CN107917706B - Gyro resonant cavity structure with atomic gas dispersion - Google Patents
Gyro resonant cavity structure with atomic gas dispersion Download PDFInfo
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- CN107917706B CN107917706B CN201711086065.2A CN201711086065A CN107917706B CN 107917706 B CN107917706 B CN 107917706B CN 201711086065 A CN201711086065 A CN 201711086065A CN 107917706 B CN107917706 B CN 107917706B
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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
- G01C19/64—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams
- G01C19/72—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams with counter-rotating light beams in a passive ring, e.g. fibre laser gyrometers
- G01C19/721—Details
Abstract
The invention relates to a gyro resonant cavity structure with atomic gas dispersion, which consists of a light source, three mirror cavities and a dispersion unit; the dispersion unit is arranged in the three-mirror cavity, and light of the light source is respectively incident into the three-mirror cavity and the dispersion unit; the light source consists of two lasers and an acousto-optic frequency shifter, wherein one laser provides a signal light source, and the other laser provides a pumping light source; the three-mirror cavity consists of two high-reflectivity lenses, a partially-reflective lens and PZT piezoelectric ceramics, the two high-reflectivity lenses and the partially-reflective lens form a three-mirror resonant cavity, and the PZT piezoelectric ceramics is connected with the high-reflectivity lens and is used for adjusting the cavity length of the three-mirror cavity; the dispersion unit consists of an atomic gas, a magnetic shield, a glass bulb and a temperature control module, wherein the atomic gas is encapsulated in the glass bulb, the magnetic shield is wrapped outside the glass bulb, and the temperature control module is used for heating the atomic gas of the glass bulb. The invention solves the problem of low sensitivity of the resonant optical gyroscope.
Description
Technical Field
The invention relates to a resonant cavity structure of a high-sensitivity resonant optical gyroscope, in particular to a gyroscope resonant cavity structure with atomic gas dispersion, and belongs to the technical field of resonant optical gyroscopes.
Background
The gyroscope is a key device for realizing attitude control and inertial navigation of a controlled object as a sensor for accurately determining the azimuth and the angular speed of a moving object, is an inertial navigation instrument widely applied to modern aviation, aerospace, navigation and national defense industries, and has very important strategic significance for high-end technical development of the national industry, national defense and the like. According to the principle of measuring angular velocity, gyroscopes can be classified into mechanical gyroscopes, optical gyroscopes, and atomic gyroscopes. Gyroscopic sensitivity and accuracy can be further divided into navigation level, tactical level, and rate level gyros. Generally speaking, gyros with different precisions have different application fields, and low-precision and medium-low precision gyros can be applied to the fields of vehicle automatic driving, antenna stabilization, robot control, well drilling, short-range missile and the like; the medium-precision gyroscope can be applied to tactical missiles, unmanned planes, tank aiming and the like; the medium and high precision gyroscope can be applied to aviation attitude control, satellite positioning and attitude control, medium and long distance missiles and the like; the high-precision and inertial navigation level gyroscope can be applied to precise aerospace navigation, underwater submarine, precise aiming, north-seeking and the like.
The gyroscope is an inertial sensor for measuring angular velocity, is known as the brain of flight control, has more urgent need of high precision and miniaturization and integration, and the high precision and miniaturization of the gyroscope are two major trends of development.
Disclosure of Invention
1. The purpose is as follows: the invention aims to provide a gyro resonant cavity structure with atomic gas dispersion aiming at the problem of low sensitivity of a resonant optical gyro.
2. The technical scheme is as follows:
the resonant optical gyroscope generally comprises a laser light source, an annular resonant cavity, a coupler, a photoelectric detector, a photoelectric modulation and demodulation system and the like, wherein two beams of light which enters the resonant cavity from the laser light source clockwise and anticlockwise enter the resonant cavity from the coupler for resonance, and when the resonant cavity rotates, the frequency difference of the two beams of light is detected through the photoelectric detector and a photoelectric demodulation signal, so that the rotation angular speed of the gyroscope is measured.
