CN212206125U - Temperature compensation type optical fiber Fabry-Perot high-temperature pressure sensor - Google Patents
Temperature compensation type optical fiber Fabry-Perot high-temperature pressure sensor Download PDFInfo
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- CN212206125U CN212206125U CN202021369387.5U CN202021369387U CN212206125U CN 212206125 U CN212206125 U CN 212206125U CN 202021369387 U CN202021369387 U CN 202021369387U CN 212206125 U CN212206125 U CN 212206125U
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- 239000013307 optical fiber Substances 0.000 title claims description 56
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 46
- 239000010431 corundum Substances 0.000 claims abstract description 46
- 239000000835 fiber Substances 0.000 claims abstract description 40
- 230000008929 regeneration Effects 0.000 claims abstract description 22
- 238000011069 regeneration method Methods 0.000 claims abstract description 22
- 239000003292 glue Substances 0.000 claims abstract description 12
- 229910052594 sapphire Inorganic materials 0.000 claims description 3
- 239000010980 sapphire Substances 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 claims 1
- 239000012510 hollow fiber Substances 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000012544 monitoring process Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000004069 differentiation Effects 0.000 abstract description 3
- 230000035945 sensitivity Effects 0.000 description 11
- 239000000919 ceramic Substances 0.000 description 6
- 230000008859 change Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 3
- 230000001172 regenerating effect Effects 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000009530 blood pressure measurement Methods 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000004043 responsiveness Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
A temperature compensation type fiber Fabry-Perot high-temperature pressure sensor is characterized in that a single-mode fiber is an assembly of a first cylinder, a circular truncated cone and a second cylinder, the outer diameter of the first cylinder is the same as that of the small end of the circular truncated cone, the outer diameter of the second cylinder is the same as that of the large end of the circular truncated cone, a thermal regeneration grating is engraved on the fiber core of the first cylinder section of the single-mode fiber, the first cylinder section of the single-mode fiber extends into the corundum tube from one end of the corundum tube and is fixed by high-temperature-resistant glue, the thermal regeneration grating is located in the corundum tube, one end of a hollow fiber extends into the corundum tube from the other end of the corundum tube and is fixed by the high-temperature-resistant glue, a gap is reserved between the end face of the hollow fiber and the end face of the. The utility model has the advantages of low cost, simple manufacture, high temperature resistance, etc., 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 temperature compensation formula optic fibre fabry-perot high temperature pressure sensor.
Background
The aero-engine is a machine which converts chemical energy into mechanical energy, forms high-speed jet flow, discharges the jet flow and generates thrust, is suitable for a power generation device, can also refer to the whole machine comprising a power device, and is an important mark of national defense science and technology industry as 'the pearl on the imperial crown' in modern industry. The aeroengine usually comprises high temperature, high pressure, high load and high rotating speed, and is the most complex and precise industrial product since many disciplines of comprehensive system engineering mankind, and therefore, great design and manufacturing difficulty is caused. 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 a reasonable in design, simple manufacture, with low costs, to temperature and pressure differentiation measuring temperature compensation formula optic fibre fabry perot high temperature pressure sensor in the high temperature environment is provided.
The technical scheme for solving the technical problems is as follows: the geometric shape of the single-mode optical fiber is a combination of a first cylinder, a circular truncated cone and a second cylinder, the outer diameter of the first cylinder is the same as that of the small end of the circular truncated cone, the outer diameter of the second cylinder is the same as that of the large end of the circular truncated cone, a thermal regeneration grating is engraved on the fiber core of the first cylinder section of the single-mode optical fiber, the first cylinder section of the single-mode optical fiber extends into the corundum tube from one end of the corundum tube and is fixed by high-temperature-resistant glue, the thermal regeneration grating is located in the corundum tube, one end of the hollow optical fiber extends into the corundum tube from the other end of the corundum tube and is fixed by the high-temperature-resistant glue, a gap is left between the end face of the hollow optical fiber and the end.
As a preferable technical scheme, the width of a gap between the end face of the hollow optical fiber and the end face of the first cylindrical section of the single-mode optical fiber is 15-80 μm.
As a preferable technical scheme, the diameter of the single-mode optical fiber core is 8.2 microns, and the outer diameter of the first cylinder is 80 microns to 100 microns.
Preferably, the hollow fiber has an inner diameter of 5 to 40 μm and an outer diameter of 110 to 130 μm.
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.
