CN117949110A - Fiber bragg grating temperature sensor and packaging method thereof - Google Patents
Fiber bragg grating temperature sensor and packaging method thereof Download PDFInfo
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- CN117949110A CN117949110A CN202311655605.XA CN202311655605A CN117949110A CN 117949110 A CN117949110 A CN 117949110A CN 202311655605 A CN202311655605 A CN 202311655605A CN 117949110 A CN117949110 A CN 117949110A
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- stainless steel
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The sensor comprises an optical fiber grating, a high-temperature resistant sleeve, solder, heat-conducting silicone grease, a quick adhesive, a bare optical fiber, a stainless steel shell and a stainless steel upper cover; the stainless steel shell is of an open box-shaped structure, and U-shaped grooves are formed in two end faces of the stainless steel shell; forming an optical fiber grating on a part of the bare optical fiber through laser etching; welding materials are welded on two sides of the fiber bragg grating, the bare optical fiber is placed in the stainless steel shell through an opening of the stainless steel shell and U-shaped grooves on two end faces, and the welding materials are also positioned in the stainless steel shell; the high-temperature resistant sleeve is sleeved at two ends of the bare optical fiber until the welding part of the welding flux, and the bare optical fiber is adhered to the high-temperature resistant sleeve by using a quick adhesive; at the U-shaped groove of the stainless steel shell, the high-temperature resistant sleeve is bonded with the U-shaped groove of the stainless steel shell by using a quick adhesive; the stainless steel upper cover is connected with the stainless steel shell and then laser packaged into a whole, and the whole is filled with heat-conducting silicone grease.
Description
Technical Field
The invention relates to a fiber grating temperature sensor and a packaging method thereof, belonging to the technical field of fiber grating temperature sensors.
Background
The temperature measurement requirement widely exists in various industrial and manufacturing fields such as aerospace, petrochemical industry, metallurgical manufacturing, automobile engines and the like, wherein the high-temperature environment is accompanied by interference of factors such as vibration, strong electromagnetic interference and the like, and the high-temperature sensor has higher requirements on the anti-interference performance and durability; the sensors which are widely used at present are thermocouple sensors, infrared radiation thermometers and fiber bragg grating sensors: thermocouple sensors are the main means of industrial high-temperature measurement at present, but are easy to be interfered by electromagnetic interference, and the sensors are poor in stability and repeatability, and are required to be replaced frequently, so that the cost is high; the infrared radiation thermometer is used for non-contact temperature measurement, and the infrared radiation thermometer cannot be blocked, so that the infrared radiation thermometer can only be used for detecting the temperature of a surface part, and has the advantages of limited measurement range and low precision; the fiber grating sensor is a typical fiber sensor, and the fiber grating is formed by forming a diffraction grating in the fiber by a specific method such as ultraviolet exposure, and the fiber grating is manufactured on the fiber itself, so that the fiber grating sensor has the advantages of all the fibers. The sensor has the advantages of small volume, high induction sensitivity, corrosion resistance, electromagnetic interference resistance, easiness in networking and the like, and is widely applied to the sensing fields of aerospace, precise instruments, wearable equipment and the like.
The existing fiber bragg grating is an optical passive filter device with fiber core refractive index showing periodic distribution, and has the most application potential in the aspect of temperature measurement sensing technology in recent years; however, the bare fiber grating itself is a common fiber, so it is very fragile. In the existing packaging mode, steel pipes are mostly adopted as carriers, epoxy resin, silicone rubber and the like are poured into two ends of the steel pipes to serve as packaging materials, and a large amount of adhesives are used, so that the phenomena of glue aging, sliding, creep and the like exist, and the effectiveness of the fiber bragg grating sensor in the service process and the durability of long-term testing are difficult to ensure. In actual use, the fiber Bragg grating is packaged first, so that the grating is stably fixed on the core stress position of the sensor, and the application condition in actual engineering can be met.
Disclosure of Invention
The invention aims to solve the technical problems that: overcomes the defects of the prior art and improves the encapsulation effect of the fiber grating temperature sensor.
