阅读说明：本技术 核磁共振陀螺及探测方法 (Magnetic resonance gyroscope and detection method ) 是由 刘元正 雷兴 蒋樱子 李俊 胡强 郭卫华 于 2019-08-20 设计创作，主要内容包括：本发明提供一种核磁共振陀螺及核磁共振陀螺探测方法,该核磁共振陀螺探测方法通过监测抽运光光强的变化,监控并调节原子气室的温度,通过监测共振光强变化,实现对陀螺核磁共振点的监测,通过对探测光的直流部分变化的监测实现对陀螺信号的探测。本发明的核磁共振陀螺克服现有核磁共振陀螺方案中应用热敏传感器件导致系统难以小心化以及核磁共振陀螺工作点确定时存在误差的问题。(The present invention provides a kind of magnetic resonance gyroscope and magnetic resonance gyroscope detection method, the variation that the magnetic resonance gyroscope detection method passes through monitoring Pump intensity, monitor and adjust the temperature of atomic air chamber, pass through monitoring resonance light intensity variation, it realizes the monitoring to gyro nuclear magnetic resonance point, the detection to gyro signal is realized by the monitoring of the direct current component variation to detection light.There are errors when magnetic resonance gyroscope of the invention overcomes the problems, such as to cause system to be difficult to carefulization using heat-sensitive sensor device in existing magnetic resonance gyroscope scheme and magnetic resonance gyroscope operating point determines.)

1. magnetic resonance gyroscope, which is characterized in that including detection optical path, resonance optical path, pumping optical path, magnetic shielding system (20), Atomic air chamber (22), without magnetic heating system (23), field system, four detectors, wherein the no magnetic heating system (19) sets It sets on atomic air chamber (18) surface, the two is arranged in field system, and is integrally coated by magnetic shielding system (17), the detection Optical path passes through field system and atomic air chamber (22) outside from magnetic shielding system (17) and forms the two of difference detecting system by two A detector is received, and the resonance optical path, pumping light path coaxial simultaneously pass through magnetic shielding system with detection optical path orthogonal vertical (17), it field system and atomic air chamber (22) and is received respectively by respective detector.

2. magnetic resonance gyroscope according to claim 1, which is characterized in that the pumping optical path include pump light source (2), Collimation lens (4), transflection mirror (7), beam splitter (15), optical filter (16) and detector, the pumping that the pump light source (2) issues Fortune light is circularly polarized light.

3. magnetic resonance gyroscope according to claim 1, which is characterized in that the resonance optical path and detection optical routing are same Light source obtains by beam splitter (5) beam splitting or is independent light beams provided by two different light sources.

4. magnetic resonance gyroscope according to claim 1, which is characterized in that the resonance optical path includes sequentially setting along optical path The light source (1) set, collimation lens (3), beam splitter (5), reflecting mirror (6), transflection mirror (7), beam splitter (15), optical filter (18) with And detector, wherein transflection mirror (7) and detector are located at magnetic shielding system (20) two sides.

5. magnetic resonance gyroscope according to claim 1, which is characterized in that the detection optical path includes sequentially setting along optical path Light source (1), collimation lens (3), beam splitter (5), reflecting mirror (21) and the difference detecting system set, the reflecting mirror (21) and spy It surveys device and is located at magnetic shielding system (20) two sides.

6. magnetic resonance gyroscope according to claim 1, which is characterized in that the optical filter (16) filters out resonance light, and Pass through pumping light；Optical filter (18) filters out pumping light, and passes through resonance light.

7. a kind of magnetic resonance gyroscope detection method, which is characterized in that by monitoring the variation of Pump intensity, monitor and adjust The temperature of atomic air chamber realizes the monitoring to gyro nuclear magnetic resonance point, by detection light by monitoring resonance light intensity variation The detection to gyro signal is realized in the monitoring of AC portion pair value variation.

8. magnetic resonance gyroscope detection method according to claim 7, which is characterized in that the resonance light intensity is direct current change Change, when the resonance light intensity minimum that detector (19) detects, gyro reaches nuclear magnetic resonance operating point.

9. magnetic resonance gyroscope detection method according to claim 7, which is characterized in that when Pump intensity is excessive or mistake It is small, the input current of heating system is controlled, atomic air chamber temperature is adjusted.

Technical field

The invention belongs to inertial navigation fields, and in particular to a kind of atom magnetic resonance gyroscope (Nuclear Magnetic Resonance gyroscope, or NMRG) and detection method.

Background technique

Magnetic resonance gyroscope concept originates from the 1960s, since its miniaturization, high-precision advantage are cured in recent years By the attention of educational circles.General magnetic resonance gyroscope mainly includes field system, light-source system, heating system and gas chamber system And signal detection system.Wherein gas chamber system is the core component of gyro system.

