CN101216368A - Optical fibre coupler performance test method and apparatus for optical fibre gyroscope - Google Patents
Optical fibre coupler performance test method and apparatus for optical fibre gyroscope Download PDFInfo
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- CN101216368A CN101216368A CNA2008100594288A CN200810059428A CN101216368A CN 101216368 A CN101216368 A CN 101216368A CN A2008100594288 A CNA2008100594288 A CN A2008100594288A CN 200810059428 A CN200810059428 A CN 200810059428A CN 101216368 A CN101216368 A CN 101216368A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 8
- 238000011056 performance test Methods 0.000 title description 4
- 238000012360 testing method Methods 0.000 claims abstract description 31
- 230000008878 coupling Effects 0.000 claims abstract description 20
- 238000010168 coupling process Methods 0.000 claims abstract description 20
- 238000005859 coupling reaction Methods 0.000 claims abstract description 20
- 230000004044 response Effects 0.000 claims abstract description 4
- 239000000835 fiber Substances 0.000 claims description 38
- 230000007246 mechanism Effects 0.000 claims description 18
- 230000003287 optical effect Effects 0.000 claims description 13
- 238000010998 test method Methods 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 230000008676 import Effects 0.000 claims description 2
- 238000013480 data collection Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000013097 stability assessment Methods 0.000 description 1
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Abstract
The invention discloses a method and a device for testing vibration performance of an optical fiber coupler for an optical fiber gyroscope. The method comprises the following steps of: coupling a high-stability light source provided by a test system with the optical fiber coupler to be measured for measuring indexes of the device such as loss and splitting ratio; fixing the optical fiber coupler to be measured on an electric-control vibration platform through a clamp, setting vibration parameters by the vibration controller according to the test requirement, applying vibration to the coupler, converting a light intensity signal modulated by vibration into an electrical signal by a photodetector and a preamplifier, demodulating the signal, and outputting the demodulated signal to a computer for data collection, thus obtaining the dynamic response performance of the splitting ratio to the vibration of the optical fiber coupler.
Description
Technical field
The present invention relates to fiber coupler vibration performance method of testing and device that a kind of optical fibre gyro is used.
Background technology
Optical fibre gyro (FOG) is the core component of contemporary inertia system, and is all solid state, shock-resistant, can adapt to abominable advantages such as mechanical environment and expanded the application of optical fibre gyro widely.The engineering practicability of low-precision optical fiber gyro during internal optical fiber gyro research institute is making great efforts to advance at present, wherein the mechanical environment characteristic issues of device is one of key issue that needs to be resolved hurrily at present.
Optical fibre gyro is generally adopted X (or Y type) type fusion coupling mechanism with fiber coupler, and it adopts the fused biconical taper method to be made, and finally forms the special Wave guide structure of bipyramid form in the heating zone, realizes the transmitting optical power coupling.In the interference optical fiber top structure, fiber coupler is input to fiber optic loop to the light wave of light source (SLD) on the one hand, on the other hand the light intensity that has angular speed information is outputed to detector.The test of this device is the test of device nominal parameters at present, has: insert loss, splitting ratio, homogeneity, isolation, directivity, Polarization Dependent Loss, the application with optical fibre gyro on method of testing and test environment etc. are every has bigger difference.And under mechanical environments such as vibration, impact, the variation of these parameters of fiber coupler can cause gyro signal to have a strong impact on.
The test of vibration performance can't accomplish that in the conventionally test of device characteristic examination in actual applications brings defective to device for this.Therefore, as an important light path element in the optical fibre gyro, grasp its vibration performance and the influence of gyro signal is necessary.
Summary of the invention
In order to overcome the deficiency in the background technology, the object of the present invention is to provide a kind of optical fibre gyro to use fiber coupler vibration performance method of testing and device, can realize the test of device vibration performance, and some key parameters to device can be tested, examine in the environment of optical fibre gyro practical application, the stepping row filter of going forward side by side.
