CN101694386A - High-sensitivity optical fiber gyroscope - Google Patents
High-sensitivity optical fiber gyroscope Download PDFInfo
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- CN101694386A CN101694386A CN200910154023A CN200910154023A CN101694386A CN 101694386 A CN101694386 A CN 101694386A CN 200910154023 A CN200910154023 A CN 200910154023A CN 200910154023 A CN200910154023 A CN 200910154023A CN 101694386 A CN101694386 A CN 101694386A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 103
- 230000003287 optical effect Effects 0.000 claims abstract description 22
- 239000000835 fiber Substances 0.000 claims description 36
- 238000012545 processing Methods 0.000 claims description 5
- 230000035945 sensitivity Effects 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 2
- 239000000919 ceramic Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
The invention discloses a high-sensitivity optical fiber gyroscope. On the basis of the traditional optical fiber gyroscope structure, the gyroscope is additionally provided with two 2*2 optical fiber acousto-optic switches, wherein the two 2*2 optical fiber acousto-optic switches are respectively inserted between the two output ports of a multifunctional integrated optical chip and between the two ports of an optical fiber sensor ring so that clockwise light and contraclockwise light can circulate in the optical fiber sensor ring many times and then be outputted. Compared with the traditional optical fiber gyroscope provided with the same optical fiber sensor ring, the sensor sensitivity is greatly increased. The invention avoids the large Shupe effect error caused by adopting the method of increasing the length of the sensor ring to improve the sensitivity.
Description
Technical field
The present invention relates to gyroscope, relate in particular to a kind of high-sensitivity optical fiber gyroscope.
Background technology
Fibre optic gyroscope is to utilize optics Sagnac effect to realize a kind of high-precision inertia sensing device that detects rotating.It is a kind of very important sensor, not only at aircraft navigation, and also in spacecraft guidance, satnav, the automobile orientation, intelligent robot, all many-sides such as astronomical telescope play a part very crucial.China mainly is devoted to the through engineering approaches of gyro, practical research present stage.In order to make gyro reach the requirement of practicability, the sensitivity that improves fibre optic gyroscope require just to seem very important.
For traditional interference type optical fiber gyroscope system, as shown in Figure 2, the light that is sent by light source 1 is divided into two through beam splitter 2, wherein a branch of input end that enters multifunction integrated optics chip 3, output after beam splitter in the chip 3 is divided into two light beam is wherein gone up light beam in the direction of the clock through returning chip 3 behind the Fibre Optical Sensor ring 5; Following light beam is counter clockwise through returning chip 3 behind the Fibre Optical Sensor ring 5; This two bundles clockwise light and counter-clockwise light form interference by the beam splitter in the chip 3 is synthetic, be divided into two through chip 3 input ends to beam splitter 2, wherein a branch ofly become electric signal by photodetector 7, through signal processing unit 8, produce feedback and be added in the chip 3 on the phase-modulator, and export the turn signal of gyroscope simultaneously with respect to inertial reference system.The shortcoming of this gyro is if increase sensitivity, must increase the fiber lengths of Fibre Optical Sensor ring 5, and when the space temperature field of Fibre Optical Sensor ring over time, can introduce Measurement Phase error (Shupe effect), sensing ring fiber lengths is long more, and the phase error of Shupe effect is difficult to overcome more.The present invention is exactly at a kind of very effective scheme that improves fibre optic gyroscope sensitivity.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of high-sensitivity optical fiber gyroscope is provided.
