CN112014011A - Internal stress measuring device and preparation method thereof - Google Patents
Internal stress measuring device and preparation method thereof Download PDFInfo
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- CN112014011A CN112014011A CN202010700422.5A CN202010700422A CN112014011A CN 112014011 A CN112014011 A CN 112014011A CN 202010700422 A CN202010700422 A CN 202010700422A CN 112014011 A CN112014011 A CN 112014011A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 6
- 239000000835 fiber Substances 0.000 claims abstract description 89
- 238000007639 printing Methods 0.000 claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 claims abstract description 13
- 238000012545 processing Methods 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 230000008054 signal transmission Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 4
- 238000010146 3D printing Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 6
- 230000008021 deposition Effects 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 2
- 239000002689 soil Substances 0.000 description 9
- 239000012528 membrane Substances 0.000 description 8
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000010923 batch production Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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- 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
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- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention discloses an internal stress measuring device and a preparation method thereof. The main body and the bottom cover are processed and finished through a 3D fused deposition printing technology, and the main body and the bottom cover are designed integrally, so that the defects of the traditional processing technology of the existing sensor are overcome. The internal stress measuring device is set to be of a double-layer integrated structure, the first fiber grating sensor and the second fiber grating sensor are embedded into the device, the first fiber grating sensor is in full contact with the first diaphragm, the second fiber grating sensor is in full contact with the hollow cylinder, and the first fiber grating sensor and the second fiber grating sensor are deformed in a coordinated mode. The preparation method shortens processing period and reduces manufacturing cost.
Description
Technical Field
The invention relates to the technical field of fiber bragg grating pressure sensors, in particular to an internal stress measuring device and a manufacturing method thereof.
Background
A Fiber Bragg Grating (FBG) is an optical sensor that is inscribed in the center of a standard single mode fiber in a spatially varying manner using intense ultraviolet laser, and is applied to various fields such as civil engineering, aerospace, petrochemical, electric power, medical, marine industries, etc. due to its unique advantages.
The existing sensor generally adopts the traditional forming technology, and the traditional forming technology has certain defects in the aspect of sensor development: the model processing cycle is long, the small batch production is expensive, and the sensor is generally assembled and can only measure the soil pressure. The bare fiber grating cannot directly reach the standard of practical application in civil engineering due to the characteristics of fragility, thinness, easy breaking, poor shearing resistance and the like.
Disclosure of Invention
The present invention is directed to solve at least one of the problems of the prior art, and provides an internal stress measurement device and a method for manufacturing the same, which reduces the production period and cost of small-lot or single-lot sensors, so that the sensors can be practically applied to the effectiveness of fiber gratings.
The technical scheme adopted by the invention is as follows: an internal stress measuring device, comprising:
the main body comprises a first diaphragm, a first fiber grating sensor, a side wall and a second diaphragm, wherein the side wall is arranged on the outer ring of the first diaphragm in a surrounding manner, the first diaphragm is arranged at one side port of the side wall, the second diaphragm is arranged in a space formed by the surrounding of the side wall, a first cavity is formed by the first diaphragm, the side wall and the second diaphragm in a surrounding manner, the first cavity is a closed cavity, and the first fiber grating sensor is fixedly connected to the first diaphragm; and
the bottom cover comprises a bottom cover diaphragm, a hollow cylinder and a second fiber grating sensor, the hollow cylinder is arranged on the top surface of the bottom cover diaphragm, the second fiber grating sensor is fixedly connected to the side surface of the hollow cylinder, the hollow cylinder is provided with a top cover, the hollow cylinder and the bottom cover enclose a second cavity, the second cavity is an airtight cavity, a third cavity is formed between the bottom cover and the main body in a combined mode, the third cavity is located on the outer side of the hollow cylinder, and the side wall is provided with a water flowing through hole only leading to the third cavity.
Has the advantages that: the internal stress measuring device is an integrated device, and the first fiber grating sensor and the second fiber grating sensor are fixed in the device, so that the fiber grating sensor is fully contacted with the diaphragm and cooperatively deformed, and the problem that the bare fiber grating cannot be directly applied to practical application in civil engineering due to the characteristics of fragility, thinness, easiness in breaking, poor shearing resistance and the like of the bare fiber grating is solved. The structural design of the internal stress measuring device enables the device to measure the overburden pressure of the soil body and the water pressure of the lower portion of the soil body, and the purpose of two purposes of one device is achieved.
