CN211696733U - High-precision FBG high-temperature sensor - Google Patents
High-precision FBG high-temperature sensor Download PDFInfo
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- CN211696733U CN211696733U CN201922243308.XU CN201922243308U CN211696733U CN 211696733 U CN211696733 U CN 211696733U CN 201922243308 U CN201922243308 U CN 201922243308U CN 211696733 U CN211696733 U CN 211696733U
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Abstract
The utility model provides a high accuracy FBG high temperature sensor, this sensor includes: the optical fiber is positioned at the center of the sensor, and a first sensitization FBG for temperature compensation and a second sensitization FBG for temperature measurement are arranged on the optical fiber along the axial direction of the optical fiber; and the packaging shell sleeve is coaxially sleeved outside the optical fiber. The utility model discloses high accuracy FBG high temperature sensor can have higher sensitivity in high temperature environment to have fine linearity in the threshold, can satisfy the energy, the high temperature monitoring operating mode of most fields such as space flight.
Description
Technical Field
The utility model relates to a high temperature monitoring equipment field, concretely relates to high accuracy FBG high temperature sensor.
Background
An optical fiber sensor is a sensor that converts the state of an object to be measured into a measurable optical signal. Since the birth of the optical fiber sensor, the optical fiber sensor is widely applied to a plurality of traditional sensing fields because of the advantages of electromagnetic interference resistance, intrinsic safety, small volume, light weight, easiness in embedding into materials and the like.
The aerospace field is used as a new deer-by-deer ground of national science and technology, and is the best embodiment of comprehensive strength of the national science and technology level. With the implementation of the 'three-depth' strategy of the country in deep land, deep space and deep sea, the deep space has become a common development direction of various countries in the aerospace field, but the severe environments such as high temperature and strong electromagnetic interference in the deep space can cause immeasurable damage to the aircraft during service. Therefore, reliability research on aircraft in such harsh environments has become a major issue. With the revolution of fuels containing space flight, the working process of an aircraft fuel tank is in a high-temperature state, and the whole structural component is in a high-temperature working process. With the rapid development of science and technology, particularly the implementation of space manned plans, the application field of aerospace vehicles is continuously expanded, and optical fiber sensors are outstanding in the sensing field, so that effective real-time monitoring of severe environments, particularly high-temperature environments, is necessary for ensuring personal and property safety. Petrochemical is the leading force of the energy industry. Petrochemical industry is irreplaceable in many fields in national economy, and the petrochemical industry is a very important industry in national economy. In the production process, general operation is in a high-temperature environment, and petroleum products are flammable and explosive, so that once a fire and explosion accident happens, great loss can be caused. With the rapid development of the petrochemical industry, the safety and health monitoring of the petrochemical industry are very important.
The working principle of the traditional FBG temperature sensor is that when the external temperature changes, the Bragg grating can change sensitively, so that light different from the calibration wavelength is reflected. However, the FBG degradation phenomenon in which the reflected light power becomes smaller becomes more and more significant at higher temperatures. During the fabrication of FBGs, the carrier transitions are distributed to energy levels with different energies, the higher the energy level the higher the energy required for the decay to occur. The higher the temperature, the fewer the number of carriers that maintain the transition state, and the more severe the degradation, and when the temperature is too high above a threshold, the reflected light power becomes zero.
FBG has obvious advantages in terms of integration and networking. Due to the characteristic of very small volume of the fiber grating, each probe point only uses a relatively small light source component, and most of light can be transmitted and continuously transmitted. The maximum number of 30 gratings can be simultaneously used on one optical fiber, and the transmission distance exceeds 45km, which brings great convenience to networking. Meanwhile, the feasibility of the technology is improved by using technologies such as wavelength division multiplexing and the like. In general, FBGs have great advantages in a wide range of multi-node measurements.
