CN109579819A - It is a kind of to improve the method for optic fiber gyroscope graduation factor performance, optical fibre gyro - Google Patents
It is a kind of to improve the method for optic fiber gyroscope graduation factor performance, optical fibre gyro Download PDFInfo
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- CN109579819A CN109579819A CN201811533241.7A CN201811533241A CN109579819A CN 109579819 A CN109579819 A CN 109579819A CN 201811533241 A CN201811533241 A CN 201811533241A CN 109579819 A CN109579819 A CN 109579819A
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- light source
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- fibre gyro
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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
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- Optics & Photonics (AREA)
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Abstract
The invention discloses a kind of methods for improving optic fiber gyroscope graduation factor performance, optical fibre gyro.Method includes carrying out spectral signature optimization using input light source of the SLD light source as optical fibre gyro, and to the light beam in optical fibre gyro, and Gaussian spectrum is transformed into flat spectrum.The ingenious SLD light source that low cost is utilized of the present invention truly realizes the effect of low cost, high constant multiplier performance using the method that the Gaussian spectrum of spectrum symmetry difference is become to the good flat spectrum of spectrum symmetry in the optical fibre gyro based on SLD light source.And light path design is carried out to the optical fibre gyro based on SLD light source, type selecting has been carried out to the optical device for realizing spectral signature transformation, has used FBG filter, and has devised the spectral signature transformation that different light beams are realized in the position in the optical path of FBG filter.The present invention forms that device is few, fusing point quantity is few, fault point is few, so that high reliablity, at low cost；Production difficulty is small, is easy to Project Realization, has important promotional value.
Description
Technical field
The present invention relates to fiber-optics gyroscope fields, and in particular, to a kind of to improve optic fiber gyroscope graduation factor performance
Method, optical fibre gyro.
Background technique
Traditional optical fibre gyro, optical routing 5 devices composition: SLD light source, fiber coupler, integrated optical modulator,
Fiber optic loop and photodetector；The optical fibre gyro being made of the optical path, optical device is relatively fewer, have simple production process,
The features such as purchase cost is low.
But due to the inherent characteristics such as the spectrum symmetry of SLD light source is poor, spectrum width is wider, cause using SLD light source package
Optical fibre gyro be difficult to realize higher constant multiplier performance.
In order to improve the constant multiplier performance of optical fibre gyro, has in the prior art using complicated approach and realize, such as apply
It number realizes, the described method comprises the following steps for 2018103017479: " Modeling Calculation Steinhart Hart equation coefficient,
And according to Steinhart Hart establishing equation closed-loop fiber optic gyroscope SLD thermistor die temperature T and digitlization equalization point electricity
Press VIN corresponding relationship；It is quasi- between Modeling Calculation SLD thermistor die temperature variation delta T and constant multiplier variation delta K
Collaboration number；Temperature control bridge circuit equalization point voltage is extracted, digitlization equalization point voltage is obtained；According to digitlization equalization point voltage,
The corresponding temperature of Contemporary Digital equalization point voltage is obtained by T and VIN corresponding relationship, utilizes this corresponding temperature and current mark
The compensated constant multiplier in factor temperature field is spent, final gyro constant multiplier is obtained.Realize closed-loop fiber optic gyroscope scale because
Several fast and stables." however, this method is complicated for operation, it is not easy to Project Realization.
SLD light source generally is substituted with the good ASE light source of spectrum symmetry in the industry；ASE light source is multiple by pump laser, wavelength-division
It is formed with 6 part such as device, Er-doped fiber, reflective optical system, optoisolator and optical filter.
However, number of optical devices is 2 times of SLD luminous source optical fiber gyro, ASE using the optical fibre gyro of ASE light source package
The cost of raw material of light source is 3~4 times of SLD light source, and ASE light source also proposed very high requirement to production technology.
It is herein:
Optical fibre gyro: be all solid state gyroscope based on Sagnac effect for detecting turning rate being inertial navigation
Important component in system, be widely used in the weaponrys such as Aeronautics and Astronautics, navigation, land battlebus and oil well logging,
Antenna positions civil field.
