CN101067556A - Four-frequency differential Brillouin optical fiber gyroscope - Google Patents
Four-frequency differential Brillouin optical fiber gyroscope Download PDFInfo
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Abstract
The invention provides a four-frequency differential Brillouin optical-fiber gyro, comprising narrow-line width optical-fiber laser, first isolator, first coupler, first pumped light, second pumped light, adjustable light attenuator, acousto-optic frequency shifter, second isolator, second coupler, third coupler, four-frequency differential detector, optical-fiber annular cavity, first detector and closed-loop feedback circuit. And it uses the frequency-biasing technique of pumped light to solve the problem of determining frequency locking and rotating directions and uses the four-frequency differential detection technique to eliminate the errors caused by unstable frequency biasing so as to obtain high-accuracy Brillouin optical gyro.
Description
(1) technical field
The present invention relates to the gyroscopic apparatus in a kind of optical fiber, specifically relate to fibre optic gyroscope based on stimulated Brillouin scattering principle and four-frequency differential detection method.
(2) background technology
First generation interference optical fiber top, second generation resonant cavity type optical fibre gyro and third generation Brillouin fiber optic gyro have been experienced in the optical fibre gyro development.At present, the interference optical fiber top of various precision has had commercial product, and the resonant cavity type optical fibre gyro is owing to some difficulties of technical existence thereby still be in conceptual phase.A new generation's Brillouin fiber optic gyro has caused people's extensive concern because of its advantage that has.Brillouin fiber optic gyro has some common advantages of optical fibre gyro: start-up time is short, and volume is little, and is in light weight, low in energy consumption, anti-electromagnetic interference (EMI), and dynamic range is big, and bandwidth is big, and is simple in structure, and the reliability height is non-maintaining etc.In addition the distinctive advantage of Brillouin fiber optic gyro is: Brillouin fiber optic gyro does not need complicated input and signal processing system, and the beat signal of output can directly be handled, and therefore required optics and electronic unit are less; Because Brillouin laser has extremely narrow live width, therefore has very high precision in theory; Employed optical fiber is shorter, is generally 10～20m, can reduce cost, simplified system.Therefore, Brillouin fiber optic gyro is the optical fibre gyro high precision, low cost, the new direction of miniaturization.At present the design proposal of the optical fibre gyro of closely open report is more, and for example neutral application number is 00104219.X, and name is called " laser gyro with optical fibre ring " etc., but about the report of the design proposal of Brillouin fiber optic gyro and seldom.
Brillouin fiber optic gyro is a kind of active laser gyro, so it will produce frequency lock in phenomenon inevitably: promptly hour at angular velocity of rotation, and the output beat note zero.This is to produce owing to the backscattering in the ring cavity causes frequency pulling.And the beat signal of output is only relevant with speed of rotation, therefore also can't judge sense of rotation.The H.J.Shaw of Stanford University leader's research group proposes to use the push-and-pull phase modulation (PM) to solve the method (S.Huang et al.Synthetic heterodyne detection in a fiber-opticring-laser gyro.Opt.Lett.1993,18:81～83) of frequency lock and judgement sense of rotation.But owing in optic fiber ring-shaped cavity, introduce two phase-modulators, its cymomotive force (CMF) must cause the frequency stability of output Brillouin light, thereby for system introduces error, moreover, optic fiber ring-shaped cavity is carried out depth phase modulation and signal Processing all compare difficulty, so be difficult to reach the practicability requirement.
(3) summary of the invention
The object of the present invention is to provide a kind of problems such as judgement that can solve frequency lock and sense of rotation, eliminate the offset frequency instability, high-precision four-frequency differential Brillouin optical fiber gyroscope.
