CN113532724A - High-temperature and high-pressure resistant optical fiber force sensor - Google Patents
High-temperature and high-pressure resistant optical fiber force sensor Download PDFInfo
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- CN113532724A CN113532724A CN202110986844.8A CN202110986844A CN113532724A CN 113532724 A CN113532724 A CN 113532724A CN 202110986844 A CN202110986844 A CN 202110986844A CN 113532724 A CN113532724 A CN 113532724A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 71
- 238000012360 testing method Methods 0.000 claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 14
- 239000010959 steel Substances 0.000 claims abstract description 14
- 238000007789 sealing Methods 0.000 claims description 26
- 239000000835 fiber Substances 0.000 claims description 23
- 230000008859 change Effects 0.000 claims description 5
- 239000011324 bead Substances 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 239000007769 metal material Substances 0.000 claims description 3
- 230000000452 restraining effect Effects 0.000 claims description 3
- 239000000565 sealant Substances 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 4
- 239000000470 constituent Substances 0.000 description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
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- 238000005299 abrasion Methods 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
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
- G01L11/02—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by optical means
- G01L11/025—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by optical means using a pressure-sensitive optical fibre
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- General Physics & Mathematics (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Optical Transform (AREA)
Abstract
The invention discloses a high-temperature and high-pressure resistant optical fiber force sensor, which comprises an integrated force measuring component, a high-temperature optical fiber strain gauge and a push rod, wherein the integrated force measuring component is arranged on the high-temperature optical fiber strain gauge; the integrated force measuring component comprises a lower mounting seat and an upper mounting seat of the strain gauge which are integrally processed; the lower mounting seat and the upper mounting seat of the strain gauge are both of T-shaped structures, the free end of the vertical plate of the lower mounting seat of the strain gauge is opposite to the free end of the vertical plate of the upper mounting seat of the strain gauge, and a gap is formed between the two free ends; a stepped hole is formed in the top end of the top plate of the integrated force measuring component, the bottom end of the top plate of the integrated force measuring component is used as a force measuring beam, and a test piece is installed in the stepped hole and is in contact with the force measuring beam through a steel ball; the high-temperature optical fiber strain gauge is arranged on the free end of the vertical plate of the lower strain gauge mounting seat and the free end of the vertical plate of the upper strain gauge mounting seat. The optical fiber force sensor provided by the invention can stably work for a long time under the conditions of high temperature and high pressure, and has strong anti-electromagnetic interference capability and high measurement precision.
Description
Technical Field
The invention belongs to the technical field of sensing, and particularly relates to a high-temperature and high-pressure resistant optical fiber force sensor.
Background
The force is a direct cause of the change of the motion of the material, the force sensor can detect the mechanical quantity such as tension, pressure and the like, and becomes an indispensable component in power equipment, engineering machinery, various machine tools and industrial automation systems, and meanwhile, the force sensor is a core device for detecting the fatigue damage, the micro-motion damage and other damages of various structural parts. The risk associated with failure due to wear of the material of the structural members in the nuclear power plant accounts for 75% of the risk of failure of the entire nuclear power plant. The force sensor is utilized to realize the abrasion test of the key structural member material, so that the service life of the key parts of the nuclear power equipment is guaranteed, the structural design of the key parts of the nuclear power equipment is optimized, and the method has important significance for timely mastering the safety state of the nuclear power equipment.
Compared with the traditional electrical sensor, the optical fiber sensor has the advantages of strong anti-interference capability, small volume, high resolution ratio and the like, and simultaneously has good multi-sensor multiplexing capability, so the optical fiber sensor is widely applied to the industrial and military fields of aerospace, energy, buildings and the like. The optical fiber Fabry-Perot sensor is a typical representative of the optical fiber sensors, and various types of optical fiber Fabry-Perot sensors are appeared with the development of various high-precision processing and assembling technologies.
The optical fiber Fabry-Perot sensor can utilize different forms to construct a Fabry-Perot cavity, the sensor is flexible and changeable in form, can be used in various different measurement environments, is simple in structure, not easy to be influenced by the environment, high in resolution ratio and high in demodulation speed, and is widely applied to detection in the fields of various biology, medicine, aviation, aerospace, nuclear power and the like.
