CN111562031A - Fiber grating temperature sensor, array and array forming method thereof - Google Patents
Fiber grating temperature sensor, array and array forming method thereof Download PDFInfo
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- CN111562031A CN111562031A CN202010468166.1A CN202010468166A CN111562031A CN 111562031 A CN111562031 A CN 111562031A CN 202010468166 A CN202010468166 A CN 202010468166A CN 111562031 A CN111562031 A CN 111562031A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
- G01K11/3206—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres at discrete locations in the fibre, e.g. using Bragg scattering
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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
- G02B6/02123—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating
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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
- G02B6/02123—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating
- G02B6/02133—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating using beam interference
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Abstract
The fiber grating is used as a sensitive element, a capillary quartz glass tube and an inner protection tube are used for packaging and protecting the fiber grating, and meanwhile, the process of calibrating firstly and then forming the array is utilized, so that the problems of strain of the fiber grating array during suspension placement and the problem that laboratory calibration is not matched with field application conditions are solved, and the fiber grating temperature sensor array has a better application prospect in environments such as cloud rooms where temperature profiles in the vertical direction need to be measured. The sensor array is protected by the inner thread and the outer thread of the outer protection tube, the array forming process of different numbers of sensors can be realized by adjusting the length and the number of the outer protection tubes, and the measurement of the cloud chamber temperature profile is completed.
Description
Technical Field
The invention relates to the technical field of fiber grating temperature sensors, in particular to a fiber grating temperature sensor, an array and an array forming method thereof.
Background
As a low-temperature device for simulating physical experiments under cloud and mist conditions, a cloud chamber is always a reaction device in the field of physical experiments, particularly high-energy physical research, and temperature is a crucial parameter for the cloud chamber. The characteristics of the working space of the cloud chamber cause that a larger temperature gradient exists in the vertical direction, the temperature needs to be effectively monitored in real time before the high-energy physical reaction starts and in the reaction process, the high-energy particles filled in the cloud chamber limit the temperature measuring equipment, and the optical fiber temperature sensor becomes an effective detection device in the field with the advantages that the optical fiber temperature sensor is not subjected to electromagnetic interference and the like.
In the optical fiber type sensor, a sensor based on an optical fiber grating is a common device, wherein the manufacture of the I type optical fiber grating is completed by writing an optical fiber subjected to hydrogen loading treatment by ultraviolet light, the optical fiber grating is an ideal filtering element, an optical signal returned by the optical fiber grating generally only contains light with a specific wavelength, and the wavelength is the central wavelength of the optical fiber grating. When the outside temperature changes, the central wavelength of the fiber grating can timely feedback, when the temperature rises, the wavelength moves to the long wave direction, and the wavelength temperature coefficient of the common grating is 10 pm/DEG C. Currently, fiber grating temperature sensors are widely used in various fields such as ocean, petroleum and underground space for temperature measurement.
In the measurement of the cloud chamber temperature profile, the fiber grating temperature sensor has obvious advantages such as no electromagnetic interference, quick response and the like. Generally, the fiber grating temperature sensor can be calibrated before field practical application, the calibration process is generally carried out in a baking oven or an oil groove with constant temperature horizontally, such calibration result is only suitable for the environment of horizontal placement and use in principle, but the height of a cloud chamber generally exceeds 10 meters, the fiber grating temperature sensor is placed in a suspension manner, the dead weight of the fiber grating temperature sensor is increased through a certain packaging process, the topmost fiber grating can be stretched to cause strain to a great extent, the central wavelength of the fiber grating can be moved by the strain, the temperature demodulation is influenced, and the application of the fiber grating temperature sensor in vertical environments such as the cloud chamber is seriously influenced.