The existing FBG temperature sensor technology is relatively mature, but in the high-temperature field, the FBG temperature sensor has the defects of low sensitivity, low reliability, low precision and the like. Particularly in high and new technical fields such as aerospace and the like, the traditional sensor cannot meet the industrial requirements due to non-functional defects such as overlarge function and body size, and therefore a high-precision sensor is urgently required to be developed. Aiming at high-temperature working conditions in the fields of aerospace, hot well oil fields and the like, the FBG has the high-precision sensing capability under the working conditions due to the inherent advantages of the FBG.
SUMMERY OF THE UTILITY MODEL
Not enough to current FBG temperature sensor, the utility model aims to provide a high accuracy FBG high temperature sensor, this sensor can have higher sensitivity in high temperature environment to have fine linearity in the threshold, can satisfy the energy, the aerospace most high temperature monitoring operating mode in fields such as.
In order to realize the technical purpose, the utility model adopts the following technical scheme:
a high-precision FBG high-temperature sensor comprises:
the optical fiber is positioned at the center of the sensor, and a first sensitization FBG for temperature compensation and a second sensitization FBG for temperature measurement are arranged on the optical fiber along the axial direction of the optical fiber;
the packaging shell sleeve is coaxially sleeved outside the optical fiber and comprises three sections, namely a first packaging shell sleeve sleeved at one end of the optical fiber and corresponding to the first sensitization FBG, a second packaging shell sleeve sleeved at the middle part of the optical fiber and corresponding to the second sensitization FBG, and a third packaging shell sleeve sleeved at the other end of the optical fiber;
the first anchoring end is arranged between the first packaging shell sleeve and the optical fiber and used for limiting one end of the optical fiber;
the second anchoring end is arranged between the second packaging shell sleeve and the two sensitivity enhancing FBGs on the optical fiber and is used for limiting the expansion and contraction of the first sensitivity enhancing FBG on the optical fiber;
the heat-insulating sleeve is used for insulating optical fibers and comprises a first heat-insulating sleeve, a second heat-insulating sleeve and a third heat-insulating sleeve, wherein,
the first heat-insulating sleeve is arranged inside the sensor and positioned between the first anchoring end and the second anchoring end;
the second insulation sleeve is arranged inside the sensor and positioned between the second anchoring end and the third anchoring end:
the third heat-insulating sleeve is arranged outside the packaging shell sleeve, the inner wall of one end of the third heat-insulating sleeve is fixedly connected with the outer wall of the second packaging shell sleeve in a sealing way, and the inner wall of the other end of the third heat-insulating sleeve is fixedly connected with the outer wall of the third packaging shell sleeve in a sealing way;
the third anchoring end is used for limiting the other end of the optical fiber, the whole third anchoring end is cured and molded in a third packaging sleeve, and the third packaging sleeve is sleeved with the third heat-insulating sleeve;
the fourth anchoring end is arranged between the second heat-insulation sleeve and the second packaging shell sleeve;
a first annular heat-preservation area is formed in the sensor by enclosing the first anchoring end, the second anchoring end, the first heat-preservation sleeve and the first packaging shell sleeve;
the second anchoring end, the fourth anchoring end, the second heat-insulation sleeve and the second packaging shell sleeve are enclosed to form a second annular heat-insulation area;
the first annular heat-preservation area and the second annular heat-preservation area are filled with heat-preservation and heat-insulation materials;
an annular temperature sensing area is formed in the sensor by enclosing the fourth anchoring end, the third anchoring end, the second heat insulation sleeve and the third heat insulation sleeve, and high-temperature linear expansion materials are filled in the annular temperature sensing area.
The high-temperature linear expansion material is silicon rubber or fluororubber.
The heat-insulating material is powdered silica fume with refractoriness>The density reaches (1.6-1.7) g/cm at 1600 DEG C3More than 80% of the particles with fineness less than 1 μm, average particle diameter of 0.1-0.3 μm, and specific surface area of 20-28 m2/g。
The length of the sensor is 100 mm and 300mm, and the diameter of the sensor is 4-15 mm.
The packaging shell sleeve is made of a material with high thermal conductivity.
The third heat-insulating sleeve is made of carbon fiber materials.
