CN1333276C - Liquid filling shock isolation encapsulation technology for optical fibre grating - Google Patents
Liquid filling shock isolation encapsulation technology for optical fibre grating Download PDFInfo
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- CN1333276C CN1333276C CNB031235018A CN03123501A CN1333276C CN 1333276 C CN1333276 C CN 1333276C CN B031235018 A CNB031235018 A CN B031235018A CN 03123501 A CN03123501 A CN 03123501A CN 1333276 C CN1333276 C CN 1333276C
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- pressure
- fiber grating
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Abstract
The present invention relates to a liquid filling shock isolation packing technology for an optical fiber grating, which is a practical packing technology which can ensure the stable work wavelength of the optical fiber grating and compensate temperature; the present invention can be widely applied to light communication aspects. The technology adopts material with the certain requirement of physical characteristics as a packing outer shell (such as duralumin material); both ends of the packing outer shell and the optical fiber grating are sealed by adopting an oil seal technology; liquid (such as silicone) with a certain pressure is filled in the packing outer shell; an optical fiber grating temperature compensation loading stage (such as a loading stage made of ceramic with negative temperature coefficients or duplex metal material) is connected with and fixed to the outer shell through a gasket. Both ends of the optical fiber grating is fixed on the platform and are exposed in the liquid. The shock isolating packing outer shell is provided with a liquid filling port for filling liquid, the shock isolating packing outer shell is also provided with an interface connected with a pressure meter for connecting with the pressure meter for observing the liquid pressure in a cavity in real time. The device can realize shock isolation and automatically keep the purpose of stable work wavelength of the optical fiber grating.
Description
Affiliated technical field
The present invention relates to a kind of temperature compensation encapsulation technology of stable fiber grating operation wavelength, it can adjust the work operation wavelength of fiber grating automatically to remain on steady state (SS).
Background technology
Fiber grating as fiber grating filter, fibre-optical grating compensator with dispersion, OADM (light top and bottom path device) etc., must encapsulate fiber grating and annex thereof when being made into device.Because fiber grating counter stress and temperature is very responsive, when outer bound pair fiber grating temperature influence and external force are done the time spent, the operation wavelength of fiber grating will be drifted about, and this is very unfavorable for present DWDM (dense wave division multipurpose) The Application of Technology, even falls flat.Therefore, solve temperature and stress normally adopt temperature compensation and shock insulation encapsulation to the influence of fiber grating technology.
With regard to encapsulation technology, common simplified package and vacuum sealing technique are arranged at present.Common encapsulation is a kind of simple external packing, is equivalent to the casing of a machine, only plays decoration function, can't reach the effect of shock insulation; The vacuumizing method that vacuum sealing technique adopt to be removed the media of transmitting vibrations reaches the purpose of shock insulation, but this technology exists the technical matters complexity, and the financial cost height, the production cycle is long and many shortcomings such as difficult in maintenance.
Summary of the invention
We have proposed the hydraulic pressure method for packing for this reason, have that technology is simple, with low cost, production and processing speed is fast, isolating affection good and safeguard plurality of advantages such as simple, can overcome and solve the shortcoming of vacuum sealing technique and simplified package technology fully.
The technical solution adopted for the present invention to solve the technical problems
The liquid filling method for packing that we propose promptly is to be sealed in fiber grating in the can and to leave interface to be connected with the outside.Again seal fluid is sealed in the can, seal fluid keeps High Voltage, and the coefficient of volumetric expansion of sealing liquid equates with the coefficient of volumetric expansion of can.Having a temperature compensation microscope carrier to be used for that seal fluid is carried out monitoring temperature and real-time adjusting temperature in the can makes temperature keep constant.Can has a liquid injection port in order to injecting fluid in annular seal space; Also have the interface of a test pressure meter to be used for the pressure of seal fluid in the real-time monitoring can in addition.
According to the optical fiber mode coupled wave theory, when forward and reverse light wave transmits in fiber grating, form the mode coupling position condition that is complementary and satisfy following Bragg equation
λ
B＝2n
effΛ (1)
Λ is the grating cycle in the formula, n
EffBe effective refractive index, Λ and n
EffAll be affected by the external environment and change Δ Λ and Δ n
Eff, cause meeting the reflection wavelength generation shifts delta λ of Bragg condition.Can get by the Bragg condition
Δλ＝2Δn
effΛ+2n
effΔΛ (2)
This formula shows that the variation of the effective refractive index of reflection wavelength skew and fiber cores and grating constant is relevant.When fiber grating is subjected to stress or variation of temperature and influences, n
EffAll can change with Λ.Photoelastic effect under the stress causes variations in refractive index, and deformation changes grating constant; The photo-thermal effect that temperature causes changes effective refractive index, and thermal expansivity causes grating constant to change.
