CN109613456A - A kind of full optics atom magnetometer and method - Google Patents
A kind of full optics atom magnetometer and method Download PDFInfo
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- CN109613456A CN109613456A CN201811523279.6A CN201811523279A CN109613456A CN 109613456 A CN109613456 A CN 109613456A CN 201811523279 A CN201811523279 A CN 201811523279A CN 109613456 A CN109613456 A CN 109613456A
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- light
- magnetic field
- prism
- air chamber
- light path
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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
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
Abstract
The present invention is suitable for brain Magnetic Measurement Technology field, provides a kind of full optics atom magnetometer and method, comprising: driving light path module, for providing driving light wave；Light path module, for providing detection light wave；Atomic air chamber module, for applying calibration magnetic field；Photoelectric conversion module；For output environment magnetic field parameter.Whereby, the present invention uses two beam perpendicular quadrature laser, is not necessarily to magnetic field modulation, avoids multichannel magnetic field cross-coupling defect.On the other hand, than single beam magnetic field modulation scheme, increase beam of laser, optical control means are abundant, are conducive to the sensitivity for improving atom magnetometer.
Description
Technical field
The present invention relates to brain Magnetic Measurement Technology field more particularly to a kind of full optics atom magnetometer and methods.
Background technique
Atom magnetometer is a kind of sensor that atomic low-intensity magnetic field is just capable of measuring without using liquid helium, in the nearest more than ten years
It is developed rapidly, becomes the ideal magnetic-sensitive elements of magneticencephalogram of new generation.Since brain magnetic signal is mostly in low-frequency range,
It needs to improve atom magnetometer low frequency detectability, generally inhibits 1/f noise using magnetic field modulation, but with magneticencephalogram channel
Number increases, and based on the atom magnetometer of magnetic field modulation when constructing magneticencephalogram, there are multichannel magnetic field cross-couplings, influence brain magnetic
Measurement result.Therefore, it is necessary to one kind can be to avoid the atom magnetometer of multi-channel magnetic field cross-coupling defect.
In summary, the existing technology has inconveniences and defects in actual use, so it is necessary to be improved.
Summary of the invention
For above-mentioned defect, the purpose of the present invention is to provide a kind of complete full optics atom magnetic strength of optics atom magnetometer
Meter and method, use two beam perpendicular quadrature laser, are not necessarily to magnetic field modulation, avoid multichannel magnetic field cross-coupling defect.It is another
Aspect increases beam of laser than single beam magnetic field modulation scheme, and optical control means are abundant, is conducive to improve atom magnetometer
Sensitivity.
To achieve the goals above, the present invention provides a kind of full optics atom magnetometer, comprising:
Light path module is driven, for providing driving light wave；
Light path module, for providing detection light wave；
Atomic air chamber module, for applying calibration magnetic field；
Photoelectric conversion module；For output environment magnetic field parameter.
Full optics atom magnetometer according to the present invention, the driving light path module are set in yz plane comprising driving
Light source, collimating mirror, the polarizer, 1/4 prism and reflecting mirror, and the driving light source is located in collimation mirror foci, light beam is by collimating
Mirror is converted into after collimation directional light and passes sequentially through the polarizer and 1/4 prism along z-axis, is converted into circularly polarized light and by described anti-
It penetrates mirror and reflexes to y-axis and pass through atomic air chamber.
Full optics atom magnetometer according to the present invention, the light path module be set to xz plane on, and with the drive
Dynamic light path module intersects at atomic air chamber.
Full optics atom magnetometer according to the present invention, the light path module include detection light source, collimating mirror, are polarized
Device, reflecting mirror, 1/2 prism and polarization splitting prism；
The detection light source is located at collimation mirror foci, and light beam passes through after being converted into collimation directional light by collimating mirror along z-axis
Inclined device is converted into linearly polarized light and reflexes to x-axis by atomic air chamber by reflecting mirror, reflexes to z-axis by 1/2 by reflecting mirror
Incident polarization Amici prism after polarization direction is rotated 45 ° by prism.
Full optics atom magnetometer according to the present invention, the atomic air chamber module include atomic air chamber and heating component.
Full optics atom magnetometer according to the present invention, the photoelectric conversion module include two photodetectors and preceding storing
Big device；
Two photodetector receives the two-beam of outgoing polarization Amici prism respectively, constitutes balanced detector, described
The photoelectric current of preamplifier receiving balance detector output, exports as magnetometer after differential amplification.
The present invention has the advantages that using the above structure: using two beam perpendicular quadrature laser, is not necessarily to magnetic field modulation, keeps away
Exempt from multichannel magnetic field cross-coupling defect.On the other hand, than single beam magnetic field modulation scheme, increase beam of laser, optical control
Means are abundant, are conducive to the sensitivity for improving atom magnetometer.
