CN210180567U - Fiber grating directional pressure sensor and fiber grating preparation device - Google Patents
Fiber grating directional pressure sensor and fiber grating preparation device Download PDFInfo
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- CN210180567U CN210180567U CN201920846832.3U CN201920846832U CN210180567U CN 210180567 U CN210180567 U CN 210180567U CN 201920846832 U CN201920846832 U CN 201920846832U CN 210180567 U CN210180567 U CN 210180567U
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Abstract
The utility model is suitable for an optical fiber sensing technical field provides a fiber grating directivity pressure sensor and fiber grating preparation facilities, and fiber grating directivity pressure sensor includes both sides hole optic fibre, bearing plate, atress board and spectral analysis module: the double-side hole optical fiber comprises an optical fiber cladding, an optical fiber core and two air holes, wherein the optical fiber core and the two air holes are arranged in the optical fiber cladding; the diameter of the air hole is larger than that of the fiber core of the optical fiber and smaller than the radius of the fiber cladding; the double-side hole optical fiber is used for accessing the measuring light beam, outputting the test light beam to the spectral analysis module after being refracted by the Bragg grating; and the spectrum analysis module is used for demodulating the spectrum of the test light beam and obtaining the magnitude and the direction of the force applied to the stress plate. The utility model provides a fiber grating directivity pressure sensor has the directivity promptly, can improve sensitivity again under the prerequisite that reduces the preparation degree of difficulty.
Description
Technical Field
The utility model relates to an optical fiber sensing technical field especially relates to a fiber grating directivity pressure sensor and fiber grating preparation facilities.
Background
The pressure sensor is one of the optical fiber sensors, and is widely applied to the measurement of the stress of the intelligent robot finger, the vehicle-mounted gravity, the water pressure of a static surface, the surface tension of a device and the like due to the characteristics of simple principle, strong anti-electromagnetic interference capability, difficult corrosion and the like. The existing pressure sensor mainly adopts optical fibers for guiding light based on the principle of total internal reflection of the optical fibers, such as common single-mode optical fibers, polarization-maintaining optical fibers, micro-structured optical fibers and the like, and the external load is detected by carving Bragg gratings with various periods in the optical fibers to form the transverse pressure sensor.
However, the sensitivity of the pressure sensor manufactured by etching the bragg grating on the common single-mode fiber is generally insensitive to the directivity of the pressure sensor manufactured by etching the bragg grating on the polarization-preserving fiber, the pressure sensor manufactured by etching the bragg grating on the microstructure fiber has the influence of scattering due to a large number of holes, so that the etching process is complicated, and the pressure sensor manufactured by manufacturing the bragg grating on the three fibers has no directivity, so that the pressure sensor which has high sensitivity, directivity and simple etching program needs to be designed.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main aim at provides a fiber grating directionality pressure sensor and fiber grating preparation facilities to solve prior art and make the pressure sensor that the Bragg grating formed in optic fibre and do not have the directionality, and pressure sensor's sensitivity is low, the loaded down with trivial details complicated problem of process of manufacture.
In order to achieve the above object, a first aspect of the embodiments of the present invention provides a fiber grating directional pressure sensor, including a double-sided hole fiber, a bearing plate, a stress plate and a spectrum analysis module:
the double-side-hole optical fiber is placed between the bearing plate and the stress plate, and the output end of the double-side-hole optical fiber is connected with the spectral analysis module;
the double-side-hole optical fiber comprises an optical fiber cladding, an optical fiber core and two air holes, wherein the optical fiber core and the two air holes are arranged in the optical fiber cladding;
the diameter of the air hole is larger than that of the fiber core of the optical fiber and smaller than the radius of the fiber cladding;
the double-side-hole optical fiber is used for accessing a measuring beam, and outputting a test beam to the spectrum analysis module after being refracted by the Bragg grating;
the spectrum analysis module is used for demodulating the spectrum of the test light beam to obtain the magnitude and the direction of the force exerted on the stress plate.