The existing optical fiber type force transducer cannot stably work in a water environment for a long time, has large volume, cannot be installed at a stressed part of a key component of nuclear power equipment, and has weak anti-electromagnetic interference capability; that is, the influence of the special working environment in the high-temperature and high-pressure water environment on the performance of the optical fiber force sensor is not considered in the conventional optical fiber force sensor, so that the conventional optical fiber force sensor is not suitable for the special working environment in the high-temperature and high-pressure water environment, and a high-temperature and high-pressure resistant optical fiber force sensor suitable for the high-temperature and high-pressure water environment is urgently needed to be provided.
Disclosure of Invention
The invention provides a high-temperature and high-pressure resistant optical fiber force sensor which can stably work for a long time under the conditions of high temperature and high pressure, and has strong anti-electromagnetic interference capability and high measurement precision.
The invention is realized by the following technical scheme:
a high-temperature and high-pressure resistant optical fiber force sensor comprises an integrated force measuring component, a high-temperature optical fiber strain gauge and a push rod;
the integrated force measuring component comprises a lower strain gauge mounting seat and an upper strain gauge mounting seat which are integrally processed;
the lower strain gauge mounting seat and the upper strain gauge mounting seat are both of T-shaped structures, a transverse plate of the lower strain gauge mounting seat is used as a bottom plate of the integrated force measuring part, a transverse plate of the upper strain gauge mounting seat is used as a top plate of the integrated force measuring part, a vertical plate free end of the lower strain gauge mounting seat and a vertical plate free end of the upper strain gauge mounting seat are oppositely arranged, and a gap is formed between the two free ends;
a stepped hole is formed in the top end of the top plate of the integrated force measuring component, the bottom end of the top plate of the integrated force measuring component is used as a force measuring beam, and a test piece is installed in the stepped hole and is in contact with the force measuring beam through a steel ball;
the high-temperature optical fiber strain gauge is arranged on the free end of the vertical plate of the lower strain gauge mounting seat and the free end of the vertical plate of the upper strain gauge mounting seat;
the push rod is fixedly connected with the bottom plate of the integrated force measuring component.
Preferably, the test piece is clamped and fixed by screws with wave beads which are uniformly arranged in the circumferential direction;
and pressure is arranged between the test piece and the force measuring beam, and the pressing sheet is used for restraining the steel balls so that the steel balls cannot slide but can rotate.
Preferably, the left and right sides of the integrated force measuring part of the present invention are sealed with metal sealing plates.
Preferably, a tail fiber sealing hole and a threaded blind hole are formed in a bottom plate of the integrated force measuring component;
the tail fiber sealing hole is used for sealing the optical fiber passing through the high-temperature optical fiber strain gauge;
the threaded blind hole is used for fixing the push rod.
Preferably, the end part of the push rod is provided with a threaded through hole corresponding to the threaded blind hole on the base plate of the integrated force measuring component; the push rod can be fixedly arranged at the bottom of the integrated force measuring component through the thread control and the thread blind hole;
and the push rod is provided with a tail fiber fixing groove corresponding to a tail fiber sealing hole on the integrated force measuring component bottom plate, and the optical fiber passing through the tail fiber sealing hole is led out through the tail fiber fixing groove.
Preferably, the high-temperature optical fiber strain gauge is arranged on the lower mounting seat and the upper mounting seat of the strain gauge in a spot welding mode;
when the sensor is acted by external force, the force acting on the test piece is transmitted to the force measuring beam through the steel balls, so that the gap between the mounting seat on the strain gauge and the mounting seat under the strain gauge is changed, the gap change is measured by the high-temperature optical fiber strain gauge, and the measured value of the high-temperature optical fiber strain gauge is processed to obtain the stress value of the sensor.
Preferably, two high-temperature optical fiber strain gauges are symmetrically arranged on the left side and the right side of the free end of the vertical plate of the lower strain gauge mounting seat and the free end of the vertical plate of the upper strain gauge mounting seat, so that the influence caused by the swinging of the force measuring beam is eliminated;
the optical fibers of the high-temperature optical fiber strain gauge symmetrically installed in the integrated force measuring component are led out from the tail part, are respectively led out through a tail fiber sealing hole in a sealing mode, and then are led out to the outside through a tail fiber fixing groove.
Preferably, the optical fiber of the present invention is fixed on the pigtail fixing groove by a high temperature sealant.
Preferably, the test piece of the present invention is made of a metal material.
Preferably, the number of the threaded blind holes and the threaded through holes is 4.
The invention has the following advantages and beneficial effects:
the Fabry-Perot fiber optic strain sensor is used as a force conversion device to replace a traditional electric strain gauge, so that the sensor is small in size, suitable for water environment and capable of resisting electromagnetic interference.