Detailed description of the invention
Fig. 1 is full optics atom magnetometer xz floor map；
Fig. 2 is full optics atom magnetometer yz floor map；
Wherein: 1, detection light source, 2, collimating mirror, 3, the polarizer, 4,1/4 prism, 5, reflecting mirror, 6, atomic air chamber, 7,1/2
Prism, 8, polarization splitting prism, 9, photodetector, 10, preamplifier, 11, magnetometer output, 12, driving light source.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Referring to Fig. 1 and Fig. 2, the present invention provides a kind of full optics atom magnetometers comprising:
Light path module is driven, for providing driving light wave；
Light path module, for providing detection light wave；
Atomic air chamber module, for applying calibration magnetic field；
Photoelectric conversion module；For output environment magnetic field parameter.
Specifically, driving light path module is in yz plane, including driving light source 12, collimating mirror 2, the polarizer 3,1/4 rib
Mirror 4, reflecting mirror 5.Driving light source 12 is located in 2 focus of collimating mirror, and light source issues the light beam of corresponding alkali metal atom D1 line wavelength,
Light beam is converted into after collimation directional light by collimating mirror 2 and passes sequentially through the polarizer 3,1/4 prism 4 along z-axis, is converted into circularly polarized light simultaneously
Y-axis is reflexed to by atomic air chamber 6 by reflecting mirror 5, realizes the polarization of atomic spin.
Light path module is in xz plane, is intersected at atomic air chamber 6 with driving light path module, including detection light source
1, collimating mirror 2, the polarizer 3, reflecting mirror 5,1/2 prism 7, polarization splitting prism 8.Detection light source 1 is located at 2 focus of collimating mirror, light
Source issues the light beam of the corresponding detuning 0.1nm wavelength of alkali metal atom D1 line, and light beam is converted into edge after collimation directional light by collimating mirror 2
Z-axis is converted into linearly polarized light and reflexes to x-axis incident atoms gas chamber 6 by reflecting mirror 5 by the polarizer 3.Atomic spin is inclined with line
Vibration detection light interaction makes its polarization direction deflect, and deflection angle includes Magnetic Field.Emergent light is reflected by reflecting mirror 5
Incident polarization Amici prism 8 after polarization direction is rotated 45 ° by 1/2 prism 7 to z-axis, environmental magnetic field will change polarization spectro
Prism 8 is emitted optical power.
Atomic air chamber module includes atomic air chamber 6, heating component.The alkali gold in sensitive magnetic field is wherein filled in atomic air chamber 6
Belong to atom and appropriate buffer gas molecules to inhibit air chamber wall collision relaxation.Electric heating assembly is the heating of atomic air chamber 6, improves alkali
Inhibit spin exohange collision relaxation while metal atom density.
Photoelectric conversion module includes photodetector 9, preamplifier 10.It is inclined that two photodetectors 9 receive outgoing respectively
The two-beam of vibration Amici prism 8, constitutes balanced detector.The photoelectric current of 10 receiving balance detector of preamplifier output, it is poor
It is exported after dividing amplification as magnetic-field measurement.
Full optics atom magnetometer specific working mode are as follows: open driving light source 12, detection light source 1, atomic air chamber 6 and add
Heat；Driving optical wavelength is locked in and absorbs peak position by turntable driving optical wavelength；Scanning Detction optical wavelength will test optical wavelength lock
It is scheduled on and absorbs the detuning 0.1nm in peak position；To full optics atom magnetometer apply calibration magnetic field, within the scope of 90 DEG C -160 DEG C every
5 DEG C of adjusting 6 temperature of atomic air chamber, and turntable driving light light intensity makes preamplifier 10 export maximum, obtains the specific work of magnetometer
Make parameter；Calibration magnetic field is removed, the output of magnetometer 11 is obtained by preamplifier 10 based on above-mentioned calibration coefficient and calculates environment magnetic
, realize magnetic-field measurement.
In conclusion the present invention provides a kind of full optics atom magnetometers, comprising: driving light path module, for providing
Drive light wave；Light path module, for providing detection light wave；Atomic air chamber module, for applying calibration magnetic field；Photoelectric conversion
Module；For output environment magnetic field parameter.Whereby, the present invention uses two beam perpendicular quadrature laser, is not necessarily to magnetic field modulation, avoids more
Channel magnetic field cross-coupling defect.On the other hand, than single beam magnetic field modulation scheme, increase beam of laser, optical control means
It is abundant, be conducive to the sensitivity for improving atom magnetometer.
Certainly, the present invention can also have other various embodiments, without deviating from the spirit and substance of the present invention, ripe
It knows those skilled in the art and makes various corresponding changes and modifications, but these corresponding changes and change in accordance with the present invention
Shape all should fall within the scope of protection of the appended claims of the present invention.
Claims (6)
1. a kind of full optics atom magnetometer characterized by comprising
Light path module is driven, for providing driving light wave；
Light path module, for providing detection light wave；
Atomic air chamber module, for applying calibration magnetic field；
Photoelectric conversion module；For output environment magnetic field parameter.
