CN1145049C - A fiber grating with passive temperature compensation and its manufacturing method - Google Patents
A fiber grating with passive temperature compensation and its manufacturing method Download PDFInfo
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- CN1145049C CN1145049C CNB011244194A CN01124419A CN1145049C CN 1145049 C CN1145049 C CN 1145049C CN B011244194 A CNB011244194 A CN B011244194A CN 01124419 A CN01124419 A CN 01124419A CN 1145049 C CN1145049 C CN 1145049C
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- 239000000835 fiber Substances 0.000 title claims abstract description 73
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 19
- 229910052751 metal Inorganic materials 0.000 claims abstract description 5
- 239000002184 metal Substances 0.000 claims abstract description 5
- 229910001374 Invar Inorganic materials 0.000 claims description 31
- 229910052782 aluminium Inorganic materials 0.000 claims description 21
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 20
- 239000004411 aluminium Substances 0.000 claims description 20
- 239000003292 glue Substances 0.000 claims description 9
- 235000008331 Pinus X rigitaeda Nutrition 0.000 claims description 3
- 235000011613 Pinus brutia Nutrition 0.000 claims description 3
- 241000018646 Pinus brutia Species 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 238000013213 extrapolation Methods 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 2
- 239000013307 optical fiber Substances 0.000 abstract description 8
- 239000000463 material Substances 0.000 abstract description 6
- 239000006185 dispersion Substances 0.000 abstract description 4
- 150000001398 aluminium Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
本发明涉及一种无源温度补偿的光纤光栅及其制造方法。本发明包括至少一个光纤光栅、一热膨胀系数极小的金属支架、一热膨胀系数大的金属调整杆，其中所述支架左右各有一个支撑部分光纤光栅固定在支架上表面两端，调整杆安装在支架下部两侧板内。本发明由于采用热膨胀系数大的调整杆与热膨胀系数极小的支架相结合的结构来制造无源温度补偿的光纤光栅的方法，既可以充分保证容易获取制作器件的材料，且其制造简单易行、结构合理可靠、制作重复性好、制造的器件体积小重量轻、成本低；又可以有效保证制作的器件在无源条件下的温度补偿性能稳定可靠，能完全满足系统的功能要求，即能够完成正确的功率反射和色散补偿功能。而且支架一端固装在壳体内，另一端通过定位螺母空套于壳体内的结构，使本发明所述的无源温度补偿的光纤光栅既有一定的自由伸缩，又可减少其振动时结构的摆动幅度，进一步提高器件的可靠性。
The invention relates to a passive temperature-compensated optical fiber grating and a manufacturing method thereof. The present invention includes at least one fiber grating, a metal bracket with a very small thermal expansion coefficient, and a metal adjustment rod with a large thermal expansion coefficient, wherein each of the brackets has a supporting part on the left and right sides. Inside the two side panels of the lower part of the bracket. Because the present invention adopts the structure combining the adjustment rod with large thermal expansion coefficient and the support with extremely small thermal expansion coefficient to manufacture the method of passive temperature compensation optical fiber grating, it can fully ensure that the materials for making the device are easy to obtain, and its manufacture is simple and easy , The structure is reasonable and reliable, the production repeatability is good, the manufactured device is small in size, light in weight, and low in cost; it can also effectively ensure that the temperature compensation performance of the manufactured device under passive conditions is stable and reliable, and can fully meet the functional requirements of the system, that is, it can Complete the correct power reflection and dispersion compensation functions. Moreover, one end of the bracket is fixed in the housing, and the other end is sleeved in the housing through a positioning nut, so that the fiber grating with passive temperature compensation according to the present invention can expand and contract freely to a certain extent, and can also reduce structural stress when it vibrates. The swing amplitude further improves the reliability of the device.
Description
Technical field
The present invention relates to a kind of fiber grating, particularly a kind of fiber grating with temperature compensation.
Background technology
Fiber grating is a kind ofly by ultraviolet light the optical fiber with light sensitive characteristic directly to be exposed and form a kind of novel optical device of refractive index cycle variation in the fiber cores district.Chirp grating promptly is a kind of fiber grating wherein.