Disclosure of Invention
The invention aims to provide a fiber grating temperature sensor. Another object of the present invention is to provide a fiber grating temperature sensor array. Another object of the present invention is to provide an array method of the fiber grating temperature sensor array.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a fiber grating temperature sensor comprises a single mode fiber, a capillary quartz glass tube and an inner protection tube;
the single mode fiber is provided with a fiber grating;
the single-mode optical fiber passes through the capillary quartz glass tube, and a fiber grating on the single-mode optical fiber is positioned in the capillary quartz glass tube;
the inner protection tube is sleeved and wrapped with the capillary quartz glass tube;
two ends of the single-mode optical fiber in length are respectively exposed out of two axial ends of the capillary quartz glass tube, and two ends of the single-mode optical fiber in length are respectively exposed out of two axial ends of the inner protection tube;
the top tube opening of the capillary quartz glass tube is filled with sealant for fixing the single mode fiber at the top tube opening of the capillary quartz glass tube by gluing through the sealant, and the bottom tube opening of the capillary quartz glass tube is filled with sealant for fixing the single mode fiber at the bottom tube opening of the capillary quartz glass tube by gluing through the sealant;
the utility model discloses a capillary quartz glass tube, including inner protection tube, single mode fiber, capillary quartz glass tube, sealed glue in the top mouth of pipe of inner protection tube is filled with in order to be used for with single mode fiber is through sealed glue adhesive fixation the top mouth of pipe department of inner protection tube and with the top mouth of pipe of inner protection tube with the gluey adhesion of top mouth of pipe of capillary quartz glass tube connects, be filled with in the end mouth of pipe of inner protection tube sealed glue adhesive fixation with single mode fiber in the end mouth of pipe department of inner protection tube and with the end mouth of pipe of inner protection tube with.
Preferably, the single-mode optical fiber is a single-mode communication fiber G652. D.
Preferably, the sealant is an epoxy resin adhesive.
Preferably, the inner protection tube is a stainless steel tube.
A fiber bragg grating temperature sensor array comprises at least 2 fiber bragg grating temperature sensors, an outer protection tube and a plastic hose;
the fiber grating temperature sensor is any one of the fiber grating temperature sensors;
the fiber grating temperature sensor array is formed by connecting at least 2 fiber grating temperature sensors in series;
the exposed tail fiber of one fiber grating temperature sensor is welded with the exposed tail fiber of the other adjacent fiber grating temperature sensor by a welding machine so as to connect the two adjacent fiber grating temperature sensors in series;
all the fiber bragg grating temperature sensors are arranged in the order of the central wavelength of the fiber bragg grating from small to large or from large to small;
the plastic hose is sleeved and wrapped on the welding points of two adjacent single-mode optical fibers so as to protect the welding points;
the fiber bragg grating temperature sensor and the plastic hose which are connected in series are positioned in the outer protection pipe, and the fiber bragg grating temperature sensor and the plastic hose which are connected in series are sleeved and wrapped on the outer protection pipe;
and a glue injection through hole is formed in the pipe wall of the outer protection pipe, and glue is injected into the outer protection pipe through the glue injection through hole so as to be used for fixing the single-mode optical fiber and the fiber bragg grating temperature sensor on the pipe wall of the outer protection pipe in an adhesive manner.
An array forming method of the fiber grating temperature sensor array comprises the following steps of:
1) the preparation method of the fiber grating temperature sensor comprises the following steps of:
a) firstly, utilizing hydrogen-carrying and ultraviolet photoetching writing to make optical fiber grating with target central wavelength on single-mode optical fiber;
b) the fiber bragg grating on the single-mode fiber is wrapped by the capillary quartz glass tube sleeve, then sealant is filled into the top tube opening and the bottom tube opening of the capillary quartz glass tube respectively, and then the sealant in the capillary quartz glass tube is solidified into a solid;
c) sheathing and wrapping the capillary quartz glass tube by using the inner protection tube, filling sealant into a top tube opening and a bottom tube opening of the inner protection tube respectively, and solidifying the sealant in the inner protection tube into a solid;
2) carrying out temperature calibration on each fiber bragg grating temperature sensor;
3) the fiber bragg grating temperature sensors after temperature calibration are welded to be connected in series to form an array;
4) and 3) packaging the serially connected fiber bragg grating temperature sensor prepared in the step 3) by using an outer protection tube.
