CN113884228B - Metallized fiber bragg grating stress sensor suitable for cold-rolled sheet shape detection - Google Patents
Metallized fiber bragg grating stress sensor suitable for cold-rolled sheet shape detection Download PDFInfo
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- CN113884228B CN113884228B CN202111150497.1A CN202111150497A CN113884228B CN 113884228 B CN113884228 B CN 113884228B CN 202111150497 A CN202111150497 A CN 202111150497A CN 113884228 B CN113884228 B CN 113884228B
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- cylindrical base
- metal disc
- elastic metal
- metallized fiber
- fiber bragg
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- 239000000835 fiber Substances 0.000 title claims abstract description 63
- 238000001514 detection method Methods 0.000 title claims abstract description 16
- 239000002184 metal Substances 0.000 claims abstract description 58
- 229910052751 metal Inorganic materials 0.000 claims abstract description 58
- 238000005097 cold rolling Methods 0.000 claims abstract description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 16
- 229910052759 nickel Inorganic materials 0.000 claims description 8
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 238000001465 metallisation Methods 0.000 claims description 4
- 239000013307 optical fiber Substances 0.000 abstract description 7
- 238000012545 processing Methods 0.000 abstract description 7
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 230000003287 optical effect Effects 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 description 9
- 238000006073 displacement reaction Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000011796 hollow space material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Classifications
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optical Transform (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses a metallized fiber grating stress sensor suitable for cold-rolled plate shape detection, which relates to the technical field of optical fibers and optical devices and the field of metal cold-rolling processing equipment, and comprises a cylindrical base with an upward opening, an elastic metal disc arranged at the opening of the cylindrical base and fixedly connected with the opening of the cylindrical base, a pressure contact cap fixedly connected with the upper surface of the elastic metal disc and with a downward opening, and a metallized fiber grating fixedly connected in a space surrounded by the cylindrical base, the elastic metal disc and the pressure contact cap, wherein the metallized fiber grating extends upwards from the inside of the cylindrical base to penetrate through the thickness of the elastic metal disc, enters the inside of the pressure contact cap and then extends downwards to penetrate through the thickness of the elastic metal disc again to return to the inside of the cylindrical base. The invention has simple processing technology, low cost and stable operation, reduces the phenomenon of sensor sensitivity reduction caused by stress transmission loss, and expands the application range of equipment.
Description
Technical Field
The invention relates to the technical field of optical fibers and optical devices and the field of metal cold rolling processing equipment, in particular to a metallized fiber bragg grating stress sensor suitable for cold rolling plate shape detection, and belongs to a fiber bragg grating stress sensor.
Background
The metal cold-rolled sheet band plate shape detection equipment is used as basic equipment necessary in the field of metal rolling processing, and has important significance for guaranteeing the rolling quality of the sheet and improving the processing production efficiency of the sheet band. The stress sensor widely used in the existing plate shape detector is typically represented by an electronic or mechanical sensor, and has various problems in measurement precision, measurement speed, process structure, interference resistance and the like.
The fiber bragg grating sensing technology is an important branch in the field of fiber bragg grating sensing, and is very suitable for the field of detection of parameters such as temperature, stress and strain in a strong electromagnetic interference environment due to the characteristics of simple structure, high detection precision, high response speed, oil stain resistance, electromagnetic interference resistance and the like. Along with the continuous exploration of fiber bragg grating sensor theory, various sensors such as stress sensor, strain sensor, temperature sensor, acceleration sensor and the like manufactured by fiber bragg grating are widely applied to engineering fields such as aerospace, biomedicine, ocean engineering, structural health monitoring and the like in recent years.
The stress sensitive elements in various fiber bragg grating sensors mainly comprise elastic cylinders, hollow elastic cylinders, cantilever beams, torsion bars, circular diaphragms and the like. In the traditional preparation method of the stress sensor, the fiber bragg grating is stuck on the surface of the elastic metal cylinder, the fiber bragg grating can be finally detected by demodulation equipment only through large-area stress transmission, the born load is large, the generated displacement is small, the stress sensitivity of the prepared sensor is not high enough, and the application range is greatly limited. Other methods, such as the preparation method using cantilever structures, use strain or displacement of the free end as output, have simple structures and high sensitivity, but are often used for detecting smaller forces and strains.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the metallized fiber bragg grating stress sensor suitable for cold-rolled sheet shape detection, which has simple processing technology, low cost and stable work, and is suitable for other industrial occasions requiring accurate measurement of compressive stress.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a metallization fiber bragg grating stress sensor suitable for cold rolling sheet shape detects, includes the cylindrical base of opening ascending cylinder, sets up at the cylindrical base opening part with the opening fixed connection's of cylindrical base elastic metal disc, the downward pressure contact cap of opening fixed connection on elastic metal disc upper surface, the metallization fiber bragg grating of fixed connection in the space that cylindrical base, elastic metal disc and pressure contact cap enclose, the metallization fiber bragg grating extends from the cylindrical base upwards and pierces through the thickness of elastic metal disc and gets into the inside of pressure contact cap after the downward extension again pierces through the thickness of elastic metal disc and get back into in the cylindrical base.