Optionally, the fiber grating directional pressure sensor further comprises a double-sided hole supporting fiber;
the double-side hole supporting optical fiber and the double-side hole optical fiber are arranged between the bearing plate and the stress plate in parallel.
Optionally, the centers of the two air holes are on the same straight line with the center of the optical fiber core.
Optionally, the bragg grating has a length of 535 um.
A second aspect of the embodiments of the present invention provides a fiber grating manufacturing apparatus, which is applied to manufacturing a fiber grating directional pressure sensor, and includes a high-temperature high-pressure reaction kettle, a charge-coupled device image sensor CCD, an ultraviolet laser, a light source, a lens group, a phase mask plate, an electric rotating fixture, a three-dimensional adjusting frame, a PC module, and a transmission light analysis module;
the ultraviolet laser, the lens group and the phase mask plate are sequentially connected;
the electric rotary fixture is internally provided with a double-side-hole optical fiber, the electric rotary fixture is arranged on the three-dimensional adjusting frame, and the PC module is arranged on the electric rotary fixture and connected with the CCD;
the phase mask plate is arranged above the double-side-hole optical fiber and focuses light beams on the double-side-hole optical fiber, the transmitted light analysis module is connected with the output end of the double-side-hole optical fiber, and the light source is connected with the input end of the double-side-hole optical fiber;
the high-temperature high-pressure reaction kettle is used for carrying hydrogen on the double-edge hole optical fiber;
the CCD is used for calibrating the directions of the double-side holes;
the ultraviolet laser is used for providing coherent light when writing Bragg grating in the double-side-hole optical fiber;
the lens group is used for processing the coherent light and focusing the coherent light;
the phase mask plate is used for diffracting light beams with different orders to the double-side-hole optical fiber according to the focused coherent light and writing the Bragg grating according to a calibration direction;
the electric rotary clamp is used for fixing the position and the rotating direction of the optical fiber;
the three-dimensional adjusting frame is used for adjusting the positions of the double-side-hole optical fibers;
the PC module is used for displaying CCD imaging and controlling the direction of the electric rotating clamp;
and the transmission light analysis module is used for collecting and analyzing the transmission light signals in the Bragg grating.
Optionally, the lens group includes a reflector, a diaphragm and a cylindrical lens, which are arranged in sequence.
The embodiment of the utility model provides a fiber grating directional pressure sensor, the main part is bilateral hole optic fibre, wherein, bilateral hole optic fibre includes the optical fiber cladding, only has two air holes in the optical fiber cladding and arranges the optic fibre core in the middle of two air holes, still writes the Bragg grating that has the directionality in the optic fibre core, consequently, will write the bilateral hole optic fibre that has the Bragg grating of directionality, with bearing plate, atress board and spectral analysis module combination composition pressure sensor have the directionality; structurally, due to the fact that the number of the air holes is small, the diameter of the air holes is large, and the influence of scattering is small, the process of writing the double-hole optical fiber in the optical fiber core is not influenced by scattering, and the writing difficulty of the optical fiber grating is reduced; in addition, owing to have two big air holes, when external force applys in the equidirectional of bilateral hole optic fibre when going, bilateral hole optic fibre compares with polarization maintaining optical fibre and has the different sensitivity of equidirectional again, compares with ordinary single mode fiber and has improved sensitivity, then the embodiment of the utility model provides a fiber grating directivity pressure sensor has the directivity promptly, can improve sensitivity under the prerequisite that reduces the preparation degree of difficulty again.
Drawings
Fig. 1 is a schematic structural diagram of a fiber grating directional pressure sensor according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a double-sided hole optical fiber according to an embodiment of the present invention;
fig. 3 is a schematic diagram of different pressure sensitivities of a fiber grating directional pressure sensor provided in an embodiment of the present invention in different directions;
fig. 4 is a schematic view of an implementation flow of a fiber grating manufacturing method according to an embodiment of the present invention;
FIG. 5 is a detailed flowchart illustrating the step S102 in FIG. 4;
fig. 6 is a transmission spectrum of a double-sided hole optical fiber according to an embodiment of the present invention;
fig. 7 is a schematic view of a structure of a fiber grating manufacturing apparatus according to a third embodiment of the present invention.
