CN213301257U - Three-parameter measurement optical fiber sensor based on mixed structure - Google Patents
Three-parameter measurement optical fiber sensor based on mixed structure Download PDFInfo
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- CN213301257U CN213301257U CN202021820993.4U CN202021820993U CN213301257U CN 213301257 U CN213301257 U CN 213301257U CN 202021820993 U CN202021820993 U CN 202021820993U CN 213301257 U CN213301257 U CN 213301257U
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Abstract
The utility model discloses a three parameter measurement optical fiber sensor based on mixed structure. Belongs to the technical field of sensing, and comprises two single-mode fibers, a hollow fiber, an air bubble structure, a convex cone structure, a broadband light source, a spectrometer and a temperature control box. The utility model discloses a fuse one section hollow fiber to form fabry-perot and mach-zehnder interference mixed structure between an air bubble and a convex awl to be used for horizontal load, camber and the sensing of three parameters of temperature. The multi-parameter sensor is simple and easy to realize in manufacturing, compact in structure and low in cost, can solve the problem of crosstalk in the multi-parameter measuring process, and is beneficial to practical application.
Description
Technical Field
The utility model relates to a sensing technology field especially relates to a three parameter measurement optical fiber sensor based on mixed structure.
Background
The multi-parameter measurement based on the optical fiber sensor has been widely applied in the aspects of refractive index, strain, temperature, curvature and the like due to the advantages of high sensitivity, compact structure, electromagnetic interference resistance, potential low cost, multiplexing and the like.
Most of the reported multi-parameter measurement optical fiber sensors are dual-parameter measurement, for example, strain and temperature dual-parameter measurement is realized based on a dual-cavity Fabry-Perot interferometer; the method comprises the following steps of realizing simultaneous measurement of lateral pressure and strain of insensitive temperature based on a double-cavity Fabry-Perot interferometer; based on sapphire fiber Bragg grating, realizing simultaneous measurement of high temperature and strain; the double-parameter measurement of transverse pressure and refractive index is realized based on the optical fiber Fabry-Perot and Mach-Zehnder mixed structure. There are also a few reports on fiber optic sensors for three-parameter measurements, such as tilted fiber bragg grating based three-parameter fiber optic sensors for measuring refractive index, strain and temperature; a fiber michelson interferometer based on dual-core and side-hole fibers for bend, strain and temperature measurements; the optical fiber sensor based on interferometer and Bragg grating is used for temperature, strain and ultrasonic detection and the like.
It can be seen that the fiber optic sensors for three-parameter measurement reported in the prior art use either fiber bragg gratings or special optical fibers or special structures, which greatly increases the cost and complexity of the fiber optic sensors. The optical fiber Mach-Zehnder interferometer sensor has the advantages of simple manufacture, good stability, compact structure, high sensitivity and the like, is developed very quickly, and is already applied to the field of multi-parameter sensing such as temperature, refractive index, strain, curvature and the like.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems, the utility model provides a three-parameter measurement optical fiber sensor based on a mixed structure; a hollow optical fiber is welded between an air bubble structure and a convex cone structure to manufacture a Fabry-Perot and Mach-Zehnder interference mixed structure, so that three-parameter sensing of transverse load, curvature and temperature is realized; the sensor has compact structure, low cost and simple manufacturing process, can solve the problem of crosstalk in the multi-parameter measurement process, and is beneficial to practical application.
The technical scheme of the utility model is that: a three-parameter measurement optical fiber sensor based on a mixed structure; the optical fiber comprises a left single-mode optical fiber and a right single-mode optical fiber which are connected through fusion welding and have smooth end surfaces, and a hollow optical fiber is arranged between the two single-mode optical fibers;
an air bubble structure is arranged between the single-mode optical fiber and the hollow optical fiber on the left side;
and a convex cone structure is arranged between the single-mode optical fiber and the hollow optical fiber on the right side.
Further, the length of the hollow optical fiber is 11 mm.
Furthermore, the two single-mode optical fibers are respectively connected with a broadband light source and a spectrometer.
Furthermore, a temperature control box is arranged outside the air bubble structure, the hollow optical fiber and the convex cone structure.
Further, a sensor head is arranged inside the temperature control box.
The utility model has the advantages that: the utility model discloses a fuse one section hollow fiber to form fabry-perot and mach-zehnder interference mixed structure between an air bubble and a convex awl to be used for horizontal load, camber and the sensing of three parameters of temperature. The multi-parameter sensor is simple and easy to realize in manufacturing, compact in structure and low in cost, can solve the problem of crosstalk in the multi-parameter measuring process, and is beneficial to practical application.
Drawings
FIG. 1 is a flow chart of the structure of the present invention;
FIG. 2 is a schematic diagram of the hybrid structure of the present invention under an industrial microscope;
FIG. 3 is a schematic view of a temperature experiment apparatus in an embodiment of the present invention;
FIG. 4 is a schematic view of a curvature experiment apparatus in an embodiment of the present invention;
FIG. 5 is a schematic view of an exemplary strain sensing experiment apparatus according to the present invention;
in the figure, 1 is a single-mode optical fiber, 2 is an air bubble structure, 3 is a convex cone structure, 4 is a hollow optical fiber, 5 is a broadband light source, 6 is a spectrometer, 7 is a temperature control box, and 8 is a sensor head.
