CN207763859U - A kind of Character of Cable Force of Cable stayed Bridge stress torsion detection sensor based on fiber grating - Google Patents
A kind of Character of Cable Force of Cable stayed Bridge stress torsion detection sensor based on fiber grating Download PDFInfo
- Publication number
- CN207763859U CN207763859U CN201820043328.5U CN201820043328U CN207763859U CN 207763859 U CN207763859 U CN 207763859U CN 201820043328 U CN201820043328 U CN 201820043328U CN 207763859 U CN207763859 U CN 207763859U
- Authority
- CN
- China
- Prior art keywords
- fiber grating
- cable
- stress
- stayed bridge
- character
- Prior art date
- 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.)
- Expired - Fee Related
Links
Landscapes
- Bridges Or Land Bridges (AREA)
Abstract
The Character of Cable Force of Cable stayed Bridge stress torsion detection sensor based on fiber grating that the utility model discloses a kind of, belong to technical field of optical fiber sensing, the first stress transmission element is equipped in sensor protecting case, second stress transmission element, torsion conversion element, first stress transmission element is connected with the first sensing element fiber grating, second stress transmission element is connected with the second sensing element fiber grating, torsion conversion element is connected with third sensing element fiber grating, first sensing element fiber grating, second sensing element fiber grating, one end of third sensing element fiber grating is connected with optical fiber pigtail respectively.The utility model may be implemented the measurement of measurand cable-stayed bridge rope stress torsion and with the characteristic from temperature compensation, simple in structure to have certain engineering application value.
Description
Technical field
The utility model belongs to technical field of optical fiber sensing, and in particular to a kind of Character of Cable Force of Cable stayed Bridge based on fiber grating is answered
Power torsion detection sensor.
Background technology
Pressure sensor method is as one of cable-stayed bridge rope mainstream detection method；However, pressure sensor is chronically at stress
State, because of fatigue effect, service life is limited, and expensive, can only in short-term be used under specific occasion.
Currently, due to fiber grating because its size is small, light-weight, electromagnetism interference, the essential advantages such as durability is good make
It shows preferable application prospect in terms of engineering detecting.But fiber grating detection technique cable-stayed bridge rope stress especially
Be in terms of its torsion detection be related to it is less.
Utility model content
Purpose of utility model：The purpose of this utility model is to provide a kind of Character of Cable Force of Cable stayed Bridge stress based on fiber grating
Torsion detection sensor not only may be implemented the detection of cable-stayed bridge rope stress torsion, and simple in structure be easy to implement engineer application.
Technical solution：To realize above-mentioned purpose of utility model, the utility model adopts the following technical solution：
A kind of Character of Cable Force of Cable stayed Bridge stress torsion detection sensor based on fiber grating, in the sensor protecting case
Inside be equipped with the first stress transmission element, the second stress transmission element, torsion conversion element, the first stress transmission element with
First sensing element fiber grating is connected, and the second stress transmission element is connected with the second sensing element fiber grating, institute
The torsion conversion element stated is connected with third sensing element fiber grating, the first sensing element fiber grating, second quick
Sensing unit fiber grating, third sensing element fiber grating one end be connected respectively with optical fiber pigtail.
The sensor protecting case includes shell outer wall, shell inner wall and protection cap.
The shell outer wall and shell inner wall form cavity, the first stress transmission element, the second stress transmission element,
Torsion conversion element is arranged in the cavity.
The first stress transmission element, the second stress transmission element, torsion conversion element both ends be separately fixed at
In upper and lower protection cap.
The optical fiber pigtail is drawn by optical fiber fairlead.
In the protection cap that the optical fiber fairlead is arranged above.
The sensor tightening member includes adjustable gib, adjustable counter-sunk screw and fixed counter-sunk screw；Described can
It adjusts counter-sunk screw and fixed counter-sunk screw that respectively adjustable gib one end is fixed on shell outer wall, spiral shell is immersed oneself in by the way that rotation is adjustable
Nail realizes action length of the adjustable gib between fixed counter-sunk screw and adjustable counter-sunk screw.
