WO2019010830A1 - 智能化塑料管道的光纤光栅传感器嵌件、植入系统及方法 - Google Patents
智能化塑料管道的光纤光栅传感器嵌件、植入系统及方法 Download PDFInfo
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- WO2019010830A1 WO2019010830A1 PCT/CN2017/103874 CN2017103874W WO2019010830A1 WO 2019010830 A1 WO2019010830 A1 WO 2019010830A1 CN 2017103874 W CN2017103874 W CN 2017103874W WO 2019010830 A1 WO2019010830 A1 WO 2019010830A1
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- G—PHYSICS
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- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
- G01L1/246—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre using integrated gratings, e.g. Bragg gratings
Definitions
- the invention relates to a fiber grating sensor insert, an implant system and a method for intelligent plastic pipes.
- the sensor is one of the key technical means to realize the intelligence of the equipment.
- Fiber Bragg Grating is a very sensitive sensing element for external environment such as temperature and temperature. Distributed multi-point measurement of single fiber can be realized by fiber grating string.
- the FBG sensor has the advantages of light weight, small size, high sensitivity, corrosion resistance and electromagnetic interference resistance. It is widely used in aerospace and large-scale civil engineering structures for health monitoring and intelligent control.
- the use of FBG sensors mainly includes surface mount and implant. If the FBG sensor is attached to the inner surface of the pipe, the erosion of the fluid in the pipe can easily cause the sensor to be debonded, displaced or even broken. If the FBG sensor is attached to the outer surface of the pipe, the outside of the pipe is bad. The construction or enabling environment is easy to deactivate the sensor, which seriously affects the test accuracy and service life of the sensor. Therefore, it is necessary to implant the FBG sensor in the pipeline to ensure its survival rate and test accuracy. However, it is quite difficult to implant fiber grating sensors in the process of industrial continuous extrusion of pipes. The implantation of fiber grating sensors in continuous extruded pipes is still the technical bottleneck of intelligent plastic pipes.
- the present invention provides a fiber grating sensor insert, an implant system and a method for intelligent plastic pipes, and the invention can ensure that the sensor survives in a poor pipeline manufacturing and service environment, and realizes the temperature and strain of the pipeline. Real-time online monitoring of parameters such as pressure.
- the first object of the present invention is to provide a fiber grating sensor insert for an intelligent plastic pipe.
- the insert has a long strip structure, and the reinforcing fiber and the matrix resin are used together to ensure that the fiber grating sensor insert is implanted in the plastic pipe. Melt and breakage do not occur, ensuring a solid foundation for the formation of intelligent plastic pipes.
- a second object of the present invention is to provide a fiber grating sensor implantation system for an intelligent plastic pipe.
- the system adopts oblique introduction in the process of continuous extrusion molding of a plastic pipe material to accurately form a long strip-shaped insert of the fiber grating sensor.
- the ground is implanted on the outer surface of the pipe to embed the temperature and strain sensors pre-planted in the elongated inserts in the pipe.
- a third object of the present invention is to provide a fiber grating sensor implantation method for an intelligent plastic pipe, and the method specifically comprises the preparation of a long strip-shaped insert of a fiber grating sensor, and the coextrusion of a long strip-shaped insert of a plastic and a fiber grating sensor.
- Important steps such as forming and welding the tube with the long strip-shaped insert of the fiber Bragg grating sensor, comprehensively and systematically guarantee the quality of the finished plastic pipe, contribute to the construction of urban pipelines, and build a “smart city”.
- a fiber-grating sensor strip-like insert of an intelligent plastic pipe comprising a base resin, a fiber grating temperature sensor, a fiber grating strain sensor and a reinforcing fiber, wherein the fiber grating temperature sensor and the fiber grating strain sensor are placed in parallel and juxtaposed
- Each has a plurality of grating units, and the grating unit positions correspond to each other to form a grating pair having both temperature and strain monitoring functions;
- the fiber grating temperature sensor and the fiber grating strain sensor are embedded in a matrix resin, and the matrix resin is longitudinally filled with reinforcing fibers.
- the reinforcing fibers are evenly and juxtaposed in the strip-like insert of the fiber grating sensor to support the skeleton of the entire strip-shaped insert of the fiber grating sensor.
