CN101782595A - Multiplexing fiber-optic inertial sensing unit capable of simultaneously measuring acceleration and palstance - Google Patents
Multiplexing fiber-optic inertial sensing unit capable of simultaneously measuring acceleration and palstance Download PDFInfo
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- CN101782595A CN101782595A CN 201010106375 CN201010106375A CN101782595A CN 101782595 A CN101782595 A CN 101782595A CN 201010106375 CN201010106375 CN 201010106375 CN 201010106375 A CN201010106375 A CN 201010106375A CN 101782595 A CN101782595 A CN 101782595A
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Abstract
The invention discloses a multiplexing fiber-optic inertial sensing unit capable of simultaneously measuring acceleration and palstance. A lower end is placed on the middle part of a groove of a fiber-optic ring stand through a flexible board supported by a metal bracket; a gyro ring is coiled outside the fiber-optic ring stand; a below-board accelerometer ring is clockwise coiled and fixed below the flexible board; an above-board accelerometer ring is counterclockwise coiled and fixed above the flexible board; a below-board accelerometer ring inner-circle tail fiber is connected with a tail fiber at one end of the gyro ring to form a first soldering point; an above-board accelerometer ring inner-circle tail fiber is connected with the tail fiber at the other end of the gyro ring to form a second soldering point; and the below-board accelerometer ring inner-circle tail fiber and the above-board accelerometer ring inner-circle tail fiber are connected with the two light emitting ends of a Y wave guide. In the multiplexing fiber-optic inertial sensing unit, the inertial sensing units of a fiber optic gyro and an accelerometer are integrated onto one ring stand, which improves the reliability of a system, minimizes the system and reduces the cost of the system. As the inertial sensing unit has an all-fiber structure, the stability of the system is greatly improved.
Description
Technical field
The present invention relates to optical fiber and sensory field, particularly relate to the simultaneously-measured multiplexing fiber-optic inertial sensing unit of a kind of realization acceleration and angular velocity.
Background technology
Fibre optic gyroscope and accelerometer are used in combination, and have realized the measurement of acceleration and angular velocity, at wide spectrums such as navigation, system stabilities important use are arranged.For the system of use optical fibre gyro and accelerometer, reliability and very crucial to the stability of environmental change, and the miniaturization of this system is the trend of development.Traditional system is because made by optical fibre gyro and accelerometer discrete device, and not only cost height, volume are big, and reliability is also lower.The present invention is by adopting a multiplexing fiber-optic inertial sensing unit, and the inertia sensing unit of fibre optic gyroscope and accelerometer is integrated on the toroidal frame, improved the reliability of system, makes system's miniaturization, and reduced the cost of system.
Summary of the invention
The object of the present invention is to provide the simultaneously-measured multiplexing fiber-optic inertial sensing unit of a kind of realization acceleration and angular velocity, by adopting a multiplexing fiber-optic inertial sensing unit, the inertia sensing unit of fibre optic gyroscope and accelerometer is integrated on the optical fiber ring stand, improved the reliability of system, made system's miniaturization.
The technical solution used in the present invention is:
Comprise the optical fiber ring stand, flexible board, metal support, accelerometer ring under the plate, accelerometer ring and gyro ring on the plate; The flexible board that the lower end is supported by metal support places in the middle of the groove of optical fiber ring stand, and the gyro ring is coiled in the outside of optical fiber ring stand, and the accelerometer ring coils and be fixed on the flexible board below clockwise under the plate; The accelerometer ring coils and is fixed on the flexible board top counterclockwise on the plate, and accelerometer ring inner ring tail optical fiber links to each other with gyro ring one end tail optical fiber under the plate, forms first pad; Accelerometer ring inner ring tail optical fiber links to each other with gyro ring other end tail optical fiber on the plate, forms second pad, under the plate on accelerometer ring outer ring tail optical fiber and the plate accelerometer ring outer ring tail optical fiber be connected with two bright dipping ends of Y waveguide respectively.
Under the described plate accelerometer ring ring long with plate on accelerometer ring ring ratio long and that gyro ring ring is long be 1: 1: 2.
The reflectivity of described first pad, second pad is chosen for and makes reflection equate that with the intensity of twice transmission promptly reflectivity is 0.382, and refractive index is 0.618.