Furthermore, the first diaphragm is provided with a first groove for placing the first fiber grating sensor, the inner side surface of the hollow cylinder is provided with a second groove, and the second fiber grating sensor is fixedly connected in the second groove.
Furthermore, an output port is formed in the side wall, and the signal transmission tail fiber part of the second fiber bragg grating sensor penetrates out through the output port.
Further, a protection handle is arranged on the outer side of the side wall, and the protection handle is arranged at the penetrating position of the first fiber grating sensor.
Further, the hollow cylinder is arranged in a semi-cylindrical shape, the diameter of the hollow cylinder is smaller than that of the bottom cover membrane, and the central axis of the hollow cylinder is coincident with that of the bottom cover membrane.
Furthermore, a plurality of water flow through holes are formed in the side wall of the third cavity and face the straight line section of the hollow cylinder.
A method for manufacturing an internal stress measuring device comprises the following steps:
(1) the preparation method comprises the steps that a 3D printing device is used for preparing, a first diaphragm coated with pressure is processed firstly, the first diaphragm with a certain thickness is printed, a first groove is formed in the first diaphragm, the first groove is used for laying a first fiber grating sensor, and printing is suspended when the printing of the side wall is started;
(2) placing the first fiber grating sensor in the first groove, determining the position, and fixing the first fiber grating sensor;
(3) continuously printing the side wall, printing a second diaphragm after the side wall is printed, wherein the first diaphragm, the side wall and the second diaphragm enclose a first cavity, the side wall is continuously printed upwards after the second diaphragm is printed, and the side wall is provided with an output hole and a certain number of water flowing through holes with certain size;
(4) processing a bottom cover, printing a bottom cover diaphragm, printing a semicircular hollow cylinder with the radius smaller than that of the bottom cover diaphragm on the bottom cover diaphragm, namely printing the semicircular hollow cylinder with the shape of a D shape, printing an upper cover on the hollow cylinder, forming a closed cavity in the hollow cylinder, and arranging a second groove on a straight line section on the inner side of the hollow cylinder for placing a second fiber bragg grating sensor;
(5) and placing the second fiber grating sensor in the second groove, determining the position, and fixing the second fiber grating sensor.
Has the advantages that: the manufacturing method of the internal stress measuring device shortens the processing period, greatly reduces the material waste, simplifies the manufacturing process, reduces the manufacturing cost, can design the required model at will, realizes the aim of two purposes of one sensor, and solves the problem that the bare fiber grating is difficult to directly achieve the practical application in civil engineering.
Drawings
The invention is further illustrated with reference to the following figures and examples:
FIG. 1 is a schematic overall structure diagram of an embodiment of the present invention;
FIG. 2 is a schematic diagram of a main body of an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a body of an embodiment of the present invention;
FIG. 4 is a bottom lid diagram according to an embodiment of the present invention;
FIG. 5 is a cross-sectional view of a bottom cap according to an embodiment of the invention.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1 to 5, an internal stress measuring device according to an embodiment of the present invention mainly includes a main body 1 and a bottom cover 2. The main body 1 and the bottom cover 2 are processed and finished through a 3D fused deposition printing technology and are designed integrally. The main body 1 comprises a first diaphragm 101, a first fiber grating sensor 103, a side wall 102 and a second diaphragm 104, wherein the side wall 102 is arranged around the outer ring of the first diaphragm 101, the first diaphragm 101 is fixedly connected to a side port of the side wall 102, the second diaphragm 104 is arranged in a space formed by the side wall 102 in a surrounding manner, a first cavity is defined by the first diaphragm 101, the side wall 102 and the second diaphragm 104, and the first cavity is a closed cavity. The first fiber grating sensor 103 is fixedly connected to the first diaphragm 101. When the first diaphragm 101 measures the overburden pressure of the soil, the first diaphragm 101 deforms after receiving the