CN210774420U - Optical fiber grating temperature sensor without glue encapsulation - Google Patents
Optical fiber grating temperature sensor without glue encapsulation Download PDFInfo
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- CN210774420U CN210774420U CN201922121142.4U CN201922121142U CN210774420U CN 210774420 U CN210774420 U CN 210774420U CN 201922121142 U CN201922121142 U CN 201922121142U CN 210774420 U CN210774420 U CN 210774420U
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- temperature sensor
- sheet substrate
- optical fiber
- fiber grating
- grating temperature
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Abstract
The utility model discloses a fiber grating temperature sensor of no encapsulation, include: an elongated sheet substrate, and optical fibers disposed along a length of the sheet substrate. The top of the sheet substrate is provided with a containing groove and two welding grooves along the length direction, and the two welding grooves are arranged at the two ends of the containing groove. The welding grooves are internally provided with prefabricated glass solders, optical fibers penetrate into the accommodating grooves from one ends of the sheet substrates, penetrate out from the other ends of the sheet substrates after sequentially penetrating through the glass solders in the two welding grooves along the accommodating grooves, and Bragg gratings are arranged on the portions, located between the two welding grooves, of the optical fibers. The beneficial effects of the utility model reside in that: simple structure and convenient packaging. The glass solder is adopted for glue-free packaging, and the optical fiber grating temperature sensor is not easy to age and fall off, so that the measurement precision of the optical fiber grating temperature sensor is higher, the stability is better, and the service life is longer. The glass solder and the optical fiber material are both composed of silicon dioxide, and the parameters such as thermal expansion coefficient, rigidity and the like are similar, so that the linearity of optical fiber deformation can be effectively ensured.
Description
Technical Field
The utility model relates to a technical field of sensor encapsulation, in particular to fiber grating temperature sensor of no encapsulation of gluing.
Background
Glue such as ultraviolet glue, 353ND, epoxy is adopted mostly to encapsulate during current fiber grating temperature sensor encapsulation, and this kind of packaging structure is along with the increase of light and heat and time, all can take place performance changes such as ageing in the encapsulation junction, can appear the phenomenon that glue drops even for fiber grating temperature sensor's measurement accuracy is low, poor stability to and life is short. In addition, most of installation parts on the substrate of the existing fiber grating temperature sensor are symmetrically arranged about the Bragg grating axis, the installation parts and the substrate are connected into a whole in the same thickness, when the fiber grating temperature sensor with the installation structure is installed, the pretightening force of the bolt can generate transverse and axial stress deformation on the Bragg grating, and the measurement accuracy of the fiber grating temperature sensor is reduced.
SUMMERY OF THE UTILITY MODEL
The problem to prior art exists, the utility model aims at providing a fiber grating temperature sensor of no encapsulation of gluing, aim at solving current fiber grating temperature sensor and adopt the glue encapsulation, glue is ageing and drop easily, and the measurement accuracy that leads to fiber grating temperature sensor is low, poor stability, and life is short to and current fiber grating temperature sensor is when installing, and the pretightning force of bolt can produce the problem of horizontal and axial stress deformation to Bragg grating.
In order to achieve the above object, the utility model provides a fiber grating temperature sensor of no encapsulation of gluing, include: an elongated sheet substrate, and optical fibers disposed along a length of the sheet substrate. The top of the sheet substrate is provided with a containing groove and two welding grooves along the length direction, and the two welding grooves are arranged at the two ends of the containing groove. The welding grooves are internally provided with prefabricated glass solders, optical fibers penetrate into the accommodating grooves from one ends of the sheet substrates, penetrate out from the other ends of the sheet substrates after sequentially penetrating through the glass solders in the two welding grooves along the accommodating grooves, and Bragg gratings are arranged on the portions, located between the two welding grooves, of the optical fibers. The two sides of the sheet substrate along the length direction are provided with installation parts which are symmetrically arranged at the positions opposite to the Bragg gratings, and the installation parts are provided with threaded installation holes. The installation part is provided with a connecting part, the installation part is connected with the thin sheet substrate through the connecting part, the two connecting parts are centrosymmetric about the geometric center of the Bragg grating, and the thickness of the connecting part is far smaller than that of the installation part.
Preferably, the foil substrate is a stainless steel foil.
Preferably, the welding groove is cylindrical, the depth of the welding groove is the same as the groove depth of the accommodating groove, and the diameter of the welding groove is larger than the groove width of the accommodating groove.