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Suffixes such as "module", "part", or "unit" used to denote elements herein are used only for the convenience of description of the present invention, and have no specific meaning in themselves. Thus, "module" and "component" may be used in a mixture.
In the following description, the serial numbers of the embodiments of the present invention are for description only, and do not represent the merits of the embodiments.
Example one
As shown in fig. 1, an embodiment of the present invention provides a fiber grating directional pressure sensor 100, which includes a double-hole fiber 10, a bearing plate 20, a stress plate 30, and a spectrum analysis module 40.
In the embodiment of the present invention, the connection relationship among the parts of the fiber grating directional pressure sensor is as follows:
the double-side-hole optical fiber 10 is placed between the bearing plate 20 and the stress plate 30, the double-side-hole optical fiber 10 and the stress plate 30 are both placed on the bearing plate 20, external force needing to be measured is applied to the stress plate 30, the output end of the double-side-hole optical fiber 10 is connected with the spectral analysis module 40, light beams input by the double-side-hole optical fiber 10 are output to the spectral analysis module 40, during measurement, the light beams are refracted in the double-side-hole optical fiber 10, and spectral analysis can be specifically carried out in the spectral analysis module 40.
In specific application, a double-side-hole optical fiber is placed between a bearing plate and a stress plate, and is difficult to fix under the condition of maintaining the natural deformation of the double-side-hole optical fiber under stress.
Therefore, as shown in fig. 1, the fiber grating directional pressure sensor 100 according to an embodiment of the present invention further includes a double-side hole supporting fiber 50, and the double-side hole supporting fiber 50 and the double-side hole fiber 10 are placed between the bearing plate 20 and the stress plate 30 in parallel, as a structure for supporting, protecting and referencing.
In a specific application, the main body of the fiber grating directional pressure sensor 100 is a double-side hole fiber 10, and the embodiment of the present invention further describes the structure thereof in detail.
As shown in fig. 2, the end face structure and the cross-sectional structure of the double-sided hole optical fiber 10 are shown. The double-sided hole optical fiber 10 comprises an optical fiber cladding 11, an optical fiber core 12 arranged in the optical fiber cladding 11 and two air holes 13, wherein the two air holes 13 are positioned at two ends of the optical fiber core 12, and a Bragg grating 14 with directivity is also written in the optical fiber core 12.
In specific application, the double-edge hole optical fiber 10 is used for accessing a measuring beam, and outputting a test beam to the spectral analysis module after being refracted by the bragg grating;
and the spectrum analysis module 40 is used for demodulating the spectrum of the test light beam and obtaining the magnitude and the direction of the force applied to the stress plate.
In one embodiment, the centers of the two air holes 13 are on the same straight line with the center of the optical fiber core 12; the inner and outer sides of the double-hole optical fiber are of symmetrical structures by setting the position relation between the air holes and the optical fiber core, so that the measurement accuracy of the double-hole optical fiber grating pressure sensor is improved.
In one embodiment, the length of the bragg grating 14 is 535 um; the grating is used as a modulation and demodulation functional structure of the optical fiber, and the submicron size of the grating determines that the fiber grating directional pressure sensor has submicron resolution.
In the double-sided hole fiber 10 shown in fig. 2, the diameter of the air holes 13 is larger than the diameter of the fiber core 12 and smaller than the radius of the fiber cladding 11.
In a particular application, the diameter of the air holes has a value greater than four times the diameter of the fiber core.
In pressure sensor, the air hole in the optic fibre is more in quantity, then can make the light beam produce the scattering when propagating in the optic fibre, and in the fiber grating directivity pressure sensor that the embodiment of the utility model provides an among, the quantity in the air hole of double-sided hole optic fibre is few, and the diameter is big, and the influence of scattering is little, consequently writes the process of making double-sided hole optic fibre and will not receive the scattering influence in the optic fibre core.