pressure, and the second diaphragm 104 does not interfere with the deformation of the first diaphragm 101 due to the arrangement of the first cavity, so that the first fiber grating sensor 103 can accurately measure the overburden pressure of the soil. The principle of measuring the pressure on the soil body is that the diaphragm deforms after being subjected to the pressure, and the first fiber grating sensor 103 in the diaphragm is driven to generate wavelength drift. The bottom cover 2 comprises a bottom cover diaphragm 201, a hollow cylinder 202 and a second fiber grating sensor 204, wherein the hollow cylinder 202 is arranged on the top surface of the bottom cover diaphragm 201, and the second fiber grating sensor 204 is fixedly connected to the inner side surface of the hollow cylinder 202. The hollow cylinder 202 is provided with a top cover, and the hollow cylinder 202 and the bottom cover 2 enclose a second cavity, which is a closed cavity. After the bottom cover 2 is closed with the main body 1, a third cavity is formed between the bottom cover 2 and the main body 1, and the third cavity is outside the hollow cylinder 202. The side wall 102 is provided with a water flow through hole 105 which only leads to the third cavity, water in the soil body flows into the third cavity from the water flow through hole 105, and because the second cavity is a closed cavity, water pressure difference is formed after the water flows in and acts on the hollow column 202 to drive the side face of the hollow column 202 to deform, and then the wavelength of the second fiber grating sensor 204 is shifted. The internal stress measuring device is set to be of a double-layer integrated structure, the first fiber grating sensor 103 and the second fiber grating sensor 204 are fixed in the device, the first fiber grating sensor 103 is in full contact with the first diaphragm 101 and the second fiber grating sensor 204 is in full contact with the hollow cylinder 202, and the first fiber grating sensor and the second fiber grating sensor are in cooperative deformation, so that the problem that the bare fiber grating is difficult to directly achieve practical application in civil engineering due to the characteristics of fragility, thinness, easy breaking, poor shearing resistance and the like is solved, the overlying pressure of a soil body can be measured, the water pressure of the lower portion of the soil body can also be measured, and the purpose of two purposes of one device is.
Preferably, the first diaphragm 101 is provided with a first groove, and the first fiber grating sensor 103 is fixedly connected in the first groove. The inner side surface of the hollow cylinder 202 is provided with a second groove 203, and the second fiber grating sensor 204 is fixedly connected in the second groove 203. The first groove and the second groove 203 are arranged, so that the first fiber grating sensor 103 and the second fiber grating sensor 204 are more stably fixed, and the integration of the whole structure is facilitated.
With continued reference to fig. 2, preferably, the side wall 102 is provided with an output port 106, and the signal transmission tail fiber portion of the second fiber grating sensor 204 passes through the output port 106. The outlet 106 opens to the bottom of the body 1, the outlet 106 being located below the first cavity. The second groove 203 of the hollow cylinder 202 faces axially toward the output port 106 when the fiber grating sensor is mounted, so that the signal transmission tail fiber part of the second fiber grating sensor 204 can be aligned with the output port 106 to pass out. The output port 106 is a non-capping notch, which facilitates the second fiber grating sensor 204 to pass through smoothly when the bottom cover 2 and the main body 1 are installed.
Specifically, as the 3D fused deposition printing technology is adopted for processing, the first fiber grating sensor 103 and the main body 1 are integrally arranged, the first fiber grating sensor 103 is fixed and then continuously printed on the first fiber grating sensor 103, and the first fiber grating sensor 103 directly penetrates through the side wall 102.
Preferably, a protective handle 107 is disposed outside the side wall 102, and the protective handle 107 is disposed at the exit of the first fiber grating sensor 103. The protection handle 107 is in a groove strip shape, and the signal transmission tail fiber parts of the first fiber grating sensor 103 and the second fiber grating sensor 204 are all placed in the protection handle 107 and connected with a fiber grating demodulator. The protective handle 107 can prevent the penetrating portions of the first fiber grating sensor 103 and the second fiber grating sensor 204 from being damaged.
