CN110426027A - A kind of fibre optic gyroscope and its method of the realization multi-turn detour based on magneto-optic shutter - Google Patents
A kind of fibre optic gyroscope and its method of the realization multi-turn detour based on magneto-optic shutter Download PDFInfo
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- 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
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Abstract
The fibre optic gyroscope and its method that the realization multi-turn based on magneto-optic shutter that the invention discloses a kind of detours.The light that light source issues enters Y waveguide by coupler, Y waveguide be polarized effect under, s polarised light reaches at Faraday rotator by polarization beam apparatus.After the s polarised light of arrival being rotated by 90 degrees according to the magnetic field that current coil generates become p-polarization light.Due to birefringence effect, the two beam p-polarization lights for returning to polarization beam apparatus will not return in Y waveguide along original optical path, but enters in fiber optic loop and detour, the time that electric current by controlling magnetic field maintains light to enclose around fiber optic loop one, electric current is closed later, so that recycling detour in Fibre Optical Sensor ring along inverse two beam p-polarization lights；Current field is added after detour multi-turn, so that two beam p-polarization lights become s polarised light by Faraday rotator, s light returns to Y waveguide by polarization beam apparatus.The present invention realizes that light multi-turn circulation in fiber optic loop detours, and can get more highly sensitive optical fibre gyro.
Description
Technical field
The present invention relates to fibre optic gyroscope more particularly to a kind of optical fibre gyros that the realization multi-turn based on magneto-optic shutter detours
Instrument and its method.
Background technique
Gyroscope is the mainstream device in inertia field, and presently the most popular is the optical fibre gyro based on Sagnac effect
Instrument, it has the characteristics that structure is simple, the service life is long, precision is high relative to traditional mechanical gyroes instrument.Nowadays fibre optic gyroscope
Designing technique tended to be mature, next will be improved towards precision, sensitivity and stability etc. is improved.
Traditional interferometric fiber optic gyroscope, the two-beam exported from Y waveguide, respectively by propagating into clockwise and anticlockwise
In fiber optic loop, angular velocity of rotation is calculated by calculating Sagnac phase shift.Quadrupole is usually taken in fiber optic loop in this structure
Symmetrical winding or bipolar symmetrical winding, can reduce the brings such as extraneous temperature, vibration in this way influences, and optical fiber ring length is longer
Optical fiber gyroscope precision can be improved, but also bring along biggish parasitic phase noise, be easy the interference by external environment.
Summary of the invention
The purpose of the present invention is overcome the deficiencies in the prior art, under conditions of not changing measurement accuracy, reduce optical fiber and pass
Feel ring length, and thus reduce the irreplaceable error and noise jamming of fiber optic loop, a kind of reality based on magneto-optic shutter is provided
The fibre optic gyroscope and its method that existing multi-turn detours.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of fibre optic gyroscope that realization multi-turn based on magneto-optic shutter detours, including wide spectrum light source, coupler, Y waveguide,
First polarization beam apparatus, Faraday rotator, the second polarization beam apparatus, Fibre Optical Sensor ring and photodetector；
The receiving end of the output end of the wide spectrum light source and photodetector two ports with coupler the same side respectively
Optical fiber connection, a port of the coupler other side are connect with Y waveguide input port fiber；Y waveguide the first output port 3-1 and
Second output terminal mouth 3-2 respectively with the 4th port 6-4 optical fiber of the 4th port 4-4 of the first polarization beam apparatus and the second polarization beam apparatus
Connection；Faraday rotator, the current line of Faraday rotator are set among the first polarization beam apparatus and the second polarization beam apparatus
Circle is connect with DC power supply, the first polarization beam apparatus second port 4-2 and the second polarization beam apparatus second port 6-2 respectively with method
The port of rotator two sides is drawn to connect；First polarization beam apparatus first port 4-1 and the second polarization beam apparatus first port 6-1
It is connect respectively with Fibre Optical Sensor ring；
Obtained optical signal is converted to electric signal by electric explorer, is added on Y waveguide by signal processing module generation
Feedback signal realizes closed-loop control.
As the preferred embodiment of the present invention, the wide spectrum light source uses mean wavelength for 1300nm, and spectrum width is
35nm has the SLD light source of high-polarization.
As the preferred embodiment of the present invention, the coupler uses polarization-maintaining coupler.