SLD light source: super generating penetrates diode, and a kind of wide spectrum light source is used for middle low-precision optical fiber gyro.
ASE light source: Er-Doped superfluorescent fiber source, a kind of wide spectrum light source based on spontaneous radiation amplification are used for high-precision optical fiber top
Spiral shell
FBG filter: fiber grating filter.
Summary of the invention
Present invention solves the technical problem that be to overcome the deficiencies of existing technologies, provide a kind of raising optical fibre gyro scale because
The method of number performance, this method is at low cost, is easy to Project Realization, and it is significant to improve the constant multiplier impact of performance.
The object of the invention is achieved through the following technical solutions:
A kind of method improving optic fiber gyroscope graduation factor performance, the input using SLD light source as optical fibre gyro are provided
Light source, and spectral signature optimization is carried out to the light beam in optical fibre gyro, Gaussian spectrum is transformed into flat spectrum.
In practical application, the spectral signature of SLD light source is Gaussian spectrum, at low cost although spectral signature performance is poor.Optical fiber
The constant multiplier and optical source wavelength of gyro are in inversely prroportional relationship, in addition, the performance of constant multiplier is also by the shadow of light source spectrum property
It rings.In the present solution, using the SLD light source of low cost using this principle, flat spectrum is optimized into its spectral signature, is put down
Smooth spectrum has better spectrum symmetry relative to Gaussian spectrum, and spectrum reflects the Wavelength distribution situation of light, and spectrum is symmetrically then said
The wavelength of Mingguang City is symmetrical centered on mean wavelength.This programme has broken prior art bottleneck, so that low cost, high scale
Factor performance becomes reality.
Further, the light beam is the input light beam of optical fibre gyro.
Further, the light beam is the interfering beam in optical fibre gyro.
Further, spectral signature optimization is carried out to the light beam in optical fibre gyro using FBG filter.FBG filter energy
Gaussian spectrum, is converted into required flat spectrum by the requirement for fully meeting spectral signature conversion.
Another object of the present invention is to provide a kind of methods for applying above-mentioned raising optic fiber gyroscope graduation factor performance
Optical fibre gyro.
One of preferably, optical fibre gyro includes photodetector and sequentially connected light source, fiber coupler,
Integrated optical modulator, fiber optic loop, the photodetector are connect with fiber coupler；The light source uses SLD light source；Also wrap
FBG filter is included, the FBG filter is arranged between SLD coupling light source and optical fiber device.
In the present solution, FBG filter is arranged between SLD coupling light source and optical fiber device, for by the spectrum of SLD light source
Feature becomes flat spectrum by Gaussian spectrum, and the spectrum symmetry by improving input light source realizes the constant multiplier performance of optical fibre gyro
Raising.
Preferably two, the FBG filter is arranged before photodetector, photodetector and optical fiber coupling
Between clutch.In the present solution, by carrying out spectral characteristic optimization to the interference light before input photodetector.
Compared with the existing technology, the invention has the benefit that
The ingenious SLD light source that low cost is utilized of the present invention, uses in the optical fibre gyro based on SLD light source by spectrum pair
The Gaussian spectrum of title property difference becomes the method for the good flat spectrum of spectrum symmetry, truly realize low cost, high scale because
The effect of number performance.And light path design is carried out to the optical fibre gyro based on SLD light source, to the optics device for realizing spectral signature transformation
Part has carried out type selecting, uses FBG filter, and devises the light that different light beams are realized in the position in the optical path of FBG filter
Spectrum signature transformation, is finally reached the purpose for improving constant multiplier performance.Present invention composition device is few, fusing point quantity is few, fault point
It is few, so that high reliablity, at low cost；Production difficulty is small, is easy to Project Realization, has important promotional value.
Detailed description of the invention
Fig. 1 is the optical fibre gyro schematic illustration of high constant multiplier performance of the embodiment 1 based on SLD light source.