The invention aims at realizing the following technical scheme:
A fiber grating temperature sensor comprises a fiber grating, a high temperature resistant sleeve, solder, heat conduction silicone grease, a quick adhesive, a bare fiber, a stainless steel shell and a stainless steel upper cover;
the stainless steel shell is of an open box-shaped structure, and U-shaped grooves are formed in two end faces of the stainless steel shell;
Forming an optical fiber grating on a part of the bare optical fiber through laser etching; welding materials are welded on two sides of the fiber bragg grating, the bare optical fiber is placed in the stainless steel shell through an opening of the stainless steel shell and U-shaped grooves on two end faces, and the welding materials are also positioned in the stainless steel shell;
the high-temperature resistant sleeve is sleeved at two ends of the bare optical fiber until the welding part of the welding flux, and the bare optical fiber is adhered to the high-temperature resistant sleeve by using a quick adhesive;
At the U-shaped groove of the stainless steel shell, the high-temperature resistant sleeve is bonded with the U-shaped groove of the stainless steel shell by using a quick adhesive;
The shape of the stainless steel upper cover is matched with the shape of the opening of the stainless steel shell, and the stainless steel upper cover is used for being connected with the stainless steel shell and then laser packaged into a whole, and the whole is filled with heat-conducting silicone grease.
In one embodiment of the fiber grating temperature sensor of the present invention, the solder is a ring-shaped structure of silica material.
In one embodiment of the fiber bragg grating temperature sensor of the present invention, the fiber bragg grating is stress-free and packaged in a middle position within the stainless steel housing.
In one embodiment of the fiber grating temperature sensor, the grating area length of the fiber grating is 7-8 mm.
The packaging method based on the fiber bragg grating temperature sensor comprises the following steps:
Straightening out the bare optical fiber, and putting two circular glass solders on the bare optical fiber and positioned on two sides of a fiber grating of the bare optical fiber;
The bare optical fiber is placed into the stainless steel shell through the opening of the stainless steel shell and the U-shaped grooves on the two end faces, the stainless steel shell is fixed, the fiber grating is moved to a preset position, the bare optical fiber is pressed tightly, the solder is moved to the preset position, and the bare optical fiber is pre-tensioned;
Heating and flattening the solder to finish welding;
filling heat-conducting silicone grease in the stainless steel shell;
the high-temperature resistant sleeve is sleeved at two ends of the bare optical fiber, and the bare optical fiber is bonded with the high-temperature resistant sleeve by using a quick adhesive;
At the U-shaped groove of the stainless steel shell, the high-temperature resistant sleeve is bonded with the U-shaped groove of the stainless steel shell by using a quick adhesive;
and (3) covering the stainless steel upper cover, and packaging the stainless steel upper cover and the stainless steel shell into a whole by using laser.
In one embodiment of the packaging method of the present invention, the fiber bragg grating is stress-free packaged in a middle position within the stainless steel housing.
In one embodiment of the packaging method, after the two ends of the bare optical fiber are sleeved with the high-temperature resistant sleeves, the bare optical fiber is clung to the U-shaped groove of the stainless steel shell.
In one embodiment of the packaging method of the invention, the grating area length of the fiber bragg grating is 7-8 mm.
In one embodiment of the packaging method, the fiber bragg grating is pre-fixed by passing two solders through the bare fiber before packaging, and the fiber bragg grating is pre-tensioned by using weights.
In one embodiment of the packaging method of the invention, when welding the solder, the solder is heated, and when the solder becomes soft, tweezers are used for flattening the solder, so that the solder is heated more uniformly, and after the solder is completely melted, the heating is stopped.
Compared with the prior art, the invention has the following beneficial effects:
(1) The fiber bragg grating is packaged in the stainless steel shell, so that the mechanical strength of the sensor is improved, and the sensor is prevented from being interfered by surrounding environmental stress;
(2) The stainless steel shell is filled with heat-conducting silicone grease, so that the fiber grating sensor has the characteristic of high temperature resistance;
(3) The fiber bragg grating sensor applying the packaging method can be applied to the field of aerospace and has flight experience;
(4) The packaging method can realize the series connection of a plurality of fiber grating sensors, realize the simultaneous temperature measurement of a plurality of temperature points, and has wide measurable area and flexible layout;
(5) The temperature measuring sensor has the advantages of small volume, light weight, high induction sensitivity, corrosion resistance and electromagnetic interference resistance, and can be used in multiple scenes such as aerospace, precise instruments, wearable equipment and the like.
