CN103868445B - Long-scale-distance carbon fiber strain sensor - Google Patents
Long-scale-distance carbon fiber strain sensor Download PDFInfo
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- CN103868445B CN103868445B CN201410110787.7A CN201410110787A CN103868445B CN 103868445 B CN103868445 B CN 103868445B CN 201410110787 A CN201410110787 A CN 201410110787A CN 103868445 B CN103868445 B CN 103868445B
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- fiber strain
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- strain sensing
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Abstract
The invention discloses a long-scale-distance carbon fiber strain sensor which comprises a long-scale-distance carbon fiber strain sensor core wire, an anchorage section and a packaging layer. The two ends of the long-scale-distance carbon fiber strain sensor core wire are fixed to the anchorage section and packaged into the packaging layer in an insulating mode. The long-scale-distance carbon fiber strain sensor core wire is provided with a notch enabling the section of the long-scale-distance carbon fiber strain sensor core wire to be reduced in the fiber direction of the long-scale-distance carbon fiber strain sensor core wire, and the notch is the inner notch penetrating through the interior of the long-scale-distance carbon fiber strain sensor core wire or the outer notch formed in the outer surface of the long-scale-distance carbon fiber strain sensor core wire. The area of the notch is 0.5-5 percent that of the long-scale-distance carbon fiber strain sensor core wire. Long-term monitoring on small strain variation by the long-scale-distance carbon fiber strain sensor core wire is achieved, the long-scale-distance carbon fiber strain sensor has a sensing substrate and a packaging material which have the stable chemical quality, the measuring requirement for the small strain variation in long-term monitoring is met, and the precision of the sensor is improved.
Description
Technical field
The present invention relates in a kind of traffic engineering structure for civil engineering health detection and monitoring strain sensing devices, especially
It relate to a kind of meeting small strain measure of the change requirement, sound state high accuracy distributed long gauge length carbon fiber strain sensing
Device.
Background technology
In the structural health detection and monitoring system of civil engineering traffic engineering structure, stress (strain) change of structure, be
Important indicator for evaluation structure long-term behaviour and non-destructive tests.Strain transducer is to change the STRESS VARIATION of measurement object
One-tenth can measurement signal test instrunment.Conventional strain transducer mainly has the point type resistance strain gage based on electronic sensor.?
In practical application, because structure broad covered area, monitoring node are many, often lead to the high problem of monitoring cost.At present, one kind can be big
The long gauge length optical fibre sensor based on Fibre Optical Sensor of scope monitoring, is just gradually obtaining increasing in structural health system
Application.Long gauge length sensor is to reflect structure bulk deformation by mean strain in local measurement gauge length, and strain measurement is had
Very high required precision；On the other hand lay complete optical fiber sensing system and need again to put into certain early stage paving and build up simultaneously.
Now, a kind of high accuracy long gauge length strain transducer being suitable to original electronic sensor mode, it appears particularly important.
Carbon fiber is a kind of corrosion-resistant construction material of high intensity, also has mechanical resistance characteristic simultaneously, can be by conventional electricity
Bridge circuit realizes stress (strain) measurement.As a kind of new sensing material, not only sense than traditional metallic resistance strain-type
Device has more long-term stability, and carbon fibre material stress and the resistance variations that cause mostly come from change in resistance and
It is not the change in size of sensing heart yearn, therefore carbon fiber has compared with the metal sensor material of traditional resistor strain gauge transducer
Sensitivity height and the little feature of transversal effect.In the investigation of actual sensing capabilities, find logical with carbon fiber as base material
Long gauge length method for packing, makes long gauge length strain sensing heart yearn and meets stable strain measurement, can achieve little rank strain
The measurement of change.With regard to carbon fiber sense heart yearn introduction, refer to list of references [Wu Zhishen. a kind of distributed high-accuracy is long
Gauge-length carbon fiber strain detection testing device and method of testing: China, 201110371789.8 [p]. 2011-11-22.].