Further, if the diameter of the air hole is set to be large, if an external force is applied in different directions along the double-sided hole fiber, the double-sided hole fiber will have different sensitivities in different directions compared to the polarization maintaining fiber, and the sensitivity will be improved compared to the ordinary single mode fiber.
As shown in fig. 3, the embodiment of the present invention further provides different pressure sensitivities of the fiber grating directional pressure sensor in different directions, when the scale in fig. 3 represents that the light beam propagates in the fiber grating, the difference between the propagation peak values and the ratio of the external force applied on the stress plate are in nm/N, and in fig. 3, the point close to 0 to 180 degrees represents that the sensitivity is small, and the point close to 90 to 270 degrees represents that the sensitivity is high.
The embodiment of the utility model provides a fiber grating directional pressure sensor, the main part is bilateral hole optic fibre, wherein, bilateral hole optic fibre includes the fiber cladding, only has two air holes in the fiber cladding and arranges the optic fibre core in the middle of two air holes, still writes the bragg grating that has the directionality in the optic fibre core, consequently, will write the bilateral hole optic fibre that has the bragg grating of directionality, have the directionality with bearing plate, stress plate and spectral analysis module combination's pressure sensor; structurally, due to the fact that the number of the air holes is small, the diameter of the air holes is large, and the influence of scattering is small, the process of writing the double-hole optical fiber in the optical fiber core is not influenced by scattering, and the writing difficulty of the optical fiber grating is reduced; in addition, owing to have two big air holes, when external force applys in the equidirectional of bilateral hole optic fibre when going, bilateral hole optic fibre compares with polarization maintaining optical fibre and has the different sensitivity of equidirectional again, compares with ordinary single mode fiber and has improved sensitivity, then the embodiment of the utility model provides a fiber grating directivity pressure sensor has the directivity promptly, can improve sensitivity under the prerequisite that reduces the preparation degree of difficulty again.
Example two
As shown in fig. 4, an embodiment of the present invention provides a fiber grating manufacturing method, which is applied to manufacturing a fiber grating directional pressure sensor, and includes, but is not limited to, the following steps:
and S101, constructing a grating writing system.
In the step S101, the grating writing system uses the refractive index change characteristic of the photoinduced fiber core, and uses a special process, such as thermal processing of ultraviolet light, to make the refractive index of the fiber core generate a permanent periodic change to form a specific grating; the grating has characteristics similar to a wavelength selector and can reflect the human light with the wavelength meeting the Bragg reflection condition.
In the embodiment of the present invention, the grating writing system is used for writing a bragg grating, and the central wavelength thereof satisfies: λ B ═ 2neff Λ, where 2neff is the effective index of the fiber core and Λ is the grating period.
And S102, writing a directional Bragg grating in the double-side-hole optical fiber through the grating writing system.
In step S102, the bragg grating is a diffraction grating formed by axially periodically modulating the refractive index of the optical fiber core, and the directivity of the bragg grating is expressed as the transverse stress of the double-sided hole fiber.
As shown in fig. 5, an embodiment of the present invention shows a detailed implementation flow of step S102, which includes:
s1021, calibrating the grating processing position in the double-side-hole optical fiber, and calibrating the proceeding direction of the double-side-hole optical fiber.
In the above step S1021, the proceeding direction of the double-sided optical fiber is a direction from the input position to the output position of the light beam in the double-sided optical fiber.
In specific application, before the grating processing position is calibrated, the double-edge hole optical fiber is fixed at a designated position, and the designated position takes the grating preparation system as a reference, namely the double-edge hole optical fiber is fixed at the designated position of the grating preparation system.
S1022, adjusting the position of the double-side-hole optical fiber to enable the grating preparation system to focus at the grating processing position.
In step S1022, the grating preparation system uses a thermal processing method of ultraviolet light to realize writing of the grating, and the main process is as follows: the method comprises the steps of firstly accessing ultraviolet laser, processing the ultraviolet laser, focusing the processed ultraviolet laser on a double-sided hole optical fiber, and changing the refractive index of the fiber core of the optical fiber to finish the preparation of the grating.
