CN106595626A - Nuclear magnetic resonance gyroscope elliptically polarized light detection system - Google Patents
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/58—Turn-sensitive devices without moving masses
- G01C19/60—Electronic or nuclear magnetic resonance gyrometers
- G01C19/62—Electronic or nuclear magnetic resonance gyrometers with optical pumping
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Abstract
The invention relates to a nuclear magnetic resonance gyroscope elliptically polarized light detection system. A light beam generated by a laser is reflected by a reflector, and passes through a polarizer and a lambda/4 wave plate to become elliptically polarized light, after being reflected by the reflector again, the light beam passes through a nuclear magnetic resonance chamber along a horizontal direction, emergent light is reflected by the reflector, and passes through a lambda/2 wave plate, a polarization splitting prism and a right-angle reflecting prism, two light beams with equal light intensity reach a photoelectric detector to be converted into electric signals, and the electric signals are demodulated by a digital processing circuit, finally a gyroscope angular rate signal is extracted. The nuclear magnetic resonance gyroscope elliptically polarized light detection system realizes a method of completing optical pumping and optical detection with one beam of elliptically polarized light, and has the characteristics of improving sensitivity of an optical detection system, simplifying the system structure and facilitating the miniaturization and integration of a gyroscope system.
Description
Technical field
The present invention relates to a kind of magnetic resonance gyroscope instrument elliptical polarization optical detection system, it is possible to increase gyroscope light detection system
System sensitivity, simplifies gyroscope system structure, is easy to the system integration.
Background technology
Western developed country has carried out the research of magnetic resonance gyroscope instrument from the sixties in 20th century, with sending out for science and technology
Exhibition, the key technology bottleneck run in magnetic resonance gyroscope instrument evolution is broken through so that magnetic resonance gyroscope instrument volume
More and more little, precision is more and more high, and this requires that the sensitivity of detecting system is more and more high.Publication number US2013/0328557A1
A kind of method of Detection of linear polarized light atomic spin is disclosed, a branch of D1 lines circularly polarized light is used as pumping light, polarized atom；It is another
Bunch polarized light detects atomic spin as detection light, and its direction is perpendicular to pumping light direction.Also some research worker are adopted
A branch of circularly polarized light completes pumping and detection simultaneously, final to extract gyro angle rate signal by detecting light intensity change.Nuclear-magnetism is total to
The gyroscope optical detection technique that shakes has had and has developed on a large scale very much, and pumping and inspection are completed using two-beam more than current theory and method
Survey so that magnetic resonance gyroscope instrument system complex structure, it is difficult to realize integrated, the miniaturization of system.
The content of the invention
The technology of the present invention solve problem is：Overcome the deficiencies in the prior art, there is provided a kind of magnetic resonance gyroscope instrument is oval partially
Shake optical detection system, using the detecting system, can improve gyroscope detecting system sensitivity, simplied system structure, be easy to be
System miniaturization.
The technical solution of the present invention：For achieving the above object, the technical solution used in the present invention is：A kind of nuclear-magnetism is total to
Shake gyroscope elliptical polarization optical detection system, including laser instrument (1), lens (2), the first reflecting mirror (3), the polarizer (4), λ/4
Wave plate (5), the second reflecting mirror (6), magnetic shielding barrel (7), special-shaped coils (8), without magnetoelectricity heater (9), nuclear magnetic resonance, NMR air chamber
(10), the 3rd reflecting mirror (11), λ/2 wave plate (12), polarization splitting prism (13), right-angle reflecting prism (14), photodetector
(15), digital processing circuit (16)；Wherein nuclear magnetic resonance, NMR air chamber (10) is positioned at the detection of magnetic resonance gyroscope instrument elliptically polarized light
The center of system, surrounds successively from inside to outside without magnetoelectricity heater (9), special-shaped coils (8) and magnetic shielding barrel (7).Magnetic
Shielding bucket (7) is divided into three layers, and the second reflecting mirror (6) and the 3rd reflecting mirror (11) are respectively placed in special-shaped coils (8) and magnetic shielding barrel
(7) left and right sides between innermost layer, laser instrument (1), lens (2), the first reflecting mirror (3), the polarizer (4), λ/4 wave plate (5),
And λ/2 wave plate (12), polarization beam splitter prism (13), right-angle reflecting prism (14), photodetector (15) and digital processing electricity
Road (16) is respectively placed in the outermost outside of magnetic shielding barrel (7).The laser that laser instrument (1) sends is changed into Jing after lens (2) collimation
Collimated light beam, Jing after the first reflecting mirror (3) reflection, elliptically polarized light is become through the polarizer (4), λ/4 wave plate after (5), oval
Jing after the second reflecting mirror (6) reflection, light beam is in the horizontal direction by nuclear magnetic resonance, NMR air chamber (10), and emergent light Jing the 3rd is anti-for polarized light
After penetrating mirror (11) reflection, by λ/2 wave plate (12), polarization beam splitter prism (13), right-angle reflecting prism (14), polarization beam splitter prism
(13) transmitted light is equal with the reflected light light intensity of right-angle reflecting prism (14), reaches photodetector (15) and is changed into telecommunications
Number, the signal of telecommunication is demodulated through digital processing circuit (16), finally extract gyro angle rate signal.