Preferably, the grating region length of the fiber grating is 12mm, and the reflectivity is more than 95%;
the fiber grating temperature sensor array comprises 5-20 fiber grating temperature sensors, each fiber grating temperature sensor comprises a fiber grating, the difference of the central wavelengths of two adjacent fiber gratings is 2.4nm or integral multiple of 2.4nm, and the central wavelength of any fiber grating is within a band of 1533nm-1564 nm.
Preferably, the outer protection tube is a stainless steel tube;
the outer protection tube divide into the multistage, and the axial one end of every section outer protection tube is provided with the external screw thread, and the axial other end of every section outer protection tube is provided with the internal thread, and two sections adjacent outer protection tubes pass through external screw thread and internal screw thread cooperation constitution threaded connection.
Preferably, the capillary quartz glass tube has an outer diameter of 0.5mm and an inner diameter of 0.4mm and a length of 20 mm;
the outer diameter of the inner protection tube is 1.5mm, the inner diameter of the inner protection tube is 1mm, and the length of the inner protection tube is 30 mm;
the outer diameter of the outer protection tube is 5mm, the inner diameter of the outer protection tube is 3.5mm, and the length of each section of the outer protection tube is 0.5 m;
the plastic hose has an inner diameter of 0.4mm and an outer diameter of 0.9 mm.
The invention has the beneficial effects that:
1) the invention adopts a plurality of self-written optical fiber gratings with different central wavelengths as temperature sensing units, the protection of grating sensitive elements is carried out through a capillary quartz glass tube and an inner protection tube, the temperature calibration is carried out on the protected optical fiber gratings, the grating elements are arrayed after the fusion points of the optical fibers are protected by a PVC plastic hose, and the arrayed bare optical fibers are cabled by an outer protection tube with larger diameter. The fiber grating temperature sensor array packaged and manufactured by the invention can be hung for carrying out temperature profile measurement in the vertical direction, and meanwhile, the array forming process can solve the problem that the conventional horizontal calibration result is not applicable to the fiber grating temperature sensor array which is vertically hung and influenced by gravity, overcomes the severe requirement of the calibration process on the environment, and widens the application environment of the fiber grating temperature sensor.
2) In the invention, the capillary quartz glass tube and the inner protection tube are used for packaging and protecting, and the possibility of deformation of the grating area caused by gravity is reduced or even eliminated to a certain extent by fixing the grating tail fiber, so that the strain problem of the fiber grating temperature sensor array in the suspension placement and the phenomenon that the laboratory calibration is not consistent with the field application condition are avoided, and the fiber grating temperature sensor array has better application prospect in the environment needing to measure the vertical temperature profile, such as a cloud room and the like.
3) Compared with the conventional fiber bragg grating temperature sensor in a cloud chamber and an array process thereof, the fiber bragg grating temperature sensor disclosed by the invention utilizes the fiber bragg grating as a sensitive element, and simultaneously utilizes the process of calibrating firstly and then forming the array, and solves the problem that the laboratory calibration and the field application result of the conventional fiber bragg grating temperature sensor are inconsistent by respectively fixing the gratings of the single fiber bragg grating temperature sensor.
4) According to the cloud chamber temperature profile measuring device, the sensor array is protected by means of connection of the inner threads and the outer threads of the outer protection tubes, and the array forming process of different numbers of sensors can be achieved by adjusting the length and the number of the outer protection tubes according to actual requirements of the cloud chamber, so that the cloud chamber temperature profile is measured.
Drawings
Fig. 1 is a schematic cross-sectional structural diagram of an array of fiber grating temperature sensors when step 3) is completed according to an embodiment of the present invention (in view of limited page size, only 3 fiber grating temperature sensors are shown in fig. 1);
fig. 2 is a schematic cross-sectional structural diagram of the fiber grating temperature sensor array after the step 4) in fig. 1 is completed.