2. full optics atom magnetometer according to claim 1, which is characterized in that the driving light path module is flat set on yz
On face comprising driving light source, collimating mirror, the polarizer, 1/4 prism and reflecting mirror, and the driving light source is located at collimating mirror coke
On point, light beam is converted into after collimation directional light by collimating mirror and passes sequentially through the polarizer and 1/4 prism along z-axis, is converted into circle
Polarised light simultaneously reflexes to y-axis by the reflecting mirror and passes through atomic air chamber.
3. full optics atom magnetometer according to claim 1, which is characterized in that the light path module is flat set on xz
On face, and intersect at atomic air chamber with the driving light path module.
4. full optics atom magnetometer according to claim 3, which is characterized in that the light path module includes detection
Light source, collimating mirror, the polarizer, reflecting mirror, 1/2 prism and polarization splitting prism；
The detection light source is located at collimation mirror foci, and light beam is converted into after collimation directional light by collimating mirror passes through the polarizer along z-axis
It is converted into linearly polarized light and x-axis is reflexed to by atomic air chamber by reflecting mirror, z-axis is reflexed to by reflecting mirror and passes through 1/2 prism
Incident polarization Amici prism after polarization direction is rotated 45 °.
5. requiring 1~4 described in any item full optics atom magnetometers according to claims, which is characterized in that the original
Sub- gas chamber module includes atomic air chamber and heating component.
6. full optics atom magnetometer according to claim 1, which is characterized in that the photoelectric conversion module includes two light
Electric explorer and preamplifier；
Two photodetector receives the two-beam of outgoing polarization Amici prism respectively, constitutes balanced detector, described preposition
The photoelectric current of amplifier receiving balance detector output, exports as magnetometer after differential amplification.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114966493A (en) * | 2022-07-20 | 2022-08-30 | 北京昆迈医疗科技有限公司 | Miniaturized atomic magnetometer |
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| CN105301541A (en) * | 2015-11-16 | 2016-02-03 | 东南大学 | Measuring device and method of non-orthogonal angle between magnetic coil X and Y axes of atom magnetometer |
| US20160061913A1 (en) * | 2014-08-29 | 2016-03-03 | Canon Kabushiki Kaisha | Optically pumped atomic magnetometer and magnetic sensing method |
| CN105866716A (en) * | 2016-06-23 | 2016-08-17 | 梁尚清 | Novel all-optical type laser light pump magnetometer and realization method thereof |
| CN106291409A (en) * | 2016-08-04 | 2017-01-04 | 北京航天控制仪器研究所 | A kind of atomic sensor device based on hyperfine energy level frequency stabilization |
| CN106443520A (en) * | 2016-11-09 | 2017-02-22 | 北京航空航天大学 | Biaxial atomic spinning magnetometer |
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2018
- 2018-12-13 CN CN201811523279.6A patent/CN109613456A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160061913A1 (en) * | 2014-08-29 | 2016-03-03 | Canon Kabushiki Kaisha | Optically pumped atomic magnetometer and magnetic sensing method |
| CN105301541A (en) * | 2015-11-16 | 2016-02-03 | 东南大学 | Measuring device and method of non-orthogonal angle between magnetic coil X and Y axes of atom magnetometer |
| CN105866716A (en) * | 2016-06-23 | 2016-08-17 | 梁尚清 | Novel all-optical type laser light pump magnetometer and realization method thereof |
| CN106291409A (en) * | 2016-08-04 | 2017-01-04 | 北京航天控制仪器研究所 | A kind of atomic sensor device based on hyperfine energy level frequency stabilization |
| CN106443520A (en) * | 2016-11-09 | 2017-02-22 | 北京航空航天大学 | Biaxial atomic spinning magnetometer |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114966493A (en) * | 2022-07-20 | 2022-08-30 | 北京昆迈医疗科技有限公司 | Miniaturized atomic magnetometer |
| CN114966493B (en) * | 2022-07-20 | 2022-11-04 | 北京昆迈医疗科技有限公司 | Miniaturized atomic magnetometer |
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Effective date of registration: 20191225 Address after: 100089 No. 5, the Summer Palace Road, Beijing, Haidian District Applicant after: Peking University Address before: 100089 postdoctoral collective household, No.5, Yiheyuan Road, Haidian District, Beijing Applicant before: Wei Wei men Effective date of registration: 20191225 Address after: 100089 postdoctoral collective household, No.5, Yiheyuan Road, Haidian District, Beijing Applicant after: Wei Wei men Address before: Room 701-5, Building 6, No. 26, Yongwang West Road, Daxing Zhongguancun Science and Technology Park, Beijing Applicant before: BEIJING KUNMAI BIOMEDICAL RESEARCH INSTITUTE Co.,Ltd. |
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Application publication date: 20190412 |