Because variation of ambient temperature, the volume and the fiber core refractive index of optical fiber change, and then cause an important parameter centre wavelength drift of chirp grating.When the centre wavelength drift value of chirp grating was big, corresponding flashlight just can not correctly be reflected and dispersion compensation.So in system, require the centre wavelength of chirp grating to keep stable as far as possible.The centre wavelength of maintenance chirp grating is stablized several different methods, such as; A, chirp grating is placed on temperature keeps in the stable environment, thus the centre wavelength of the stable control of environment temperature chirp grating promptly by the control chirp grating.B, chirp grating are a kind of positive temperature coefficient devices, and centre wavelength was elongated when promptly temperature raise, and centre wavelength shortened when temperature reduced.Utilize the special material (as pottery etc.) of negative expansion coefficient, through suitably selecting and assembling, can offset the center wavelength variation amount of chirp grating when varying with temperature, thereby keep the centre wavelength of chirp grating stable.C, select the different different materials of expansion coefficient (as metal etc.) for use, utilize special construction, through suitably assembling, thereby the center wavelength variation amount that can offset chirp grating when varying with temperature keeps the centre wavelength of chirp grating stable.D, select for use the very little special optical fiber of temperature coefficient to make chirp grating, the center wavelength variation amount of chirp grating is little when variation of ambient temperature, and system can stand.
As mentioned above, keep the stable method of the centre wavelength of chirp grating more in theory, but most methods have shortcoming, difficulty is big.Make an isoperibol of placing chirp grating, need powerful constant-temperature circuit, poor reliability, and also volume is big.The special material of negative expansion coefficient costs an arm and a leg and the present production marketing that also is not enough to satisfy the long dimensional requirement of chirp grating.Yet do not have temperature coefficient very little at present, can satisfy the report of the special optical fiber of making the stable chirp grating of centre wavelength.
Summary of the invention
At above-mentioned shortcoming, the purpose of this invention is to provide a kind of fiber grating of making reliable, volume is little, in light weight, the temperature compensation performance is good, reliability is high passive temperature compensation simple, rational in infrastructure.
Another object of the present invention provides a kind of support that thermal expansivity is minimum and big adjusting lever and the fiber grating of thermal expansivity organically combines, and makes the method for the fiber grating of reliable, the temperature compensation performance is good, reliability the is high above-mentioned passive temperature compensation of manufacturing simple, rational in infrastructure.
For achieving the above object, the present invention includes at least one fiber grating, the minimum big metallic adjusted bar of metal support, a thermal expansivity of a thermal expansivity, wherein, a support section is respectively arranged about described support, fiber grating is fixed on the rack upper surface two ends, and adjusting lever is installed in the biside plate of support bottom.
In use finish normal temperature compensation function for effectively guaranteeing fiber grating, be flat on the upper surface of support after the stretched processing of above-mentioned fiber grating and by being adhesively fixed on the support two ends, the grating effective coverage of this optical fiber is between two adhesive spots.
One section of the close both ends of above-mentioned adjusting lever to the recessed scrobicular ring that is formed with in centre, in the biside plate of above-mentioned support corresponding respectively be provided with can ccontaining adjusting lever both ends the mounting hole that cavity is big, opening is little, the mounting hole of described adjusting lever by its two ends and support biside plate is installed in the support bottom and by being adhesively fixed.For further facilitating the centre wavelength of fine setting fiber grating in manufacturing process, the centre wavelength that guarantees fiber grating is near the standard wavelength, thereby improve the yield rate of making device greatly, have certain clearance between the mounting hole of above-mentioned support and the end of adjusting lever and make both form loose fit, the value in this gap is generally 0.1mm.
Be existing certain freely the stretching of the fiber grating that makes passive temperature compensation of the present invention, the amplitude of fluctuation of structure in the time of can reducing its vibration again, improve the reliability of device, the present invention also includes shell, the left end of support that fiber grating, adjusting lever wherein are installed is by at least one cover screw---and the cooperation of nut is fixed on the shell inner cavity left end, and its right-hand member pine is enclosed within the shell inner cavity right-hand member.The amplitude of fluctuation of structure when further reducing to vibrate wherein, but screw---the nut of locating support right-hand member be provided with between the right-hand member of above-mentioned support and the shell right-hand member.