The technical solution adopted for the present invention to solve the technical problems is:
1, the fiber coupler vibration performance method of testing used of a kind of optical fibre gyro:
1) test macro add electric preheating stable after, the high stable light source is coupled into the fiber coupler that is installed on the shaking table from the first optical interface A1, at the power of the first optical interface A1 place testing light source, promptly imports the luminous power P of tested optical fiber coupling mechanism
0Two output ports of fiber coupler enter the first photodetector B1 through the second optical interface A2 respectively, and the 3rd optical interface A3 enters the second photodetector B2, and recording its power respectively is P
1, P
2, obtain the splitting ratio of coupling mechanism;
2) set the shaking table parameter, fiber coupler is carried out vibration-testing, through photodetector and prime amplifier the light intensity signal that is subjected to vibration modulation is converted to electric signal, the demodulation of process signal outputs to computing machine and carries out data acquisition, obtains the dynamic response characteristic of fiber coupler splitting ratio to vibration.
The super-radiance light emitting diode SLD that described high stable light source is a wide range.
2, the fiber coupler vibration performance proving installation used of a kind of optical fibre gyro:
Comprise high stable light source, photodetector and prime amplifier, automatically controlled shaking table, vibrating controller, signal demodulation part, computing machine, vibration-isolating platform, fiber coupler; Automatically controlled shaking table is installed on the vibration-isolating platform, fixed fiber coupling mechanism on the automatically controlled shaking table, the input end of the output of high stable light source and tested optical fiber coupling mechanism joins, the fiber coupler output terminal enters demodulator of PM signal PM after photodetector and the conversion of prime amplifier light intensity signal, be connected with computing machine, vibrating controller links to each other with demodulator of PM signal PM with automatically controlled shaking table respectively.
The beneficial effect that the present invention compared with prior art has is:
Optical fibre gyro is not only tested the nominal parameters of fiber coupler with fiber coupler vibration performance method of testing, has increased the dynamic test parameter of vibration performance and system responses simultaneously; Stability assessment for fiber coupler is strengthened, and helps fiber coupler and uses in optical fibre gyro; Test parameter is more comprehensive, can in a cover system key parameter be measured successively, but comparative is strengthened greatly.So this test macro can satisfy the test of fiber coupler key parameter under the gyro vibration environment.
Description of drawings
Fig. 1 is a test flow chart of the present invention.
Fig. 2 is a fiber coupler conventional parameter test synoptic diagram.
Fig. 3 is the test synoptic diagram of fiber coupler vibration performance of the present invention.
Fig. 4 is a coupling mechanism vibration performance test curve of the present invention.
Embodiment:
Testing process of the present invention is as shown in Figure 1:
(1) test macro adds electric preheating and stablizes a period of time;
(2) as shown in Figure 2, be fiber coupler conventional parameter proving installation.High stable light source 1 at the power of optical interface A1 place testing light source, is promptly imported the luminous power P of tested optical fiber coupling mechanism 8 from optical interface A1 coupled into optical fibres coupling mechanism 8
0Two output ports of fiber coupler 8 are through optical interface A2, and A3 enters photodetector B1, and B2 records its power and is respectively P
1, P
2, can obtain coupling mechanism splitting ratio, insert parameter such as loss;
(3) as shown in Figure 3, be the proving installation of fiber coupler vibration performance of the present invention.Test macro is by high stable light source 1, photodetector and prime amplifier 2, automatically controlled shaking table 3, vibrating controller 4, demodulator of PM signal PM 5, computing machine 6, vibration-isolating platform 7, fiber coupler 8.The input end of the output of high stable light source 1 and tested optical fiber coupling mechanism 8 joins, for whole test system provides light wave; Tested fiber coupler is fixed on the shaking table 3 with the anchor clamps that design, and vibrating controller 4 can be set the vibrational excitation parameter by test request; Detector and prime amplifier 2 are converted to electric signal with the light signal of whole test system, carry out importing computing machine 6 data acquisitions behind the correlation demodulation through demodulator of PM signal PM 5, obtain the splitting ratio modulation amplitude of tested optical fiber coupling mechanism 8.Testing procedure is as follows: the dc offset voltage that records during input that test macro is unglazed is V
1, to open light source adjustment output power and guarantee that photodetector is operated in linear best zone, the bias voltage that record this moment is V
2, tested optical fiber coupling mechanism 8 is carried out deciding frequency or frequency sweep (in the 2000Hz, meeting the vibration examination frequency range of gyro), vibrating controller is set and begins vibration by test request, the bias voltage that record this moment is V
3, by calculating the amplitude that can obtain tested optical fiber coupling mechanism 8 splitting ratio vibration modulation, its computing formula is Δ R=V
3/ (V
2-V
1).Fig. 4 is a coupling mechanism vibration performance test curve of the present invention.
