CN116045952B - Polarization maintaining fiber-optic gyroscope and peak removing method thereof - Google Patents
Polarization maintaining fiber-optic gyroscope and peak removing method thereof Download PDFInfo
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- CN116045952B CN116045952B CN202310338235.0A CN202310338235A CN116045952B CN 116045952 B CN116045952 B CN 116045952B CN 202310338235 A CN202310338235 A CN 202310338235A CN 116045952 B CN116045952 B CN 116045952B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/58—Turn-sensitive devices without moving masses
- G01C19/64—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams
- G01C19/72—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams with counter-rotating light beams in a passive ring, e.g. fibre laser gyrometers
Abstract
The invention relates to the technical field of fiber optic gyroscope precision control, in particular to a polarization maintaining fiber optic gyroscope and a spike removing method thereof, S1, a detection light path passing through a primary coupler is divided into two paths by a secondary coupler, the first path of detection light path passes through a first path detector circuit, and the second path of detection light path passes through a second path detector circuit; s2, in the second path detector circuit in the step S1, signal delay occurs between a detection signal passing through the second path detector and a detection signal passing through the first path detector through optical path extension; s3, subtracting the detection signal passing through the first path of detector from the detection signal passing through the second path of detector to obtain a sensitive angular velocity differential signal. The method can effectively remove the influence of the peak on the detection result, reasonably reserves the signal of the peak corresponding to the corresponding moment, and ensures that the detection result is more accurate.
Description
Technical Field
The invention relates to the technical field of precision control of fiber optic gyroscopes, in particular to a polarization maintaining fiber optic gyroscope and a spike removing method thereof.
Background
The fiber optic gyroscope has the advantages of high reliability, impact vibration resistance, long service life, high starting speed and the like as a novel optical gyroscope instrument, and is widely applied to a plurality of military and civil fields. The existing fiber optic gyroscope comprises a light source, a primary coupler, a Y waveguide and a fiber optic coil, wherein the light source leads light signals into the Y waveguide through the primary coupler, leads the fiber optic coil from the Y waveguide, leads the light signals back to the Y waveguide through the fiber optic coil, and leads the light signals into the primary coupler through the Y waveguide, and then the light signals enter a detector through a detection light path of the primary coupler. The detector obtains the periodic signal of the evidence, the periodic signal of the evidence at the first moment needs to be subtracted from the periodic signal of the evidence at the last moment, so that a sensitive angular velocity differential signal is obtained, and because of the problem of the internal element of the fiber-optic gyroscope, spike signals exist between adjacent periodic signals of the evidence, and the signals are error signals and influence the detection result.
The existing method is to introduce a switching signal in the correlation evidence period of spike signal generation, namely, the detection signal is turned off at the moment of spike signal generation, so that the normally detected signal in the correlation moment of spike signal generation is lost, and the detection result is inaccurate.
Disclosure of Invention
The present invention is directed to solving at least one of the technical problems existing in the related art. Therefore, the invention provides a method for removing spike signals, which is capable of enabling detection results to be accurate without detecting signal switching-off.
The invention provides a spike removing method based on a polarization maintaining fiber optic gyroscope, which comprises the following steps:
s1, dividing a detection light path passing through a primary coupler into two paths through a secondary coupler, wherein the first path of detection light path passes through a first path of detector circuit, and the second path of detection light path passes through a second path of detector circuit;
s2, in the second path detector circuit in the step S1, signal delay occurs between a detection signal passing through the second path detector and a detection signal passing through the first path detector through optical path extension;
s3, subtracting the detection signal passing through the first path of detector from the detection signal passing through the second path of detector in the same time, wherein the time length is an intrinsic period, and obtaining a sensitive angular velocity differential signal.
The optical path extension distance in step S2 provided according to the present invention is a multiple of the optical path length in the optical fiber coil of the optical fiber gyro.