As the preferred embodiment of the present invention, the Fibre Optical Sensor ring uses the polarization maintaining optical fibre of 500m, and fiber optic loop is flat
Equal diameter is 90mm.
As the preferred embodiment of the present invention, the first polarization beam apparatus and the second polarization beam apparatus use barium metaborate system
At.
The invention also discloses a kind of fibre optic gyroscopes to realize the light beam method that multi-turn detours in fiber optic loop, specifically
Scheme is as follows:
Two beams exported from Y waveguide the first output port 3-1 and Y waveguide second output terminal mouth 3-2 are polarized with the s of polarization state
Light respectively enters the first polarization beam apparatus the 4th port 4-4 and the 4th port 6-4 of the second polarization beam apparatus, according to birefringent effect
It answers, two beam s polarised lights are respectively coupled to the first polarization beam apparatus second port 4-2 and the second polarization beam apparatus second port 6-
2；The current coil of Faraday rotator is connect with DC power supply, draws rotation by the field control methods that current coil generates
Two beam s polarised lights are become two beam p-polarization lights, this two beams p-polarization so that the polarization direction of two beam s polarised lights is rotated by 90 ° by device
Light respectively by the first polarization beam apparatus second port 4-2 and the second polarization beam apparatus second port 6-2, then directly passes through again
First polarization beam apparatus first port 4-1 and the second polarization beam apparatus first port 6-1 enter in Fibre Optical Sensor ring；
The time that the electric current in control magnetic field maintains light to enclose around fiber optic loop one, electric current is closed later, so that inclined along inverse two beam p
Vibration light does not change polarization state and detours in fiber optic loop multi-turn, then electric current is opened, so that the p-polarization rotated in Fibre Optical Sensor ring
Light becomes s polarised light after Faraday rotator, two beam s polarised lights pass through respectively the first polarization beam apparatus second port 4-2 and
Second polarization beam apparatus second port 6-2, according to birefringence effect, two beam s polarised lights are respectively coupled to the first polarization beam splitting
Device the 4th port 4-4 and the 4th port 6-4 of the second polarization beam apparatus return to Y waveguide.
In the present invention, the two-beam for forming interference has detoured n circle in Fibre Optical Sensor ring, the optical fiber for being L for length
For sensing ring, light path that practical light is passed by is nL, therefore the phase difference between the two-beam as caused by revolving speed is practical is
The invention has the benefit that the on-off control of DC power supply can be passed through under conditions of optical fiber ring length is constant
The magnetic field of current coil in Faraday rotator processed realizes that light beam multi-turn in fiber optic loop detours, doubles turn signal；Due to protecting
Polarisation fibre is expensive, and Fibre Optical Sensor is longer around ring length, and sensitivity is higher, and present invention may also be implemented in do not change precision
Under the premise of, reduce Fibre Optical Sensor ring length, effectively noise can be inhibited to can be reduced cost again.The present invention realizes light in fiber optic loop
Interior multi-turn circulation detours, and can get higher precision and highly sensitive optical fibre gyro.
Detailed description of the invention
Fig. 1 is a kind of fibre optic gyroscope structural schematic diagram that the realization multi-turn based on magneto-optic shutter detours；
Fig. 2 is a kind of fibre optic gyroscope paths schematic diagram that the realization multi-turn based on magneto-optic shutter detours；
In figure: 1 wide spectrum light source, 2 couplers, 3Y waveguide, 4 first polarization beam apparatus, 5 Faraday rotators, 6 second polarizations
Beam splitter, 7 Fibre Optical Sensor rings, 8 photodetectors, 9 DC power supplies, the first output port of 3-1Y waveguide, 3-2Y waveguide second are defeated
Exit port, the first polarization beam apparatus of 4-1 first port, the first polarization beam apparatus of 4-2 second port, the first polarization beam apparatus of 4-3
Third port, the 4th port of the first polarization beam apparatus of 4-4,5-1 Faraday rotator first port, 5-2 Faraday rotator
Two-port netwerk, the second polarization beam apparatus of 6-1 first port, the second polarization beam apparatus of 6-2 second port, the second polarization beam apparatus of 6-3
Third port, the 4th port of the second polarization beam apparatus of 6-4,7-1 Fibre Optical Sensor ring first port, 7-2 Fibre Optical Sensor ring second end
Mouthful.