The lens (2) are two lens groups, adjust the distance between two lens so that emergent light be collimated light beam and
Diameter of the spot diameter more than nuclear magnetic resonance, NMR air chamber (10).
The polarizer (4) is Glan-Taylor prism or glan thompson prism or polaroid.
λ/4 wave plate (5) polarization axle is π/8 with the angle of the polarizer (4) polarization axle so that emergent light is elliptical polarization
Light, while completing optical pumping and light detection.
The present invention principle be：The beam of laser that laser instrument sends is changed into elliptical polarization after the polarizer and λ/4 wave plate
Light, elliptically polarized light can be decomposed into the left-handed rotatory polarization and dextrorotation rotatory polarization of a pair of orthogonal.Pumping light can be expressed as：
Wherein ν is laser frequency,WithRespectively dextrorotation and left-handed rotatory polarization base
Arrow,θ represents the folder of λ/4 wave plate optical axis and polarizer optical axis
Angle；Because there are different refractive indexs in the atomic spin direction polarized to left-handed and right-circularly polarized light, so wave vector kr=2 π vnr/
c、kl=2 π vnl/ c, whereinBy adjusting λ/2 wave plate optical axis and polarization splitting prism
Angle α, so as to get the light intensity up to the two-beam of photodetector is equal, the signal of two photodetectors is transported through circuit difference
It is after calculation：
Wherein d=2 π vl/c, l are air chamber diameters, and θ represents the angle of λ/4 wave plate optical axis and polarizer optical axis, and α represents λ/2
The angle of wave plate optical axis and polarization splitting prism,Represent to the real part refractive index of right-circularly polarized light,Represent and dextrorotation is justified
The imaginary part refractive index of polarized light,Represent to the real part refractive index of left circularly polarized light andRepresent the void to left circularly polarized light
Portion's refractive index.
Pumping light is the D1 lines of Cs atoms, and on the one hand the buffer gas of alkali metal plenum interior can reduce atom and air chamber wall
Collision, reduce atom depolarization rate；On the other hand pressure exhibition of the alkali metal atom to light absorbs Lorentz spectral line can be caused
It is wide.The interaction of atom and photon is proportional to (1-sP), and wherein s is spin of photonP is electron spin
Polarization P=<S>/ S, so reflectance is：
nr=1+ κ (1+Pz)L(ν)/ν
nl=1+ κ (1-Pz)L(ν)/ν
Wherein L (ν)=1/ (ν0- ν-i △ ν/2), κ=nrec2F/4 π, n are alkali metal number densitys, reIt is classical electron half
Footpath, f=1/3 is the oscillation intensity of D1 transition, and when α=π/4, differential signal D is：
Wherein absorption cross-section σ=creFIm [L (ν)], light anglec of rotation φ=crefnlPz Re [L (ν)], the light anglec of rotation
φ is proportional to spin polarizability Pz, by being demodulated to differential signal D, finally give gyro angle rate signal.
Present invention advantage compared with prior art is：The present invention completes optical pumping simultaneously using a branch of elliptically polarized light
With light detection, relatively before two-beam completes optical pumping and light detection scheme or a branch of circularly polarized light scheme, and the program can be improved
Detecting system sensitivity, while simplify magnetic resonance gyroscope system structure, is easy to system compact, integrated.
Description of the drawings
Fig. 1 is magnetic resonance gyroscope instrument linear polarization detecting system light channel structure schematic diagram of the present invention.