The optical path extension of step S2 provided according to the present invention is obtained by an extension fiber optic loop connected in the second detector circuit, the fiber length of the extension fiber optic loop being a multiple of the fiber length of the fiber optic loop of the fiber optic gyroscope.
In the step S3 provided by the invention, the subtraction of the detection signal passing through the second path detector and the detection signal passing through the first path detector is realized through the FPGA.
The invention also provides a polarization maintaining fiber-optic gyroscope, which comprises a light source, a primary coupler, a Y waveguide and an optical fiber coil, wherein the light source leads light signals into the Y waveguide through the primary coupler, leads the light signals into the optical fiber coil from the Y waveguide, leads the light signals back to the Y waveguide through the optical fiber coil, leads the light signals into the primary coupler through the Y waveguide, passes through a detection light path of the primary coupler, and is respectively connected with a first path detector circuit and a second path detector circuit after passing through the secondary coupler, and the second path detector circuit is provided with a light path extender.
The optical path extender provided in accordance with the present invention includes an elongated fiber loop having a fiber length that is a multiple of the fiber length of the fiber loop.
The length of the optical fiber in the extended optical fiber ring is equal to that of the optical fiber ring.
According to the invention, a plurality of extension optical fiber loops are provided, and the plurality of extension optical fiber loops are different multiples of the optical fiber length of the optical fiber loops, and one of the plurality of extension optical fiber loops is connected into a second path detector circuit through switching.
The above technical solutions in the embodiments of the present invention have at least one of the following technical effects:
the detection light paths are respectively detected by adopting a light path delay method, the two detection light paths only have changes in the light path length, that is to say, the detection result of the corresponding detection light paths only has delay, and the detection signal of the second path detector is subtracted from the detection signal of the first path detector to obtain a sensitive angular velocity differential signal, so that the subtraction of normal detection signals and the subtraction of spike signals are realized, and the spike signals are generated by elements of the fiber-optic gyroscope, so that the influence of the spike on the detection result can be effectively eliminated by subtracting the two different intrinsic periodic signals, the signal of the spike corresponding to the corresponding moment is reasonably reserved, and the detection result is more accurate.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the connection of the polarization maintaining fiber optic gyroscope structure according to the present invention.
FIG. 2 is a schematic view of an optical path extender provided by the present invention that extends the optical fiber length of an optical fiber loop to the same length as the optical fiber length of the optical fiber loop.
FIG. 3 is a schematic view of an optical path extender provided by the invention for extending the optical fiber length of an optical fiber loop by different multiples of the optical fiber length of the optical fiber loop.
Fig. 4 is a schematic diagram of FPGA data processing and gyro control provided by the present invention.
FIG. 5 is a schematic diagram showing the comparison of signals from a first detector and a second detector when an extended fiber loop with the same fiber length as that of a fiber coil is connected.
FIG. 6 is a schematic diagram showing a comparison of signals from a first detector and a second detector when an extended fiber loop with a fiber length 2 times that of a fiber coil is connected.
Reference numerals:
1. the optical fiber circuit comprises a light source, a primary coupler, a 3.Y waveguide, a fiber coil, a secondary coupler, a first path detector, a 7 path extender, a second path detector, a 9 switch, a 10 path amplifier, a 11 path AD digital-to-analog converter, a 12 path amplifier, a 13 path AD digital-to-analog converter, a 14 path fiber loop extender, a 15 DA analog-to-digital converter, a 16 path gyro control amplifier and a 17.Y waveguide control electrode.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. The following examples are illustrative of the invention but are not intended to limit the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In describing embodiments of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "coupled," "coupled," and "connected" should be construed broadly, and may be either a fixed connection, a removable connection, or an integral connection, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in embodiments of the present invention will be understood in detail by those of ordinary skill in the art.
In embodiments of the invention, unless expressly specified and limited otherwise, a first feature "up" or "down" on a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
The following describes a polarization maintaining fiber-optic gyroscope and a spike removing method thereof in accordance with the present invention with reference to fig. 1 to 6.