Specific embodiment
As shown in Figure 1, a kind of fibre optic gyroscope structural schematic diagram that the realization multi-turn based on magneto-optic shutter detours, including width
Compose light source 1, coupler 2, Y waveguide 3, the first polarization beam apparatus 4, Faraday rotator 5, the second polarization beam apparatus 6, Fibre Optical Sensor
Ring 7, photodetector 8；
The output end of the wide spectrum light source 1 and the receiving end of photodetector 8 are held with two of 2 the same side of coupler respectively
Mouth optical fiber connection, a port of 2 other side of coupler are connect with 3 input port fiber of Y waveguide；The first output port of Y waveguide
3-1 and Y waveguide second output terminal mouth 3-2 respectively with the 4th port 4-4 of the first polarization beam apparatus and the second polarization beam apparatus the 4th
The connection of port 6-4 optical fiber；Faraday rotator 5, faraday are set among the first polarization beam apparatus 4 and the second polarization beam apparatus 6
The current coil of rotator 5 is connect with DC power supply 9, the first polarization beam apparatus second port 4-2 and the second polarization beam apparatus
Two-port netwerk 6-2 is connect with Faraday rotator first port 5-1 and Faraday rotator second port 5-2 optical fiber respectively；
First polarization beam apparatus first port 4-1 and the second polarization beam apparatus first port 6-1 respectively with Fibre Optical Sensor ring
First port 7-1 is connected with Fibre Optical Sensor ring second port 7-2 optical fiber；Obtained optical signal is converted to telecommunications by electric explorer
Number, the feedback signal being added on Y waveguide is generated by signal processing module, realizes closed-loop control.
In light communication process, the light issued from wide spectrum light source 1 reaches Y waveguide through coupler, perpendicular to substrate surface
P-polarization light be attenuated, and be parallel to the s polarised light of substrate surface respectively from Y waveguide the first output port 3-1 and Y waveguide
Two output port 3-2 beam splitting output；The s polarised light wherein exported from the first output port of Y waveguide reaches the first polarization beam apparatus
4th port 4-4, according to birefringence effect, s polarised light is coupled to the first polarization beam apparatus second port 4-2, then from method
It draws rotator first port 5-1 to enter faraday sensor, is exported from Faraday rotator second port 5-2, reach second
Polarization beam apparatus second port 6-2；The s polarised light exported from Y waveguide second output terminal mouth reaches the second polarization beam apparatus the 4th
Port 6-4, according to birefringence effect, s polarised light is coupled to the second polarization beam apparatus second port 6-2, then from faraday
Rotator second port 5-2 enters faraday sensor, exports from Faraday rotator first port 5-1, reaches the first polarization
Beam splitter second port 4-2；If Faraday rotator current coil is in energized state, s polarised light passes through Faraday rotation
After device, the polarization direction of light is rotated by 90 °, and s polarised light is become p-polarization light, if Faraday rotator current coil is in
Off-position, then after s polarised light passes through Faraday rotator, the polarization direction of light is constant, keeps original s polarised light.
If the light that the first polarization beam apparatus second port 4-2 is exported and reached from Faraday rotator first port 5-1 is p
Polarised light, then p-polarization light directly passes sequentially through the first polarization beam apparatus first port 4-1 and Fibre Optical Sensor ring first port 7-1
A circle is rotated clockwise into Fibre Optical Sensor ring, then through the second polarization beam splitting after Fibre Optical Sensor ring second port 7-2 output
Device first port 6-1, the second polarization beam apparatus second port 6-2, Faraday rotator second port 5-2, Faraday rotator
First port 5-1 arrives again at the first polarization beam apparatus second port 4-2；
If the light that the first polarization beam apparatus second port 4-2 is exported and reached from Faraday rotator first port 5-1 is s
Polarised light, according to birefringence effect, s polarised light is coupled to the 4th port 4-4 of the first polarization beam apparatus, returns to Y waveguide first
Output port 3-1；
Similarly, the light of the second polarization beam apparatus second port 6-2 is exported and reached from Faraday rotator second port 5-2
For p-polarization light, then p-polarization light enter Fibre Optical Sensor ring revolve counterclockwise turn around after turn again to the second polarization beam apparatus second end
Mouth 6-2；If the light that the second polarization beam apparatus second port 6-2 is exported and reached from Faraday rotator second port 5-2 is that s is inclined
Shake light, then according to birefringence effect, s polarised light is coupled to the 4th port 6-4 of the second polarization beam apparatus, returns to Y waveguide second
Output port 3-2；
The two beam s polarised lights returned from Y waveguide the first output port 3-1 and Y waveguide second output terminal mouth 3-2 are in Y waveguide
It inside interferes, by photodetector interference signal is obtained after entering coupler from Y waveguide output port, light is believed
Number electric signal is converted to, exports demodulation value after carrying out digital demodulation to signal by signal processing module, while obtaining feedback letter
Number, Y waveguide 3 is modulated.