Advantageous effect：Compared with prior art, a kind of Character of Cable Force of Cable stayed Bridge stress based on fiber grating of the utility model
The measurement of measurand cable-stayed bridge rope stress torsion not only may be implemented in torsion detection sensor, but also with the spy from temperature compensation
Property, it is simple in structure；Because of the intrinsic propesties of its sensing element fiber grating --- the characteristics such as easy networking, far measuring distance are easy to group
Net realizes the measurement of extensive cable-stayed bridge rope, has certain engineering application value.
Description of the drawings
Fig. 1 is the 3-D view of the Character of Cable Force of Cable stayed Bridge stress torsion detection sensor of the fiber grating；
Fig. 2 is the 3-D view of sensor protecting case；
Fig. 3 is the front view of sensor tightening member.
Specific implementation mode
The utility model is described further with specific implementation example below in conjunction with the accompanying drawings.
As shown in Figs. 1-3, reference numeral is as follows：First stress transmission element 1, the second stress transmission element 2, torsion conversion
Element 3, the first sensing element fiber grating 4, the second sensing element fiber grating 5, third sensing element fiber grating 6, optical fiber
Tail optical fiber 7, optical fiber fairlead 8, sensor protecting case 9, sensor tightening member 10；Wherein, sensor protecting case 9 includes shell
Outer wall 91, shell inner wall 92 and protection cap 93；Sensor tightening member 10 includes adjustable gib 101, adjustable counter-sunk screw 102 and consolidates
Determine counter-sunk screw 103.
First stress transmission element 1, the second stress transmission element 2 realize the measurement of axial stress；Torsion conversion element 3 is real
The measurement of existing torsion, the first stress transmission element 1, the second stress transmission element 2 while realizing the measurement of axial stress,
It can ensure sensor by the way that whether fiber grating strain is identical on two stress transmission elements of analysis at the beginning of sensor installation
Axial direction is identical as measurand cable-stayed bridge rope axial direction.
As shown in figure 3,101 one end of adjustable gib is fixed on the shell of sensor protecting case 9 by fixed counter-sunk screw 103
On outer wall 91, adjustable counter-sunk screw 102 is similarly disposed on the shell outer wall 91 of sensor protection shell 9.Adjustable counter-sunk screw 102 can
Action length of the adjustable gib 101 between fixed counter-sunk screw 103 and adjustable counter-sunk screw 102 is realized with rotation.
A kind of Character of Cable Force of Cable stayed Bridge stress torsion detection sensor based on fiber grating, including be arranged outside sensor protection
First stress transmission element 1, the second stress transmission element 2, torsion conversion element 3 in shell 9, sensor protecting case 9 include shell
Outer wall 91, shell inner wall 92 and protection cap 93, shell outer wall 91 and shell inner wall 92 form cavity, the first stress transmission element 1, second
Stress transmission element 2, torsion conversion element 3 are arranged in the cavity, the first stress transmission element 1, the second stress transmission element
2, the both ends of torsion conversion element 3 are separately fixed in upper and lower protection cap 93.
First stress transmission element 1 is connected with the first sensing element fiber grating 4, the second stress transmission element 2 and second
Sensing element fiber grating 5 is connected, and torsion conversion element 3 is connected with third sensing element fiber grating 6, the first sensing element light
Fine grating 4, the second sensing element fiber grating 5, third sensing element fiber grating 6 one end be connected respectively with optical fiber pigtail 7,
Optical fiber pigtail 7 is drawn by optical fiber fairlead 8
In the protection cap 93 that optical fiber fairlead 8 is arranged above.