As shown in fig. 1, a polarization maintaining fiber-optic gyroscope comprises a light source 1, a primary coupler 2, a Y waveguide 3 and an optical fiber coil 4, wherein the light source 1 transmits light signals through the primary coupler 2, enters the Y waveguide 3, is led into the optical fiber coil 4 from the Y waveguide 3, is led out and returns to the Y waveguide 3 through the optical fiber coil 4, enters the primary coupler 2 through the Y waveguide 3, passes through a detection light path of the primary coupler 2, and is respectively connected with a first path of detector circuit and a second path of detector circuit after passing through a secondary coupler 5, and the second path of detector circuit is provided with a light path extender 7.
The optical path extender, as shown in fig. 2 and 3, includes an elongated fiber loop 14 having a fiber length that is a multiple of the fiber length of the fiber loop.
The length of the optical fiber in the extended fiber optic loop is equal to the length of the optical fiber of the fiber optic loop as described in fig. 2 and 5. In FIG. 5, the upper signal is the detection signal of the first path detector 6, and the lower signal is the detection signal of the second path detector 8, and at this time, the second path detector delays by one eigenperiod corresponding to the first path detector due to the increase of the optical path and the extension of the optical fiber length in the optical fiber loop 14 to be equal to the optical fiber length of the optical fiber loop
Intrinsic circumferenceStage->
For the transmission time of light in the optical fiber coil, the signals of the second path detector and the first path detector are acquired at the same time, and the second path detector obtains +.>
、/>
、/>
、/>
、…、/>
The first detector is provided with ∈>
、/>
、/>
、/>
、…、/>
，/>
Represents the ith eigenperiod, with one of the same time (time length +.>
) The detection signal passing through the first path detector is subtracted from the detection signal passing through the second path detector to obtain
Wherein->
Is a sensitive angular velocity differential signal.
The number of the extension fiber loops is a plurality as shown in fig. 3, and the plurality of the extension fiber loops are different multiples of the optical fiber length of the fiber loops, and one of the plurality of the extension fiber loops is connected to the second path detector circuit by switching through the switch 9. In FIG. 6, the upper signal is the first path of detector detection signal, the lower signal is the second path of detector detection signal, and at this time, due to the increase of the optical path and the extension of the optical fiber length in the optical fiber loop is 2 times of the optical fiber length of the optical fiber loop, the second path of detector corresponds to the first path of detector delay of two eigenperiods
The signals of the second path detector and the first path detector are acquired at the same time, and the second path detector obtains +.>
、/>
、/>
、/>
、…、/>
The first detector is provided with ∈>
、/>
、/>
、…、/>
，/>
Represents the ith eigenperiod, with one of the same time (time length +.>
) The detection signal passing through the first path detector is subtracted from the detection signal passing through the second path detector to obtain
Wherein->
The differential signal is sensitive to angular velocity, and the differential signal is equivalent to the difference of a plurality of period detection signal data, so that noise can be effectively reduced, and the precision is improved.
As shown in fig. 4, the first path of detector passes through the first path of amplifier 10, the first path of AD digital-to-analog converter 11 enters the FPGA to perform data processing, the second path of detector passes through the second path of amplifier 12, the second path of AD digital-to-analog converter 13 also enters the FPGA, the detection signals passing through the first path of detector and the detection signals passing through the second path of detector are subtracted in the FPGA, and then output
. And the signals after being processed by the FPGA data enter a DA analog-to-digital converter 15, are amplified by a gyro control amplifier 16 and then are transmitted into a Y waveguide control electrode 17, so that the Y waveguide 3 is feedback controlled. The influence of the peak on the detection result is effectively eliminated, and the signal of the peak corresponding to the corresponding moment is reasonably reserved, so that the detection result is more accurate.