Compare with current FBG temperature sensor, the utility model discloses the beneficial effect who has does:
the optical fiber has good tensile property which can reach 8000
Therefore, the optical fiber is stretched by means of thermal expansion of the silicon rubber, and the high-temperature monitoring threshold value of the sensor can be remarkably improved. Meanwhile, the sensor has better temperature linearity thanks to the good thermal effect of the expansion material.
1. The sensor adopts a temperature compensation and temperature measurement double FBG design, and the temperature compensation FBG can obviously eliminate wavelength nonlinear drift caused by the temperature of the temperature measurement FBG in a high-temperature environment;
2. the sensor has small overall dimension and small space occupation, and a plurality of sensors can be integrated to realize a networking high-temperature sensing system;
3. the sensor grating is packaged by a material with excellent heat insulation effect, and has higher reflected light power in a higher temperature field;
4. the silicon rubber used for the temperature sensing part of the sensor has stable high-temperature performance and can play a linear thermal expansion role at a higher temperature;
5. the sensor is suitable for various high-temperature working conditions such as a hot well oil field, aerospace and the like, and has wide application range and high temperature measurement precision.
Drawings
Fig. 1 is a schematic structural view of a high-precision FBG high-temperature sensor of the present invention;
wherein, 1, optical fiber; 201. a first sensitivity enhancing FBG; 202. a second sensitized FBG; 301. a first package housing sleeve; 302. a second package housing sleeve; 303. a third package housing sleeve; 401. a first heat-insulating sleeve; 402. a second heat-insulating sleeve; 403. a third heat-insulating sleeve; 501. a first anchoring end; 502. a second anchoring end; 503. a fourth anchoring end; 504. a third anchoring end; 601. a first annular insulating region; 602. a second annular insulating region; 7. an annular temperature sensing region;
FIG. 2 is a schematic view of the overall structure of a high-precision FBG high-temperature sensor of the present invention;
FIG. 3 is a central cross-sectional view of a high-precision FBG high-temperature sensor of the present invention;
fig. 4 is the utility model relates to a high accuracy FBG high temperature sensor sensing system schematic diagram.
8, armored optical cables; 9. a data processing terminal; 10. FBG demodulator.
Detailed Description
According to the utility model discloses a first embodiment provides a high accuracy FBG high temperature sensor.
A high-precision FBG high-temperature sensor comprises an optical fiber 1, a first heat-insulating sleeve 401, a second heat-insulating sleeve 402, a third heat-insulating sleeve 403, a first packaging casing sleeve 301, a second packaging casing sleeve 302, a third packaging casing sleeve 303, silicon rubber, a first anchoring end 501, a second anchoring end 502, a third anchoring end 504, a fourth anchoring end 503, a first annular heat-insulating area 601, a second annular heat-insulating area 602 and an annular heat-sensing area 7.
The optical fiber passes through the first heat-insulating sleeve 401, the outside of the position where the grating is located is filled with heat-insulating materials, and the outside of the heat-insulating materials is a packaging shell sleeve.
The first sensitization FBG201 is used for temperature compensation, one end of the second sensitization FBG202 is anchored with one end of the first sensitization FBG201, the other end of the second sensitization FBG202 sequentially penetrates through the first heat-insulating sleeve 401, the second heat-insulating sleeve 402 and the silicon rubber temperature sensing area, and finally the second sensitization FBG is anchored by the third anchoring end 504.
Preferably, the armored optical fiber is led out from the temperature compensation end of the sensor and can be directly connected with the demodulation equipment and the data analysis processing terminal.
The utility model discloses in, in the anchor end adopts high temperature resistant epoxy, doped high temperature resistant ceramic powder and high temperature resistant metal powder, showing like this and improving the vitrified threshold temperature of epoxy, the preferred ratio of experiment: the ratio of the epoxy resin to the high-temperature resistant ceramic powder to the high-temperature resistant metal powder is 1: 2.75: 7.08.
Preferably, the high-temperature resistant metal powder is high-fineness high-temperature resistant nickel powder.