For realizing another object of the present invention, the manufacture method of fiber grating of the present invention may further comprise the steps:
A, support and adjusting lever that the Design and Machining size is suitable;
B, with fiber grating stretch a bit of after, be bonded in the rack upper surface two ends by ultraviolet glue;
C, the fiber grating that is bonded on the support after will stretching carry out burin-in process, and the centre wavelength of guaranteeing fiber grating is near the standard wavelength;
D, the adjusting lever two ends are installed in the mounting hole of support biside plate;
E, utilize in the gap between adjusting lever and the support mounting hole press or extrapolation support and the centre wavelength of finely tuning fiber grating to the standard wavelength;
F, ultraviolet glue is coated in the gap location of support and adjusting lever, the curing by ultraviolet glue is fixed on the support two ends with adjusting lever.
The present invention is owing to adopting the minimum support structure combining of big adjusting lever of thermal expansivity and thermal expansivity to make the method for the fiber grating of passive temperature compensation, both can fully guarantee to obtain easily the material of making device, and the device volume of its manufacturings reliable, making good reproducibility simple, rational in infrastructure, manufacturing little in light weight, cost is low; Can guarantee effectively that again the temperature compensation of device under passive condition of making is stable and reliable for performance, can satisfy the functional requirement of system fully, promptly can finish correct power reflection and chromatic dispersion compensating function.And support one end is packed in the housing, the other end is placed in structure in the housing by setscrew nut, make existing certain freely the stretching of fiber grating of passive temperature compensation of the present invention, can reduce the amplitude of fluctuation of its structure again in when vibration, further improve the reliability of device.
Description of drawings
Describe basic composition of the present invention and principle of work in detail below in conjunction with accompanying drawing:
Fig. 1 is that structure of the present invention is formed synoptic diagram;
Fig. 2 is the structural representation of aluminium adjusting lever of the present invention;
Fig. 3 is the structural representation of invar support of the present invention;
Embodiment
As Fig. 1～shown in Figure 3, the present invention includes at least one fiber grating 1, the support 2 that one thermal expansivity is minimum, the adjusting lever 3 that one thermal expansivity is big, wherein in the present embodiment, fiber grating 1 refers specifically to chirp grating, be subjected to the influence of variation of ambient temperature, the common influence that expand with heat and contract with cold and the fiber core refractive index of this chirp grating change makes the centre wavelength of chirp grating change, its rate of change is about 10pm/ ℃, and what play a major role in this process is the influence of the refractive index of chirp grating, select for use the invar material that obtains easily with processing and fabricating to make support 2 simultaneously, the thermal expansivity of this invar support 2 is about 1.5*10
-6/ ℃, because of its thermal expansivity less relatively, thereby can not consider its deformation influence in temperature changing process in the total system, we select for use to obtain easily with the aluminum profile extrusion of processing and fabricating and make adjusting lever 3 accordingly, and the thermal expansivity of this aluminium adjusting lever 3 is about 2.3*10
-5/ ℃, wherein fiber grating 1 is fixed on support 2 upper surface two ends, and the upper surface of support 2 is the high right low stepped appearance distribution in a left side simultaneously.For avoiding fiber grating 1 directly to contact with support 2 upper surfaces, the sticky bit place of the corresponding fiber grating 1 of above-mentioned invar support 2 upper surfaces is provided with the convex 23 that raises up slightly respectively simultaneously, and the both ends of fiber grating 1 are bonded on this convex 23 by ultraviolet glue.Aluminium adjusting lever 3 is installed in the support 2 bottom biside plates.Wherein aluminium adjusting lever 3 is varied with the syndeton of invar support 2, in the present embodiment, one section of the close both ends of above-mentioned adjusting lever to the recessed scrobicular ring 31 that is formed with in centre, in the biside plate of above-mentioned invar support 2 corresponding respectively be provided with can ccontaining adjusting lever 3 both ends the mounting hole that cavity is big, opening is little 24, the