1. when fiber grating is subjected to stress, have
Δλ
B/λ
B＝(1-P)E (3)
Wherein E is strain, and μ is a Poisson ratio, and P is the fiber grating strain sensitivity coefficient.For silica fibre, desirable
Δλ
B/λ
B＝0.78E (4)
If extraneous stress can be regarded not a varying stress and a disturbance stress sum as, correspondingly the strain in the fiber grating also can show be
E＝E
0+ΔE (5)
When satisfy Δ E＜＜E
0The time, then (4) can be rewritten as
Δλ
B/λ
B≈0.78E
0 (6)
Promptly when fiber grating was placed in the higher container of liquid pressure of a sealing, the pressure in the container was a constant, and the strain in the corresponding fiber grating also is a constant E
0, and external shock is corresponding to having produced a disturbance Δ E that strain is small on fiber grating, the constant strain E in its relative fiber grating
0Be (realizing by the pressure of regulating in the container) can ignore in a small amount the time, this pressurising method just can realize the effect of shock insulation fully, thereby keeps the operation wavelength of fiber grating constant; Experimental result shows that when no shock insulation encapsulated, the centre wavelength of fiber grating was along with the external shock random variation; After adopting the shock insulation encapsulation, when impacting the encapsulation outer wall, its centre wavelength is very stable, thereby has verified the correctness of above-mentioned theory and technology.
2. when optical fiber grating temperature changes:
Δλ
B/λ
B＝(α+ζ)ΔT (7)
Wherein α is a thermal expansivity, and ζ is a thermo-optical coeffecient.For germanium-doped silica fiber, α gets 5.5 * 10
-7/ ℃, ζ gets 7.1 * 10
-6～7.3 * 10
-6/ ℃ (in 20～150 ℃ scope), 1 * 10
-5/ ℃ (in the time of 400 ℃).By formula (7) as can be known, Δ λ
BT exists linear relationship with Δ.
When outer bound pair annular seal space has thermal perturbation, temperature compensation microscope carrier (negative temperature coefficient ceramics) causes the length variations of self because of temperature variation, and then make the length that is attached to the fiber grating on the pottery produce respective change, because fiber grating is equivalent to change of refractive for variation of temperature, and the length variations effect of fiber grating also is equivalent to change of refractive, the change of refractive that causes so the variations in refractive index that can utilize the length variations of fiber grating to cause is offset the temperature variation of fiber grating;
3. when the thermal perturbation of outer bound pair annular seal space has influence on liquid pressure in the annular seal space, when the constancy of volume of liquid, the pressure of liquid and the temperature of liquid also are linear proportional relation.When the thermal expansivity of can and liquid is identical, the volume change of liquid will be identical with the volume change of annular seal space, and will be synchronous thereby volume change can guarantee with temperature variation, and then make the liquid pressure in the annular seal space constant.In the middle of experiment, the material and the liquid of the can that we adopt are respectively duralumin and silicone oil.
4. when the pressure of annular seal space changes, there is test pressure meter interface that it is tested, if find that trend that pressure has a reduction just can be by keeping invariablenes pressure of liquid in the annular seal space to sealing the intracavitary administration seal fluid, just shielded the disturbance of outer bound pair fiber grating by above-mentioned three kinds of ways, fiber grating is operated under the constant condition.
The invention has the beneficial effects as follows: can overcome and solve the shortcoming of vacuum sealing technique and simplified package technology fully, and with low cost, favorable repeatability, good stability.
Description of drawings:
Among the last figure, (1) is cylindric steel pipe, (2) be outside rubber sleeve, (3) be can, (4) be the natural gum of oil-sealing arrangement, (5) be seal fluid, (6) be pad, (7) be inner rubber bush, (8) be the temperature compensation microscope carrier, (9) be fiber grating, (10) be fixing natural gum, (11) the inside blind nut of oil-sealing arrangement, (12) liquid that oil-sealing arrangement sealed, (13) the outside blind nut of oil-sealing arrangement, (14) the outside rubber sheet gasket of oil-sealing arrangement, (15) be optical fiber pigtail, (16) be liquid injection port, (17) be the pressure measurement pressure tap
Embodiment
Can is cylindric, and liquid injection port and test pressure meter interface are arranged respectively at its sidewall two ends; Rubber bush also is cylindric, rubber bush pastes closely mutually with the external seal shell, end in the rubber bush inboard is used for fixing pad by circular projection and pad mechanical connection, the annulus projection of the other end then directly links to each other with the temperature compensation microscope carrier and plays a supportive role, and this annulus projection with the direction of cylinder spindle parallel centrosymmetric be distributed with circular hole so that liquid can be about it two chambeies penetrating; Pad and temperature compensation microscope carrier machinery links to each other and plays a supportive role, pad be symmetrically distributed with circular hole at direction center with the cylinder spindle parallel so that liquid can be about it two chambeies penetrating; Fiber grating is bonded on the temperature compensation microscope carrier by natural gum; Optical fiber pigtail also is adhesively fixed with steel pipe K by natural gum; Oil-sealing arrangement guarantees the sealing of can at the can two ends.