Drawings
FIG. 1 is a schematic diagram of the packaged appearance of a fiber grating temperature sensor;
Fig. 2 is a schematic structural diagram of an internal package of a fiber grating sensor according to the present invention.
Reference numerals: the high-temperature-resistant fiber grating comprises a fiber grating (1), a high-temperature-resistant sleeve (2), a solder (3), heat-conducting silicone grease (4), a quick adhesive (5), a bare fiber (6), a stainless steel shell (7) and a stainless steel upper cover (8).
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
The fiber bragg grating temperature sensor comprises a fiber bragg grating 1, a high-temperature-resistant sleeve 2, solder 3, heat-conducting silicone grease 4, a quick adhesive 5, a bare fiber 6, a stainless steel shell 7 and a stainless steel upper cover 8;
The stainless steel shell 7 is of an open box-shaped structure, and U-shaped grooves are formed in two end faces of the stainless steel shell 7, as shown in fig. 1;
The shape of the stainless steel upper cover 8 is matched with the shape of the opening of the stainless steel shell 7, as shown in figure 1, and the stainless steel upper cover is used for being integrally packaged with the stainless steel shell 7 after being connected;
the solder 3 is a circular ring structure made of silicon dioxide, as shown in fig. 2 in a top view;
the heat-conducting silicone grease 4 is filled between the fiber grating 1 and the stainless steel shell 7, as shown in fig. 2;
The fiber bragg grating 1 is packaged in the middle position in the stainless steel shell 7 in a stress-free manner, and bare fibers 6 at two ends extend out of the stainless steel shell 7;
the bare optical fiber 6 is made of pure quartz, and is sleeved with high-temperature resistant sleeves 2 at two ends, and is tightly attached to a U-shaped groove of the stainless steel shell 7.
The fiber grating 1 is written on the bare fiber 6 with a femtosecond laser.
After the encapsulation of the fiber grating temperature sensor is completed, the stainless steel area of the fiber grating temperature sensor is a cuboid, and the size of the cuboid is 26mm long, 3mm wide and 3mm high.
The grating region length of the fiber grating 1 is 7-8 mm, as shown in fig. 2.
The length of the optical fibers on both sides outside the package is about 50cm, as shown in fig. 1 and 2.
Before packaging, the fiber bragg grating 1 is characterized in that two pieces of annular glass solder 3 are inserted into the optical fiber in advance, fixed before packaging, and the optical fiber is prestretched by using a 100g weight.
The optical fiber grating 1 is pre-fixed before packaging, the solder 3 is softened by heating the solder 3 (heating to 300-350 ℃), the solder 3 is flattened by tweezers, and when the temperature is reduced to 100 ℃, the optical fiber between two welding spots can be observed to slightly arch upwards.
The bare optical fiber 6 is characterized in that after the heat-conducting silicone grease 4 is filled between the fiber grating 1 and the stainless steel shell 7, the heat-conducting silicone grease 4 is filled in the stainless steel shell 7;
selecting two sections of high-temperature resistant sleeves 2 with the length of 50cm, sleeving the two ends of the bare optical fiber 6, and bonding the bare optical fiber 6 and the high-temperature resistant sleeves 2 by using a quick adhesive 5;
At the U-shaped groove of the stainless steel shell 7, the high-temperature resistant sleeve 2 is adhered to the U-shaped groove of the stainless steel shell 7 by using a quick adhesive 5; the stainless steel upper cover 8 is covered, and the stainless steel upper cover 8 and the stainless steel shell 7 are packaged into a whole by using laser.
