CN109931922A - A kind of optical fibre gyro starting quick self-checking survey method - Google Patents
A kind of optical fibre gyro starting quick self-checking survey method Download PDFInfo
- Publication number
- CN109931922A CN109931922A CN201711345826.1A CN201711345826A CN109931922A CN 109931922 A CN109931922 A CN 109931922A CN 201711345826 A CN201711345826 A CN 201711345826A CN 109931922 A CN109931922 A CN 109931922A
- Authority
- CN
- China
- Prior art keywords
- optical fibre
- fibre gyro
- phase difference
- gain
- loop
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
Test is fitted obtained loop gain value and is compared with preset threshold value, it may be determined that optical fibre gyro loop circuit state by a kind of optical fibre gyro starting quick self-checking survey method it is characterized in that corresponding demodulation value progress linear fit is obtained loop gain value.Self-test when solving the problems, such as optical fibre gyro starting with software approach, takes full advantage of the modulation /demodulation feature of optical fibre gyro itself.Method is realized simply, does not increase the complexity of optical fibre gyro software, does not influence the normal work of optical fibre gyro after starting.Detection speed is fast, and required time is few, and the time for providing required detection information and result is generally less than 1ms.Testing result is realized flexibly, can be provided testing result in optical fibre gyro software inhouse, can also be handled by host computer, obtain result.Detection information is more comprehensive, and testing result is relatively reliable.The information provided includes the whole loop of optical fibre gyro, and any link breaks down and can all embody in testing result in loop.
Description
Technical field
The present invention relates to equipment self-inspections to survey field, and especially a kind of optical fibre gyro starting quick self-checking surveys method.
Background technique
Optical fibre gyro is a kind of angular-rate sensor based on Sagnac effect.Rotation will lead to phase anti-spread in sensing ring
Two-beam generate phase difference, the phase difference is directly proportional to revolving speed.Two-beam can be interfered in output end, by detecting light intensity
Variation can demodulate corresponding revolving speed.Since optical fibre gyro itself has good reciprocity structure, with device and work
Horizontal increasingly mature of skill, optical fibre gyro has been achieved with very superior performance at present.Since optical fibre gyro is with no dynamic state part
Part, high reliability, measurement range are big, anti shock and vibration, small in size, light weight and cost is low, are suitble to the advantages that producing in enormous quantities,
The mainstream inertia device of angular speed sensing is become.Optical fibre gyro has had been widely used inertial navigation system now, has defended
The fields such as star gesture stability, seismology and structure measurement.
In the application of optical fibre gyro, the open state self-test of optical fibre gyro is a highly important technology.Optical fiber top
The self-test state of spiral shell is the whether normal important criterion of optical fibre gyro state and the important original state parameter of system, in force
Application demand in device system and satellite is especially pronounced.In the original state of optical fibre gyro, the light function of photodetector is reached
Rate is wherein mostly important one.In the transport and storage process of optical fibre gyro, lead to device damage since protection is improper
The optical power for often resulting in arrival photodetector with factors such as long-time device performance degenerations is greatly lowered even zero.Detection
Optical power is greatly lowered the performance that can seriously affect optical fibre gyro, even more serious the result is that destroying the normal of optical fibre gyro
Operating condition makes optical fibre gyro output data mistake occur, can not reflect true revolving speed input.The optical fiber of above-mentioned failure occurs
If gyro accesses navigation system or stabilized platform, consequence that can not be estimated can be brought to system.Therefore, in system starts
Before, preferably optical fibre gyro itself start when, optical fibre gyro can accurate judgement itself working condition whether normally for system
Work is of great significance to.
Existing optical fibre gyro self-test scheme is based on hardware circuit to realize more.On the basis of optical fibre gyro detection circuit
Increase light power detection circuit, the optical power size that optical power determines arrival detector into digital circuit is acquired by hardware
To judge whether optical path states are correct.
