CN113532724B - High-temperature-resistant high-pressure optical fiber sensor - Google Patents
High-temperature-resistant high-pressure optical fiber sensor Download PDFInfo
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- CN113532724B CN113532724B CN202110986844.8A CN202110986844A CN113532724B CN 113532724 B CN113532724 B CN 113532724B CN 202110986844 A CN202110986844 A CN 202110986844A CN 113532724 B CN113532724 B CN 113532724B
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- force measuring
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 68
- 238000012360 testing method Methods 0.000 claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 14
- 239000010959 steel Substances 0.000 claims abstract description 14
- 239000000835 fiber Substances 0.000 claims description 25
- 238000007789 sealing Methods 0.000 claims description 24
- 239000011324 bead Substances 0.000 claims description 4
- 230000008859 change Effects 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 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 239000000470 constituent Substances 0.000 description 7
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000014509 gene expression Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optical Transform (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The application discloses a high-temperature-resistant high-pressure optical fiber 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 an integrally processed lower mounting seat of the strain gauge and an upper mounting seat of the strain gauge; the lower mounting seat of the strain gauge and the upper mounting seat of the strain gauge are of T-shaped structures, the free ends of the vertical plates of the lower mounting seat of the strain gauge and the free ends of the vertical plates of the upper mounting seat of the strain gauge are arranged oppositely, and a gap exists between the two free ends; the top end of the top plate of the integrated force measuring component is provided with a stepped hole, the bottom end of the top plate of the integrated force measuring component is used as a force measuring beam, a test piece is arranged in the stepped hole, and the test piece is contacted with the force measuring beam through steel balls; the high-temperature optical fiber strain gauge is arranged on the free end of the vertical plate of the lower mounting seat of the strain gauge and the free end of the vertical plate of the upper mounting seat of the strain gauge. The optical fiber force sensor provided by the application can stably work for a long time under the conditions of high temperature and high pressure, and has strong electromagnetic interference resistance and high measurement accuracy.
Description
Technical Field
The application belongs to the technical field of sensing, and particularly relates to a high-temperature-resistant high-pressure optical fiber sensor.
Background
The force is a direct cause of the motion change of substances, the force sensor can detect mechanical quantities such as tension, pressure and the like, and the force sensor becomes an indispensable component in power equipment, engineering machinery, various working machines and industrial automation systems, and is a core device for detecting damages such as fatigue damage, micro-damage and the like of various structural members. The risk associated with failure due to wear of structural materials in nuclear power plants represents 75% of the failure risk of the entire nuclear power plant. The abrasion test of the key structural member materials is realized by using the force sensor, so that the method has important significance for guaranteeing the service life of key components of the nuclear power equipment and optimizing the structural design of the key components and timely grasping 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 and the like, and simultaneously has good multi-sensor multiplexing capability, so that the optical fiber sensor is widely applied to the fields of aerospace, energy, construction and the like, such as industry and military. Optical fiber fabry-perot sensors are typical representatives of the optical fiber sensors, and various types of optical fiber fabry-perot sensors have emerged with the development of various high precision processing and assembly techniques.
The optical fiber Fabry-Perot sensor can be used for constructing Fabry-Perot cavities in different modes, is flexible and changeable in form, can be used for various different measuring environments, is simple in structure, is not easily affected by the environments, is high in resolution and demodulation speed, and is widely applied to detection in various fields of biology, medicine, aviation, aerospace, nuclear power and the like.
The existing optical fiber type force transducer cannot stably work in water environment for a long time, has large volume, cannot be installed at the stress part of key parts of nuclear power equipment, and has weak electromagnetic interference resistance; that is, the existing optical fiber type force sensor does not consider the influence of the special working environment under the high-temperature and high-pressure water environment on the performance of the optical fiber type force sensor, so that the existing optical fiber type force sensor is not suitable for the special working environment under the high-temperature and high-pressure water environment, and the high-temperature and high-pressure resistant optical fiber sensor suitable for the high-temperature and high-pressure water environment is needed to be provided.
Disclosure of Invention
The application provides a high-temperature-resistant high-pressure optical fiber sensor, which can stably work for a long time under the conditions of high temperature and high pressure, and has strong electromagnetic interference resistance and high measurement precision.
