CN114136349A - High-temperature-resistant Bragg fiber grating sensor with variable sensing quantity and preparation method thereof - Google Patents
High-temperature-resistant Bragg fiber grating sensor with variable sensing quantity and preparation method thereof Download PDFInfo
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- CN114136349A CN114136349A CN202111357737.5A CN202111357737A CN114136349A CN 114136349 A CN114136349 A CN 114136349A CN 202111357737 A CN202111357737 A CN 202111357737A CN 114136349 A CN114136349 A CN 114136349A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/268—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light using optical fibres
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35306—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement
- G01D5/35309—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using multiple waves interferometer
- G01D5/35316—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using multiple waves interferometer using a Bragg gratings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/36—Forming the light into pulses
- G01D5/38—Forming the light into pulses by diffraction gratings
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
- G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
- G02B6/02195—Refractive index modulation gratings, e.g. Bragg gratings characterised by means for tuning the grating
- G02B6/022—Refractive index modulation gratings, e.g. Bragg gratings characterised by means for tuning the grating using mechanical stress, e.g. tuning by compression or elongation, special geometrical shapes such as "dog-bone" or taper
Abstract
The invention discloses a high-temperature-resistant Bragg fiber grating sensor with variable sensing quantity and a preparation method thereof, wherein the sensor comprises a first fiber clamping device, a second fiber clamping device, a sleeve and a metal coated fiber engraved with Bragg grating, wherein the metal coated fiber sequentially passes through the centers of the first fiber clamping device, the sleeve and the second fiber clamping device; the first optical fiber clamping device and the second optical fiber clamping device are connected to two sides of the sleeve respectively in a threaded mode. The sensor of the invention realizes multiple purposes, can measure strain and vibration, can measure temperature, and is suitable for high-temperature environment; the structure of the invention has the advantage of flexibly adjusting the tensile prestress of the optical fiber, so that the measurement range can be changed relatively flexibly when strain or vibration is measured.
Description
Technical Field
The invention belongs to the field of fiber optics and sensors, relates to a fiber grating sensor packaging device and a manufacturing method, and particularly relates to a high-temperature-resistant Bragg fiber grating sensor with variable sensing quantity and a manufacturing method.
Background
The fiber Bragg grating sensor has the advantages of small volume, light weight, wide sensing range, strong anti-electromagnetic interference capability, strong corrosion resistance and the like, can sense physical quantities such as strain, temperature, vibration and the like, and is widely applied to the aspects of aerospace, electric power, bridge engineering and the like. At present, the commercial fiber grating sensor can only work within 350 ℃, but under the application scenes of aerospace, thermal power generation and the like, the temperature is usually higher than 1000 ℃, and the commercial fiber grating sensor cannot be suitable at present. In addition, the measurement physical quantity and the measuring range of the fiber grating sensor are often related to the stretching state of the fiber grating, for example, the strain sensor needs to pre-stretch the fiber grating, and the temperature sensor needs to be in a relaxed state without stretching. However, the existing sensor adopts the modes of gluing or laser welding and the like, the fiber bragg grating is very fragile, and the sensing physical quantity or the range of the fiber bragg grating can not be changed once being packaged.
At present, the reason that the grating sensor cannot resist high temperature mainly comprises two reasons: 1. the grating structure is engraved on the photosensitive fiber by traditional ultraviolet light, and the grating engraved by the method is not high temperature resistant and can be erased at 400 ℃. 2. At present, the fiber grating sensor is packaged by glue, however, most high temperature resistant glue cannot be applied to an environment with the temperature of more than 400 ℃, and the precision of the sensor cannot be guaranteed along with the failure of the glue.