High-sensitivity optical fiber gyroscope is to be divided into two through beam splitter by the light that light source sends, wherein a branch of light enters the multifunction integrated optics chip input end, beam splitter in the multifunction integrated optics chip is divided into light beam up and down to be exported behind two light beams, wherein go up light beam and enter first optical fiber, 2 * 2 acoustooptic switch, when first optical fiber, 2 * 2 acoustooptic switch are opened, the output of last light beam is laggard goes into optical fiber sensing ring, enter second optical fiber, 2 * 2 acoustooptic switch again, this moment, second optical fiber, 2 * 2 acoustooptic switch and first optical fiber, 2 * 2 acoustooptic switch were closed simultaneously, last light beam enters first optical fiber, 2 * 2 acoustooptic switch through second optical fiber, 2 * 2 acoustooptic switch, and then enter the Fibre Optical Sensor ring, and at the Fibre Optical Sensor ring, second optical fiber, 2 * 2 acoustooptic switch, circulate repeatedly in the direction of the clock in the loop that first optical fiber, 2 * 2 acoustooptic switch are formed; Following light beam enters second optical fiber, 2 * 2 acoustooptic switch, when second optical fiber, 2 * 2 acoustooptic switch and first optical fiber, 2 * 2 acoustooptic switch are opened simultaneously, the output of following light beam is laggard goes into optical fiber sensing ring and first optical fiber, 2 * 2 acoustooptic switch, this moment, first optical fiber, 2 * 2 acoustooptic switch and second optical fiber, 2 * 2 acoustooptic switch were closed simultaneously, following light beam enters second optical fiber, 2 * 2 acoustooptic switch through first optical fiber, 2 * 2 acoustooptic switch, and then enter the Fibre Optical Sensor ring, and at the Fibre Optical Sensor ring, first optical fiber, 2 * 2 acoustooptic switch, circulate repeatedly counter clockwise in the loop that second optical fiber, 2 * 2 acoustooptic switch are formed; This two clockwise light of bundle and counter-clockwise light are through after repeatedly circulating, second optical fiber, 2 * 2 acoustooptic switch and first optical fiber, 2 * 2 acoustooptic switch are opened simultaneously, light and counter-clockwise light enter in the multifunction integrated optics chip through second optical fiber, 2 * 2 acoustooptic switch and first optical fiber, 2 * 2 acoustooptic switch respectively clockwise, form interference by the beam splitter in the multifunction integrated optics chip is synthetic, be divided into two through multifunction integrated optics chip input end to beam splitter, wherein a branch ofly become electric signal by photodetector, through signal processing unit, produce feedback and be added in the multifunction integrated optics chip on the phase-modulator, and export the turn signal of gyroscope simultaneously with respect to inertial reference system.
The present invention adopts two low-loss acoustooptic switch, is inserted into respectively between two output ports of integrated optics chip and two ports of Fibre Optical Sensor ring, makes clockwise light and counter-clockwise light repeatedly to circulate in the sensing ring, thereby has increased sensing sensitivity.Because the low-loss that optical fiber 2 * 2 acoustooptic switch have the 0.1dB magnitude if cycle index is 10 times, is compared with the traditional fiber gyro with same fibre sensing ring, sensitivity has increased by 10 times, and the luminous energy loss only increases 2.2dB.The present invention has avoided adopting increase sensing ring length method to increase the big Shupe effect errors that sensitivity brings, and provides cost savings.
Description of drawings
Fig. 1 is the high-sensitivity optical fiber gyroscope structural representation;
Fig. 2 is traditional closed-loop fiber optic gyroscope structural representation.
Embodiment
As shown in Figure 1, high-sensitivity optical fiber gyroscope is to be divided into two through beam splitter 2 by the light that light source 1 sends, wherein a branch of light enters multifunction integrated optics chip 3 input ends, beam splitter in the multifunction integrated optics chip 3 is divided into light beam up and down to be exported behind two light beams, wherein go up light beam and enter first optical fiber, 2 * 2 acoustooptic switch 4, when first optical fiber, 2 * 2 acoustooptic switch 4 are opened, the output of last light beam is laggard goes into optical fiber sensing ring 5, enter second optical fiber, 2 * 2 acoustooptic switch 6 again, this moment, second optical fiber, 2 * 2 acoustooptic switch 6 and first optical fiber, 2 * 2 acoustooptic switch 4 were closed simultaneously, last light beam enters first optical fiber, 2 * 2 acoustooptic switch 4 through second optical fiber, 2 * 2 acoustooptic switch 6, and then enter Fibre Optical Sensor ring 5, and