CN110530622A - A kind of structural fatigue detection device based on fiber grating - Google Patents
A kind of structural fatigue detection device based on fiber grating Download PDFInfo
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- CN110530622A CN110530622A CN201910851078.7A CN201910851078A CN110530622A CN 110530622 A CN110530622 A CN 110530622A CN 201910851078 A CN201910851078 A CN 201910851078A CN 110530622 A CN110530622 A CN 110530622A
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- China
- Prior art keywords
- fiber
- grating
- detection device
- bragg grating
- device based
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Classifications
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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
- G01B11/165—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by means of a grating deformed by the object
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Optical Transform (AREA)
Abstract
A kind of structural fatigue detection device based on fiber grating, it is by straining at fiber-optic grating sensor measurement structure key point, strain value is output to computer by fiber Bragg grating (FBG) demodulator, and computer counts strain value using rain flow way, calculates the fatigue damage degree and remaining life of structure.Device strain measuring point has a very wide distribution, and structure is simple, easy to operate, is suitable for the fatigue detecting of various structures.
Description
Technical field:
The present invention relates to a kind of fatigue detection device, specifically a kind of structural fatigue based on fiber grating detects dress
It sets.
Background technique:
In the structures such as steel structure bridge, hoisting machinery, load-carrying vehicle, office can be caused since various big loads add to unload repeatedly
Portion's stress fatigue may cause the damage of structure, generate serious accident.It needs to carry out fatigue detecting thus.It is existing tired
Labor detection device mainly uses electrical measuring method, is a kind of relative measurement since resistance strain measurement principle is based on bridge balance,
Balancing is needed after being re-energised, is unable to get the logarithmic strain value of measuring point, it is impossible to be used in long-term detection.
Summary of the invention:
The purpose of the present invention is to solve the shortcomings of the prior art and providing a kind of structural fatigue inspection based on fiber grating
Survey device.The device uses the measuring principle of fiber grating, and absolute strain value can be obtained, and energy longtime running has a very wide distribution, ties
Structure is simple, easy to operate.
Technical solution of the present invention:
A kind of structural fatigue detection device based on fiber grating, it is characterised in that: glued at the key point to geodesic structure
Fiber Bragg grating strain sensor is pasted, each sensor is connected in series to by fiber Bragg grating (FBG) demodulator by optical fiber, obtains the strain of each measuring point
Value, computer are segmented strain value using rain flow way and count, and structure fatigue damage degree and remaining life are calculated.
The beneficial effects of the present invention are: compared with the prior art, the present invention is a kind of structural fatigue based on fiber grating
Detection device, can be obtained absolute strain value, and energy longtime running has a very wide distribution, structure is simple, easy to operate.
Detailed description of the invention:
Fig. 1 is structural schematic diagram of the invention.
Marked in the figure: 1 to geodesic structure, 2 fiber Bragg grating strain sensors, 3 fiber Bragg grating (FBG) demodulators, 4 computers.
Specific embodiment:
As shown in Figure 1, a kind of structural fatigue detection device based on fiber grating.Including 1 to geodesic structure, 2 fiber gratings
Strain transducer, 3 fiber Bragg grating (FBG) demodulators, 4 computers.
Fiber Bragg grating strain sensor 2 is pasted at the key point to geodesic structure 1, with optical fiber by fiber grating strain sensor
Device 2 is concatenated into fiber Bragg grating (FBG) demodulator 3, and fiber Bragg grating (FBG) demodulator 3 outputs signals to computer 4, and computer 4 uses rain flow way pair
Strain value segmentation statistics, calculates the fatigue damage degree and remaining life to geodesic structure 1.
The structural fatigue detection device working principle based on fiber grating is: being closed using distributed arrangement in structure
The fiber Bragg grating strain sensor of key point, fiber Bragg grating (FBG) demodulator measure the strain data of each position, computer calculate to
The fatigue damage degree and remaining life of geodesic structure.
Claims (1)
1. a kind of structural fatigue detection device based on fiber grating, it is characterized in that: being pasted at the key point to geodesic structure (1)
Fiber Bragg grating strain sensor (2) is concatenated into fiber Bragg grating (FBG) demodulator (3), light with optical fiber by fiber Bragg grating strain sensor (2)
Fine grating demodulation instrument (3) outputs signals to computer (4), and computer (4) is segmented strain value using rain flow way and counts, and calculates
Fatigue damage degree and remaining life to geodesic structure (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910851078.7A CN110530622A (en) | 2019-09-10 | 2019-09-10 | A kind of structural fatigue detection device based on fiber grating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910851078.7A CN110530622A (en) | 2019-09-10 | 2019-09-10 | A kind of structural fatigue detection device based on fiber grating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110530622A true CN110530622A (en) | 2019-12-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910851078.7A Pending CN110530622A (en) | 2019-09-10 | 2019-09-10 | A kind of structural fatigue detection device based on fiber grating |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110530622A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111023989A (en) * | 2019-12-09 | 2020-04-17 | 广州大学 | FRP-FBG strain sensor fatigue test device and method |
-
2019
- 2019-09-10 CN CN201910851078.7A patent/CN110530622A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111023989A (en) * | 2019-12-09 | 2020-04-17 | 广州大学 | FRP-FBG strain sensor fatigue test device and method |
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