And S1023, when the grating writing system processes the double-side-hole optical fiber, acquiring a transmission spectrum of the Bragg grating.
S1024, analyzing the spectral quality and the change of the position of a resonance peak according to the transmission spectrum;
and S1025, judging whether the Bragg grating is completely written or not according to the spectral quality and the change of the position of the resonance peak.
In the above steps S1023 to S1025, the optical parameter of the light beam after passing through the bragg grating can be analyzed by the transmission spectrum.
As shown in fig. 6, the embodiment of the present invention further illustrates a transmission spectrum of the double-edge hole optical fiber. Wherein the horizontal axis represents a wavelength value in nm; the vertical axis represents transmission values in dB. In fig. 6, after the processed uv laser passes through the double-sided hole fiber, the wavelength of the light beam passing through the double-sided hole fiber is 1553nm to 1554 nm.
S103, placing the double-side-hole optical fiber written with the Bragg grating between the bearing plate and the stress plate, and connecting the output end of the double-side-hole optical fiber with the spectral analysis module.
In a specific application, in order to increase the photosensitivity of the optical fiber, after the grating writing system is constructed, before the bragg grating with directionality is written in the double-edge hole optical fiber through the grating writing system, hydrogen carrying treatment can be carried out on the double-edge hole optical fiber.
Wherein, the hydrogen-carrying treatment of the double-side-hole optical fiber can be carried out in a high-temperature high-pressure reaction kettle.
EXAMPLE III
The embodiment of the utility model provides a fiber grating preparation facilities 200 is applied to fiber grating directivity pressure sensor's preparation, including high temperature high pressure reation kettle 201, charge-coupled device image sensor CCD202, ultraviolet laser 203, light source 204, battery of lens 205, phase place mask plate 206, electronic rotary fixture 207, three-dimensional adjustment frame 208, PC module 209 and transmission light analysis module 210.
The embodiment of the utility model provides a fiber grating preparation facilities 200 for prepare bragg grating in bilateral hole optic fibre, in concrete application, after preparing bragg grating in bilateral hole optic fibre through fiber grating preparation facilities, still need according to the fiber grating preparation method in embodiment two, preparation fiber grating directionality pressure sensor.
As shown in fig. 7, the connection relationship among the parts of the fiber grating manufacturing apparatus is as follows:
the ultraviolet laser 203, the lens group 205 and the phase mask 206 are connected in sequence, the ultraviolet laser 203 provides laser, and the laser is processed through the lens group 205 and the phase mask 206; the electric rotary clamp 207 is internally provided with the double-side-hole optical fiber 10, the electric rotary clamp 207 is arranged on the three-dimensional adjusting frame 208, and the PC module 209 is arranged on the electric rotary clamp 207 and connected with the CCD 202; the phase mask plate 206 is arranged above the double-side-hole optical fiber 10, light beams are focused on the double-side-hole optical fiber 10, the transmitted light analysis module 210 is connected with the output end of the double-side-hole optical fiber 10, and the light source 204 is connected with the input end of the double-side-hole optical fiber 10; the electric rotating clamp 207 and the three-dimensional adjusting frame 208 fix the double-sided hole optical fiber 10, but the three-dimensional rotating frame 208 can rotate horizontally to adjust the position of the double-sided hole optical fiber 10; because the incident direction of the processed ultraviolet laser is not changed, the fixture 207 can be electrically rotated to adjust the double-sided optical fiber 10 to axially rotate the double-sided optical fiber, so that the action position of the processed ultraviolet laser is changed, and the transmitted light analysis module 210 actually analyzes the light beam passing through the written or unwritten bragg grating in the double-sided optical fiber 10 although the output end of the double-sided optical fiber 10 is connected.
In the embodiment of the present invention, the high temperature and high pressure reaction kettle 201 is used for loading hydrogen to the double-side hole optical fiber;
the CCD202 is used for calibrating the directions of the double-side holes;
the ultraviolet laser 203 is used for providing coherent light when writing Bragg gratings in the double-edge hole optical fiber;
a lens group 204 for processing the coherent light and focusing the coherent light;
in the embodiment of the present invention, the lens assembly 204 includes a reflector, a diaphragm and a cylindrical lens arranged in sequence.