The utility model discloses in, annular temperature sensing area 7 is enclosed to close by third insulation support 403, second insulation support 402, third anchor end 504 and fourth anchor end 502 and forms. The above structure ensures that its resistance in the longitudinal direction of the sensor is mainly provided by the optical fiber.
Preferably, the annular temperature sensing region 7 of the sensor is connected to the first package casing sleeve where the first sensitized FBG is located through a third insulating sleeve.
Preferably, the annular temperature sensing area 7 of the sensor is filled with silicone rubber. The third insulating sleeve is made of carbon fiber material, and the right end of the third insulating sleeve is attached to the pipe orifice of the second insulating sleeve 402 and the third anchoring end 504.
In the present invention, the length of the high temperature sensor is 100-. The maximum external diameter is 4-15mm, more preferably 5-10mm, for example 7 mm. The minimum external diameter is 1-7mm, preferably 2-6mm, more preferably 3-5mm, e.g. 4 mm.
The utility model discloses in, this sensor has contained the first sensitization FBG that is used for temperature compensation and the second sensitization FBG that is used for the temperature measurement. The temperature sensitivity of the first sensitized FBG is 10.5 pm/DEG C, and the strain sensitivity is 1.2 pm/^ 4
The overall sensor sensitivity can reach (590-790) × 1.2.2 pm/DEG C.
The sensor has the following principle: when the sensor is placed in a high temperature environment, both FBG grids will change correspondingly due to temperature changes, but the wavelength shift caused by temperature is not linear. The thermal expansion of the high temperature linear expansion material in the annular temperature sensing area can provide an axial effect for the temperature measurement FBG, the effect can cause the temperature measurement FBG to generate very sensitive wavelength drift, and the wavelength drift of the temperature measurement FBG comes from two external factors: the temperature and the stress, and the function of the temperature compensation FBG can well eliminate the nonlinear influence brought by the temperature of the temperature measurement FBG.
According to the second embodiment of the present invention, a method for manufacturing a high-precision FBG high-temperature sensor is provided.
The utility model relates to a manufacturing method of high accuracy FBG high temperature sensor, this method contains following step:
1) annealing: and (3) putting the optical fiber containing the two sensitized FBGs into a tube furnace for annealing treatment. Firstly, the grating part of the optical fiber is arranged in the middle of a tube furnace, the two ends of the optical fiber are fixed to be suspended in the furnace, furnace mouths at the two ends of the optical fiber are plugged by high-temperature cotton, the temperature of the tube furnace is increased to 500 ℃, the constant temperature is kept for 24 hours after the temperature is stabilized, and the optical fiber is taken out and cooled to the room temperature.
2) Packaging: the second encapsulating shell sleeve is filled with heat insulating material, then the second heat insulating sleeve 402 is led into the tube to be positioned in the center of the encapsulating shell sleeve, and the first encapsulating shell sleeve 301 is similar to the first encapsulating shell sleeve 301, but the optical fiber anchoring ends are reserved at the two ends of the first encapsulating shell sleeve. The optical fiber is led into the second heat-insulating sleeve 402, the anchoring ends at the joints of the two packaging shell sleeves are filled with high-temperature-resistant epoxy resin matched with a curing agent, and after the two sensitivity-enhancing FBGs are positioned in the middle of each packaging shell sleeve, the joints of the packaging shell sleeves are blown by a hot air gun to be cured. And then straightening the optical fiber to solidify the left anchoring end of the temperature compensation sensor. The outer wall of the anchoring part at the right side of the casing of the packaging shell is coated with high-temperature-resistant epoxy resin, the casing is sleeved with a silicon rubber heat-insulating casing, the casing is cured by a hot air gun, and silicon rubber is filled into the third heat-insulating casing to reach the position of the pipe orifice of the second heat-insulating casing 402.
The third package housing sleeve 303 is filled with high temperature resistant epoxy resin (a gap is left at both ends), the optical fiber is introduced, the third package housing sleeve 303 is inserted into the first heat-preserving sleeve 401, and the high temperature resistant epoxy resin inside the third package housing sleeve is cured by the hot air gun.
