CN105716830A - Method for compensating asymmetric length of optical fiber ring used by optical fiber gyro - Google Patents
Method for compensating asymmetric length of optical fiber ring used by optical fiber gyro Download PDFInfo
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- CN105716830A CN105716830A CN201510282059.9A CN201510282059A CN105716830A CN 105716830 A CN105716830 A CN 105716830A CN 201510282059 A CN201510282059 A CN 201510282059A CN 105716830 A CN105716830 A CN 105716830A
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Abstract
The invention discloses a method for compensating an asymmetric length of an optical fiber ring used by an optical fiber gyro, belonging to the optical measurement and optical fiber sensing technology field. The method comprises steps of performing measurement on the stress distribution of the optical fiber under various temperatures, obtaining the asymmetric length of the optical fiber ring through calculating the stressintegration difference, and intercepting an optical fiber with the length equivalent to the asymmetric length on the corresponding end of the optical fiber ring according to the calculation so as to improve the symmetry of the optical fiber. The invention adopts the Brillouin light time domain analysis technology to measure and calculate the asymmetric length of the optical ring fiber, the device is simple and operation is easy, the temperature excitation range is increased, and the optical ring fiber performance can be comprehensively reflected.
Description
Technical field
The present invention relates to optical measurement and technical field of optical fiber sensing, a kind of method being specifically related to asymmetric length of compensated optical fiber ring.
Background technology
Fiber optic loop is the core component of optical fibre gyro, and the quality of its quality directly affects the precision of optical fibre gyro.Optical fibre gyro is easily subject to the environmental disturbances such as temperature, vibration, magnetic field in actual applications, causes that the two-beam that in fiber optic loop, both forward and reverse directions is propagated produces nonreciprocal phase error, thus reducing the performance of optical fibre gyro.Commonly used quadrupole symmetrical winding in the coiling of fiber optic loop at present, this improves the transient response of fiber optic loop to a certain extent.But technique for coiling is complicated, in winding process, optical fiber climbs, subsides, the defect such as intersection can produce additional stress, causes stress distribution asymmetric.It addition, in order to ensure that fiber optic loop has good anti-vibration and stability, it usually needs fiber optic loop is carried out gluing, due to the contraction at different temperatures of the uneven of gluing and colloid, also result in fiber optic loop asymmetric along the stress distribution of both sides, midpoint.Fiber optic loop can weaken, about the slight unsymmetry at midpoint, the advantage even losing quadrupole symmetrical winding significantly, and existing winding technology cannot ensure that fiber optic loop has absolute symmetry, has a strong impact on the precision of optical fibre gyro.Therefore, after fiber optic loop coiling completes, suitable method to be had to detect its symmetry, and improve its symmetry by compensating.
At present the prior art in fiber optic loop Symmetry Detection in particular how compensation is all more complicated, in CN102175432A " a kind of method utilizing compensation technique to improve optical fiber ring quality " patent of invention as disclosed in JIUYUE in 2011 7 days, being proposed by measuring the nonreciprocal degree of fiber optic loop thermic and obtain the equivalent degree of asymmetry of fiber optic loop, the equivalent asymmetry measurement according to obtaining goes out the asymmetric length difference of the equivalence between fiber optic loop two-arm；Then arm short for asymmetric for the equivalence of fiber optic loop length is increased length, or another one arm is reduced length so that the asymmetric length difference of equivalence of two-arm is zero, thus improving the quality of fiber optic loop.And for example in CN103048115A disclosed in 17 days April in 2013 " a kind of method detecting gyro optical fiber ring quality and device thereof " patent of invention, propose to assemble an optical fibre gyro system incorporating fiber optic loop to be detected, rotating speed measurement to the gyro system incorporating testing fiber ring, obtain tach signal, then testing fiber circulating application is added a radial temperature excitation, obtain the sensing thermic error angle of this optical fibre gyro system, further according to the tach signal obtained and sensing thermic error angle, obtain the error in pointing temperature-sensitivity coefficient of testing fiber ring, the asymmetric length of equivalence of testing fiber ring is judged finally according to error in pointing temperature-sensitivity coefficient, judge the quality of fiber optic loop, further by compensating the length of tail optical fiber, reduce error in pointing temperature-sensitivity coefficient, and then reduce the asymmetric length of fiber optic loop, improve the quality of fiber optic loop.