The phase mask 205 is used for diffracting light beams of different orders to the bilateral hole optical fiber according to the focused coherent light, and writing the Bragg grating according to a calibrated direction;
an electric rotary jig 206 for fixing the position and the rotation direction of the optical fiber;
a three-dimensional adjusting bracket 207 for adjusting the position of the double-side-hole optical fiber;
a PC module 208 for displaying CCD imaging and controlling the direction of the electric rotating jig;
and the transmission light analysis module 209 is used for collecting and analyzing the transmission light signals in the Bragg grating.
In the embodiment of the present invention, two electric rotating fixtures are provided to make each part of the double-hole optical fiber rotate synchronously, and a PC module is provided on each electric rotating fixture, and one of the PC modules is connected to the CCD for direction calibration and monitoring.
Example four
The embodiment of the utility model provides a preparation process of fiber grating directivity pressure sensor is shown to the realization process of the fiber grating preparation method that the explanation embodiment two provided, and the theory of operation of the fiber grating preparation facilities that embodiment three provided.
The preparation process of the fiber grating directional pressure sensor can be divided into the preparation of the fiber grating and the preparation of the fiber grating directional pressure sensor.
When preparing the fiber grating, firstly, a double-side-hole fiber is selected. The high-temperature high-pressure reactor is used for carrying out high-temperature high-hydrogen-ballast treatment on the optical fiber, so that the photosensitivity of the optical fiber is improved.
And then, constructing a grating writing system, wherein the structure of the grating writing system is shown in fig. 7, and the grating writing system comprises a light path constructed by a charge-coupled device image sensor CCD, an ultraviolet laser, a light source, a lens group, a phase mask plate, an electric rotating clamp, a three-dimensional adjusting frame, a PC module and a transmission light analysis module, wherein the lens group comprises a reflector, a diaphragm and a cylindrical lens.
The implementation of the fiber grating preparation method and the working principle of the fiber grating preparation device can be represented as follows:
providing laser with the wavelength of 266nm by an ultraviolet laser of the grating writing system, reflecting the laser by a reflector, and then injecting the laser into a diaphragm, wherein the size of a light spot can be controlled by the diaphragm; laser from the diaphragm passes through the cylindrical lens, the circular light spots are converged into linear light spots, and the energy density of the laser light spots is increased, wherein the focal length of the cylindrical lens is 50.2 mm; finally, laser is diffracted into different orders through a phase mask plate, the energy is mainly concentrated on +/-1, and the period of the phase mask plate is 1070 nm; at the position close to the phase mask plate, the distance is about 150-. After the grating writing system is constructed, the hydrogen-loaded double-edge hole optical fiber is placed on an electric rotating clamp, direction calibration and machining position calibration are carried out through CCD106 imaging, the rotating angle of the hydrogen-loaded double-edge hole optical fiber is controlled through the CCD106 imaging, and meanwhile the directions of the CCD imaging and the electric rotating clamp are obtained through a PC module; and then adjusting the three-dimensional adjusting frame to enable the double-side-hole optical fiber to be in the optimal focusing state, enabling ultraviolet laser to act on a processing position after passing through the lens group and the phase mask plate, writing the optical fiber grating on the double-side-hole optical fiber core by utilizing the interference phenomenon of light intensity distribution, connecting the output end of a light source with the input end of the double-side-hole optical fiber, connecting the output end of the double-side-hole optical fiber with a transmission light analysis module, recording and monitoring in real time through the transmission light analysis module, and judging the preparation degree of the optical fiber grating.
In the embodiment of the present invention, the optical fiber writing system is a bragg grating in the double-side hole optical fiber, and the length of the bragg grating is 535 um.