The application is realized by the following technical scheme:
a high-temperature-resistant high-pressure optical fiber sensor comprises an integrated force measuring component, a high-temperature optical fiber strain gauge and a push rod;
the integrated force measuring component comprises an integrally processed lower mounting seat of the strain gauge and an upper mounting seat of the strain gauge;
the lower mounting seat of the strain gauge and the upper mounting seat of the strain gauge are of T-shaped structures, the transverse plate of the lower mounting seat of the strain gauge is used as a bottom plate of the integrated force measuring component, the transverse plate of the upper mounting seat of the strain gauge is used as a top plate of the integrated force measuring component, the free ends of the vertical plates of the lower mounting seat of the strain gauge and the free ends of the vertical plates of the upper mounting seat of the strain gauge are arranged oppositely, and a gap exists between the two free ends;
the top end of the top plate of the integrated force measuring component is provided with a stepped hole, the bottom end of the top plate of the integrated force measuring component is used as a force measuring beam, a test piece is arranged in the stepped hole, and the test piece is contacted with the force measuring beam through steel balls;
the high-temperature optical fiber strain gauge is arranged on the free end of the vertical plate of the lower mounting seat of the strain gauge and the free end of the vertical plate of the upper mounting seat of the strain gauge;
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 bolts with wave beads which are uniformly arranged in the circumferential direction;
and a pressure is arranged between the test piece and the force measuring beam, and the pressing piece is used for restraining the steel balls so that the steel balls cannot slide but can rotate.
Preferably, the left side and the right side of the integrated force measuring component are sealed by adopting metal sealing plates.
Preferably, a bottom plate of the integrated force measuring component is provided with a tail fiber sealing hole and a threaded blind hole;
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 bottom 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 a tail fiber fixing groove corresponding to the tail fiber sealing hole on the bottom plate of the integrated force measuring component is formed in the push rod, 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 of the strain gauge 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 upper mounting seat of the strain gauge and the lower mounting seat of the strain gauge is changed, the gap 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, the application symmetrically installs two high-temperature optical fiber strain gauges on the left and right sides of the free end of the vertical plate of the lower mounting seat of the strain gauge and the free end of the vertical plate of the upper mounting seat of the strain gauge so as to eliminate the influence caused by the swinging of the force measuring beam;
the optical fibers of the high-temperature optical fiber strain gauges symmetrically arranged in the integrated force measuring component are led out from the tail part, respectively and hermetically led out through a tail fiber sealing hole, and then led out to the outside through a tail fiber fixing groove.
Preferably, the optical fiber is fixed on the tail fiber fixing groove by high-temperature sealant.
Preferably, the test piece of the present application is made of a metal material.
Preferably, the number of the threaded blind holes and the threaded through holes is 4.
The application has the following advantages and beneficial effects:
the optical fiber Fabry-Perot strain sensor is used as a force conversion device, and replaces the traditional electric strain gauge, so that the sensor not only becomes small in size and suitable for water environment, but also has electromagnetic interference resistance.
According to the application, two optical fiber sensitive elements are arranged on the sensor mounting surface, so that the sensor can stably work for a long time under high temperature and high pressure environment.
The application adopts an integrated processing technology and a pressure film sealing technology, the maximum working temperature of the sensor reaches 500 ℃, and the maximum working pressure reaches 25MPa.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:
fig. 1 is a schematic view of a sensor structure according to the present application.
Fig. 2 is a bottom view of the integrated force measuring device of the present application.
Fig. 3 is a bottom view of the putter of the present application.
Fig. 4 is a schematic diagram of the working principle of the sensor of the present application.
In the drawings, the reference numerals and corresponding part names:
the device comprises a 1-test piece, a 2-wave bead screw, a 3-force measuring component, a 3-1-tail fiber sealing hole, a 3-2-lower mounting seat, a 3-3-upper mounting seat, a 3-4-force measuring beam, a 3-5-threaded blind hole, a 4-push rod, a 4-1-tail fiber fixing groove, a 4-2-threaded through hole, a 5-high temperature optical fiber strain gauge, a 5-1-optical fiber, a 6-metal sealing plate and 7-steel balls.
Detailed Description
Hereinafter, the terms "comprises" or "comprising" as may be used in various embodiments of the present application indicate the presence of inventive functions, operations or elements, and are not limiting of the addition of one or more functions, operations or elements. Furthermore, as used in various embodiments of the application, the terms "comprises," "comprising," and their cognate terms are intended to refer to a particular feature, number, step, operation, element, component, or combination of the foregoing, and should not be interpreted as first excluding the existence of or increasing likelihood of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
In various embodiments of the application, 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", etc.) used in the various embodiments of the application may modify various constituent elements in the various embodiments, but the respective constituent elements may not be limited. For example, the above description does not limit the order and/or importance of the elements. The above description is only intended to distinguish one element from another element. 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 application.