According to the invention, the two optical fiber sensing elements are arranged on the sensor mounting surface, so that the sensor can stably work for a long time in a high-temperature and high-pressure environment.
The invention adopts an integrated processing technology and a pressure membrane sealing technology, the highest working temperature of the sensor reaches 500 ℃, and the highest working pressure reaches 25 MPa.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic diagram of the sensor structure of the present invention.
FIG. 2 is a bottom view of the integrated force cell of the present invention.
Fig. 3 is a bottom view of the putter of the present invention.
Fig. 4 is a schematic diagram of the working principle of the sensor of the present invention.
Reference numbers and corresponding part names in the drawings:
1-test piece, 2-wave bead screw, 3-force measuring part, 3-1-tail fiber sealing hole, 3-2-lower mounting seat, 3-3-upper mounting seat, 3-4-force measuring beam, 3-5-threaded blind hole, 4-push rod, 4-1-tail fiber fixing groove, 4-2-threaded through hole, 5-high temperature optical fiber strain gauge, 5-1-optical fiber, 6-metal sealing plate and 7-steel ball.
Detailed Description
Hereinafter, the term "comprising" or "may include" used in various embodiments of the present invention indicates the presence of the invented function, operation or element, and does not limit the addition of one or more functions, operations or elements. Furthermore, as used in various embodiments of the present invention, the terms "comprises," "comprising," "includes," "including," "has," "having" and their derivatives are intended to mean that the specified features, numbers, steps, operations, elements, components, or combinations of the foregoing, are only meant to indicate that a particular feature, number, step, operation, element, component, or combination of the foregoing, and should not be construed as first excluding the existence of, or adding to the possibility of, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
In various embodiments of the invention, the expression "or" at least one of a or/and B "includes any or all combinations of the words listed simultaneously. For example, the expression "a or B" or "at least one of a or/and B" may include a, may include B, or may include both a and B.
Expressions (such as "first", "second", and the like) used in various embodiments of the present invention may modify various constituent elements in various embodiments, but may not limit the respective constituent elements. For example, the above description does not limit the order and/or importance of the elements described. The foregoing description is for the purpose of distinguishing one element from another. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of various embodiments of the present invention.
It should be noted that: if it is described that one constituent element is "connected" to another constituent element, the first constituent element may be directly connected to the second constituent element, and a third constituent element may be "connected" between the first constituent element and the second constituent element. In contrast, when one constituent element is "directly connected" to another constituent element, it is understood that there is no third constituent element between the first constituent element and the second constituent element.
The terminology used in the various embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the various embodiments of the invention. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Examples
The working environment of the key structure in the nuclear power equipment is a high-temperature and high-pressure water environment, the installation space between the structural parts is narrow, higher requirements are provided for the working temperature, the volume and the like of the force sensor, the existing force sensor can not stably work in the water environment for a long time although high temperature and high pressure resistance can be realized, the size is large, the existing force sensor cannot be installed at the stress position of the key part of the nuclear power equipment, and the anti-electromagnetic interference capability is weak.
As shown in fig. 1 to 3, the optical fiber force sensor of the present embodiment mainly includes an integrated force measuring part 3, a high-temperature optical fiber strain gauge 5, and a push rod 4.
The integrated force measuring component 3 comprises a strain gauge lower mounting seat 3-2 and a strain gauge upper mounting seat 3-3 which are integrally processed.
The lower mounting seat 3-2 of the strain gauge is of a T-shaped structure and is composed of a transverse plate and a vertical plate which are vertical to each other; the transverse plate is used as a bottom plate of the integrated measuring component 3, a tail optical fiber sealing hole 3-1 and a threaded blind hole 3-5 are formed in the transverse plate, the tail optical fiber sealing hole 3-1 is used for sealing an optical fiber 5-1 penetrating through the optical fiber strain gauge 5, and the threaded blind hole 3-5 is used for fixedly connecting a push rod 4; the vertical plate is vertical to the center of the transverse plate.
The strain gage mounting seat 3-3 is of a T-shaped structure and is composed of a transverse plate and a vertical plate which are perpendicular to each other; a step hole is formed in the middle of one end (namely the top end of the integrated force measuring component 3) far away from the vertical plate of the transverse plate along the thickness direction of the transverse plate, the step hole is used for mounting a test piece 1, one end of the transverse plate, which is in contact with the vertical plate, is used as a force measuring beam 3-4, and the rear surface of the test piece 1 is in contact with the center of the force measuring beam 3-4 through a steel ball 7 and is used for transmitting stress; the pressing sheet 8 is installed between the test piece 1 and the force measuring beams 3-4 in a threaded manner and is used for restraining the steel balls 7 so that the steel balls cannot slide but can rotate; the vertical plate is vertical to the center of the force measuring beam 3-4.