The technical scheme of the invention is further improved as follows: the two ends of the metallized fiber bragg grating are fixedly connected with flange joints, the flange joints are fixedly connected to the outer wall surface of the cylindrical base, and the two flange joints are respectively positioned on the front side and the rear side of the outer wall surface of the cylindrical base.
The technical scheme of the invention is further improved as follows: the flange joint is fixedly connected to the middle part of the outer wall surface of the cylindrical base in the height direction.
The technical scheme of the invention is further improved as follows: the outer surface of the metallized fiber grating is provided with a grating metal coating area.
The technical scheme of the invention is further improved as follows: the bottom surface of the internal cavity of the cylindrical base is fixedly connected with a cylindrical base bottom small cylinder, the cylindrical base bottom small cylinder is provided with a small cylinder center through hole and a small cylinder center-to-edge groove, and the metallized fiber bragg grating is inserted into the small cylinder center through hole and the small cylinder center-to-edge groove.
The technical scheme of the invention is further improved as follows: and through holes which are matched with the metallized fiber bragg gratings and penetrate through the thickness of the elastic metal disc are formed in the elastic metal disc.
The technical scheme of the invention is further improved as follows: and nickel pipes at two ends of the two gratings are arranged on the metallized fiber gratings.
The technical scheme of the invention is further improved as follows: and nickel pipes at two ends of the two gratings on the metallized fiber bragg grating are welded with the small cylinder at the bottom of the cylindrical base.
By adopting the technical scheme, the invention has the following technical progress:
the invention has simple processing technology, low cost and stable work, is suitable for the metallized fiber bragg grating stress sensor for cold-rolled plate shape detection, can be suitable for other industrial occasions needing to precisely measure compressive stress, combines the respective advantages of an elastic cylindrical method and a cantilever beam method, can measure the characteristic of large load by utilizing the elastic metal disc, and simultaneously directly influences the change of the central wavelength of the grating through the displacement of the free end, namely the elastic metal disc, thereby reducing the defect of reduced sensitivity of the sensor caused by stress transmission loss as much as possible. The sensor is flexibly designed, expands the application range of equipment and is convenient to be applied to the field of measurement and detection of more industries.
The stress measurement value of the sensor is only related to the axial stress of the sensor and is irrelevant to the stress direction around the sensor, so that the stress level at the stress point can be more effectively reflected.
The fiber bragg grating is reserved in the sensor, the flange joint is used as an external interface, and the sensor only has an external structure of the interface, so that the sensor can work normally in a rotating or other complex working environments and is not easy to damage. The grating is prevented from being sealed on the surface, the optical fiber passes through the lower base and is left in the plate-type detection roller, the structure that the optical fiber is easy to break is turned, and the service life of the device is prolonged.
The sensor can be connected in series to form a cascading fiber bragg grating sensor network, and quasi-distributed stress measurement is carried out; by adjusting the positions of the sensors, temperature compensation can be performed on measurement contents, for example, four sensors are fixed on one surface of a cold-rolled sheet type detector to measure stress variation, and one sensor is fixed on the opposite surface of the cold-rolled sheet type detector to measure only temperature variation without stress, so that wavelength drift of the sensors caused by temperature variation is eliminated according to the wavelength value of the temperature compensation fiber bragg grating, and measurement accuracy is improved.
The sensor has good electromagnetic interference resistance, and the optical signals transmitted in the optical fiber are not affected by electromagnetic interference; the fiber bragg grating is a passive device, does not need power supply driving, is convenient to prepare and install, and is easy to demodulate.