The beneficial effect that the present invention has is:
The inertia sensing unit of fibre optic gyroscope and accelerometer is integrated on the toroidal frame, has improved the reliability of system, make system's miniaturization, and reduced the cost of system.Because the inertia sensing unit is an all optical fibre structure, improved the stability of system greatly in addition.
Description of drawings
Fig. 1 realizes acceleration and the simultaneously-measured multiplexing fiber-optic inertial sensing unit of angular velocity synoptic diagram.
Fig. 2 realizes acceleration and the whole light path synoptic diagram of the simultaneously-measured multiplexing fiber-optic inertial sensing unit of angular velocity.
Fig. 3 is a signal phase synoptic diagram when adopting the long eigenfrequency of loopful to modulate; (a), gyroscope signal optical modulation time delay, (b), the gyroscope signal light phase is poor, (c), Mach-Zehnder interferometer flashlight modulation time delay, (d), Mach-Zehnder interferometer flashlight phase differential.
Fig. 4 is a signal phase synoptic diagram when adopting the long eigenfrequency of twice loopful to modulate; (a), Mach-Zehnder interferometer flashlight modulation time delay, (b), Mach-Zehnder interferometer flashlight phase differential, (c), gyroscope signal optical modulation time delay, (d), the gyroscope signal light phase is poor.
Among the figure: 1, optical fiber ring stand, 2, flexible board, 3, metal support, 4, accelerometer ring under the plate, 5, accelerometer ring on the plate, 6, the gyro ring, 7, gyro ring one end tail optical fiber, 8, gyro ring other end tail optical fiber, 9, accelerometer ring inner ring tail optical fiber under the plate, 10, accelerometer ring inner ring tail optical fiber on the plate, 11, first pad, 12, second pad, 13, accelerometer ring outer ring tail optical fiber under the plate, 14, accelerometer ring outer ring tail optical fiber on the plate, 15, SLD light source, 16, coupling mechanism, 17, Y waveguide, 18, the PIN detector.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
As shown in Figure 1, the present invention includes optical fiber ring stand 1, flexible board 2, metal support 3, accelerometer ring 4 under the plate, accelerometer ring 5 and gyro ring 6 on the plate; The flexible board 2 that the lower end is supported by metal support 3 places in the middle of the groove of optical fiber ring stand 1, and gyro ring 6 is coiled in the outside of optical fiber ring stand (1), and accelerometer ring 4 coils and be fixed on flexible board 2 belows clockwise under the plate; Accelerometer ring 5 coils and is fixed on flexible board 2 tops counterclockwise on the plate, and accelerometer ring inner ring tail optical fiber 9 links to each other with gyro ring one end tail optical fiber 7 under the plate, forms first pad 11; Accelerometer ring inner ring tail optical fiber 10 links to each other with gyro ring other end tail optical fiber 8 on the plate, forms second pad 12, under the plate on accelerometer ring outer ring tail optical fiber 13 and the plate accelerometer ring outer ring tail optical fiber 14 be connected with 7 two bright dipping ends of Y waveguide respectively.
Under the described plate accelerometer ring 4 ring long with plate on accelerometer ring 5 rings ratios long and that gyro ring 6 rings are long be 1: 1: 2.
The reflectivity of described first pad 11, second pad 12 is chosen for and makes reflection equate that with the intensity of twice transmission promptly reflectivity is 0.382, and refractive index is 0.618.The realization of reflectivity is obtained to utilize multiplex technique to obtain by artificial mismatch in the optical fiber welding process by bonding machine.
The present invention is with the principles illustrated of a Mach-Zehnder interferometer accelerometer and a fibre optic gyroscope.Wherein under the plate on accelerometer ring 4 and the plate accelerometer ring 5 form two arms of Mach-Zehnder interferometers, the Mach-Zehnder interferometer signal utilizes the reflected light of first pad 11, second pad 12 to interfere and obtains, and realizes the measurement to acceleration; Gyro ring 6 is gyrostatic building ring, and gyroscope signal utilizes the transmitted light of first pad 11, second pad 12 to interfere and obtains, and realizes the measurement to angular velocity.Because reflectivity is selected, two kinds of signal light intensities are identical.
Be coiled in flexible board 2 belows clockwise by accelerometer ring 4 under the plate, accelerometer ring 5 is coiled in flexible board 2 tops counterclockwise on the plate, makes Mach-Zehnder interferometer not produce the sagnac effect.
