CN105758421A - Fiber-optic gyroscope eigenfrequency measuring equipment and application thereof - Google Patents
Fiber-optic gyroscope eigenfrequency measuring equipment and application thereof Download PDFInfo
- Publication number
- CN105758421A CN105758421A CN201410812214.9A CN201410812214A CN105758421A CN 105758421 A CN105758421 A CN 105758421A CN 201410812214 A CN201410812214 A CN 201410812214A CN 105758421 A CN105758421 A CN 105758421A
- Authority
- CN
- China
- Prior art keywords
- eigenfrequency
- square
- digital
- wave
- optical fibre
- 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.)
- Pending
Links
Landscapes
- Gyroscopes (AREA)
Abstract
The invention relates to fiber-optic gyroscope eigenfrequency measuring equipment and application thereof.The equipment comprises a digital-to-analog converter, an operational amplifier circuit, a digital square signal generation module and an oscilloscope.The operational amplifier circuit is connected with an input end of a fiber-optic gyroscope, an output end of the fiber-optic gyroscope is connected with the oscilloscope, and the digital square signal generation module is connected with the digital-to-analog converter.Compared with the prior art, the fiber-optic gyroscope eigenfrequency measuring equipment and application thereof have the advantages that by adoption of the oscilloscope, whether an output waveform of the fiber-optic gyroscope is a comb-like waveform or not is judged to determine whether a frequency of a modulation square wave is an eigenfrequency or not, and high measurement precision is achieved.
Description
Technical field
The present invention relates to a kind of fiber optic gyroscope performance debugging technique, especially relate to a kind of optical fiber gyroscope eigenfrequency measurement device and application thereof.
Background technology
Fibre optic gyroscope is based on a kind of angular rate sensor of Sagnac effect, is the main sensors being currently used for determining movable body space motion attitude.Sagnac effect refers to that two-beam is propagated in opposite directions in the fiber optic loop of Guan Bi, when fiber optic loop rotates, produces a Sagnac phase shift being directly proportional to turning rate between two-beam ripple.The time that light is propagated in fiber optic loop is eigenperiod τ, and eigenfrequency is:
When the modulating frequency of optical fibre gyro is equal to the eigenfrequency of optical fibre gyro, the best performance of gyro.But lack of the high-precision instrument that optical fiber gyroscope eigenfrequency is measured at present.
Such as Chinese patent CN102840869A discloses the measuring method of a kind of optical fiber gyroscope eigenfrequency, the method measures system based on the optical fiber gyroscope eigenfrequency of even frequency multiplication eigenfrequency square wave phase ovennodulation, the light path that measurement system adopts is completely the same with the light path of actual gyro, and typical light paths includes light source, bonder, Y waveguide, fiber optic loop, photodetector.But this measuring method is directly perceived not when measuring, and measures process complicated, and precision is inadequate.
Known, when there is deviation with the eigenfrequency of optical fibre gyro self in the frequency of modulated square wave, the output waveform of optical fibre gyro is comb wave, along with modulating frequency is close to the eigenfrequency of gyro, dressing ripple spike can be more and more less, until when modulating frequency is very accurate, detector output will not have the spike of comb wave on oscillograph.
Summary of the invention
Defect that the purpose of the present invention is contemplated to overcome above-mentioned prior art to exist and providing a kind of is measured precisely, is operated optical fiber gyroscope eigenfrequency measurement device and application thereof intuitively.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of optical fiber gyroscope eigenfrequency measurement device, including interconnective digital analog converter and discharge circuit, also include digital square-wave generating assembly and oscillograph, described discharge circuit is connected with the input of optical fibre gyro, the outfan of described optical fibre gyro is connected with oscillograph, and described digital square-wave generating assembly is connected with digital analog converter.
Described digital square-wave generating assembly includes the host computer, output interface and the FPGA that connect, and described FPGA is connected with digital analog converter.
Described measurement device also includes circuit board, and described output interface, FPGA, digital analog converter, discharge circuit are all integrated on circuit boards.
Described output interface is connected with host computer by RS422 communication cable or RS232 communication cable.
Described FPGA internal work clock operating frequencies is be more than or equal to 100MHz.
Described FPGA internal work clock operating frequencies is 400MHz.
