured and light field interaction
Detected, with reference to the relation between magneto-optic resonant frequency and external magnetic field, obtain the magnitude of field intensity in magnetic field to be measured；The side
Method is simple to operate, and universality is strong, in space and geophysics, deep space detection of magnetic field, military antisubmarine, biomedical etc. has
The prospect of being widely applied, there is important researching value.
The purpose of the present invention is achieved through the following technical solutions.
A kind of method based on rubidium atom magneto-optic rotation effect measurement magnetic field, methods described are as follows；
(1) atomic air chamber filled with rubidium atom, nitrogen and argon gas is placed in magnetic field to be measured, and temperature control in atomic air chamber
System is in 80 DEG C~120 DEG C；
(2) pumping laser caused by optically pumped laser makes the rubidium atom in atomic air chamber carry out high degree of polarization；
(3) exploring laser light caused by detecting laser and the rubidium atomic interaction after polarization, make the rubidium atom after polarization
Larmor precession is carried out, obtains the modulated optical signal for including magnetic information；
(4) the modulated optical signal containing magnetic information is converted into successively after polarization beam apparatus, photo-detector, amplifier
Electric signal containing magnetic information；
(5) electric signal containing magnetic information obtains precession frequency f after signal processing unit processes；Further according to as follows
The magnetic field intensity of low-intensity magnetic field to be measured is calculated in formula；
Wherein, B is the magnetic field intensity in magnetic field to be measured, and f is precession frequency, and γ is the magnetic rotaion comparison of rubidium atom, γ value one
As be 7；Pumping laser is mutually perpendicular to exploring laser light, and the off resonance degree of pumping laser and exploring laser light is 2kHz~20kHz, excellent
Select 5kHz~10kHz.
Further, the luminous power of the optically pumped laser output is 30mW~50mW.
The volume ratio of nitrogen and argon gas is 2~6 in atomic air chamber:1.
Beneficial effect：
The method of the invention is measured based on magneto-optic resonance technique, i.e., mutual to rubidium atom in magnetic field and light field
Magneto-optic Rotation effect is detected caused by effect, is recycled the relation between magneto-optic resonant frequency and external magnetic field, is passed through Gao Ling
Sensitivity low noise and weak Magnetic testi technology realizes the accurate measurement in magnetic field；In addition, the measurement apparatus knot that the method for the invention is related to
Structure is simple, and small volume, energy consumption is low, and universality is strong, antisubmarine, biomedical in space and geophysics, deep space detection of magnetic field, military affairs
Etc. suffer from being widely applied prospect, there is important researching value.
Brief description of the drawings
Fig. 1 is the structural representation of the measurement apparatus that method uses described in embodiment.
Fig. 2 is the interphase interaction schematic diagram of laser and rubidium atom in embodiment.
Fig. 3 is the rubidium atom after being polarized in embodiment and the magneto-optic resonance signal figure after exploring laser light interaction.
Fig. 4 is the magnetic field signal figure measured using embodiment methods described.
Wherein, 1- optically pumped lasers, the wave plate of 2- λ/4,3- detecting lasers, 4- polarizers, 5- atomic air chambers, 6- polarizations point
Beam device, 7- photo-detectors, 7-1- photo-detectors I, 7-2- photo-detectors II, 8- amplifiers, 9- signal processing units.
Embodiment
The present invention is further elaborated with reference to the accompanying drawings and detailed description, wherein, methods described is as without especially
Explanation is conventional method, and the raw material can obtain from open commercial sources unless otherwise instructed.
A kind of method based on rubidium atom magneto-optic rotation effect measurement magnetic field, the measurement apparatus that methods described uses include taking out
Laser 1, the wave plate 2 of λ/4, detecting laser 3, polarizer 4, atomic air chamber 5, polarization beam apparatus 6, photo-detector 7-1, light is transported to visit
Device II 7-2, amplifier are surveyed with 8 and signal processing unit 9, as shown in Figure 1；Specific measurement operation is as follows：
(1) atomic air chamber 5 being placed in magnetic field to be measured, the volume ratio of nitrogen and argon gas in atomic air chamber 5 is arranged to 2~
6:1, isoperibol is kept in atomic air chamber 5 and temperature is in the range of 80 DEG C~120 DEG C；
(2) pumping laser caused by optically pumped laser 1 obtains circularly polarized light, circularly polarized light and atom after the wave plate 2 of λ/4
Rubidium atomic interaction in air chamber 5, and high degree of polarization is carried out to rubidium atomic spin, the rubidium atom after polarization shows height
Dichroism；
(3) exploring laser light caused by detecting laser 3 obtains linearly polarized light, linearly polarized light and polarization after polarizer 4
Rubidium atomic interaction afterwards, the rubidium atom after polarization is carried out Larmor precession, obtain the modulated optical comprising magnetic information and believe
Number；
(4) the modulated optical signal containing magnetic information is divided into two paths of signals with except de-noised signal after polarization beam apparatus 6,
Signal pools signal all the way again by the 7-1 of photo-detector I and another way signal after the 7-2 of photo-detector II all the way, then
By amplifier 8, the electric signal containing magnetic information is converted into；
(5) electric signal containing magnetic information obtains precession frequency f after the processing of signal processing unit 9；Further according to as follows
The magnetic field intensity of low-intensity magnetic field to be measured is calculated in formula；
Wherein, B is the magnetic field intensity in magnetic field to be measured, and f is precession frequency, and γ is the magnetic rotaion comparison of rubidium atom, γ value one
As be 7；Optically pumped laser 1 is independently controlled with detecting laser 3, and caused pumping laser, exploring laser light are mutually perpendicular to
(as shown in Figure 2), and the off resonance degree of pumping laser and exploring laser light is 2kHz~20kHz, the luminous power of optically pumped laser 1 exists
Adjusted in 30mW~50mW.