Claims (3)
1. fiber coupler vibration performance method of testing that optical fibre gyro is used is characterized in that:
1) test macro add electric preheating stable after, the high stable light source is coupled into the fiber coupler that is installed on the shaking table from the first optical interface A1, at the power of the first optical interface A1 place testing light source, promptly imports the luminous power P of tested optical fiber coupling mechanism
0Two output ports of fiber coupler enter the first photodetector B1 through the second optical interface A2 respectively, and the 3rd optical interface A3 enters the second photodetector B2, and recording its power respectively is P
1, P
2, obtain the splitting ratio of coupling mechanism;
2) set the shaking table parameter, fiber coupler is carried out vibration-testing, through photodetector and prime amplifier the light intensity signal that is subjected to vibration modulation is converted to electric signal, the demodulation of process signal outputs to computing machine and carries out data acquisition, obtains the dynamic response characteristic of fiber coupler splitting ratio to vibration.
2. optical fibre gyro according to claim 1 is characterized in that: the super-radiance light emitting diode SLD that described high stable light source is a wide range with fiber coupler vibration performance method of testing.
3. fiber coupler vibration performance proving installation that optical fibre gyro is used, it is characterized in that: comprise high stable light source (1), photodetector and prime amplifier (2), automatically controlled shaking table (3), vibrating controller (4), signal demodulation part (5), computing machine (6), vibration-isolating platform (7), fiber coupler (8); Vibration-isolating platform (7) is gone up automatically controlled shaking table (3) is installed, automatically controlled shaking table (3) is gone up fixed fiber coupling mechanism (8), the input end of the output of high stable light source (1) and tested optical fiber coupling mechanism (8) joins, fiber coupler (8) output terminal enters demodulator of PM signal PM (5) after photodetector and the conversion of prime amplifier (2) light intensity signal, be connected with computing machine (6), vibrating controller (4) links to each other with demodulator of PM signal PM (5) with automatically controlled shaking table (3) respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008100594288A CN101216368A (en) | 2008-01-21 | 2008-01-21 | Optical fibre coupler performance test method and apparatus for optical fibre gyroscope |
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| CNA2008100594288A CN101216368A (en) | 2008-01-21 | 2008-01-21 | Optical fibre coupler performance test method and apparatus for optical fibre gyroscope |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101793530B (en) * | 2010-02-08 | 2012-07-18 | 长沙高新开发区迪内斯电子科技发展有限公司 | Method for measuring decoupling factor of optical fiber gyro |
| CN103115748A (en) * | 2013-01-25 | 2013-05-22 | 哈尔滨工程大学 | Fiber-optic gyroscope light source reliability detecting method based on Bayesian theory |
| CN103884355A (en) * | 2014-03-25 | 2014-06-25 | 北京航天控制仪器研究所 | Three-floating gyro calibration test system |
| RU2607729C1 (en) * | 2015-09-04 | 2017-01-10 | Открытое акционерное общество Всероссийский научно-исследовательский, проектно-конструкторский и технологический институт кабельной промышленности (ВНИИ КП) | Device for testing cable to be laid inside rooms and stationary objects |