When the fiber bragg grating directional pressure sensor is prepared, after the bragg grating is prepared in the double-side-hole optical fiber, the double-side-hole optical fiber and the double-side-hole supporting optical fiber are placed on the bearing plate in parallel, the bearing plate is covered with the stress plate, and under the application of external measuring force, the spectrum analysis module is used for analyzing spectrum change and demodulation to obtain the size and the direction of the external force.
The above-mentioned embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the foregoing embodiments illustrate the present invention in detail, those skilled in the art will appreciate that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (6)
1. The utility model provides a fiber grating directional pressure sensor which characterized in that, includes both sides hole optic fibre, bearing plate, atress board and spectral analysis module:
the double-side-hole optical fiber is placed between the bearing plate and the stress plate, and the output end of the double-side-hole optical fiber is connected with the spectral analysis module;
the double-side-hole optical fiber comprises an optical fiber cladding, an optical fiber core and two air holes, wherein the optical fiber core and the two air holes are arranged in the optical fiber cladding;
the diameter of the air hole is larger than that of the fiber core of the optical fiber and smaller than the radius of the fiber cladding;
the double-side-hole optical fiber is used for accessing a measuring beam, and outputting a test beam to the spectrum analysis module after being refracted by the Bragg grating;
the spectrum analysis module is used for demodulating the spectrum of the test light beam to obtain the magnitude and the direction of the force exerted on the stress plate.
2. The fiber grating directional pressure sensor of claim 1, further comprising a double sided hole supporting fiber;
the double-side hole supporting optical fiber and the double-side hole optical fiber are arranged between the bearing plate and the stress plate in parallel.
3. The fiber grating directional pressure sensor of claim 1, wherein the air holes are collinear with the center of the fiber core.
4. The fiber grating directional pressure sensor of claim 1, wherein the bragg grating has a length of 535 um.
5. A fiber grating preparation device is characterized by being applied to preparation of a fiber grating directional pressure sensor and comprising a high-temperature high-pressure reaction kettle, a charge-coupled device image sensor CCD, an ultraviolet laser, a light source, a lens group, a phase mask plate, an electric rotary clamp, a three-dimensional adjusting frame, a PC module and a transmission light analysis module;
the ultraviolet laser, the lens group and the phase mask plate are sequentially connected;
the electric rotary fixture is internally provided with a double-side-hole optical fiber, the electric rotary fixture is arranged on the three-dimensional adjusting frame, and the PC module is arranged on the electric rotary fixture and connected with the CCD;
the phase mask plate is arranged above the double-side-hole optical fiber and focuses light beams on the double-side-hole optical fiber, the transmitted light analysis module is connected with the output end of the double-side-hole optical fiber, and the light source is connected with the input end of the double-side-hole optical fiber;
the high-temperature high-pressure reaction kettle is used for carrying hydrogen on the double-edge hole optical fiber;
the CCD is used for calibrating the directions of the double-side holes;
the ultraviolet laser is used for providing coherent light when writing Bragg grating in the double-side-hole optical fiber;
the lens group is used for processing the coherent light and focusing the coherent light;
the phase mask plate is used for diffracting light beams with different orders to the double-side-hole optical fiber according to the focused coherent light and writing the Bragg grating according to a calibration direction;
the electric rotary clamp is used for fixing the position and the rotating direction of the optical fiber;
the three-dimensional adjusting frame is used for adjusting the positions of the double-side-hole optical fibers;
the PC module is used for displaying CCD imaging and controlling the direction of the electric rotating clamp;
and the transmission light analysis module is used for collecting and analyzing the transmission light signals in the Bragg grating.
6. The apparatus according to claim 5, wherein the lens assembly comprises a mirror, a diaphragm, and a cylindrical lens, which are arranged in this order.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022156298A1 (en) * | 2021-01-25 | 2022-07-28 | 广东海洋大学 | High-sensitivity air pressure sensor based on suspended-core optical fiber and side-hole optical fiber |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022156298A1 (en) * | 2021-01-25 | 2022-07-28 | 广东海洋大学 | High-sensitivity air pressure sensor based on suspended-core optical fiber and side-hole optical fiber |
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