CN1381737A - Temp compensator of light waveguide raster - Google Patents
Temp compensator of light waveguide raster Download PDFInfo
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- CN1381737A CN1381737A CN 02111981 CN02111981A CN1381737A CN 1381737 A CN1381737 A CN 1381737A CN 02111981 CN02111981 CN 02111981 CN 02111981 A CN02111981 A CN 02111981A CN 1381737 A CN1381737 A CN 1381737A
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- Prior art keywords
- light waveguide
- waveguide raster
- compensating part
- raster
- temperature compensation
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Abstract
A temp. compensator of light waveguide raster features that the light waveguide raster and the compensating element which may be a regulating screw with high positive temp. expansibility are respectively fixed to two mutually hinged supports by welding or adhesive. Its advantages are simple structure, convenient regulation and high effect.
Description
Technical field
The invention belongs to the light waveguide raster technical field, relates to the temperature compensation means of light waveguide raster.
Background technology
Contain the irradiation of the optical waveguide of photoactive substance by ultraviolet light, its fiber waveguide refractive index will change, and utilize this effect, and the sandwich layer of optical waveguide is carried out periodic uv-exposure, thereby form light waveguide raster.Fiber grating is most important a kind of in numerous light waveguide rasters, is the full fiber type filtering device, has many outstanding advantages, is widely used in various fields such as optical fiber communication, Fibre Optical Sensor.The invention is that example describes with the fiber grating, and other light waveguide rasters and it are similar.Because fiber grating is very unfavorable as some fiber optic telecommunications equipment and stress sensing device for fiber grating like this along with its centre wavelength of temperature variation can be drifted about.Except temperature can change the centre wavelength of fiber grating, the strain/stress that is applied in the fiber grating by change also can change its centre wavelength.This by coupled mode theory as can be known, the foveal reflex wavelength of Fiber Bragg Grating is
λ
B=2n
EffΛ is n wherein
EffBe the effective refractive index of transmission mode, Λ is the cycle of grating.When temperature raises, the effective refractive index n of transmission mode
EffCan increase thereupon, cause centre wavelength to be drifted about to long wavelength's direction; Otherwise centre wavelength is drifted about to short wavelength's direction.For centre wavelength is not drifted about, we can compensate the centre wavelength drift that is caused by temperature by the periods lambda that changes grating.The change in grating cycle can realize by the stress that change is applied on the fiber grating.Cancel out each other in order to arrive two kinds of effects that change generation, Chinese patent 99812980.1 proposes fiber grating is fixed on the material with certain negative temperature expansion coefficient.Utilize material when temperature raises, to reduce Optical fiber component stress, increase Optical fiber component stress when temperature reduces, to realize causing the compensation of wave length shift owing to temperature variation.But it depends on the selection of specified temp expansion coefficient material, is-9.46 * 10 by calculating as can be known the negative temperature expansion coefficient that compensates material requested for certain fiber grating
-6The preparation of this material is difficulty quite, and when if desired another fiber grating being compensated, because the change of fiber grating characteristic, the negative temperature expansion coefficient of selected compensative material is done some adjustment again, otherwise can not realize effective compensation, therefore more increase the difficulty in the material preparation.And in the fiber grating fixation procedure, need to apply certain prestress, and just can reach the purpose of regulating centre wavelength and temperature compensation range, it is bigger to implement difficulty.
Summary of the invention
The present invention is the temperature compensation means that a kind of light waveguide raster will be provided, it needn't rely on the material with specified temp expansion coefficient, simple in structure, can apply prestress to light waveguide raster easily, reach the purpose of regulating centre wavelength and temperature compensation range.
In order to achieve the above object, basic technical scheme is: adopt two supports that are hinged, light waveguide raster and compensating part are separately fixed on two supports.
The beneficial effect of the invention:
(1) simple in structure, by two hinged supports, utilize lever principle, by regulating light waveguide raster and compensating part relative position with respect to hinge between two supports, the length variations that compensating part can be varied with temperature generation is applied on the light waveguide raster according to the adjusting ratio, thereby the stress/strain of corresponding change light waveguide raster is to compensate the wave length shift that light waveguide raster varies with temperature generation;
(2) this device needn't rely on a certain specific temperature expansion coefficient material, only two supports and compensating part need be chosen as two kinds of temperature expansion co-efficient difference not bigger material get final product, thereby the device usable range is wide, can carry out temperature compensation to various light waveguide rasters;
(3) this device is fit to line of material swelling properties hot in nature fully, can have good effect temperature compensation to fiber grating in whole range of temperature;
(4) this device can not cause the generation of chirp phenomenon because the stress of light waveguide raster is applied to the two ends of grating region.