Concrete implementation scheme includes: (1) by voltage comparator, by the average intensity of the signal of detector output and in advance
If reference voltage compare, judged by comparator output detection of optical power be more than or less than preset threshold.The method
It can be directly connected to the I0 mouth of digital circuit, judge whether optical power meets requirement by simple low and high level.(2) increase
Add detector output filter circuit and AD Acquisition Circuit.The voltage of detector output is obtained by filter circuit, represents arrival
The input optical power of detector.Output average voltage is converted into digital quantity and is input in digit chip by AD Acquisition Circuit.Number
Logic chip can quantify optical power according to AD sampled value, more accurately determine detector input optical power and optical path work
Make state.
In both the above method, method (2) is capable of providing accurate op-tical power information compared to method (1), and
Method (1) can only be more than or less than the judging result of setting threshold value to light power.But two methods are all based on hardware realization
Optical power detection, need to increase component number and type in original circuit design, increase layout area.This is for electricity
The size Control of road plate itself is very unfavorable.
In addition, there are integrity problems for the circuit part itself of increased detection optical power, when increased electronic component
When work is abnormal, detection information can influence the normal use of optical fiber there is a situation where misrepresenting deliberately, reporting by mistake.Even more important asks
Topic be reach detector optical power be loop gain a part, the failure of detection circuit also results in optical fibre gyro
Operation irregularity only detects the normal work that detection of optical power does not ensure that optical fibre gyro entirety loop.
Summary of the invention
The purpose of the invention is to overcome the above-mentioned shortcoming of the prior art, and one kind is provided and does not increase hardware electricity
Road takes full advantage of the modulation /demodulation feature of optical fibre gyro itself, and detection speed is fast, and required time is few, and testing result realizes spirit
Living, detection information is more comprehensive, and the relatively reliable optical fibre gyro starting quick self-checking of testing result surveys method.
For achieving the above object, the technical scheme is that a kind of optical fibre gyro starting quick self-checking surveys method,
Operational process includes: optical fibre gyro booting, and the light that light source issues is made of by coupler arrival Y waveguide and fiber optic loop
There is the two-beam propagated clockwise and anticlockwise in interferometer in Sagnac interferometer, the phase difference of two-beam is by two parts group
At a part is Sagnac effect phase difference caused by rotatings, another part is the modulation electricity by being applied on Y waveguide
The phase difference for the two-beam for pressing signal to generate；
For optical fibre gyro, the phase difference being applied between the two-beam that the modulation voltage on Y waveguide generates is a square waveform
Formula, the amplitude of phase difference square wave are modulation depth Δm, the period is 2 τ, whereinτIt is that light passes in fiber optic loop for the transition time
The time required to broadcasting one week, therefore for optical fibre gyro, interfere Output optical power expression formula as follows:
Wherein P0Output optical power when for no phase difference, phase modulation difference is every time τ in ΔmWith-ΔmBetween alternately
Variation；
To demodulate the Sagnac phase difference for representing revolving speeds, the Output optical power of interval τ time is carried out to ask poor, is demodulated
As a result Δ is corresponded tosSinusoidal response, be shown below:
Optical power is converted into electric signal by detector, then enters FPGA by pre-amplification circuit and converter, finally exists
Digital demodulation is carried out in FPGA, digital demodulation result becomes on the basis of above formula:
Wherein, Kdet, Kpre, KAD, KDRespectively indicate detector conversion coefficient, pre-amp gain, AD conversion coefficient and demodulation number
Word gain,Indicate modulated signal bring change in gain；In above formulaActually represent optical fiber
The forward gain size of gyro loop；
The staircase waveform for applying a fixed step amount on Y waveguide, which is equivalent to, is applied with a fixed phase difference to two-beam,
Phase difference depends on the step height of staircase waveform；Ground when the phase difference of the corresponding two-beam of the step of application is much larger than static state
Δ caused by ball revolving speedsWhen, ΔsInfluence can approximation ignore；The step Δ D of the fixed step wave of application1Corresponding phase
Difference is ΔF1=KFΔD1, wherein KFIndicate the feedback loop gain of optical fibre gyro loop；Ignore ΔsInfluence when, it is fixed
The step Δ D of staircase waveform1Corresponding demodulation value may be expressed as:
Work as ΔF1When getting the small value, sin function carries out linear approximation, in above formulaIt illustrates
The product of forward path gain and feedback channel gain, as whole loop gain, digital quantityWithThe ratio between for loop increase
Benefit value by the processing chip inside gyro or is sent to host computer progress linear fit, judges whether to meet threshold value, from
And judge the overall operation situation of optical fibre gyro.
