CN100570279C - Utilize photofading to realize the anti-irradiation reinforcement means of optical fibre gyro - Google Patents
Utilize photofading to realize the anti-irradiation reinforcement means of optical fibre gyro Download PDFInfo
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- CN100570279C CN100570279C CNB2006100112515A CN200610011251A CN100570279C CN 100570279 C CN100570279 C CN 100570279C CN B2006100112515 A CNB2006100112515 A CN B2006100112515A CN 200610011251 A CN200610011251 A CN 200610011251A CN 100570279 C CN100570279 C CN 100570279C
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Abstract
Utilize photofading to realize the anti-irradiation reinforcement means of optical fibre gyro, realize the method for anti-irradiation reinforcing for a kind of protection of taking the initiative, utilize the photofading principle of optical fiber under radiation environment, adopt high power semiconductor lasers in optical fibre gyro, to inject light laser, the tail optical fiber loss of optical fibre gyro inner fiber ring and all photoelectric devices is alleviated to some extent, thereby improved the anti-radiation performance of optical fibre gyro.Before utilizing, the present invention puts the signal feedback of output, control and adopt high power semiconductor lasers to carry out the startup of photofading and close, and the closing and start of corresponding optical fibre gyro demodulating system, adopt the photofading of discontinuity to handle, time is very short, when optical fibre gyro system was worked long hours, the continuity of output signal and the influence of accuracy were very little, helped the application of optical fibre gyro under space radiation environment.
Description
Technical field
A kind of anti-irradiation reinforcement means when the present invention relates to the application of optical fibre gyro space.
Background technology
Optical fibre gyro (FOG) is used in the space, and the influence that is subjected to space radiation can cause its performance to descend.The hundreds of rice that is about in the interference optical fiber top that adopts arrives several kilometers polarization-maintaining fiber coil (PM FiberCoil) at present, and the optical fiber pigtail of interior all photoelectric devices of optical fibre gyro, and the raying influence is more serious.Being embodied in optical fiber loss under radiation environment increases, reason is under the high-energy radiation effect, fiber cores quartz glass generation physics and chemical change (variable color, hardening, become fragile, decomposition, destruction etc.), produce various defectives (point defect, dislocation, colour center), thereby the optical transmission performance of optical fiber is worsened.Topmostly show as formation " colour center ".This be because, contain foreign ion Cl, OH and coloring ion in the quartz glass, produce impurity absorption loss, painted ions such as Fe, Cr, Mn, Cu, Co, Ni, Pb particularly, under the higher dosage radiation condition, the part free electron can be caught by these coloring ions in the optical fiber, thereby forms " colour center " in optical fiber, be new absorption band, fibre loss is increased.At present the anti-irradiation reinforcement measure of optical fibre gyro is generally passive protection, and the heavy metal shield by the optical fibre gyro shell improves its anti-radiation performance, and doing the weight that can cause optical fibre gyro like this increases.Satellite, aerospacecraft and various load etc. in the space environment are quite harsh to the requirement of weight, and too many weight increase is unallowed.
Summary of the invention
Technology of the present invention is dealt with problems: the deficiency that overcomes the passive protection technology, provide a kind of photofading that utilizes to realize the anti-irradiation reinforcement means of optical fibre gyro, adopt this method can be under the situation that does not increase optical fibre gyro weight, improve its radiation resistance, and utilize the signal feedback of optical fibre gyro inside, the application of control photofading.
Technical solution of the present invention: utilize photofading to realize the anti-irradiation reinforcement means of optical fibre gyro, its characteristics are: insert light laser in the light path of optical fibre gyro, the short time photofading that adopts high power semiconductor lasers to carry out discontinuity is handled, and can realize that the anti-irradiation of optical fibre gyro is initiatively reinforced.
Utilize the signal feedback of putting output before the gyro, control and adopt high power semiconductor lasers to carry out the startup of photofading and close, and the closing and start of corresponding optical fibre gyro demodulating system.
Principle of the present invention: from the optical fiber radiation effect, utilize itself intrinsic character-photofading, adopt high power semiconductor lasers that the optical fibre gyro light path part under the radiation environment is carried out discontinuity, the photofading of short time is handled, improve the anti-radiation performance of the optical fiber pigtail of optical fibre gyro inner fiber ring and all photoelectric devices, thereby improve the anti-radiation performance of optical fibre gyro, and put the signal feedback of output before utilizing, application to photofading is controlled, when the irradiated influence of optical fibre gyro and the system that has influence on separates timing, in time it is carried out photofading and handle, guarantee the operate as normal of optical fibre gyro.