As a preferred embodiment of the present invention, in the fibre optic gyroscope, wide spectrum light source, which uses, has high polarization
The SLD light source of degree；Coupler is the polarization-maintaining coupler of 50% splitting ratio；Y waveguide is Y type lithium niobate waveguides chip；First polarization
Beam splitter and the second polarization beam apparatus are using made of barium metaborate.
It is the explanation of the structure and principle to the fibre optic gyroscope in the present invention above, using the optical fibre gyro in the present invention
Instrument may be implemented light beam multi-turn in fiber optic loop and detour, implementation method are as follows:
Paths schematic diagram as shown in Figure 2, from Y waveguide the first output port 3-1 and Y waveguide second output terminal mouth 3-
Two beams of 2 outputs respectively enter the 4th port 4-4 of the first polarization beam apparatus and the second polarization beam apparatus with the s polarised light of polarization state
4th port 6-4, according to birefringence effect, two beam s polarised lights be respectively coupled to the first polarization beam apparatus second port 4-2 and
Second polarization beam apparatus second port 6-2；The current coil of Faraday rotator is connect with DC power supply, is produced by current coil
Raw field control methods draw rotator that two beam s polarised lights are become two so that the polarization direction of two beam s polarised lights is rotated by 90 °
Beam p-polarization light, this two beams p-polarization light pass through the first polarization beam apparatus second port 4-2 and the second polarization beam apparatus the respectively again
Two-port netwerk 6-2, then directly by after the first polarization beam apparatus first port 4-1 and the second polarization beam apparatus first port 6-1
Enter in Fibre Optical Sensor ring from Fibre Optical Sensor ring first port 7-1 and Fibre Optical Sensor ring second port 7-2 respectively；
The time that the electric current in control magnetic field maintains light to enclose around fiber optic loop one, electric current is closed later, in off-position
Faraday rotator will not change the polarization direction of light so that along inverse two beam p-polarization lights do not change polarization state in fiber optic loop around
Row multi-turn；After electric current is opened again, the Faraday rotator in energized state makes the p-polarization rotated in Fibre Optical Sensor ring
Light becomes s polarised light after Faraday rotator, two beam s polarised lights pass through respectively the first polarization beam apparatus second port 4-2 and
Second polarization beam apparatus second port 6-2, according to birefringence effect, two beam s polarised lights are respectively coupled to the first polarization beam splitting
Device the 4th port 4-4 and the 4th port 6-4 of the second polarization beam apparatus return to Y waveguide.
Under identical input signal and device conditions, the two-beam that the present invention forms interference detours in Fibre Optical Sensor ring
N circle, for length is the Fibre Optical Sensor ring of L, the light path that practical light passes by is nL, therefore the two-beam as caused by revolving speed
Between phase difference practical beThe turn signal amplitude of fibre optic gyroscope output is traditional fiber gyro
N times of instrument, and there is degree of precision.
Claims (6)
1. a kind of fibre optic gyroscope that the realization multi-turn based on magneto-optic shutter detours, it is characterised in that including wide spectrum light source (1), coupling
Clutch (2), Y waveguide (3), the first polarization beam apparatus (4), Faraday rotator (5), the second polarization beam apparatus (6), Fibre Optical Sensor
Ring (7) and photodetector (8)；
The receiving end of the output end of the wide spectrum light source and photodetector two fiber ports with coupler the same side respectively
Connection, a port of the coupler other side are connect with Y waveguide input port fiber；The first output port of Y waveguide (3-1) and
Two output ports (3-2) respectively with the 4th port (4-4) of the first polarization beam apparatus and the 4th port (6-4) of the second polarization beam apparatus
Optical fiber connection；Faraday rotator, the electricity of Faraday rotator are set among the first polarization beam apparatus and the second polarization beam apparatus
Streamline circle is connect with DC power supply (9), the first polarization beam apparatus second port (4-2) and the second polarization beam apparatus second port
(6-2) is connect with the port of Faraday rotator two sides respectively；First polarization beam apparatus first port (4-1) and the second polarization point
Beam device first port (6-1) is connect with Fibre Optical Sensor ring respectively；
Obtained optical signal is converted to electric signal by photodetector, is added in by signal processing module generation anti-on Y waveguide
Feedback signal realizes closed-loop control.