In recent years, the temperature resistance of the regenerated gratings formed by thermal regeneration of Type IIa gratings written by high-energy ultraviolet laser and fiber gratings written by long-pulse ultraviolet laser can reach 700 ℃ and 1000 ℃ respectively. The temperature resistance of the fiber grating engraved by the femtosecond laser can reach 1000 ℃, and the loss is very small. Although the prior art can prepare the high-temperature-resistant fiber grating structure, the packaging problem of the sensor is still not solved, so that the manufacturing of the fiber grating sensor with the temperature of above 400 ℃ is still difficult at present, and the high-temperature-resistant packaging technology becomes the key for manufacturing the high-temperature-resistant fiber grating sensor. In recent years, the laser welding fixing method makes the high-temperature-resistant packaging of the fiber grating sensor possible. A high-temperature fiber grating sensing probe (CN104820261) clamps optical fiber to metal-coated fiber grating by laser heating and deforming stainless steel tube. However, no matter the existing fiber grating sensor packaging technology, no matter gluing, laser welding, heating steel pipe fixing, etc., the methods can be fixed and molded once the sensor is packaged, and the change of sensing physical quantity or sensing range can not be realized by adjusting the packaging state again.
Disclosure of Invention
The invention aims to provide a high-temperature resistant Bragg fiber grating sensor with variable sensing quantity and a preparation method thereof, which overcome the defects in the prior art and realize the advantage of repeated utilization for many times, and the sensor of the invention realizes multiple purposes, can measure strain and vibration, can measure temperature and can be suitable for high temperature of more than 400 ℃; the structure of the invention has the advantage of flexibly adjusting the tensile prestress of the optical fiber, so that the measurement range can be changed relatively flexibly when strain and vibration are measured.
In order to achieve the purpose, the invention adopts the following technical scheme:
the high-temperature-resistant Bragg optical fiber grating sensor with variable sensing quantity comprises a first optical fiber clamping device, a second optical fiber clamping device, a sleeve and a metal-coated optical fiber engraved with a Bragg grating, wherein the metal-coated optical fiber sequentially passes through the centers of the first optical fiber clamping device, the sleeve and the second optical fiber clamping device; the first optical fiber clamping device and the second optical fiber clamping device are connected to two sides of the sleeve respectively in a threaded mode;
the first optical fiber clamping device comprises a first chuck and a first nut, wherein one end of the first chuck is connected with the first nut through threads, and the other end of the first chuck is connected with the sleeve through threads;
the second optical fiber clamping device comprises a second chuck and a second nut, one end of the second chuck is in threaded connection with the second nut, and the other end of the second chuck is in threaded connection with the sleeve.
Furthermore, the first chuck comprises a middle section, one end of the middle section comprises a first cylindrical section, the free end of the first cylindrical section is a first circular truncated cone section, the first circular truncated cone section is a clamping part for clamping the metal coated optical fiber, and an external thread matched with a first nut is arranged on the outer side of the first cylindrical section; the other end of interlude is the second cylinder section, the outside of second cylinder section is provided with the external screw thread with sleeve one end complex.
Further, the outside symmetry of interlude is provided with first groove and second groove, the outside symmetry of first nut is provided with third groove and fourth groove.
Furthermore, the second chuck comprises a third cylindrical section, one end of the third cylindrical section is provided with an internal thread matched with the other end of the sleeve, the other end of the third cylindrical section comprises a fourth cylindrical section, the free end of the fourth cylindrical section is a second circular truncated cone section, the second circular truncated cone section is a clamping part used for clamping the metal coated optical fiber, and an external thread matched with a second nut is arranged on the outer side of the fourth cylindrical section.
Furthermore, a fifth groove and a sixth groove are symmetrically arranged on the outer side of the third cylindrical section, and a seventh groove and an eighth groove are symmetrically arranged on the outer side of the second nut.
The preparation method of the high-temperature resistant Bragg fiber grating sensor with variable sensing quantity comprises the following steps:
the method comprises the following steps: the fiber grating is engraved on the metal coating optical fiber, or after the fiber grating is engraved on the common coating optical fiber, the two ends of the engraved Bragg grating are used for plating metal nickel, gold or silver at a subsequent fixed position to form the fiber grating with the metal coating;
step two: taking a first pipe and a second pipe, turning a thread pre-drilled hole and an internal conical surface in the first pipe and the second pipe, and cutting an internal thread in the thread pre-drilled hole to respectively manufacture a first nut and a second nut;
step three: taking a first cylindrical block and a second cylindrical block, turning a conical surface structure and external threads matched with the internal threads of a first nut and a second nut at one end of the first cylindrical block and one end of the second cylindrical block, milling a chuck inner hole at the other end of the first cylindrical block, then turning external threads matched with the internal threads of a sleeve to obtain a first chuck, milling a chuck inner hole at the other end of the second cylindrical block, then turning internal threads matched with the external threads of the sleeve to obtain a second chuck;
step four: turning a section of thick inner hole and a section of thin inner hole in a third cylindrical block, wherein the thick inner hole and the thin inner hole penetrate through the third cylindrical block, turning external threads outside the thin inner hole, and drilling internal threads in the thick inner hole to form a sleeve;
step five: sequentially enabling the metal-coated optical fiber to pass through the centers of the first optical fiber clamping device, the sleeve and the second optical fiber clamping device; and respectively connecting the first optical fiber clamping device and the second optical fiber clamping device to the two sides of the sleeve in a threaded manner, thus obtaining the high-temperature-resistant Bragg optical fiber grating sensor with variable sensing quantity.