The object of the present invention is achieved like this: comprise narrow cable and wide optical fiber laser 1, first isolator 2, first coupling mechanism 3, first pump light 4, second pump light 5, adjustable optical attenuator 6, acousto-optic frequency shifters 7, second isolator 8, second coupling mechanism 9, the 3rd coupling mechanism 10, four-frequency differential sniffer 11, optic fiber ring-shaped cavity 12, first detector 13 and close-loop feedback circuit 14; Narrow cable and wide optical fiber laser 1 output connects first coupling mechanism 3 behind first isolator 2, the output of first coupling mechanism 3 is divided into two-way, i.e. first pump light 4 and second pump light 5, wherein first pump light 4 is imported acousto-optic frequency shifters 7, second pump light, 5 input adjustable optical attenuators 6, first pump light 4 that goes out acousto-optic frequency shifters 7 is connected optic fiber ring-shaped cavity 12 by second coupling mechanism 9 with the 3rd coupling mechanism 10 respectively with second pump light 5 that goes out adjustable optical attenuator 6, the two ends of second coupling mechanism 9 and the 3rd coupling mechanism 10 are connected with four-frequency differential sniffer 11, be connected with first detector 13 and close-loop feedback circuit 14 behind first isolator 2, close-loop feedback circuit 14 connects optic fiber ring-shaped cavity 12.
The present invention can also comprise:
1, the coupling ratio of described first coupling mechanism 3, second coupling mechanism 9, the 3rd coupling mechanism 10 is 50: 50.
2, described optic fiber ring-shaped cavity 12 is connected to form by the 4th coupling mechanism 12-1, fiber optic loop 12-2, the first Brillouin laser 12-3, the second Brillouin laser 12-4 and phase-modulator 12-5, and close-loop feedback circuit 14 connects the phase-modulator 12-5 of optic fiber ring-shaped cavity 12.
3, described four-frequency differential sniffer 11 is made up of the 5th coupling mechanism 11-1, the 6th coupling mechanism 11-2, the second detector 11-3, the 3rd detector 11-4 and difference channel 11-5, the 5th coupling mechanism 11-1 connects the second detector 11-3, the 6th coupling mechanism 11-2 connects the 3rd detector 11-4, and the second detector 11-3 is connected difference channel 11-5 with the 3rd detector 11-4.
4, described close-loop feedback circuit 14 is by pre-amplification circuit 14-1, filtering circuit 14-2, A/D converter 14-3, main control singlechip 14-4, D/A converter 14-5 and phase-modulator driving circuit 14-6 form, first detector 13 connects pre-amplification circuit 14-1, pre-amplification circuit 14-1 connects by filtering circuit 14-2, filtering circuit 14-2 connects main control singlechip 14-4 through A/D converter 14-3, the output of main control singlechip 14-4 connects phase-modulator driving circuit 14-6 by D/A converter 14-5, and the output of phase-modulator driving circuit 14-6 connects the phase-modulator 12-5 in the optic fiber ring-shaped cavity 12.
The principle of Brillouin fiber optic gyro is in optic fiber ring-shaped cavity, constitutes two brillouin fiber ring lasers with stimulated Brillouin scattering (SBS) as gain, and then makes two bundle Brillouin lasers interfere the formation beat frequency to constitute gyro.The acoustic wavefield of being excited that SBS can regard as in pump light and the medium interact to produce the nonlinear effect of rear orientation light.Rear orientation light is referred to as Stokes light, and its frequency moves down 2v/ λ with respect to pump light, and wherein v is the velocity of sound in the medium, and λ is the wavelength of pump light in medium.The pump light and the reverse Stokes interference of light produce the standing wave of motion, produce by the electrostriction effect and are excited acoustic wavefield.Use fiber annular resonant cavity, can realize low threshold value Brillouin laser.Because SBS has gain direction susceptibility, this make in same ring cavity can independent operating two beam reversals Brillouin laser, the brillouin gain that its gain produces from the pump light of backward pumping.