at Fibre Optical Sensor ring 5, second optical fiber, 2 * 2 acoustooptic switch 6, circulate repeatedly in the direction of the clock in the loop that first optical fiber, 2 * 2 acoustooptic switch 4 are formed; Following light beam enters second optical fiber, 2 * 2 acoustooptic switch 6, when second optical fiber, 2 * 2 acoustooptic switch 6 and first optical fiber, 2 * 2 acoustooptic switch 4 are opened simultaneously, the output of following light beam is laggard goes into optical fiber sensing ring 5 and first optical fiber, 2 * 2 acoustooptic switch 4, this moment, first optical fiber, 2 * 2 acoustooptic switch 4 and second optical fiber, 2 * 2 acoustooptic switch 6 were closed simultaneously, following light beam enters second optical fiber, 2 * 2 acoustooptic switch 6 through first optical fiber, 2 * 2 acoustooptic switch 4, and then enter Fibre Optical Sensor ring 5, and at Fibre Optical Sensor ring 5, first optical fiber, 2 * 2 acoustooptic switch 4, circulate repeatedly counter clockwise in the loop that second optical fiber, 2 * 2 acoustooptic switch 6 are formed; This two clockwise light of bundle and counter-clockwise light are through after repeatedly circulating, second optical fiber, 2 * 2 acoustooptic switch 6 and first optical fiber, 2 * 2 acoustooptic switch 4 are opened simultaneously, light and counter-clockwise light enter in the multifunction integrated optics chip 3 through second optical fiber, 2 * 2 acoustooptic switch 6 and first optical fiber, 2 * 2 acoustooptic switch 4 respectively clockwise, form interference by the beam splitter in the multifunction integrated optics chip 3 is synthetic, be divided into two through multifunction integrated optics chip 3 input ends to beam splitter 2, wherein a branch ofly become electric signal by photodetector 7, through signal processing unit 8, produce feedback and be added in the multifunction integrated optics chip 3 on the phase-modulator, and export the turn signal of gyroscope simultaneously with respect to inertial reference system.
Light source of the present invention adopts the Er-doped fiber wide range fluorescence light source of diode-end-pumped, beam splitter 2 is that splitting ratio is 50%: 50% a polarization-maintaining fiber coupler, multifunction integrated optics chip 3 is Y type lithium niobate waveguide chips, wherein input waveguide is integrated with the polarizer, and two waveguide output waveguides are integrated with the push-pull type phase-modulator.First optical fiber, 2 * 2 acoustooptic switch, 4 structures and manufacturing are as follows: with two optical fiber, wherein pre-drawing-down, then that these two diameters are different parallel the putting together of optical fiber, make the zero-signal fiber coupler by drawing awl technology, the cone that promotes with piezoelectric ceramics is installed at coupling mechanism one end, when piezoelectric ceramics did not have plus signal, the zero-signal fiber coupler did not produce coupling; When piezoelectric ceramics added 10MHz, the driving of 1.5 milliwatts, sound wave produced the periodic refractive index disturbance in the coupled zone, will import light by acousto-optic coupling zero-signal fiber coupler and be coupled to another optical fiber fully, and the low-loss of 0.1dB is only arranged.The polarization maintaining optical fibre that Fibre Optical Sensor ring 5 usefulness length are one kilometer is pressed the average 95 millimeters annulus of quadrapole winding coiled, and the structure of second optical fiber, 2 * 2 acoustooptic switch 6 and first optical fiber, 2 * 2 acoustooptic switch 4 is identical.First acoustooptic switch 4 and second optical fiber, 2 * 2 acoustooptic switch 6 are opened simultaneously, clockwise light beam and counter-clockwise light beam are introduced in the Fibre Optical Sensor ring 5 simultaneously, after 5 microseconds (light is propagated the time of a circle in the Fibre Optical Sensor ring), first acoustooptic switch 4 and second optical fiber, 2 * 2 acoustooptic switch 6 are closed simultaneously, light circulates in Fibre Optical Sensor ring 5, circulate after 5 times, first acoustooptic switch 4 and second optical fiber, 2 * 2 acoustooptic switch 6 close again simultaneously to be opened, clockwise light and inhour enter multifunction integrated optics chip 3 synthetic formation through acoustooptic switch and interfere, become electric signal through beam splitter 2 and by photodetector 7, produce feedback through signal processing unit 8 and be added in the multifunction integrated optics chip 3 on the phase-modulator, and export the turn signal of gyroscope simultaneously with respect to inertial reference system.Under identical input signal and device condition, the turn signal amplitude of the fibre optic gyroscope of structure of the present invention output is 5 times without the traditional fiber gyro of acoustooptic switch.