In the figure: 1 single mode fiber, 101 fiber grating;
2, a capillary quartz glass tube, 3, an inner protection tube and 4, sealing glue;
5 plastic hose, 6 outer protection tubes, 601 internal thread, 602 external thread, 603 glue injection through hole.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "central," "axial," "radial," "longitudinal," "transverse," "length," "width," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "vertical," "horizontal," and the like are used in the orientations and positional relationships indicated in the drawings to facilitate the description of the invention and to simplify the description, but do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the invention.
In the present invention, unless otherwise expressly stated or limited, the first feature being "on" or "under" the second feature may comprise the first and second features being in direct contact, or the first and second features being in contact, not directly, but via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
As shown in fig. 1 to fig. 2, fig. 1 is a schematic cross-sectional structural diagram of a fiber grating temperature sensor array when step 3) provided by the embodiment of the present invention is completed (in view of limited page size, only 3 fiber grating temperature sensors are shown in fig. 1); fig. 2 is a schematic cross-sectional structural diagram of the fiber grating temperature sensor array after the step 4) in fig. 1 is completed.
The application provides a fiber bragg grating temperature sensor, which comprises a single-mode fiber 1, a capillary quartz glass tube 2 and an inner protection tube 3;
the single mode fiber 1 is provided with a fiber grating 101;
the single-mode optical fiber 1 passes through the capillary quartz glass tube 2, and the fiber grating 101 on the single-mode optical fiber 1 is positioned in the capillary quartz glass tube 2;
the inner protection tube 3 is sleeved and wrapped with the capillary quartz glass tube 2;
two ends of the single-mode optical fiber 1 are respectively exposed out of two axial ends of the capillary quartz glass tube 2, and two ends of the single-mode optical fiber 1 are respectively exposed out of two axial ends of the inner protection tube 3;
the top tube opening of the capillary quartz glass tube 2 is filled with a sealant 4 for adhesively fixing the single mode fiber 1 at the top tube opening of the capillary quartz glass tube 2 through the sealant 4, and the bottom tube opening of the capillary quartz glass tube 2 is filled with the sealant 4 for adhesively fixing the single mode fiber 1 at the bottom tube opening of the capillary quartz glass tube 2 through the sealant 4;
In an embodiment of the present application, the single-mode optical fiber 1 is a single-mode communication fiber g652. d.
In one embodiment of the present application, the sealant 4 is an epoxy resin adhesive.
In one embodiment of the present application, the inner protection tube 3 is a stainless steel tube.
The application also provides a fiber grating temperature sensor array, which comprises at least 2 fiber grating temperature sensors, an outer protection tube 6 and a plastic hose 5;
the fiber grating temperature sensor is any one of the fiber grating temperature sensors;
the fiber grating temperature sensor array is formed by connecting at least 2 fiber grating temperature sensors in series;
the exposed tail fiber of one fiber grating temperature sensor is welded with the exposed tail fiber of the other adjacent fiber grating temperature sensor by a welding machine so as to connect the two adjacent fiber grating temperature sensors in series;
all the fiber bragg grating temperature sensors are arranged in the order of the central wavelength of the fiber bragg grating 101 from small to large or from large to small;
the plastic hose 5 is sleeved and wrapped on the welding points of two adjacent single-mode optical fibers 1 so as to protect the welding points;
the fiber bragg grating temperature sensor and the plastic hose 5 which are connected in series are positioned in the outer protection tube 6, and the fiber bragg grating temperature sensor and the plastic hose 5 which are connected in series are sleeved and wrapped on the outer protection tube 6;
the pipe wall of the outer protection pipe 6 is provided with a glue injection through hole 603, glue is injected into the outer protection pipe 6 through the glue injection through hole 603, and the single-mode optical fiber 1 and the fiber bragg grating temperature sensor are fixed on the pipe wall of the outer protection pipe 6 in an adhesive mode.