It include alkali metal atom, inert gas, buffer gas atoms steam and several gas to be quenched in atomic air chamber system Body.Main working process is the alkali metal atom that polarized by optical pumping, is acted on through overspin collision exchange, by alkali metal atom Polarized state pass to intert-gas atoms, by the Larmor precession frequency displacement of intert-gas atoms obtain carrier rotation letter Breath.Gas is being quenched among these for promoting alkali metal atom polarizability, and buffer gas then with reduce alkali metal atom and The probability of the rebuffed depolarization of intert-gas atoms, and then promote gyro signal.

The basic principle of magnetic resonance gyroscope are as follows:

Intert-gas atoms core has magnetic moment, places it in magnetostatic field B0, nuclear moments can be drawn around magnetic field More's precession:

ω_L=γ B₀ (1)

Wherein it is atom magnetic rotaion comparison, is Larmor precession frequency.When carrier is rotated around magnetostatic field B0, what actual observation arrived Precession frequency are as follows:

ω'_L=γ B₀-ω_R (2)

Larmor precession frequency is the intrinsic feature of atomic nucleus, is stablized when atomic species and magnetostatic field determine constant Physical quantity, when by measurement carrier rotation, the angle of rotation that system can be obtained in changes of the Larmor precession frequency of actual measurement is fast Degree, as shown in formula (2).

It is general there are intert-gas atoms macroscopic magnetization is appropriate, generally use the shape of spin exohange collision Formula, i.e., first with alkali metal atom D1 line (rubidium: 795nm, caesium: 895nm) irradiated atoms gas chamber, make alkali metal atom pumping into Change, the polarization of alkali metal is then passed to by inert gas (129Xe, 131Xe etc.) by spin exohange collision, so that system goes out Existing inert gas macroscopic moment, magnetic resonance gyroscope is exactly the change of the Larmor precession frequency by inert gas in the carrier Obtain carrier rotation information.

At room temperature, alkali metal atom is solid-state, alkali metal atom need to be become gaseous state, alkali gold first with heating system It is directly related with system operating temperatures to belong to vapor atoms number density, it is therefore desirable to control operating temperature, common method It is to be measured using thermistor temp Sensitive Apparatus to gas chamber temperature, measuring signal is fed back into heating system and realizes work Temperature spot is stablized, this method needs for temperature sensor to be placed directly against plenum surface, or is attached to and directly contacts with gas chamber On heat-transfer device.These schemes will limit the size of gas chamber light pass surface, limit further decreasing for gas chamber or even gyro volume.

When gas chamber temperature is stabilized to preset operating temperature, adjustment exchange oscillating magnetic field frequency and static magnetic field width Value is applying alkali metal D2 line as detection light perpendicular to magnetostatic field and exchange oscillating magnetic field direction, and detection light passes through atom Gas chamber and a series of subsequent optical devices occur on light intensity signal and apply the exchange light intensity for exchanging oscillating magnetic field with frequency Variation.When alternating-current magnitude maximum, inert gas reaches nuclear magnetic resonance state.When carrier starts turning, alternating-current magnitude becomes smaller, and leads to Crossing adjustment oscillating magnetic field frequency makes inert gas return maximum value, and the knots modification of oscillating magnetic field frequency is then carrier speed.In During seeking AC amplitude maximum value, the amplitude of AC signal changes the AC modulation intrinsic with light intensity signal and mixes, and limits The determination to amplitude maximum has been made, the accuracy of inert gas nuclear magnetic resonance state is reduced, limitation Gyro Precision is promoted.

Summary of the invention

Technology of the invention solves the problems, such as: overcoming in existing magnetic resonance gyroscope scheme causes using heat-sensitive sensor device System is difficult to carefulization and when magnetic resonance gyroscope operating point determines has error, proposes a kind of novel nuclear magnetic resonance Gyro scheme, the program is small in size, determines that gyro nuclear magnetic resonance operating point, operating point are more accurate with DC form.

Above-mentioned purpose of the invention is achieved by following technical proposals: magnetic resonance gyroscope comprising detection optical path, Resonate optical path, pumping optical path, magnetic shielding system 20, atomic air chamber 22, without magnetic heating system 23, field system, four detectors, Wherein, the no setting of magnetic heating system 19 is on 18 surface of atomic air chamber, and the two is arranged in field system, and integrally by magnetic screen System 17 is coated, and the detection optical path passes through field system and atomic air chamber 22 outside magnetic shielding system 17 and formed by two Two detectors of difference detecting system are received, the resonance optical path, pumping light path coaxial and with detection optical path orthogonal vertical It is received respectively across magnetic shielding system 17, field system and atomic air chamber 22 and by respective detector.

The pumping optical path includes pump light source 2, collimation lens 4, transflection mirror 7, beam splitter 15, optical filter 16 and detection Device, the pumping light that the pump light source 2 issues are circularly polarized light.