With continued reference to fig. 4 and 5, preferably, the hollow cylinder 202 is configured as a semi-cylindrical shape, the diameter of the hollow cylinder 202 is slightly smaller than the diameter of the bottom cap membrane 201, and the central axis of the hollow cylinder 202 coincides with the central axis of the bottom cap membrane 201. The internal stress measuring device is cylindrical, the center of the hollow cylinder 202 is arranged at the center of the bottom cover diaphragm 201, the third cavity is a semi-cylindrical space of the other half of the bottom cover diaphragm 201 corresponding to the hollow cylinder 202, and the second groove 203 on the hollow cylinder 202 is arranged on the straight line segment of the inner side surface of the semi-cylinder. When the bottom cover 2 and the main body 1 are installed, the arc side surface of the hollow column 202 is in close fit with the inner side surface of the side wall 102 of the main body 1.
Preferably, the side wall 102 of the third cavity is provided with a plurality of water flowing through holes 105, and the water flowing through holes face to the straight line section of the hollow cylinder 202, so that water can flow into one side of the straight line section of the hollow cylinder 202, water is present on two sides of the straight line section of the hollow cylinder 202, and the water flowing through holes are a cavity on the other side of the straight line section, so that a water pressure difference is formed, the straight line section is driven to deform, and the second fiber grating sensor 204 in the second groove 203 is driven to generate wavelength drift.
A method for manufacturing an internal stress measuring device mainly comprises the following steps:
(1) preparing by using a 3D printing device, firstly processing a first diaphragm 101 coated with pressure, printing the first diaphragm 101 with a certain thickness, arranging a first groove on the first diaphragm 101, wherein the first groove is used for laying a first fiber grating sensor 103, and pausing printing when the side wall 102 is printed;
(2) placing the first fiber grating sensor 103 in the first groove, determining the position, and fixing the first fiber grating sensor 103;
(3) continuously printing the side wall 102, printing the second membrane 104 after the side wall 102 is printed, enclosing a first cavity by the first membrane 101, the side wall 102 and the second membrane 104, continuously printing the side wall 102 upwards after the second membrane 104 is printed, wherein the side wall 102 is provided with an output hole 106 and a certain number of water flowing through holes 105 with a certain size;
(4) processing a bottom cover 2, printing a bottom cover diaphragm 201, printing a semicircular hollow cylinder 202 with the radius smaller than that of the bottom cover diaphragm 201 on the bottom cover diaphragm 201, namely, the shape is D-shaped, the hollow cylinder 202 is printed with an upper cover, a closed cavity is arranged in the hollow cylinder 202, and a second groove 203 is arranged on the straight line section on the inner side of the hollow cylinder 202 and used for placing a second fiber bragg grating sensor 204;
(5) the second fiber grating sensor 204 is placed in the second groove 203, the position is determined, and the second fiber grating sensor 204 is fixed.
The internal stress measuring device is processed from the first diaphragm 101 to the bottom of the main body 1, the first diaphragm 101 is located above the bottom cover 2, and the arrangement direction during processing is opposite to that during use. The manufacturing method of the internal stress measuring device shortens the processing period, greatly reduces the material waste, simplifies the manufacturing process, reduces the manufacturing cost, can design the required model at will, realizes the aim of two purposes of one sensor, and solves the problem that the bare fiber grating is difficult to directly achieve the practical application in civil engineering.
While the embodiments of the present invention have been described in detail with reference to the drawings, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (7)
1. An internal stress measuring apparatus, comprising:
the main body comprises a first diaphragm, a first fiber grating sensor, a side wall and a second diaphragm, wherein the side wall is arranged on the outer ring of the first diaphragm in a surrounding manner, the first diaphragm is arranged at one side port of the side wall, the second diaphragm is arranged in a space formed by the surrounding of the side wall, a first cavity is defined by the first diaphragm, the side wall and the second diaphragm, the first cavity is a closed cavity, and the first fiber grating sensor is fixedly connected to the first diaphragm; and
the bottom cover comprises a bottom cover diaphragm, a hollow cylinder and a second fiber grating sensor, the hollow cylinder is arranged on the top surface of the bottom cover diaphragm, the second fiber grating sensor is fixedly connected to the side surface of the hollow cylinder, the hollow cylinder is provided with a top cover, the hollow cylinder and the bottom cover enclose a second cavity, the second cavity is a closed cavity, a third cavity is formed between the bottom cover and the main body in a combined mode and is located on the outer side of the hollow cylinder, and the side wall of the bottom cover is provided with a water flow through hole only leading to the third cavity.
