CN219161498U - High-sensitivity fiber bragg grating temperature sensor - Google Patents
High-sensitivity fiber bragg grating temperature sensor Download PDFInfo
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- CN219161498U CN219161498U CN202320292899.3U CN202320292899U CN219161498U CN 219161498 U CN219161498 U CN 219161498U CN 202320292899 U CN202320292899 U CN 202320292899U CN 219161498 U CN219161498 U CN 219161498U
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Abstract
The utility model discloses a high-sensitivity fiber bragg grating temperature sensor in the technical field of fiber bragg gratings, which comprises a thin-wall stainless steel protective tube, a fiber bragg protection sleeve and a fiber bragg grating, wherein the two sides of the thin-wall stainless steel protective tube are respectively provided with the fiber bragg protection sleeve, the fiber bragg protection sleeve is connected with a fiber bragg grating, a temperature sensor fiber bragg grating is arranged in the thin-wall stainless steel protective tube, the middle part of the temperature sensor fiber bragg grating is provided with a glue injection port A towards the left side, the middle part of the temperature sensor fiber bragg grating is provided with a glue injection port B towards the right side, the middle part of the temperature sensor fiber bragg grating is subjected to hollow treatment, the middle part of the temperature sensor fiber bragg grating passes through the fiber bragg grating, the middle parts of the temperature sensor fiber bragg grating at the left and right sides of the glue injection port A are respectively provided with fiber bragg grating fixing ports, and the middle part of the temperature sensor fiber bragg grating is arranged at the middle part of the temperature sensor fiber bragg grating; the high-sensitivity fiber bragg grating temperature sensor has the advantages of good sealing effect and sensitive induction.
Description
Technical Field
The utility model relates to the technical field of fiber bragg gratings, in particular to a high-sensitivity fiber bragg grating temperature sensor.
Background
Since the last century, fiber optic sensing technology has been advanced, and fiber optic grating sensors developed from this have become a new basic device with communication, sensing, information processing and other technologies. Compared with the conventional electronic and mechanical sensors, the fiber bragg grating sensor has a series of uniqueness; small volume and light weight. The fiber bragg grating sensor is buried in the structure or is arranged on the surface of the structure, so that the performance of the monitored structure is slightly influenced; the measuring precision is high, and the transmission frequency bandwidth is wide. The value measured by the fiber bragg grating sensor is an absolute value, so that the measurement accuracy is improved; good electrical insulation and electromagnetic interference resistance. The fiber itself is made of silica material and is a good insulator. The fiber bragg grating sensor transmits information through light waves and cannot be subjected to electromagnetic interference.
The fiber bragg grating temperature sensor applied to the market at present has the following defects: 1. the package is too thick, so that the temperature measurement is insensitive and inaccurate; 2. the thermal expansion and contraction of the packaging structural member influence the temperature measurement data; 3. the packaging is not tight, the temperature sensor is easy to feed water, so that the service life and accuracy of the temperature grating are affected.
Disclosure of Invention
The utility model aims to provide a high-sensitivity fiber bragg grating temperature sensor so as to solve the problems in the background technology.
In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a high sensitivity fiber bragg grating temperature sensor, includes thin wall stainless steel pillar, optic fibre protection external member and optic fibre, thin wall stainless steel pillar both sides are equipped with the optic fibre protection external member respectively, optic fibre protection external member fiber connection end connects optic fibre, the inside temperature sensor fiber core that is equipped with of thin wall stainless steel pillar, temperature sensor fiber core middle part is close to the left side and is equipped with injecting glue mouth A, temperature sensor fiber core middle part is close to the right side and is equipped with injecting glue mouth B, hollow processing is done at temperature sensor fiber core middle part, temperature sensor fiber core middle part passes the fiber core, injecting glue mouth A left and right sides temperature sensor fiber core middle part is equipped with the optical fiber fixed orifices respectively, temperature sensor fiber core middle part is equipped with the temperature grating, be equipped with two sealing washer on the temperature sensor fiber core of injecting glue mouth A left side, be equipped with two on the temperature sensor fiber core of injecting glue mouth B right side, temperature sensor fiber core middle part passes the fiber core middle part, the fiber core middle part is equipped with the optical fiber fixed orifices, the optical fiber fixed orifices is equipped with two, the external member is equipped with the internal thread end, external member is equipped with to the external member.
