CN214793588U - High-temperature pressure sensor based on photonic crystal - Google Patents
High-temperature pressure sensor based on photonic crystal Download PDFInfo
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- CN214793588U CN214793588U CN202121230130.6U CN202121230130U CN214793588U CN 214793588 U CN214793588 U CN 214793588U CN 202121230130 U CN202121230130 U CN 202121230130U CN 214793588 U CN214793588 U CN 214793588U
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- photonic crystal
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Abstract
The utility model provides a high temperature pressure sensor based on photonic crystal, the one end butt fusion of single mode fiber has shaddock type photonic crystal fiber, the central line of single mode fiber and the coincidence of shaddock type photonic crystal fiber's central line, single mode fiber is the same with shaddock type photonic crystal fiber's cladding diameter, shaddock type photonic crystal fiber and single mode fiber butt fusion department processing air cavity a are fabry-perot and interfere the chamber, single mode fiber and shaddock type photonic crystal fiber overcoat are equipped with the corundum pipe, make shaddock type photonic crystal fiber and single mode fiber's butt fusion position be located the corundum intraductal, the one end of corundum pipe is fixed with single mode fiber through gluing. The utility model has the advantages of simple manufacture, good repeatability, high sensitivity and good stability in a large dynamic range.
Description
Technical Field
The utility model belongs to the technical field of the optical fiber sensing, concretely relates to high temperature pressure sensor based on photonic crystal.
Background
The engine, also known as the "heart" of the machine operation, is an important energy supply unit that provides the operation of the whole device. The development of the navigation field is an important national defense strategy, and the judgment of the performance improvement and the structural reliability of the core component engine of the navigation field depends on various effective test means. In an engine, a gas turbine compresses air to enter a combustion chamber to be mixed and combusted with fuel, a high-temperature and high-pressure environment is formed in the process, and the engine performs pressure precision test in the environment and at normal temperature, so that very strict requirements are provided for the high-temperature resistance, the electromagnetic resistance, the environmental radiation resistance and other aspects of a sensor, and the engine is a key problem existing in the aspect of testing at present for a long time. On the other hand, with the rapid development of modern optical technology, photoelectron detection technology, digital image processing technology and image acquisition equipment, the optical measurement mechanical technology and optical fiber sensing technology for realizing strain measurement and monitoring by using an optical method have become important branches in mechanical property testing, measurement and monitoring. Especially, optical fiber sensors, which are outstanding in the sensor field, are new sensing technologies of multidisciplinary fusion type for sensing, converting and monitoring environmental information, and have been a favorite of high-tech industries. Due to the unique advantages of the optical fiber, the optical fiber sensor has a larger stage in the sensing field, particularly in the field of engine performance monitoring, and the optical fiber sensor for simultaneously measuring temperature and pressure is designed to meet the requirements of the current engine field in order to accurately measure the performance of a machine under a high-temperature and high-pressure environment.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a high temperature pressure sensor based on photonic crystal of reasonable in design, small, sensitivity height, simple structure is provided.
The technical scheme for solving the technical problems is as follows: the utility model provides a high temperature pressure sensor based on photonic crystal, the one end butt fusion of single mode fiber has shaddock type photonic crystal fiber, the central line of single mode fiber and the coincidence of shaddock type photonic crystal fiber's central line, single mode fiber is the same with shaddock type photonic crystal fiber's cladding diameter, shaddock type photonic crystal fiber and single mode fiber butt fusion department processing air cavity a are fabry-perot and interfere the chamber, single mode fiber and shaddock type photonic crystal fiber overcoat are equipped with the corundum pipe, make shaddock type photonic crystal fiber and single mode fiber's butt fusion position be located the corundum intraductal, the one end of corundum pipe is fixed with single mode fiber through gluing.
As a preferable technical scheme, the length of the grapefruit type photonic crystal fiber is 80-150 μm.
As a preferred technical solution, the grapefruit type photonic crystal fiber 3 is a six-hole grapefruit type photonic crystal fiber.