The laser of narrow cable and wide optical fiber laser 1 output of the present invention is divided into two-way by first coupling mechanism 3 behind first isolator 2.Wherein first pump light 4 frequency after acousto-optic frequency shifters 7 of one tunnel moves down several longitudinal mode spacings, is about tens MHz, to obtain big offset frequency.First pump light 4 and second pump light 5 enter optic fiber ring-shaped cavity 12 by second coupling mechanism 9 and the 3rd coupling mechanism 10 respectively, when the resonance frequency coupling of first pump light 4 and second pump light 5 and optic fiber ring-shaped cavity 12 and power surpass threshold value, will produce first Brillouin laser and second Brillouin laser respectively, survey the beat frequency of first pump light 4 and 5 generations of second pump light and the beat frequency of first Brillouin laser and the generation of second Brillouin laser respectively by four-frequency differential detection system 11 at last, both subtract each other the beat signal that just can obtain owing to the rotation generation, the method can eliminate because first pump light 4 that acousto-optic frequency shifters 7 causes and the offset frequency instability of second pump light 5, can eliminate the dead band that frequency lock produces owing to introduce inherent frequency error, and by relatively the beat frequency of gyro output signal and the size of inherent frequency error are judged sense of rotation.
Four-frequency differential Brillouin optical fiber gyroscope of the present invention utilizes the offset frequency technology of pump light to solve frequency lock and judges the problem of sense of rotation, thereby and utilizes the four-frequency differential detection technique to eliminate that offset frequency is unstable to obtain high-precision Brillouin fiber optic gyro.
(4) description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the formation block diagram of close-loop feedback circuit.
(5) embodiment
For example the present invention is done description in more detail below in conjunction with accompanying drawing:
In conjunction with Fig. 1, the four-frequency differential Brillouin optical fiber gyroscope of present embodiment is by narrow cable and wide optical fiber laser 1, first isolator 2, first coupling mechanism 3, first pump light 4, second pump light 5, adjustable optical attenuator 6, acousto-optic frequency shifters 7, second isolator 8, second coupling mechanism 9, the 3rd coupling mechanism 10, four-frequency differential sniffer 11, optic fiber ring-shaped cavity 12, first detector 13 and close-loop feedback circuit 14 are formed, the laser of narrow cable and wide optical fiber laser 1 output is connected with the input end of first isolator 2, the output terminal of first isolator 2 is connected with first port of first coupling mechanism 3, the coupling ratio of described first coupling mechanism 3 is 50: 50, the laser of being divided equally narrow cable and wide optical fiber laser 1 output by first coupling mechanism 3 forms first pump light 4 and second pump light 5, first pump light 4 is connected to the input end of acousto-optic frequency shifters 7 by the 4th port of first coupling mechanism 3, the effect of described acousto-optic frequency shifters 7 is that first pump light 4 is carried out offset frequency, the output terminal of acousto-optic frequency shifters 7 is connected with the input end of second isolator 8, the output terminal of second isolator 8 is connected with first port of second coupling mechanism 9, the coupling ratio of described second coupling mechanism 9 is 50: 50, it is divided into two parts to first pump light 4, wherein a part is connected to the input end 11-2-1 of four-frequency differential detection system 11 by the 4th port of second coupling mechanism 9, another part is connected to the input end 12-1-1 of optic fiber ring-shaped cavity 12 by the 3rd port of second coupling mechanism 9, the first Brillouin laser 12-3 that produces in optic fiber ring-shaped cavity 12 turns back to the 3rd port of second coupling mechanism 9, second port output from second coupling mechanism 9, be connected to the input end 11-1-1 of four-frequency differential detection system 11 then, second pump light 5 is connected to the input end of adjustable optical attenuator 6 by the 3rd port of first coupling mechanism 3, the effect of described adjustable optical attenuator 6 is to regulate the power of second pump light 5 when arriving optic fiber ring-shaped cavity 12 to