Drawings
FIG. 1 is a schematic diagram of a sensor structure in front cut-away;
FIG. 2 is a schematic side sectional view of FIG. 1;
FIG. 3 is a schematic top view of a spring metal disk of the sensor;
FIG. 4 is a schematic diagram of a metallized fiber grating structure;
FIG. 5 is a schematic top view of a sensor cylindrical base;
wherein, 1, a pressure contact cap, 2, a metallized fiber grating, 21, a grating metal coating area, 22, nickel pipes at two ends of the grating, 3, a flange joint, 4, an elastic metal disc, 41, a through hole of the elastic metal disc, 42 and a surface annular groove, and 5, a cylindrical base, 51, an outer wall of the cylindrical base, 52, an inner wall of the cylindrical base, 53, a small cylinder at the bottom of the cylindrical base, 54, a through hole in the center of the small cylinder, 55 and a groove from the center to the edge of the small cylinder.
Detailed Description
The invention is further illustrated by the following examples:
as shown in fig. 1 to 5, a metallized fiber grating stress sensor suitable for cold-rolled sheet shape detection is of a hollow structure, and mainly comprises a cylindrical base 5, an elastic metal disc 4, a pressure contact cap 1, a metallized fiber grating 2 and a flange joint 3. As shown in fig. 1 or fig. 3 or fig. 5, the step formed by the cylindrical base outer wall 51 and the cylindrical base inner wall 52 of the cylindrical base 5 can closely receive and fix the elastic metal disc 4; the annular groove 42 on the upper surface of the elastic metal disc 4 can be tightly embedded with the pressure contact cap 1; the through hole 41 on the elastic metal disc 4 and the through hole 54 at the center of the small cylinder at the bottom of the cylindrical base 5 and the groove 55 from the center to the edge of the small cylinder from the center to the edge can pass through and fix the metallized fiber grating 2.
The elastic metal disc 4 is a flat cylinder, the upper surface of the elastic metal disc is provided with a circular groove 42, the circular groove 42 can be tightly embedded with the pressure contact cap 1, on one hand, the metallized fiber bragg grating 2 is protected from being damaged and broken, on the other hand, stress information can be transmitted to the elastic metal disc 4 through the pressure contact cap 1, so that the elastic metal disc is slightly deformed, and further the displacement variation of the free end of the metallized fiber bragg grating 2 is influenced;
the center of the elastic metal disc 4 and the position close to the edge of the annular groove 42 are provided with two through holes 41 of the elastic metal disc for penetrating into and out of the metallized fiber bragg grating 2; the bottom of the cylindrical base 5 is provided with a small bulge cylinder, namely a small cylinder 53 at the bottom of the cylindrical base, a through hole 54 at the center of the small cylinder 53 at the bottom of the cylindrical base and a groove 55 from the center to the edge of the small cylinder at the center to the edge are used for fixing and routing the metallized fiber bragg grating 2;
the metallized fiber grating 2 is provided with two nickel pipes which can be welded at the corresponding positions of the centers of the cylindrical base 5 and the elastic metal disc 4 to fix the metallized fiber grating 2 and apply certain prestress; the outer surface of the metallized fiber grating 2 is provided with a grating metal coating area 21;
the two ends of the metallized fiber bragg grating 2 are connected with flange joints 3 to serve as external interfaces; the flange joint 3 is fixedly connected to the middle part of the outer wall surface of the cylindrical base 5 in the height direction;
the excess fiber is glued along the inner wall of the cylindrical base inner wall 52 or hidden in the hollow space between the resilient metal disc 4 and the pressure contact cap 1.
The specific manufacturing method comprises the following steps: first, two flange joints 3 are embedded and welded on the corresponding front and rear surfaces of the outer wall of the cylindrical base 5, that is, on the cylindrical base outer wall 51; then, one end of the metallized fiber grating 2 shown in fig. 4 is cut short and connected to the flange joint 3, the metallized fiber grating 2 is fixed downwards along the inner wall of the cylindrical base 5, namely extends downwards along the inner wall 52 of the cylindrical base, is buried in the groove 55 from the center to the edge of the small cylinder on the small cylinder 53 at the bottom of the cylindrical base 5, the length is reserved for embedding the nickel pipes 22 at the two ends of the end of the metallized fiber grating 2 into the through holes 54 at the center of the small cylinder on the small cylinder 53 at the bottom of the cylindrical base 5, and the end is fixed by laser welding; the other end of the metallized fiber grating 2 passes through the through holes 41 of the two elastic metal discs of the elastic metal disc 4 shown in fig. 3, returns to the inside of the cylindrical base 5 and is connected to the other flange joint 3, and the metallized fiber grating 2 is fixed upwards along the inner wall 52 of the cylindrical base 5 until being fixed beside the through holes 41 of the elastic metal disc 4; at the moment, the elastic metal disc 4 is covered at the opening of the cylindrical base 5, and the two parts are fixed by laser welding; then, a clamp is used for vertically fixing the section of optical fiber of which the through hole 41 of the elastic metal disc at the center of the elastic metal disc 4 is leaked outside, a rotary vernier applies certain prestress and a nickel tube 22 at the free end of the metallized fiber bragg grating 2 is welded and fixed on the through hole 41 of the elastic metal disc 4, so that a sensor main body structure with hollow inside and suspended fiber bragg grating and directly influencing the change of grating center wavelength through the displacement of the elastic metal disc 4 at the free end is formed; finally, the section of optical fiber which leaks outside is covered by the pressure contact cap 1 and welded and fixed on the main structure of the sensor between the through holes 41 of the two elastic metal discs 4, thus completing the preparation of the whole sensor.
