阅读说明：本技术 一种两自由度原子干涉陀螺仪 (Two-degree-of-freedom atomic interference gyroscope ) 是由 胡忠坤 程玲 徐文杰 程源 周敏康 段小春 刘杰 张程 于 2019-10-25 设计创作，主要内容包括：本发明公开一种两自由度原子干涉陀螺仪,包括：原子制备模块,用于制备磁不敏感态的原子团,并将制备的原子团竖直上抛；原子干涉模块,用于在原子团上抛到干涉区时,利用拉曼光作用于原子团,使其进行朝向同轴的两个方向的分束,再对两个方向的分束分别进行反射,并使两个方向反射的分束分别与原始原子团的重合,每个方向的反射分束与原始原子团的重合形成该方向的原子干涉,进而实现原子团在两个方向的同时干涉；原子探测模块,用于利用拉曼光探测两个方向同时干涉后的原子团,分别选出两个方向的预设动量态的原子的数目,并根据两个方向预设动量态原子的数目同时确定两个方向的转速。本发明实现两轴同时干涉,且同时实现两轴转速的测量。(The invention discloses a two-degree-of-freedom atomic interference gyroscope, which comprises: the atom preparation module is used for preparing magnetically insensitive atomic groups and vertically polishing the prepared atomic groups upwards; the atomic interference module is used for utilizing Raman light to act on the atomic groups when the atomic groups are thrown to an interference region, so that the atomic groups are split in two coaxial directions, then the split beams in the two directions are respectively reflected, the split beams reflected in the two directions are respectively superposed with the original atomic groups, the reflected split beams in each direction and the superposed original atomic groups form atomic interference in the direction, and further the simultaneous interference of the atomic groups in the two directions is realized; and the atom detection module is used for detecting the atomic groups interfered in two directions simultaneously by using Raman light, selecting the number of atoms in the preset momentum state in the two directions respectively, and determining the rotating speeds in the two directions simultaneously according to the number of atoms in the preset momentum state in the two directions. The invention realizes the simultaneous interference of two shafts and the measurement of the rotating speed of the two shafts.)

1. A two-degree-of-freedom atomic interferometric gyroscope, comprising: the atomic preparation module, the atomic interference module and the atomic detection module;

the atom preparation module is used for preparing magnetically insensitive atomic groups and vertically throwing the prepared atomic groups upwards;

the atomic interference module is used for utilizing Raman light to act on the atomic groups when the atomic groups are thrown to an interference region, so that the atomic groups are split in two coaxial directions, the split beams in the two directions are reflected respectively, the split beams reflected in the two directions are superposed with the original atomic groups respectively, the reflected split beams in each direction and the superposed original atomic groups form atomic interference in the direction, and further the simultaneous interference of the atomic groups in the two directions is realized;

the atom detection module is used for detecting the atomic groups subjected to simultaneous interference in the two directions by using Raman light, respectively selecting the number of atoms in the preset momentum state in the two directions, and simultaneously determining the rotating speeds in the two directions according to the number of atoms in the preset momentum state in the two directions.

2. The two-degree-of-freedom atomic interference gyroscope according to claim 1, wherein the action process of raman light on atomic groups in the atomic interference module is as follows:

when the atom group prepared by the atom preparation module moves upwards in a parabola manner to the first pi/2 pulse sequence of Raman light, two beams of Raman light in the x-axis direction and the y-axis direction act on the atom group at the same time, and beam splitting in the x-axis direction and the y-axis direction of the atom group is realized;

when the two split beams of atomic groups move upwards in a parabola mode to the first pi pulse sequence of Raman light, the two beams of Raman light in the x-axis direction and the y-axis direction act simultaneously, and the first reflection of the split beams of atomic groups in the x-axis direction and the split beams of atomic groups in the y-axis direction is achieved;

when the two first-reflected radicals move downwards in a parabolic mode to a second pi pulse sequence of the Raman light, the two beams of Raman light in the x-axis direction and the y-axis direction act simultaneously, and second reflection of the first-reflected radicals in the x-axis direction and the y-axis direction is achieved;

when the two secondary reflected radicals move downwards in a parabolic mode to the second pi/2 pulse sequence of the Raman light, the two beams of Raman light in the x-axis direction and the y-axis direction act simultaneously, and the combination of the secondary reflected radicals in the x-axis direction and the secondary reflected radicals in the y-axis direction is achieved.