equate with the power of first pump light 4 that arrives optic fiber ring-shaped cavity 12, the output terminal of adjustable optical attenuator 6 is connected with first port of the 3rd coupling mechanism 10, the coupling ratio of described the 3rd coupling mechanism 10 is 50: 50, it is divided into two parts to second pump light 5, wherein a part is connected to the input end 11-2-2 of four-frequency differential detection system 11 by the 4th port of the 3rd coupling mechanism 10, another part is connected to the input end 12-1-3 of optic fiber ring-shaped cavity 12 by the 3rd port of the 3rd coupling mechanism 10, the second Brillouin laser 12-4 that produces in optic fiber ring-shaped cavity 12 turns back to the 3rd port of the 3rd coupling mechanism 10, second port output from the 3rd coupling mechanism 10, be connected to the input end 11-1-2 of four-frequency differential detection system 11 then, described first pump light 4 is understood some light enters the 3rd coupling mechanism 10 by the 12-1-3 port the 3rd port after entering optic fiber ring-shaped cavity 12, enter first detector 13 by the adjustable optical attenuator 6 and first coupling mechanism 3 then, the output terminal of first detector 13 is connected with the input end of close-loop feedback circuit 14, the output terminal of close-loop feedback circuit 14 is connected with phase-modulator 12-5 in the optic fiber ring-shaped cavity 12, and the effect of described close-loop feedback circuit 14 is to make optic fiber ring-shaped cavity 12 reach resonant condition by steady operations.The output wavelength of described narrow cable and wide optical fiber laser 1 is 1550nm, and the model of employing is Koheras Adjustik C15 (KOHERAS company, a Denmark).
Optic fiber ring-shaped cavity 12 is made up of the 4th coupling mechanism 12-1, fiber optic loop 12-2, the first Brillouin laser 12-3, the second Brillouin laser 12-4 and phase-modulator 12-5.First pump light 4 enters optic fiber ring-shaped cavity 12 by first port of the 4th coupling mechanism 12-1, frequency and optic fiber ring-shaped cavity 12 resonance frequencies coupling when first pump light 4, and when first pump light 4 reaches the brillouin fiber ring laser threshold value, will produce the first Brillouin laser 12-3 dorsad and export from first port of the 4th coupling mechanism 12-1, second pump light 5 enters optic fiber ring-shaped cavity 12 by the 3rd port of the 4th coupling mechanism 12-1, frequency and optic fiber ring-shaped cavity 12 resonance frequencies coupling when second pump light 5, and when second pump light 5 reaches the brillouin fiber ring laser threshold value, will produce the second Brillouin laser 12-4 dorsad and export from the 3rd port of the 4th coupling mechanism 12-1, phase-modulator 12-5 mates the resonance frequency of ring cavity by 14 controls of close-loop feedback circuit all the time with pump light.The coupling ratio of described the 4th coupling mechanism 12-1 is 98: 2～95: 5, and the model of phase-modulator 12-5 is FPS-001 (General Photonics company, the U.S.).
Four-frequency differential sniffer 11 is made up of the 5th coupling mechanism 11-1, the 6th coupling mechanism 11-2, the second detector 11-3, the 3rd detector 11-4 and difference channel 11-5.First pump light 4 and second pump light 5 enter the 6th coupling mechanism 11-2 from first port and second port of the 6th coupling mechanism 11-2 respectively, survey the beat frequency that the inherent frequency error between first pump light 4 and second pump light 5 causes by the 3rd port output of the 6th coupling mechanism 11-2 and by the 3rd detector 11-4 then, the first Brillouin laser 12-3 and the second Brillouin laser 12-4 that produce in optic fiber ring-shaped cavity 12 enter the 5th coupling mechanism 11-1 from the 5th coupling mechanism 11-1 first port and second port respectively, export and survey the beat frequency of the first Brillouin laser 12-3 and second Brillouin laser 12-4 generation then by the second detector 11-3 by the 3rd port of the 5th coupling mechanism 11-1, the output signal of the second detector 11-3 and the 3rd detector 11-4 is handled by difference channel 11-5, the inherent frequency error that just can deduct between first pump light 4 and second pump light 5 obtains owing to rotate the beat frequency that produces, and the method can be eliminated the offset frequency instability of first pump light 4 and second pump light 5.The coupling ratio of described the 5th coupling mechanism 11-1 and the 6th coupling mechanism 11-2 is 50: 50.