Description of drawings
Fig. 1 is the structural representation of technical scheme embodiment 1;
Fig. 2 is the structural representation of technical scheme embodiment 2;
Embodiment:
Embodiment with reference to the invention of accompanying drawing detailed explanation.
Example 1: as shown in Figure 1, support 4 and support 5 connect into the scissors-type structure by hinge 6.The grating position 3 of optical fiber 1 is fixed between support 4 and 5 by convered structure 2, and convered structure 2 is got stickums such as scolder or epoxy resin.Compensating part 8 fixtures 7 are rack-mount, and fiber grating 3 and compensating part 8 are fixedly mounted on the both sides of hinge 6 respectively.Only need to select the bigger material of positive temperature expansion coefficient to make compensating part 8, its material is different with timbering material, regulate fiber grating 3 and compensating part 8 position with respect to hinge 6, be the ratio of spacing 9 and spacing 10, the drift value of the centre wavelength that just can the full remuneration fiber grating causes because of temperature variation.Compensating part 8 can be made into the shape of adjusting screw, is installed by fixture nut 7 to be connected on the support, regulates compensating part 8 and applies prestress to fiber grating, makes centre wavelength reach required value, and last encapsulation is finished in the position of fixed compensation spare 8 then.So as can be seen structure make fiber grating adjusting, the encapsulation more easy.
Example 2: as shown in Figure 2, different with example 1 is same one side that fiber grating 3 and compensating part 8 are fixedly mounted on hinge 6, in this embodiment, compensating part 8 must be made by the material of negative temperature expansion coefficient, equally, by the ratio of spacing 9 and spacing 10, the compensating part 8 that can adopt less negative temperature expansion coefficient material to make also can be realized the purpose of temperature compensation.
Claims (5)
1. the temperature compensation means of light waveguide raster is characterized in that the support that has two to be hinged light waveguide raster and compensating part being separately fixed on two supports.
2. by the temperature compensation means of the described light waveguide raster of claim 1, it is characterized in that support (4) and support (5) are interconnected to the scissors-type structure by hinge (6); Light waveguide raster (3) is fixed between support (4) and (5) by convered structure (2), and compensating part (8) fixture (7) is rack-mount; Light waveguide raster (3) and compensating part (8) are fixedly mounted on the both sides of hinge (6) respectively.
3. by the temperature compensation means of the described light waveguide raster of claim 2, it is characterized in that the material of convered structure (2) is got stickums such as scolder or epoxy resin; The material of compensating part (8) is the material of positive temperature expansion coefficient.
4. by the temperature compensation means of the described light waveguide raster of claim 2, it is characterized in that compensating part (8) is adjusting screw shape, compensating part (8) installation is connected on the support by fixture nut (7).
5. by the temperature compensation means of the described light waveguide raster of claim 1, it is characterized in that light waveguide raster (3) and compensating part (8) are fixedly mounted on same one side of hinge (6); Compensating part (8) is made by negative temperature expansion coefficient materials with smaller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02111981 CN1381737A (en) | 2002-06-05 | 2002-06-05 | Temp compensator of light waveguide raster |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02111981 CN1381737A (en) | 2002-06-05 | 2002-06-05 | Temp compensator of light waveguide raster |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1381737A true CN1381737A (en) | 2002-11-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02111981 Pending CN1381737A (en) | 2002-06-05 | 2002-06-05 | Temp compensator of light waveguide raster |
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| CN (1) | CN1381737A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102636288A (en) * | 2012-04-06 | 2012-08-15 | 南昌航空大学 | Triangular encapsulation method of fiber grating sensor |
| CN104027108A (en) * | 2014-06-19 | 2014-09-10 | 天津大学 | Novel optical electrocardio and pulse comprehensive detection device |
| CN112268939A (en) * | 2020-10-27 | 2021-01-26 | 东南大学 | Humidity sensor based on mechanical metamaterial structure |
-
2002
- 2002-06-05 CN CN 02111981 patent/CN1381737A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102636288A (en) * | 2012-04-06 | 2012-08-15 | 南昌航空大学 | Triangular encapsulation method of fiber grating sensor |
| CN102636288B (en) * | 2012-04-06 | 2013-10-02 | 南昌航空大学 | Triangular encapsulation method of fiber grating sensor |
| CN104027108A (en) * | 2014-06-19 | 2014-09-10 | 天津大学 | Novel optical electrocardio and pulse comprehensive detection device |
| CN104027108B (en) * | 2014-06-19 | 2016-06-29 | 天津大学 | A kind of optics electrocardio, pulse comprehensive detection device |
| CN112268939A (en) * | 2020-10-27 | 2021-01-26 | 东南大学 | Humidity sensor based on mechanical metamaterial structure |
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