A kind of application process of optical fiber gyroscope eigenfrequency measurement device, the method comprising the steps of:
A. the eigenfrequency coarse value of optical fibre gyro is obtained；
B. the square-wave signal of modulation is generated according to eigenfrequency coarse value；
C. digital square-wave generating assembly judges whether the output waveform of optical fibre gyro is comb wave, if it has, then perform step D, terminates if it has not, then measure, and the frequency of current square-wave signal is the eigenfrequency of optical fibre gyro；
D. digital square-wave generating assembly changes the size of square-wave signal frequency, and performs step C.
The eigenfrequency coarse value of described optical fibre gyro particularly as follows:
fp=1/2 τ
Wherein: fpFor the eigenfrequency coarse value of optical fibre gyro, τ is:
τ=nl/c
Wherein: n is optical fibre refractivity, l is that fiber optic loop is long, and c is the light velocity.
Described step B specifically includes step:
B1. digital square-wave generating assembly produces the digital square-wave of modulation according to eigenfrequency coarse value；
B2. digital square-wave is converted to analog square wave signal by digital analog converter；
B3. analog square wave signal is adjusted to the voltage amplitude of applicable optical fibre gyro modulation by discharge circuit.
Square-wave signal frequency change procedure in described step D particularly as follows: change the count resets value of FPGA Counter by host computer, it is achieved FPGA produces the change of Digital Square-Wave model frequency.
Compared with prior art, the invention have the advantages that
1) present invention adopts oscillograph, and by judging whether optical fibre gyro output waveform is that comb wave comes whether the frequency of comparison modulated square wave is eigenfrequency, certainty of measurement is high.
2) output interface, FPGA, digital analog converter, discharge circuit are all integrated on circuit boards, it is possible to improving the integrated level of equipment, transport easy to carry, layout is orderly.
3) FPGA internal work clock operating frequencies be 100MHz and more than, owing to measuring eigenfrequency and time correlation, adopt enumerator to be calculated the time, adopt 100MHz and above high-frequency work clock, record eigenfrequency precision significantly high.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention；
Fig. 2 is optical fibre gyro modulation principle figure；
Wherein: 1, FPGA, 2, digital analog converter, 3, discharge circuit, 4, output interface, 5, host computer, 6, oscillograph, 7, optical fibre gyro, 8, circuit board.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.The present embodiment is carried out premised on technical solution of the present invention, gives detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
A kind of optical fiber gyroscope eigenfrequency measurement device, as shown in Figure 1, including interconnective digital analog converter 2 and discharge circuit 3, also include digital square-wave generating assembly and oscillograph 6, discharge circuit 3 is connected with the input of optical fibre gyro 7, the outfan of optical fibre gyro 7 is connected with oscillograph 6, and digital square-wave generating assembly is connected with digital analog converter 2.
Host computer 5, output interface 4 and FPGA1, FPGA1 that digital square-wave generating assembly includes connecting are connected with digital analog converter 2.
Measurement device also includes circuit board 8, and output interface 4, FPGA1, digital analog converter 2, discharge circuit 3 are all integrated on circuit board 8.
Output interface 4 is connected with host computer 5 by RS422 communication cable or RS232 communication cable.
FPGA1 internal work clock operating frequencies is be more than or equal to 100MHz.
FPGA1 internal work clock operating frequencies is 400MHz.
The application process of above-mentioned optical fiber gyroscope eigenfrequency measurement device, including step:
A. the eigenfrequency coarse value of optical fibre gyro is obtained；
The eigenfrequency coarse value of optical fibre gyro particularly as follows:
fp=1/2 τ
Wherein: fpFor the eigenfrequency coarse value of optical fibre gyro, τ is:
τ=nl/c
Wherein: n is optical fibre refractivity, l is that fiber optic loop is long, and c is the light velocity.
B. the square-wave signal according to the generation modulation of eigenfrequency coarse value, and observe the output waveform of optical fibre gyro, specifically include step:
B1. digital square-wave generating assembly produces the digital square-wave of modulation according to eigenfrequency coarse value；
B2. digital square-wave is converted to analog square wave signal by digital analog converter 2；
B3. analog square wave signal is adjusted to the voltage amplitude of applicable optical fibre gyro modulation by discharge circuit 3.