Preferably, the optical fiber protection sleeve is inserted into the sleeve fixing opening through sleeve threads on the sleeve end and is connected with the inner threads on the sleeve fixing opening to be assembled on two sides of the fiber core of the temperature sensor, and the contact part between the sleeve end and the sleeve fixing opening is smeared with a thread glue for sealing.
Preferably, four sealing rings are arranged on two sides of the fiber core of the temperature sensor.
Preferably, the glue injection port A and the glue injection port B can be filled with sealant, so that the sealant flows into the optical fiber fixing ports at two sides of the glue injection port A and the glue injection port B.
Preferably, a through hole is formed in the middle of the temperature sensor fiber core, so that the fiber core can penetrate through the temperature sensor fiber core from left to right.
Preferably, the optical fiber is a sensor optical fiber, the optical fiber is fixed on the optical fiber protection sleeve member through gluing, and a sealing structure is arranged between the optical fiber and the optical fiber protection sleeve member.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model has reasonable structural design, the protective tube is packaged by a thin wall, the temperature grating is close to the thin wall, the temperature sensing is more sensitive and accurate, the fiber core of the sensor is designed integrally, the middle part is hollow, the bare fiber grating passes through the middle part, the temperature grating is suspended and pre-loosened, the bare fiber grating and the fiber core are adhered into a whole by glue at the two ends, the adhesion is ensured firmly, thereby avoiding the influence of heat expansion and cold contraction of a structural member on temperature measurement data, the thin wall protective tube and the fiber core are sealed by four sealing rings, the fiber protection sleeve and the fiber core are coated with screw thread glue, the sealing is stable and reliable, the long-term stability and reliability are the basis that the fiber grating sensor is approved and widely applied, and the sensor has advanced packaging structure and process, so that the temperature measurement sensitivity and the service life of the sensor can be operated stably and reliably for a long time.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present utility model;
FIG. 2 is a schematic elevational view of the present utility model;
FIG. 3 is a schematic view of the front section structure of the present utility model;
FIG. 4 is a schematic view of a temperature sensor core structure according to the present utility model;
FIG. 5 is a schematic view of the optical fiber protection kit according to the present utility model.
In the figure: 1. a thin-wall stainless steel protective tube; 2. an optical fiber protection kit; 3. an optical fiber; 4. a temperature sensor core; 5. a glue injection port A; 6. a glue injection port B; 7. an optical fiber fixing port; 8. a sleeve fixing port; 9. a sleeve end; 10. a sleeve thread; 11. a temperature grating; 12. and (3) sealing rings.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Example 1:
referring to fig. 1-5, the present utility model provides a technical solution: the high-sensitivity fiber bragg grating temperature sensor comprises a thin-wall stainless steel protective tube 1, a fiber protective sleeve 2 and a fiber 3, wherein the two sides of the thin-wall stainless steel protective tube 1 are respectively provided with the fiber protective sleeve 2, the fiber connecting end of the fiber protective sleeve 2 is connected with the fiber 3, the inside of the thin-wall stainless steel protective tube 1 is provided with a temperature sensor fiber core 4, the middle part of the temperature sensor fiber core 4 is provided with a glue injection port A5 towards the left side, the middle part of the temperature sensor fiber core 4 is provided with a glue injection port B6 towards the right side, the middle part of the temperature sensor fiber core 4 is hollow, the middle part of the temperature sensor fiber core 4 passes through the fiber core, the middle parts of the temperature sensor fiber cores 4 at the left side and the right side of the glue injection port A5 are respectively provided with a fiber fixing port 7, the middle parts of the temperature sensor fiber cores 4 at the left side and the right side of the glue injection port B6 are respectively provided with a fiber fixing port 7, the middle part of the temperature sensor fiber core 4 is provided with a temperature grating 11, the temperature sensor fiber core 4 at the left side of the glue injection port A5 is provided with two sealing rings 12, the