The application also provides an array forming method of the fiber grating temperature sensor array, which comprises the following steps of:
1) the preparation method of the fiber grating temperature sensor comprises the following steps of:
a) firstly, utilizing hydrogen-carrying and ultraviolet photoetching writing to manufacture a fiber grating 101 with a target central wavelength on a single-mode fiber 1;
b) sleeving and wrapping the fiber bragg grating 101 on the single-mode fiber 1 by using the capillary quartz glass tube 2, filling the sealant 4 into the top tube opening and the bottom tube opening of the capillary quartz glass tube 2 respectively, and curing the sealant 4 in the capillary quartz glass tube 2 into a solid;
c) sheathing and wrapping the capillary quartz glass tube 2 by using the inner protection tube 3, filling sealant 4 into a top tube opening and a bottom tube opening of the inner protection tube 3 respectively, and then curing the sealant 4 in the inner protection tube 3 into a solid;
2) carrying out temperature calibration on each fiber bragg grating temperature sensor;
3) the fiber bragg grating temperature sensors after temperature calibration are welded to be connected in series to form an array;
4) and 3) packaging the serially connected fiber bragg grating temperature sensor prepared in the step 3) by using an outer protection tube 6.
In one embodiment of the present application, the grating region length of the fiber grating 101 is 12mm, and the reflectivity is greater than 95%;
the fiber grating temperature sensor array comprises 5-20 fiber grating temperature sensors, each fiber grating temperature sensor comprises a fiber grating 101, the difference of the central wavelengths of two adjacent fiber gratings 101 is 2.4nm or integral multiple of 2.4nm, and the central wavelength of any one fiber grating 101 is within a band of 1533nm-1564 nm.
In one embodiment of the present application, the outer protective tube 6 is a stainless steel tube;
the outer protection tube 6 is divided into a plurality of sections, an external thread 602 is arranged at one axial end of each section of the outer protection tube 6, an internal thread 601 is arranged at the other axial end of each section of the outer protection tube 6, and two adjacent sections of the outer protection tubes 6 are in threaded connection through the matching of the external thread 602 and the internal thread 601.
In one embodiment of the present application, the capillary quartz glass tube 2 has an outer diameter of 0.5mm and an inner diameter of 0.4mm and a length of 20 mm;
the outer diameter of the inner protection tube 3 is 1.5mm, the inner diameter is 1mm, and the length is 30 mm;
the outer diameter of the outer protection pipe 6 is 5mm, the inner diameter of the outer protection pipe is 3.5mm, and the length of each section of the outer protection pipe 6 is 0.5 m;
the plastic hose 5 has an inner diameter of 0.4mm and an outer diameter of 0.9 mm.
The fiber bragg grating 101 is a grating which is inscribed on a single-mode fiber 1G652.D, the length of a grating region of the fiber bragg grating 101 is 12mm, the reflectivity is larger than 95%, appropriate wavelengths are selected according to the standard of the International Telecommunication Union (ITU), the wavelengths are ensured to be within a demodulation range, overlapping of central wavelengths cannot occur in the temperature change process, sometimes, in order to meet the requirement of the number of cloud room temperature test points, one path of sensor can be divided into a plurality of arrays, and each array utilizes one demodulation channel to realize multipoint temperature monitoring.
The fiber bragg grating 101 is placed in the capillary quartz glass tube 2 and then fixed by epoxy resin glue, in order to prevent the fiber bragg grating 101 from being strained by the influence of gravity, the fiber bragg grating 101 should be bent or not pulled in the capillary quartz glass tube 2 as much as possible, and then the fiber bragg grating 101 together with the capillary quartz glass tube 2 is packaged into the inner protection tube 3.
After the capillary quartz glass tube 2 and the inner protection tube 3 are protected by the arrayed fiber grating temperature sensors, temperature calibration can be completed together, the fiber grating temperature sensors are connected into a demodulator installed and used on site in the calibration process to ensure the consistency of data, and the calibrated temperature range is determined according to requirements.