The course of work：1. according to the diameter of measurand cable-stayed bridge rope, 92 inner diameter size of shell inner wall is determined so that should
Sensor has certain universality；2. sensor installation is carried out with after cable-stayed bridge rope by adjusting sensor tightening member 10
Fastening；3. adjust sensor tightening member 10, adjustable gib 101 is responsible for limiting fixed direction fixation counter-sunk screw 103 not
Dynamic, the rotation of adjustable counter-sunk screw 102 is to adjust in adjustable gib 101 between adjustable counter-sunk screw 102 and fixed counter-sunk screw 103
Away from；4. sensor, when measurand cable-stayed bridge rope is by external forces after installation is complete, shell outer wall 91 experiences cable-stayed bridge rope
Suffered active force simultaneously passes it to protection cap 93；5. its suffered active force is acted on first be attached thereto and answered by protection cap 93
Power conversion element 1, the second stress transmission element 2, torsion conversion element 3, cause its surface to strain；6. the first stress transmission
Element 1, the second stress transmission element 2,3 surface strain of torsion conversion element variation cause the first sensing element fiber grating 4,
The drift of second sensing element fiber grating 5,6 centre wavelength of third sensing element fiber grating；7. optical fiber pigtail 7 passes through light
Fine fairlead 8 is by the first sensing element fiber grating 4, the second sensing element fiber grating 5, third sensing element fiber grating 6
Centre wavelength drift information sends out sensor；8. the first sensing element of back analysis fiber grating 4, the second sensing element optical fiber light
Grid 5,6 centre wavelength drift information of third sensing element fiber grating can obtain the big of active force suffered by measurand cable-stayed bridge rope
It is small.
After measurand cable-stayed bridge rope determines, can by adjusting shell inner wall 92 diameter so that involved by the utility model
And sensor can meet the measurements of different measurands；After sensor is installed on cable-stayed bridge rope, spiral shell is immersed oneself in by adjustable
Nail 102 adjusts the precompressed that adjustable gib 101 realizes the sensor, to ensure in stress torsion suffered by cable-stayed bridge rope and sensor shell
Effective transmission between wall.
The sensing implement body detection process basic overview is as follows：
(1) cable-stayed bridge rope stress mornitoring
Assuming that stress suffered by cable-stayed bridge rope is F, then the stress of the active force sensor shell inner wall 92 is similarly F, Jin Erzuo
Be F used in 93 active force of sensor shell protection cap, then stress transfer element 1, stress transfer element 2 and torsion conversion element 3
Active force is F.At this point, stress transfer element 1, stress transfer element 2 and torsion conversion element 3 its table under directed force F effect
Face strain stress1、ε2And ε3It is represented by：
In formula, E represents the elasticity modulus of stress transfer element 1, stress transfer element 2 and torsion conversion element 3； S1For
The cross-sectional area of stress transfer element 1；S2For the cross-sectional area of stress transfer element 2；S3For the cross section of torsion conversion element 3
Product.
It by fiber laser arrays basic theory and then can obtain, sensing element fiber grating 1, sensing element fiber grating 2 and sensitivity
The drift delta λ of 3 centre wavelength of element fiber grating1、Δλ2And Δ λ3It is represented by：
In formula, Δ T is the variation of measuring environment temperature residing for sensor, KεFor the sensitivity of grating strain, ξ is optical fiber light
Grid thermo-optical coeffecient, α are the coefficient of thermal expansion of optical fiber, θ be 3 axis of torsion conversion element and measurand cable-stayed bridge rope axis (i.e.
The axis direction of the sensor) between angle.
Simultaneous formula (1) (2) can obtain：
It can be obtained by solving formula (3)：
F=(Δ λ1-Δλ2)/(Kε/ES1-Kε/ES2)=(Δ λ1-Δλ3)/(Kε/ES1-Kε/ES3·cosθ) (4)
Can be obtained by formula (4) can must be tested by the drift value of back analysis sensing element fiber grating 1,2 and 3 centre wavelengths
The size of stress F suffered by object cable-stayed bridge rope, and its value is not influenced by measuring environment Δ T residing for sensor.