Be illustrated in figure 2 as a kind of whole light path that realizes acceleration and the simultaneously-measured multiplexing fiber-optic inertial sensing unit of angular velocity.Light is from SLD light source 15, through coupling mechanism 16, divides optical modulation in Y waveguide 17, and two-beam passes through respectively under the plate on the accelerometer ring 4 and plate behind the accelerometer ring 5, respectively in first pad 11 and 12 reflection and the transmissions of second pad.Two bundle reflected light return the back interferes, and returns at last in the PIN detector 18; Two bundle transmitted lights continue through gyro ring 6, interfere through 4 backs of accelerometer ring under accelerometer ring 5 on the plate and the plate respectively again, return at last in the PIN detector 18.
A kind of whole light path that realizes acceleration and the simultaneously-measured multiplexing fiber-optic inertial sensing unit of angular velocity realizes modulation to Mach-Zehnder interferometer and fibre optic gyroscope signal respectively by frequency difference that Y waveguide 3 adds.
The modulating frequency of Y waveguide is the long eigenfrequency of all rings, this moment is concerning gyroscope signal, time delay after the two-beam modulation is shown in Fig. 3 (a), the phase differential that obtains two-beam is shown in Fig. 3 (b), and when static, the two-beam phase differential is ± pi/2, concerning the Mach-Zehnder interferometer signal, time delay after the two-beam modulation is shown in Fig. 3 (c), and the phase differential that obtains two-beam is shown in Fig. 3 (d), and the two-beam phase differential changes between ± pi/2 and 0; The fiber-optic inertial sensing unit quickens or when rotatablely moving, gyroscope is operated in the range of linearity, Mach-Zehnder interferometer signal two-beam phase differential is identical when static, then get Mach-Zehnder interferometer flashlight phase differential and be 0 period demodulation, to eliminate Mach-Zehnder interferometer, realize accurate measurement to angular velocity to gyrostatic influence.
The modulating frequency of Y waveguide is the long eigenfrequencies of all rings of twice, this moment is concerning the Mach-Zehnder interferometer signal, time delay after the two-beam modulation is shown in Fig. 4 (a), the phase differential that obtains two-beam is shown in Fig. 4 (b), and when static, the two-beam phase differential is ± pi/2, concerning gyroscope signal, time delay after the two-beam modulation is shown in Fig. 4 (c), and the phase differential that obtains two-beam is shown in Fig. 4 (d), and the two-beam phase differential is 0; The fiber-optic inertial sensing unit quickens or when rotatablely moving, the online property of Mach-Zehnder interferometer signal work zone, and the small phase differential of gyroscope signal is little to the Mach-Zehnder interferometer influence, and acceleration is accurately measured.
Claims (3)
1. realize acceleration and the simultaneously-measured multiplexing fiber-optic inertial sensing unit of angular velocity for one kind, it is characterized in that: comprise optical fiber ring stand (1), flexible board (2), metal support (3), accelerometer ring (4) under the plate, accelerometer ring (5) and gyro ring (6) on the plate; The flexible board (2) that the lower end is supported by metal support (3) places in the middle of the groove of optical fiber ring stand (1), and gyro ring (6) is coiled in the outside of optical fiber ring stand (1), and accelerometer ring (4) coils and be fixed on flexible board (2) below clockwise under the plate; Accelerometer ring (5) coils and is fixed on flexible board (2) top counterclockwise on the plate, and accelerometer ring inner ring tail optical fiber (9) links to each other with gyro ring one end tail optical fiber (7) under the plate, forms first pad (11); Accelerometer ring inner ring tail optical fiber (10) links to each other with gyro ring other end tail optical fiber (8) on the plate, form second pad (12), under the plate on accelerometer ring outer ring tail optical fiber (13) and the plate accelerometer ring outer ring tail optical fiber (14) be connected with (7) two bright dipping ends of Y waveguide respectively.
2. a kind of realization acceleration according to claim 1 and the simultaneously-measured multiplexing fiber-optic inertial sensing unit of angular velocity is characterized in that: under the described plate accelerometer ring (4) ring long with plate on accelerometer ring (5) ring ratio long and that gyro ring (6) ring is long be 1: 1: 2.