2. the fibre optic gyroscope that a kind of realization multi-turn based on magneto-optic shutter as described in claim 1 detours, which is characterized in that
The wide spectrum light source uses mean wavelength for 1300nm, and spectrum width is the SLD light source that 35nm has high-polarization.
3. the fibre optic gyroscope that a kind of realization multi-turn based on magneto-optic shutter as described in claim 1 detours, which is characterized in that
The coupler uses polarization-maintaining coupler.
4. the fibre optic gyroscope that a kind of realization multi-turn based on magneto-optic shutter as described in claim 1 detours, which is characterized in that
The Fibre Optical Sensor ring uses the polarization maintaining optical fibre of 500m, and fiber optic loop average diameter is 90mm.
5. the fibre optic gyroscope that a kind of realization multi-turn based on magneto-optic shutter as described in claim 1 detours, which is characterized in that
First polarization beam apparatus and the second polarization beam apparatus are made of barium metaborate.
6. a kind of any one of claims 1-5 fibre optic gyroscope realizes the light beam method that multi-turn detours in fiber optic loop,
It is characterized by: the same polarization state of two beams exported from the first output port of Y waveguide (3-1) and Y waveguide second output terminal mouth (3-2)
S polarised light respectively enter the 4th port (4-4) of the first polarization beam apparatus and the 4th port (6-4) of the second polarization beam apparatus, according to
According to birefringence effect, two beam s polarised lights are respectively coupled to the first polarization beam apparatus second port (4-2) and the second polarization beam splitting
Device second port (6-2)；The current coil of Faraday rotator is connect with DC power supply, is controlled by the magnetic field that current coil generates
Two beam s polarised lights are become two beam p-polarization lights so that the polarization direction of two beam s polarised lights is rotated by 90 ° by Faraday rotator processed,
This two beams p-polarization light passes through the first polarization beam apparatus second port (4-2) and the second polarization beam apparatus second port (6- respectively again
2) light directly then, is entered by the first polarization beam apparatus first port (4-1) and the second polarization beam apparatus first port (6-1)
In fibre sensing ring；
The time that the electric current in control magnetic field maintains light to enclose around fiber optic loop one, electric current is closed later, so that along inverse two beam p-polarization lights
Do not change polarization state to detour in fiber optic loop multi-turn, then electric current is opened, so that the p-polarization light warp rotated in Fibre Optical Sensor ring
Become s polarised light after Faraday rotator, two beam s polarised lights pass through the first polarization beam apparatus second port (4-2) and respectively
Two polarization beam apparatus second ports (6-2), according to birefringence effect, two beam s polarised lights are respectively coupled to the first polarization beam splitting
The 4th port (4-4) of device and the 4th port (6-4) of the second polarization beam apparatus return to Y waveguide.
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| CN201910732662.0A CN110426027B (en) | 2019-08-09 | 2019-08-09 | Optical fiber gyroscope for realizing multi-turn winding based on magneto-optical switch and method thereof |
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| CN201910732662.0A CN110426027B (en) | 2019-08-09 | 2019-08-09 | Optical fiber gyroscope for realizing multi-turn winding based on magneto-optical switch and method thereof |
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| CN111024058A (en) * | 2019-12-10 | 2020-04-17 | 浙江大学 | Optical fiber gyroscope for realizing multiple detours based on electro-optical effect switch and method thereof |
| CN111089578A (en) * | 2020-01-21 | 2020-05-01 | 燕山大学 | Interference type optical fiber gyroscope |
| CN111811494A (en) * | 2020-07-03 | 2020-10-23 | 浙江大学 | Multiple optical multiplication device and method for optical fiber gyroscope light path |
| CN111811495A (en) * | 2020-07-03 | 2020-10-23 | 浙江大学 | Optical multiple multiplication device and method of polarization maintaining optical fiber ring |
| CN114674302A (en) * | 2022-05-30 | 2022-06-28 | 深圳奥斯诺导航科技有限公司 | Dual-polarization optical fiber gyroscope with dead-end optical power recycling function |
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