- the fiber grating temperature sensor and the fiber grating strain sensor can engrave a plurality of gate regions for each fiber to form a distributed multi-point detection fiber grating string, and the spacing between the gate regions can be set according to requirements.
- the parallel spacing between the adjacent fiber grating temperature sensor and the fiber grating strain sensor is 0.25 to 2 mm.
- the gate region of the fiber grating temperature sensor is packaged with a capillary tube, and the capillary tubes are sealed at both ends.
- the fiber grating temperature sensor and the fiber grating strain sensor have a core diameter of 5 to 50 ⁇ m.
- the FBG sensor strip-shaped insert is a rectangular strip having a thickness of 0.4 to 1.2 mm and a width of 1 to 10 mm to facilitate the implantation operation.
- those skilled in the art can replace other shapes, such as a cylindrical shape, etc. on the basis of the working principle of the present invention, but the purpose is to make a pass.
- the sensor inserts are both flexible, easy to entangle, and easy to implant. Therefore, such improvements are conventional replacements that are readily apparent to those skilled in the art and are intended to be within the scope of the present invention.
- the base resin material of the FBG sensor strip insert is the same as the pipe material to be implanted, so as to improve the strength compatibility, interface compatibility and field distribution compatibility of the long strip insert of the FBG sensor and the tube. To minimize the influence of the long strip insert of the sensor on the performance of the product, while reducing the strain transmission loss of the sensor and improving the test accuracy.
- the reinforcing fiber of the FBG sensor strip insert has a melting point of at least 60 ° C higher than the melting point of the matrix resin to ensure that the reinforcing fiber does not melt when the sensor strip insert and the plastic tube are co-extruded.
- the fiber grating in the long strip insert of the sensor does not shift and bend during the entire implantation process.
- the volume of the reinforcing fibers in the elongated strip-shaped insert of the fiber Bragg grating sensor is 30-50%, so that the sensor strip-like insert has both rigidity and flexibility. If the content of the reinforcing fiber is too low, the FBG sensor insert is easily broken during pultrusion, and the molding of the insert is difficult to manufacture; on the contrary, the long strip-shaped insert of the FBG sensor is not easily bent due to too large rigidity. Therefore, it is difficult to attach the sensor strip-like insert to the cavity wall surface after being obliquely introduced into the extrusion cavity.
- the long strip-shaped insert of the fiber Bragg grating sensor needs to be marked with a color to facilitate positioning of the sensor, and the construction worker is reminded to protect the long strip-shaped insert of the protection sensor from being damaged. It should be noted that the sensor The color of the long strip insert cannot conflict with the color of the pipe common mark to facilitate differentiation.
- a fiber grating sensor insert inserting system comprising a barrel body, the barrel body is internally provided with a receiving cavity, the receiving cavity is sleeved with a rotating propulsion component, and the rotating propulsion component is connected to the transmission motor, the machine
- An extruder head is disposed on one side of the barrel body, the accommodating cavity is in communication with an extrusion cavity inside the extruder head, and an extrusion die is disposed at a front end of the extruder head;
- the extrusion cavity is in communication with an outwardly obliquely extending conveying passage provided on the extruder head, and a conveying member for conveying the elongated insert of the fiber grating sensor is disposed outside the conveying passage so as to be in the extrusion cavity
- the plastic raw materials are extruded together.
- the rotary propulsion unit is rotated at a high speed to stir and melt the plastic material in the accommodating cavity, and the long-gear insert of the FBG sensor is obliquely conveyed to the extruder through the conveying passage under the guiding action of the conveying member.
- the inside of the head is close to the surface of the extrusion cavity and passes through the extrusion die together with the molten plastic material, and is cooled and shaped to obtain an intelligent plastic pipe.
- the barrel body is provided with a raw material inlet, and the raw material inlet is in communication with the receiving cavity.
- the rotary propulsion member is a screw.
- the conveying member comprises a plurality of pairs of rollers, the rollers are arranged in pairs at the front end of the conveying passage, and are arranged in sequence, at least one pair of rollers are adjacent to the extruder head for adjusting and positioning the introduction direction of the sensor strip-shaped insert. And the angle, guiding the sensor strip insert to run forward to the transfer channel.