C. judging whether output waveform is comb wave, if it has, then perform step D, terminate if it has not, then measure, the frequency of current square-wave signal is the eigenfrequency of optical fibre gyro；
As shown in Figure 2, when there is deviation with the eigenfrequency of optical fibre gyro self in the frequency of modulated square wave, the output waveform of optical fibre gyro is comb wave, along with modulating frequency is close to the eigenfrequency of gyro, dressing ripple spike can be more and more less, until modulating frequency very accurately time, namely with eigenperiod error less than 0.005 microsecond time, detector output will not have the spike of comb wave on oscillograph.
D. change the size of square-wave signal frequency, and perform step C.
Square-wave signal frequency change procedure in step D particularly as follows: change the count resets value of FPGA1 Counter by host computer 5, it is achieved FPGA1 produces the change of Digital Square-Wave model frequency.
Claims (10)
1. an optical fiber gyroscope eigenfrequency measurement device, including interconnective digital analog converter and discharge circuit, it is characterized in that, also include digital square-wave generating assembly and oscillograph, described discharge circuit is connected with the input of optical fibre gyro, the outfan of described optical fibre gyro is connected with oscillograph, and described digital square-wave generating assembly is connected with digital analog converter.
2. a kind of optical fiber gyroscope eigenfrequency measurement device according to claim 1, it is characterised in that described digital square-wave generating assembly includes the host computer, output interface and the FPGA that connect, and described FPGA is connected with digital analog converter.
3. a kind of optical fiber gyroscope eigenfrequency measurement device according to claim 2, it is characterised in that described measurement device also includes circuit board, and described output interface, FPGA, digital analog converter, discharge circuit are all integrated on circuit boards.
4. a kind of optical fiber gyroscope eigenfrequency measurement device according to claim 2, it is characterised in that described output interface is connected with host computer by RS422 communication cable or RS232 communication cable.
5. a kind of optical fiber gyroscope eigenfrequency measurement device according to claim 2, it is characterised in that described FPGA internal work clock operating frequencies is be more than or equal to 100MHz.
6. a kind of optical fiber gyroscope eigenfrequency measurement device according to claim 5, it is characterised in that described FPGA internal work clock operating frequencies is 400MHz.
7. the application process of an optical fiber gyroscope eigenfrequency measurement device as claimed in claim 2, it is characterised in that the method comprising the steps of:
A. the eigenfrequency coarse value of optical fibre gyro is obtained；
B. the square-wave signal of modulation is generated according to eigenfrequency coarse value；
C. digital square-wave generating assembly judges whether the output waveform of optical fibre gyro is comb wave, if it has, then perform step D, terminates if it has not, then measure, and the frequency of current square-wave signal is the eigenfrequency of optical fibre gyro；
D. digital square-wave generating assembly changes the size of square-wave signal frequency, and performs step C.
8. a kind of optical fiber gyroscope eigenfrequency measuring method according to claim 7, it is characterised in that the eigenfrequency coarse value of described optical fibre gyro particularly as follows:
fp=1/2 τ
Wherein: fpFor the eigenfrequency coarse value of optical fibre gyro, τ is:
τ=nl/c
Wherein: n is optical fibre refractivity, l is that fiber optic loop is long, and c is the light velocity.
9. a kind of optical fiber gyroscope eigenfrequency measuring method according to claim 7, it is characterised in that described step B specifically includes step:
B1. digital square-wave generating assembly produces the digital square-wave of modulation according to eigenfrequency coarse value；
B2. digital square-wave is converted to analog square wave signal by digital analog converter；
B3. analog square wave signal is adjusted to the voltage amplitude of applicable optical fibre gyro modulation by discharge circuit.
