CN109373922A - A kind of high-speed rail station optical fiber grating temperature compensation strain transducer - Google Patents
A kind of high-speed rail station optical fiber grating temperature compensation strain transducer Download PDFInfo
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- CN109373922A CN109373922A CN201811369601.4A CN201811369601A CN109373922A CN 109373922 A CN109373922 A CN 109373922A CN 201811369601 A CN201811369601 A CN 201811369601A CN 109373922 A CN109373922 A CN 109373922A
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- grating
- base body
- optical fiber
- speed rail
- rail station
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/18—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge using photoelastic elements
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- Length Measuring Devices By Optical Means (AREA)
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Abstract
The invention belongs to sensor fields, a kind of high-speed rail station optical fiber grating temperature compensation strain transducer is provided, it is made of double optical fiber grating and pedestal, it is respectively the first base body and the second base body that the pedestal, which corresponds to two grid regions, first base body and the second base body head and the tail are connected integral, first base body is rectangular-shaped, rectangle both ends are provided with base aperture, first grating FBG 1 is pierced into from base aperture, first grating FBG 1 is used as strain measurement grating, second base body is cylindrical shape, limit hole there are two being set on stack shell, the center of circle of limit hole and the center of circle of base aperture are coaxial, second grating FBG 2 is pierced into from limit hole, second grating FBG 2 is used as temperature-compensating grating；The periphery of the pedestal is equipped with sleeve, and the sleeve is fixed on sleeve barrel fixed seat by anchor ear, which is welded on high-speed rail station tested point by anchor ear.The configuration of the present invention is simple, using solid and reliable, be able to achieve the accurate measurements to the strain of high-speed rail station.
Description
Technical field
The invention belongs to sensor fields, and in particular to a kind of high-speed rail station optical fiber grating temperature compensation strain transducer,
For high-speed rail station stress monitoring.
Background technique
High-speed rail station safety monitoring is always stubborn problem, especially such as high-speed rail station on Hainan ground, working environment
Badly, tempest rainy season is often met, many hidden danger are brought to the safety of high-speed rail station.And steel construction is most normal in high-speed rail station
With widest structure type, steel construction is one of the main reason for destroying steel construction durability by moderate finite deformation, therefore
Steel construction deformation is monitored, not only has great importance to the safety and reliability for improving steel construction, can also drop
The maintenance cost of low structure has objective economic benefit.
Traditional strain measurement such as electronics foil gauge, poor anti jamming capability are easy failure under harsh environments, increase
Big maintenance difficulty.Fiber grating has light weight, small in size, corrosion-resistant, electromagnetism interference, high sensitivity, high-resolution etc. excellent
Point has become one of the hot spot in strain monitoring field.
Current many fiber Bragg grating strain sensors, mounting means is usually gluing, but there are durabilities for gluing
Problem, the brittle easy failure under harsh environments.For high-speed rail station strong wind, moist adverse circumstances, ordinary sensors
Mounting means cisco unity malfunction in such a case, it is therefore desirable to a kind of solid and reliable ground connection type guarantees sensor
It can be worked normally in high-speed rail station.
The cross sensitivity of fiber grating is that strain measurement brings inconvenience, and people propose a variety of solutions to solve this problem
Certainly scheme, can be divided into two major classes on the whole, and one kind is strain, temperature simultaneously measuring method；Another kind of is to take temperature-compensating
Measure removes Bragg grating caused by temperature-compensating and changes, such as takes the encapsulating material of negative thermal expansion coefficient.Due to being difficult to look for
To accurately matched extraordinary encapsulating material, the application of this method are very limited with fiber optic materials thermal expansion coefficient, and
Cost is very high, and effect is also not highly desirable.
Summary of the invention
It is an object of the invention to overcome deficiency in the prior art, a kind of high-speed rail station optical fiber grating temperature compensation is provided
Strain transducer, structure is simple, using solid and reliable, is able to achieve the accurate measurements to the strain of high-speed rail station.