3. The two-degree-of-freedom atomic interference gyroscope according to claim 2, wherein the detection process of the atomic groups by the raman light in the atomic detection module is as follows:

utilizing Raman light in the x-axis direction to act on atom groups which are in parabolic descending motion in the x-axis direction, pumping momentum states of the atom groups to preset momentum states, collecting atoms in the preset momentum states in the x-axis direction, and determining the number of atoms in the preset momentum states in the x-axis direction;

and utilizing Raman light in the y-axis direction to act on the atomic groups which are in parabolic descending motion in the y-axis direction, pumping the momentum states of the atomic groups to preset momentum states, collecting atoms in the preset momentum states in the y-axis direction, and determining the number of atoms in the preset momentum states in the y-axis direction.

4. The two-degree-of-freedom atomic interference gyroscope according to claim 3, wherein the simultaneous determination of the rotation speeds in two directions according to the number of the preset momentum state atoms specifically comprises the steps of:

fitting according to the number of preset momentum state atoms in the x-axis direction to obtain interference fringes of the atoms in the x-axis direction, and calculating to obtain the probability P of the atoms in the x-axis direction_F＝2,xAnd F represents the total atomic angular momentum;

fitting according to the number of preset momentum state atoms in the y-axis direction to obtain interference fringes of the atoms in the y-axis direction, and calculating to obtain the probability P of the atoms in the y-axis direction_F＝2,y；

Determining atomic interference phase shift in the x-axis direction and the y-axis direction according to a relation between the probability and the phase shift in the x-axis direction and the y-axis direction:

wherein phi is_xPhase shift, phi, representing atomic interference in the x-axis direction_yPhase shift representing atomic interference in the y-axis direction;

determining the rotating speeds in the directions of the x axis and the y axis according to the relation between the phase shift in the directions of the x axis and the y axis and the rotating speed:

φ_x＝4k_eff,x(Ω_y×g_z)T³

φ_y＝4k_eff,y(Ω_x×g_z)T³

wherein k is_eff,xEffective wave vector, k, of Raman light in the x-axis direction_eff,yEffective wave vector, g, of Raman light in the y-axis direction_zRepresenting the acceleration of gravity, T representing the time that the atom takes from the first pi/2 pulse to the first pi pulse, omega_xDenotes the rotational speed in the x-axis direction, Ω_yThe rotation speed in the y-axis direction is indicated.

5. The two-degree-of-freedom atomic interference gyroscope of claim 4, wherein the atoms in the group of atoms in the magnetically insensitive state are | F ═ 1, m_F0 > atoms in the state, wherein F represents the total angular momentum of the atoms and m_FRepresenting the number of magnetic quanta.

6. The two-degree-of-freedom atomic interference gyroscope of claim 4, wherein the atoms with the x-axis direction in the preset momentum state and the atoms with the y-axis direction in the preset momentum state are two different momentum states of the F2 state

7. The two-degree-of-freedom atomic interference gyroscope of any one of claims 1-6, wherein the atom preparation module cools the trapped atomic group with trapping light selected at | F ═ 1, m when the gyroscope is in operation_F0 > atoms on state and is thrown vertically upwards.

Technical Field

The invention relates to the technical field of inertial measurement, in particular to a two-degree-of-freedom atomic interference gyroscope.