- the cross-sectional dimension of the transmission channel is set according to the cross-sectional dimension of the long strip-shaped insert of the fiber grating sensor, and the width thereof is larger than the width of the long strip-shaped insert of the sensor by 1 to 2 mm, and the height thereof is larger than the thickness of the long strip-shaped insert of the sensor. 0.5 to 1 mm, ensuring that the sensor strip insert can pass through the transfer channel without twisting.
- the angle between the conveying passage and the axis of the extruder head should be less than 60° to avoid the fiber grating
- the long strip-shaped insert of the sensor is broken due to excessive bending when it is attached to the wall surface of the cavity after being obliquely introduced into the extrusion cavity.
- the embedding point of the long strip-shaped insert of the fiber grating sensor is located on the surface of the extrusion cavity and passes through the extrusion die together with the molten plastic to form a plastic pipe of the long-shaped insert of the built-in fiber grating sensor.
- Such an arrangement ensures that the long strip-shaped insert of the fiber grating sensor is implanted on the outer surface of the plastic pipe, so that it can be peeled off from the pipe body during the subsequent welding operation, thereby respectively welding the plastic and the plastic, and welding the fiber and the optical fiber.
- the length of the plastic pipe of the inlaid fiber grating sensor strip-shaped insert can be cut as needed, but the cutting position should avoid the gate region of the fiber grating sensor and maintain a distance of at least 10 cm from the grid region.
- a method for preparing an intelligent plastic pipe includes the following steps:
- the method specifically includes:
- the fiber grating sensor insert is implanted in the connecting flange of the plastic pipe, and the fiber ends of the flange are connected at both ends of the flange, and the fiber in the transmission fiber joint at both ends of the flange is respectively connected with the plastic pipe.
- the embedded fiber is fused to complete fiber extension and optical signal relay. It should be noted that the number of transmission fibers implanted in the connecting flange is the same as the number of fiber grating sensors implanted in the plastic pipe, and the colors are in one-to-one correspondence to ensure that the same fiber grating sensor is welded to the front and rear of the flange.
- the strip-shaped insert of the sensor needs to be peeled off from the surface of the tube for a short length of 4 to 10 cm.
- the peeled out sensor insert is heated and melted to remove the encapsulating material of the outer layer of the optical fiber to expose the bare fiber to facilitate welding.
- the excess portion after the transmission fiber is welded is placed in the fiber joint hole of the connecting flange, and the fiber fusion portion is sealed after the plastic pipe is welded, thereby protecting the fiber grating transmission optical path from being damaged.
- the present invention provides a long strip-like insert of a fiber grating sensor implanted in a plastic pipe.
- the sensor insert has both rigidity and flexibility, and can be accurately and reliably embedded in continuous extrusion of a plastic pipe.
- the surface of the pipe avoids damage and damage of the sensor under severe working conditions, thereby significantly improving the survival rate and test accuracy of the sensor, and facilitating the fusion between the plastic pipes and the fusion of the fiber grating sensor and the transmission fiber;
- the present invention provides a fiber grating sensor implantation system for an intelligent plastic pipe, the system
- the system can conveniently embed the long-shaped inserts of the fiber grating sensor on the surface of the plastic pipe while producing the plastic pipe, and integrate the molding and facilitate the production of the pipeline;
- the invention provides a fiber grating sensor implantation method for an intelligent plastic pipe.
- the method is simple in operation, and combines the traditional plastic pipe continuous extrusion process technology with the fiber communication technology to manufacture an intelligent plastic pipe.
- Real-time online monitoring of parameters such as temperature, strain, pressure, etc., to achieve safety warning, fault diagnosis and automatic control of urban pipe network, thus effectively promoting the construction of “smart city”.
- FIG. 1(a) is a schematic structural view of a long strip-shaped insert of a fiber grating sensor according to the present invention
- Figure 1 (b) is a partial side view of Figure 1 (a) of the present invention.
- FIG. 2 is a schematic view showing a manufacturing process of a plastic pipe with a long strip-shaped insert of a built-in fiber grating sensor
- Figure 3 is an overall schematic view of the intelligent plastic pipe after welding.