10. a kind of optical fiber gyroscope eigenfrequency measuring method according to claim 7, it is characterized in that, square-wave signal frequency change procedure in described step D particularly as follows: change the count resets value of FPGA Counter by host computer, it is achieved FPGA produces the change of Digital Square-Wave model frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410812214.9A CN105758421A (en) | 2014-12-19 | 2014-12-19 | Fiber-optic gyroscope eigenfrequency measuring equipment and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410812214.9A CN105758421A (en) | 2014-12-19 | 2014-12-19 | Fiber-optic gyroscope eigenfrequency measuring equipment and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105758421A true CN105758421A (en) | 2016-07-13 |
Family
ID=56341329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410812214.9A Pending CN105758421A (en) | 2014-12-19 | 2014-12-19 | Fiber-optic gyroscope eigenfrequency measuring equipment and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105758421A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106403994A (en) * | 2016-08-23 | 2017-02-15 | 中国航空工业集团公司西安飞行自动控制研究所 | Device and method for automatically debugging parameters of closed-loop fiber-optic gyroscope |
| CN107356266A (en) * | 2017-07-25 | 2017-11-17 | 北京航空航天大学 | Optical fiber gyroscope eigenfrequency measuring method based on even times of eigenfrequency saw wave modulator |
| CN107389097A (en) * | 2017-07-25 | 2017-11-24 | 北京航空航天大学 | Optical fibre gyro Sagnac fiber optic loop eigenfrequency tracking measurement methods |
| CN109557452A (en) * | 2018-11-28 | 2019-04-02 | 重庆华渝电气集团有限公司 | A kind of optical fibre gyro main circuit board detection method |
| CN112904070A (en) * | 2019-11-19 | 2021-06-04 | 许继集团有限公司 | All-fiber current transformer, detection module thereof and light path state diagnosis method |
| CN114264318A (en) * | 2021-12-06 | 2022-04-01 | 河北汉光重工有限责任公司 | Method and device for testing natural frequency of closed-loop fiber optic gyroscope |
| CN115143949A (en) * | 2022-09-05 | 2022-10-04 | 中国船舶重工集团公司第七0七研究所 | Ultrahigh-precision fiber gyroscope eigenfrequency compensation and fault diagnosis processing method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1967146A (en) * | 2006-11-24 | 2007-05-23 | 北京航空航天大学 | Measurement for eigenfrequency of interferometric type fiber-optic gyroscope by using asymmetrical square wave modulation method |
| 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 |
| US20090040526A1 (en) * | 2007-08-08 | 2009-02-12 | Ward Paul A | Interferometric fiber optic gyroscope with off-frequency modulation signals |
| CN101408425A (en) * | 2008-11-21 | 2009-04-15 | 中国航天时代电子公司 | Method for tracking optical fiber gyroscope eigenfrequency |
| CN102840869A (en) * | 2012-09-17 | 2012-12-26 | 北京航空航天大学 | Measuring method for fiber optic gyroscope eigenfrequency |
| CN103105177A (en) * | 2013-01-21 | 2013-05-15 | 湖北航天技术研究院总体设计所 | Low-cost method for measuring eigenfrequency of fiber-optic gyroscope |
-
2014
- 2014-12-19 CN CN201410812214.9A patent/CN105758421A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1967146A (en) * | 2006-11-24 | 2007-05-23 | 北京航空航天大学 | Measurement for eigenfrequency of interferometric type fiber-optic gyroscope by using asymmetrical square wave modulation method |
| US20090040526A1 (en) * | 2007-08-08 | 2009-02-12 | Ward Paul A | Interferometric fiber optic gyroscope with off-frequency modulation signals |
| 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 |
| CN101408425A (en) * | 2008-11-21 | 2009-04-15 | 中国航天时代电子公司 | Method for tracking optical fiber gyroscope eigenfrequency |
| CN102840869A (en) * | 2012-09-17 | 2012-12-26 | 北京航空航天大学 | Measuring method for fiber optic gyroscope eigenfrequency |
| CN103105177A (en) * | 2013-01-21 | 2013-05-15 | 湖北航天技术研究院总体设计所 | Low-cost method for measuring eigenfrequency of fiber-optic gyroscope |
Non-Patent Citations (1)
| Title |
|---|
| 周友伟等: "基于对称方波调制的光纤陀螺本征频率自动测试方法", 《激光与红外》 * |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106403994A (en) * | 2016-08-23 | 2017-02-15 | 中国航空工业集团公司西安飞行自动控制研究所 | Device and method for automatically debugging parameters of closed-loop fiber-optic gyroscope |
| CN106403994B (en) * | 2016-08-23 | 2019-10-18 | 中国航空工业集团公司西安飞行自动控制研究所 | A kind of automatic debugging device and method of closed-loop fiber optic gyroscope parameter |
| CN107389097B (en) * | 2017-07-25 | 2020-03-10 | 北京航空航天大学 | Method for tracking and measuring Sagnac optical fiber ring eigenfrequency of optical fiber gyroscope |