The performance of the finished sensor is directly related to the material and thickness chosen for the resilient metal disc 4. There is a linear relationship between the small displacement of the resilient metal disc 4 and the external compressive stress. The thickness of the resilient metal disc 4 influences the gradient of the above-mentioned linear relationship; the larger the thickness is, the smaller the linear gradient is, and the smaller the variation of the center wavelength of the fiber grating caused by the displacement variation is. According to the above properties, the flexible metal disc 4 with different materials and thicknesses can be well selected according to engineering requirements to design the measuring range of the sensor. Based on the above, the sensor can be flexibly designed, so that the sensor can be applied to the field of more industrial measurement and detection.
Claims (4)
1. The utility model provides a metallization fiber bragg grating stress sensor suitable for cold rolling plate shape detects which characterized in that: the device comprises a cylindrical base (5) with an upward opening, an elastic metal disc (4) which is arranged at the opening of the cylindrical base (5) and fixedly connected with the opening of the cylindrical base (5), a pressure contact cap (1) which is fixedly connected with the upper surface of the elastic metal disc (4) and has a downward opening, and a metallized fiber grating (2) which is fixedly connected in a space surrounded by the cylindrical base (5), the elastic metal disc (4) and the pressure contact cap (1), wherein the metallized fiber grating (2) extends upwards from the inside of the cylindrical base (5) to penetrate through the thickness of the elastic metal disc (4) to enter the inside of the pressure contact cap (1) and then extends downwards to penetrate through the thickness of the elastic metal disc (4) to return to the inside of the cylindrical base (5); the two ends of the metallized fiber bragg grating (2) are fixedly connected with flange joints (3), the flange joints (3) are fixedly connected to the outer wall surface of the cylindrical base (5), and the two flange joints (3) are respectively positioned on the front side and the rear side of the outer wall surface of the cylindrical base (5) oppositely; the flange joint (3) is fixedly connected to the middle part of the outer wall surface of the cylindrical base (5) in the height direction; the bottom surface of the internal cavity of the cylindrical base (5) is fixedly connected with a cylindrical base bottom small cylinder (53), a small cylinder center through hole (54) and a small cylinder center-to-edge groove (55) are formed in the cylindrical base bottom small cylinder (53), and the metallized fiber bragg grating (2) is inserted into the small cylinder center through hole (54) and the small cylinder center-to-edge groove (55); the elastic metal disc (4) is provided with through holes (41) which are matched with the metallized fiber bragg grating (2) and penetrate through the thickness of the elastic metal disc (4).
2. The metallized fiber bragg grating stress sensor suitable for cold-rolled sheet shape detection of claim 1, wherein: the outer surface of the metallized fiber grating (2) is provided with a grating metal coating area (21).
3. The metallized fiber bragg grating stress sensor suitable for cold-rolled sheet shape detection of claim 1, wherein: the metallized fiber bragg grating (2) is provided with nickel pipes (22) at two ends of the two gratings.
4. A metallized fiber bragg grating stress sensor suitable for cold rolled sheet shape detection according to claim 1 or 3, wherein: nickel pipes (22) at two ends of two gratings on the metallized fiber bragg grating (2) are welded with a small cylinder (53) at the bottom of the cylindrical base.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111150497.1A CN113884228B (en) | 2021-09-29 | 2021-09-29 | Metallized fiber bragg grating stress sensor suitable for cold-rolled sheet shape detection |
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| CN202111150497.1A CN113884228B (en) | 2021-09-29 | 2021-09-29 | Metallized fiber bragg grating stress sensor suitable for cold-rolled sheet shape detection |
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| CN113884228B true CN113884228B (en) | 2024-03-26 |
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