As a preferable technical scheme, the diameter of a cladding of the six-hole grapefruit type photonic crystal fiber is 125 microns, the section of a fiber core is an irregular hexagon, 6 air holes are uniformly distributed in the circumferential direction of the fiber core, the hole center distance between every two adjacent air holes is 7.7 microns, the transverse hole diameter of each air hole is 19.7 microns, and the longitudinal hole diameter of each air hole is 15 microns.
As a preferred technical scheme, the glue is casting glue.
The utility model has the advantages as follows:
when the environmental temperature rises, the reflection spectrum of light propagating in the single mode fiber and the grapefruit type photonic crystal fiber can obviously drift, and higher temperature sensitivity can be obtained; when the environmental air pressure is increased, the cavity length of the Fabry-Perot interference cavity is changed along with the increase of the environmental air pressure, and the whole sensor has higher pressure sensitivity; the sensor composed of the single-mode fiber and the grapefruit-type photonic crystal fiber has the advantages of being simple to manufacture, good in repeatability, good in stability in a large dynamic range, and beneficial to actual temperature measurement and mass production, and corresponding sensors are different in sensitivity due to different lengths of the grapefruit-type photonic crystal fiber.
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 photonic crystal-based high-temperature pressure sensor of this embodiment is formed by connecting a single-mode fiber 1, a corundum tube 2, and a grapefruit-type photonic crystal fiber 3, wherein a grapefruit-type photonic crystal fiber 3 is fusion-spliced at one end of the single-mode fiber 1, a center line of the single-mode fiber 1 coincides with a center line of the grapefruit-type photonic crystal fiber 3, cladding diameters of the single-mode fiber 1 and the grapefruit-type photonic crystal fiber 3 are the same, the grapefruit-type photonic crystal fiber 3 is a six-hole grapefruit-type photonic crystal fiber, the length of the grapefruit-type photonic crystal fiber is 110 μm, the cladding diameter is 125 μm, a cross section of a fiber core is an irregular hexagon, 6 air holes are uniformly distributed in the circumferential direction of the fiber core, a hole center distance between two adjacent air holes is 7.7 μm, a transverse aperture of the air holes is 19.7 μm, a longitudinal aperture is 15 μm, an air cavity a formed at a fusion-spliced position of the grapefruit-type photonic crystal fiber 3 and the single-mode fiber 1 is a fabry-perot interference cavity, the corundum tube 2 is sleeved outside the single mode fiber 1 and the grapefruit type photonic crystal fiber 3, so that the welding position of the grapefruit type photonic crystal fiber 3 and the single mode fiber 1 is positioned in the corundum tube 2, and one end of the corundum tube 2 is fixed with the single mode fiber 1 through the casting glue 4.
Because the refractive indexes of the fiber cores of the single-mode fiber 1 and the grapefruit-type photonic crystal fiber 3 are not matched, when a certain parameter is used for fusion welding, the grapefruit-type photonic crystal fiber 3 can collapse to form an air cavity a, when a beam of light transmitted from the single-mode fiber 1 reaches the left end face of the air cavity a, first Fresnel reflection occurs due to the sudden change of the refractive index of a transmission medium, the reflected light is represented as first reflected light, then the transmitted light respectively generates second Fresnel reflection and third Fresnel reflection on the right end face of the air cavity a and the right end face of the photonic crystal to obtain second reflected light and third reflected light, the light is reflected back and forth between three reflecting surfaces to form multi-beam interference, part of the reflected light returns along the original path, interference occurs again after meeting, a vernier-effect-like reflection spectrum is formed, and because the envelope of the reflection spectrum only responds to the change of pressure, the response to the ambient temperature change is zero, the change of external pressure is tracked through the drift of tracking reflection spectrum envelope, the utility model discloses a temperature response is based on the thermo-optic effect and the thermal energy effect of optic fibre, when the cavity is in the external environment of temperature variation in interference to the fabry-perot, the cavity is interfered to the fabry-perot because the effect that receives the thermal energy can take place corresponding change, the effective refracting index who interferes the cavity with the fabry-perot also can produce the change to influence interference spectral line and take place the drift, consequently, the change of monitoring ambient temperature is drifted through the crest of tracking the reflection spectrum, realized that temperature and pressure distinguish the measurement simultaneously.