Fig. 2 is the optical fibre gyro schematic illustration of high constant multiplier performance of the embodiment 2 based on SLD light source.
Specific embodiment
The present invention is further illustrated With reference to embodiment.Wherein, attached drawing only for illustration,
What is indicated is only schematic diagram, rather than pictorial diagram, should not be understood as the limitation to this patent；Reality in order to better illustrate the present invention
Example is applied, the certain components of attached drawing have omission, zoom in or out, and do not represent the size of actual product；To those skilled in the art
For, the omitting of some known structures and their instructions in the attached drawings are understandable.
Embodiment 1
The present embodiment provides a kind of methods for improving optic fiber gyroscope graduation factor performance, by using SLD light source as light
The input light source of fine gyro, and spectral signature optimization is carried out to the light beam in optical fibre gyro, Gaussian spectrum is transformed into flat spectrum and is come
It realizes.Spectral signature optimization is carried out to the light beam in optical fibre gyro using FBG filter.The light beam is the input of optical fibre gyro
Light beam.
As a specific embodiment, the present embodiment also provide it is a kind of using the above method realize based on SLD
The optical fibre gyro of the high constant multiplier performance of light source, including photodetector and sequentially connected light source, fiber coupler, collection
At optical modulator, fiber optic loop, the photodetector is connect with fiber coupler；The light source uses SLD light source；Further include
FBG filter, the FBG filter are arranged between SLD coupling light source and optical fiber device.
The present embodiment is designed to improve the constant multiplier performance of optical fibre gyro by the light path part to optical fibre gyro.
It is understood that the circuit part of optical fibre gyro can be conventional arrangement, without change.
Working principle:
The output light of SLD light source optimizes by the spectral signature of FBG filter, and it is excellent that spectral signature becomes spectrum symmetry
Good flat spectrum, after which sequentially enters fiber coupler, integrated optical modulator, the effect through fiber optic loop formed it is opposite and
Capable light beam, forms interference light after integrated optical modulator, is successively entering light by fiber coupler, photodetector
The circuit part of fine gyro.
Measure of merit:
The optical fibre gyro of the present embodiment is fixed on uniaxial rate table, is acquired and is calculated using rate table combined data
Machine measures the constant multiplier of optical fibre gyro, and retest repeatedly obtains repeatability, calculates the mark of optical fibre gyro at different rates
Degree factor error obtains scale factor linearity, calculates the scale factor error of optical fibre gyro in forward and backward and is marked
Spend factor symmetry.
Through overtesting it is found that the present embodiment is compared with using two kinds of optical fibre gyros of conventional light path scheme, the present embodiment
The optical device of optical fibre gyro is SLD light source, fiber coupler, integrated optical modulator, fiber optic loop, photodetector, FBG filter
Wave device, only than the multiple FBG filters of optical fibre gyro using ASE light source, opposite 10 optical devices using ASE light source come
It says, even more composition device is few, fusing point quantity is few, fault point is few, so that high reliablity, at low cost；And it only needs in conventional SLD light
Increase FBG filter in the optical fibre gyro in source, production difficulty is small.
For the performance of constant multiplier, spectrum excellent symmetric, constant multiplier repeatability, constant multiplier are symmetrical
Property, the equal < 5ppm of scale factor linearity, for the optical fibre gyro of relatively conventional SLD light source, have a qualitative leap, reached high
The equivalent effect of expensive ASE optical fibre gyro.
Specific feature is shown in Table 1.
Table 1
The optical fibre gyro of the present embodiment design, constant multiplier performance is high, can reach the water of the optical fibre gyro using ASE light source
It is flat, and relative to the optical fibre gyro using ASE light source, the cost of the optical fibre gyro of the present embodiment substantially reduces, and has higher
Reliability.
Embodiment 2
The present embodiment provides photodetector and sequentially connected light source, fiber coupler, integrated optical modulators, light
Fine ring, the photodetector are connect with fiber coupler；The light source uses SLD light source；It further include FBG filter, it is described
FBG filter is arranged before photodetector, between photodetector and fiber coupler.