Claims (1)
1. high-sensitivity optical fiber gyroscope, it is characterized in that the light that is sent by light source (1) is divided into two through beam splitter (2), wherein a branch of light enters multifunction integrated optics chip (3) input end, beam splitter in the multifunction integrated optics chip (3) is divided into light beam up and down to be exported behind two light beams, wherein go up light beam and enter first optical fiber, 2 * 2 acoustooptic switch (4), when first optical fiber, 2 * 2 acoustooptic switch (4) are opened, the output of last light beam is laggard goes into optical fiber sensing ring (5), enter second optical fiber, 2 * 2 acoustooptic switch (6) again, this moment, second optical fiber, 2 * 2 acoustooptic switch (6) and first optical fiber, 2 * 2 acoustooptic switch (4) were closed simultaneously, last light beam enters first optical fiber, 2 * 2 acoustooptic switch (4) through second optical fiber, 2 * 2 acoustooptic switch (6), and then enter Fibre Optical Sensor ring (5), and in Fibre Optical Sensor ring (5), second optical fiber, 2 * 2 acoustooptic switch (6), circulate repeatedly in the direction of the clock in the loop that first optical fiber, 2 * 2 acoustooptic switch (4) are formed; Following light beam enters second optical fiber, 2 * 2 acoustooptic switch (6), when second optical fiber, 2 * 2 acoustooptic switch (6) and first optical fiber, 2 * 2 acoustooptic switch (4) when opening simultaneously, the output of following light beam is laggard goes into optical fiber sensing ring (5) and first optical fiber, 2 * 2 acoustooptic switch (4), this moment, first optical fiber, 2 * 2 acoustooptic switch (4) and second optical fiber, 2 * 2 acoustooptic switch (6) were closed simultaneously, following light beam enters second optical fiber, 2 * 2 acoustooptic switch (6) through first optical fiber, 2 * 2 acoustooptic switch (4), and then enter Fibre Optical Sensor ring (5), and in Fibre Optical Sensor ring (5), first optical fiber, 2 * 2 acoustooptic switch (4), circulate repeatedly counter clockwise in the loop that second optical fiber, 2 * 2 acoustooptic switch (6) are formed; This two clockwise light of bundle and counter-clockwise light are through after repeatedly circulating, second optical fiber, 2 * 2 acoustooptic switch (6) and first optical fiber, 2 * 2 acoustooptic switch (4) are opened simultaneously, light and counter-clockwise light enter in the multifunction integrated optics chip (3) through second optical fiber, 2 * 2 acoustooptic switch (6) and first optical fiber, 2 * 2 acoustooptic switch (4) respectively clockwise, form interference by the beam splitter in the multifunction integrated optics chip (3) is synthetic, be divided into two through multifunction integrated optics chip (3) input end to beam splitter (2), wherein a branch ofly become electric signal by photodetector (7), through signal processing unit (8), produce feedback and be added on the middle phase-modulator of multifunction integrated optics chip (3), and export the turn signal of gyroscope simultaneously with respect to inertial reference system.
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| CN2009101540237A CN101694386B (en) | 2009-10-22 | 2009-10-22 | High-sensitivity optical fiber gyroscope |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012141746A1 (en) * | 2011-01-28 | 2012-10-18 | Massachusetts Institute Of Technology | Recycled light interferometric fiber optic gyroscope |
| CN103645592A (en) * | 2013-12-13 | 2014-03-19 | 中国电子科技集团公司第四十一研究所 | Novel integrated optical waveguide device for fiber-optic gyroscope |
| CN103940415A (en) * | 2014-03-26 | 2014-07-23 | 同济大学 | Polarization-maintaining fiber sensing loop structure of fiber optic gyroscope |
| CN104634340A (en) * | 2015-01-27 | 2015-05-20 | 浙江大学 | Optical fiber gyro for eliminating heat effect |
| CN105021180A (en) * | 2015-07-30 | 2015-11-04 | 哈尔滨工程大学 | Optical fiber gyroscope with optical fiber ring adopting double-ring design |
| CN105973222A (en) * | 2016-06-17 | 2016-09-28 | 同济大学 | Sagnac phase shifting multiplication structure of interferometric fiber-optic gyroscope |