The invention relates to a gyro resonant cavity structure with atomic gas dispersion, which consists of a light source, a three-mirror cavity and a dispersion unit (as shown in figure 1); the relation between them is that the dispersion unit is placed in the three mirror cavity, and the light of the light source is respectively incident into the three mirror cavity and the dispersion unit.
The light source consists of two lasers and an acousto-optic frequency shifter; one laser provides a signal light source, and the other laser provides a pumping light source; the laser for providing the signal light source is split by a beam splitter, one beam of light enters the acousto-optic frequency shifter for frequency shift, then is guided into the dispersion unit by a light guide mirror and a first polarization beam splitter and then is guided out by a second polarization beam splitter, and the other beam of light enters the three mirror cavities, passes through the first polarization beam splitter, enters the dispersion unit, then passes through the second polarization beam splitter and resonates in the three mirror cavities. The laser providing the pump light source is guided into the dispersion unit by the first polarization beam splitter and then guided out by the second polarization beam splitter.
The three-mirror cavity consists of two high-reflectivity mirrors, a partially-reflective mirror and PZT piezoelectric ceramics; the relationship between the two high-reflectivity lens and the partially-reflective lens is that the two high-reflectivity lens and the partially-reflective lens form a three-mirror resonant cavity, and the PZT piezoelectric ceramic is connected with the high-reflectivity lens for adjusting the cavity length of the three-mirror resonant cavity. A cube rubidium atom bubble with the side length of 1.5cm is locked at the temperature of 60 ℃ through PID temperature control, and then the cube rubidium atom bubble is placed into a three-mirror cavity with the cavity length of 30cm, two high-reflectivity lenses are concave mirrors, one partially-reflective lens is a plane mirror, the reflectivity of the plane mirror is 0.999, and the plane mirror is used as a light wave output mirror.
The dispersion unit consists of an atomic gas, a magnetic shield, a glass bulb and a temperature control module (as shown in figure 2); the relationship between the atomic gas and the magnetic shielding material is that the atomic gas is encapsulated in the glass bulb, the magnetic shielding material is wrapped outside the glass bulb, and the temperature control module is used for heating the atomic gas of the glass bulb.
Wherein the atomic gas is alkali metal gas.
Wherein the atomic gas level structure adopts rubidium (b)87Three-level structure of Rb) D1 line consisting of two ground states 52S1/2F＝1，52S1/2F2 and an excited state 52P1/2The formed inverted V-shaped structure. A strong driving light field acts on the energy level 52S1/2F2 and 52P1/2Splitting the excited state energy level by adjusting the pump light (5)2S1/2F＝1，52P1/2) Is caused to act at energy level 52S1/2F is 1 and 52P1/2The optical field of the probe above is at anomalous dispersion.
3. The advantages and the effects are as follows:
the invention relates to a gyro resonant cavity structure with atomic gas dispersion, wherein signal probe light enters atomic gas of a dispersion unit after being emitted into a three-mirror cavity. The probe light signal light is in an anomalous dispersion state through the adjustment of the pump light, and the anomalous dispersion can increase the frequency shift amount of the resonance mode of the signal probe light, so that the frequency shift amount of the signal probe light caused by the Sagnac effect is increased, and the sensitivity of the resonance type gyroscope is increased by 1-2 orders of magnitude.
Drawings
FIG. 1 is a schematic diagram of a resonant cavity of an atomic gas dispersion gyroscope according to the present invention.
Fig. 2 is a schematic diagram of the dispersive unit shown in fig. 1.
FIG. 3 is a graph showing the comparison between the sensitivity of the atomic gas dispersion gyroscope of the present invention and the sensitivity of the conventional gyroscope.