In order to achieve the above object, the technical solution adopted by the present invention is that: a kind of high-speed rail station optical fiber grating temperature compensation is answered
Become sensor, which is made of double optical fiber grating and pedestal, and the double optical fiber grating is set as two grid regions, and respectively the
One grating FBG 1 and the second grating FBG 2, it is respectively the first base body and the second base body that the pedestal, which corresponds to two grid regions,
First base body and the second base body head and the tail be connected it is integral, first base body be it is rectangular-shaped, be made of toughness material, square
Shape both ends are provided with base aperture, and the first grating FBG 1 is pierced into from base aperture, and the first grating FBG 1 is used as strain measurement grating, prestretching
2 ~ 3 nm are stretched, are fixed on the first base body using 353ND, second base body is cylindrical shape, is made of stainless steel, cylinder
Limit hole there are two setting with it, the center of circle of limit hole and the center of circle of base aperture are coaxial, and the second grating FBG 2 is pierced into from limit hole,
Second grating FBG 2 is located between two limit holes, and the second grating FBG 2 is used as temperature-compensating grating, and state is free state,
Not by stress；The both ends of the pedestal are equipped with sleeve barrel fixed seat, and the periphery of pedestal is equipped with sleeve, and the sleeve is fixed by anchor ear
On sleeve barrel fixed seat, anchor ear and sleeve use transition fit, which is welded on high-speed rail station tested point by anchor ear.
In the above-mentioned technical solutions, the sleeve is made of stainless steel or other corrosion resistant metal materials.
In the above-mentioned technical solutions, two threaded holes are opened on the anchor ear, for installing bolt.After grid region fixes, set
Anchor ear is set up from both ends respectively, using bolt by both ends banding, moves sleeve no longer, plays fixed work by upper bush
With.
In the above-mentioned technical solutions, the distance between the anchor ear of both ends is 20cm, and the length of the first grating FBG 1 is about 10mm, should
Enhanced sensitivity coefficient (strain amplification factor) K of sensor is 20.
The working principle of the invention:
Readings all first will be referring to an initial reading, therefore answers one initial reading of careful acquisition, preferably by sensor
It is mounted on the high-speed rail station structure to be measured surface for still locating light condition, such initial reading is corresponding with zero pressure, otherwise initially
Reading can be corresponding with unknown stress level.
For FBG2, which is in free state, not by extraneous stress, so only being acted on by temperature change, changes
Wavelength.In formula, 2For FBG2 variation wavelength value,FBG2 wavelength value can be read by (FBG) demodulator
,For FBG2 wavelength initial value, can be read by (FBG) demodulator.
For FBG1, which is also acted on by the variation of temperature not only by extraneous stress, and the wavelength of variation is—.In formula,For FBG1 variation wavelength value,For FBG1 wavelength value, can be read by (FBG) demodulator,
For FBG1 wavelength initial value, can be read by (FBG) demodulator.
The two makes the difference,, difference eliminates temperature bring wavelength change.
High-speed rail station optical fiber grating temperature compensation strain transducer of the present invention, structure is simple, easy to use, with the prior art
It compares, has the advantage that
1. the present invention is used and anchor ear is welded on high-speed rail station steel construction to be measured using the fixed sensor of anchor ear
Mode installs sensor, easy for installation, is adaptable to the severe working environment of high-speed rail station, improves measurement accuracy, increases and passes
The reliability and durability of sensor.
2. the present invention is designed using unique structure, there is strain amplification mechanism, the sensitive of sensor can be effectively improved
Degree.
3. the present invention uses double grid temperature compensation structure, double grid is worn to two limit holes and base aperture, it is pre- to measure grating
It being pasted on pedestal after stretching by 353ND, temperature-compensating grating, which is then in free state, acts on it only by the variation of temperature,
To guarantee the accuracy of measurement result.