Further, after the internal thread is cut in the thread pre-drilling hole in the second step, a pair of symmetrical grooves are cut on the outer surface by adopting a linear cutting method, and a first nut and a second nut are respectively manufactured.
And further, in the third step, milling an inner hole of the chuck at the other end of the first cylindrical block, turning an external thread matched with the internal thread of the sleeve, cutting a pair of symmetrical grooves on the outer surface and a cross gap at the end part in a linear cutting mode to obtain a first chuck, milling an inner hole of the chuck at the other end of the second cylindrical block, turning an internal thread matched with the external thread of the sleeve, and cutting a pair of symmetrical grooves on the outer surface and a cross gap at the end part in a linear cutting mode to obtain a second chuck.
Compared with the prior art, the invention has the following beneficial technical effects:
the sensor package overcomes the defect that the sensor package in the market can not be recycled, and realizes the advantage of repeated utilization for many times, the sensor with the package structure realizes multiple purposes, and strain and vibration can be measured and temperature can be measured by increasing the tensile state of the fiber bragg grating, and the sensor package is suitable for high-temperature environments; in addition, the structure has the advantage of flexibly adjusting the tensile prestress of the optical fiber, so that the sensing measurement range can be flexibly changed when strain and vibration are measured.
Specifically, the sensor packaging method is convenient to operate, the tensioning degree of the fiber bragg grating can be readjusted after the fixing nut is loosened, so that mutual switching between the temperature sensor and the strain sensor is achieved, the defect that the sensor in the market cannot be adjusted after being packaged is overcome, and the sensor packaging method is reusable packaging. In addition, because of adopting the non-glue encapsulation, the combination of the metal coating optical fiber and the high temperature resistant optical fiber grating can realize the high temperature resistant temperature and strain sensing, the sensor structure realizes the multi-purpose of one device, not only can measure the strain and the vibration, but also can measure the high temperature, and because the structure has the advantage of flexibly adjusting the optical fiber stretching prestress, the sensor structure has the advantage of variable strain and vibration sensing ranges.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a block diagram of a variable sensing volume refractory Bragg fiber grating sensor in accordance with the present invention;
FIG. 2 is a block diagram of a first fiber clamping device of the present invention;
FIG. 3 is a planar view of the structural components of a first fiber clamping device of the present invention;
FIG. 4 is a block diagram of a second fiber clamping device of the present invention;
FIG. 5 is a planar view of the structural components of a second fiber clamping device of the present invention;
fig. 6 is a block diagram of the sleeve of the present invention.
The method comprises the following steps of 1, a first optical fiber clamping device; 2. a second fiber clamping device; 3. a sleeve; 4. a metal-coated optical fiber; 1a, a first chuck; 1b, a first nut; 2a, a second chuck; 2b, a second nut; 1a1, first slot; 1a 2: a second groove; 1b1, third slot; 1b2, fourth slot; 2a1, fifth groove; 2a 2: a sixth groove; 2b1, seventh slot; 2b2, eighth slot.
Detailed Description
Embodiments of the invention are described in further detail below:
referring to fig. 1-6, the high temperature resistant bragg fiber grating sensor with variable sensing quantity comprises a first fiber clamping device 1, a second fiber clamping device 2, a sleeve 3 and a metal coated fiber 4 engraved with a bragg grating, wherein the metal coated fiber 4 sequentially passes through the centers of the first fiber clamping device 1, the sleeve 3 and the second fiber clamping device 2; the first optical fiber clamping device 1 and the second optical fiber clamping device 2 are respectively connected to two sides of the sleeve 3 in a threaded mode.