(2) cable-stayed bridge rope stress mornitoring
Assuming that torsion suffered by cable-stayed bridge rope is T, then the torsion of the active force sensor shell inner wall 92 is similarly T, Jin Erzuo
Be T used in 93 active force of sensor shell protection cap, then stress transfer element 1, stress transfer element 2 and torsion conversion element 3
Active force is T.At this point, stress transfer element 1, stress transfer element 2 and torsion conversion element 3 its table under active force T effects
Face strain stress1、ε2And ε3It is represented by：
In formula, l indicates the axial length value of the sensor.It by fiber laser arrays basic theory and then can obtain, sensing element light
The drift delta λ of 3 centre wavelength of fine grating 1, sensing element fiber grating 2 and sensing element fiber grating1、Δλ2And Δ λ3It can table
It is shown as：
Simultaneous formula (5) (6) can obtain：
It can be obtained by solving formula (7)：
T=(Δ λ1-Δλ3)/(Kε/ES3·sinθ) (8)
Can be obtained by formula (8) can must be tested by the drift value of back analysis sensing element fiber grating 1,2 and 3 centre wavelengths
The size of stress T suffered by object cable-stayed bridge rope, and its value is not influenced by measuring environment Δ T residing for sensor.
To sum up analysis can obtain, a kind of Character of Cable Force of Cable stayed Bridge stress torsion inspection based on fiber grating involved by the utility model
It surveys sensor and may be implemented the measurement of measurand cable-stayed bridge rope stress torsion, and its measured value is not by measuring ring residing for sensor
The influence of border Δ T is the sensor with the characteristic from temperature compensation.
Claims (7)
1. a kind of Character of Cable Force of Cable stayed Bridge stress torsion detection sensor based on fiber grating, it is characterised in that：It is protected including sensor
Shell (9) is protected, the first stress transmission element (1), the second stress transmission element are equipped in the sensor protecting case (9)
(2), torsion conversion element (3), the first stress transmission element (1) are connected with the first sensing element fiber grating (4), institute
The the second stress transmission element (2) stated is connected with the second sensing element fiber grating (5), the torsion conversion element (3) with
Third sensing element fiber grating (6) is connected, the first sensing element fiber grating (4), the second sensing element optical fiber light
Grid (5), third sensing element fiber grating (6) one end be connected respectively with optical fiber pigtail (7).
2. a kind of Character of Cable Force of Cable stayed Bridge stress torsion detection sensor based on fiber grating according to claim 1, special
Sign is：The sensor protecting case (9) includes shell outer wall (91), shell inner wall (92) and protection cap (93).
3. a kind of Character of Cable Force of Cable stayed Bridge stress torsion detection sensor based on fiber grating according to claim 2, special
Sign is：The shell outer wall (91) and shell inner wall (92) form cavity, and the first stress transmission element (1), second answer
Power conversion element (2), torsion conversion element (3) are arranged in the cavity.
4. a kind of Character of Cable Force of Cable stayed Bridge stress torsion detection sensor based on fiber grating according to claim 2, special
Sign is：The both ends point of the first stress transmission element (1), the second stress transmission element (2), torsion conversion element (3)
It is not fixed in upper and lower protection cap (93).
5. a kind of Character of Cable Force of Cable stayed Bridge stress torsion detection sensor based on fiber grating according to claim 1, special
Sign is：The optical fiber pigtail (7) is drawn by optical fiber fairlead (8).
6. a kind of Character of Cable Force of Cable stayed Bridge stress torsion detection sensor based on fiber grating according to claim 5, special
Sign is：In the protection cap (93) that the optical fiber fairlead (8) is arranged above.