It should be noted that: if it is described to "connect" one component element to another component element, a first component element may be directly connected to a second component element, and a third component element may be "connected" between the first and second component elements. Conversely, 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 application is for the purpose of describing particular embodiments only and is not intended to be limiting of the various embodiments of the application. As used herein, the singular is intended to include the plural 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 application belong. The terms (such as those defined in commonly used dictionaries) will be interpreted as having a meaning that is the same as the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in connection with the various embodiments of the application.
For the purpose of making apparent the objects, technical solutions and advantages of the present application, the present application will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present application and the descriptions thereof are for illustrating the present application only and are not to be construed as limiting the present application.
Examples
The working environment of key structure in nuclear power equipment is high temperature high pressure water environment, and the installation space between the structure is narrow and small, this puts forward higher requirement to the operating temperature and the volume etc. of force sensor, and current force sensor is though can realize high temperature and high pressure resistant, but can not work under water environment for a long time stably, and the volume is great, can not install the atress position at the key part of nuclear power equipment, electromagnetic interference resistance is weak, therefore this embodiment provides a high temperature high pressure resistant optical fiber sensor, the optical fiber sensor of this embodiment can be under water environment under high temperature high pressure's the long time stable operation, and have advantages such as electromagnetic interference resistance is strong, measurement accuracy is high.
As shown in fig. 1-3, 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 an integrally processed lower strain gauge mounting seat 3-2 and an upper strain gauge mounting seat 3-3.
The lower mounting seat 3-2 of the strain gauge is of a T-shaped structure and consists of a transverse plate and a vertical plate which are mutually perpendicular; the transverse plate is used as a bottom plate of the integrated measuring component 3, a tail fiber sealing hole 3-1 and a threaded blind hole 3-5 are formed in the transverse plate, the tail fiber sealing hole 3-1 is used for sealing an optical fiber 5-1 passing through an 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 perpendicular to the center of the transverse plate.
The mounting seat 3-3 on the strain gauge is of a T-shaped structure and consists of a transverse plate and a vertical plate which are mutually perpendicular; the middle part of one end (namely the top end of the integrated force measuring component 3) of the transverse plate, which is far away from the vertical plate, is provided with a stepped hole along the thickness direction of the transverse plate, the stepped hole is used for installing a test piece 1, one end of the transverse plate, which is contacted with the vertical plate, is used as a force measuring beam 3-4, and the rear surface of the test piece 1 is contacted 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 arranged between the test piece 1 and the force measuring beam 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 perpendicular to the center of the force measuring beam 3-4.
The test piece 1 is clamped and fixed by the bolts 2 with beads uniformly arranged along the circumferential direction.
The free ends of the risers of the lower mounting seat 3-2 of the strain gauge are opposite to the free ends of the risers of the upper mounting seat 3-3 of the strain gauge, and a gap exists between the free ends of the two risers.
The left and right sides of the integrated force measuring part 3 are sealed by metal sealing plates 6.
The end part of the push rod 4 is provided with threaded through holes 4-2 corresponding to the threaded blind holes 3-5 on the bottom plate of the integrated force measuring component 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 on the end part of the push rod 4, a fastener is adopted to pass through the threaded through holes and the threaded blind holes, and then the push rod 4 is fastened to the bottom of the integrated force measuring component 3), and the push rod 4 can be fixedly installed at the bottom of the integrated force measuring component 3 through the threaded through holes 4-2; the push rod 4 is also provided with a tail fiber fixing groove 4-1 corresponding to the tail fiber sealing hole 3-1 on the bottom plate of the integrated force measuring component 3.
The high-temperature optical fiber strain gauge 5 is arranged at the free end of the vertical plate of the lower mounting seat 3-2 of the strain gauge and the free end of the vertical plate of the upper mounting seat 3-3 of the strain gauge in a spot welding mode, so that the strain transmission effect of the sensor is improved; in order to eliminate the influence caused by the swinging of the force measuring beam 3-4, in this embodiment, two high-temperature optical fiber strain gages 5 (the symmetry axis is the center line of the two risers) are symmetrically installed at the left and right sides of the riser free end of the lower mounting seat 3-2 of the strain gage and the riser free end of the upper mounting seat 3-3 of the strain gage. The optical fibers 5-1 of the high-temperature optical fiber strain gauge 5 symmetrically arranged in the integrated force measuring component 3 are led out from the tail, respectively and hermetically led out through a tail fiber sealing hole 3-1, and then led out to the outside through a tail fiber fixing groove 4-1.