Detailed description of the invention
Fig. 1 is the outline structural diagram of inventive sensor.
Fig. 2 is the base part schematic diagram of inventive sensor.
Fig. 3 is the double optical fiber grating partial schematic diagram of inventive sensor.
In figure: 1- tail optical fiber, 2- bolt, 3- anchor ear, 4- sleeve, the first base body of 5-, 6- base aperture, 7- limit hole, 8-
The second base body of FBG1,9-FBG2,10-, 11- sleeve barrel fixed seat.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail.Many details are explained in the following description in order to fully understand this hair
It is bright.But the invention can be embodied in many other ways as described herein, those skilled in the art can be
Without prejudice to doing similar improvement in the case where intension of the present invention, therefore the present invention is not limited to the specific embodiments disclosed below.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or may there are centering elements with inch.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term " and or " used herein includes one or more
Any and all combinations of relevant listed item.
As shown in Figures 1 to 3, the present embodiment provides a kind of high-speed rail station optical fiber grating temperature compensation strain transducer, the biographies
Sensor is made of double optical fiber grating and pedestal, and the double optical fiber grating is set as two grid regions, respectively FBG1 and FBG2, described
It is respectively the first base body 5 and the second base body 10 that pedestal, which corresponds to two grid regions, and the first base body 5 and the second base body 10 are first
Tail be connected it is integral, first base body 5 be it is rectangular-shaped, be made of toughness material, rectangle both ends are provided with base aperture 6, FBG1
It is pierced into from base aperture, FBG1 is pre-stretched 2 ~ 3 nm, is fixed on the first base body 5 using 353ND as strain measurement grating
On, second base body 10 is cylindrical shape, is made of stainless steel, and is set on stack shell there are two limit hole 7, the center of circle of limit hole 7
Coaxial with the center of circle of base aperture 6, FBG2 is pierced into from limit hole 7, and FBG2 is located between two limit holes 7, and FBG2 is as temperature
Null grating is spent, state is free state, not by stress.The both ends of the pedestal be equipped with sleeve barrel fixed seat 11, FBG1 and
FBG2's is each passed through that glue sealing after the sleeve barrel fixed seat at both ends is fixed, and the periphery of the pedestal is equipped with sleeve 4, and the sleeve 4 is adopted
It is made of stainless steel or other corrosion resistant metal materials, the sleeve 4 is fixed on sleeve barrel fixed seat 11 by anchor ear 3, is embraced
Hoop 3 and sleeve 4 use transition fit, two threaded holes are opened on the anchor ear 3, for installing bolt 2.
In the above-described embodiments, the distance between both ends anchor ear 3 is 20cm, and the length of FBG1 is about 10mm, the sensor
Enhanced sensitivity COEFFICIENT K is 20.
After grid region fixes, cover upper bush 4, by anchor ear 3 respectively from both ends set enter, then using bolt 2 by it firmly
It is fixed, prevent the both sides in measurement process mobile.Casing is put at tail optical fiber 1 after fixation, connects wire jumper.
The base portion of anchor ear 3 and high-speed rail station place to be measured are firmly welded tightly, to make sensor using welding manner
It can be worked normally under the adverse circumstances of strong wind humidity, improve its reliability and durability.