cooperating of the mounting hole 24 of described aluminium adjusting lever 3 by its two ends and invar support 2 biside plates be installed in support 2 bottoms and by being adhesively fixed.For further facilitating the centre wavelength of fine-tuning fiber grating 1 in manufacturing process, the centre wavelength that guarantees fiber grating 1 is near the standard wavelength, thereby improve the yield rate of element manufacturing greatly, having certain clearance between the mounting hole 24 of above-mentioned invar support 2 and the both ends of adjusting lever 3 makes both form loose fit before bonding, the centre wavelength that can regulate fiber grating 1 by the interior pressure or the invar support 2 of extrapolating when making aluminium adjusting lever 3 device invar support 2 mounting holes 24 in, the value in this gap is generally 0.1mm.Wherein for making existing certain freely the stretching of fiber grating of passive temperature compensation of the present invention, the amplitude of fluctuation of structure in the time of can reducing its vibration again, improve the reliability of device, the present invention also includes shell 4, the left end of invar support 2 that fiber grating 1, aluminium adjusting lever 3 wherein are installed is by at least one cover screw---and the cooperation of nut 21 is fixed on shell 4 inner chamber left ends, in the present embodiment, screw---the cooperation of nut 21 is fixed in the shell 4 left end of invar support 2 by two covers, and its right-hand member pine is enclosed within shell 4 inner chamber right-hand members.Wherein be the amplitude of fluctuation of structure when further reducing its vibration, improve the reliability of device, be provided with the screw that to locate invar support 2 right-hand members---nut between the right-hand member of above-mentioned invar support 2 and shell 4 right-hand members.
Basic functional principle of the present invention is: when variation of ambient temperature, the common influence that expand with heat and contract with cold and the fiber core refractive index of chirp grating (chirp grating is the fiber grating 1 of indication in the present embodiment) change makes the centre wavelength of chirp grating change, this moment is because the deformation of invar support 2 itself is very little, can ignore and not consider, the deformation of aluminium adjusting lever 3 is bigger, the deformation of aluminium adjusting lever 3 causes that deformation takes place invar support 2, and then thereby the distance between two adhesive spots on the change invar support 2 changes the length of chirp grating, and the variation of the length of chirp grating cause the centre wavelength of chirp grating take place with because of the opposite variation of the variation of the caused centre wavelength of temperature variation, when the invar support 2 of selecting suitable dimension for use and 3 combinations of aluminium adjusting lever, both are mutually offsetted by caused variable quantity, and then the centre wavelength that guarantees chirp grating is relatively stable, realize passive temperature compensation, make chirp grating can finish correct power reflection and chromatic dispersion compensating function.
For realizing another object of the present invention, optical fiber manufacturing method of the present invention may further comprise the steps:
A, according to the rate of temperature change of selected chirp grating, invar support 2 that the Design and Machining size is suitable and aluminium adjusting lever 3; It wherein mainly is the size that length (effective length of chirp grating is generally about 10cm in the fiber grating) according to fiber grating 1 (chirp grating) is selected suitable adjusting lever 3 (adjusting lever 3 adopts the aluminium adjusting levers in the present embodiment), the total length of aluminium adjusting lever 3 is 120mm in the present embodiment method, and the size of selecting suitable support 2 (adopting the invar support in the present embodiment), in the present embodiment, distance between the biside plate of invar support 2 is 110mm, the low bit length of the right section of invar support 2 is 50mm, distance between two convexes 23 is 120mm, convex 23 length own are 10mm, convex 23 thickness own are 0.63mm, choose the size that can choose package casing 4 after the size of invar support 2 and aluminium adjusting lever 3 accordingly like this, in the present embodiment, the length of shell 4 is 158mm, respectively is provided with the long erecting bed of a 8mm simultaneously outside shell 4 two ends.
B, with fiber grating 1 stretch a bit of after, in this implementation method, the length that fiber grating 1 is stretched is about 0.8nm, the fiber grating 1 after will stretching again is bonded in support 3 upper surface two ends.