Background

The inertial navigation system has the advantages of autonomous navigation, is rapidly developed and widely applied in the aspects of aviation, land and underwater navigation, and the magnitude and direction of acceleration and rotating speed in the inertial navigation system are constantly changed, so that accurate positioning needs to be given in real time, and the magnitudes of different acceleration and rotating speed must be determined at the same time. Therefore, achieving simultaneous measurements of multi-axis acceleration and rotational speed is very important for inertial navigation systems. In addition, the method has important application prospects in the fields of basic scientific research, gravity measurement, resource exploration, gravity-assisted navigation and the like.

In the aspect of rotating speed measurement, the cold atom interference gyroscope realized by utilizing the Sagnac effect of atomic substance waves is expected to be applied to a new generation of inertial navigation technology due to higher potential sensitivity, and is mainly focused in the fields of missile launching, aerospace, deep space exploration and the like. The high-precision inertial navigation system needs three-axis real-time measurement of acceleration and rotating speed to obtain the attitude of the carrier in real time.

Currently, many international groups utilize atomic interference gyroscopes to realize multi-axis rotation speed measurement, but the atomic interference gyroscopes do not realize simultaneous measurement of multi-axis rotation speed; such as: in 2006, the french astronomical stage Lagrangin group uses a three-pulse pair-throwing scheme to respectively act on the same beam of raman light on the y Axis and the z Axis to realize the measurement of the rotating speed of two axes, and proposes to use a four-pulse configuration to realize the measurement of the rotating speed of the x Axis for the first time, namely the group does not realize the multi-Axis simultaneous measurement (references: b.canuel, f.leduc, d.holleville, a.gauguet, j.fils, a.virdis, a.clairon, n.dimanc, ch.j.borde', and a.landragin.six-Axis inert Sensor Using Cold-Atom interference, PRL 97,010402 (2006)); in 2014, the university of new mexico in the United states also realizes two-Axis measurement by adopting three-pulse pair throwing configuration as a whole, but the university of new mexico also carries out uniaxial atomic interferometry (the reference is Akash V.et all, Dual-Axis High-Data-Rate Interferometer via Cold energy Exchange, PRA 2,054012 (2014)).

The existing atomic interference gyroscope only realizes multi-axis rotating speed measurement through time-sharing measurement, for a carrier moving at high speed, the attitude of the carrier needs to be corrected in each axis direction quickly and in real time, and the time-sharing multi-axis measurement limits the attitude correction precision of the carrier.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to solve the technical problem that the prior art cannot realize simultaneous measurement of multi-axis rotating speeds.

In order to achieve the above object, the present invention provides a two-degree-of-freedom atomic interference gyroscope, comprising: the atomic preparation module, the atomic interference module and the atomic detection module;

the atom preparation module is used for preparing magnetically insensitive atomic groups and vertically throwing the prepared atomic groups upwards;

the atomic interference module is used for utilizing Raman light to act on the atomic groups when the atomic groups are thrown to an interference region, so that the atomic groups are split in two coaxial directions, the split beams in the two directions are reflected respectively, the split beams reflected in the two directions are superposed with the original atomic groups respectively, the reflected split beams in each direction and the superposed original atomic groups form atomic interference in the direction, and further the simultaneous interference of the atomic groups in the two directions is realized;

the atom detection module is used for detecting the atomic groups subjected to simultaneous interference in the two directions by using Raman light, respectively selecting the number of atoms in the preset momentum state in the two directions, and simultaneously determining the rotating speeds in the two directions according to the number of atoms in the preset momentum state in the two directions.

It is understood that, for those skilled in the art, the present invention can be extended to the three-axis simultaneous rotation speed measurement based on the two-axis simultaneous rotation speed measurement, so that the three-axis simultaneous rotation speed measurement also belongs to the present invention, and the present invention will not be described in detail.