The numbers in the figures are specified below:
1-laser for providing signal light source, 2-laser for providing pumping light source, 3-acousto-optic frequency shifter, 4-dispersion unit, 5-beam splitter, 6-light guide mirror, 7-first polarization beam splitter, 8-second polarization beam splitter, 9-high reflectivity lens, 10-partial reflection lens, 11-PZT piezoelectric ceramic, 12-atomic gas, 13-magnetic shield, 14-glass bulb and 15-temperature control module
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, the present invention is an improved gyro resonant cavity structure with atomic gas dispersion, which is an improved ring resonant cavity of the existing resonant gyro, and the dispersion unit is added into a three-mirror cavity to form an improved gyro resonant cavity; the invention is composed of a light source, three mirror cavities and a dispersion unit 4; the relation between them is that the dispersion unit is placed in the three mirror cavity, and the light of the light source is respectively incident into the three mirror cavity and the dispersion unit.
The light source consists of two lasers and an acousto-optic frequency shifter 3; a laser 1 for providing a signal light source is split by a beam splitter 5, one beam of light enters an acousto-optic frequency shifter 3, is guided into a dispersion unit 4 by a light guide mirror 6 and a first polarization beam splitter 7 after frequency shifting, and is guided out by a second polarization beam splitter 8, and the other beam of light enters a three-mirror cavity, passes through the first polarization beam splitter 7, is incident into the dispersion unit 4, passes through the second polarization beam splitter 8, and resonates in the three-mirror cavity. A laser 2 for providing a pump light source is guided into a dispersion unit 4 by a first polarization beam splitter 7 and then guided out by a second polarization beam splitter 8.
The three-mirror cavity consists of two high-reflectivity mirrors 9, a partially-reflective mirror 10 and PZT piezoelectric ceramics 11; the relationship between the two high-reflectivity mirror plates 9 and a partially-reflective mirror plate 10 is that two high-reflectivity mirror plates 9 and a partially-reflective mirror plate 10 form a three-mirror resonant cavity, and the PZT piezoelectric ceramic 11 is connected with one high-reflectivity mirror plate 9 and is used for adjusting the cavity length of the three-mirror resonant cavity. A cube rubidium atom bubble with the side length of 1.5cm is locked at the temperature of 60 ℃ through PID temperature control, and then the cube rubidium atom bubble is placed into a three-mirror cavity with the cavity length of 30cm, two high-reflectivity lenses 9 are two concave mirrors, one partially-reflective lens 10 is a plane mirror, the reflectivity of the plane mirror is 0.999, and the plane mirror serves as a light wave output mirror.
The dispersion unit 4 is composed of atomic gas 12, a magnetic shield 13, a glass bulb 14 and a temperature control module 15 (as shown in FIG. 2); the relationship between them is that the atomic gas 12 is enclosed in a glass bulb 14, a magnetic shield 13 is wrapped outside the glass bulb 14, and a temperature control module 15 is used for heating the atomic gas of the glass bulb. The atomic gas level structure adopts rubidium (b)87Three-level structure of Rb) D1 line consisting of two ground states 52S1/2F＝1，52S1/2F2 and an excited state 52P1/2The formed inverted V-shaped structure. A strong driving light field acts on the energy level 52S1/2F2 and 52P1/2Splitting the excited state energy level by adjusting the pump light (5)2S1/2F＝1，52P1/2) Is caused to act at energy level 52S1/2F is 1 and 52P1/2The optical field of the probe above is at anomalous dispersion.
The invention is completely suitable for the existing laser gyro, is improved on the basis of the existing laser gyro, and can improve the sensitivity of the laser gyro by one order of magnitude at low rotating speed (as shown in figure 3).