Above-mentioned prior art all needs a set of fiber optic loop detecting device and a controlled heater in operation, and need the tail optical fiber of fiber optic loop one end is repeatedly performed the fusing operation of spreading or truncate, obtain the output of fiber optic loop detecting device under different compensated optical fiber length, the asymmetric length obtaining fiber optic loop is directly or indirectly calculated according to the linear relationship between this output result and compensated optical fiber length, whole operation calculating process is complex, and the Temperature Excitation of fiber optic loop is mode of heating by it, it does not have consider the performance of fiber optic loop under cryogenic conditions.
Summary of the invention
The invention aims to overcome the drawbacks described above existed in prior art, there is provided a kind of and calculate simple, easy to operate method to fiber optic loop stress distribution measurement at different temperatures, and by calculating its stress integration difference, the length of fiber optic loop is compensated.
For achieving the above object, the present invention proposes a kind of method of asymmetric length of compensated optical fiber ring, and the method comprises the following steps:
1) fiber optic loop is placed in high-low temperature chamber, to the stress distribution measurement of fiber optic loop under different temperatures；
2) tested data by stress distribution and obtain the fiber optic loop starting point A length value corresponding with terminal B, and thus calculate the midpoint M obtaining fiber optic loop；
3) the stress distribution data on the left of the M of fiber optic loop midpoint are integrated summationWherein m represents data amount check total data acquisition system from starting point A to midpoint M, εiRepresent the strain value that i-th data point is corresponding；
4) the strain integrated value on the right side of the M of fiber optic loop midpointWherein n represents data amount check total data acquisition system from midpoint M to terminal B, εiRepresent the strain value that i-th data point is corresponding；
5) the strain integration differential ε=ε of the M left and right sides, fiber optic loop midpoint is calculatedL-εR；
6) fiber optic loop midpoint M is moved different length to the left or to the right, recalculate the strain integration differential of the left and right sides；
7) with length for abscissa line, strain integration differential is the coordinate longitudinal axis, sets up a linear math curve；
8) stress distribution under different temperature points is tested Data duplication above-mentioned steps, obtain the linear math curve of corresponding different temperature points；
9) length value that the point of intersection of different linearity curves is corresponding is the asymmetric length of fiber optic loop；
In technique scheme, complete step 9) after, intercepting the optical fiber isometric with the asymmetric length calculated in one end that fiber optic loop is corresponding, thus realizing the compensation to this fiber optic loop unsymmetry, promoting the quality of fiber optic loop.
In technique scheme, described step 1) in the setting of high-low temperature chamber temperature spot range for-40 DEG C～60 DEG C.
The present invention has significant technique effect: without complicated fiber optic loop detecting device, operating process is simple, it is only necessary to fiber optic loop carries out a fusing operation, and prior art at least needs fiber optic loop one end tail optical fiber is carried out the fusing operation of three spreadings or truncate；Fiber optic loop can also be carried out the Temperature Excitation of total temperature scope by the present invention, it is possible to more fully reflect the performance of fiber optic loop.
Accompanying drawing explanation
Fig. 1 is fiber optic loop stress distribution test apparatus structure schematic diagram；
Fig. 2 is fiber optic loop stress distribution test curve；
Fig. 3 is the fiber optic loop starting point A point schematic diagram of the transition on stress test curve；
Fig. 4 is fiber optic loop terminal B transition point schematic diagram on stress test curve；
Fig. 5 is that fiber optic loop midpoint M moves to left rear distribution curve of stress schematic diagram；
Fig. 6 is the strain integration differential curve that under different temperatures, fiber optic loop midpoint M moves to left correspondence；
Fig. 7 is the strain integration differential curve that under different temperatures, fiber optic loop midpoint M moves to right correspondence；
Fig. 8 is that fiber optic loop compensates rear and front end strain integration differential contrast.
