CN112964904A - Acceleration detection device based on optical fiber - Google Patents
Acceleration detection device based on optical fiber Download PDFInfo
- Publication number
- CN112964904A CN112964904A CN202110179291.5A CN202110179291A CN112964904A CN 112964904 A CN112964904 A CN 112964904A CN 202110179291 A CN202110179291 A CN 202110179291A CN 112964904 A CN112964904 A CN 112964904A
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- CN
- China
- Prior art keywords
- optical fiber
- steel ring
- elastic material
- ring steel
- detection device
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 74
- 230000001133 acceleration Effects 0.000 title claims abstract description 51
- 238000001514 detection method Methods 0.000 title claims abstract description 27
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 51
- 239000010959 steel Substances 0.000 claims abstract description 51
- 239000013013 elastic material Substances 0.000 claims abstract description 30
- 230000002457 bidirectional effect Effects 0.000 claims description 9
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 239000000835 fiber Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/03—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses by using non-electrical means
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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
Abstract
The invention relates to an acceleration detection device based on optical fibers, which comprises an inner ring steel ring, an outer ring steel ring, optical fibers and an elastic material, wherein the inner ring steel ring is arranged on the outer ring steel ring; the inner ring steel ring is arranged in the outer ring steel ring; the optical fiber is arranged outside the inner ring steel ring and in the outer ring steel ring; the elastic material is arranged between the optical fiber and the outer ring steel ring. The invention utilizes the reverse Rayleigh scattering generated by the optical fiber due to the stress, and utilizes the stress and the position of the optical fiber to detect the direction and the magnitude of the acceleration, and the detection accuracy and the sensitivity are extremely high.
Description
Technical Field
The invention relates to the technical field of acceleration detection, in particular to an acceleration detection device based on optical fibers.
Background
An acceleration sensor is a device for measuring the acceleration of a moving object. The acceleration sensor is widely applied to the automobile industry, the aviation industry, mechanical vibration analysis and the like.
The working principle of the acceleration sensor is generally as follows: when the inertial mass is subjected to the action of external acceleration, the mass can generate displacement, and then the acceleration is obtained through conversion. Like other sensors, acceleration sensors indirectly derive acceleration that is difficult to measure directly from other easily measurable quantities. The structure of the device is mainly composed of an elastic sensitive element, a detection circuit, a shell and an auxiliary structure.
The existing acceleration sensor directly measures the relative displacement of the inertial mass or indirectly detects the deformation of the spring, and finally obtains the acceleration value of the measured object through a series of conversion relations. Typical acceleration sensors are classified into piezoresistive, piezoelectric, capacitive, and heat convection types. However, these types of acceleration sensors are complicated in design, relatively high in manufacturing cost due to strict requirements on material types, and often unsatisfactory in detecting the degree of fine assembly.
Disclosure of Invention
The invention aims to provide an acceleration detection device based on optical fibers, which can detect acceleration more accurately and sensitively.
In order to achieve the purpose, the invention provides the following scheme:
an acceleration detection device based on optical fibers comprises an inner ring steel ring, an outer ring steel ring, optical fibers and an elastic material;
the inner ring steel ring is arranged in the outer ring steel ring;
the optical fiber is arranged outside the inner ring steel ring and in the outer ring steel ring;
the elastic material is arranged between the optical fiber and the outer ring steel ring.
Optionally, the optical fiber-based acceleration detection apparatus further comprises a weight block; the weight block is disposed between the optical fiber and the elastic material.
Optionally, an area of an end of the weight block in contact with the optical fiber is smaller than an area of an end of the weight block in contact with the elastic material.
Optionally, the weight block is trapezoidal or conical in shape.
Optionally, the elastic material is provided in a plurality, and the elastic material is uniformly arranged between the optical fiber and the outer ring steel ring.
Optionally, the optical fiber-based acceleration detection apparatus further includes a bidirectional coupler, a light source, and a light detector;
one end of the bidirectional coupler is connected with the leading-out end of the optical fiber;
the other end of the bidirectional coupler is connected with the light source and the light detector.
Optionally, the bi-directional coupler, the light source and the light detector are disposed within the inner ring steel ring.