- 1 is a fiber grating temperature sensor
- 2 is a fiber grating strain sensor
- 3 is a temperature grating unit
- 4 is a strain grating unit
- 5 is a capillary steel pipe
- 6 is a reinforcing fiber
- 7 is a matrix resin
- 8 is an extruder driving motor 9 is gear
- 10 is plastic material
- 11 is screw
- 12 is barrel
- 13 is extruder head
- 14 is extrusion cavity
- 15 is extrusion die
- 16 is fiber grating sensor strip insert
- 17 is a conveying roller
- 18 is a conveying passage
- 19 is an intelligent plastic pipe
- 20 is a connecting flange.
- orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is merely a relative relationship for the purpose of describing the structural relationship of the components or components of the present invention, and is not specifically referring to any component or component of the present invention, and may not be construed as a Limitations of the invention.
- the present application proposes a fiber grating sensor implantation system and method for an intelligent plastic pipe.
- the invention adopts an oblique introduction method to extend a fiber grating sensor strip in a process of continuous extrusion molding of a plastic pipe.
- the insert is accurately embedded in the outer surface of the pipe, thereby burying the temperature and strain sensor pre-planted in the long insert into the pipe, ensuring that the sensor survives in harsh pipe manufacturing and service environments, achieving the pipe Temperature, strain, pressure Real-time online monitoring of parameters.
- a method for implanting a fiber grating sensor of an intelligent plastic pipe comprising the steps of preparing a long strip-shaped insert of a fiber grating sensor, a step of co-extruding a tube of a strip of plastic and a fiber-optic grating sensor, and an optical fiber
- the tube welding step of the strip-shaped insert of the grating sensor comprising the steps of preparing a long strip-shaped insert of a fiber grating sensor, a step of co-extruding a tube of a strip of plastic and a fiber-optic grating sensor, and an optical fiber.
- the first step the preparation steps of the long strip-shaped insert of the fiber grating sensor.
- the prepared fiber grating sensor strip insert is a rectangular strip having a thickness of 0.4 to 1.2 mm and a width of 1 to 10 mm, and includes at least one temperature fiber grating sensor and a strain fiber grating sensor.
- the temperature FBG sensor measures the temperature
- the strained fiber grating sensor detects the strain
- all the FBG sensors in the same insert are marked with different colors to facilitate differentiation.
- each fiber can be engraved with multiple gate regions to form a distributed multi-point detection fiber grating string, and the spacing between the gate regions can be set according to needs.
- the parallel spacing between the adjacent fiber grating sensors is 0.25 to 2 mm.
- the gate region of the temperature fiber grating is packaged with a capillary tube having an outer diameter of 0.7 mm, and the ends are used DG-4 two-component adhesive is sealed.
- the fiber grating sensor has a core diameter of 5 to 50 ⁇ m.
- the base resin material of the long strip-shaped insert of the fiber grating sensor is the same as the pipeline material, so as to improve the strength compatibility, interface compatibility and field distribution compatibility of the long strip-shaped insert of the fiber grating sensor and the pipe, and maximize the compatibility.
- the ground reduces the influence of the long strip insert of the sensor on the performance of the product, and at the same time reduces the strain transmission loss of the sensor and improves the test accuracy.
- the reinforcing fiber of the FBG sensor strip insert has a melting point of at least 60 ° C higher than the melting point of the matrix resin to ensure that the reinforcing fiber does not melt when the sensor strip insert and the plastic tube are co-extruded.
- the fiber grating in the long strip insert of the sensor does not shift and bend during the entire implantation process.
- reinforcing fibers commonly used, and polyester fibers, nylon fibers, and spandex are preferred.
- the volume of the reinforcing fibers in the elongated strip-shaped insert of the fiber Bragg grating sensor is 30-50%, so that the sensor strip-like insert has both rigidity and flexibility. If the content of the reinforcing fiber is too low, the FBG sensor insert is easily broken during pultrusion, and the molding of the insert is difficult to manufacture; on the contrary, the long strip-shaped insert of the FBG sensor is not easily bent due to too large rigidity. Therefore, it is difficult to attach the sensor strip-like insert to the cavity wall surface after being obliquely introduced into the extrusion cavity.
- the FBG sensor strip inserts need to be marked with a specific color to facilitate positioning of the sensor and to alert the constructor to protect the sensor strip insert from damage. It should be noted that the color of the sensor strip insert cannot conflict with the color of the pipe common mark to facilitate differentiation.