The optical fiber 5-1 of this embodiment is fixed on the pigtail fixing groove by high-temperature sealant.
The test piece 1 of the present embodiment adopts, but is not limited to, a metallic material.
As shown in fig. 4, the working principle of the sensor of this embodiment specifically includes:
when the 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 upper mounting seat 3-3 of the strain gauge and the lower mounting seat 3-2 of the strain gauge (namely, the distance between the free end of the vertical plate of the upper mounting seat 3-3 of the strain gauge and the free end of the vertical plate of the lower mounting seat 3-2 of the strain gauge), the change of the distance can enable the high-temperature optical fiber strain gauge 5 arranged between the two mounting seats to generate strain signal output, so that the displacement change is measured through the high-temperature optical fiber strain gauge 5, and the stress value of the sensor can be calculated by combining calibration data.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the application, and is not meant to limit the scope of the application, but to limit the application to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the application are intended to be included within the scope of the application.
Claims (6)
1. The high-temperature-resistant high-pressure optical fiber 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 an integrally processed lower mounting seat (3-2) of the strain gauge and an upper mounting seat (3-3) of the strain gauge;
the strain gauge lower mounting seat (3-2) and the strain gauge upper mounting seat (3-3) are of T-shaped structures, a transverse plate of the strain gauge lower mounting seat (3-2) is used as a bottom plate of the integrated force measuring component (3), a transverse plate of the strain gauge upper mounting seat (3-3) is used as a top plate of the integrated force measuring component (3), and the free ends of a vertical plate of the strain gauge lower mounting seat (3-2) and the free ends of a vertical plate of the strain gauge upper mounting seat (3-3) are arranged oppositely, and a gap exists between the two free ends;
a stepped hole is formed in the top end of the 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), a test piece (1) is installed in the stepped hole, and the test piece is contacted 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 mounting seat (3-2) of the strain gauge and the free end of the vertical plate of the upper mounting seat (3-3) of the strain gauge;
the push rod (4) is fixedly connected with the bottom plate of the integrated force measuring component (3);
the test piece (1) is clamped and fixed by bolts (2) with wave beads which are uniformly arranged in the circumferential direction;
a pressing piece (8) is arranged between the test piece (1) and the force measuring beam (3-4), and the pressing piece (8) is used for restraining the steel balls (7) so that the steel balls cannot slide but can rotate;
a tail fiber sealing hole (3-1) and a threaded blind hole (3-5) are formed in the bottom plate of the integrated force measuring component (3);
the tail fiber sealing hole (3-1) is used for sealing an optical fiber (5-1) passing through the high-temperature optical fiber strain gauge (5);
the threaded blind hole (3-5) is used for fixing the push rod (4);
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); the push rod (4) can be fixedly arranged at the bottom of the integrated force measuring component (3) through the threaded through hole (4-2) and the threaded 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) on the bottom plate of the integrated force measuring component (3), and an optical fiber (5-1) passing through the tail fiber sealing hole (3-1) is led out through the tail fiber fixing groove (4-1);
the high-temperature optical fiber strain gauge (5) is arranged on the lower mounting seat (3-2) of the strain gauge and the upper mounting seat (3-3) of the strain gauge in a spot welding mode;
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 upper mounting seat (3-3) of the strain gauge and the lower mounting seat (3-2) of 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.
2. The high temperature and pressure resistant optical fiber 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).
3. The high temperature and high pressure resistant optical fiber sensor according to claim 1, wherein two high temperature optical fiber strain gauges (5) are symmetrically arranged at the left side and the right side 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) 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 arranged in the integrated force measuring component (3) are led out from the tail part and respectively led out in a sealing way through a tail fiber sealing hole (3-1), and then led out to the outside through a tail fiber fixing groove (4-1).
4. A high temperature and pressure resistant optical fiber sensor according to claim 1, characterized in that the optical fiber (5-1) is fixed on the pigtail fixing groove (4-1) by high temperature sealant.
5. A high temperature and pressure resistant optical fiber sensor according to claim 1, characterized in that the test piece (1) is made of metal material.
6. A high temperature and pressure resistant optical fiber sensor according to claim 1, characterized in that the number of blind threaded holes (3-5) and through threaded 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 true CN113532724B (en) | 2023-08-18 |
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