The content being not described in detail in this specification belongs to the prior art well known to those skilled in the art.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, all in spirit of the invention
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (4)
1. a kind of high-speed rail station optical fiber grating temperature compensation strain transducer, it is characterised in that: the sensor is by double optical fiber grating
It is constituted with pedestal, the double optical fiber grating is set as two grid regions, respectively the first grating and the second grating, and the pedestal is corresponding
In two grid regions be respectively the first base body and the second base body, the first base body and the second base body head and the tail be connected it is integral,
First base body be it is rectangular-shaped, be made of toughness material, rectangle both ends are provided with base aperture, and the first grating is worn from base aperture
Into, the first grating as strain measurement grating, 2 ~ 3 nm are pre-stretched, are fixed on the first base body using 353ND, described the
Two base bodies are cylindrical shape, are made of stainless steel, and are set on stack shell there are two limit hole, the center of circle of limit hole and the center of circle of base aperture
Coaxially, the second grating is pierced into from limit hole, and the second grating is located between two limit holes, and the second grating is as temperature-compensating light
Grid, state is free state, not by stress；The both ends of the pedestal are equipped with sleeve barrel fixed seat, and the periphery of pedestal is equipped with sleeve,
The sleeve is fixed on sleeve barrel fixed seat by anchor ear, and anchor ear and sleeve use transition fit, which is welded by anchor ear
It is connected on high-speed rail station tested point.
2. high-speed rail station optical fiber grating temperature compensation strain transducer according to claim 1, it is characterised in that: the set
Cylinder is made of stainless steel or other corrosion resistant metal materials.
3. high-speed rail station optical fiber grating temperature compensation strain transducer according to claim 1, it is characterised in that: described armful
Two threaded holes are opened on hoop, for installing bolt, fixes sleeve.
4. high-speed rail station optical fiber grating temperature compensation strain transducer according to claim 1, it is characterised in that: embrace at both ends
Distance between hoop is 20cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811369601.4A CN109373922A (en) | 2018-11-16 | 2018-11-16 | A kind of high-speed rail station optical fiber grating temperature compensation strain transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811369601.4A CN109373922A (en) | 2018-11-16 | 2018-11-16 | A kind of high-speed rail station optical fiber grating temperature compensation strain transducer |
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| Publication Number | Publication Date |
|---|---|
| CN109373922A true CN109373922A (en) | 2019-02-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811369601.4A Pending CN109373922A (en) | 2018-11-16 | 2018-11-16 | A kind of high-speed rail station optical fiber grating temperature compensation strain transducer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113188462A (en) * | 2021-05-08 | 2021-07-30 | 珠海澳大科技研究院 | Fiber grating sensing rod for three-dimensional deformation measurement and measurement method thereof |
| CN113218309A (en) * | 2021-01-15 | 2021-08-06 | 同济大学 | Structure and method for monitoring relative displacement between concrete road surface layers |
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| CN101787676A (en) * | 2010-02-08 | 2010-07-28 | 法尔胜集团有限公司 | Method for assembling cable built-in fiber bragg grating strain transducer |
| US20110243185A1 (en) * | 2009-09-30 | 2011-10-06 | Fasten Group Company, Ltd. | Bridge Intelligent Cable System with Built-In Fiber Grating Sensor |
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| CN106679583A (en) * | 2016-11-02 | 2017-05-17 | 北京信息科技大学 | Temperature-self-compensation fiber grating strain sensor |
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|---|---|---|---|---|
| US6108470A (en) * | 1998-10-26 | 2000-08-22 | Lucent Technologies Inc. | Article comprising temperature-compensated tunable grating and systems using such device |
| JP2003214907A (en) * | 2002-01-24 | 2003-07-30 | Ntt Advanced Technology Corp | Optical fiber sensor |
| US20090129722A1 (en) * | 2005-04-05 | 2009-05-21 | Jianzhong Hao | Fiber Bragg Grating Sensor |
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| JP2012225729A (en) * | 2011-04-19 | 2012-11-15 | Toyota Industries Corp | Fbg distortion sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113218309A (en) * | 2021-01-15 | 2021-08-06 | 同济大学 | Structure and method for monitoring relative displacement between concrete road surface layers |
| CN113188462A (en) * | 2021-05-08 | 2021-07-30 | 珠海澳大科技研究院 | Fiber grating sensing rod for three-dimensional deformation measurement and measurement method thereof |
| CN113188462B (en) * | 2021-05-08 | 2022-01-25 | 珠海澳大科技研究院 | Fiber grating sensing rod for three-dimensional deformation measurement and measurement method thereof |
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