In figure: 101-computer；102-stress analysis instrument；103-polarization maintaining optical fibre wire jumper；
104-high-low temperature chamber；105-fiber optic loop；
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
The method of a kind of asymmetric length of compensated optical fiber ring that the present invention proposes, is embodied as step as follows:
1) use Polarization Maintaining Optical Fiber Fusion Splicer by the tail optical fiber at fiber optic loop 105 two ends and polarization maintaining optical fibre wire jumper 103 phase welding, then polarization maintaining optical fibre wire jumper 103 is connected with stress analysis instrument 102, then stress analysis instrument 102 is connected with computer 101；
2) fiber optic loop 105 is positioned in high-low temperature chamber 104, the running temperature of high-low temperature chamber 104 is respectively set to-40 DEG C, 20 DEG C and 60 DEG C；
3) under each temperature spot, after temperature stabilization in high-low temperature chamber 104, the stress distribution of fiber optic loop 105 measured by applied stress analyser 102, measures 8 groups of data, according to the Plotting data stress distribution test curve figure obtained；
4) typical stress distribution test curve is as in figure 2 it is shown, this curve reflects the STRESS VARIATION situation of fiber optic loop 105.The curve that fiber optic loop in figure 105 initiates two ends carries out partial enlargement, and the length value that STRESS VARIATION value transition point is corresponding is the starting point A and terminal B of fiber optic loop 105, as shown in Figure 3 and Figure 4, calculates according to starting point A and terminal B and obtains length value corresponding to midpoint M；
5) the stress distribution data on the left of fiber optic loop 105 midpoint M are integrated summationWherein m represents data amount check total data acquisition system from starting point A to midpoint M, εiRepresent the STRESS VARIATION value that i-th data point is corresponding；
6) the STRESS VARIATION integrated value on the right side of the M of fiber optic loop midpoint is calculatedWherein n represents data amount check total data acquisition system from midpoint M to terminal B, εiRepresent the STRESS VARIATION value that i-th data point is corresponding；
7) the STRESS VARIATION integration differential ε=ε of the M left and right sides, fiber optic loop 105 midpoint is calculatedL-εR；
8) test data according to the stress distribution at above-mentioned steps 5 to step 6 respectively p-40 DEG C, 20 DEG C and 60 DEG C to process, and the STRESS VARIATION integration differential under same temperature point is averaged；
9) the midpoint M of fiber optic loop 105 is moved to the left 1m, 5m and 10m (specify herein the length that is moved to the left on the occasion of, it is to the right negative value), be equivalent to terminal B and move forward the length of correspondence, as shown in Figure 5, these part data that terminal B movable length is corresponding in calculating process can be given up to fall, and is effectively equivalent to intercept one section of optical fiber at fiber optic loop terminal B end.Then according to step 5 to step 8 calculates midpoint M moves the strain integration differential corresponding to different length；
10) with the length of movement for abscissa line, strain integration differential is the coordinate longitudinal axis, sets up linear math curve, as shown in Figure 6；
11) in Fig. 6, the length value corresponding to intersection point of the linearity curve under 3 different temperatures is averaged the asymmetric length being fiber optic loop 105, the computed optical fiber isometric with asymmetric length out is intercepted, thus eliminating the unsymmetry of this fiber optic loop 105 in one end of fiber optic loop 105 correspondence.
Fig. 7 be fiber optic loop 105 midpoint M move right 1m, 5m and 10m time, STRESS VARIATION integration differential curve corresponding under different temperatures, length value corresponding to linearity curve extending line intersection point place is averaged the asymmetric length being fiber optic loop 105, and result of calculation when being moved to the left with fiber optic loop midpoint M is consistent.
Fig. 8 is the comparison diagram that under different temperatures, fiber optic loop 105 compensates rear and front end strain integration differential, it can be seen that fiber optic loop 105 is after overcompensation, under different temperatures, the strain integration differential at two ends is basically identical, the symmetry of fiber optic loop 105 be improved significantly, thus demonstrating the feasibility of the method.