Specific embodiment
As shown in figure 1, the present invention include laser instrument, lens, the first reflecting mirror, the polarizer, λ/4 wave plate, the second reflecting mirror,
Magnetic shielding barrel, baking box, the 3rd reflecting mirror, λ/2 wave plate, polarization splitting prism, right-angle reflecting prism, photodetector, special-shaped line
Circle, without magnetoelectricity heating, nuclear magnetic resonance, NMR air chamber, digital processing circuit；Magnetic shielding barrel is divided into three layers, and the second reflecting mirror and the 3rd are reflected
Mirror is respectively placed in the left and right sides between special-shaped coils and magnetic shielding barrel innermost layer, laser instrument, lens, the first reflecting mirror, is polarized
Device, λ/4 wave plate, and λ/2 wave plate, polarization beam splitter prism, right-angle reflecting prism, photodetector and digital processing circuit difference
It is placed in the outermost outside of magnetic shielding barrel.
The laser Jing lens that laser instrument sends, the reflecting mirrors of Jing first reflection, are changed into complete line polarized light after the polarizer,
Adjust λ/4 wave plate optical axis and form angle π/8 with the optical axis of the polarizer, then linearly polarized laser is changed into oval inclined after the wave plate of λ/4
Shake light, and Jing after the reflection of the second reflecting mirror, light beam passes through in the horizontal direction nuclear magnetic resonance, NMR air chamber to elliptically polarized light, due to the original for polarizing
Sub- spin direction has different refractive indexs to left-handed and right-circularly polarized light, and the plane of polarization of outgoing polarization light is two-fold so as to occur
Penetrate phenomenon so that outgoing polarization light component relative to it is original incident when have a light swing angle θ, the reflection of the reflecting mirrors of emergent light Jing the 3rd
Afterwards, by rotating λ/2 wave plate so that equal by the two-beam light intensity of polarization splitting prism outgoing, two-beam reaches light electrical resistivity survey
Survey after device and be changed into the signal of telecommunication, the signal of telecommunication is demodulated through digital processing circuit, finally extract gyro angle rate signal.
The lens are two lens groups, adjust the distance between two lens so that emergent light is collimated light beam and light
Speckle area can cover whole nuclear magnetic resonance, NMR air chamber.
The polarizer is Glan-Taylor prism or glan thompson prism or polaroid.
λ/4 wave plate the polarization axle is π/8 with the angle of polarizer polarization axle so that emergent light is elliptically polarized light, together
When complete optical pumping and light detection.
The content not being described in detail in description of the invention belongs to prior art known to professional and technical personnel in the field.
Claims (4)
1. a kind of magnetic resonance gyroscope instrument elliptical polarization optical detection system, it is characterised in that：Including laser instrument (1), lens (2),
First reflecting mirror (3), the polarizer (4), λ/4 wave plate (5), the second reflecting mirror (6), magnetic shielding barrel (7), special-shaped coils (8), without magnetic
It is electric heater unit (9), nuclear magnetic resonance, NMR air chamber (10), the 3rd reflecting mirror (11), λ/2 wave plate (12), polarization splitting prism (13), straight
Corner reflection prism (14), photodetector (15), digital processing circuit (16)；Wherein nuclear magnetic resonance, NMR air chamber (10) is common positioned at nuclear-magnetism
Shake the center of gyroscope elliptical polarization optical detection system, surrounds successively from inside to outside without magnetoelectricity heater (9), abnormity
Coil (8) and magnetic shielding barrel (7)；Magnetic shielding barrel (7) is divided into three layers, and the second reflecting mirror (6) and the 3rd reflecting mirror (11) are put respectively
The left and right sides between special-shaped coils (8) and magnetic shielding barrel (7) innermost layer, laser instrument (1), lens (2), the first reflecting mirror
(3), the polarizer (4), λ/4 wave plate (5), and λ/2 wave plate (12), polarization beam splitter prism (13), right-angle reflecting prism (14), light
Electric explorer (15) and digital processing circuit (16) are respectively placed in the outermost outside of magnetic shielding barrel (7)；Laser instrument (1) sends
Laser is changed into collimated light beam Jing after lens (2) collimation, Jing after the first reflecting mirror (3) reflection, through the polarizer (4), λ/4 wave plate
(5) elliptically polarized light is become after, elliptically polarized light is Jing after the second reflecting mirror (6) reflection, and light beam is common by nuclear-magnetism in the horizontal direction
Shake air chamber (10), emergent light Jing the 3rd reflecting mirror (11) reflection after, by λ/2 wave plate (12), polarization beam splitter prism (13), right angle
Reflecting prism (14), the transmitted light of polarization beam splitter prism (13) is equal with the reflected light light intensity of right-angle reflecting prism (14), reaches
Photodetector (15) is changed into the signal of telecommunication, and the signal of telecommunication is demodulated through digital processing circuit (16), finally extracts top
Spiral shell angle rate signal.