- the second step is the co-extrusion of the plastic and FBG sensor strip inserts:
- the obtained FBG sensor strip insert is conveyed obliquely to the inside of the extruder head through the conveying passage after being unwound by the clamping, guiding and pushing action of the pair of rollers, close to the surface of the extrusion cavity and
- the molten plastic is passed through an extrusion die, and after cooling, the plastic pipe of the long-line insert of the built-in fiber grating sensor is obtained, and is cut and packaged as needed.
- the clamping, pushing and guiding device of the sensor strip-shaped insert is mainly composed of a plurality of pairs of rollers and a special conveying channel, and the first pair of rollers are at a position far from the extruder head, and the pushing sensor is elongated.
- the conveying passage is a long strip insert of the fiber grating sensor reaching the extrusion cavity The path of the surface to determine the initial embedded position of the sensor strip insert in the plastic melt.
- the embedding point of the long strip-shaped insert of the FBG sensor is located on the surface of the extrusion cavity and passes through the extrusion die together with the molten plastic to form an elongated insert of the embedded fiber grating sensor.
- Plastic pipe At this time, the long strip-shaped insert of the FBG sensor is implanted on the outer surface of the plastic pipe, so that it can be peeled off from the pipe body during the subsequent welding operation, thereby respectively splicing the plastic and the plastic, and welding the optical fiber and the optical fiber.
- the length of the plastic tube of the inlaid fiber grating sensor strip-shaped insert can be cut as needed, but the cutting position should avoid the gate area of the fiber grating sensor and maintain a distance of at least 10 cm from the grid area.
- the third step is a pipe welding step comprising a long strip-shaped insert of the fiber grating sensor:
- the prepared plastic pipe of the long-gear insert of the built-in fiber grating sensor is used to weld the plastic pipe and the fiber grating sensor therein through a connecting flange (with a fiber grating insert) to complete the pipe penetration and light. Relay of the signal.
- the fiber-grating sensor insert is embedded in the connecting flange of the plastic pipe, and the fiber-optic connector is taken out at both ends of the flange, and the fiber in the transmission fiber connector at both ends of the flange is respectively welded with the fiber embedded in the plastic pipe to complete the fiber.
- Extended, optical signal relay It should be noted that the transmission fiber implanted in the connection flange The number is the same as the number of FBG sensors embedded in the plastic pipe, and the colors are in one-to-one correspondence to ensure that the same FBG sensor is welded to the front and rear of the flange.
- the strip-shaped insert of the sensor needs to be peeled off from the surface of the tube for a short length of 4 to 10 cm.
- the peeled out sensor insert is heated and melted to remove the encapsulating material of the outer layer of the optical fiber to expose the bare fiber to facilitate welding.
- the excess portion after the transmission fiber is welded is placed in the fiber joint hole of the connecting flange, and the fiber fusion portion is sealed after the plastic pipe is welded, thereby protecting the fiber grating transmission optical path from being damaged.
- the utility model relates to a long-shaped insert of a fiber grating sensor for online monitoring of an intelligent plastic pipe, and the structure thereof is as shown in FIG. 1(a) and FIG. 1(b), comprising: a fiber grating temperature sensor 1, a fiber grating strain sensor 2, and an enhancement.
- the fiber 6 (the reinforcing fiber is selected from the polyester fiber in the embodiment) and the matrix resin 7 (the base resin in the embodiment is a random copolymer polypropylene).
- the manufacturing process of the plastic tube of the long-line insert of the built-in fiber grating sensor is shown in Fig. 2, wherein the extruder drive motor 8 provides power, and the gear 9 drives the screw 11 to rotate and mix the plastic material 10 at a high speed (the plastic in this embodiment)
- the raw material is randomly fused with polypropylene to melt it, and the FBG sensor strip insert 16 is conveyed obliquely to the extruder head 13 via the conveying passage 18 under the action of the conveying, conveying and guiding of the conveying roller 17. Internally, it is placed close to the surface of the extrusion cavity 14 and passes through the extrusion die 15 together with the molten random copolymer polypropylene 10, and is cooled and shaped to obtain an intelligent plastic pipe 19.