The first optical fiber clamping device 1 comprises a first chuck 1a and a first nut 1b, one end of the first chuck 1a is connected with the first nut 1b through threads, the other end of the first chuck is connected with the sleeve 3 through threads, the first chuck 1a comprises a middle section, one end of the middle section comprises a first cylindrical section, the free end of the first cylindrical section is a first circular table section, the first circular table section is a clamping part for clamping the metal coated optical fiber 4, and an external thread matched with the first nut 1b is arranged on the outer side of the first cylindrical section; the other end of the middle section is a second cylindrical section, the outer side of the second cylindrical section is provided with an external thread matched with one end of the sleeve 3, the outer side of the middle section is symmetrically provided with a first groove 1a1 and a second groove 1a2, and the outer side of the first nut 1b is symmetrically provided with a third groove 1b1 and a fourth groove 1b 2.
The second optical fiber clamping device 2 comprises a second chuck 2a and a second nut 2b, one end of the second chuck 2a is connected with the second nut 2b through threads, the other end of the second chuck is connected with the sleeve 3 through threads, the second chuck 2a comprises a third cylindrical section, one end of the third cylindrical section is provided with an internal thread matched with the other end of the sleeve 3, the other end of the third cylindrical section comprises a fourth cylindrical section, the free end of the fourth cylindrical section is a second circular table section, the second circular table section is a clamping part used for clamping the metal coated optical fiber 4, an external thread matched with the second nut 2b is arranged on the outer side of the fourth cylindrical section, a fifth groove 2a1 and a sixth groove 2a2 are symmetrically arranged on the outer side of the third cylindrical section, and a seventh groove 2b1 and an eighth groove 2b2 are symmetrically arranged on the outer side of the second nut 2 b.
The technical solutions of the present invention are described below clearly and completely with reference to the following embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The utility model provides a high temperature resistant Bragg fiber grating sensor that sensing quantity is changeable, first optical fiber clamping device 1 and second optical fiber clamping device 2 are fixed with 3 both ends of sleeve with the screw mode respectively, the metal coating optic fibre 4 that will be carved with the Bragg grating passes first optical fiber clamping device 1 in proper order, sleeve 3 and second optical fiber clamping device 2, wherein all there is a conical surface of mutually supporting on chuck and the nut on first optical fiber clamping device 1 and the second optical fiber clamping device 2, when the nut is rotatory to the chuck direction, impel chuck four leafy grass structures to draw close to the centre, thereby tighten metal coating optic fibre 4.
The specific manufacturing method comprises the following steps: plating a layer of metal nickel on the surface of the optical fiber with the Bragg grating by using an electroplating method.
The method comprises the steps of turning a thread pre-drilled hole and a nut internal conical surface in a stainless steel pipe with a proper size by adopting a turning process, using a thread tap to cut an internal thread in the thread pre-drilled hole in a manual or motorized mode, and cutting a pair of symmetrical grooves on the outer surface of a nut by adopting a linear cutting method to manufacture a nut structure.
A turning process is adopted at one end of a stainless steel tube cylindrical block, a conical surface structure and external threads matched with the internal threads of a nut are turned out, an inner hole of a chuck is milled at the other end of the cylindrical block, external (internal) threads matched with the internal (external) threads of a sleeve are turned out, and then a pair of symmetrical grooves on the outer surface of the chuck and a cross-shaped gap on the circular truncated cone part of the chuck are cut out in a linear cutting mode to manufacture the chuck structure.
A section of thick inner hole and a section of thin inner hole are turned inside a stainless steel cylindrical block, the thick inner hole and the thin inner hole penetrate through the whole cylinder, external threads matched with the internal threads of the chuck are turned outside the thin inner hole, a thread tap is used in the thick inner hole, internal threads are drilled out in a manual or motorized mode, and a sleeve structure is manufactured.
The specific assembly comprises the following steps:
1) the first chuck 1a, the second chuck 2a and the sleeve 3 are fixed tightly by screws.