In conjunction with Fig. 2, close-loop feedback circuit 14 is made up of pre-amplification circuit 14-1, filtering circuit 14-2, A/D converter 14-3, main control singlechip 14-4, D/A converter 14-5 and phase-modulator driving circuit 14-6.The signal that pre-amplification circuit 14-1 surveys first detector 13 amplifies, by filtering circuit 14-2 filter away high frequency noise, convert digital signal to through A/D converter 14-3 then and deliver to the position that main control singlechip 14-4 judges ring cavity off resonance this moment, after judging, main control singlechip 14-4 provides next step drive signal, this drive signal converts simulating signal to by D/A converter 14-5 again, amplifies on the phase-modulator 12-5 that is loaded in the optic fiber ring-shaped cavity 12 via phase-modulator driving circuit 14-6 at last.
Claims (5)
1, a kind of four-frequency differential Brillouin optical fiber gyroscope comprises narrow cable and wide optical fiber laser (1), first isolator (2), first coupling mechanism (3), first pump light (4), second pump light (5), adjustable optical attenuator (6), acousto-optic frequency shifters (7), second isolator (8), second coupling mechanism (9), the 3rd coupling mechanism (10), four-frequency differential sniffer (11), optic fiber ring-shaped cavity (12), first detector (13) and close-loop feedback circuit (14); It is characterized in that: narrow cable and wide optical fiber laser (1) output connects first coupling mechanism (3) behind first isolator (2), the output of first coupling mechanism (3) is divided into two-way, i.e. first pump light (4) and second pump light (5), wherein first pump light (4) is imported acousto-optic frequency shifters (7), second pump light (5) input adjustable optical attenuator (6), first pump light (4) that goes out acousto-optic frequency shifters (7) is connected optic fiber ring-shaped cavity (12) by second coupling mechanism (9) with the 3rd coupling mechanism (10) respectively with second pump light (5) that goes out adjustable optical attenuator (6), the two ends of second coupling mechanism (9) and the 3rd coupling mechanism (10) are connected with four-frequency differential sniffer (11), be connected with first detector (13) and close-loop feedback circuit (14) behind first isolator (2), close-loop feedback circuit (14) connects optic fiber ring-shaped cavity (12).
2, four-frequency differential Brillouin optical fiber gyroscope according to claim 1 is characterized in that: the coupling ratio of described first coupling mechanism (3), second coupling mechanism (9), the 3rd coupling mechanism (10) is 50: 50.
3, four-frequency differential Brillouin optical fiber gyroscope according to claim 1 and 2, it is characterized in that: described optic fiber ring-shaped cavity (12) is connected to form by the 4th coupling mechanism (12-1), fiber optic loop (12-2), first Brillouin laser (12-3), second Brillouin laser (12-4) and phase-modulator (12-5), and close-loop feedback circuit (14) connects the phase-modulator (12-5) of optic fiber ring-shaped cavity (12).
4, four-frequency differential Brillouin optical fiber gyroscope according to claim 1 and 2, it is characterized in that: described four-frequency differential sniffer (11) is made up of the 5th coupling mechanism (11-1), the 6th coupling mechanism (11-2), second detector (11-3), the 3rd detector (11-4) and difference channel (11-5), the 5th coupling mechanism (11-1) connects second detector (11-3), the 6th coupling mechanism (11-2) connects the 3rd detector (11-4), and second detector (11-3) is connected difference channel (11-5) with the 3rd detector (11-4).