The packaging of the fiber bragg grating temperature sensor comprises the following steps: pretreatment of the fiber grating 1, encapsulation and solidification of the fiber grating 1 and perfecting protection measures;
Straightening out the bare optical fiber 6, and putting two circular glass solders 3 on the bare optical fiber 6 and on two sides of the fiber grating 1 of the bare optical fiber 6, as shown in fig. 2;
the bare optical fiber 6 is placed into the stainless steel shell 7 through the opening of the stainless steel shell 7 and the U-shaped grooves on the two end faces, the stainless steel shell 7 is fixed, the fiber grating 1 is moved to a preset position, the bare optical fiber 6 is pressed tightly, the solder 3 is moved to a preset position, and the bare optical fiber 6 is pre-tensioned;
prestretching the optical fiber: the bare fiber 6 was wound around one end of the long rod (four turns) and around one end of the short rod (one turn), and then a weight (weight 100 g) for pre-stretching the bare fiber 6 was fixed with an adhesive tape.
And heating the solder 3, flattening the solder 3 by using tweezers when the solder 3 is softened (the solder is softened when the temperature is 300-350 ℃) so that the solder is heated more uniformly, and stopping heating after the solder is completely melted. When the temperature at the position A, B is reduced to 100 ℃, the optical fiber between the two solders 3 is observed to slightly arch upwards, and then the stainless steel shell with the optical fiber grating 1 fixed can be taken out.
A pore-free isolating film is arranged under the sensor, a proper amount of heat-conducting silicone grease is picked up by a toothpick, is put into a stainless steel shell 7 and fills up the whole groove, and then the overflowed heat-conducting silicone grease 4 is scraped off by a clean toothpick. Taking two high-temperature-resistant sleeves 2 with the length of about 50cm, penetrating from two ends of a bare optical fiber respectively until the two sleeves just contact with solder 3, extruding a quick adhesive 5 on the high-temperature-resistant sleeves 2 extending into a stainless steel shell 7, rotating the high-temperature-resistant sleeves 2 for one circle to ensure that the quick adhesive 5 on the surfaces of the high-temperature-resistant sleeves 2 is uniform, pressing the high-temperature-resistant sleeves 2 downwards by toothpicks to ensure that the high-temperature-resistant sleeves 2 are adhered with the stainless steel shell 7, blocking holes of the high-temperature-resistant sleeves 2 and the bare optical fiber 6 at two end faces of the stainless steel shell 7 by using the quick adhesive 5, covering a stainless steel upper cover 8, and sealing and welding the stainless steel upper cover and the stainless steel shell by using laser to finish packaging of the fiber grating temperature sensor.
What is not described in detail in the present specification is a well known technology to those skilled in the art.
Although the present invention has been described in terms of the preferred embodiments, it is not intended to be limited to the embodiments, and any person skilled in the art can make any possible variations and modifications to the technical solution of the present invention by using the methods and technical matters disclosed above without departing from the spirit and scope of the present invention, so any simple modifications, equivalent variations and modifications to the embodiments described above according to the technical matters of the present invention are within the scope of the technical matters of the present invention.
Claims (10)
1. The fiber bragg grating temperature sensor is characterized by comprising a fiber bragg grating (1), a high-temperature-resistant sleeve (2), solder (3), heat-conducting silicone grease (4), a quick adhesive (5), a bare fiber (6), a stainless steel shell (7) and a stainless steel upper cover (8);
The stainless steel shell (7) is of an open box-shaped structure, and U-shaped grooves are formed in two end faces of the stainless steel shell (7);
forming an optical fiber grating (1) by laser etching on a part of the bare optical fiber (6); the welding flux (3) is welded at two sides of the fiber bragg grating (1), the bare optical fiber (6) is placed into the stainless steel shell (7) through an opening of the stainless steel shell (7) and U-shaped grooves at two end faces, and the welding flux (3) is also positioned in the stainless steel shell (7);
The high-temperature resistant sleeve (2) is sleeved at two ends of the bare optical fiber (6) until the welding part of the solder (3), and the bare optical fiber (6) and the high-temperature resistant sleeve (2) are bonded by using the quick adhesive (5);
at the U-shaped groove of the stainless steel shell (7), the high-temperature resistant sleeve (2) is adhered to the U-shaped groove of the stainless steel shell (7) by using a quick adhesive (5);
The shape of the stainless steel upper cover (8) is matched with the shape of the opening of the stainless steel shell (7), and the stainless steel upper cover is used for being connected with the stainless steel shell (7) and then packaged into a whole by laser, and the whole is filled with the heat-conducting silicone grease (4).