- FIG. 3 is an overall schematic view of the intelligent plastic pipe after welding, and the intelligent plastic pipe 19 and the fiber grating sensor therein are respectively welded and protected by the connecting flange 20, and the pipe penetration and the optical signal are completed. Number relay.
- a fiber grating sensor implantation method for an intelligent plastic pipe includes the following steps:
- thermoplastic protective layer with a certain thickness and different colors on the outer periphery of the optical fiber by hot extrusion, coating, winding and other forming processes.
- step b) selecting one of the optical fibers completed in step b), encapsulating all the gate regions engraved on the capillary tube 5, and ensuring that the gate region is free in the tube, and the outer diameter of the capillary tube 5 for packaging is 0.7.
- Mm wall thickness 0.2mm, sealed at both ends with DG-4 two-component glue, placed at room temperature for 24 hours to fully cure, forming fiber grating temperature sensor 1; another fiber optic grid area without capillary tube 5, as fiber Grating strain sensor 2.
- the FBG sensor strip insert 16 reaches the winder at a uniform speed under the drag of the tractor to perform winding and packaging processing.
- the particulate random copolymer polypropylene 10 is added to the barrel 12 of the extruder, and there is a heater outside the extruder barrel 12, and the heat generated by the heater is transferred to the barrel 12 by heat conduction.
- the polypropylene 10 is copolymerized to gradually increase the temperature.
- the random copolymer polypropylene 10 With the rotation of the screw 11, the random copolymer polypropylene 10 is continuously conveyed forward, and collides with the screw 11 and the barrel 12 during the conveying process to generate a large amount of heat, which cooperates with the heat conduction to make the joining
- the random copolymer polypropylene 10 is continuously melted, and the molten random copolymer polypropylene 10 is continuously and stably delivered to the extruder head 13.
- the intelligent plastic pipe 19 is continuously advanced, and after being cut into the cutting device, it is cut and packaged for storage and transportation.
- the FBG sensor strip insert 16 is stripped from the surface of the intelligent plastic tube 19 by a small length of 5 cm, and the stripped sensor insert is heated and melted to remove the outer layer of the fiber.
- the encapsulating material exposes the bare fiber.
- the optical fiber fusion splicer is used to fuse the optical fiber in the corresponding transmission fiber connector with the fiber embedded in the plastic pipe, and then the excess portion after the transmission fiber is fused is placed in the fiber connector hole of the connection flange 20, and the fiber is sealed. Welding site.
- the transmission fiber is taken out from the pipeline, welded to the external transmission cable, and the cable joint is connected to the fiber grating demodulation system to realize on-line monitoring of the temperature and strain of the plastic pipe.
- the reinforcing fiber in the long strip-shaped insert of the fiber grating sensor is made of nylon fiber
- the base resin and the pipe material in the sensor strip-shaped insert are made of polyvinyl chloride.
- the reinforcing fiber in the long strip-shaped insert of the fiber grating sensor is made of spandex, and the base resin and the pipe material in the sensor strip-shaped insert are made of polyethylene.