Digital quantityWithThe ratio between reflect optical fibre gyro and modulated from digital quantity and generate, responded to Y waveguide, to dry
Optical power is related to, forward simulation circuit output is arrived, is acquired to AD, finally arrives all processes of digital demodulation result, any of them one
The failure of a link or the influence for interrupting to optical fibre gyro loop be all it is of equal value, this loop gain test method is compared to light function
Rate detection can obtain more comprehensive system information, provide more accurate system mode judgement.
To realize loop gain more accurate test and judgement, further embodiment of the present invention is: including sending out to Y waveguide
The multiple staircase waveforms for sending step height different carry out the step of gain test.
More accurate loop gain value is can be obtained into corresponding demodulation value progress linear fit, the ring that test fitting is obtained
Road yield value is compared with preset threshold value, whether normal can determine whether optical fiber loop gain, and determines optical fibre gyro loop shape
Whether state is normal.
The present invention is due to using above procedure, and advantage is compared with prior art:
(1) self-test when solving the problems, such as optical fibre gyro starting with software approach, does not increase hardware circuit, takes full advantage of optical fiber
The modulation /demodulation feature of gyro itself.
(2) method is realized simple, does not increase the complexity of optical fibre gyro software, does not influence the normal of optical fibre gyro after starting
Work.
(3) detection speed is fast, and required time is few, and the time for providing required detection information and result is generally less than 1ms.
(4) testing result is realized flexibly, can be provided testing result in optical fibre gyro software inhouse, can also be will test in information
Host computer is reached, is handled by host computer, result is obtained.
(5) detection information is more comprehensive, and testing result is relatively reliable.The information provided includes the integral loop of optical fibre gyro
Road, any link breaks down and can all embody in testing result in loop.
Detailed description of the invention
Fig. 1 is closed-loop fiber optic gyroscope structural schematic diagram of the present invention；
Fig. 2 is optical fibre gyro loop gain principles of modulation and demodulation figure of the invention；
Fig. 3 is optical fibre gyro starting up self-test work flow diagram.
Specific embodiment
The present invention is described in further details below with reference to Figure of description:
As shown in figure 3, the accuracy in order to guarantee loop gain test, the step height of staircase waveform are selected as 5 kinds, can guarantee simultaneously
After optical fibre gyro booting, it is high successively to send step to Y waveguide for the high speed of detection, the normal work after not influencing booting detection
Degree is,,,,Staircase waveform, while to Y waveguide send modulated square wave, for make staircase waveform to optical fibre gyro after
The influence of continuous work reaches minimum, and transmitted step height should be sequentially reduced, and the step of a staircase waveform that can be applicable in is high
Degree combination are as follows: 10bits, 8bits, 6bits, 4bits, 2bits, but need to be adjusted according to the optical fibre gyro of different model.
The above step height combination can be substantially met, and the phase difference that step height generates is greater than the phase difference that static revolving speed generates and (ignores
The influence of static revolving speed) and step height modulation be located at receptance function linear region.To guarantee to detect the rapidity of work,
The each step height corresponding time is chosen as 10 τ to 20 τ, and the region of step height switching is avoided in demodulation.It is whole in this way
The starting self-test work of body generally can be completed within 1ms.To the linear fit processing of 5 demodulation values can inside gyro it is complete
It is completed at also can be transmitted to host computer, by can determine whether this gyro failure compared with threshold value or continue to work normally.