Claims (1)
1. The utility model provides a top resonant cavity structure of atomic gas dispersion which characterized in that: the device consists of a light source, three mirror cavities and a dispersion unit; the relation between the three lens cavities is that the dispersion unit is arranged in the three lens cavities, and light of the light source respectively enters the three lens cavities and the dispersion unit;
the light source consists of two lasers and an acousto-optic frequency shifter; one laser provides a signal light source, and the other laser provides a pumping light source; the laser device is used for providing a signal light source, after light is split by a beam splitter, one beam of light enters an acousto-optic frequency shifter for frequency shift, is guided into a dispersion unit by a light guide mirror and a first polarization beam splitter and is guided out by a second polarization beam splitter, and the other beam of light enters a three-mirror cavity, passes through the first polarization beam splitter, enters the dispersion unit, passes through the second polarization beam splitter and resonates in the three-mirror cavity; a laser for providing a pump light source, which is guided into the dispersion unit by the first polarization beam splitter and then guided out by the second polarization beam splitter;
the three-mirror cavity consists of two high-reflectivity mirrors, a partially-reflective mirror and PZT piezoelectric ceramics; the relationship between the two high-reflectivity lenses and a partially-reflective lens forms a three-mirror resonant cavity, and the PZT piezoelectric ceramic is connected with the high-reflectivity lens and used for adjusting the cavity length of the three-mirror resonant cavity; the temperature of rubidium atom bubbles of a cube with the side length of 1.5cm is locked at 60 ℃ through PID temperature control, and then the rubidium atom bubbles are placed into a three-mirror cavity with the cavity length of 30cm, two high-reflectivity lenses are concave mirrors, one partially-reflective lens is a plane mirror, the reflectivity of the plane mirror is 0.999, and the two partially-reflective lenses are used as light wave output mirrors;
the dispersion unit consists of an atom gas, a magnetic shield, a glass bulb and a temperature control module; the relationship between the glass bulb and the temperature control module is that the atomic gas is encapsulated in the glass bulb, the magnetic shield is wrapped outside the glass bulb, and the temperature control module is used for heating the atomic gas in the glass bulb;
wherein the atomic gas is alkali metal gas;
wherein the atomic gas level structure adopts rubidium87RbD1 line consisting of two ground states 52S1/2F＝1，52S1/2F2 and an excited state 52P1/2The formed inverted V-shaped structure; a strong driving light field acts on the energy level 52S1/2F2 and 52P1/2Splitting the excited state energy level, and adjusting the intensity of the pump light to act on the energy level 52S1/2F is 1 and 52P1/2The optical field of the probe above is at anomalous dispersion.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1374504A (en) * | 2002-04-15 | 2002-10-16 | 清华大学 | Semiconductor side pumped solid laser gyroscope and its electrooptical modulation method |
| CN102053007A (en) * | 2009-10-29 | 2011-05-11 | 龙兴武 | Absolute measuring method for intramembranous loss parameter of high-reflectivity membrane |
| CN102709802A (en) * | 2012-06-05 | 2012-10-03 | 中国科学院武汉物理与数学研究所 | Excited state atom filter receiving device for pumping laser atom frequency stabilization |
| CN104075703A (en) * | 2014-07-23 | 2014-10-01 | 中北大学 | Resonant optical gyroscope based on high-K fluoride resonant cavity |
| CN105277188A (en) * | 2015-08-28 | 2016-01-27 | 华东师范大学 | Sagnac angular velocity measurement system and method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6618151B2 (en) * | 2001-01-17 | 2003-09-09 | Honeywell International Inc. | Ring laser gyroscope with offset aperture |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1374504A (en) * | 2002-04-15 | 2002-10-16 | 清华大学 | Semiconductor side pumped solid laser gyroscope and its electrooptical modulation method |
| CN102053007A (en) * | 2009-10-29 | 2011-05-11 | 龙兴武 | Absolute measuring method for intramembranous loss parameter of high-reflectivity membrane |
| CN102709802A (en) * | 2012-06-05 | 2012-10-03 | 中国科学院武汉物理与数学研究所 | Excited state atom filter receiving device for pumping laser atom frequency stabilization |
| CN104075703A (en) * | 2014-07-23 | 2014-10-01 | 中北大学 | Resonant optical gyroscope based on high-K fluoride resonant cavity |
| CN105277188A (en) * | 2015-08-28 | 2016-01-27 | 华东师范大学 | Sagnac angular velocity measurement system and method |
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