2) The metal-coated optical fiber 4 engraved with the bragg grating is passed through the first collet 1a, the sleeve 3 and the second collet 2a so that the metal-coated optical fiber 4 has the bragg grating inside the sleeve 3.
3) The first nut 1b is screwed to the ferrule 3 and tightened to fix one end of the metal-coated optical fiber 4.
4) If two fixing operations are needed, the metal-coated optical fiber 4 is pre-stretched, then the second screw cap 2b is connected with the sleeve 3 in a threaded mode, and the other end of the metal-coated optical fiber 4 is fixed by screwing;
5) four pairs of grooves on the surface of the optical fiber sensor are fixed on a structure to be measured, and corresponding physical quantities are measured.
The method comprises the steps of firstly writing a high-temperature-resistant fiber grating on a metal-coated optical fiber, then fixing two ends of the fiber grating by adopting a first fiber clamping device and a second fiber clamping device, adjusting the stretching state of the fiber grating, loosening the clamping devices with thread structures when the strain/vibration sensor or the temperature sensor is subjected to high-temperature packaging, readjusting the stretching state of the fiber grating, and realizing the conversion of strain and temperature sensing or changing the sensing range. The structure is simple, the use is flexible, the packaging state can be readjusted for many times in the application, and in addition, the metal coating optical fiber has higher temperature resistance compared with the traditional polymer coating layer, and the non-adhesive process of thread fixing is adopted during the fixing, so that the method can be used for the distributed sensing measurement of strain, vibration and temperature at high temperature.
Example 1
The present embodiment takes the pre-stretching measurement temperature of the optical fiber as an example, and the following details are as follows:
materials: the metal coating optical fiber is carved with Bragg grating.
(1) The metal coating optical fiber 4 engraved with the Bragg grating sequentially passes through the first chuck 1a, the sleeve 3 and the second chuck 2a, and the optical fiber is adjusted to enable the position of the grating to be arranged inside the sleeve 3.
(2) The first and second chucks 1a and 2a and the sleeve 3 are screwed.
(3) The optical fiber passed through the ferrule 3 and the first and second ferrules 1a and 2a is pre-stretched.
(4) The first nut 1b and the first chuck 1a in fig. 2 are screwed and fixed, and the operation method of the fixing is as follows: two wrenches are respectively inserted into the first groove 1a1, the second groove 1a2, the third groove 1b1 and the fourth groove 1b2, and the included angle of the two wrenches is rotated to enable the clover structure of the chuck to clamp one end of the optical fiber.
(5) The second nut 2b and the second chuck 2a in fig. 4 are screwed and fixed, and the operation method of the fixing is as follows: two wrenches are respectively inserted into the first groove 2a1, the second groove 2a2, the third groove 2b1 and the fourth groove 2b2, and the included angle of the two wrenches is rotated to enable the clover structure of the chuck to clamp the other end of the optical fiber.
(6) One end of the optical fiber is connected to the FBG demodulation device, and the optical fiber data acquired by the demodulation device is used for calculating the outside temperature.
(7) When the measuring optical fiber needs to be replaced or the packaging structure needs to be reused, the first nut 1b and the second nut 2b are respectively rotationally detached from the first chuck 1a and the second chuck 2a, the first chuck 1a and the second chuck 2a are rotationally detached from the sleeve 3, the optical fiber is taken out, and then the steps (1) to (6) are repeated.
Example 2
In this embodiment, the fiber relaxation type measurement temperature is taken as an example, and the following is specifically taken:
materials: the metal coating optical fiber is carved with Bragg grating.
(1) And (3) sequentially enabling the metal coating optical fiber 4 engraved with the Bragg grating to pass through the first chuck 1a and the sleeve 3, and adjusting the optical fiber to enable the position of the grating to be arranged in the sleeve 3.
(2) The first and second chucks 1a and 2a and the sleeve 3 are screwed.
(3) The first nut 1b and the first chuck 1a in fig. 2 are screwed and fixed, and the operation method of the fixing is as follows: two wrenches are respectively inserted into the first groove 1a1, the second groove 1a2, the third groove 1b1 and the fourth groove 1b2, and the included angle of the two wrenches is rotated to enable the clover structure of the chuck to clamp one end of the optical fiber.