The test piece 1 is clamped and fixed by screws 2 with beads uniformly arranged along the circumferential direction thereof.
The free end of the vertical plate of the lower mounting seat 3-2 of the strain gauge is opposite to the free end of the vertical plate of the upper mounting seat 3-3 of the strain gauge, and a gap is formed between the free ends of the two vertical plates.
The left and right sides of the integrated force measuring unit 3 are sealed with metal sealing plates 6.
The end part of the push rod 4 is provided with a threaded through hole 4-2 corresponding to a threaded blind hole 3-5 on the bottom plate of the integrated force measuring component 3 (as shown in fig. 2 and 3, 4 threaded blind holes 3-5 are arranged on the bottom plate of the integrated force measuring component 3, 4 threaded through holes 4-2 are correspondingly arranged at the end part of the push rod 4, a fastener is adopted to penetrate through the threaded through holes and the threaded blind holes, and then the push rod 4 is fastened to the bottom part of the integrated force measuring component 3), and the push rod 4 can be fixedly arranged at the bottom part of the integrated force measuring component 3 through the threaded through hole 4-2; the push rod 4 is also provided with a tail fiber fixing groove 4-1 corresponding to a tail fiber sealing hole 3-1 on the bottom plate of the integrated force measuring component 3.
A high-temperature optical fiber strain gauge 5 is arranged at the free end of the vertical plate of the lower strain gauge mounting seat 3-2 and the free end of the vertical plate of the upper strain gauge mounting seat 3-3 in a spot welding mode, so that the strain transfer effect of the sensor is improved; in order to eliminate the influence caused by the swinging of the force measuring beam 3-4, two high-temperature optical fiber strain gauges 5 (the symmetry axis is the central line of two vertical plates) are symmetrically arranged on the left and right sides of the free end of the vertical plate of the lower strain gauge mounting seat 3-2 and the free end of the vertical plate of the upper strain gauge mounting seat 3-3. The optical fibers 5-1 of the high-temperature optical fiber strain gauge 5 symmetrically installed in the integrated force measuring component 3 are led out from the tail part, are respectively led out through a tail fiber sealing hole 3-1 in a sealing mode, and then are led out to the outside through a tail fiber fixing groove 4-1.
The optical fiber 5-1 of this embodiment is fixed to the pigtail fixing groove by high temperature sealant.
The test piece 1 of the present embodiment uses, but is not limited to, a metal material.
As shown in fig. 4, the working principle of the sensor of this embodiment is specifically as follows:
when a test piece 1 of the sensor is stressed, the force is transmitted to the force measuring beam 3-4 through the steel ball 7, the force measuring beam 3-4 generates downward displacement, the displacement changes the distance between the mounting seat 3-3 on the strain gauge and the mounting seat 3-2 under the strain gauge (namely the distance between the free end of the vertical plate of the mounting seat 3-3 on the strain gauge and the free end of the vertical plate of the mounting seat 3-2 under the strain gauge), the change of the distance can enable the high-temperature optical fiber strain gauge 5 installed between the two mounting seats to generate strain signal output, so that the displacement change is obtained through the measurement of the high-temperature optical fiber strain gauge 5, and the stress value of the sensor can be calculated by combining with calibration data.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The high-temperature and high-pressure resistant optical fiber force sensor is characterized by comprising an integrated force measuring component (3), a high-temperature optical fiber strain gauge (5) and a push rod (4);
the integrated force measuring component (3) comprises a strain gauge lower mounting seat (3-2) and a strain gauge upper mounting seat (3-3) which are integrally processed;
the lower strain gauge mounting seat (3-2) and the upper strain gauge mounting seat (3-3) are both of T-shaped structures, a transverse plate of the lower strain gauge mounting seat (3-2) serves as a bottom plate of the integrated force measuring part (3), a transverse plate of the upper strain gauge mounting seat (3-3) serves as a top plate of the integrated force measuring part (3), a vertical plate free end of the lower strain gauge mounting seat (3-2) and a vertical plate free end of the upper strain gauge mounting seat (3-3) are oppositely arranged, and a gap exists between the two free ends;
a stepped hole is formed in the top end of a top plate of the integrated force measuring component (3), the bottom end of the top plate of the integrated force measuring component (3) is used as a force measuring beam (3-4), and a test piece (1) is installed in the stepped hole and is in contact with the force measuring beam (3-4) through a steel ball (7);
the high-temperature optical fiber strain gauge (5) is arranged on the free end of the vertical plate of the lower strain gauge mounting seat (3-2) and the free end of the vertical plate of the upper strain gauge mounting seat (3-3);
the push rod (4) is fixedly connected with the bottom plate of the integrated force measuring component (3).