Working principle:
Successively after fiber coupler, integrated optical modulator, the effect through fiber optic loop is formed the output light of SLD light source
The light beam to go in the same direction, forms interference light after integrated optical modulator, into after fiber coupler, passes through FBG filter
Effect, become spectral characteristic be flat spectrum interference light, enter the circuit part of optical fibre gyro through photodetector after.
The present embodiment difference from example 1 is that FBG filter setting position.By before photodetector
FBG filter is added, changes the spectral characteristic of optical fibre gyro interference light, inherently changes the knot of entire optical path optical transport
Fruit improves the constant multiplier performance of the optical fibre gyro based on SLD light source.
Obviously, above-described embodiment is only intended to clearly illustrate technical solution of the present invention example, and is not
Restriction to embodiments of the present invention.For those of ordinary skill in the art, on the basis of the above description also
It can make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all
Made any modifications, equivalent replacements, and improvements etc. within the spirit and principles in the present invention should be included in right of the present invention and want
Within the protection scope asked.
Claims (6)
1. a kind of method for improving optic fiber gyroscope graduation factor performance, which is characterized in that using SLD light source as optical fibre gyro
Light source is inputted, and spectral signature optimization is carried out to the light beam in optical fibre gyro, Gaussian spectrum is transformed into flat spectrum.
2. the method according to claim 1 for improving optic fiber gyroscope graduation factor performance, which is characterized in that the light beam is
The input light beam of optical fibre gyro.
3. the method according to claim 1 for improving optic fiber gyroscope graduation factor performance, which is characterized in that the light beam is
Interfering beam in optical fibre gyro.
4. according to claim 1 to the method for improving optic fiber gyroscope graduation factor performance described in 3 any one, feature exists
In using FBG filter to the light beam progress spectral signature optimization in optical fibre gyro.
5. a kind of apply the optical fibre gyro for improving the method for optic fiber gyroscope graduation factor performance described in claim 4, including light
Electric explorer and sequentially connected light source, fiber coupler, integrated optical modulator, fiber optic loop, the photodetector with
Fiber coupler connection；It is characterized in that, the light source uses SLD light source；It further include FBG filter, the FBG filter is set
It sets between SLD coupling light source and optical fiber device.
6. a kind of apply the optical fibre gyro for improving the method for optic fiber gyroscope graduation factor performance described in claim 4, including light
Electric explorer and sequentially connected light source, fiber coupler, integrated optical modulator, fiber optic loop, the photodetector with
Fiber coupler connection；It is characterized in that, the light source uses SLD light source；It further include FBG filter, the FBG filter is set
It sets before photodetector, between photodetector and fiber coupler.
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Cited By (3)
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| CN112710297A (en) * | 2020-12-18 | 2021-04-27 | 湖南航天机电设备与特种材料研究所 | Optical fiber gyroscope and parameter determination method thereof |
| CN114234955A (en) * | 2022-03-01 | 2022-03-25 | 深圳奥斯诺导航科技有限公司 | Scale factor on-line compensation system and method of fiber-optic gyroscope |
| CN115824265A (en) * | 2023-02-27 | 2023-03-21 | 中国船舶集团有限公司第七〇七研究所 | Method for reducing temperature sensitivity of scale factor of fiber-optic gyroscope and fiber-optic gyroscope |
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|---|---|---|---|---|
| CN112710297A (en) * | 2020-12-18 | 2021-04-27 | 湖南航天机电设备与特种材料研究所 | Optical fiber gyroscope and parameter determination method thereof |
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| CN115824265A (en) * | 2023-02-27 | 2023-03-21 | 中国船舶集团有限公司第七〇七研究所 | Method for reducing temperature sensitivity of scale factor of fiber-optic gyroscope and fiber-optic gyroscope |
| CN115824265B (en) * | 2023-02-27 | 2023-04-21 | 中国船舶集团有限公司第七〇七研究所 | Method for reducing temperature sensitivity of scale factor of fiber optic gyroscope and fiber optic gyroscope |
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Application publication date: 20190405 |