Preferably, the glass solder is cylindrical, the height of the glass solder is consistent with that of the welding groove, the diameter of the glass solder is consistent with that of the welding groove, a through hole is formed in the side wall of the glass solder along the diameter direction of the glass solder, and the length direction of the through hole is consistent with that of the accommodating groove.
Compared with the prior art, the beneficial effects of the utility model reside in that: overall structure is simple, adopts prefabricated glass solder to carry out the pre-installation, carries out glueless welding encapsulation again for the pre-installation is convenient, and the junction after the encapsulation is difficult for ageing and droing, makes fiber grating temperature sensor measurement accuracy higher, and stability is better, and life is longer. The glass solder and the optical fiber material are both composed of silicon dioxide, and the parameters such as thermal expansion coefficient, rigidity and the like are similar, so that the linearity of optical fiber deformation can be effectively ensured. The installation part is connected with the thin sheet substrate by adopting the connecting parts which are symmetrical about the center of the Bragg grating, so that the transverse and axial stress deformation of the Bragg grating caused by the pretightening force of the bolt in the installation process can be greatly reduced. The thickness of connecting portion is far less than the thickness of installation department, and connecting portion receive external force deformability strong in the installation, and bolt pretightning force that can significantly reduce transmits to the thin slice basement.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of the non-glue packaged fiber grating temperature sensor of the present invention;
FIG. 2 is a schematic diagram of a glass solder preform according to an embodiment of the present invention;
the purpose of the present invention is to provide a novel and improved method and apparatus for operating a computer.
Detailed Description
The utility model provides a fiber grating temperature sensor of no encapsulation of gluing.
Referring to fig. 1-2, fig. 1 is a schematic structural diagram of an embodiment of the non-glue packaged fiber grating temperature sensor of the present invention, and fig. 2 is a structural diagram of a prefabricated glass solder in an embodiment of the present invention.
As shown in fig. 1-2, in the embodiment of the present invention, the fiber grating temperature sensor without glue package includes: a strip-shaped sheet substrate 100, and optical fibers 200 arranged along the length direction of the sheet substrate 100.
The top of the sheet base 100 is provided with a receiving groove 300 and two welding grooves 400 along the length direction thereof, and the two welding grooves 400 are disposed at both ends of the receiving groove 300.
The welding groove 400 is cylindrical, has the same depth as the receiving groove 300, and has a diameter greater than the width of the receiving groove 300.
The prefabricated glass solder 500 is arranged in the welding groove 400, the prefabricated glass solder 500 is cylindrical, the height of the prefabricated glass solder 500 is consistent with that of the welding groove 400, the diameter of the prefabricated glass solder is consistent with that of the welding groove 400, the prefabricated glass solder 500 can be directly clamped into the welding groove 400 during preassembly, and preassembly is convenient. The side wall of the glass solder 500 is provided with a through hole 510 along the diameter direction thereof, so that the length direction of the through hole 510 is ensured to be consistent with that of the accommodating groove 300 when pre-assembling.
During preassembly, the optical fiber 200 is inserted into the accommodating groove 300 from one end of the sheet substrate 100, sequentially passes through the glass solders 500 in the two solder grooves 400 through the through holes 510 on the glass solders 500 along the accommodating groove 300, and then passes out from the other end of the sheet substrate 100, and the bragg grating 210 is disposed on the portion of the optical fiber 200 between the two solder grooves 400.
During packaging, the glass solder 500 of the pre-assembled fiber grating temperature sensor is soldered by high-frequency induction heating, resistance heating or laser heating, so that the glass solder 500 is melted and is connected with the optical fiber 200 and the sheet substrate 100 after being cooled.
Preferably, in the present embodiment, in order to ensure that the sheet substrate 100 has a certain protection strength for the optical fiber 200, the sheet substrate 100 is made of stainless steel.
The sheet substrate 100 is further provided with mounting portions 110 on both sides in the longitudinal direction thereof, the mounting portions 110 are symmetrically disposed at positions opposite to the bragg gratings 210, and the mounting portions 110 are provided with screw mounting holes 111. The mounting portion is provided with a connecting portion 112, the mounting portion 110 is connected to the sheet substrate 100 through the connecting portion 112, the two connecting portions 112 are centrosymmetric with respect to the geometric center of the bragg grating 210, and the thickness of the connecting portion 112 is much smaller than that of the mounting portion 110. When the optical fiber grating temperature sensor is installed, the optical fiber grating temperature sensor 200 without the glue package is installed in the environment with the measured temperature through the matching of the bolt and the threaded installation hole 111.