The third package housing sleeve 303 is clamped by pliers and slightly rotated to ensure a certain mobility, and the first heat-insulating sleeve 401 is repeatedly blown by a hot air gun to accelerate the curing of the silicone rubber. And finally, sheathing optical fibers at two ends of the sensor to finish the packaging and manufacturing of the sensor.
The utility model discloses in, step 1) is to place the grating position of bare fiber in the tubular furnace central point and keep 24h with constant temperature, treats that the temperature field is stable (reflection wavelength tends to stability) and then encapsulates the processing.
Preferably, the temperature of the tube furnace is measured directly by a thermocouple located in the vicinity of the grating, so that the temperature obtained is closer to the actual temperature.
Preferably, the first and second sensitized FBGs 201 and 202 are very close together, ensuring that they have the same annealing process at ambient temperature.
The utility model discloses in, step 2) encapsulates the protection with the bare fiber after the annealing, and the FBG position is encapsulated the protection by second insulation support 402, annular heat preservation heat insulation region 6, encapsulation shell sleeve pipe 3.
The utility model discloses in, step 2) is the thermal expansion effect that relies on the silicon rubber with the regional preparation of annular temperature sensing, acts on the third anchor end on right side, because do not fix between third encapsulation sleeve pipe and the third insulation support pipe, so the one end by the anchor of third anchor end has optic fibre axial degree of freedom on the optic fibre, so from the regional nearer second sensitization FBG202 of annular temperature sensing this effect of sensitively discernment to arouse the wavelength drift of second sensitization FBG 202.
The utility model discloses in, a method for manufacturing high accuracy FBG high temperature sensor, preferably, the silicon rubber that uses can keep good workability when 400 ℃, has better linear volume coefficient of thermal expansion. The silicone rubber has a coefficient of volumetric thermal expansion of (5.9-7.9). times.10-4/deg.C, and a coefficient of linear thermal expansion of about 1/3.
In the utility model, the used silicon rubber does not adopt a special process, and is the prior known technology.
The utility model discloses in, thickness insulation support's size is selected and can be synthesized according to the sensitivity of operating condition demand, FBG, the packing difficulty degree of silicon rubber and select.
The utility model discloses in, temperature measurement FBG202 is in the operating mode of temperature field and strain field coupling, is located left temperature compensation FBG201 and can be better with temperature and strain decoupling zero.
The utility model discloses in, because the sensor size is very little, so its integrated network deployment can become very feasible, the field that specially adapted needs high temperature sensing.
The utility model discloses in, outmost encapsulation is temperature compensation FBG encapsulation shell sleeve pipe 301, temperature measurement FBG encapsulation shell sleeve pipe 302, first heat preservation sleeve pipe 401 and direct insertion silicon rubber insulation cover intraductal anchor end third encapsulation shell sleeve pipe 303 in proper order.
The utility model discloses in, inferior outer encapsulation is high temperature resistant epoxy optic fibre anchor end 501, the heat preservation of first annular is thermal-insulated regional 601, high temperature resistant epoxy optic fibre anchor end 502, the heat preservation of second annular is thermal-insulated regional 602, high temperature resistant epoxy optic fibre insulation sleeve pipe anchor end 503, silicon rubber and hug closely the high temperature resistant epoxy optic fibre anchor end 504 of activity of silicon rubber in proper order.
The utility model discloses in, the encapsulation of inlayer is high temperature resistant epoxy optic fibre anchor end 501, second insulation support 402, high temperature resistant epoxy optic fibre anchor end 502, second insulation support 402, the high temperature resistant epoxy optic fibre anchor end 504 of activity in proper order.
The utility model discloses in, because silicon rubber has better high temperature resistance ability and better temperature sensitivity, when ambient temperature risees, corresponding thermal expansion phenomenon can take place for silicon rubber, and at this moment the silicon rubber after the inflation can be to an effort of third anchor end on right side, and this effect can be discerned comparatively sensitively by temperature measurement FBG 202.
The utility model discloses in, this FBG high temperature sensor further improves FBG temperature measurement threshold value to better feasibility has.