As a preferable technical proposal, the inner diameter of the corundum tube is 150 to 200 μm, and the outer diameter is 300 to 500 μm.
As a preferable technical scheme, the corundum tube can also be a sapphire tube.
The utility model has the advantages as follows:
the utility model discloses pass through high temperature glue encapsulation in the corundum pipe with single mode fiber first cylinder section, corundum pipe one end bonds through high temperature glue with hollow optic fibre, leaves certain interval between the hollow optic fibre terminal surface of nestification inside the corundum pipe and the single mode fiber first cylinder section terminal surface to form the interference chamber of the Brillouin Perot; carve the thermal regeneration grating on single mode fiber first cylinder section fibre core, the utility model has the advantages of low cost, simple manufacture, high temperature resistant, solved the temperature-pressure's among the high temperature environment differentiation measuring problem, can be applied to the pressure monitoring among the high temperature environment.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
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 temperature compensation type optical fiber fabry-perot high temperature pressure sensor of the present embodiment is formed by connecting a hollow optical fiber 1, a corundum tube 2, and a single mode optical fiber 3.
The single-mode optical fiber 3 is in a combination of a first cylinder, a circular truncated cone and a second cylinder, the outer diameter of the first cylinder is the same as that of the small end of the circular truncated cone, the outer diameter of the first cylinder is 90 micrometers, the outer diameter of the large end of the circular truncated cone is the same as that of the second cylinder, the second cylinder is a standard single-mode optical fiber, the diameter of a fiber core of the single-mode optical fiber 3 is 8.2 micrometers, the first cylinder section of the single-mode optical fiber 3 extends into the corundum tube 2 from one end of the corundum tube 2 and is sealed and fixed by high-temperature ceramic glue, a thermal regeneration grating 4 is engraved on the fiber core of the first cylinder section of the single-mode optical fiber 3 in the corundum tube 2, the length of a grating area is 10mm, the central wavelength is 1553nm, the inner diameter of the corundum tube 2 is 180 micrometers, the outer diameter is 400 micrometers, one end of the hollow optical fiber 1 extends into the corundum tube 2 from the other end of the corundum tube 2 and is sealed and fixed by the high-temperature ceramic glue, a Fabry-Perot interference cavity is formed, the Fabry-Perot interference cavity simultaneously isolates the influence of pressure on the thermal regeneration grating 4, the inner diameter of the hollow optical fiber 1 is 25 micrometers, the outer diameter of the hollow optical fiber is 120 micrometers, the other end face of the hollow optical fiber 1 is an inclined face, and the light path reflected by the end face is prevented from returning.
Example 2
In this embodiment, the geometric shape of the single mode fiber 3 is a combination of a first cylinder, a circular truncated cone and a second cylinder, the outer diameter of the first cylinder is the same as the outer diameter of the small end of the circular truncated cone, the outer diameter of the first cylinder is 80 μm, the outer diameter of the large end of the circular truncated cone is the same as the outer diameter of the second cylinder, the second cylinder is a standard single mode fiber, the diameter of the fiber core of the single mode fiber 3 is 8.2 μm, the first cylinder of the single mode fiber 3 extends into the corundum tube 2 from one end of the corundum tube 2 and is sealed and fixed by high temperature ceramic cement, a thermal regeneration grating 4 is engraved on the fiber core of the first cylinder of the single mode fiber 3 in the corundum tube 2, the length of the grating area is 5mm, the central wavelength is 1553nm, the inner diameter of the corundum tube 2 is 150 μm, the outer diameter is 300 μm, one end of the hollow fiber 1 extends into the corundum tube 2 from the other end of the corundum tube 2 and is sealed and fixed by high temperature ceramic cement, a gap with a, a Fabry-Perot interference cavity is formed, the inner diameter of the hollow optical fiber 1 is 5 micrometers, the outer diameter of the hollow optical fiber is 110 micrometers, the other end face of the hollow optical fiber 1 is an inclined face, and the light reflected by the end face is prevented from returning back.