Compared with the prior art, the beneficial effects of the utility model reside in that: overall structure is simple, adopts prefabricated glass solder 500 to carry out the pre-installation after, carries out glueless welding encapsulation again for the pre-installation is convenient, and the junction after the encapsulation is difficult for ageing and droing, makes this fiber grating temperature sensor measurement accuracy higher, and stability is better, and life is longer. The glass solder 500 and the optical fiber 200 are made of silicon dioxide, and the parameters such as thermal expansion coefficient, rigidity and the like are similar, so that the linearity of the deformation of the optical fiber 200 can be effectively ensured. The connecting portions 112 that are symmetric with respect to the center of the bragg grating 210 are used to connect the mounting portion 110 and the sheet substrate 100, so that the transverse and axial stress deformation of the bragg grating 210 caused by the pre-tightening force of the bolts in the mounting process can be greatly reduced. The thickness of the connecting portion 112 is much smaller than that of the mounting portion 110, and the connecting portion 112 is highly deformable by external force during mounting, so that the transmission of bolt pretightening force to the sheet substrate 100 can be greatly reduced.
The above is only the preferred embodiment of the present invention, not so limiting the patent scope of the present invention, all of which are in the utility model discloses a conceive, utilize the equivalent structure transform that the content of the specification and the attached drawings did, or directly/indirectly use all to include in other relevant technical fields the patent protection scope of the present invention.
Claims (4)
1. A fiber grating temperature sensor without glue encapsulation, comprising: the optical fiber sensor comprises a strip-shaped sheet substrate and optical fibers arranged along the length direction of the sheet substrate; the top of the sheet substrate is provided with a containing groove and two welding grooves along the length direction of the sheet substrate, and the two welding grooves are arranged at the two ends of the containing groove; the welding grooves are internally provided with prefabricated glass solders, the optical fiber penetrates into the accommodating groove from one end of the sheet substrate, penetrates through the glass solders in the two welding grooves along the accommodating groove in sequence and then penetrates out from the other end of the sheet substrate, and the part of the optical fiber between the two welding grooves is provided with a Bragg grating; the two sides of the sheet substrate along the length direction are provided with installation parts, the installation parts are symmetrically arranged at the positions opposite to the Bragg gratings, and the installation parts are provided with threaded installation holes; be equipped with connecting portion on the installation department, the installation department passes through connecting portion with the thin slice basement is connected, two connecting portion are about the geometric centre of Bragg grating is central symmetry, just the thickness of connecting portion is far less than the thickness of installation department.
2. The cement-free encapsulated fiber grating temperature sensor of claim 1, wherein the foil substrate is a stainless steel foil.
3. The binderless package fiber grating temperature sensor of claim 1 wherein the solder pot is cylindrical and has a depth equal to the depth of the receiving cavity and a diameter greater than the width of the receiving cavity.
4. The binderless package fiber grating temperature sensor of claim 3 wherein the glass solder has a cylindrical shape with a height corresponding to the height of the solder pot and a diameter corresponding to the diameter of the solder pot; through holes are formed in the side wall of the glass solder along the diameter direction of the side wall, and the length directions of the through holes and the accommodating groove are consistent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922121142.4U CN210774420U (en) | 2019-11-29 | 2019-11-29 | Optical fiber grating temperature sensor without glue encapsulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922121142.4U CN210774420U (en) | 2019-11-29 | 2019-11-29 | Optical fiber grating temperature sensor without glue encapsulation |
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| Publication Number | Publication Date |
|---|---|
| CN210774420U true CN210774420U (en) | 2020-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922121142.4U Active CN210774420U (en) | 2019-11-29 | 2019-11-29 | Optical fiber grating temperature sensor without glue encapsulation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112629696A (en) * | 2020-12-04 | 2021-04-09 | 长飞光纤光缆股份有限公司 | High-temperature quick-response fiber grating temperature sensor and preparation method thereof |
| CN114923430A (en) * | 2022-04-19 | 2022-08-19 | 大连理工大学 | Non-glue fiber grating strain sensor |
-
2019
- 2019-11-29 CN CN201922121142.4U patent/CN210774420U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112629696A (en) * | 2020-12-04 | 2021-04-09 | 长飞光纤光缆股份有限公司 | High-temperature quick-response fiber grating temperature sensor and preparation method thereof |
| CN114923430A (en) * | 2022-04-19 | 2022-08-19 | 大连理工大学 | Non-glue fiber grating strain sensor |
| CN114923430B (en) * | 2022-04-19 | 2023-05-26 | 大连理工大学 | Non-gel fiber grating strain sensor |
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