Optionally, the diameter of the inner ring steel ring is greater than 10 cm.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention discloses an acceleration detection device based on optical fibers, which comprises an inner ring steel ring, an outer ring steel ring, optical fibers and an elastic material, wherein the inner ring steel ring is arranged on the outer ring steel ring; the inner ring steel ring is arranged in the outer ring steel ring; the optical fiber is arranged outside the inner ring steel ring and in the outer ring steel ring; the elastic material is arranged between the optical fiber and the outer ring steel ring. The invention utilizes the reverse Rayleigh scattering generated by the optical fiber due to the stress, and utilizes the stress and the position of the optical fiber to detect the direction and the magnitude of the acceleration, and the detection accuracy and the sensitivity are extremely high.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a structural diagram of an acceleration detection device based on an optical fiber according to an embodiment of the present invention.
Description of the symbols:
1-inner ring steel ring, 2-outer ring steel ring, 3-optical fiber, 4-elastic material, 5-heavy object block, 6-bidirectional coupler, 7-light source, 8-light detector and 9-leading-out terminal.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the objects so described are interchangeable under appropriate circumstances. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
In the present disclosure, the drawings discussed below and the embodiments used to describe the principles of the present disclosure are for illustration purposes only and should not be construed to limit the scope of the present disclosure. Those skilled in the art will understand that the principles of the present invention may be implemented in any suitably arranged system. Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. Further, a terminal according to an exemplary embodiment will be described in detail with reference to the accompanying drawings. Like reference symbols in the various drawings indicate like elements.
The terms used in the description of the present invention are only used to describe specific embodiments, and are not intended to show the concept of the present invention. Unless the context clearly dictates otherwise, expressions used in the singular form encompass expressions in the plural form. In the present specification, it is to be understood that terms such as "comprising," "having," and "containing" are intended to specify the presence of stated features, integers, steps, acts, or combinations thereof, as taught in the present specification, and are not intended to preclude the presence or addition of one or more other features, integers, steps, acts, or combinations thereof. Like reference symbols in the various drawings indicate like elements.
The invention aims to provide an acceleration detection device based on optical fibers, which can detect acceleration more accurately and sensitively.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a structural diagram of an optical fiber-based acceleration detecting apparatus according to an embodiment of the present invention, and as shown in fig. 1, the optical fiber-based acceleration detecting apparatus includes an inner ring steel ring 1, an outer ring steel ring 2, an optical fiber 3, and an elastic material 4. The inner ring steel ring 1 is arranged in the outer ring steel ring 2, the optical fiber 3 is arranged outside the inner ring steel ring 1 and in the outer ring steel ring 2, and the elastic material 4 is arranged between the optical fiber 3 and the outer ring steel ring 2.
The device is horizontally placed when in use, when the device is not accelerated, the elastic material 4 does not deform, the optical fiber 3 is not stressed and does not deform, and the optical signal received by the optical fiber 3 is definite. When the device is accelerated in any direction, the elastic material 4 deforms under the action of inertia to keep the original motion state, (assuming that the direction of acceleration is from left to right, the elastic material 4 close to the left half circle is compressed, the elastic material 4 close to the right half circle is stretched, and the deformation of the elastic material 4 in the direction of acceleration is the largest), at the moment, the elastic material 4 generating deformation gives a stress to the optical fiber 3, the direction of the stress is opposite to the direction of acceleration, and the elastic material 4 generating shrinkage deformation is far away from the optical fiber 3 and does not give stress to the optical fiber 3. When the optical fiber 3 is deformed by stress, rayleigh backscattering will occur, wherein the scattered light due to the deformation will go through the same path back to be received by the photodetector, according to the formula:
wherein, Z is the distance of the optical fiber 3 deformation, c is the propagation speed of light in vacuum, n is the effective refractive index of the fiber core of the optical fiber 3, and t is the time difference between the incident light signal and the return light signal, so as to obtain the distance of the optical fiber 3 deformation and obtain the specific position of the deformation. When the optical fiber 3 is deformed at a certain position, rayleigh backscattering is caused at the position, the light intensity is attenuated at the position, bending loss is generated, and the stress magnitude can be obtained by detecting the loss. The magnitude and direction of the acceleration can be obtained according to the magnitude and position of the stress on the optical fiber 3. Namely, the direction of the acceleration is equal to the direction opposite to the connecting line of the centers of the circles of the inner and outer ring steel rings at the position point where the optical fiber 3 is stressed maximally, and the magnitude of the acceleration can be directly deduced according to the magnitude of the stress borne by the optical fiber 3.