Example 2
In this embodiment, a shaddock-type photonic crystal fiber 3 is welded to one end of a single-mode fiber 1, the length of the shaddock-type photonic crystal fiber 3 is 80 μm, and corundum tubes 2 are sleeved outside the single-mode fiber 1 and the shaddock-type photonic crystal fiber 3, so that the welding position of the shaddock-type photonic crystal fiber 3 and the single-mode fiber 1 is located in the corundum tubes 2, and one end of the corundum tubes 2 is fixed to the single-mode fiber 1 through a casting glue 4. The other components and the connection relationship of the components are the same as those in embodiment 1.
Example 3
In this embodiment, a shaddock-type photonic crystal fiber 3 is welded to one end of a single-mode fiber 1, the length of the shaddock-type photonic crystal fiber 3 is 80 μm, and corundum tubes 2 are sleeved outside the single-mode fiber 1 and the shaddock-type photonic crystal fiber 3, so that the welding position of the shaddock-type photonic crystal fiber 3 and the single-mode fiber 1 is located in the corundum tubes 2, and one end of the corundum tubes 2 is fixed to the single-mode fiber 1 through a casting glue 4. The other components and the connection relationship of the components are the same as those in embodiment 1.
Claims (5)
1. A high-temperature pressure sensor based on photonic crystals is characterized in that: the butt fusion of single mode fiber (1) has shaddock type photonic crystal fiber (3), the central line of single mode fiber (1) and the coincidence of the central line of shaddock type photonic crystal fiber (3), single mode fiber (1) is the same with the covering diameter of shaddock type photonic crystal fiber (3), shaddock type photonic crystal fiber (3) and single mode fiber (1) butt fusion department process air cavity (a) are fabry-perot and interfere the chamber, single mode fiber (1) and shaddock type photonic crystal fiber (3) overcoat are equipped with alundum pipe (2), make the butt fusion position of shaddock type photonic crystal fiber (3) and single mode fiber (1) be located alundum pipe (2), the one end of alundum pipe (2) is fixed with single mode fiber (1) through gluing.
2. The photonic crystal-based high temperature pressure sensor of claim 1, wherein: the length of the grapefruit type photonic crystal fiber (3) is 80-150 μm.
3. The photonic crystal-based high temperature pressure sensor according to claim 1 or 2, wherein: the shaddock type photonic crystal fiber (3) is a six-hole shaddock type photonic crystal fiber.
4. The photonic crystal-based high temperature pressure sensor of claim 3, wherein: the diameter of a cladding of the six-hole grapefruit type photonic crystal fiber is 125 micrometers, the section of a fiber core is an irregular hexagon, 6 air holes are uniformly distributed in the circumferential direction of 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.
5. The photonic crystal-based high temperature pressure sensor of claim 1, wherein: the glue is casting glue (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121230130.6U CN214793588U (en) | 2021-05-31 | 2021-05-31 | High-temperature pressure sensor based on photonic crystal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121230130.6U CN214793588U (en) | 2021-05-31 | 2021-05-31 | High-temperature pressure sensor based on photonic crystal |
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| Publication Number | Publication Date |
|---|---|
| CN214793588U true CN214793588U (en) | 2021-11-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121230130.6U Expired - Fee Related CN214793588U (en) | 2021-05-31 | 2021-05-31 | High-temperature pressure sensor based on photonic crystal |
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| CN (1) | CN214793588U (en) |
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2021
- 2021-05-31 CN CN202121230130.6U patent/CN214793588U/en not_active Expired - Fee Related
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| CF01 | Termination of patent right due to non-payment of annual fee |