Example 1
Referring to fig. 1, a high-precision FBG high-temperature sensor comprises a bare fiber 2, long package casing sleeves (301, 302), a third package casing sleeve 303, a first heat-insulating sleeve 401, a second heat-insulating sleeve 402, a high-temperature-resistant epoxy anchoring end 5, an annular heat-insulating area 6 and silicon rubber. The optical fiber passes through the second heat-preservation sleeve 402, an annular heat-preservation and heat-insulation area 6 is filled outside the position of the grating, and the packaging shell sleeves (301 and 302) are arranged outside the annular heat-preservation and heat-insulation area.
One end of the temperature measurement FBG202 is anchored with one end of the temperature compensation FBG201, and the other end of the temperature measurement FBG passes through the silicon rubber temperature sensing area through the second heat insulation sleeve 402 and is anchored with the movable packaging shell sleeve 303.
The temperature sensing area is composed of a first heat insulation sleeve 401, a second heat insulation sleeve 402, silicon rubber and a third anchoring end 503. The innermost is the second insulating sleeve 402, the outer is silicon rubber, the outermost is the first insulating sleeve 401, and the right side is the third anchoring end 504, so that the resistance of the second insulating sleeve along the longitudinal direction of the sensor is mainly provided by the optical fiber. The temperature sensing area of the sensor
The temperature measurement FBG202 is connected with the packaging casing sleeve where the temperature measurement FBG202 is located through the heat insulation sleeve. The dimensions of the sensor are: the length is 150mm, the maximum outer diameter is 7mm, and the minimum outer diameter is 4 mm.
Example 2
A manufacturing method of a high-precision FBG high-temperature sensor only fixes FBG in a tube furnace, closes the tube furnace, and fills high-temperature cotton into two ends of the FBG to finish the annealing process.
Example 3
Example 2 was repeated except that the temperature measurement area and the temperature compensation area were connected by means of high temperature resistant epoxy, or spot welding could be used to connect the first package housing sleeve 301 to the second package housing sleeve 302.
Example 4
Example 3 was repeated, example 1 was repeated, except that the high temperature caused the silicone rubber to expand and act on the third anchoring end 504, the silicone rubber having dimensions of approximately: the length is 20mm, the outer diameter is 4mm, and the temperature measuring section FBG202 can accurately read the information.
Example 5
Example 4 was repeated except that the sensor further included an armored fiber having both ends accessed, the armored fiber including an inner cladding tube, a metal sleeve, and an outer sleeve. The three-layer ferrule protects the optical fiber from damage by corrosion, mechanical abrasion, shearing, and the like.
Example 6
And repeating the embodiment 5, connecting the fixed FBG high-temperature sensor with an optical fiber jumper, accessing a demodulator, and connecting the demodulator end with a computer terminal. The demodulator adopts a Si255 type manufactured by Micron Optics company in America, is configured with 16 channels, has a bandwidth of 160nm per channel, and is developed based on a new generation HYPERION platform. The computer adopts ENLIGHT sensing analysis and data acquisition software on a Windows7 operating system. And adjusting the temperature set value of the tubular furnace to 500 ℃, starting heating, and keeping the temperature for 2 hours when the temperature is 500 ℃. And calibrating the two FBGs at high temperature, and compensating the nonlinear influence of the temperature on the temperature measurement FBG by using the data of the temperature compensation FBG. The goodness of fit R2 of the two FBG data is greater than 0.9, and the standard of high-temperature monitoring is achieved.