(4) The second nut 2b of fig. 4 is screwed and fixed to the second chuck 2 a.
(5) And (3) connecting one end of the optical fiber to the FBG demodulation device, and processing the optical fiber data acquired by the demodulation device so as to calculate the external temperature.
(6) When the measuring optical fiber needs to be replaced or the packaging structure needs to be reused, the first nut 1b and the second nut 2b are respectively rotationally detached from the first chuck 1a and the second chuck 2a, the first chuck 1a and the second chuck 2a are rotationally detached from the sleeve 3, the optical fiber is taken out, and then the steps (1) - (4) are repeated.
Example 3
The present embodiment takes the strain measurement in the optical fiber pre-stretching mode as an example, and the details are as follows:
materials: the metal coating optical fiber is carved with Bragg grating.
(1) And sequentially enabling the metal coated optical fiber 4 engraved with the Bragg grating to pass through the first chuck 1a, the sleeve 3 and the second chuck 2a, and adjusting the optical fiber to enable the position of the grating to be arranged in the sleeve.
(2) The first and second chucks 1a and 2a and the sleeve 3 are screwed.
(3) The optical fiber passed through the ferrule 3 and the first and second ferrules 1a and 2a is pre-stretched.
(4) The first nut 1b and the first chuck 1a in fig. 2 are screwed and fixed, and the operation method of the fixing is as follows: two wrenches are respectively inserted into the first groove 1a1, the second groove 1a2, the third groove 1b1 and the fourth groove 1b2, and the included angle of the two wrenches is rotated to enable the clover structure of the chuck to clamp one end of the optical fiber.
(5) The second nut 2b and the second chuck 2a in fig. 4 are screwed and fixed, and the operation method of the fixing is as follows: two wrenches are respectively inserted into the first groove 2a1, the second groove 2a2, the third groove 2b1 and the fourth groove 2b2, and the included angle of the two wrenches is rotated to enable the clover structure of the chuck to clamp the other end of the optical fiber.
(6) The first groove 1a1, the second groove 1a2, the fifth groove 2a1 and the sixth groove 2a2 are fixed with an object to be measured by using a bolt type, and the matching mode is interference fit.
(7) One end of the optical fiber is connected to the FBG demodulation device, and the optical fiber data acquired by the demodulation device is used for calculating the axial strain of the object to be measured.
(8) When the measuring optical fiber needs to be replaced or the packaging structure needs to be reused, the first nut 1b and the second nut 2b are respectively rotationally detached from the first chuck 1a and the second chuck 2a, the first chuck 1a and the second chuck 2a are rotationally detached from the sleeve 3, the optical fiber is taken out, and then the steps (1) - (7) are repeated.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. The high-temperature-resistant Bragg optical fiber grating sensor with variable sensing quantity is characterized by comprising a first optical fiber clamping device (1), a second optical fiber clamping device (2), a sleeve (3) and a metal-coated optical fiber (4) carved with a Bragg grating, wherein the metal-coated optical fiber (4) sequentially passes through the centers of the first optical fiber clamping device (1), the sleeve (3) and the second optical fiber clamping device (2); the first optical fiber clamping device (1) and the second optical fiber clamping device (2) are connected to the two sides of the sleeve (3) in a threaded mode respectively;
the first optical fiber clamping device (1) comprises a first chuck (1a) and a first nut (1b), one end of the first chuck (1a) is connected with the first nut (1b) through threads, and the other end of the first chuck is connected with the sleeve (3) through threads;
the second optical fiber clamping device (2) comprises a second chuck (2a) and a second nut (2b), one end of the second chuck (2a) is connected with the second nut (2b) through threads, and the other end of the second chuck is connected with the sleeve (3) through threads.
2. The sensing variable refractory fiber bragg grating sensor according to claim 1, wherein the first chuck (1a) comprises an intermediate section, one end of the intermediate section comprises a first cylindrical section, the free end of the first cylindrical section is a first circular truncated cone section, the first circular truncated cone section is a clamping part for clamping the metal coated optical fiber (4), and the outer side of the first cylindrical section is provided with an external thread matched with a first nut (1 b); the other end of the middle section is a second cylindrical section, and an external thread matched with one end of the sleeve (3) is arranged on the outer side of the second cylindrical section.