temperature sensor fiber core 4 at the right side of the glue injection port B6 is provided with two sealing rings 12, the left side and the right side of the temperature sensor fiber core 4 are respectively provided with a sleeve fixing port 8, the inner wall of the sleeve fixing port 8 is provided with an internal thread, the right side of the optical fiber protection sleeve 2 is provided with a sleeve end 9, the sleeve end 9 is provided with a sleeve thread 10, the temperature sensor fiber core 4 adopts an integrated design, the middle part is hollow, a bare fiber grating passes through the middle part, the temperature grating 11 is suspended and is pre-loosened, the bare fiber grating and the temperature sensor fiber core 4 are adhered into a whole by glue at the four optical fiber fixing ports 7 at the two ends, and firm adhesion is ensured
Example 2:
referring to fig. 1-5, the present utility model provides a technical solution: the utility model provides a high sensitivity fiber bragg grating temperature sensor, including fiber protection external member 2, fiber protection external member 2 inserts the internal thread connection assembly on external member fixed orifices 8 inside and external member fixed orifices 8 through external member screw thread 10 on external member end 9 in temperature sensor fiber core 4 both sides, and the contact department between external member end 9 and the external member fixed orifices 8 is scribbled the screw thread and is glued sealedly, and temperature sensor fiber core 4 both sides are equipped with four sealing washer 12 altogether, and thin wall stainless steel protection tube 1 is sealed with four sealing washer between the temperature sensor fiber core 4, and fiber protection external member 2 is glued with the temperature sensor fiber core 4 and is glued the screw thread and seal, and is sealed reliable and stable.
Example 3:
referring to fig. 1-5, the present utility model provides a technical solution: the utility model provides a high sensitivity fiber bragg grating temperature sensor, including injecting glue mouth A5 and injecting glue mouth B6, injecting glue mouth A5 and injecting glue mouth B6 can pour into the sealant and make its sealant flow into the inside of the optical fiber fixed port 7 of injecting glue mouth A5 and injecting glue mouth B6 both sides, temperature sensor fiber core 4 middle part is equipped with the through-hole and can runs through temperature sensor fiber core 4 from left to right with the fiber bragg grating, fiber 3 is sensor fiber, fiber 3 is fixed in on the optical fiber protection external member 2 through gluing, be seal structure between fiber 3 and the optical fiber protection external member 2, glue and sealing washer 12 double seal make it seal more firm between thin wall stainless steel protection tube 1 and the temperature sensor fiber core 4, fiber bragg grating temperature sensor encapsulation leakproofness has been guaranteed.
Working principle: during installation, the optical fiber protection sleeve 2 is fixed on two sides of the optical fiber 3 through gluing, the optical fiber 3 core passes through the through hole in the middle of the optical fiber core 4 of the temperature sensor, screw thread sealing glue is injected into the sleeve fixing openings 8 at two ends of the optical fiber core 4 of the temperature sensor, sleeve ends 9 on the two sides of the optical fiber protection sleeve 2 are respectively inserted into the sleeve fixing openings 8 at two ends of the optical fiber core 4 of the temperature sensor, the optical fiber protection sleeve 2 is screwed by assembling the sleeve threads 10 on the sleeve ends 9 of the optical fiber protection sleeve 2 with internal threads in the sleeve fixing openings 8, enough length is reserved above the middle of the optical fiber core 4 of the temperature sensor, fixing glue is injected into the positions of the glue injection openings A5 and the glue injection openings B6 on the optical fiber protection sleeve 2, glue flows into the optical fiber fixing openings 7 at two sides of the glue injection openings A5 and the glue injection openings B6 along the glue injection openings A5, then the glue is solidified and fixed, the inside of the optical fiber fixing openings 7 is in a glue state, the optical fiber 3 core is firmly fixed through the glue, then the optical fiber 3 is firmly fixed in the fixing grooves 12 in the two sides of the optical fiber core 4 of the optical fiber, namely, the optical fiber core 12 is fixed in the groove 12 in the fixing grooves 12 on the two sides of the optical fiber core 4 of the temperature sensor, and the optical fiber core 4 is fixed on the optical fiber core 4 of the optical fiber core, namely the optical fiber core is fixed on the optical fiber core 4 by the optical fiber core, and the optical fiber core is fixed on the optical fiber core, and the optical fiber core is fixed by the optical fiber core and the optical fiber core.