In the present embodiment, the elastic material 4 is provided in plural, and the plural elastic materials 4 are uniformly provided between the optical fiber 3 and the outer ring steel ring 2. In addition, the acceleration detecting device based on the optical fiber further comprises a weight block 5, and the weight block 5 is arranged between the optical fiber 3 and the elastic material 4. Wherein the area of the end of the weight block 5 in contact with the optical fiber 4 is smaller than the area of the end of the weight block 5 in contact with the elastic material 4. When the apparatus is subjected to acceleration, since the end in contact with the optical fiber 3 is narrowed, the pressure is increased and the shape of the optical fiber 3 is largely changed under the same pressure. Smaller accelerations can also cause larger deformations of the optical fiber 3. And the one end that the 5 areas of heavy object pieces are less is connected with optic fibre 3 for when the device received the acceleration, optic fibre 3 will have the position point that receives the pressure the biggest and the position point that the tension is the biggest, because whole optic fibre 3 is in same environment, will effectually avoid the influence that environmental factor brought, improves detection accuracy. Further, the shape of the weight 5 is trapezoidal or tapered.
In this embodiment, the optical fiber-based acceleration detection apparatus further includes a bidirectional coupler 6, a light source 7, and a light detector 8. One end of the bidirectional coupler 6 is connected with the leading-out end 9 of the optical fiber 3, and the other end of the bidirectional coupler 6 is connected with the light source 3 and the optical detector 8. Wherein, the bidirectional coupler 6, the light source 7 and the light detector 8 are arranged in the inner ring steel ring 1.
In this embodiment, the diameter of the inner ring steel ring 1 is larger than 10 cm.
The present invention detects acceleration by measuring the reverse rayleigh scattering in the optical fiber due to stress, and has high accuracy and high sensitivity because the change of light is sensitive and accurate.
The invention mainly focuses on the point with the maximum pressure on the optical fiber when analyzing the corresponding relation between the acceleration and the stress, and the detection is simpler.
The invention is closed, is not interfered by the outside and corroded by the air, and the detection medium is the optical fiber, so the invention has the advantages of anti-interference, high sensitivity, high precision, strong reliability, long service life and the like.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to assist in understanding the core concepts of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. The acceleration detection device based on the optical fiber is characterized by comprising an inner ring steel ring, an outer ring steel ring, the optical fiber and an elastic material;
the inner ring steel ring is arranged in the outer ring steel ring;
the optical fiber is arranged outside the inner ring steel ring and in the outer ring steel ring;
the elastic material is arranged between the optical fiber and the outer ring steel ring.
2. The optical fiber-based acceleration detection device of claim 1, characterized in that it further comprises a weight block; the weight block is disposed between the optical fiber and the elastic material.
3. The optical fiber-based acceleration detection device according to claim 2, characterized in that the area of the end of the weight block in contact with the optical fiber is smaller than the area of the end of the weight block in contact with the elastic material.
4. The optical fiber-based acceleration detection device of claim 3, characterized in that the shape of the weight block is trapezoidal or conical.
5. The optical fiber-based acceleration detection device of claim 3, characterized in that said elastic material is provided in plurality, and a plurality of said elastic material is uniformly provided between said optical fiber and said outer ring steel.
6. The optical fiber based acceleration detection device of claim 1, characterized in that it further comprises a bi-directional coupler, a light source and a light detector;
one end of the bidirectional coupler is connected with the leading-out end of the optical fiber;
the other end of the bidirectional coupler is connected with the light source and the light detector.
7. The optical fiber-based acceleration detection device of claim 6, characterized in that said bi-directional coupler, said light source and said light detector are arranged within said inner ring of steel.
8. The optical fiber-based acceleration detection device of claim 1, characterized in that the inner ring steel ring has a diameter larger than 10 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110179291.5A CN112964904A (en) | 2021-02-09 | 2021-02-09 | Acceleration detection device based on optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110179291.5A CN112964904A (en) | 2021-02-09 | 2021-02-09 | Acceleration detection device based on optical fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112964904A true CN112964904A (en) | 2021-06-15 |
Family
ID=76284587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110179291.5A Withdrawn CN112964904A (en) | 2021-02-09 | 2021-02-09 | Acceleration detection device based on optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112964904A (en) |
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2021
- 2021-02-09 CN CN202110179291.5A patent/CN112964904A/en not_active Withdrawn
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Application publication date: 20210615 |