| CN107356266A (en) * | 2017-07-25 | 2017-11-17 | 北京航空航天大学 | Optical fiber gyroscope eigenfrequency measuring method based on even times of eigenfrequency saw wave modulator |
| CN107389097A (en) * | 2017-07-25 | 2017-11-24 | 北京航空航天大学 | Optical fibre gyro Sagnac fiber optic loop eigenfrequency tracking measurement methods |
| CN107356266B (en) * | 2017-07-25 | 2020-03-10 | 北京航空航天大学 | Fiber optic gyroscope eigenfrequency measurement method based on even-time eigenfrequency sawtooth wave modulation |
| CN109557452A (en) * | 2018-11-28 | 2019-04-02 | 重庆华渝电气集团有限公司 | A kind of optical fibre gyro main circuit board detection method |
| CN112904070A (en) * | 2019-11-19 | 2021-06-04 | 许继集团有限公司 | All-fiber current transformer, detection module thereof and light path state diagnosis method |
| CN112904070B (en) * | 2019-11-19 | 2023-12-29 | 许继集团有限公司 | All-fiber current transformer, detection module thereof and optical path state diagnosis method |
| CN114264318A (en) * | 2021-12-06 | 2022-04-01 | 河北汉光重工有限责任公司 | Method and device for testing natural frequency of closed-loop fiber optic gyroscope |
| CN114264318B (en) * | 2021-12-06 | 2024-06-11 | 河北汉光重工有限责任公司 | Method and device for testing natural frequency of closed-loop fiber optic gyroscope |
| CN115143949A (en) * | 2022-09-05 | 2022-10-04 | 中国船舶重工集团公司第七0七研究所 | Ultrahigh-precision fiber gyroscope eigenfrequency compensation and fault diagnosis processing method |
| WO2024051050A1 (en) * | 2022-09-05 | 2024-03-14 | 中国船舶集团有限公司第七〇七研究所 | Eigenfrequency compensation method for ultrahigh-precision fiber-optic gyroscope, and fault diagnosis and processing method therefor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105758421A (en) | Fiber-optic gyroscope eigenfrequency measuring equipment and application thereof | |
| CN102840869B (en) | Measuring method for fiber optic gyroscope eigenfrequency | |
| CN103591895B (en) | A kind of optical fiber length measuring system and measuring method | |
| CN111174773B (en) | Multi-phase modulation and demodulation fiber-optic gyroscope multi-closed-loop algorithm | |
| CN107356266B (en) | Fiber optic gyroscope eigenfrequency measurement method based on even-time eigenfrequency sawtooth wave modulation | |
| CN108801153B (en) | Optical fiber length measuring method and measuring device | |
| CN104990547B (en) | The method and apparatus that a kind of stable fiber gyro keeps constant multiplier | |
| CN102692314B (en) | Apparatus and method for testing power spectral density of frequency noise of laser based on fiber resonator | |
| CN103868530B (en) | A kind of method of testing of closed-loop fiber optic gyroscope angular acceleration tracking performance | |
| CN102650526B (en) | Open-loop detecting circuit for frequency modulated continuous wave optical fiber gyroscope based on phase comparison | |
| CN103115628B (en) | A kind of resonant mode optical gyroscope scale factor method of testing | |
| CN101839698A (en) | BOTDR (Brillouin Optical Time Domain Reflectometer) for calibrating optical power of reference light and calibrating method thereof | |
| WO2015158187A1 (en) | Single optical path laser ranging system | |
| CN100541127C (en) | Adopt the asymmetrical square wave modulator approach to measure the method for interference type optical fiber gyroscope eigenfrequency | |
| CN103984830A (en) | Simulation method for digital closed-loop control logic of fiber-optic gyroscope | |
| CN109931922A (en) | A kind of optical fibre gyro starting quick self-checking survey method | |
| CN101685113B (en) | Method and device for measuring phase shift | |
| CN100533064C (en) | Transit time testing method of fiber optic gyroscope | |
| CN103105177B (en) | Low-cost optical fiber gyro eigenfrequency measuring method | |
| CN103968821B (en) | Two-way resonance type optical gyroscope | |
| CN100533063C (en) | Method for separating thermal noise, shot noise and intensity noise of optical fiber gyroscope | |
| CN102003957A (en) | Four-frequency laser gyro zero offset compensation method | |
| CN216593446U (en) | Closed loop fiber optic gyroscope bandwidth test system | |
| CN1664538A (en) | On-line testing method and device for integrated optical modulator for optic fiber gyroscope | |
| CN104457792B (en) | A method of measuring optic fiber gyroscope graduation factor under without mechanical rotation condition |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160713 |
|
| RJ01 | Rejection of invention patent application after publication |