The present invention's advantage compared with prior art is:
(1) do not need the heavy metal of optical fibre gyro shell is protected, adopt the character of optical fibre gyro inner fiber to carry out the active protection, the feedback of discharge signal before utilizing is controlled the application and the gyro demodulating system work accordingly of photofading effectively.
(2) the present invention has solved the anti-radiation performance problem of the tail optical fiber of optical fibre gyro internal optical fiber ring and all photoelectric devices by photofading and effective feedback control; Whole proposal does not consider it is the radiation dose rate or the exercising result of accumulated dose from the angle of irradiation to the gyrosystem demodulation, is applicable to the uncertain radiation environment of space dose rate.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is a workflow diagram of the present invention;
Polarization-maintaining fiber coil loss curve over time when Fig. 3 is 0.01rad/s, 1rad/s, 2rad/s for radiation dose rate;
Fig. 4 is 1300nm high power semiconductor lasers (LD) injects 0.3mw in optical fiber loop a luminous power when carrying out photofading for adopting wavelength, and fibre loss is curve over time;
Fig. 5 is 2rad/s for dose rate, and luminous power is 0.3mw, 0.2mw, 0.1mw photofading loss change curve.
Embodiment
As shown in Figure 1, the measure that the present invention mainly takes is: add high power semiconductor lasers LD and be used to carry out the photofading processing, in the light path of optical fibre gyro, inject light laser, adopt high power semiconductor lasers to carry out discontinuity, short time photofading processing, can realize that the anti-irradiation of optical fibre gyro is initiatively reinforced.
Put the application and the open and close of optical fibre gyro circuit demodulating system accordingly of the signal feedback control photofading of output before the utilization.During the optical fibre gyro operate as normal, system's demodulation has the minimum requirement to preceding putting output signal.In the space environment, optical fibre gyro is influenced by irradiation, and the loss of the tail optical fiber of fiber optic loop and all photoelectric devices increases, and causes arriving the optical power down of detector, and the preceding output signal of putting diminishes, and influences system's demodulation.Whether discharge signal satisfies the minimum requirement before adding logic determines.
Above-mentioned discontinuity refers to: it is not continuous that photofading is handled, and is that free otherwise optical fibre gyro is be in photofading the processing stage always at interval, and the gyro demodulating system can't be carried out demodulation, and optical fibre gyro can't operate as normal.Be between twice photofading handled break time, the time of gyro operate as normal.
The principle of photofading is to utilize high light that the colour center concentration in the optical fiber is reduced, and optical fiber property is recovered to some extent.Because photofading is the short time effect, after the time was long, optical fiber reached equilibrium state, and the effect of photofading is just very little.Time does not need oversize, in this programme the photofading processing procedure is set at 4-6 minute.As shown in Figure 2, the course of work of the present invention: gyro powers up work, and the detection to preceding discharge signal when powering up is carried out synchronously.If before put output signal and satisfy the minimum requirement, no any action in the gyro, promptly gyro is worked as usual; If before put output signal less than the minimum requirement, close gyro demodulator circuit part, open LD and carry out photofading and handle.After 4-6 minute, close LD, open the gyro demodulating system, continue the output signal of preceding putting is detected,, keep gyro to continue operate as normal if satisfy system's demodulation requirement.If still do not meet the demands, repeat photofading and handle, satisfy the minimum requirement up to preceding putting output signal, the optical fibre gyro demodulating system can power up and work on.
When photofading is handled, closing the gyro demodulator circuit, is because the light in the optical fibre gyro is constant polarized light, and this is the basic demand that the Sagnac effect produces in the optical fibre gyro.Directly do not carry out the photofading processing if do not close the gyro demodulator circuit, directly join in the optical fibre gyro system light of LD, cause the light signal character of light path to change, can't interfere and produce optics Sagnac effect, and the light intensity that detector is surveyed can not correctly reflect interference light intensity, the most basic condition of whole optical fibre gyro operate as normal is broken by bad, and optical fibre gyro system can't be worked.