In an alternative embodiment, the action process of the raman light on the atomic group in the atomic interference module is as follows:

when the atom group prepared by the atom preparation module moves upwards in a parabola manner to the first pi/2 pulse sequence of Raman light, two beams of Raman light in the x-axis direction and the y-axis direction act on the atom group at the same time, and beam splitting in the x-axis direction and the y-axis direction of the atom group is realized;

when the two split beams of atomic groups move upwards in a parabola mode to the first pi pulse sequence of Raman light, the two beams of Raman light in the x-axis direction and the y-axis direction act simultaneously, and the first reflection of the split beams of atomic groups in the x-axis direction and the split beams of atomic groups in the y-axis direction is achieved;

when the two first-reflected radicals move downwards in a parabolic mode to a second pi pulse sequence of the Raman light, the two beams of Raman light in the x-axis direction and the y-axis direction act simultaneously, and second reflection of the first-reflected radicals in the x-axis direction and the y-axis direction is achieved;

when the two secondary reflected radicals move downwards in a parabolic mode to the second pi/2 pulse sequence of the Raman light, the two beams of Raman light in the x-axis direction and the y-axis direction act simultaneously, and the combination of the secondary reflected radicals in the x-axis direction and the secondary reflected radicals in the y-axis direction is achieved.

In an alternative embodiment, the detection process of the raman light on the atomic group in the atom detection module is as follows:

utilizing Raman light in the x-axis direction to act on atom groups which are in parabolic descending motion in the x-axis direction, pumping momentum states of the atom groups to preset momentum states, collecting atoms in the preset momentum states in the x-axis direction, and determining the number of atoms in the preset momentum states in the x-axis direction;

and utilizing Raman light in the y-axis direction to act on the atomic groups which are in parabolic descending motion in the y-axis direction, pumping the momentum states of the atomic groups to preset momentum states, collecting atoms in the preset momentum states in the y-axis direction, and determining the number of atoms in the preset momentum states in the y-axis direction.

In an optional embodiment, the determining the rotation speeds in two directions according to the number of the preset momentum state atoms includes the following steps:

fitting according to the number of preset momentum state atoms in the x-axis direction to obtain interference fringes of the atoms in the x-axis direction, and calculating to obtain the probability P of the atoms in the x-axis direction_F＝2,xAnd F represents the total atomic angular momentum;

fitting according to the number of preset momentum state atoms in the y-axis direction to obtain interference fringes of the atoms in the y-axis direction, and calculating to obtain the probability P of the atoms in the y-axis direction_F＝2,y；

Determining atomic interference phase shift in the x-axis direction and the y-axis direction according to a relation between the probability and the phase shift in the x-axis direction and the y-axis direction:

wherein phi is_xPhase shift, phi, representing atomic interference in the x-axis direction_yPhase shift representing atomic interference in the y-axis direction;

determining the rotating speeds in the directions of the x axis and the y axis according to the relation between the phase shift in the directions of the x axis and the y axis and the rotating speed:

φ_x＝4k_eff,x(Ω_y×g_z)T³

φ_y＝4k_eff,y(Ω_x×g_z)T³

wherein k is_eff,xEffective wave vector, k, of Raman light in the x-axis direction_eff,yEffective wave vector, g, of Raman light in the y-axis direction_zRepresenting the acceleration of gravity, T representing the time that the atom takes from the first pi/2 pulse to the first pi pulse, omega_xDenotes the rotational speed in the x-axis direction, Ω_yThe rotation speed in the y-axis direction is indicated.

In an alternative embodiment, the atoms in the group of atoms in the magnetically insensitive state are | F ═ 1, m_F0 > atoms in the state, wherein F represents the total angular momentum of the atoms and m_FRepresenting the number of magnetic quanta.

In an alternative embodiment, the atom in the preset momentum state in the x-axis direction and the atom in the preset momentum state in the y-axis direction are two different momentum states in the F-2 state respectively

And

the atom (c) of (a).

In an alternative embodiment, the atomic preparation module cools the trapped atomic group by trapping light, which is chosen to be at | F ═ 1, m, when the gyroscope is in operation_F0 > atoms on state and is thrown vertically upwards.

