CN113155163A - Optical fiber temperature and pressure sensor based on double-capillary packaging - Google Patents
Optical fiber temperature and pressure sensor based on double-capillary packaging Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35338—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using other arrangements than interferometer arrangements
- G01D5/35354—Sensor working in reflection
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/3537—Optical fibre sensor using a particular arrangement of the optical fibre itself
- G01D5/3538—Optical fibre sensor using a particular arrangement of the optical fibre itself using a particular type of fiber, e.g. fibre with several cores, PANDA fiber, fiber with an elliptic core or the like
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/36—Forming the light into pulses
- G01D5/38—Forming the light into pulses by diffraction gratings
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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
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
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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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
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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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02295—Microstructured optical fibre
- G02B6/02314—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes
- G02B6/02319—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes characterised by core or core-cladding interface features
- G02B6/02323—Core having lower refractive index than cladding, e.g. photonic band gap guiding
- G02B6/02328—Hollow or gas filled core
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- Physics & Mathematics (AREA)
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- Optics & Photonics (AREA)
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Abstract
The utility model provides a based on two capillary encapsulation optic fibre temperature pressure sensor, it has single mode fiber to seal the encapsulation with high temperature glue in the first capillary glass pipe, first heat regeneration grating has been carved with on the fibre core of single mode fiber, single mode fiber both ends stretch out the first capillary glass outside of tubes, wherein one end butt fusion has photonic crystal optic fibre, the cover is equipped with second capillary glass pipe on the photonic crystal optic fibre, it has second heat regeneration grating to be located to carve on the photonic crystal optic fibre core in the second capillary glass pipe, the one end cover that first capillary glass pipe is close to photonic crystal optic fibre inlays in the second capillary glass pipe, it seals fixedly with high temperature glue between first capillary glass pipe and the second capillary glass pipe. The invention overcomes the limitation that the traditional electricity measurement mode needs to be respectively measured and cannot accurately measure in a high-temperature environment for a long time, and has the advantages of smaller volume and more suitability for monitoring in a sealed narrow structural element.
Description
Technical Field
The invention belongs to the technical field of optical fiber sensing, and particularly relates to an optical fiber temperature and pressure sensor based on double capillary tube packaging.
Background
An engine is a machine capable of converting other forms of energy into mechanical energy, and is applicable to both power generation devices and whole machines including power devices (e.g., gasoline engines and aircraft engines). Taking an aircraft engine as an example, when the aircraft engine works, the interior of the aircraft engine usually comprises high temperature and high pressure, and is accompanied by high load and high rotating speed and severe vibration, and the aircraft engine is comprehensive system engineering related to multiple disciplines, so that great design and manufacturing difficulty is caused. Along with the development of the engine towards high thrust-weight ratio, high bypass ratio and high turbine inlet temperature, the working temperature of the hot end part of the engine is higher and higher, the surface temperature of the engine body of the engine is 50-600 ℃, and the gas temperature in the combustion chamber is over 1650 ℃. As is known, determining the degree of thermal change and abnormal overheating of an object to be detected in the actual operation process is often an important basis for judging the reliability and the actual working performance of the object to be detected. During the design and manufacturing process of each component of the engine, long-time running tests exist, and the engine runs in different extremely high-temperature and high-pressure environments with flammable and explosive risks, so that the detection and monitoring of equipment in the production process are very necessary.
Disclosure of Invention
The invention aims to solve the technical problem of providing the optical fiber temperature and pressure sensor based on the double-capillary tube packaging, which has the advantages of reasonable design, simple structure and small volume, and can continuously and accurately distinguish the measured temperature and the measured pressure in a high-temperature pressure environment for a long time.
The technical scheme for solving the technical problems is as follows: the utility model provides a based on two capillary encapsulation optic fibre temperature pressure sensor, it has single mode fiber to seal the encapsulation with high temperature glue in the first capillary glass pipe, first heat regeneration grating has been carved with on the fibre core of single mode fiber, single mode fiber both ends stretch out the first capillary glass outside of tubes, wherein one end butt fusion has photonic crystal optic fibre, the cover is equipped with second capillary glass pipe on the photonic crystal optic fibre, it has second heat regeneration grating to be located to carve on the photonic crystal optic fibre core in the second capillary glass pipe, the one end cover that first capillary glass pipe is close to photonic crystal optic fibre inlays in the second capillary glass pipe, it seals fixedly with high temperature glue between first capillary glass pipe and the second capillary glass pipe.
As a preferable technical scheme, the lengths of the grid regions of the first thermal regeneration grating and the second thermal regeneration grating are equal, the distance between the two grid regions is 2-3 cm, and the central wavelength of the first thermal regeneration grating is larger than that of the second thermal regeneration grating.
As a preferable technical scheme, the length of a grid region of the first thermal regeneration grating is 5-15 mm, the central wavelength is 1533-1573 nm, and the difference between the central wavelength of the first thermal regeneration grating and the central wavelength of the second thermal regeneration grating is 3-10 nm.
Preferably, the difference between the outer diameter of the first capillary glass tube and the inner diameter of the second capillary glass tube is 40 to 60 μm.
As a preferable technical scheme, the length of the first capillary glass tube is 1-3 cm, the inner diameter is 150-200 μm, the outer diameter is 258-300 μm, the length of the second capillary glass tube is 2-4 cm, the inner diameter is 318-368 μm, and the outer diameter is 449-499 μm.
As a preferable technical solution, the first capillary glass tube and the second capillary glass tube are both quartz capillary glass tubes or borosilicate glass capillary tubes.
As a preferable technical solution, the first capillary glass tube and the second capillary glass tube may also be sapphire crystal capillary tubes.
As a preferable technical solution, the photonic crystal fiber is a grapefruit type photonic crystal fiber, the diameter of the cladding of the grapefruit type photonic crystal fiber is 125 μm, the fiber core is an irregular hexagon, the distance between the centers of two adjacent pores, which are surrounded by 6 uniformly distributed pores a, is 7.7 μm, the transverse pore diameter of the pores is 19.7 μm, and the longitudinal pore diameter is 15 μm.
As a preferred technical solution, the single mode fiber is a silica fiber.
As a preferred technical solution, the single mode fiber may also be a sapphire fiber or a photonic crystal fiber.
The invention has the following beneficial effects:
the invention locates the first heat regeneration fiber grating on the single mode fiber in the first capillary glass tube, the second heat regeneration fiber grating on the photon crystal fiber in the second capillary glass tube, and the first capillary glass tube and the second capillary glass tube are sealed and fixed by high temperature ceramic glue. The invention overcomes the limitation that the traditional electricity measurement mode needs to be respectively measured and cannot accurately measure in a high-temperature environment for a long time, and has the advantages of smaller volume and more suitability for monitoring in a sealed narrow structural element.
Drawings
Fig. 1 is a schematic structural view of the present invention.
FIG. 2 shows the reflection spectrum of example 1 of the present invention at 0-900 ℃.
FIG. 3 is a graph of wavelength versus intensity for a pressure test conducted at 800 ℃ in example 1 of the present invention.
FIG. 4 is a graph of the wavelength versus pressure at 800 ℃ for example 1 of the present invention.
Detailed Description
The present invention will be described in further detail below with reference to the drawings and examples, but the present invention is not limited to the embodiments described below.
Example 1
In fig. 1, a double capillary tube package-based optical fiber temperature and pressure sensor according to the present embodiment is formed by connecting a first capillary glass tube 1, a single mode fiber 2, a second capillary glass tube 3, and a photonic crystal fiber 4.
The length of a first capillary glass tube 1 is 2cm, the inner diameter is 170 mu m, the outer diameter is 270 mu m, a single-mode optical fiber 2 is hermetically packaged in the first capillary glass tube 1 by high-temperature ceramic glue, the single-mode optical fiber 2 is a quartz optical fiber, a first thermal regeneration grating 5 is engraved on the fiber core of the single-mode optical fiber 2, the length of a grid region of the first thermal regeneration grating 5 is 10mm, the central wavelength is 1553nm, the left end and the right end of the single-mode optical fiber 2 extend out of the first capillary glass tube 1, the right end of the single-mode optical fiber 2 is welded with a photonic crystal optical fiber 4, the photonic crystal optical fiber 4 is a shaddock-type photonic crystal optical fiber 4, the diameter of a cladding of the shaddock-type photonic crystal optical fiber 4 is 125 mu m, the fiber core is an irregular hexagon, 6 uniformly distributed air holes a are wound around the fiber core, the hole center distance between two adjacent air holes a is 7.7 mu m, the transverse aperture of the air holes a is 19.7 mu m, the longitudinal aperture is 15 mu m, a second capillary glass tube 3 is sleeved on the photonic crystal optical fiber 4, the length of the second capillary glass tube 3 is 3cm, the inner diameter is 330 μm, the outer diameter is 479 μm, a fiber core of the photonic crystal fiber 4 in the second capillary glass tube 3 is engraved with a second thermal regeneration grating 6, the length of the second thermal regeneration grating 6 is equal to that of a grid region of the first thermal regeneration grating 5, the distance between the two grid regions is 2.5cm, the central wavelength of the second thermal regeneration grating 6 is 1547nm, one end of the first capillary glass tube 1 close to the photonic crystal fiber 4 is sleeved and embedded in the second capillary glass tube 3, and the first capillary glass tube 1 and the second capillary glass tube 3 are sealed and fixed by high-temperature ceramic glue. Because the first heat regeneration fiber grating is positioned on the single mode fiber 2 in the first capillary glass tube 1, the second heat regeneration fiber grating is positioned on the photonic crystal fiber 4 in the second capillary glass tube 3, and the first capillary glass tube 1 and the second capillary glass tube 3 are sealed and fixed by high-temperature ceramic glue, when the fiber grating temperature-pressure differential measurement device is positioned in a temperature-pressure environment, the first heat regeneration fiber grating can only be influenced by temperature, the second heat regeneration fiber grating can be simultaneously influenced by temperature and pressure, and the temperature and pressure are respectively calculated by the dual-wavelength matrix, so that the temperature-pressure differential measurement is realized.
Example 2
In this embodiment, the first capillary glass tube 1 has a length of 1cm, an inner diameter of 150 μm, and an outer diameter of 258 μm, the first capillary glass tube 1 is a silica capillary glass tube, and may also be a borosilicate glass capillary tube, the single-mode fiber 2 is hermetically sealed and packaged in the first capillary glass tube 1 by using a high-temperature ceramic adhesive, the single-mode fiber 2 is a silica fiber, the core of the single-mode fiber 2 is inscribed with a first thermal regeneration grating 5, the length of the grating region of the first thermal regeneration grating 5 is 5mm, the central wavelength is 1533nm, the left and right ends of the single-mode fiber 2 extend out of the first capillary glass tube 1, the right end of the single-mode fiber 2 is welded with a photonic crystal fiber 4, the photonic crystal fiber 4 is a grapefruit-type photonic crystal fiber 4, the photonic crystal fiber 4 is sheathed with a second capillary glass tube 3, the length of the second capillary glass tube 3 is 2cm, the inner diameter is 318 μm, the outer diameter is 449 μm, the second capillary glass tube 3 is a capillary glass tube, the fiber can also be a borosilicate glass capillary, a second thermal regeneration grating 6 is engraved on the fiber core of the photonic crystal fiber 4 in the second capillary glass tube 3, the length of the second thermal regeneration grating 6 is equal to that of the gate region of the first thermal regeneration grating 5, the distance between the two gate regions is 2cm, the central wavelength of the second thermal regeneration grating 6 is 1530nm, one end of the first capillary glass tube 1 close to the photonic crystal fiber 4 is sleeved and embedded in the second capillary glass tube 3, and the first capillary glass tube 1 and the second capillary glass tube 3 are sealed and fixed by high-temperature ceramic glue. The other components and the connection relationship of the components are the same as those in embodiment 1.
Example 3
In the embodiment, the length of the first capillary glass tube 1 is 3cm, the inner diameter is 200 μm, and the outer diameter is 300 μm, the single-mode fiber 2 is hermetically packaged in the first capillary glass tube 1 by using high-temperature ceramic glue, the single-mode fiber 2 is a quartz fiber, the core of the single-mode fiber 2 is engraved with a first thermal regeneration grating 5, the length of the grating region of the first thermal regeneration grating 5 is 15mm, the central wavelength is 1573nm, the left and right ends of the single-mode fiber 2 extend out of the first capillary glass tube 1, the right end of the single-mode fiber 2 is welded with a photonic crystal fiber 4, the photonic crystal fiber 4 is a grapefruit-type photonic crystal fiber 4, the photonic crystal fiber 4 is sleeved with a second capillary glass tube 3, the length of the second capillary glass tube 3 is 4cm, the inner diameter is 360 μm, and the outer diameter is 499 μm, the core of the photonic crystal fiber 4 in the second capillary glass tube 3 is engraved with a second thermal regeneration grating 6, the lengths of the grid regions of the second thermal regeneration grating 6 and the first thermal regeneration grating 5 are equal, the distance between the two grid regions is 3cm, the central wavelength of the second thermal regeneration grating 6 is 1563nm, one end of the first capillary glass tube 1 close to the photonic crystal fiber 4 is sleeved and embedded in the second capillary glass tube 3, and the first capillary glass tube 1 and the second capillary glass tube 3 are sealed and fixed by high-temperature ceramic cement. The other components and the connection relationship of the components are the same as those in embodiment 1.
Example 4
In the above embodiments 1 to 3, the first capillary glass tube 1 and the second capillary glass tube 3 were replaced with sapphire crystal capillaries, and the single-mode optical fiber 2 was replaced with a sapphire optical fiber or a photonic crystal optical fiber 4. Other components and the connection relationship of the components are the same as those of the corresponding embodiment.
The working principle of the invention is as follows:
the thermal regeneration grating temperature sensing mechanism is as follows: the wavelength drift of the thermal regeneration grating can be influenced by temperature change, the drift generated by the central wavelength of the thermal regeneration grating is influenced by effective refractive index and the period of the thermal regeneration grating, and when the external uniform pressure and the axial stress field are kept constant, the thermal expansion effect caused by the period change of the thermal regeneration grating can be obtained as follows:
ΔΛ＝α·Λ·ΔT (1)
in the formula, delta lambda is the period variation of the thermal regeneration grating, alpha is the thermal expansion coefficient of the optical fiber, lambda is the period of the thermal regeneration grating, and delta T is the temperature variation;
the effective refractive index change due to the thermo-optic effect is:
Δneff＝ξ·neff·ΔT (2)
in the formula, DELTA neffIs the rate of change of the effective refractive index of the fiber core with temperature, xi is the thermo-optic coefficient of the fiber, neffThe effective index of the core, therefore, the total wavelength shift of the temperature versus thermally regenerated grating is:
in the formula, delta lambdaBIs the amount of drift, λ, of the center wavelength of the thermally regenerated gratingBIs the central wavelength of the thermal regeneration grating;
temperature sensitivity coefficient K of thermal regeneration gratingTComprises the following steps:
when the temperature change is not too great, it is generally considered that ξ is a constant whose relationship is
ΔλB＝KT·λB·ΔT (5)
The heat regeneration grating pressure sensing mechanism is as follows: when the thermal regeneration grating is under the action of radial pressure, the thermal regeneration grating can generate positive axial strain, the period of the thermal regeneration grating is changed, and the change of the central wavelength of the thermal regeneration grating caused by the axial strain is as follows:
in the formula P11Is the elasto-optic coefficient, P, of a single mode optical fibre12Is the elastic-optical coefficient of the photonic crystal fiber, v is the Poisson's ratio of the fiber core material, neffIs the effective refractive index of the core, PeIs the effective elasto-optic coefficient.
To verify the beneficial effects of the present invention, the dual capillary tube encapsulation based optical fiber temperature and pressure sensor of example 1 was subjected to a pressure test at 800 ℃ environment:
the single-mode fiber left end based on the double-capillary tube packaged fiber temperature and pressure sensor is connected with one end of an SM125 optical demodulator, broadband light emitted by the SM125 optical demodulator enters from the single-mode fiber left end and is transmitted to the SM125 optical demodulator from the single-mode fiber left end after being reflected by a first thermal regeneration grating and a second thermal regeneration grating, the SM125 optical demodulator demodulates the received reflected broadband light into a reflected spectrum curve of the reflected broadband light, and in the embodiment 1, the reflection spectrum of the double-capillary tube packaged fiber temperature and pressure sensor is 0-900 ℃, as shown in fig. 2.
When the pressure and the temperature of the external environment change simultaneously, the wavelength shifts of the first thermal regeneration grating 5 and the second thermal regeneration grating 6 are respectively:
Δλ1＝k1T·ΔT+k1P·ΔP (8)
Δλ2＝k2T·ΔT+k2p·ΔP (9)
in the formula, delta lambda1For the wavelength shift, Δ λ, of the first thermally regenerative grating 52For the wavelength drift of the first thermal regeneration grating 5, Δ P is the pressure change amount, Δ T is the temperature change amount, k1TIs the temperature sensitivity, k, of the first thermally regenerative grating 52TIs the temperature sensitivity, k, of the second thermally regenerative grating 61pIs the pressure sensitivity, k, of the first thermal regeneration grating 52pThe pressure sensitivity of the second thermal regeneration grating 6;
the coefficient matrix for temperature compensation is:
since the first thermal regeneration grating 5 is isolated from the influence of pressure, k1P＝0。
Results and analysis of the experiments
FIG. 2 shows the pressure test of the sensor structure after thermal regeneration at 800 deg.C, wherein the left peak is the first thermal regeneration grating protected by capillary glass tube and high temperature glue, because the capillary glass tube and the high-temperature glue are used for isolating pressure, the reflection peak is only slightly disturbed by the temperature of the testing environment, the peak remains substantially unchanged, whereas, in contrast, the right peak is a second thermally regenerative grating unprotected by the capillary glass tube, the drift towards the short wavelength direction is kept under the pressure test of 0-5MPa, and the pressure sensitivity of the structure of the embodiment 1 of the invention is 165.9pm/MPa under the environment of 800 ℃ through the fitting of figure 3, the corresponding temperature sensitivity is obtained by measuring the drift of the first thermal regeneration grating wave crest and the second thermal regeneration grating wave crest at different temperatures, and the corresponding temperature sensitivity is substituted into the formula (10), so that the corresponding temperature pressure at the moment can be obtained.
Because the sensor is limited by the high-temperature ceramic adhesive, the temperature response range changes along with the lowest tolerance temperature of the high-temperature ceramic adhesive, and the structure of the type can refer to a temperature pressure test method at 1000 ℃ at different temperatures, so that the pressure at different temperatures can be accurately measured.
Claims (10)
1. The utility model provides a based on two capillary encapsulation optic fibre temperature pressure sensor which characterized in that: the single-mode optical fiber (2) is sealed and packaged in the first capillary glass tube (1) through high-temperature glue, a first thermal regeneration grating (5) is inscribed on the fiber core of the single-mode optical fiber (2), two ends of the single-mode optical fiber (2) extend out of the first capillary glass tube (1), one end of the single-mode optical fiber is welded with a photonic crystal fiber (4), the photonic crystal fiber (4) is sleeved with a second capillary glass tube (3), a second thermal regeneration grating (6) is inscribed on the fiber core of the photonic crystal fiber (4) in the second capillary glass tube (3), one end, close to the photonic crystal fiber (4), of the first capillary glass tube (1) is embedded in the second capillary glass tube (3), and the first capillary glass tube (1) and the second capillary glass tube (3) are sealed and fixed through high-temperature glue.
2. The dual capillary based packaged fiber optic temperature and pressure sensor of claim 1, wherein: the lengths of the grid regions of the first thermal regeneration grating (5) and the second thermal regeneration grating (6) are equal, the distance between the two grid regions is 2-3 cm, and the central wavelength of the first thermal regeneration grating (5) is larger than that of the second thermal regeneration grating (6).
3. The dual capillary based packaged fiber optic temperature and pressure sensor of claim 2, wherein: the grating region length of the first thermal regeneration grating (5) is 5-15 mm, the central wavelength is 1533-1573 nm, and the difference between the central wavelength of the first thermal regeneration grating (5) and the central wavelength of the second thermal regeneration grating (6) is 3-10 nm.
4. The dual capillary based packaged fiber optic temperature and pressure sensor of claim 1, wherein: the difference between the outer diameter of the first capillary glass tube (1) and the inner diameter of the second capillary glass tube (3) is 40-60 μm.
5. The dual capillary based packaged fiber optic temperature and pressure sensor of claim 1 or 4, wherein: the first capillary glass tube (1) is 1-3 cm long, 150-200 mu m in inner diameter and 258-300 mu m in outer diameter, and the second capillary glass tube (3) is 2-4 cm long, 318-368 mu m in inner diameter and 449-499 mu m in outer diameter.
6. The dual capillary based packaged fiber optic temperature and pressure sensor of claim 1 or 4, wherein: the first capillary glass tube (1) and the second capillary glass tube (3) are both quartz capillary glass tubes or borosilicate glass capillary tubes.
7. The dual capillary based packaged fiber optic temperature and pressure sensor of claim 6, wherein: the first capillary glass tube (1) and the second capillary glass tube (3) can also be sapphire crystal capillaries.
8. The dual capillary based packaged fiber optic temperature and pressure sensor of claim 1, wherein: the photonic crystal fiber (4) is a grapefruit type photonic crystal fiber, the diameter of a cladding of the grapefruit type photonic crystal fiber is 125 micrometers, a fiber core is an irregular hexagon, 6 uniformly distributed air holes (a) are surrounded around the fiber core, the hole center distance between every two adjacent air holes is 7.7 micrometers, the transverse aperture of each air hole is 19.7 micrometers, and the longitudinal aperture of each air hole is 15 micrometers.
9. The dual capillary based packaged fiber optic temperature and pressure sensor of claim 1, wherein: the single-mode optical fiber (2) is a quartz optical fiber.
10. The dual capillary based packaged fiber optic temperature and pressure sensor of claim 1, wherein: the single-mode fiber (2) can also be a sapphire fiber or a photonic crystal fiber.
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| CN114544070A (en) * | 2022-01-11 | 2022-05-27 | 北京航空航天大学 | Photonic crystal fiber pressure sensor based on double-layer capillary and manufacturing method thereof |
| CN116256861A (en) * | 2023-05-09 | 2023-06-13 | 山东省科学院激光研究所 | Optical fiber F-P cavity temperature sensor and packaging protection structure |
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