C, the fiber grating 1 that is bonded on the support 2 after will stretching carry out burin-in process, and the centre wavelength of guaranteeing fiber grating 1 under the normal temperature is near the standard wavelength;
D, aluminium adjusting lever 3 two ends are installed in the mounting hole 24 of support 2 biside plates;
E, utilize in the gap between aluminium adjusting lever 3 and invar support 2 mounting holes 24 press or the centre wavelength of extrapolation invar support 2 and fine setting fiber grating 1 to the standard wavelength;
F, ultraviolet glue is coated in the gap location of invar support 2 and aluminium adjusting lever 3, the curing by ultraviolet glue is fixed on support 2 two ends with aluminium adjusting lever 3.
For the fiber grating that further makes passive temperature compensation of the present invention both can effectively guarantee it certain freely stretching arranged, the amplitude of fluctuation in the time of can reducing its vibration again, the reliability of raising device, manufacture method of the present invention is further comprising the steps of:
G, the left end of invar support 2---cooperation of nut 21 (wherein this implementation method is the to utilize two cover screws---cooperation of nut that will be equipped with fiber grating 1, aluminium adjusting lever 3 by at least one cover set screw) invar support 2 left ends are fixed on shell 4 inner chamber left ends; Then
H, invar support 2 right-hand members are placed in shell 4 inner chamber right-hand members, and set screw---the cooperation of nut 22 is positioned at shell 4 inner chamber right-hand members with invar support 2 right-hand members by a cover.Like this by increase by location screw a---nut 22 at unsettled structure end, both guaranteed passive temperature compensation of the present invention fiber grating freely stretch the amplitude of fluctuation when effectively reducing its vibration again, the reliability of raising device.
Claims (10)
1, the fiber grating of passive temperature compensation, it is characterized in that comprising at least one fiber grating (1), the minimum big metallic adjusted bar (3) of metal support (2), a thermal expansivity of a thermal expansivity, wherein, a support section is respectively arranged about described support, fiber grating (1) is fixed on support (2) upper surface two ends, and adjusting lever (3) is installed in the biside plate of support (2) bottom.
2, according to the fiber grating of the described passive temperature compensation of claim 1, it is characterized in that being flat on the upper surface of support (2) after the stretched processing of above-mentioned fiber grating (1) and by being adhesively fixed on support (2) two ends, the effective coverage of this fiber grating (1) is between two adhesive spots.
3, according to the fiber grating of the described passive temperature compensation of claim 2, the upper surface that it is characterized in that above-mentioned support (2) is the high right low stepped appearance distribution in a left side, and the sticky bit of the corresponding fiber gratings in its both ends (1) is respectively equipped with the convex (23) that raises up slightly.
4, according to the fiber grating of the described passive temperature compensation of claim 1, one section that it is characterized in that the close both ends of above-mentioned adjusting lever (3) to the recessed scrobicular ring (31) that is formed with in centre, in the biside plate of above-mentioned support (2) respectively correspondence be provided with can ccontaining adjusting lever (3) both ends the mounting hole that cavity is big, opening is little (24), the mounting hole (24) of described adjusting lever (3) by its two ends and support (2) biside plate is installed in support (2) bottom and by being adhesively fixed.
5, according to the fiber grating of the described passive temperature compensation of claim 4, it is characterized in that having certain clearance between the end of the mounting hole (24) of above-mentioned support (2) and adjusting lever (3), made both form loose fit before bonding, the value in this gap is generally 0.1mm.
6, according to the fiber grating of the described passive temperature compensation of claim 1, it is characterized in that above-mentioned support (2) adopts invar to be processed into, above-mentioned adjusting lever (3) adopts aluminium to be processed into.
7, according to the fiber grating of claim 1 or 2 or 3 or 4 or 5 or 6 described passive temperature compensations, it is characterized in that also including shell (4), the left end of support (2) that fiber grating (1), adjusting lever (3) wherein are installed is by at least one cover screw---and the cooperation of nut (21) is fixed on shell (4) inner chamber left end, and its right-hand member pine is enclosed within shell (4) inner chamber right-hand member.
8, according to the fiber grating of the described passive temperature compensation of claim 7, it is characterized in that the right-hand member of above-mentioned support (2) and shell (4) but be provided with screw---the nut (22) of locating support (2) right-hand member between the right-hand member.