Oil-sealing arrangement: on the wall of can side chamber, have a circle the hole so that cylindric steel pipe see through, circular hole is coaxial therewith respectively opens a screw in the can inboard and the outside, two screws directly do not communicate, inboard screw seals with a thin blind nut, and oil sealing therein is so that isolated with annular seal space; The screw in the outside with a bolt identical with the steel pipe outside diameter to play the effect that completely cuts off with annular seal space; The end of columned steel pipe in can is with gummy fixed fiber tail optical fiber and play a part with annular seal space isolated, there is the rubber sheet gasket of layering steel pipe outside outside can, further seal, at outer wrap one deck rubber sleave of rubber sheet gasket to guarantee the attractive in appearance of convenient and outward appearance.
Claims (5)
1. a fiber grating liquid is filled the shock insulation method for packing, it is characterized in that: fiber grating, negative temperature compensation pottery, the connection of annular gasket sequential machine also are exposed in the interior highly pressurised liquid of outer package shell, fill liquid outside in the package casing with certain pressure intensity, by in liquid, applying the drift that steady pressure comes limit fibre grating centre wavelength, thereby offset the wavelength disturbance that extraneous random vibration or temperature variation are brought, thereby reach the shock insulation purpose.
2. the method for claim 1, it is characterized in that: adopt the thermal expansivity of outer package shell and the close method of liquid thermal expansion coefficient that the interior sealing of outer package shell is filled, the invariablenes pressure of liquid of seal fluid when realizing temperature variation, thus the pressure in the outer package shell is constant when guaranteeing temperature variation.
3. method as claimed in claim 1 or 2, it is characterized in that: also have a pressure measurement pressure tap in this outer package shell, monitor liquid pressure in the outer package shell by connecting pressure gauge, when pressure reduces, keep invariablenes pressure of liquid in the outer package shell by injection sealing liquid in the outside package casing.
4. method as claimed in claim 1 or 2 is characterized in that: described outer package shell is made by duralumin, and liquid is silicone oil in the described outer package shell.
5. method as claimed in claim 3 is characterized in that: described outer package shell is made by duralumin, and liquid is silicone oil in the described outer package shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031235018A CN1333276C (en) | 2003-05-09 | 2003-05-09 | Liquid filling shock isolation encapsulation technology for optical fibre grating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031235018A CN1333276C (en) | 2003-05-09 | 2003-05-09 | Liquid filling shock isolation encapsulation technology for optical fibre grating |
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| Publication Number | Publication Date |
|---|---|
| CN1548994A CN1548994A (en) | 2004-11-24 |
| CN1333276C true CN1333276C (en) | 2007-08-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031235018A Expired - Fee Related CN1333276C (en) | 2003-05-09 | 2003-05-09 | Liquid filling shock isolation encapsulation technology for optical fibre grating |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101009520B (en) * | 2006-12-29 | 2010-12-15 | 北京交通大学 | A novel optical fiber grating temperature compensation encapsulation method |
| CN103887688B (en) * | 2014-03-14 | 2016-06-15 | 山东省科学院激光研究所 | The encapsulating structure of distributed feedback optical fiber laser |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002019898A2 (en) * | 2000-09-07 | 2002-03-14 | Optomed As | Multi-parameter fiber optic probes |
| US6526212B1 (en) * | 2000-07-28 | 2003-02-25 | Weatherford/Lamb, Inc. | Optical fiber bulkhead feedthrough assembly and method of making same |
-
2003
- 2003-05-09 CN CNB031235018A patent/CN1333276C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6526212B1 (en) * | 2000-07-28 | 2003-02-25 | Weatherford/Lamb, Inc. | Optical fiber bulkhead feedthrough assembly and method of making same |
| WO2002019898A2 (en) * | 2000-09-07 | 2002-03-14 | Optomed As | Multi-parameter fiber optic probes |
Non-Patent Citations (3)
| Title |
|---|
| 光纤光栅封装技术 钱颖，黄石峰，柏葆华，孙英志，长春邮电学院学报，第18卷第2期 2000 * |
| 光纤布喇格光栅温度传感特性的研究 周智，武湛君，田石柱，赵雪峰，万里冰，欧进萍，压电与声光，第24卷第6期 2002 * |
| 光纤布喇格光栅温度传感特性的研究 周智，武湛君，田石柱，赵雪峰，万里冰，欧进萍，压电与声光，第24卷第6期 2002;光纤光栅封装技术 钱颖，黄石峰，柏葆华，孙英志，长春邮电学院学报，第18卷第2期 2000 * |
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| Publication number | Publication date |
|---|---|
| CN1548994A (en) | 2004-11-24 |
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