The content not being described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (4)
1. the method for the compensated optical fiber asymmetric length of gyro fiber optic loop, it is characterised in that comprise the following steps:
(1) fiber optic loop is placed in high-low temperature chamber, to the stress distribution measurement of fiber optic loop under different temperatures；
(2) obtained the fiber optic loop starting point A length value corresponding with terminal B by stress distribution measurement data, and thus calculate the midpoint M obtaining fiber optic loop；
(3) the stress distribution data on the left of the M of fiber optic loop midpoint are integrated summationWherein m represents data amount check total data acquisition system from starting point A to midpoint M, εiRepresent the strain integration that i-th data point is corresponding；
(4) the stress distribution data on the right side of the M of fiber optic loop midpoint are integrated summationWherein n represents data amount check total data acquisition system from midpoint M to terminal B, εiRepresent the strain integration that i-th data point is corresponding；
(5) the strain integration differential ε=ε of the M left and right sides, fiber optic loop midpoint is calculatedL-εR；
(6) fiber optic loop midpoint M is moved different length to the left or to the right, recalculate the strain integration differential of the left and right sides；
(7) with movable length for abscissa line, strain integration differential is the coordinate longitudinal axis, sets up a linear math curve；
(8) stress distribution under different temperature points is tested Data duplication above-mentioned steps, obtain the linear math curve of corresponding different temperature points；
(9) the asymmetric length of fiber optic loop it is by the length value that the point of intersection of different linearity curves is corresponding.
2. the method for the compensated optical fiber asymmetric length of gyro fiber optic loop according to claim 1, it is characterised in that: also include step (10), intercept the optical fiber isometric with the asymmetric length calculated in one end that fiber optic loop is corresponding.
3. the method for the compensated optical fiber asymmetric length of gyro fiber optic loop according to claim 1 and 2, it is characterised in that: in described step (1), the temperature of high-low temperature chamber arranges and ranges for-40 DEG C～60 DEG C.
4. the method for the compensated optical fiber asymmetric length of gyro fiber optic loop according to claim 1 and 2, it is characterised in that: when described linearity curve is more than 2, the meansigma methods of the length value that its point of intersection is corresponding is the asymmetric length of fiber optic loop.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108088433A (en) * | 2017-12-15 | 2018-05-29 | 中国船舶重工集团公司第七0七研究所 | A kind of optical fibre gyro ring tail optical fiber stress turn compensation method |
| CN110672132A (en) * | 2019-12-05 | 2020-01-10 | 湖南航天机电设备与特种材料研究所 | Method and device for testing and positioning optical fiber ring thermal center |
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| US20020021434A1 (en) * | 2000-08-09 | 2002-02-21 | Kabushiki Kasiha | Evaluation mask, focus measuring method and aberration measuring method |
| CN101339093A (en) * | 2008-08-29 | 2009-01-07 | 北京高光科技有限公司 | Optical fiber ring quality measurement method and its device for optical fibre gyroscope |
| CN102175432A (en) * | 2011-02-18 | 2011-09-07 | 苏州光环科技有限公司 | Method for improving quality of optical fiber loop by utilizing compensation technique |
| CN103048115A (en) * | 2012-12-08 | 2013-04-17 | 苏州光环科技有限公司 | Method for detecting quality of optical fiber ring for gyroscope and device thereof |
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2015
- 2015-05-28 CN CN201510282059.9A patent/CN105716830A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4495411A (en) * | 1982-10-27 | 1985-01-22 | The United States Of America As Represented By The Secretary Of The Navy | Fiber optic sensors operating at DC |
| US20020021434A1 (en) * | 2000-08-09 | 2002-02-21 | Kabushiki Kasiha | Evaluation mask, focus measuring method and aberration measuring method |
| CN101339093A (en) * | 2008-08-29 | 2009-01-07 | 北京高光科技有限公司 | Optical fiber ring quality measurement method and its device for optical fibre gyroscope |
| CN102175432A (en) * | 2011-02-18 | 2011-09-07 | 苏州光环科技有限公司 | Method for improving quality of optical fiber loop by utilizing compensation technique |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108088433A (en) * | 2017-12-15 | 2018-05-29 | 中国船舶重工集团公司第七0七研究所 | A kind of optical fibre gyro ring tail optical fiber stress turn compensation method |
| CN108088433B (en) * | 2017-12-15 | 2021-05-07 | 中国船舶重工集团公司第七0七研究所 | Stress turn number compensation method for fiber optic gyroscope loop tail fiber |
| CN110672132A (en) * | 2019-12-05 | 2020-01-10 | 湖南航天机电设备与特种材料研究所 | Method and device for testing and positioning optical fiber ring thermal center |
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Application publication date: 20160629 |