2. a kind of magnetic resonance gyroscope instrument elliptical polarization optical detection system according to claim 1, it is characterised in that：It is described
Lens (2) are two lens groups, adjust the distance between two lens so that emergent light is that collimated light beam and spot diameter are more than
The diameter of nuclear magnetic resonance, NMR air chamber (10).
3. a kind of magnetic resonance gyroscope instrument elliptical polarization optical detection system according to claim 1, it is characterised in that：It is described
The polarizer (4) is Glan-Taylor prism or glan thompson prism or polaroid.
4. a kind of magnetic resonance gyroscope instrument elliptical polarization optical detection system according to claim 1, it is characterised in that：It is described
Wave plate (5) polarization axle in λ/4 is π/8 with the angle of the polarizer (4) polarization axle so that emergent light is elliptically polarized light, while completing
Optical pumping and light are detected.
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Cited By (7)
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| CN108844532A (en) * | 2018-08-14 | 2018-11-20 | 北京航天控制仪器研究所 | It is a kind of to use oblique incidence sounding optical path microminiature magnetic resonance gyroscope instrument |
| CN110617810A (en) * | 2019-08-16 | 2019-12-27 | 中国航空工业集团公司西安飞行自动控制研究所 | Nuclear magnetic resonance gyro detection system and method |
| CN110849343A (en) * | 2019-11-12 | 2020-02-28 | 中国船舶重工集团公司第七0七研究所 | Single-laser nuclear magnetic resonance gyroscope |
| CN112444241A (en) * | 2020-10-23 | 2021-03-05 | 北京航空航天大学 | Closed-loop atomic spin gyroscope based on optical frequency shift control |
| CN114322974A (en) * | 2021-12-28 | 2022-04-12 | 之江实验室 | Rb based on MEMS gas chamber-131Xe atomic spin gyroscope single beam detection system and method |
| CN114543783A (en) * | 2022-01-20 | 2022-05-27 | 中国船舶重工集团公司第七0七研究所 | Double-penetrating type detection system and detection method for SERF gyroscope |
| CN114674246A (en) * | 2022-03-02 | 2022-06-28 | 北京航空航天大学 | Small-angle differential detection module and detection method based on polarization grating |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108844532A (en) * | 2018-08-14 | 2018-11-20 | 北京航天控制仪器研究所 | It is a kind of to use oblique incidence sounding optical path microminiature magnetic resonance gyroscope instrument |
| CN108844532B (en) * | 2018-08-14 | 2020-11-20 | 北京航天控制仪器研究所 | Microminiature nuclear magnetic resonance gyroscope using oblique incidence detection light path |
| CN110617810A (en) * | 2019-08-16 | 2019-12-27 | 中国航空工业集团公司西安飞行自动控制研究所 | Nuclear magnetic resonance gyro detection system and method |
| CN110617810B (en) * | 2019-08-16 | 2023-07-21 | 中国航空工业集团公司西安飞行自动控制研究所 | Nuclear magnetic resonance gyro detection system and method |
| CN110849343A (en) * | 2019-11-12 | 2020-02-28 | 中国船舶重工集团公司第七0七研究所 | Single-laser nuclear magnetic resonance gyroscope |
| CN112444241A (en) * | 2020-10-23 | 2021-03-05 | 北京航空航天大学 | Closed-loop atomic spin gyroscope based on optical frequency shift control |
| CN114322974A (en) * | 2021-12-28 | 2022-04-12 | 之江实验室 | Rb based on MEMS gas chamber-131Xe atomic spin gyroscope single beam detection system and method |
| CN114543783A (en) * | 2022-01-20 | 2022-05-27 | 中国船舶重工集团公司第七0七研究所 | Double-penetrating type detection system and detection method for SERF gyroscope |
| CN114543783B (en) * | 2022-01-20 | 2024-02-23 | 中国船舶重工集团公司第七0七研究所 | Double-penetrating detection system and detection method for SERF gyroscope |
| CN114674246A (en) * | 2022-03-02 | 2022-06-28 | 北京航空航天大学 | Small-angle differential detection module and detection method based on polarization grating |
| CN114674246B (en) * | 2022-03-02 | 2023-11-17 | 北京航空航天大学 | Small-angle differential detection module and detection method based on polarization grating |
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Application publication date: 20170426 |