Generally, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects:

the invention provides a two-degree-of-freedom atomic interference gyroscope which can realize simultaneous interference of two shafts and measurement of rotating speeds of the two shafts. The two-axis atomic interference gyroscope can more accurately measure the rotation postures of the two axes of the carrier in real time. In addition, compared with a uniaxial atomic interference gyroscope, under the same interference time T, the area of an interference loop is increased by 2 times, and the sampling rate is improved.

Compared with a single-axis atomic interference measurement gyroscope, the two-degree-of-freedom atomic interference gyroscope can be realized only by additionally adding a pair of Raman light configuration and Raman spectrum detection modules on the basis of the original gyroscope light path, the device is simple to realize, and the resource is recycled.

The invention provides a two-degree-of-freedom atomic interference gyroscope, which can realize simultaneous measurement of rotating speeds of two shafts, and can provide more accurate and stable positioning and enable navigation precision to be higher compared with a gyroscope for single-shaft atomic interference measurement.

Drawings

FIG. 1 is a schematic flow chart of a two-degree-of-freedom atomic interference gyroscope according to the present invention;

FIG. 2 is a schematic diagram of a two-degree-of-freedom atomic interference gyroscope apparatus according to the present invention;

FIG. 3 is a schematic diagram of a path of a two-degree-of-freedom atomic interference gyroscope according to the present invention;

FIG. 4 is a schematic diagram of a two-degree-of-freedom atomic interference gyroscope according to the present invention;

in all the drawings, the same reference numerals are used to denote the same elements or structures, where 100 is an atom preparation module, 101 is a first confinement light, 102 is a second confinement light, 103 is a third confinement light, 104 is a fourth confinement light, 105 is a fifth confinement light, 106 is a sixth confinement light, 200 is an atom detection module, 201 is a raman spectrum detection module, 202 and 204 constitute a pair of detection raman lights in the y-axis direction, 203 and 205 constitute a pair of detection raman lights in the x-axis direction, 208 is a fluorescence collection module, and 209 is a detection light; 300 is an atomic interference module, 301 and 303 constitute a pair of interfering raman lights in the y-axis direction, and 302 and 304 constitute a pair of interfering raman lights in the x-axis direction. 307 for y-direction raman light acting at the first pi/2 pulse and 308 for x-direction raman light acting at the first pi/2 pulse; 309 is the y-axis direction raman light acting at the first pi pulse, 310 is the x-axis direction raman light acting at the first pi pulse; 311 is the y-direction raman light acting at the second pi pulse, 312 is the x-direction raman light acting at the second pi pulse; 313 is the y-direction raman light acting at the second pi/2 pulse and 314 is the x-direction raman light acting at the second pi/2 pulse.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Aiming at the defects of the prior art, the invention provides a two-degree-of-freedom atomic interference gyroscope. The purpose is to achieve simultaneous interference in two directions and to achieve rotational speed measurement in both directions simultaneously. Aims to solve the defect problem of the uniaxial atomic interferometry scheme.

Compared with the existing single-axis atomic interference measurement technology, the atomic interference gyroscope technology for simultaneously measuring the rotating speeds of two shafts, which is conceived by the invention, can not only realize the simultaneous interference of two directions, but also simultaneously measure the rotating speeds of the two directions. The invention aims to realize the simultaneous interference in two directions and the rotation speed measurement; therefore, two independent Raman lights need to act simultaneously, namely Raman lights in the horizontal (x axis) direction and the horizontal (y axis) direction need to act simultaneously at the pi/2-pi/2 pulse of the Raman lights, atom beam splitting, reflection and convergence are realized, a two-degree-of-freedom atom interference gyroscope is formed simultaneously, and the simultaneous measurement of the rotating speed of two axes is completed.