5, four-frequency differential Brillouin optical fiber gyroscope according to claim 1 and 2, it is characterized in that: described close-loop feedback circuit (14) is by pre-amplification circuit (14-1), filtering circuit (14-2), A/D converter (14-3), main control singlechip (14-4), D/A converter (14-5) and phase-modulator driving circuit (14-6) are formed, first detector (13) connects pre-amplification circuit (14-1), pre-amplification circuit (14-1) connects by filtering circuit (14-2), filtering circuit (14-2) connects main control singlechip (14-4) through A/D converter (14-3), the output of main control singlechip (14-4) connects phase-modulator driving circuit (14-6) by D/A converter (14-5), and the output of phase-modulator driving circuit (14-6) connects the phase-modulator (12-5) in the optic fiber ring-shaped cavity (12).
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102278984A (en) * | 2011-05-23 | 2011-12-14 | 北京航空航天大学 | Filtering method and device for noise suppression of high-precision optical fiber gyroscope system |
| CN102519446A (en) * | 2011-12-12 | 2012-06-27 | 浙江大学 | Resonant optical gyroscope based on fast-speed high-precision frequency tracking and locking technology |
| CN105424023A (en) * | 2015-11-06 | 2016-03-23 | 东北林业大学 | Resonant-type fiber-optic gyroscope with adjustable sensitivity |
| CN109945903A (en) * | 2019-04-30 | 2019-06-28 | 安徽大学 | All optical fibre structure is adjustable chamber gain laser is from mixing vibration, displacement, velocity pick-up method and system |
| EP3647724A1 (en) * | 2018-11-02 | 2020-05-06 | Honeywell International Inc. | Three-pump stimulated brillouin scattering gyroscope |
| CN111947641A (en) * | 2020-08-06 | 2020-11-17 | 大连理工大学 | White light interference optical fiber gyroscope based on rhombic optical path difference offset structure |
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2007
- 2007-06-01 CN CNB2007100722953A patent/CN100570280C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102278984A (en) * | 2011-05-23 | 2011-12-14 | 北京航空航天大学 | Filtering method and device for noise suppression of high-precision optical fiber gyroscope system |
| CN102519446A (en) * | 2011-12-12 | 2012-06-27 | 浙江大学 | Resonant optical gyroscope based on fast-speed high-precision frequency tracking and locking technology |
| CN102519446B (en) * | 2011-12-12 | 2014-05-07 | 浙江大学 | Resonant optical gyroscope based on fast-speed high-precision frequency tracking and locking technology |
| CN105424023A (en) * | 2015-11-06 | 2016-03-23 | 东北林业大学 | Resonant-type fiber-optic gyroscope with adjustable sensitivity |
| CN105424023B (en) * | 2015-11-06 | 2018-05-18 | 东北林业大学 | The adjustable resonance type optical fiber gyro of sensitivity |
| EP3647724A1 (en) * | 2018-11-02 | 2020-05-06 | Honeywell International Inc. | Three-pump stimulated brillouin scattering gyroscope |
| US10731987B2 (en) | 2018-11-02 | 2020-08-04 | Honeywell International Inc. | Three-pump stimulated brillouin scattering gyroscope |
| CN109945903A (en) * | 2019-04-30 | 2019-06-28 | 安徽大学 | All optical fibre structure is adjustable chamber gain laser is from mixing vibration, displacement, velocity pick-up method and system |
| CN109945903B (en) * | 2019-04-30 | 2021-06-08 | 安徽大学 | All-fiber structure adjustable cavity gain laser self-mixing vibration, displacement and speed sensing method and system |
| CN111947641A (en) * | 2020-08-06 | 2020-11-17 | 大连理工大学 | White light interference optical fiber gyroscope based on rhombic optical path difference offset structure |
| CN111947641B (en) * | 2020-08-06 | 2022-09-20 | 大连理工大学 | White light interference optical fiber gyroscope based on rhombic optical path difference offset structure |
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