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,
All technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
For those of ordinary skill, several improvements and modifications without departing from the principles of the present invention should be regarded as protection of the invention
Range.
Claims (6)
1. a kind of optical fibre gyro starting quick self-checking surveys method, it is characterized in that operational process includes: optical fibre gyro booting, light source hair
Light out reaches the Sagnac interferometer that is made of Y waveguide and fiber optic loop by coupler, and there are clockwise and inverse in interferometer
The two-beam that hour hands are propagated, the phase difference of two-beam consist of two parts, and a part is Sagnac effect phase caused by rotating
Poor Δs, another part is the phase difference of the two-beam generated by the modulated voltage signal being applied on Y waveguide；
For optical fibre gyro, the phase difference being applied between the two-beam that the modulation voltage on Y waveguide generates is a square waveform
Formula, the amplitude of phase difference square wave are modulation depth Δm, the period is 2 τ, whereinτIt is that light passes in fiber optic loop for the transition time
The time required to broadcasting one week, therefore for optical fibre gyro, interfere Output optical power expression formula as follows:
Wherein P0Output optical power when for no phase difference, phase modulation difference is every time τ in ΔmWith-ΔmBetween alternately
Variation；
To demodulate the Sagnac phase difference for representing revolving speeds, the Output optical power of interval τ time is carried out to ask poor, demodulation knot
Fruit corresponds to ΔsSinusoidal response, be shown below:
Optical power is converted into electric signal by detector, then enters FPGA by pre-amplification circuit and converter, finally exists
Digital demodulation is carried out in FPGA, digital demodulation result becomes on the basis of above formula:
Wherein, Kdet, Kpre, KAD, KDRespectively indicate detector conversion coefficient, pre-amp gain, AD conversion coefficient and demodulation number
Word gain,Indicate modulated signal bring change in gain；In above formulaActually represent light
The forward gain size of fine gyro loop；
The staircase waveform for applying a fixed step amount on Y waveguide, which is equivalent to, is applied with a fixed phase difference to two-beam,
Phase difference depends on the step height of staircase waveform；Ground when the phase difference of the corresponding two-beam of the step of application is much larger than static state
Δ caused by ball revolving speedsWhen, ΔsInfluence can approximation ignore；The step Δ D of the fixed step wave of application1Corresponding phase
Difference is ΔF1=KFΔD1, wherein KFIndicate the feedback loop gain of optical fibre gyro loop；Ignore ΔsInfluence when, it is fixed
The step Δ D of staircase waveform1Corresponding demodulation value may be expressed as:
Work as ΔF1When getting the small value, sin function carries out linear approximation, in above formulaIt illustrates
The product of forward path gain and feedback channel gain, as whole loop gain, digital quantityWithThe ratio between be loop
Yield value by the processing chip inside gyro or is sent to host computer progress linear fit, judges whether to meet threshold value,
To judge the overall operation situation of optical fibre gyro.
2. a kind of optical fibre gyro starting quick self-checking as described in claim 1 surveys method, it is characterized in that including sending to Y waveguide
The step of different multiple staircase waveforms of step height carry out gain test.
3. a kind of optical fibre gyro starting quick self-checking as claimed in claim 2 surveys method, it is characterized in that including sending to Y waveguide
Multiple staircase waveforms that step height is sequentially reduced carry out the step of gain test.
4. a kind of optical fibre gyro starting quick self-checking surveys method as claimed in claim 2 or claim 3, it is characterized in that including to Y waveguide
Send the step of step height is the staircase waveform progress gain test for being followed successively by 10bits, 8bits, 6bits, 4bits, 2bits.
5. a kind of optical fibre gyro starting quick self-checking as described in claims 1 or 2 or 3 surveys method, it is characterized in that each step
The highly corresponding time is chosen as 10 τ to 20 τ, and the region of step height switching is avoided in demodulation.