| CN106370202A (en) * | 2016-10-11 | 2017-02-01 | 北京航空航天大学 | Online testing method and device for comprehensive performance of detector for gyroscope |
| CN107490392A (en) * | 2017-08-08 | 2017-12-19 | 湖北三江航天红峰控制有限公司 | Splitting ratio measuring system and method in a kind of fiber optic loop/Y waveguide direct-coupling module |
| CN108917792A (en) * | 2018-06-27 | 2018-11-30 | 北京航空航天大学 | A kind of interference type optical fiber gyroscope optical power on-line monitoring method based on inverse demodulation |
| CN109631974A (en) * | 2018-12-25 | 2019-04-16 | 西南技术物理研究所 | A kind of quadrant class photodetector energization vibration test tooling |
| CN113252071A (en) * | 2021-04-20 | 2021-08-13 | 北京航天时代光电科技有限公司 | Critical angle acceleration test system and test method based on double fiber-optic gyroscope |
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2008
- 2008-01-21 CN CNA2008100594288A patent/CN101216368A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101793530B (en) * | 2010-02-08 | 2012-07-18 | 长沙高新开发区迪内斯电子科技发展有限公司 | Method for measuring decoupling factor of optical fiber gyro |
| CN103115748A (en) * | 2013-01-25 | 2013-05-22 | 哈尔滨工程大学 | Fiber-optic gyroscope light source reliability detecting method based on Bayesian theory |
| CN103115748B (en) * | 2013-01-25 | 2015-02-18 | 哈尔滨工程大学 | Fiber-optic gyroscope light source reliability detecting method based on Bayesian theory |
| CN103884355A (en) * | 2014-03-25 | 2014-06-25 | 北京航天控制仪器研究所 | Three-floating gyro calibration test system |
| CN103884355B (en) * | 2014-03-25 | 2016-06-01 | 北京航天控制仪器研究所 | A kind of three floating Gyro Calibration test macros |
| RU2607729C1 (en) * | 2015-09-04 | 2017-01-10 | Открытое акционерное общество Всероссийский научно-исследовательский, проектно-конструкторский и технологический институт кабельной промышленности (ВНИИ КП) | Device for testing cable to be laid inside rooms and stationary objects |
| CN106370202A (en) * | 2016-10-11 | 2017-02-01 | 北京航空航天大学 | Online testing method and device for comprehensive performance of detector for gyroscope |
| CN107490392A (en) * | 2017-08-08 | 2017-12-19 | 湖北三江航天红峰控制有限公司 | Splitting ratio measuring system and method in a kind of fiber optic loop/Y waveguide direct-coupling module |
| CN107490392B (en) * | 2017-08-08 | 2020-07-14 | 湖北三江航天红峰控制有限公司 | System and method for measuring light splitting ratio in optical fiber ring/Y waveguide direct coupling module |
| CN108917792A (en) * | 2018-06-27 | 2018-11-30 | 北京航空航天大学 | A kind of interference type optical fiber gyroscope optical power on-line monitoring method based on inverse demodulation |
| CN108917792B (en) * | 2018-06-27 | 2021-05-07 | 北京航空航天大学 | Interference type optical fiber gyroscope optical power online monitoring method based on inverse demodulation |
| CN109631974A (en) * | 2018-12-25 | 2019-04-16 | 西南技术物理研究所 | A kind of quadrant class photodetector energization vibration test tooling |
| CN109631974B (en) * | 2018-12-25 | 2021-01-08 | 西南技术物理研究所 | Quadrant class photoelectric detector circular telegram vibration test frock |
| CN113252071A (en) * | 2021-04-20 | 2021-08-13 | 北京航天时代光电科技有限公司 | Critical angle acceleration test system and test method based on double fiber-optic gyroscope |
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