Detailed Description
In order to more clearly illustrate the technical solution of the present invention, the following detailed description is made with reference to the accompanying drawings:
as described in fig. 1-2; a three-parameter measurement optical fiber sensor based on a mixed structure; the optical fiber comprises a left single-mode optical fiber 1 and a right single-mode optical fiber 1 which are connected through fusion welding and have smooth end surfaces, and a hollow optical fiber 4 is arranged between the two single-mode optical fibers 1;
an air bubble structure 2 is arranged between the single-mode fiber 1 on the left side and the hollow fiber 4;
and a convex cone structure 3 is arranged between the single-mode fiber 1 and the hollow fiber 4 on the right side.
Further, the length of the hollow optical fiber 4 is 11 mm.
Further, a broadband light source 5 and a spectrometer 6 are respectively connected to the two single-mode fibers 1.
Furthermore, a temperature control box 7 is arranged outside the air bubble structure 2, the hollow optical fiber 4 and the convex cone structure 3.
Further, a sensor head 8 is installed inside the temperature control box 7.
Welding and connecting two single-mode optical fibers (SMF-28)1 with flat end faces with a small section of hollow optical fiber 4, finding a welding point under an industrial microscope, and cutting the hollow optical fiber 4 with the length of 200 mu m; then moving the tail end of the hollow optical fiber 4 with the flat end surface to an arc discharge position, setting the arc intensity to be 70bit and the arc discharge time to be 2000ms, and obtaining an air bubble structure 2; then moving the tail end of the other section of single mode fiber (SMF-28)1 with a flat end surface to an arc discharge position, setting the arc intensity to be 70bit and the arc discharge time to be 2000ms, and obtaining a convex cone structure 3; then, a section of hollow optical fiber 4 with the length of 11mm is welded between the air bubble structure 2 and the convex cone structure 3; and finally obtaining the three-parameter measurement optical fiber sensor based on the mixed structure.
As shown in fig. 3; two ends of two single mode fibers (SMF-28)1 are respectively connected with a broadband light source (BBS)5 and a spectrometer (OSA) 6; during temperature measurement, the sensor head 8 is placed in a temperature control box (TC)7 with the resolution of 0.1 ℃, the temperature is slowly increased from 30 ℃ to 80 ℃, and the step length is 10 ℃. In order to avoid the influence of stress and bending, the sensor head 8 is fixed, so that the temperature measuring part is in a constant force state; in addition, in order to ensure that the transmission spectrum of the wavelength shift is recorded under a stable temperature environment, data was recorded 10 minutes after each temperature point was stable.
As shown in fig. 4; two ends of two single mode fibers (SMF-28)1 are respectively connected with a broadband light source (BBS)5 and a spectrometer (OSA) 6; respectively stripping a small section of coating layer from the single mode fibers 1 on two sides of the optical fiber interference structure with the mixed structure through an optical fiber pliers, wherein the positions of the two small sections of optical fibers with the coating layers removed are about 18.5 cm; then fixing one small section with the coating removed on the fixed platform through ultraviolet curing glue (UV glue), and fixing the other small section on the movable platform through the ultraviolet curing glue; after the structure is fixed, the curvature of the hybrid structure fiber optic interferometer is changed through the horizontal movement of the moving platform.
For lateral load measurement, the air bubble FPI is placed horizontally between two parallel slides for lateral load measurement, as shown in fig. 5. The weight increased from 0N to 2.94N and one step to 0.49N, and the light reflected back from the air bubble was received by the spectrometer.
The utility model discloses the novelty provides and forms fabry-perot and mach-zehnder interference mixed structure to a section hollow fiber 4 butt fusion between air bubble structure 2 and a convex awl structure 3, and air bubble structure 2 forms a fabry-perot interferometer, can realize the measurement of transverse load; in addition, the hollow core fiber 4 of the mach-zehnder interferometer serves as an antiresonant reflecting optical waveguide, and simultaneous measurement of curvature and temperature can be achieved by demodulating a transmission spectrum wavelength shift of the mach-zehnder interferometer for temperature sensing and an intensity change of an ARROW tilt angle for curvature sensing.
Claims (5)
1. A three-parameter measurement optical fiber sensor based on a hybrid structure is characterized by comprising a left single-mode optical fiber and a right single-mode optical fiber which are connected through fusion welding and have smooth end surfaces, wherein a hollow optical fiber is arranged between the two single-mode optical fibers;
an air bubble structure is arranged between the single-mode optical fiber and the hollow optical fiber on the left side;
and a convex cone structure is arranged between the single-mode optical fiber and the hollow optical fiber on the right side.
2. A hybrid construction based three parameter measurement fibre sensor according to claim 1 wherein the length of the hollow core fibre is 11 mm.
3. The hybrid-structure-based three-parameter measurement optical fiber sensor according to claim 1, wherein a broadband light source and a spectrometer are respectively connected to the two single-mode optical fibers.
4. The hybrid structure-based three-parameter measurement optical fiber sensor according to claim 1, wherein a temperature control box is installed outside the air bubble structure, the hollow optical fiber and the convex cone structure.
5. A hybrid construction based three parameter measurement fiber optic sensor as claimed in claim 4, wherein a sensor head is mounted inside the temperature controlled box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202021820993.4U CN213301257U (en) | 2020-08-27 | 2020-08-27 | Three-parameter measurement optical fiber sensor based on mixed structure |
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| CN202021820993.4U CN213301257U (en) | 2020-08-27 | 2020-08-27 | Three-parameter measurement optical fiber sensor based on mixed structure |
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