6. a kind of optical fibre gyro starting quick self-checking as claimed in claim 4 surveys method, it is characterized in that each step height pair
The time answered is chosen as 10 τ to 20 τ, and the region of step height switching is avoided in demodulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711345826.1A CN109931922B (en) | 2017-12-15 | 2017-12-15 | Rapid self-detection method for starting of fiber-optic gyroscope |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711345826.1A CN109931922B (en) | 2017-12-15 | 2017-12-15 | Rapid self-detection method for starting of fiber-optic gyroscope |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109931922A true CN109931922A (en) | 2019-06-25 |
| CN109931922B CN109931922B (en) | 2021-08-10 |
Family
ID=66979450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711345826.1A Active CN109931922B (en) | 2017-12-15 | 2017-12-15 | Rapid self-detection method for starting of fiber-optic gyroscope |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109931922B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110487299A (en) * | 2019-08-28 | 2019-11-22 | 江西寻准智能科技有限责任公司 | A kind of Data acquisition system of FOG system of belt current monitoring alarm function |
| CN111780742A (en) * | 2020-09-07 | 2020-10-16 | 武汉长盈通光电技术有限公司 | Optical fiber gyroscope with online fault self-checking function |
| CN112532305A (en) * | 2020-11-30 | 2021-03-19 | 成都泰格微电子研究所有限责任公司 | Self-checking system and method for satellite ground station |
| CN112595340A (en) * | 2020-09-04 | 2021-04-02 | 北京理工导航控制科技股份有限公司 | Online fault detection method for optical fiber gyroscope |
| CN113252021A (en) * | 2021-07-05 | 2021-08-13 | 西安中科华芯测控有限公司 | High-coverage-rate pre-flight self-inspection method and system for fiber-optic gyroscope |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0551537A1 (en) * | 1992-01-13 | 1993-07-21 | LITEF GmbH | Method and device to measure rotation rate using a fibre optic sagnac interferometer |
| CN101270991A (en) * | 2008-04-25 | 2008-09-24 | 北京航空航天大学 | System for measuring interfere type optic fiber gyroscope eigenfrequency and half-wave voltage adopting square wave modulation |
| CN204421915U (en) * | 2015-02-26 | 2015-06-24 | 北京芯动联科微电子技术有限公司 | The self-checking system of unable feedback electrode gyro sensor |
| CN104964681A (en) * | 2015-07-16 | 2015-10-07 | 陕西华燕航空仪表有限公司 | Self-detecting circuit and self-detecting method for open-loop optical fiber gyroscope |
| CN105758423A (en) * | 2014-12-19 | 2016-07-13 | 上海亨通光电科技有限公司 | Optical power power-on self-test method for fiber-optic gyroscope |
-
2017
- 2017-12-15 CN CN201711345826.1A patent/CN109931922B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0551537A1 (en) * | 1992-01-13 | 1993-07-21 | LITEF GmbH | Method and device to measure rotation rate using a fibre optic sagnac interferometer |
| CN101270991A (en) * | 2008-04-25 | 2008-09-24 | 北京航空航天大学 | System for measuring interfere type optic fiber gyroscope eigenfrequency and half-wave voltage adopting square wave modulation |
| CN105758423A (en) * | 2014-12-19 | 2016-07-13 | 上海亨通光电科技有限公司 | Optical power power-on self-test method for fiber-optic gyroscope |
| CN204421915U (en) * | 2015-02-26 | 2015-06-24 | 北京芯动联科微电子技术有限公司 | The self-checking system of unable feedback electrode gyro sensor |
| CN104964681A (en) * | 2015-07-16 | 2015-10-07 | 陕西华燕航空仪表有限公司 | Self-detecting circuit and self-detecting method for open-loop optical fiber gyroscope |
Non-Patent Citations (1)
| Title |
|---|
| 刘瑞鑫等: "干涉式光纤速率陀螺仪的自检测技术", 《光学仪器》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110487299A (en) * | 2019-08-28 | 2019-11-22 | 江西寻准智能科技有限责任公司 | A kind of Data acquisition system of FOG system of belt current monitoring alarm function |