2. The high-temperature and high-pressure resistant optical fiber force sensor as claimed in claim 1, wherein the test piece (1) is clamped and fixed by circumferentially and uniformly arranged screws (2) with wave beads;
and a pressure (8) is arranged between the test piece (1) and the force measuring beams (3-4), and the pressing sheet (8) is used for restraining the steel balls (7) so that the steel balls cannot slide but can rotate.
3. A high temperature and high pressure resistant optical fiber force sensor according to claim 1, wherein the left and right sides of the integrated force measuring component (3) are sealed by metal sealing plates (6).
4. The high-temperature and high-pressure resistant optical fiber force sensor as claimed in claim 1, wherein a tail fiber sealing hole (3-1) and a threaded blind hole (3-5) are arranged on a bottom plate of the integrated force measuring component (3);
the tail fiber sealing hole (3-1) is used for sealing the optical fiber (5-1) passing through the high-temperature optical fiber strain gauge (5);
the threaded blind holes (3-5) are used for fixing the push rod (4).
5. The high-temperature and high-pressure resistant optical fiber force sensor as claimed in claim 4, wherein the end of the push rod (4) is provided with a threaded through hole (4-2) corresponding to a threaded blind hole (3-5) on the bottom plate of the integrated force measuring component (3); the push rod (4) can be fixedly arranged at the bottom of the integrated force measuring component (3) through the thread control (4-2) and the thread blind hole (3-5);
the push rod (4) is provided with a tail fiber fixing groove (4-1) corresponding to a tail fiber sealing hole (3-1) in the bottom plate of the integrated force measuring component (3), and the optical fiber (5-1) passing through the tail fiber sealing hole (3-1) is led out through the tail fiber fixing groove (4-1).
6. The high-temperature and high-pressure resistant optical fiber force sensor according to claim 5, wherein the high-temperature optical fiber strain gauge (5) is mounted on the strain gauge lower mounting seat (3-2) and the strain gauge upper mounting seat (3-3) by spot welding;
when the sensor is acted by external force, the force acting on the test piece (1) is transmitted to the force measuring beam (3-4) through the steel ball (7), so that the gap between the mounting seat (3-3) on the strain gauge and the mounting seat (3-2) under the strain gauge is changed, the gap change is measured by the high-temperature optical fiber strain gauge (5), and the measured value of the high-temperature optical fiber strain gauge (5) is processed to obtain the stress value of the sensor.
7. The high-temperature and high-pressure resistant optical fiber force sensor as claimed in claim 5, wherein two high-temperature optical fiber strain gauges (5) are symmetrically arranged on the left and right sides of the free end of the riser of the strain gauge lower mounting seat (3-2) and the free end of the riser of the strain gauge upper mounting seat (3-3) so as to eliminate the influence caused by the swinging of the force measuring beam (3-4);
the optical fibers (5-1) of the high-temperature optical fiber strain gauge (5) symmetrically installed in the integrated force measuring component (3) are led out from the tail part, are respectively led out through a tail fiber sealing hole (3-1) in a sealing mode, and then are led out to the outside through a tail fiber fixing groove (4-1).
8. The high temperature and high pressure resistant optical fiber force sensor according to claim 5, wherein the optical fiber (5-1) is fixed on the pigtail fixing groove (4-1) by high temperature sealant.
9. A high temperature and high pressure resistant optical fiber force sensor according to claim 1, wherein the test piece (1) is made of metal material.
10. A high temperature and high pressure resistant optical fiber force sensor as claimed in claim 5, wherein the number of the threaded blind holes (3-5) and the threaded through holes (4-2) is 4.
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| CN202110986844.8A CN113532724B (en) | 2021-08-26 | 2021-08-26 | High-temperature-resistant high-pressure optical fiber sensor |
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| CN202110986844.8A CN113532724B (en) | 2021-08-26 | 2021-08-26 | High-temperature-resistant high-pressure optical fiber sensor |
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| CN113532724B CN113532724B (en) | 2023-08-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114720032A (en) * | 2022-03-27 | 2022-07-08 | 重庆大学 | Optical fiber Fabry-Perot force sensing system |
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