Because the calibration of the fiber grating temperature sensor generally adopts a constant-temperature oil tank or a high-temperature oven, the sensor grating is in a free state without being pulled in the calibration process, and in the practical application process of the cloud chamber, the sensor has a certain weight after being packaged by a metal piece or a stainless steel pipe, particularly, the topmost sensor can be in a tensile state due to large pulling force, and the central wavelength moves under the influence of strain, so that the temperature demodulation is inaccurate. In order to solve the above problems, the present invention performs encapsulation protection before the temperature calibration of the fiber grating temperature sensor, and performs dispensing and fixing after the fiber grating 101 is in a free state.
In the array process, the fiber bragg gratings 101 are arranged in the order of the wavelengths from small to large or from large to small, so that the demodulation result of the demodulator corresponds to the actual spatial position, different fiber bragg grating temperature sensors are welded by a welding machine, and finally a plurality of fiber bragg grating temperature sensors are arrayed on one optical fiber.
Methods and devices not described in detail in the present invention are all the prior art and are not described in detail.
The principles and embodiments of the present invention are explained herein using specific examples, which are set forth only to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (9)
1. The fiber bragg grating temperature sensor is characterized by comprising a single-mode fiber, a capillary quartz glass tube and an inner protection tube;
the single mode fiber is provided with a fiber grating;
the single-mode optical fiber passes through the capillary quartz glass tube, and a fiber grating on the single-mode optical fiber is positioned in the capillary quartz glass tube;
the inner protection tube is sleeved and wrapped with the capillary quartz glass tube;
two ends of the single-mode optical fiber in length are respectively exposed out of two axial ends of the capillary quartz glass tube, and two ends of the single-mode optical fiber in length are respectively exposed out of two axial ends of the inner protection tube;
the top tube opening of the capillary quartz glass tube is filled with sealant for fixing the single mode fiber at the top tube opening of the capillary quartz glass tube by gluing through the sealant, and the bottom tube opening of the capillary quartz glass tube is filled with sealant for fixing the single mode fiber at the bottom tube opening of the capillary quartz glass tube by gluing through the sealant;
the utility model discloses a capillary quartz glass tube, including inner protection tube, single mode fiber, capillary quartz glass tube, sealed glue in the top mouth of pipe of inner protection tube is filled with in order to be used for with single mode fiber is through sealed glue adhesive fixation the top mouth of pipe department of inner protection tube and with the top mouth of pipe of inner protection tube with the gluey adhesion of top mouth of pipe of capillary quartz glass tube connects, be filled with in the end mouth of pipe of inner protection tube sealed glue adhesive fixation with single mode fiber in the end mouth of pipe department of inner protection tube and with the end mouth of pipe of inner protection tube with.
2. The fiber grating temperature sensor according to claim 1, wherein the single-mode fiber is a single-mode communication fiber G652. D.
3. The fiber grating temperature sensor of claim 1, wherein the sealant is an epoxy glue.
4. The fiber grating temperature sensor according to claim 1, wherein the inner protection tube is a stainless steel tube.
5. The fiber bragg grating temperature sensor array is characterized by comprising at least 2 fiber bragg grating temperature sensors, an outer protection tube and a plastic hose;
the fiber grating temperature sensor is the fiber grating temperature sensor of any one of claims 1 to 4;
the fiber grating temperature sensor array is formed by connecting at least 2 fiber grating temperature sensors in series;
the exposed tail fiber of one fiber grating temperature sensor is welded with the exposed tail fiber of the other adjacent fiber grating temperature sensor by a welding machine so as to connect the two adjacent fiber grating temperature sensors in series;
all the fiber bragg grating temperature sensors are arranged in the order of the central wavelength of the fiber bragg grating from small to large or from large to small;
the plastic hose is sleeved and wrapped on the welding points of two adjacent single-mode optical fibers so as to protect the welding points;
the fiber bragg grating temperature sensor and the plastic hose which are connected in series are positioned in the outer protection pipe, and the fiber bragg grating temperature sensor and the plastic hose which are connected in series are sleeved and wrapped on the outer protection pipe;
and a glue injection through hole is formed in the pipe wall of the outer protection pipe, and glue is injected into the outer protection pipe through the glue injection through hole so as to be used for fixing the single-mode optical fiber and the fiber bragg grating temperature sensor on the pipe wall of the outer protection pipe in an adhesive manner.