9, a kind of method of making the fiber grating of the described passive temperature compensation of one of above-mentioned arbitrary claim is characterized in that described manufacture method may further comprise the steps:
A, support (2) and adjusting lever (3) that the Design and Machining size is suitable;
B, with fiber grating (1) stretch a bit of after, be bonded in support (2) upper surface two ends by ultraviolet glue;
C, the fiber grating (1) that is bonded on the support (2) after will stretching carry out burin-in process, and the centre wavelength of guaranteeing fiber grating (1) is near the standard wavelength;
D, the adjusting lever two ends are installed in the mounting hole (24) of support (2) biside plate;
E, utilize in the gap between adjusting lever (3) and support (2) mounting hole (24) press or the centre wavelength of extrapolation support (2) and fine setting fiber grating (1) to the standard wavelength;
F, ultraviolet glue is coated in the gap location of support (2) and adjusting lever (3), the curing by ultraviolet glue is fixed on support (2) two ends with adjusting lever (3).
10, manufacture method according to claim 9 is characterized in that further comprising the steps of:
G, will be equipped with fiber grating (1), adjusting lever (3) the left end of support (2) by at least one cover set screw---the cooperation of nut (21) is fixed on shell (4) inner chamber left end; Then
H, support (2) right-hand member is placed in shell (4) inner chamber right-hand member and overlaps by one that set screw---the cooperation of nut (22) is positioned at shell (4) inner chamber right-hand member with support (2) right-hand member.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB011244194A CN1145049C (en) | 2001-07-25 | 2001-07-25 | A fiber grating with passive temperature compensation and its manufacturing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011244194A CN1145049C (en) | 2001-07-25 | 2001-07-25 | A fiber grating with passive temperature compensation and its manufacturing method |
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| CN1399152A CN1399152A (en) | 2003-02-26 |
| CN1145049C true CN1145049C (en) | 2004-04-07 |
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| CNB011244194A Expired - Fee Related CN1145049C (en) | 2001-07-25 | 2001-07-25 | A fiber grating with passive temperature compensation and its manufacturing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2793155C1 (en) * | 2022-11-28 | 2023-03-29 | федеральное государственное автономное образовательное учреждение высшего образования "Национальный исследовательский университет ИТМО" (Университет ИТМО) | Method for passive compensation of the temperature dependence of the optical parameters of a fibre bragg grating |
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| DK1709416T3 (en) * | 2004-01-23 | 2018-06-18 | Lm Wind Power Int Tech Ii Aps | Device comprising a system adapted for use in temperature compensation for load measurements in fiber-reinforced structures |
| CN101019053B (en) * | 2004-05-05 | 2011-09-28 | 尼奥弗托尼克斯公司 | Athermal AWG and AWG with low power consumption using groove of changeable width |
| CN100554901C (en) * | 2008-05-05 | 2009-10-28 | 中国地震局地壳应力研究所 | Work in the method for making of the high-sensitivity optical fibre grating temperature sensor of high and low temperature |
| CN101800607B (en) * | 2010-01-12 | 2013-04-17 | 浙江大学 | High-order dynamic adjustable dispersion compensation equipment and dispersion compensation method thereof |
| CN102539874A (en) * | 2012-01-18 | 2012-07-04 | 哈尔滨理工大学 | Fiber bragg grating current transformer with automatic temperature tracking function and automatic temperature tracking method |
| CN107128332A (en) * | 2017-07-03 | 2017-09-05 | 翟晓晨 | Railroad track grating core carbon fiber sensor |
| CN109579710A (en) * | 2018-12-26 | 2019-04-05 | 中国航空工业集团公司北京航空精密机械研究所 | A kind of flexible grating installing mechanism with thermal stability |
| CN110221095A (en) * | 2019-07-03 | 2019-09-10 | 蚌埠学院 | A kind of three-stage fiber grating accelerometer based on cross force |
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2001
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2793155C1 (en) * | 2022-11-28 | 2023-03-29 | федеральное государственное автономное образовательное учреждение высшего образования "Национальный исследовательский университет ИТМО" (Университет ИТМО) | Method for passive compensation of the temperature dependence of the optical parameters of a fibre bragg grating |
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Addressee: Huawei Technologies Co., Ltd. Document name: Notification of Termination of Patent Right |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20040407 Termination date: 20170725 |