Example 3
In this embodiment, the geometric shape of the single mode fiber 3 is a combination of a first cylinder, a circular truncated cone and a second cylinder, the outer diameter of the first cylinder is the same as the outer diameter of the small end of the circular truncated cone, the outer diameter of the first cylinder is 100 μm, the outer diameter of the large end of the circular truncated cone is the same as the outer diameter of the second cylinder, the second cylinder is a standard single mode fiber, the diameter of the fiber core of the single mode fiber 3 is 8.2 μm, the first cylinder of the single mode fiber 3 extends into the corundum tube 2 from one end of the corundum tube 2 and is sealed and fixed by high temperature ceramic glue, a thermal regeneration grating 4 is engraved on the fiber core of the first cylinder of the single mode fiber 3 in the corundum tube 2, the length of the grating area is 15mm, the central wavelength is 1553nm, the inner diameter of the corundum tube 2 is 200 μm, the outer diameter is 500 μm, one end of the hollow fiber 1 extends into the corundum tube 2 from the other end of the corundum tube 2 and is sealed and fixed by high temperature ceramic glue, a gap with a, a Fabry-Perot interference cavity is formed, the inner diameter of the hollow optical fiber 1 is 40 mu m, the outer diameter of the hollow optical fiber is 130 mu m, and the other end face of the hollow optical fiber 1 is an inclined face, so that the light reflected by the end face is prevented from returning.
Example 4
In embodiments 1 to 3, the sapphire tube was used as the corundum tube 2, and the other components and the connection relationship between the components were the same as those in the corresponding embodiments.
The working principle of the utility model is as follows:
light enters from the second cylindrical end face of the single-mode optical fiber, passes through the thermal regeneration grating, the left and right end faces of the hollow optical fiber and the first cylindrical end face of the single-mode optical fiber for reflection, one part of incident light returns through the reflection original path of the thermal regeneration grating, the other part of the incident light is transmitted through the thermal regeneration grating and is transmitted through the Fabry-Perot interference cavity and the left end face of the hollow optical fiber, the left end face of the hollow optical fiber is obliquely cut, therefore, the reflected light of the end face cannot reflect back to the thermal regeneration grating, interference spectrum is not influenced, the light transmitted through the Fabry-Perot interference cavity is reflected through the left end face of the hollow optical fiber and the first cylindrical end face of the single-mode optical fiber to form two beams of reflected light which are mutually interfered and return.
In the Fabry-Perot interference spectrum of the utility model, the mth order interference peak center wavelength lambdamComprises the following steps:
where n is the refractive index of the interferometric microcavity, L3Is the length of a closed cavity in the corundum tube, L2The length of a first cylindrical section of a single-mode optical fiber in a corundum tube;
pressure sensitivity S of wavelength shift of mth order interference peak when pressure acts on Fabry-Perot interference cavitypComprises the following steps:
wherein P is the pressure applied to the microcavity, A is the cross-sectional area of the fiber, and L is1Is the length of the Fabry-Perot actual interference cavity; from this the pressure sensitivity S is seenpLength L of actual interference cavity of Fabry-Perot1In inverse proportion.
When the temperature of the external environment changes, the length L of the Fabry-Perot interference cavity1The relationship to temperature change is:
ΔL1＝[αc(L2+L1)-αfL2]·ΔT
in the formula,. DELTA.L1For the change in length of the Fabry-Perot interferometric cavity, alphacIs the coefficient of thermal expansion, alpha, of the corundum tubefThe taper of the first cylindrical section of the single-mode optical fiber, and delta T is the temperature variation;
the wavelength of the Fabry-Perot interference microcavity is expressed as the following change with temperature:
wherein, Delta lambda is the variation of the wavelength of the Fabry-Perot interference cavity, lambda0Is the initial wavelength, STIs the temperature sensitivity of the Fabry-Perot interference cavity;
since the pressure sensitivity of the thermal regeneration grating is a function of temperature, the wavelength variation with temperature and pressure according to the present invention is expressed as follows
In the formula, Δ λi(i ═ 1, 2) represents the thermal regeneration grating resonance wavelength shift, αiIs the temperature sensitivity, k, of the thermally regenerative gratingPTiIs the pressing of the thermally regenerative grating at different temperaturesForce sensitivity, bPiIs the thermal regeneration grating pressure sensitivity, T0Is the initial temperature, Δ T is the temperature change, and Δ P is the pressure change.
Because the fabry-perot interferes the chamber and is sensitive to temperature, pressure, and the thermal regeneration grating of encapsulating to the corundum pipe is higher to temperature responsiveness, and is lower to pressure responsiveness, 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 are respectively as follows:
ΔλFP＝SP·ΔP′+ST·ΔT′
Δλi＝bPi·ΔP′+αi·ΔT′
wherein Δ P 'is the actual total variation of pressure, Δ T' is the actual total variation of temperature, and Δ λFPIs a wavelength shift of a Fabry-Perot interferometric cavity, Delta lambda'iFor wavelength drift of thermally regenerative gratings, SPAnd bPiPressure sensitivity, S, of the F-P chamber and RFBG, respectivelyTAnd alphaiTemperature sensitivity of the F-P chamber and RFBG, respectively.