2. The internal stress measuring device of claim 1, wherein: the first diaphragm is provided with a first groove for placing a first fiber grating sensor, the inner side surface of the hollow cylinder is provided with a second groove, and the second fiber grating sensor is fixedly connected in the second groove.
3. The internal stress measuring device of claim 1, wherein: an output port is formed in the side wall, and the signal transmission tail fiber part of the second fiber bragg grating sensor penetrates out through the output port.
4. The internal stress measuring device of claim 3, wherein: and a protective handle is arranged on the outer side of the side wall and is arranged at the penetrating position of the first fiber bragg grating sensor.
5. The internal stress measuring device according to any one of claims 1 to 4, wherein: the hollow column is semi-cylindrical, the diameter of the hollow column is smaller than that of the bottom cover diaphragm, and the central axis of the hollow column coincides with that of the bottom cover diaphragm.
6. The internal stress measuring device of claim 5, wherein: and the side wall of the third cavity is provided with a plurality of water flowing through holes, and the water flowing through holes face to the straight line sections of the hollow cylinder.
7. A method for manufacturing an internal stress measuring device is characterized by comprising the following steps:
(1) the preparation method comprises the steps that a 3D printing device is used for preparing, a first diaphragm coated with pressure is processed firstly, the first diaphragm with a certain thickness is printed, a first groove is formed in the first diaphragm, the first groove is used for laying a first fiber grating sensor, and printing is suspended when the printing of the side wall is started;
(2) placing the first fiber grating sensor in the first groove, determining the position, and fixing the first fiber grating sensor;
(3) continuously printing the side wall, printing a second diaphragm after the side wall is printed, wherein the first diaphragm, the side wall and the second diaphragm enclose a first cavity, the side wall is continuously printed upwards after the second diaphragm is printed, and the side wall is provided with an output hole and a certain number of water flowing through holes with certain size;
(4) processing a bottom cover, printing a bottom cover diaphragm, printing a semicircular hollow cylinder with the radius smaller than that of the bottom cover diaphragm on the bottom cover diaphragm, namely printing the semicircular hollow cylinder with the shape of a D shape, wherein an upper cover is printed on the hollow cylinder, a closed cavity is formed in the hollow cylinder, and a second groove is formed in a straight line section on the inner side of the hollow cylinder and used for placing a second fiber bragg grating sensor;
(5) and placing the second fiber grating sensor in the second groove, determining the position, and fixing the second fiber grating sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010700422.5A CN112014011B (en) | 2020-07-20 | 2020-07-20 | Internal stress measuring device and preparation method thereof |
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| CN202010700422.5A CN112014011B (en) | 2020-07-20 | 2020-07-20 | Internal stress measuring device and preparation method thereof |
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| CN112014011B CN112014011B (en) | 2022-07-15 |
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| CN112729401A (en) * | 2020-12-25 | 2021-04-30 | 武汉理工大学 | Displacement and water pressure sensor based on 3D fused deposition technology and preparation method thereof |
| CN113358143A (en) * | 2021-06-07 | 2021-09-07 | 北京工业大学 | Automatic device of laying of optical fiber sensor of 3D printing concrete structure |
| CN115112485A (en) * | 2022-06-22 | 2022-09-27 | 中国水利水电科学研究院 | Soil strength, deformation characteristic and seepage characteristic integrated detection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112729401A (en) * | 2020-12-25 | 2021-04-30 | 武汉理工大学 | Displacement and water pressure sensor based on 3D fused deposition technology and preparation method thereof |
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| CN113358143A (en) * | 2021-06-07 | 2021-09-07 | 北京工业大学 | Automatic device of laying of optical fiber sensor of 3D printing concrete structure |
| CN115112485A (en) * | 2022-06-22 | 2022-09-27 | 中国水利水电科学研究院 | Soil strength, deformation characteristic and seepage characteristic integrated detection device |
| CN115112485B (en) * | 2022-06-22 | 2023-03-31 | 中国水利水电科学研究院 | Soil strength, deformation characteristic and seepage characteristic integrated detection device |
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| CN112014011B (en) | 2022-07-15 |
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