The invention relates to the technical field of atomic interference measurement inertia, and provides a two-degree-of-freedom atomic interference gyroscope; the method comprises the following steps: the atomic preparation module, the atomic interference module and the atomic detection module; the atom preparation module is used for preparing atoms in a magnetic insensitive state; the atom interference module is used for realizing simultaneous interference in two directions; the atom detection module is used for detecting atoms in the same internal state and different momentum states after the interference is finished.

The atomic interference module is mainly used for realizing simultaneous interference in two directions, when atoms fly to an interference region, Raman light in the x-axis direction and the y-axis direction is simultaneously turned on at a pi/2-pi/2 four-pulse sequence of the Raman light, so that simultaneous interference of two axes is realized, and two-degree-of-freedom atomic interference gyroscopes are formed simultaneously.

The atom detection module of the present invention includes: the system comprises a Raman spectrum detection module and a fluorescence collection module, wherein the Raman spectrum detection module is mainly used for acting a beam of Raman light on interfered atomic groups and selecting the atomic groups in different momentum states; the fluorescence collection module is mainly used for collecting the Raman selected atoms, calculating the number of the atoms in the same internal state and different momentum states and further obtaining the rotating speed.

The two-degree-of-freedom atomic interference gyroscope is described in detail below with reference to the accompanying drawings and examples:

FIG. 1 is a schematic flow chart of a two-degree-of-freedom atomic interferometric gyroscope, in which first, in an atom preparation module 100, a radical reacts with six beams of confining light 101, 102, 103, 104, 105, 106, and then is cooled and confined to prepare | F ═ 1, m_FThe atomic group with the magnetic insensitivity state being 0 is larger than that of the atomic group with the magnetic insensitivity state, the prepared atomic group enters an interference module 300 through vertical upward-throwing atoms, Raman light in the x-axis direction and the y-axis direction acts in the atomic interference module 300 simultaneously to realize beam splitting, reflection and convergence of the atoms, two-axis simultaneous interference is completed to form a two-degree-of-freedom atomic interference gyroscope, the atomic group finally completed by interference freely falls to an atom detection module 200, and two different momentum states on the F2 state are detected by utilizing a Raman spectrum detection methodAnd

and then the number of atoms of the two shafts is obtained.

The following describes the interference and rotation speed measurement process of the two-degree-of-freedom atomic interference gyroscope in detail with reference to fig. 2 and 3.

Fig. 2 is a schematic diagram of an apparatus of a two-degree-of-freedom atomic interference gyroscope, and fig. 3 is a schematic diagram of a path of a two-degree-of-freedom atomic interference gyroscope, wherein fig. 3 is a detailed description of the atomic interference module 300 in fig. 2. Atoms are firstly cooled and trapped in a 3D-MOT (three-dimensional magneto-optical trap) atom preparation module 100 (the three-dimensional magneto-optical trap consists of six trapping lights 101, 102, 103, 104, 105 and 106), and then the atom groups obtained by cooling and trapping are vertically polished upwards and subjected to biaxial orientation to obtain the atom groups with the | F ═ 1, m ═ 1_FAfter the atoms in the state of 0 > fly to the atomic interference module 300, the raman light in the y-axis direction composed of 301 and 303 and the raman light in the x-axis direction composed of 302 and 304 act simultaneously, and thus two-axis simultaneous interference is realized.

The pair of raman lights consisting of 302 and 304 is a general description of the raman lights 308, 310, 312 and 314 in fig. 3, i.e. they are shown as the same meaning, except that 302 and 304 do not show raman lights with specific pulse segment action, and 308, 310, 312 and 314 respectively show pi/2, pi and pi/2 pulses of the x-axis raman lights consisting of 302 and 304. Similarly, the pair of raman lights 301 and 303 are generally depicted in fig. 3 as raman lights 307, 309, 311, 313, i.e., they are meant to be identical except that 301 and 303 do not represent specific pulsed raman lights, and 307, 309, 311, 313 represent pi/2, pi/2 pulses of the y-axis raman lights 301 and 303, respectively.