Claims (6)
1. A high-precision FBG high-temperature sensor is characterized by comprising:
the optical fiber is positioned at the center of the sensor, and a first sensitization FBG for temperature compensation and a second sensitization FBG for temperature measurement are arranged on the optical fiber along the axial direction of the optical fiber;
the packaging shell sleeve is coaxially sleeved outside the optical fiber and comprises three sections, namely a first packaging shell sleeve sleeved at one end of the optical fiber and corresponding to the first sensitization FBG, a second packaging shell sleeve sleeved at the middle part of the optical fiber and corresponding to the second sensitization FBG, and a third packaging shell sleeve sleeved at the other end of the optical fiber;
the first anchoring end is arranged between the first packaging shell sleeve and the optical fiber and used for limiting one end of the optical fiber;
the second anchoring end is arranged between the second packaging shell sleeve and the two sensitivity enhancing FBGs on the optical fiber and is used for limiting the expansion and contraction of the first sensitivity enhancing FBG on the optical fiber;
the heat-insulating sleeve is used for insulating optical fibers and comprises a first heat-insulating sleeve, a second heat-insulating sleeve and a third heat-insulating sleeve, wherein,
the first heat-insulating sleeve is arranged inside the sensor and positioned between the first anchoring end and the second anchoring end;
the second insulation sleeve is arranged inside the sensor and positioned between the second anchoring end and the third anchoring end:
the third heat-insulating sleeve is arranged outside the packaging shell sleeve, the inner wall of one end of the third heat-insulating sleeve is fixedly connected with the outer wall of the second packaging shell sleeve in a sealing way, and the inner wall of the other end of the third heat-insulating sleeve is fixedly connected with the outer wall of the third packaging shell sleeve in a sealing way;
the third anchoring end is used for limiting the other end of the optical fiber, the whole third anchoring end is cured and molded in a third packaging sleeve, and the third packaging sleeve is sleeved with the third heat-insulating sleeve;
the fourth anchoring end is arranged between the second heat-insulation sleeve and the second packaging shell sleeve;
a first annular heat-preservation area is formed in the sensor by enclosing the first anchoring end, the second anchoring end, the first heat-preservation sleeve and the first packaging shell sleeve;
the second anchoring end, the fourth anchoring end, the second heat-insulation sleeve and the second packaging shell sleeve are enclosed to form a second annular heat-insulation area;
the first annular heat-preservation area and the second annular heat-preservation area are filled with heat-preservation and heat-insulation materials;
an annular temperature sensing area is formed in the sensor by enclosing the fourth anchoring end, the third anchoring end, the second heat insulation sleeve and the third heat insulation sleeve, and high-temperature linear expansion materials are filled in the annular temperature sensing area.
2. The high-precision FBG high-temperature sensor as claimed in claim 1, wherein the high-temperature linear expansion material is silicone rubber or fluoro rubber.
3. The FBG high-temperature sensor as claimed in claim 1, wherein the thermal insulation material is powdered silica fume with refractoriness>The density reaches (1.6-1.7) g/cm at 1600 DEG C3More than 80% of the particles with fineness less than 1 μm, average particle diameter of 0.1-0.3 μm, and specific surface area of 20-28 m2/g。
4. The high-precision FBG high-temperature sensor as claimed in claim 1, wherein the length of the sensor is 100-300mm and the diameter is 4-15 mm.
5. A high-precision FBG high-temperature sensor according to claim 1, wherein: the packaging shell sleeve is made of a material with high thermal conductivity.
6. A high-precision FBG high-temperature sensor according to claim 1, wherein: the third heat-insulating sleeve is made of carbon fiber materials.
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Address after: 411105 Hunan Province, Xiangtan City Yuhu fools Tong Street Xiangtan University Patentee after: XIANGTAN University Patentee after: SOUTHEAST University Patentee after: Jiangsu menglianqiao Technology Co.,Ltd. Patentee after: SHANDONG INSTITUTE OF SPACE ELECTRONIC TECHNOLOGY Patentee after: Nanjing MAIYUE Material Technology Co.,Ltd. Address before: 411105 Hunan Province, Xiangtan City Yuhu fools Tong Street Xiangtan University Patentee before: XIANGTAN University Patentee before: SOUTHEAST University Patentee before: NANJING MENGLIANQIAO SENSING TECHNOLOGY Co.,Ltd. Patentee before: SHANDONG INSTITUTE OF SPACE ELECTRONIC TECHNOLOGY Patentee before: Nanjing menglianqiao Material Technology Co.,Ltd. |