3. The FBG sensor according to claim 2, wherein the middle section is symmetrically provided with a first groove (1a1) and a second groove (1a2) on the outer side, and the first nut (1b) is symmetrically provided with a third groove (1b1) and a fourth groove (1b2) on the outer side.
4. The FBG sensor with variable sensing quantity according to claim 2, characterized in that the second chuck (2a) comprises a third cylindrical section, one end of which is provided with an internal thread which is matched with the other end of the sleeve (3), and the other end of which comprises a fourth cylindrical section, the free end of which is a second circular truncated cone section, the second circular truncated cone section is a clamping part used for clamping the metal coated optical fiber (4), and the outer side of the fourth cylindrical section is provided with an external thread which is matched with a second screw cap (2 b).
5. The FBG sensor according to claim 4, wherein the third cylindrical section is symmetrically provided with a fifth groove (2a1) and a sixth groove (2a2) on the outer side, and the second nut (2b) is symmetrically provided with a seventh groove (2b1) and an eighth groove (2b2) on the outer side.
6. The method for manufacturing a variable sensing amount refractory bragg fiber grating sensor as claimed in claim 1, comprising the steps of:
the method comprises the following steps: the fiber grating is engraved on the metal coating optical fiber, or after the fiber grating is engraved on the common coating optical fiber, the two ends of the engraved Bragg grating are used for plating metal nickel or gold or silver at a subsequent fixed position to form the fiber grating (4) with the metal coating;
step two: taking a first pipe and a second pipe, turning a thread pre-drilled hole and an internal conical surface in the first pipe and the second pipe, and cutting an internal thread in the thread pre-drilled hole to respectively manufacture a first nut (1b) and a second nut (2 b);
step three: taking a first cylindrical block and a second cylindrical block, turning a conical surface structure and external threads matched with the internal threads of a first nut (1b) and a second nut (2b) at one ends of the first cylindrical block and the second cylindrical block, milling a chuck inner hole at the other end of the first cylindrical block, turning external threads matched with the internal threads of a sleeve (3) to obtain a first chuck (1a), and milling a chuck inner hole at the other end of the second cylindrical block, turning internal threads matched with the external threads of the sleeve (3) to obtain a second chuck (2 a);
step four: turning a section of thick inner hole and a section of thin inner hole in a third cylindrical block, wherein the thick inner hole and the thin inner hole penetrate through the third cylindrical block, turning external threads outside the thin inner hole, and drilling internal threads in the thick inner hole to form a sleeve (3);
step five: sequentially enabling the metal coated optical fiber (4) to pass through the centers of the first optical fiber clamping device (1), the sleeve (3) and the second optical fiber clamping device (2); and (3) connecting the first optical fiber clamping device (1) and the second optical fiber clamping device (2) to two sides of the sleeve (3) in a threaded manner respectively to obtain the high-temperature-resistant Bragg optical fiber grating sensor with variable sensing quantity.
7. The method for manufacturing the refractory bragg grating sensor with variable sensing amount according to claim 6, wherein after the internal thread is cut in the pre-drilled hole, a pair of symmetrical grooves are cut on the outer surface by a wire cutting method to respectively manufacture the first nut (1b) and the second nut (2 b).
8. The method for manufacturing the high temperature resistant Bragg fiber grating sensor with variable sensing quantity according to claim 6, wherein in the third step, an inner chuck hole is milled at the other end of the first cylindrical block, an external thread matched with the internal thread of the sleeve (3) is turned, then a pair of symmetrical grooves of the outer surface and a cross gap of the end part are cut by adopting a wire cutting mode to obtain the first chuck (1a), an inner chuck hole is milled at the other end of the second cylindrical block, an internal thread matched with the external thread of the sleeve (3) is turned, and then a pair of symmetrical grooves of the outer surface and a cross gap of the end part are cut by adopting a wire cutting mode to obtain the second chuck (2 a).
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Cited By (1)
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| CN116818025A (en) * | 2023-08-31 | 2023-09-29 | 武汉理工大学 | Step metal coating fiber bragg grating high-temperature vibration composite sensor and monitoring method |
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