The resonance optical path obtains by 5 beam splitting of beam splitter with detection optical routing same light source or is two different light source institutes The independent light beams of offer.

The resonance optical path includes the light source 1 being sequentially arranged along optical path, collimation lens 3, beam splitter 5, reflecting mirror 6, transflection Mirror 7, beam splitter 15, optical filter 18 and detector, wherein transflection mirror 7 and detector are located at 20 two sides of magnetic shielding system.

The detection optical path includes the light source 1 being sequentially arranged along optical path, collimation lens 3, beam splitter 5, reflecting mirror 21 and poor Divide detection system, the reflecting mirror 21 and detector are located at 20 two sides of magnetic shielding system.

The optical filter 16 filters out resonance light, and passes through pumping light；Optical filter 18 filters out pumping light, and passes through resonance light.

A kind of magnetic resonance gyroscope detection method monitors by the variation of monitoring Pump intensity and adjusts atom gas The temperature of room realizes the monitoring to gyro nuclear magnetic resonance point, passes through the exchange portion to detection light by monitoring resonance light intensity variation Divide detection of the monitoring realization of secondary value variation to gyro signal.

The resonance light intensity is direct current variation, and when the resonance light intensity minimum that detector 19 detects, gyro reaches nuclear-magnetism Resonant operation point.

When Pump intensity is excessive or too small, the input current of heating system is controlled, atomic air chamber temperature is adjusted.

Beneficial effects of the present invention:

The present invention has the advantages that compared with prior art:

1) present invention changes the standard controlled as gyro operating temperature using Pump intensity, with conventional temperature sensor Part scheme is compared, and except the limitation for eliminating temperature sensor and minimizing to gyro, measurement result is more direct；

2) present invention injects a branch of linear polarization detection light and determining inert gas nuclear magnetic resonance using in pumping light direction The operating point of phenomenon, eliminates the influence of traditional scheme AC portion, and operating point determination is more accurate；

3) present invention proposes that filter plate is placed for filtering out pumping light and detecting the influence between light in end before the detectors；Filter Wave plate slant setting avoids scattering light from reentering gas chamber limitation Gyro Precision promotion.

Detailed description of the invention

Fig. 1 is magnetic resonance gyroscope overall plan；

Relationship of the Fig. 2 between atomic cell alkali metal number density and gas chamber temperature；

Fig. 3 is the variation of nuclear magnetic resonance area inert gas all directions macroscopic moment；

Component digital representation in figure: 1- probe source, 2- pump light source, the first collimation lens of 3-, 4- second are collimated Lens, the first beam splitter of 5-, the first reflecting mirror of 6-, 7- transflection mirror, the magnetostatic field coil group of 8-, 9- oscillating magnetic field coil group, 10- Polarization splitting prism, the 11, first optical filter, the second optical filter of 12-, the first detector of 13-, the second detector of 14-, 15- beam splitting Prism, 16- third optical filter, 17- third detector, the 4th optical filter of 18-, the 4th detector of 19-, 20- magnetic shielding system, The second reflecting mirror of 21-, 22- atomic air chamber, 23- are without magnetic heating system.

Specific embodiment

In conjunction with attached drawing, technical solution is described in detail:

Magnetic resonance gyroscope scheme block diagram as shown in Figure 1, involved magnetic resonance gyroscope scheme include detection light path part, Pump light path part, photodetecting part, atomic air chamber system, field system, no magnetic heating system and magnetic shielding system.

Magnetic resonance gyroscope scheme of the present invention includes probe source 1, pump light source 2, magnetic shielding system 20, atomic air chamber 22, without magnetic heating system 23, field system 8,9 and detection system 13,14,17,19.

By atomic air chamber 22, without magnetic heating system 23, field system 8,9 is placed in magnetic shielding system, wherein atomic air chamber 22 are placed between no magnetic heating system 23, and magnetostatic field coil group 8,9 Symmetric Orthogonal of oscillator coil group are placed on the outside of heating system, visit Examining system 13,14,17,19 is respectively intended to detection pumping optical signal and detects optical signal, and placing it in periphery is to inhibit its work As when the interference to gyro signal of the magnetic field that generates.

The circular polarization pumping light (alkali metal D1 line) that involved pump light source 2 generates is through the second collimation lens 4 after through transflection Shielding harness hole is passed through after mirror 7 to be irradiated on gas chamber 22, realizes the pumping polarization of alkali metal atom in gas chamber.Pumping light according to It is secondary pass through gas chamber 22, without magnetic heating system 23, magnetic shielding system 20 after, by beam splitter prism 15, after third optical filter 16 It is received by third detector 17.Relationship according to Lambert-Bill law, between gas chamber output intensity and input light intensity are as follows:

I_out=I_ine^-N(T)σ(ν)L (3)

N (T) is the density of alkali metal atom steam in atomic air chamber in formula, is the absorption cross-section of alkali metal atom, works as gas It is stationary value when room inflation parameter is fixed and pump light wavelength is fixed, L is gas chamber side length.Formula (3) display, output intensity It is related to alkali metal atom number density in gas chamber, and alkali metal atom number density is directly related with gas chamber operating temperature, specifically Relationship is as shown in Figure 2.It therefore can be control of 17 signal of the third detector realization to atomic air chamber operating temperature by detection；The Three optical filters 16 are tilting for avoiding scattering light from reentering gas chamber interference pumping effect.