| CN107167878A (en) * | 2017-06-09 | 2017-09-15 | 广东省智能机器人研究院 | A kind of integrated Integral sound/light switch of full glass |
| CN107328404A (en) * | 2017-07-28 | 2017-11-07 | 同济大学 | The super large Sagnac interference optical fiber tops of effective fiber length N multiplications |
| CN110360997A (en) * | 2019-06-28 | 2019-10-22 | 浙江大学 | A kind of detection system and method for time-multiplexed resonance type optical gyroscope |
| CN110426027A (en) * | 2019-08-09 | 2019-11-08 | 浙江大学 | A kind of fibre optic gyroscope and its method of the realization multi-turn detour based on magneto-optic shutter |
| WO2022000760A1 (en) * | 2020-07-03 | 2022-01-06 | 浙江大学 | Multiple optical multiplication device and method for polarization maintaining optical fiber coil |
| CN114844574A (en) * | 2022-07-04 | 2022-08-02 | 浙江大学湖州研究院 | Optical fiber communication system and communication method |
| CN116045945A (en) * | 2023-03-31 | 2023-05-02 | 中国船舶集团有限公司第七〇七研究所 | Photoelectric control method and device for optical fiber gyro rotation modulation |
-
2009
- 2009-10-22 CN CN2009101540237A patent/CN101694386B/en not_active Expired - Fee Related
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012141746A1 (en) * | 2011-01-28 | 2012-10-18 | Massachusetts Institute Of Technology | Recycled light interferometric fiber optic gyroscope |
| CN103645592A (en) * | 2013-12-13 | 2014-03-19 | 中国电子科技集团公司第四十一研究所 | Novel integrated optical waveguide device for fiber-optic gyroscope |
| CN103645592B (en) * | 2013-12-13 | 2016-05-25 | 中国电子科技集团公司第四十一研究所 | A kind of Novel optical fiber gyro integrated optical wave guide device |
| CN103940415A (en) * | 2014-03-26 | 2014-07-23 | 同济大学 | Polarization-maintaining fiber sensing loop structure of fiber optic gyroscope |
| CN104634340B (en) * | 2015-01-27 | 2017-06-23 | 浙江大学 | Eliminate the fibre optic gyroscope of fuel factor |
| CN104634340A (en) * | 2015-01-27 | 2015-05-20 | 浙江大学 | Optical fiber gyro for eliminating heat effect |
| CN105021180B (en) * | 2015-07-30 | 2018-04-24 | 哈尔滨工程大学 | A kind of fiber optic loop uses the optical fibre gyro of loop design |
| CN105021180A (en) * | 2015-07-30 | 2015-11-04 | 哈尔滨工程大学 | Optical fiber gyroscope with optical fiber ring adopting double-ring design |
| CN105973222A (en) * | 2016-06-17 | 2016-09-28 | 同济大学 | Sagnac phase shifting multiplication structure of interferometric fiber-optic gyroscope |
| CN107167878A (en) * | 2017-06-09 | 2017-09-15 | 广东省智能机器人研究院 | A kind of integrated Integral sound/light switch of full glass |
| CN107167878B (en) * | 2017-06-09 | 2023-07-07 | 广东省智能机器人研究院 | All-glass integrated acousto-optic switch |
| CN107328404B (en) * | 2017-07-28 | 2020-07-28 | 同济大学 | Oversized Sagnac interference type fiber-optic gyroscope with N-multiplied effective fiber-optic length |
| CN107328404A (en) * | 2017-07-28 | 2017-11-07 | 同济大学 | The super large Sagnac interference optical fiber tops of effective fiber length N multiplications |
| CN110360997A (en) * | 2019-06-28 | 2019-10-22 | 浙江大学 | A kind of detection system and method for time-multiplexed resonance type optical gyroscope |
| CN110360997B (en) * | 2019-06-28 | 2021-06-01 | 浙江大学 | Detection system and method of time division multiplexing resonant optical gyroscope |
| CN110426027A (en) * | 2019-08-09 | 2019-11-08 | 浙江大学 | A kind of fibre optic gyroscope and its method of the realization multi-turn detour based on magneto-optic shutter |
| CN110426027B (en) * | 2019-08-09 | 2021-04-20 | 浙江大学 | Optical fiber gyroscope for realizing multi-turn winding based on magneto-optical switch and method thereof |
| WO2022000760A1 (en) * | 2020-07-03 | 2022-01-06 | 浙江大学 | Multiple optical multiplication device and method for polarization maintaining optical fiber coil |
| CN114844574A (en) * | 2022-07-04 | 2022-08-02 | 浙江大学湖州研究院 | Optical fiber communication system and communication method |
| CN116045945A (en) * | 2023-03-31 | 2023-05-02 | 中国船舶集团有限公司第七〇七研究所 | Photoelectric control method and device for optical fiber gyro rotation modulation |
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| CN101694386B (en) | 2011-04-27 |
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