3. a kind of realization acceleration according to claim 1 and the simultaneously-measured multiplexing fiber-optic inertial sensing unit of angular velocity, it is characterized in that: the reflectivity of described first pad (11), second pad (12) is chosen for and makes reflection equate with the intensity of twice transmission, be that reflectivity is 0.382, refractive index is 0.618.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010106375 CN101782595B (en) | 2010-02-02 | 2010-02-02 | Multiplexing fiber-optic inertial sensing unit capable of simultaneously measuring acceleration and palstance |
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| CN 201010106375 CN101782595B (en) | 2010-02-02 | 2010-02-02 | Multiplexing fiber-optic inertial sensing unit capable of simultaneously measuring acceleration and palstance |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102095891A (en) * | 2010-11-09 | 2011-06-15 | 浙江大学 | Optical fiber coil component insensitive to temperatures for acceleration sensor |
| CN102226699A (en) * | 2011-04-11 | 2011-10-26 | 浙江大学 | All-fiber inertial sensing device |
| CN102305628A (en) * | 2011-05-20 | 2012-01-04 | 浙江大学 | Triaxial integrated all-optical-fiber inertial sensing system |
| CN102507968A (en) * | 2011-11-09 | 2012-06-20 | 浙江大学 | Low-creep optical fiber disk for optical fiber accelerometer and manufacturing method thereof |
| CN102621347A (en) * | 2012-03-21 | 2012-08-01 | 浙江大学 | Reflective optical fiber accelerometer compatible with optical fiber gyroscope |
| CN108548939A (en) * | 2018-03-26 | 2018-09-18 | 刘正勇 | Fibre optic accelerometer based on SAGNAC interferometers and vibration detection device |
| CN108645405A (en) * | 2018-04-09 | 2018-10-12 | 浙江大学 | A kind of inertia sensing unit that optical gyroscope is merged with accelerometer height |
| CN111308125A (en) * | 2020-02-24 | 2020-06-19 | 北京大学 | Acceleration detection method based on optical fiber Sagnac interferometer and acceleration meter |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1307404C (en) * | 2003-01-28 | 2007-03-28 | 电子科技大学 | Interference type optical fiber gyroscope based on MZ interference principle |
| CN100357742C (en) * | 2005-06-03 | 2007-12-26 | 中国科学院上海光学精密机械研究所 | Acceleration transducer |
| CN101261127A (en) * | 2007-03-08 | 2008-09-10 | 电子科技大学 | MZ resonance interference principle optical fiber gyro |
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2010
- 2010-02-02 CN CN 201010106375 patent/CN101782595B/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102095891A (en) * | 2010-11-09 | 2011-06-15 | 浙江大学 | Optical fiber coil component insensitive to temperatures for acceleration sensor |
| CN102226699A (en) * | 2011-04-11 | 2011-10-26 | 浙江大学 | All-fiber inertial sensing device |
| CN102226699B (en) * | 2011-04-11 | 2012-09-26 | 浙江大学 | All-fiber inertial sensing device |
| CN102305628A (en) * | 2011-05-20 | 2012-01-04 | 浙江大学 | Triaxial integrated all-optical-fiber inertial sensing system |
| CN102305628B (en) * | 2011-05-20 | 2013-06-12 | 浙江大学 | Triaxial integrated all-optical-fiber inertial sensing system |
| CN102507968A (en) * | 2011-11-09 | 2012-06-20 | 浙江大学 | Low-creep optical fiber disk for optical fiber accelerometer and manufacturing method thereof |
| CN102507968B (en) * | 2011-11-09 | 2014-05-07 | 浙江大学 | Low-creep optical fiber disk for optical fiber accelerometer and manufacturing method thereof |
| CN102621347A (en) * | 2012-03-21 | 2012-08-01 | 浙江大学 | Reflective optical fiber accelerometer compatible with optical fiber gyroscope |
| CN102621347B (en) * | 2012-03-21 | 2013-11-13 | 浙江大学 | Reflective optical fiber accelerometer compatible with optical fiber gyroscope |
| CN108548939A (en) * | 2018-03-26 | 2018-09-18 | 刘正勇 | Fibre optic accelerometer based on SAGNAC interferometers and vibration detection device |
| CN108645405A (en) * | 2018-04-09 | 2018-10-12 | 浙江大学 | A kind of inertia sensing unit that optical gyroscope is merged with accelerometer height |
| CN111308125A (en) * | 2020-02-24 | 2020-06-19 | 北京大学 | Acceleration detection method based on optical fiber Sagnac interferometer and acceleration meter |
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| CN101782595B (en) | 2011-06-22 |
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