The linear polarization detection light (alkali metal D2 line) that involved probe source 2 generates is after the first collimation lens 3 by first Beam splitter 5 divides for two parts, and a part is overlapped after the first reflecting mirror 6 and transflection mirror 7 with pumping light, successively by magnetic cup It covers cover 20, be later that the reflection of beam splitter prism 15 is detected by the 4th filter plate 18 by the 4th without magnetic heating system 23, atomic air chamber Device 19 detects.Not only it will appear inert gas macroscopic view perpendicular to 8 direction of magnetostatic field as shown in figure 3, generating in nuclear magnetic resonance effects Precessing magnetic moment also will appear the change of inert gas macroscopic moment in 8 direction of magnetostatic field.It is magnetostatic compared with the variation of lateral magnetic moment Without alternation distracter, the selection of gyro nuclear magnetic resonance operating point is more accurate for the variation of 8 direction macroscopic moments of field.

Detect light and gas chamber be reflected into through the second reflecting mirror 21 by another part of 5 beam splitting of the first beam splitter, the light beam with The two-beam for being previously entered gas chamber is mutually perpendicular to intersect, and intersection point is located at the center of atomic air chamber 22, which passes through gas Equivalent two parts are divided by polarization splitting prism 10 after room and magnetic shielding system, pass through the first optical filter 11 respectively, second It is received after optical filter 12 by the first detector 13, the second detector 14, then detection is handled using difference channel.The One optical filter 11,12 slant setting of the second optical filter avoid scattering light from reentering gas chamber limitation Gyro Precision promotion.

Involved optical filter 11,12,16,18 is used to eliminate pumping light and detects the crosstalk between light.First optical filter 11, the Two optical filters 12 are used to filter out alkali metal D1 line and guarantee the pure of detectable signal, and third optical filter 16 is for filtering out alkali metal D2 line Realize the detection to gas chamber operating temperature, the 4th optical filter 18 realizes inert gas nuclear magnetic resonance work for filtering out alkali metal D1 line Make the determination of point.The involved equal slant setting of optical filter avoids scattering light from reentering gas chamber limitation Gyro Precision promotion.

The present invention plants magnetic resonance gyroscope detection method, by the variation of monitoring Pump intensity, monitors and adjusts original The temperature of sub- gas chamber realizes the monitoring to gyro nuclear magnetic resonance point, passes through the friendship to detection light by monitoring resonance light intensity variation The detection to gyro signal is realized in the monitoring of stream part amplitude variation.

Process is as follows:

According to Fig. 1) shown in assemble gyro, light probe source 1, pump light source 2, wherein probe source works in alkali metal D2 line, and pump light source works in alkali metal D1 line.Electric current is applied to no magnetic heating system 23,22 temperature of gas chamber increases, and such as schemes 2) shown in, alkali metal atom number density is increase accordingly in gas chamber, and the Pump intensity as detected by detector 17 then gradually drops Low, when Pump intensity is reduced to the I0 originally set, temperature controls closed-loop system and starts to work, by adjusting nothing is applied to Magnetic heating system realizes that Pump intensity is stablized to I0, that is, realizes and stablize gyro operating temperature to specific T0, guarantees Gyro operating temperature point is stablized.

After stablizing to gyro operating temperature point, magnetostatic field 8 and swaying magnetic field 9 are opened, adjusts oscillating magnetic flux field frequency Rate, then there is light intensity variation corresponding with static magnetic field direction magnetic moment variation in Fig. 3) in detector 19, when output intensity minimum When, gyro realizes that nuclear magnetic resonance and gyro arrive at magnetic field operating point.

After gyro realizes that operating temperature point, magnetic field point are stablized, when carrier rotates, measured obtained indifferent gas Body Larmor precession frequency can then change, and the change by measuring Larmor precession frequency can sensitive gyroscope speed information.

The variation of this method Pump intensity replaces thermistor to realize that gyro operating temperature point is stablized and eliminates temperature-sensitive electricity The limitation to gas chamber size is put in resistance, it is easy to accomplish miniaturization；Apply detection light in static magnetic field direction to realize gyro nuclear-magnetism Resonant operation point is stablized, and eliminates detectable signal alternation and finds caused interference to magnetic resonance gyroscope point.Method is easily achieved, There is very high application prospect.