Fig. 3 is the rubidium atom and the magneto-optic resonance signal figure for detecting to obtain after linearly polarized light interaction after polarization, is passed through
Frequency corresponding to amplitude highest peak is exactly to be tested Larmor precession frequency corresponding to magnetic field, root in fourier function fitted figure 2
Magnetic field intensity to be measured can be calculated according to precession frequency caused by rubidium atom Magneto-optic Rotation and the relational expression in measurement magnetic field.Figure
4 be the magnetic field signal figure in magnetic field to be measured, it follows that the present embodiment methods described accurately realizes the magnetic field spy to 10000nT
Survey.
In summary, presently preferred embodiments of the present invention is these are only, is not intended to limit the scope of the present invention.
Within the spirit and principles of the invention, any modification, equivalent substitution and improvements made etc., it should be included in the present invention's
Within protection domain.
Claims (5)
- A kind of 1. method based on rubidium atom magneto-optic rotation effect measurement magnetic field, it is characterised in that：Methods described is as follows；Atomic air chamber (5) filled with rubidium atom, nitrogen and argon gas is placed in magnetic field to be measured by step 1., and in atomic air chamber (5) Keep isoperibol；Pumping laser caused by step 2. optically pumped laser (1) makes the rubidium atom in atomic air chamber (5) carry out high degree of polarization；Exploring laser light caused by step 3. detecting laser (3) and the rubidium atomic interaction after polarization, make the rubidium after polarization former Son carries out Larmor precession, obtains the modulated optical signal for including magnetic information；Modulated optical signal of the step 4. containing magnetic information is successively by polarization beam apparatus (6), photo-detector (7), amplifier (8) Afterwards, it is converted into the electric signal containing magnetic information；Electric signal of the step 5. containing magnetic information obtains precession frequency f after signal processing unit (9) processing；Further according to such as The magnetic field intensity of low-intensity magnetic field to be measured is calculated in lower formula；<mrow> <mi>B</mi> <mo>=</mo> <mfrac> <mrow> <mn>2</mn> <mi>&pi;</mi> </mrow> <mi>&gamma;</mi> </mfrac> <mi>f</mi> </mrow>Wherein, B is the magnetic field intensity in magnetic field to be measured, and f is precession frequency, and γ is the magnetic rotaion comparison of rubidium atom；Pumping laser and detection Laser is mutually perpendicular to, and the off resonance degree of pumping laser and exploring laser light is 2kHz~20kHz.
- A kind of 2. method based on rubidium atom magneto-optic rotation effect measurement magnetic field according to claim 1, it is characterised in that： Temperature in the atomic air chamber (5) is 80 DEG C~120 DEG C.
- A kind of 3. method based on rubidium atom magneto-optic rotation effect measurement magnetic field according to claim 1, it is characterised in that： The volume ratio of the interior nitrogen of the atomic air chamber (5) and argon gas is 2~6:1.
- A kind of 4. method based on rubidium atom magneto-optic rotation effect measurement magnetic field according to claim 1, it is characterised in that： The luminous power of optically pumped laser (1) output is 30mW~50mW.
- A kind of 5. method based on rubidium atom magneto-optic rotation effect measurement magnetic field according to claim 1, it is characterised in that： The off resonance degree of pumping laser and exploring laser light is 5kHz~10kHz.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108627780A (en) * | 2018-04-24 | 2018-10-09 | 上海理工大学 | Weak magnetic quantum sensor-based system based on vector Mathieu light beams |
| CN108693490A (en) * | 2018-04-25 | 2018-10-23 | 中国科学技术大学 | magnetic field intensity measuring device and method |
| CN112367080A (en) * | 2020-09-29 | 2021-02-12 | 中国科学院国家授时中心 | High-contrast atomic clock frequency discrimination signal detection system |
| CN115524644A (en) * | 2022-09-22 | 2022-12-27 | 兰州空间技术物理研究所 | Pumping-detection type atomic magnetometer probe structure |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108627780A (en) * | 2018-04-24 | 2018-10-09 | 上海理工大学 | Weak magnetic quantum sensor-based system based on vector Mathieu light beams |
| CN108627780B (en) * | 2018-04-24 | 2021-03-02 | 上海理工大学 | Vector Mathieu beam-based weak magnetic quantum sensing system |
| CN108693490A (en) * | 2018-04-25 | 2018-10-23 | 中国科学技术大学 | magnetic field intensity measuring device and method |
| CN112367080A (en) * | 2020-09-29 | 2021-02-12 | 中国科学院国家授时中心 | High-contrast atomic clock frequency discrimination signal detection system |
| CN115524644A (en) * | 2022-09-22 | 2022-12-27 | 兰州空间技术物理研究所 | Pumping-detection type atomic magnetometer probe structure |
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Application publication date: 20180202 |