7. a kind of Character of Cable Force of Cable stayed Bridge stress torsion detection sensor based on fiber grating according to claim 1, special
Sign is：Character of Cable Force of Cable stayed Bridge stress torsion detection sensor based on fiber grating is installed on after cable-stayed bridge rope and is passed by adjusting
Sensor tightening member (10) is fastened, and the sensor tightening member (10) includes adjustable gib (101), adjustable immerses oneself in spiral shell
Follow closely (102) and fixed counter-sunk screw (103)；The adjustable counter-sunk screw (102) and fixed counter-sunk screw (103) respectively will
Adjustable gib (101) one end is fixed on shell outer wall (91), and adjustable gib is realized by rotating adjustable counter-sunk screw (102)
(101) action length between fixed counter-sunk screw (103) and adjustable counter-sunk screw (102).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820043328.5U CN207763859U (en) | 2018-01-11 | 2018-01-11 | A kind of Character of Cable Force of Cable stayed Bridge stress torsion detection sensor based on fiber grating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820043328.5U CN207763859U (en) | 2018-01-11 | 2018-01-11 | A kind of Character of Cable Force of Cable stayed Bridge stress torsion detection sensor based on fiber grating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207763859U true CN207763859U (en) | 2018-08-24 |
Family
ID=63184045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820043328.5U Expired - Fee Related CN207763859U (en) | 2018-01-11 | 2018-01-11 | A kind of Character of Cable Force of Cable stayed Bridge stress torsion detection sensor based on fiber grating |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207763859U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107957306A (en) * | 2018-01-11 | 2018-04-24 | 盐城工学院 | A kind of Character of Cable Force of Cable stayed Bridge stress torsion detection sensor based on fiber grating |
-
2018
- 2018-01-11 CN CN201820043328.5U patent/CN207763859U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107957306A (en) * | 2018-01-11 | 2018-04-24 | 盐城工学院 | A kind of Character of Cable Force of Cable stayed Bridge stress torsion detection sensor based on fiber grating |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106705877B (en) | A kind of highly sensitive fiber Bragg grating strain sensor based on flexible hinge | |
| CN108663110B (en) | Fiber bragg grating acceleration sensor based on double-shaft flexible hinge and measurement method | |
| CN107121158B (en) | A kind of internal enclosed cantilever beam fiber-optic grating sensor | |
| US8234083B2 (en) | Wind turbine rotor blade comprising an edge-wise bending insensitive strain sensor system | |
| CN102121860A (en) | Corrugated diaphragm type pipe external pressure sensor, oil-water well casing external pressure monitoring device and method | |
| CN107907252A (en) | A kind of lever fiber bragg grating pressure sensor | |
| CN201837485U (en) | Fiber bragg grating detection system for temperature and depth of seawater | |
| CN207763859U (en) | A kind of Character of Cable Force of Cable stayed Bridge stress torsion detection sensor based on fiber grating | |
| CN112504306A (en) | Close-wound optical fiber type hypersensitive oil well sensing optical cable | |
| Liu et al. | FBG-based liquid pressure sensor for distributed measurement with a single channel in liquid environment | |
| CN203465450U (en) | Strain and temperature dual-parameter optical cable | |
| CN107421666A (en) | A kind of arcuately fiber bragg grating pressure sensor | |
| CN204902780U (en) | Optic fibre bragg grating array strain sensor of high sensitivity high resolution high accuracy | |
| Guo et al. | A fiber Bragg grating sensor for positive and negative displacement measurement | |
| CN201010859Y (en) | Intelligent bridge inhaul cable | |
| CN107957306A (en) | A kind of Character of Cable Force of Cable stayed Bridge stress torsion detection sensor based on fiber grating | |
| CN107014530A (en) | It is a kind of to realize axle power and shearing intelligent bolt and method from monitoring simultaneously | |
| CN206905946U (en) | A kind of arcuately fiber bragg grating pressure sensor | |
| Fujiwara et al. | Optical fiber anemometer based on a multi-FBG curvature sensor | |
| CN107870052A (en) | A kind of mini optical fibre method amber pressure sensor | |
| CN110411354B (en) | Optical fiber grating wide-range displacement monitoring device and system | |
| CN208736582U (en) | A kind of FBG tension sensor based on diplopore cantilever beam | |
| CN109373922A (en) | A kind of high-speed rail station optical fiber grating temperature compensation strain transducer | |
| CN206496754U (en) | A kind of wedge structure fiber grating dislocation meter | |
| CN112229345B (en) | Optical fiber grating inclination sensor free of vibration influence |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180824 Termination date: 20220111 |