The detection light paths are respectively detected by adopting a light path delay method, the two detection light paths only have changes in the light path length, that is to say, the detection result of the corresponding detection light paths only has delay, and the detection signal of the second path detector is subtracted from the detection signal of the first path detector to obtain a sensitive angular velocity differential signal, so that the subtraction of normal detection signals and the subtraction of spike signals are realized, and the spike signals are generated by elements of the fiber-optic gyroscope, so that the influence of the spike on the detection result can be effectively eliminated by subtracting the two different intrinsic periodic signals, the signal of the spike corresponding to the corresponding moment is reasonably reserved, and the detection result is more accurate.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (2)
1. The spike removing method based on the polarization maintaining fiber optic gyroscope comprises a light source, a primary coupler, a Y waveguide and an optical fiber coil, wherein the light source leads light signals into the Y waveguide through the primary coupler, leads the light signals into the optical fiber coil from the Y waveguide, leads the light signals back to the Y waveguide through the optical fiber coil, and leads the light signals into the primary coupler through the Y waveguide, and respectively inputs the light signals into a first path detector circuit and a second path detector circuit after passing through a detection light path of the primary coupler through the secondary coupler, and the second path detector circuit is provided with a light path extender, and the spike removing method is characterized by comprising the following steps:
s1, dividing a detection light path passing through a primary coupler into two paths through a secondary coupler, wherein the first path of detection light path passes through a first path of detector circuit, and the second path of detection light path passes through a second path of detector circuit;
s2, in the second path detector circuit in the step S1, signal delay occurs between a detection signal passing through the second path detector and a detection signal passing through the first path detector through optical path extension, wherein the optical path extension is obtained through an extension optical fiber ring connected in the second path detector circuit, and the optical fiber length of the extension optical fiber ring is a multiple of the optical fiber length of an optical fiber coil of the optical fiber gyro;
s3, in the same time, the time length is an intrinsic period, the intrinsic period is the transmission time of light in the optical fiber coil, and the detection signal passing through the first path of detector is subtracted from the detection signal passing through the second path of detector, so that a sensitive angular velocity differential signal is obtained.
2. The spike removing method based on the polarization maintaining fiber optic gyroscope according to claim 1, wherein in the step S3, the subtraction of the detection signal passing through the second path detector and the detection signal passing through the first path detector is implemented by an FPGA.
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| CN102230828B (en) * | 2011-04-07 | 2012-08-08 | 华东师范大学 | Method for detecting gigahertz single photon with low time jitter and low noise |
| CN103411598B (en) * | 2013-07-24 | 2016-05-18 | 北京航空航天大学 | A kind of two interferometric fiber optic gyroscopes 2 π resetting voltage measuring methods based on light path difference |
| CN104567957B (en) * | 2014-12-30 | 2017-02-22 | 东南大学 | Method and device for leveling scattering path line of distributed fiber-optic sensing system |
| CN206804152U (en) * | 2017-04-13 | 2017-12-26 | 华中师范大学 | A kind of single-photon detector of frequency-tunable |
| CN108444463A (en) * | 2017-12-21 | 2018-08-24 | 中国船舶重工集团公司第七0七研究所 | A kind of digital closed-loop optic fiber gyroscope circuit inhibiting spike asymmetry |
| CN109547098B (en) * | 2018-10-25 | 2020-07-07 | 浙江大学 | Microwave photon time delay measurement calibrating device |
| CN109459010B (en) * | 2018-12-26 | 2020-07-14 | 中国电子科技集团公司第二十六研究所 | Novel chopper circuit for optical fiber gyroscope |
| CN114777656B (en) * | 2022-06-23 | 2022-09-02 | 北京理工导航控制科技股份有限公司 | Optical fiber gyroscope screening ring system based on neural network, method and storage medium |
| CN115560741A (en) * | 2022-09-23 | 2023-01-03 | 北京航空航天大学 | Differential fiber-optic gyroscope based on polarization mode multiplexing |
| CN115839711B (en) * | 2023-02-16 | 2023-05-26 | 中国船舶集团有限公司第七〇七研究所 | Optical fiber gyroscope |
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