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides a high sensitivity fiber bragg grating temperature sensor, includes thin wall stainless steel pillar (1), optic fibre protection external member (2) and optic fibre (3), its characterized in that: the optical fiber protection sleeve comprises a thin-wall stainless steel protection tube (1), wherein two sides of the thin-wall stainless steel protection tube (1) are respectively provided with an optical fiber protection sleeve (2), an optical fiber (3) is connected to the optical fiber connection end of the optical fiber protection sleeve (2), a temperature sensor fiber core (4) is arranged inside the thin-wall stainless steel protection tube (1), an optical fiber fixing port A (5) is arranged on the left side of the middle of the temperature sensor fiber core (4), an adhesive injection port B (6) is arranged on the right side of the middle of the temperature sensor fiber core (4), hollow processing is carried out on the middle of the temperature sensor fiber core (4), the middle of the temperature sensor fiber core (4) penetrates through the optical fiber core, optical fiber fixing ports (7) are respectively arranged in the middle of the temperature sensor fiber connection ends of the left side and the right side of the optical fiber protection sleeve (2), optical fiber fixing ports (7) are respectively arranged in the middle of the temperature sensor fiber core (4) on the left side and the right side of the temperature sensor fiber core (6), a temperature grating (11) is arranged on the middle of the temperature sensor fiber core (4), an adhesive injection port B (4) is arranged on the left side, an adhesive injection port B (12) is arranged on the left side of the temperature sensor fiber core (4), two sealing rings (8) are respectively arranged on the two inner wall of the fiber fixing ports (8), the right side of the optical fiber protection sleeve (2) is provided with a sleeve end (9), and the sleeve end (9) is provided with a sleeve thread (10).
2. The high sensitivity fiber bragg grating temperature sensor of claim 1, wherein: the optical fiber protection sleeve (2) is inserted into the sleeve fixing opening (8) through sleeve threads (10) on the sleeve end (9) and is connected with internal threads on the sleeve fixing opening (8) to be assembled on two sides of the fiber core (4) of the temperature sensor, and a contact part between the sleeve end (9) and the sleeve fixing opening (8) is smeared with a thread glue for sealing.
3. The high sensitivity fiber bragg grating temperature sensor of claim 1, wherein: four sealing rings (12) are arranged on two sides of the fiber core (4) of the temperature sensor.
4. The high sensitivity fiber bragg grating temperature sensor of claim 1, wherein: the glue injection port A (5) and the glue injection port B (6) can be filled with sealant, so that the sealant flows into the optical fiber fixing ports (7) at two sides of the glue injection port A (5) and the glue injection port B (6).
5. The high sensitivity fiber bragg grating temperature sensor of claim 1, wherein: the middle part of the temperature sensor fiber core (4) is provided with a through hole which can enable the fiber core to penetrate through the temperature sensor fiber core (4) from left to right.
6. The high sensitivity fiber bragg grating temperature sensor of claim 1, wherein: the optical fiber (3) is a sensor optical fiber, the optical fiber (3) is fixed on the optical fiber protection sleeve member (2) through gluing, and a sealing structure is arranged between the optical fiber (3) and the optical fiber protection sleeve member (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320292899.3U CN219161498U (en) | 2023-02-22 | 2023-02-22 | High-sensitivity fiber bragg grating temperature sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320292899.3U CN219161498U (en) | 2023-02-22 | 2023-02-22 | High-sensitivity fiber bragg grating temperature sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219161498U true CN219161498U (en) | 2023-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320292899.3U Active CN219161498U (en) | 2023-02-22 | 2023-02-22 | High-sensitivity fiber bragg grating temperature sensor |
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| Country | Link |
|---|---|
| CN (1) | CN219161498U (en) |
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- 2023-02-22 CN CN202320292899.3U patent/CN219161498U/en active Active
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