| CN112595340A (en) * | 2020-09-04 | 2021-04-02 | 北京理工导航控制科技股份有限公司 | Online fault detection method for optical fiber gyroscope |
| CN111780742A (en) * | 2020-09-07 | 2020-10-16 | 武汉长盈通光电技术有限公司 | Optical fiber gyroscope with online fault self-checking function |
| CN112532305A (en) * | 2020-11-30 | 2021-03-19 | 成都泰格微电子研究所有限责任公司 | Self-checking system and method for satellite ground station |
| CN112532305B (en) * | 2020-11-30 | 2022-06-24 | 成都泰格微电子研究所有限责任公司 | Self-checking system and method for satellite ground station |
| CN113252021A (en) * | 2021-07-05 | 2021-08-13 | 西安中科华芯测控有限公司 | High-coverage-rate pre-flight self-inspection method and system for fiber-optic gyroscope |
| CN113252021B (en) * | 2021-07-05 | 2021-11-02 | 西安中科华芯测控有限公司 | High-coverage-rate pre-flight self-inspection method and system for fiber-optic gyroscope |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109931922B (en) | 2021-08-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109931922A (en) | A kind of optical fibre gyro starting quick self-checking survey method | |
| CN103115628B (en) | A kind of resonant mode optical gyroscope scale factor method of testing | |
| CN109974683A (en) | Shock resistance interferometric fiber optic gyroscope and its detection method based on twin nuclei | |
| CN103389084A (en) | Double-coupling optical fiber ring resonator coherent effect-based resonant fiber optic gyroscope | |
| CN105758421A (en) | Fiber-optic gyroscope eigenfrequency measuring equipment and application thereof | |
| CN113252021B (en) | High-coverage-rate pre-flight self-inspection method and system for fiber-optic gyroscope | |
| CN103884358B (en) | A kind of digital closed-loop optic fiber gyroscope full loop detection and emulation test system | |
| CN103968821B (en) | Two-way resonance type optical gyroscope | |
| Li et al. | Sagnac vibration sensing system with nested pulse method | |
| TWI665882B (en) | Method and device for detecting shared risk link group | |
| CN103791917A (en) | Device and method for testing vibration-temperature crosslinking coupling degree of fiber optic gyroscope | |
| CN110595599A (en) | Method for reducing polarization fading of optical fiber vibration system and detection system applying same | |
| CN104949669A (en) | Method for expanding range of fiber optic gyroscope based on magnetoresistive sensor | |
| CN109781145B (en) | Screening test system and method for MEMS gyroscope with laser seeker | |
| CN104457792B (en) | A method of measuring optic fiber gyroscope graduation factor under without mechanical rotation condition | |
| CN101706278B (en) | Modulation/demodulation method capable of monitoring optical power level | |
| CN104457791B (en) | Method for measuring fiber-optic gyroscope bandwidth under static condition | |
| CN104215319B (en) | Dynamic range adjustable differential interferometer and measuring method | |
| CN105674976A (en) | Fiber optic gyro modulation-demodulation method, as well as method and device for improving scale factor stability | |
| CN104792460A (en) | Horizontal test method for revolve-body polar moment of inertia | |
| CN106643570B (en) | Measuring device and measuring method for roll angle of projectile body | |
| CN102944232B (en) | A kind of online alignment device of optical fibre gyro modulation voltage and online alignment methods | |
| CN208187333U (en) | A kind of capacitive displacement sensing device transmitted at a distance based on transformer secondary output | |
| CN106885564B (en) | Inertial measurement method of gyroscope | |
| CN105068005B (en) | The detecting system and detection method of PG motors |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |