CN213902404U - Double-sleeve packaged optical fiber high-temperature pressure sensor - Google Patents
Double-sleeve packaged optical fiber high-temperature pressure sensor Download PDFInfo
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- CN213902404U CN213902404U CN202022933094.1U CN202022933094U CN213902404U CN 213902404 U CN213902404 U CN 213902404U CN 202022933094 U CN202022933094 U CN 202022933094U CN 213902404 U CN213902404 U CN 213902404U
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Abstract
A capillary glass tube is arranged in a corundum tube, the length of the corundum tube is larger than that of the capillary glass tube, a single-mode optical fiber is arranged in the capillary glass tube, a thermal regeneration grating is inscribed on the single-mode optical fiber in the capillary glass tube, one end of the single-mode optical fiber extends out of the capillary glass tube, a multimode optical fiber, a hollow optical fiber and a photonic crystal optical fiber are sequentially spliced at the end part of the single-mode optical fiber, the central lines of the single-mode optical fiber, the multimode optical fiber, the hollow optical fiber and the photonic crystal optical fiber are overlapped, and a spliced body formed by the multimode optical fiber, the hollow optical fiber and the photonic crystal optical fiber is suspended in the corundum tube. The utility model has the advantages of low cost, simple manufacture, high temperature resistance and high sensitivity, solves the problem of temperature-pressure differentiation measurement in high-temperature environment, and can be applied to pressure monitoring in high-temperature environment.
Description
Technical Field
The utility model belongs to the technical field of optical fiber sensor, concretely relates to optic fibre high temperature pressure sensor of double cannula encapsulation.
Background
With the development of aviation propulsion technology, computing technology and electronic computer application technology, people establish more complex design and analysis methods to accelerate the development process of aviation propulsion technology systems, and the engineering design and analysis methods need more and more precise test data to verify and confirm, so that higher and higher requirements are put forward on engine testing. The real-time monitoring of the operation condition of each component of the aircraft engine in the actual operation process is often an important basis for judging the safety, reliability and actual working performance of the engine. The optical fiber high-temperature pressure sensor is a pressure monitoring sensor, and compared with other technologies, the optical fiber sensor has incomparable advantages. The optical fiber is a non-electrical conductor and is suitable for the environment of electromagnetic interference; the optical fiber is made of silicon dioxide and is suitable for high-temperature environment; the optical fiber measurement can realize non-contact measurement, is suitable for being installed on the surface of a structure or embedded in the structure, has small influence on the measured structure, and reflects the measurement result more truly; the optical fiber has small volume and light weight and is convenient to install; the optical fiber sensor has the characteristics of high temperature and pressure response speed, good temperature and pressure measurement linearity and the like. In recent years, with the development of optical fiber technology, aiming at the characteristic that the requirement of an aircraft engine on the measurement precision, the response speed and the like of a sensor is high, the application of the optical fiber high-temperature pressure sensor to the monitoring of the temperature and the pressure of the aircraft engine has far-reaching significance to the development of the aircraft engine.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that an optic fibre high temperature pressure sensor of double cannula encapsulation that reasonable in design, simple manufacture, high temperature resistant, sensitivity are high supplies.
The technical scheme for solving the technical problems is as follows: a capillary glass tube is arranged in the corundum tube, the length of the corundum tube is larger than that of the capillary glass tube, a single-mode optical fiber is arranged in the capillary glass tube, a thermal regeneration grating is inscribed on the single-mode optical fiber in the capillary glass tube, one end of the single-mode optical fiber extends out of the capillary glass tube and is sequentially spliced with a multi-mode optical fiber, a hollow optical fiber and a photonic crystal optical fiber at the end, the central lines of the single-mode optical fiber, the multi-mode optical fiber, the hollow optical fiber and the photonic crystal optical fiber are overlapped, and a spliced body formed by the multi-mode optical fiber, the hollow optical fiber and the photonic crystal optical fiber is suspended in the corundum tube.
As a preferable technical scheme, the outer diameters of the single-mode optical fiber, the multi-mode optical fiber, the hollow optical fiber and the photonic crystal optical fiber are the same and are 110-130 mu m.
As a preferable technical scheme, the diameter of the single-mode optical fiber core is 8.2 microns, the inner diameter of the hollow optical fiber is 75 microns to 100 microns, and the diameter of the multimode optical fiber core is 50 microns to 105 microns.
As a preferred technical scheme, the end face of the photonic crystal fiber is an inclined plane.
As a preferred technical scheme, the photonic crystal fiber is a grapefruit type photonic crystal fiber or a panda type photonic crystal fiber.
As a preferable technical scheme, the length of a grid region of the thermal regeneration grating is 5-15 mm, and the central wavelength is 1553 nm.
In a preferred embodiment, the capillary glass tube has an inner diameter of 150 to 200 μm and an outer diameter of 300 to 400 μm.
As a preferable technical proposal, the inner diameter of the corundum tube is 400 to 500 μm, and the outer diameter is 600 to 800 μm.
As a preferable technical scheme, the corundum tube can also be a sapphire tube.
As a preferable technical scheme, the corundum tube and the capillary glass tube are fixed through high-temperature-resistant glue, and the capillary glass tube and the single-mode optical fiber are fixed through high-temperature-resistant glue.
The utility model has the advantages as follows:
the utility model discloses glue the encapsulation at capillary glass intraductal through the high temperature with single mode fiber, multimode fiber plays and to the collimation of light path effect, and the one end and multimode fiber concatenation, the other end of hollow optic fibre and the concatenation of photonic crystal optic fibre form the cavity is interfered to the Fabry-Perot in hollow optic fibre, and alundum pipe one end glues the bonding through the high temperature with capillary glass manages optic fibre for protect whole sensor structure. The utility model has the advantages of low cost, simple manufacture, high temperature resistance and high sensitivity, solves the problem of temperature-pressure differentiation measurement in high-temperature environment, and can be applied to pressure monitoring in high-temperature environment.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a graph of the reflection spectrum at room temperature according to the present invention.
Fig. 3 is a temperature response graph of a fiber optic high temperature pressure sensor of example 1 in a double-cannula package.
Fig. 4 is a graph of the 100 ℃ pressure response of the double-cannula packaged fiber optic high temperature pressure sensor of example 1.
Fig. 5 is a graph of the 500 c pressure response of the double-cannula packaged fiber optic high temperature pressure sensor of example 1.
Fig. 6 is a 1000 ℃ pressure response graph of the double-cannula packaged fiber optic high temperature pressure sensor of example 1.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, but the present invention is not limited to the following embodiments.
Example 1
In fig. 1, the optical fiber high-temperature pressure sensor packaged by the double-sleeve of the present embodiment is formed by connecting a corundum tube 1, a capillary glass tube 2, a single-mode optical fiber 3, a multi-mode optical fiber 5, a hollow optical fiber 6, and a photonic crystal optical fiber 7.
The internal diameter of a corundum tube 1 is 450 mu m, the external diameter is 700 mu m, a capillary glass tube 2 is fixedly arranged in the corundum tube 1 by using high-temperature glue, the length of the corundum tube 1 is greater than that of the capillary glass tube 2, the internal diameter of the capillary glass tube 2 is 180 mu m, the external diameter is 350 mu m, a single-mode optical fiber 3 is fixedly arranged in the capillary glass tube 2 by using high-temperature glue, a thermal regeneration grating 4 is engraved on the single-mode optical fiber 3 in the capillary glass tube 2, the grid region length of the thermal regeneration grating 4 is 10mm, the central wavelength is 1553nm, the capillary glass tube 2 is used for isolating the influence of air pressure on the thermal regeneration grating 4 and protecting the thermal regeneration grating 4, one end of the single-mode optical fiber 3 extends out of the capillary tube 2 and is sequentially welded with a multimode optical fiber 5, a hollow optical fiber 6 and a photonic crystal optical fiber 7, the photonic crystal optical fiber 7 is a shaddock type photonic crystal optical fiber, the multimode optical fiber 5, the hollow optical fiber 6, the photonic crystal optical fiber 7, The splicing body formed by the photonic crystal fiber 7 is suspended in the corundum tube 1, the inner cavity of the hollow fiber 6 is a Fabry-Perot interference cavity, the central lines of the single-mode fiber 3, the multimode fiber 5, the hollow fiber 6 and the photonic crystal fiber 7 are coincident, the outer diameters of the central lines are the same and 125 micrometers, the fiber core diameter of the single-mode fiber 3 is 8.2 micrometers, the fiber core diameter of the multimode fiber 5 is 100 micrometers, the inner diameter of the hollow fiber 6 is 85 micrometers, the multimode fiber 5 is used for collimating an optical path, the end face of the photonic crystal fiber 7 is an inclined face and used for preventing reflected light of the end face from reflecting back to the regenerative grating 4, the photonic crystal fiber 7 is used for guiding gas, and the corundum tube 1 is used for protecting the whole sensor.
The working principle of the utility model is as follows:
light enters from the single-mode fiber 3, is reflected on the end face of the left end of the photonic crystal through the thermal regeneration grating 4, the multimode fiber 5 and the hollow fiber, one part of incident light returns through the reflection original path of the thermal regeneration grating 4, the other part of the incident light is transmitted on two end faces of the Fabry-Perot interference cavity through the thermal regeneration grating 4, because the left end face of the photonic crystal fiber 7 is obliquely cut, the reflected light of the end face can not be reflected back to the regenerative grating 4, the interference spectrum is not influenced, and the light transmitted in the Fabry-Perot interference cavity is reflected by the left end face of the hollow optical fiber 6 and the right end face of the photonic crystal optical fiber 7 to form two beams of reflected light which are mutually interfered and return to the thermal regeneration grating 4, because the capillary glass tube 2 is sleeved outside the thermal regeneration grating 4 and sealed by high-temperature glue, the pressure can not act on the thermal regeneration grating 4, and obtaining parameters of pressure and temperature according to the drift inversion of the wavelength of the interference spectrum and the transmission spectrum of the thermal regeneration grating 4.
Because the fabry-perot interferes the chamber and is sensitive to temperature, pressure, and encapsulates the thermal regeneration grating 4 in capillary glass pipe 2 higher to the temperature responsivity, to the pressure nonresponsiveness, so the 4 pressure sensitivity of thermal regeneration grating is 0, consequently the utility model discloses the structure can utilize sensitivity coefficient matrix to realize high sensitivity pressure measurement and temperature compensation.
When the pressure and the temperature of the external environment change simultaneously, the wavelength drifts of the fabry-perot interference cavity and the thermal regeneration grating 4 are respectively as follows:
ΔλFP＝SP·ΔP+ST·ΔT
ΔλRFBG＝bPi·ΔP+αi·ΔT
where Δ P is the actual total variation of pressure, Δ T is the actual total variation of temperature, and Δ λFPIs the wavelength shift, Delta lambda, of a Fabry-Perot interferometric cavityRFBGFor thermal regeneration of the wavelength shift, S, of the grating 4PAnd bPiPressure sensitivity of the Fabry-Perot interference cavity and the thermal regeneration grating 4, respectively, in this formula bPiIs 0, STAnd alphaiThe temperature sensitivities of the fabry-perot interferometric cavity and the thermally regenerative grating 4, respectively.
The coefficient matrix for temperature compensation is:
combining formula T ═ T0+ΔT,T0The temperature of the environment in which the optical fiber sensor is located can be accurately derived for the initial ambient temperature.
Combined formula P ═ P0+ΔP,P0The temperature of the environment in which the optical fiber sensor is located can be accurately derived for the initial ambient temperature. The utility model discloses realize distinguishing measurement temperature pressure parameter simultaneously under 0 ~ 1000 ℃ temperature.
Example 2
In this embodiment, the inner diameter of the corundum tube 1 is 400 μm, the outer diameter is 600 μm, the inside of the corundum tube 1 is fixedly provided with the capillary glass tube 2 by high temperature glue, the length of the corundum tube 1 is greater than the length of the capillary glass tube 2, the inner diameter of the capillary glass tube 2 is 150 μm, the outer diameter is 300 μm, the inside of the capillary glass tube 2 is fixedly provided with the single mode fiber 3 by high temperature glue, the single mode fiber 3 is positioned in the capillary glass tube 2 and is inscribed with a thermal regeneration grating, the gate region length of the thermal regeneration grating 4 is 5mm, the central wavelength is 1553nm, the capillary glass tube 2 is used for isolating the influence of air pressure on the thermal regeneration grating 4 and protecting the thermal regeneration grating 4, one end of the single mode fiber 3 extends out of the capillary glass tube 2 and is sequentially welded with the multimode fiber 5, the hollow fiber 6 and the photonic crystal fiber 7, the photonic crystal fiber 7 is a shaddock type photonic crystal fiber, the end face of the photonic crystal fiber 7 is an inclined face, a spliced body formed by the multimode optical fiber 5, the hollow optical fiber 6 and the photonic crystal optical fiber 7 is suspended in the corundum tube 1, the inner cavity of the hollow optical fiber 6 is a Fabry-Perot interference cavity, the central lines of the single mode optical fiber 3, the multimode optical fiber 5, the hollow optical fiber 6 and the photonic crystal optical fiber 7 are superposed, the outer diameters of the central lines are the same and are 110 micrometers, the diameter of a fiber core of the single mode optical fiber 3 is 8.2 micrometers, the diameter of a fiber core of the multimode optical fiber 5 is 50 micrometers, and the inner diameter of the hollow optical fiber 6 is 75 micrometers. The other components and the connection relationship of the components are the same as those in embodiment 1.
Example 3
In this embodiment, the inner diameter of the corundum tube 1 is 500 μm, the outer diameter is 800 μm, the inside of the corundum tube 1 is fixedly provided with the capillary glass tube 2 by high temperature glue, the length of the corundum tube 1 is greater than the length of the capillary glass tube 2, the inner diameter of the capillary glass tube 2 is 200 μm, the outer diameter is 400 μm, the inside of the capillary glass tube 2 is fixedly provided with the single mode fiber 3 by high temperature glue, the single mode fiber 3 is positioned in the capillary glass tube 2 and is inscribed with the thermal regeneration grating 4, the grid region length of the thermal regeneration grating 4 is 15mm, the central wavelength is 1553nm, the capillary glass tube 2 is used for isolating the influence of air pressure on the thermal regeneration grating 4 and protecting the thermal regeneration grating 4, one end of the single mode fiber 3 extends out of the capillary glass tube 2 and is sequentially welded with the multimode fiber 5, the hollow fiber 6 and the photonic crystal fiber 7, the photonic crystal fiber 7 is a shaddock type photonic crystal fiber, the end face of the photonic crystal fiber 7 is an inclined face, a spliced body formed by the multimode optical fiber 5, the hollow optical fiber 6 and the photonic crystal optical fiber 7 is suspended in the corundum tube 1, the inner cavity of the hollow optical fiber 6 is a Fabry-Perot interference cavity, the central lines of the single mode optical fiber 3, the multimode optical fiber 5, the hollow optical fiber 6 and the photonic crystal optical fiber 7 are superposed, the outer diameters of the central lines are 130 mu m, the diameter of the fiber core of the single mode optical fiber 3 is 8.2 mu m, the diameter of the fiber core of the multimode optical fiber 5 is 105 mu m, and the inner diameter of the hollow optical fiber 6 is 100 mu m. The other components and the connection relationship of the components are the same as those in embodiment 1.
Example 4
In examples 1 to 3, the grapefruit-type photonic crystal fibers were replaced with panda-type photonic crystal fibers. Other components and the connection relationship of the components are the same as those of the corresponding embodiments.
Example 5
In examples 1 to 4, the corundum tube 1 was replaced with a sapphire tube. Other components and the connection relationship of the components are the same as those of the corresponding embodiments.
In order to verify the beneficial effects of the present invention, the inventor has made a test experiment of temperature pressure sensitivity using the technical solution of embodiment 1, as follows:
the optical fiber high-temperature pressure sensor packaged by the double sleeves is placed in the central position of a tube cavity of the high-temperature pressure furnace, so that the optical fiber sensor is uniformly heated, the tube cavity of the high-temperature pressure furnace is fixed in a heater, the left end of a single-mode optical fiber 3 of the optical fiber sensor is connected with one end of an sm125 optical demodulator with the wavelength resolution ratio of 1pm, the other end of the sm125 optical demodulator is connected with a computer through a USB data line, and the other end of the tube cavity can accurately control the connection of a nitrogen bottle in which gas flows.
The reflectance spectrum curve at room temperature for the double-cannula packaged fiber optic high temperature pressure sensor was recorded as shown in fig. 2.
Increasing the temperature of a high-temperature pressure furnace from room temperature to 1000 ℃ by taking 100 ℃ as a unit, keeping each temperature point for 45 minutes to ensure that the temperature in a cavity of the high-temperature pressure furnace tube is uniformly distributed, adjusting the initial state of the air pressure in the cavity of the optical double-sleeve packaged optical fiber high-temperature pressure sensor by using a nitrogen bottle to be standard atmospheric pressure, setting the standard atmospheric pressure to be 0, adjusting a gas inlet and outlet controller to enable the air pressure of the optical double-sleeve packaged optical fiber high-temperature pressure sensor to be increased from 0MPa to 1.0MPa according to the size of 0.1MPa in each step, and then decreasing the air pressure to 0MPa according to the size of 0.1MPa in each step, so that the temperature and strain response spectral line of the environment where the optical double-sleeve packaged optical fiber high-temperature pressure sensor is located can be obtained; as shown in fig. 3-6.
Results and analysis of the experiments
According to experimental analysis, the thermal regeneration grating only responds to temperature and does not respond to pressure, and the temperature sensitivity is 15.24 pm/DEG C; the fabry-perot interferometric cavity has a correspondingly small sensitivity to temperature versus pressure of 1.2 pm/deg.c. The sensitivity of the Fabry-Perot interference cavity is 4.008nm/MPa at 100 ℃, 1.694nm/MPa at 500 ℃ and 1.057nm/MPa at 1000 ℃, and according to matrix demodulation, when the sensor is in environments with different temperatures and different pressures, the ambient temperature and the pressure to be measured can be measured according to the wavelength.
Claims (10)
1. The utility model provides a two sleeve pipe encapsulated fiber optic cable high temperature pressure sensor which characterized in that: a capillary glass tube (2) is arranged in a corundum tube (1), the length of the corundum tube (1) is larger than that of the capillary glass tube (2), a single-mode fiber (3) is arranged in the capillary glass tube (2), a thermal regeneration grating (4) is inscribed on the single-mode fiber (3) in the capillary glass tube (2), one end of the single-mode fiber (3) extends out of the capillary glass tube (2) and is sequentially spliced with a multimode fiber (5), a hollow fiber (6) and a photonic crystal fiber (7) at the end part, the single-mode fiber (3), the multimode fiber (5), the hollow fiber (6) and the central line of the photonic crystal fiber (7) are overlapped, and a spliced body formed by the multimode fiber (5), the hollow fiber (6) and the photonic crystal fiber (7) is suspended in the corundum tube (1).
2. The dual ferrule packaged fiber optic high temperature pressure sensor of claim 1, wherein: the outer diameters of the single-mode optical fiber (3), the multi-mode optical fiber (5), the hollow optical fiber (6) and the photonic crystal optical fiber (7) are the same and are 110-130 mu m.
3. The double-ferrule packaged optical fiber high-temperature pressure sensor according to claim 1 or 2, wherein: the diameter of the fiber core of the single-mode optical fiber (3) is 8.2 mu m, the inner diameter of the hollow optical fiber (6) is 75-100 mu m, and the diameter of the fiber core of the multimode optical fiber (5) is 50-105 mu m.
4. The double-ferrule packaged optical fiber high-temperature pressure sensor according to claim 1 or 2, wherein: the end face of the photonic crystal fiber (7) is an inclined plane.
5. The double-ferrule packaged optical fiber high-temperature pressure sensor according to claim 1 or 2, wherein: the photonic crystal fiber (7) is a grapefruit type photonic crystal fiber or a panda type photonic crystal fiber.
6. The dual ferrule packaged fiber optic high temperature pressure sensor of claim 1, wherein: the grating region length of the thermal regeneration grating (4) is 5-15 mm, and the central wavelength is 1553 nm.
7. The dual ferrule packaged fiber optic high temperature pressure sensor of claim 1, wherein: the inner diameter of the capillary glass tube (2) is 150-200 μm, and the outer diameter is 300-400 μm.
8. The dual ferrule packaged fiber optic high temperature pressure sensor of claim 1, wherein: the inner diameter of the corundum tube (1) is 400-500 mu m, and the outer diameter is 600-800 mu m.
9. The double-ferrule packaged fiber optic high temperature pressure sensor according to claim 1 or 8, wherein: the corundum tube (1) can also be a sapphire tube.
10. The dual ferrule packaged fiber optic high temperature pressure sensor of claim 1, wherein: the corundum tube (1) and the capillary glass tube (2) are fixed through high-temperature-resistant glue, and the capillary glass tube (2) and the single-mode optical fiber (3) are fixed through high-temperature-resistant glue.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113984180A (en) * | 2021-10-19 | 2022-01-28 | 西北大学 | Ultrasonic sensor based on ultraviolet glue area inscribe grating |
| CN114777836A (en) * | 2022-03-10 | 2022-07-22 | 吉林大学 | Optical fiber high-temperature stress sensor based on yttrium aluminum garnet crystal derived optical fiber and preparation method thereof |
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2020
- 2020-12-07 CN CN202022933094.1U patent/CN213902404U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113984180A (en) * | 2021-10-19 | 2022-01-28 | 西北大学 | Ultrasonic sensor based on ultraviolet glue area inscribe grating |
| CN113984180B (en) * | 2021-10-19 | 2024-04-12 | 西北大学 | Ultrasonic sensor based on ultraviolet glue area inscription grating |
| CN114777836A (en) * | 2022-03-10 | 2022-07-22 | 吉林大学 | Optical fiber high-temperature stress sensor based on yttrium aluminum garnet crystal derived optical fiber and preparation method thereof |
| CN114777836B (en) * | 2022-03-10 | 2023-12-05 | 吉林大学 | Optical fiber high-temperature stress sensor based on yttrium aluminum garnet crystal derived optical fiber and preparation method thereof |
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