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- 一种智能化塑料管道的光纤光栅传感器长条状嵌件,其特征是:包括基体树脂、光纤光栅温度传感器、光纤光栅应变传感器和增强纤维,所述光纤光栅温度传感器、光纤光栅应变传感器平行并列放置,两者均具有多个光栅单元,且光栅单元位置相对应,共同组成一个兼具温度和应变监测功能的光栅对;所述光纤光栅温度传感器、光纤光栅应变传感器埋设于基体树脂内,同时基体树脂内填充有增强纤维,所述增强纤维在光纤光栅传感器长条状嵌件内均匀并列分布,用以支撑起整个光纤光栅传感器长条状嵌件的骨架。
- 如权利要求1所述的一种智能化塑料管道的光纤光栅传感器长条状嵌件,其特征是:所述光纤光栅温度传感器、光纤光栅应变传感器每根光纤可刻制多个栅区,形成分布式多点检测的光纤光栅串,栅区之间的间距可根据需要自行设定。
- 如权利要求1或2所述的一种智能化塑料管道的光纤光栅传感器长条状嵌件,其特征是:所述光纤光栅温度传感器的光纤光栅的栅区用毛细钢管封装,毛细钢管两端进行密封。
- 如权利要求1所述的一种智能化塑料管道的光纤光栅传感器长条状嵌件,其特征是:光纤光栅传感器长条状嵌件的基体树脂材料与待植入的管道材料相同。
- 如权利要求1所述的一种智能化塑料管道的光纤光栅传感器长条状嵌件,其特征是:所述光纤光栅传感器长条状嵌件中增强纤维的熔点至少高出基体树脂熔点60℃。
- 如权利要求1所述的一种智能化塑料管道的光纤光栅传感器长条状嵌件, 其特征是:所述光纤光栅传感器长条状嵌件中增强纤维的体积含量为30~50%。
- 一种光纤光栅传感器长条状嵌件植入系统,其特征是:包括机筒本体,所述机筒本体内部设置有容纳腔体,所述容纳腔体内套设有旋转推进部件,旋转推进部件连接传动电机,所述机筒本体一侧设置有挤出机头,所述容纳腔体与挤出机头内部的挤出模腔连通,挤出机头的前端设置有挤出口模;所述挤出模腔与挤出机头上设置的向外斜向延伸的传送通道连通,传送通道外侧设置有输送光纤光栅传感器长条状嵌件的传送件,使得其与挤出模腔内的塑料原料一起挤出成型。
- 如权利要求7所述的一种光纤光栅传感器长条状嵌件植入系统,其特征是:所述机筒本体上设置有原料入口,原料入口与容纳腔体连通。
- 如权利要求7所述的一种光纤光栅传感器长条状嵌件植入系统,其特征是:所述传送件包括多对辊子,所述辊子成对设置于传送通道前端,依次布设,至少有一对辊子靠近挤出机头,用以调整、定位传感器长条状嵌件的导入方向和角度,引导传感器嵌件向前运行至传送通道。
- 如权利要求7所述的一种光纤光栅传感器长条状嵌件植入系统,其特征是:光纤光栅传感器长条状嵌件的嵌入点位于挤出模腔表面并与熔融的塑料一同经过挤出口模,形成内植光纤光栅传感器长条状嵌件的塑料管材。
- 一种智能化塑料管道的制备方法,其特征是:包括以下步骤:(1)制备光纤光栅传感器长条状嵌件;(2)将得到的光纤光栅传感器长条状嵌件由传送通道被斜向传送至挤出机头内部,贴近挤出模腔表面并与熔融的塑料一起通过挤出口模,经冷却定型 后即得到内植光纤光栅传感器的塑料管材,并根据需要进行切割和包装;(3)通过内植有光纤光栅嵌件连接法兰将塑料管材以及其中的光纤光栅传感器分别熔接,完成管道的贯通以及光信号的中继。
- 如权利要求11所述的一种智能化塑料管道的制备方法,其特征是:所述步骤(1)中,具体包括:a)将增强纤维、刻栅完成后的光纤固定于纱架,并使其穿过导纱板,其中,光纤位于中间位置,增强纤维纱束均布于光纤四周;b)将穿过导纱板的光纤和增强纤维进行烘干、浸润液态高温树脂处理;c)浸润液态高温树脂后的光纤和增强纤维以拉挤工艺的形式穿过成型模具,在成型的同时挤去多余的树脂,并排除材料中的气泡,得到一定截面形状的光纤光栅传感器嵌件;d)将得到的光纤光栅传感器嵌件在牵引机的拖曳作用下匀速到达收卷机,进行收卷和包装处理。
- 如权利要求11所述的一种智能化塑料管道的制备方法,其特征是:所述步骤(3)中,塑料管材的连接法兰内植了光纤光栅传感器嵌件,法兰的两端有引出的光纤接头,将法兰两端的传输光纤接头中的光纤分别与塑料管材中内植的光纤熔接,完成光纤延长、光信号中继。
- 如权利要求11所述的一种智能化塑料管道的制备方法,其特征是:在光纤光栅熔接之前需要将传感器长条状嵌件从管材表面剥离出一小段,将剥离出的传感器嵌件加热熔融以去除光纤外层的封装材料,露出裸纤,以便于熔接,然后将传输光纤熔接后的多余部分置于连接法兰的光纤接头孔内,在塑料管材 熔接完成后胶封光纤熔接部位,以保护光纤光栅传输光路不受破坏。
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