Specifically, the atomic interference gyroscope is completed by utilizing a Raman light action pi/2-pi/2 four-pulse sequence formed in the x-axis direction and the y-axis direction. In the interference module 300, two beams of Raman light 307 and 308 in the figure 3 are simultaneously acted at the first pi/2 pulse sequence to realize two-axis atom beam splitting; after time T, the atoms fly to the first pi pulse sequence, and 309 and 310 two beams of Raman light act on the first pi pulse simultaneously to realize atom reflection of two axes; and after free evolution of time T, the atoms fall to a second pi pulse, 311 and 312 Raman lights act on the second pi pulse at the same time to realize second reflection of the atoms on the two axes, and after free evolution of time T, the atoms fall to a second pi/2 pulse, 313 and 314 Raman lights act on the second pi/2 pulse at the same time to realize the combination of the atoms on the two axes, so that the whole process of simultaneous interference of the atoms on the two axes under the four-pulse configuration is completed. After the interference is completed, the atoms in the same internal state and different momentum states are detected, i.e., the atoms enter the atom detection module 200.

Specifically, in the atom probe module 200, a beam and 5S are first applied_1/2,F＝2→5P_3/2The F' 3 transition resonance clean light "blows away" the atoms in the F2 state, then in the raman spectrum detection module 201, a beam of y-axis direction raman light 202 and 204 is applied to the atomic group, the atomic group with narrow momentum distribution is selected, the F1 state atom is pumped to the F2 state, when the atom flies into the fluorescence collection module 208, a beam of detection light 209 is applied to obtain the momentum state in the F2 state as F2 state

The number of atoms of (c).

The method realizes that two shafts interfere simultaneously, so that the detection is needed twice, the interference process is completely the same as the previous process, and only in the detection process, the acted Raman light is different, namely, the atom enters the atom detection module 200 and acts on one beam and 5S_1/2,F＝2→5P_3/2The F' 3 transition resonance clean light "blows away" the atoms in the F2 state, then in the raman spectrum detection module 201, a beam of x-axis direction raman light 203 and 205 is applied to the atoms, the atoms with narrow momentum distribution are selected and the atoms in the F1 state are pumped to the F2 state, when the atoms fly into the fluorescence collection module 208, a beam of detection light 209 is applied to obtain the atoms in the F2 state with momentum state of F2

The number of atoms of (c).

Fig. 4 is a schematic diagram of a principle of a two-degree-of-freedom atomic interference gyroscope, in which a pair of raman lights in the x-axis direction and a pair of raman lights in the y-axis direction act on pi/2, pi, and pi/2, respectively, to achieve two-axis simultaneous interference and form the two-degree-of-freedom atomic interference gyroscope. The phase shifts of the two-degree-of-freedom atomic interferometric gyroscope can be expressed as:

φ_x＝4k_eff,x(Ω_y×g_z)T³(1)

φ_y＝4k_eff,y(Ω_x×g_z)T³(2)

wherein k is_eff,xEffective wave vector, k, of Raman light in the x-axis direction_eff,yEffective wave vector, g, of Raman light in the y-axis direction_zRepresenting the acceleration of gravity, T representing the interference time, omega_xDenotes the rotational speed in the x-axis direction, Ω_yThe rotation speed in the y-axis direction is indicated.

The corresponding probability expressions can be expressed as:

after the number of atoms is obtained by interference and detection according to the previous embodiment, interference fringes in the x and y axis directions are obtained by fitting according to the number of atoms, and the probability P is obtained by calculation_F＝2,xAnd P_F＝2,yThe phase shift phi is obtained by using the probability formulas (3) and (4)_xAnd phi_yThen, the rotation speed omega of the x and y axes is obtained according to the phase shift formulas (1) and (2)_xAnd Ω_yNamely, the rotating speeds of the two shafts are measured simultaneously.

It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.