6. The method of claim 5, comprising the following steps in sequence:
1) the preparation method of the fiber grating temperature sensor comprises the following steps of:
a) firstly, utilizing hydrogen-carrying and ultraviolet photoetching writing to make optical fiber grating with target central wavelength on single-mode optical fiber;
b) the fiber bragg grating on the single-mode fiber is wrapped by the capillary quartz glass tube sleeve, then sealant is filled into the top tube opening and the bottom tube opening of the capillary quartz glass tube respectively, and then the sealant in the capillary quartz glass tube is solidified into a solid;
c) sheathing and wrapping the capillary quartz glass tube by using the inner protection tube, filling sealant into a top tube opening and a bottom tube opening of the inner protection tube respectively, and solidifying the sealant in the inner protection tube into a solid;
2) carrying out temperature calibration on each fiber bragg grating temperature sensor;
3) the fiber bragg grating temperature sensors after temperature calibration are welded to be connected in series to form an array;
4) and 3) packaging the serially connected fiber bragg grating temperature sensor prepared in the step 3) by using an outer protection tube.
7. The array forming method of the fiber grating temperature sensor array according to claim 6, wherein the grating region length of the fiber grating is 12mm, and the reflectivity is more than 95%;
the fiber grating temperature sensor array comprises 5-20 fiber grating temperature sensors, each fiber grating temperature sensor comprises a fiber grating, the difference of the central wavelengths of two adjacent fiber gratings is 2.4nm or integral multiple of 2.4nm, and the central wavelength of any fiber grating is within a band of 1533nm-1564 nm.
8. The method as claimed in claim 6, wherein the outer protection tube is a stainless steel tube;
the outer protection tube divide into the multistage, and the axial one end of every section outer protection tube is provided with the external screw thread, and the axial other end of every section outer protection tube is provided with the internal thread, and two sections adjacent outer protection tubes pass through external screw thread and internal screw thread cooperation constitution threaded connection.
9. The method of claim 6, wherein the capillary quartz glass tube has an outer diameter of 0.5mm, an inner diameter of 0.4mm and a length of 20 mm;
the outer diameter of the inner protection tube is 1.5mm, the inner diameter of the inner protection tube is 1mm, and the length of the inner protection tube is 30 mm;
the outer diameter of the outer protection tube is 5mm, the inner diameter of the outer protection tube is 3.5mm, and the length of each section of the outer protection tube is 0.5 m;
the plastic hose has an inner diameter of 0.4mm and an outer diameter of 0.9 mm.
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| CN202010468166.1A CN111562031B (en) | 2020-05-28 | 2020-05-28 | Fiber grating temperature sensor, array and array forming method thereof |
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| CN202010468166.1A CN111562031B (en) | 2020-05-28 | 2020-05-28 | Fiber grating temperature sensor, array and array forming method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112946813A (en) * | 2021-02-22 | 2021-06-11 | 西安石油大学 | Packaging structure of fiber grating |
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| JPH10141922A (en) * | 1996-11-12 | 1998-05-29 | Hitachi Cable Ltd | Multipoint strain and temperature sensor |
| CN2748888Y (en) * | 2004-12-10 | 2005-12-28 | 周智 | Fiber reinforced resin rib packaged fiber grating temperature sensor |
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| CN112946813A (en) * | 2021-02-22 | 2021-06-11 | 西安石油大学 | Packaging structure of fiber grating |
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| Publication number | Publication date |
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| CN111562031B (en) | 2022-08-26 |
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