The coefficient matrix for temperature compensation is:
the utility model discloses realize distinguishing simultaneously under the temperature more than 1100 ℃ and measuring the temperature pressure parameter.
Claims (7)
1. A temperature compensation type optical fiber Fabry-Perot high-temperature pressure sensor is characterized in that: the geometric shape of the single-mode optical fiber (3) is an assembly of a first cylinder, a circular truncated cone and a second cylinder, the outer diameter of the first cylinder is the same as that of the small end of the circular truncated cone, the outer diameter of the second cylinder is the same as that of the large end of the circular truncated cone, a thermal regeneration grating is engraved on the fiber core of the first cylinder section of the single-mode optical fiber (3), the first cylinder section of the single-mode optical fiber (3) extends into the corundum tube (2) from one end of the corundum tube (2) and is fixed by high-temperature-resistant glue, the thermal regeneration grating is located in the corundum tube (2), one end of the hollow optical fiber (1) extends into the corundum tube (2) from the other end of the corundum tube (2) and is fixed by the high-temperature-resistant glue, a gap is reserved between the end face of the hollow optical fiber (1) and the end face of the first cylinder section of the single-mode optical.
2. The temperature-compensated fiber fabry-perot high temperature pressure sensor of claim 1, wherein: the width of a gap between the end face of the hollow optical fiber (1) and the end face of the first cylindrical section of the single-mode optical fiber (3) is 15-80 mu m.
3. The temperature-compensated fiber fabry-perot high temperature pressure sensor of claim 1, wherein: the diameter of the fiber core of the single-mode fiber (3) is 8.2 mu m, and the outer diameter of the first cylinder is 80-100 mu m.
4. The temperature-compensated fiber fabry-perot high temperature pressure sensor according to claim 1 or 2, wherein: the inner diameter of the hollow optical fiber (1) is 5-40 μm, and the outer diameter is 110-130 μm.
5. The temperature-compensated fiber fabry-perot high temperature pressure sensor of claim 1, wherein: the length of the grid region of the thermal regeneration grating is 5-15 mm, and the central wavelength is 1553 nm.
6. The temperature-compensated fiber fabry-perot high temperature pressure sensor of claim 1, wherein: the inner diameter of the corundum tube (2) is 150-200 mu m, and the outer diameter is 300-500 mu m.
7. The temperature-compensated fiber fabry-perot high temperature pressure sensor according to claim 1 or 6, wherein: the corundum tube (2) can also be a sapphire tube.
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| CN202021369387.5U CN212206125U (en) | 2020-07-13 | 2020-07-13 | Temperature compensation type optical fiber Fabry-Perot high-temperature pressure sensor |
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| CN202021369387.5U CN212206125U (en) | 2020-07-13 | 2020-07-13 | Temperature compensation type optical fiber Fabry-Perot high-temperature pressure sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114279353A (en) * | 2021-12-28 | 2022-04-05 | 中国人民解放军国防科技大学 | High-temperature strain sensor of sapphire optical fiber F-P cavity cascade SFBG |
| CN114322814A (en) * | 2021-12-28 | 2022-04-12 | 中国人民解放军国防科技大学 | Anti-scouring high-temperature strain sensor for metal casting of sapphire fiber grating |
-
2020
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114279353A (en) * | 2021-12-28 | 2022-04-05 | 中国人民解放军国防科技大学 | High-temperature strain sensor of sapphire optical fiber F-P cavity cascade SFBG |
| CN114322814A (en) * | 2021-12-28 | 2022-04-12 | 中国人民解放军国防科技大学 | Anti-scouring high-temperature strain sensor for metal casting of sapphire fiber grating |
| CN114279353B (en) * | 2021-12-28 | 2023-08-29 | 中国人民解放军国防科技大学 | High-temperature strain sensor of sapphire optical fiber F-P cavity cascade SFBG |
| CN114322814B (en) * | 2021-12-28 | 2024-06-07 | 中国人民解放军国防科技大学 | Anti-scouring high-temperature strain sensor cast by sapphire fiber grating metal |
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