It is as follows to adopt high power semiconductor lasers LD to carry out the experimental study that photofading handles: polarization-maintaining fiber coil loss curve over time when Fig. 4 is 0.01rad/s, 1rad/s, 2rad/s for radiation dose rate.Fig. 5 is 1300nm high power semiconductor lasers (LD) injects 0.3mw in optical fiber loop a luminous power when carrying out photofading for adopting wavelength, and fibre loss is curve over time.In optical fibre gyro, the luminous power in the fiber optic loop is about 20 microwatts.Join luminous power in the fiber optic loop during photofading through after the coupling mechanism beam splitting, the splitting ratio of coupling mechanism is not desirable 50%, and the light source power 0.9mw of laser instrument joins after beam splitting and the loss and is 0.3mw in the fiber optic loop.Temperature is 25 ℃ of room temperatures.Upcurve is radiation dose rate photofading curve when being 1rad/s, and decline curve is the photofading curve that stops behind the irradiation.Radiation dose rate is the curve of 1rad/s among comparison diagram 4 and Fig. 5, and as can be seen, in same radiation environment, the curve when having the ratio of photofading not have photofading rises slowly, illustrates that the loss increase slows down, photofading generation effect.After stopping irradiation, the effect of photofading is the most tangible, and loss returns to the radiation state before that applies nearly.Fig. 5 is 2rad/s for dose rate, and luminous power is 0.3mw, 0.2mw, 0.1mw photofading loss change curve, and as can see from Figure 5, luminous power is big more, and the photofading effect is obvious more.
Test at be to be about 500 meters polarization-maintaining fiber coil, obvious from the proof photofading effect of test figure.Optical fibre gyro is the most affected tail optical fiber that is polarization-maintaining fiber coil and each photoelectric device under radiation parameter.Utilize photofading that the loss of tail optical fiber under radiation parameter of polarization-maintaining fiber coil and each photoelectric device alleviated to some extent, thereby improve the anti-radiation performance of optical fibre gyro integral body.
Claims (2)
1, utilize photofading to realize the anti-irradiation reinforcement means of optical fibre gyro, it is characterized in that: in the light path of optical fibre gyro, inject light laser, the photofading that adopts high power semiconductor lasers to carry out discontinuity is handled, the time of photofading is 4-6 minute, can realize that the anti-irradiation of optical fibre gyro is initiatively reinforced.
2, the photofading that utilizes according to claim 1 is realized the anti-irradiation reinforcement means of optical fibre gyro, it is characterized in that: utilize the signal feedback of putting output before the gyro, control the discontinuity that adopts high power semiconductor lasers to carry out photofading and start and close, and the closing and start of corresponding optical fibre gyro demodulating system.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100112515A CN100570279C (en) | 2006-01-23 | 2006-01-23 | Utilize photofading to realize the anti-irradiation reinforcement means of optical fibre gyro |
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| CNB2006100112515A CN100570279C (en) | 2006-01-23 | 2006-01-23 | Utilize photofading to realize the anti-irradiation reinforcement means of optical fibre gyro |
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| CN100570279C true CN100570279C (en) | 2009-12-16 |
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| CN100494897C (en) * | 2006-12-31 | 2009-06-03 | 中国航天时代电子公司 | Optical fiber gyroscope using mixed optical path of polarization maintaining and low polarization |
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| Feasibility of optical sensing for robotics in highly radioactiveenvironments. Coenen S ETL.IEEE TRANSACTION ON NUCLEAR SCIENCE,Vol.40 No.4. 1993 |
| Feasibility of optical sensing for robotics in highly radioactiveenvironments. Coenen S ETL.IEEE TRANSACTION ON NUCLEAR SCIENCE,Vol.40 No.4. 1993 * |
| Radiation hardening of pure-silica-core optical fibersbyultra-high-dose lambda-ray pre 0irradiation. Griscom DL etl.Journal of Applied Physics,Vol.77 No.10. 1995 |
| Radiation hardening of pure-silica-core optical fibersbyultra-high-dose lambda-ray pre 0irradiation. Griscom DL etl.Journal of Applied Physics,Vol.77 No.10. 1995 * |
| 卫星用光纤陀螺中抗辐射光纤的研究. 张玉艳等.光学与光电技术，第3卷第1期. 2005 |
| 卫星用光纤陀螺中抗辐射光纤的研究. 张玉艳等.光学与光电技术，第3卷第1期. 2005 * |
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| 石英光纤抗辐照加固的研究. 李荣玉等.上海交通大学学报，第34卷第2期. 2000 * |
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