2. Fiber grating temperature sensor according to claim 1, characterized in that the solder (3) is a ring-like structure of silicon dioxide material.
3. Fiber grating temperature sensor according to claim 1, characterized in that the fiber grating (1) is stress-free encapsulated in a stainless steel housing (7) at an intermediate position.
4. Fiber grating temperature sensor according to claim 1, characterized in that the grating area length of the fiber grating (1) is 7-8 mm.
5. A method of packaging a fiber bragg grating temperature sensor in accordance with claim 1, comprising:
Straightening out the bare optical fiber (6), and putting two circular glass solders (3) on the bare optical fiber (6) and positioned at two sides of the fiber grating (1) of the bare optical fiber (6);
The bare optical fiber (6) is placed into the stainless steel shell (7) through an opening of the stainless steel shell (7) and U-shaped grooves on two end faces, the stainless steel shell (7) is fixed, the fiber grating (1) is moved to a preset position, the bare optical fiber (6) is pressed tightly, the solder (3) is moved to a set position, and the bare optical fiber (6) is pre-tensioned;
Heating the solder (3) and flattening to finish welding;
The stainless steel shell (7) is filled with heat-conducting silicone grease (4);
The high-temperature resistant sleeve (2) is sleeved at two ends of the bare optical fiber (6), and the bare optical fiber (6) is bonded with the high-temperature resistant sleeve (2) by using the quick adhesive (5);
at the U-shaped groove of the stainless steel shell (7), the high-temperature resistant sleeve (2) is adhered to the U-shaped groove of the stainless steel shell (7) by using a quick adhesive (5);
And (3) covering the stainless steel upper cover (8), and packaging the stainless steel upper cover (8) and the stainless steel shell (7) into a whole by using laser.
6. Packaging method according to claim 5, characterized in that the fiber grating (1) is stress-free packaged in an intermediate position within the stainless steel housing (7).
7. The packaging method according to claim 5, wherein the two ends of the bare optical fiber (6) are tightly attached to the U-shaped groove of the stainless steel shell (7) after being sleeved with the high temperature resistant sleeve (2).
8. The packaging method according to claim 5, characterized in that the grating area length of the fiber grating (1) is 7-8 mm.
9. Packaging method according to claim 5, characterized in that the fiber grating (1) is pre-packaged with two solders (3) through the bare fiber (6) before packaging, pre-packaged fixed and pre-tensioned with weights.
10. The packaging method according to claim 5, wherein the solder (3) is heated when the solder (3) is soldered, and the solder (3) is flattened by tweezers when the solder (3) is softened, so that the solder is heated more uniformly, and the heating is stopped after the solder is completely melted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311655605.XA CN117949110A (en) | 2023-12-05 | 2023-12-05 | Fiber bragg grating temperature sensor and packaging method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311655605.XA CN117949110A (en) | 2023-12-05 | 2023-12-05 | Fiber bragg grating temperature sensor and packaging method thereof |
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| CN117949110A true CN117949110A (en) | 2024-04-30 |
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| CN202311655605.XA Pending CN117949110A (en) | 2023-12-05 | 2023-12-05 | Fiber bragg grating temperature sensor and packaging method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118392343A (en) * | 2024-05-23 | 2024-07-26 | 中建材光子科技有限公司 | High dynamic response, high accuracy optical fiber temperature sensor |
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2023
- 2023-12-05 CN CN202311655605.XA patent/CN117949110A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118392343A (en) * | 2024-05-23 | 2024-07-26 | 中建材光子科技有限公司 | High dynamic response, high accuracy optical fiber temperature sensor |
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