But it is the composite being passed through resin impregnated curing molding by thousands of microfibres in itself that carbon fiber senses heart yearn,
Affected by processing technology, the carbon fiber sensing heart yearn of molding has dispersed problem in the range of small strain, still can not meet 10
Small strain measurement requirement in microstrain.Therefore, it is necessary to take corresponding enhanced sensitivity measure with meet carbon fiber sensing heart yearn with regard to
The requirement of accuracy and precision in the range of small strain, to meet the requirement of structure distribution formula strain measurement.
Content of the invention
The purpose of the present invention is on the basis of long gauge-length carbon fiber strain sensing heart yearn strain measurement in the range of small strain
On, a kind of high-precision long gauge-length carbon fiber strain sensing devices are provided, realize dynamic static strain in the range of small strain and survey
Amount, with the requirement of the continuous detecting of the stress (strain) in civil engineering structure for the satisfaction and monitoring.
The present invention for achieving the above object, adopts the following technical scheme that
A kind of long gauge-length carbon fiber strain sensing devices, including long gauge-length carbon fiber strain sensing heart yearn, anchoring section and
Encapsulated layer, described long gauge-length carbon fiber strain sensing heart yearn two ends are fixed on anchoring section, and insulation-encapsulated is in encapsulated layer, its
It is characterised by: offering one along in machine direction in described long gauge-length carbon fiber strain sensing heart yearn makes described long gauge-length carbon fiber
The otch that strain sensing core section reduces, this otch is the inside within through described long gauge-length carbon fiber strain sensing heart yearn
Otch or the external undercut being arranged on described long gauge-length carbon fiber strain sensing heart yearn outer surface, the area of otch is described long mark
Away from carbon fiber strain sensing core section 0.5%～5%.
Described external undercut is annular incision or partial cut-out.
Described otch is 2 to 8cm along machine direction length；Its tangential direction width is more than 1mm, and is described long gauge length carbon
Fiber strain senses 15 to the 50% of heart yearn width.
Described incision site is more than 10mm away from described anchoring section.
Described otch before long gauge-length carbon fiber strain sensing heart yearn is impregnated with cutting in advance or impregnation after cutting.
Described long gauge-length carbon fiber strain sensing heart yearn is located within encapsulated layer, and having no interfacial friction can be with Free Transform.
It is packaged with the measurement electrode being connected with described long gauge-length carbon fiber strain sensing heart yearn in described anchoring section；Described
Electrode generation type be encapsulation before using viscosity little containing silver conductive adhesive in advance to described long gauge-length carbon fiber strain sensing heart yearn
The fibre bundle of two ends dry silk state does impregnation process and forms pre- impregnation section, directly welds wire after conducting resinl is fully cured again
Form electrode section in pre- impregnation section surface, reuse corrosion-resisting resin and stable electrode is formed to electrode section encapsulation.
The present invention locally has otch on the fibre length direction of long gauge-length carbon fiber strain sensing heart yearn so that long mark
Away from the reduced cross-sectional of carbon fiber strain sensing heart yearn local, according to stress concentration principle, when described sensing heart yearn tension, have
The local stress value of otch increases realizes overall signal amplification.
The beneficial effect of technical solutions according to the invention is:
(1) achieve the long term monitoring that long gauge-length carbon fiber strain sensing heart yearn changes for small strain, by having
Stablize sensing base material and the encapsulating material of chemical property, solve the measurement for small strain change in long term monitoring and want
Ask, improve senser element precision；
(2) when achieving the strain monitoring of large scale structure and detecting, multigroup senser element distribution is laid and is measured, and simplifies many
The bridge arrangement program of group senser element synchro measure, improves practical operation performance.
Brief description
Fig. 1 is the top view after the long gauge-length carbon fiber strain sensing devices encapsulation of 3 kinds of incision type of the present invention, wherein
A is annular breach, and b is circular-arc cut, and c is internal incision.
Fig. 2 is the long gauge-length carbon fiber strain sensing heart yearn incision size schematic diagram of the present invention.
Fig. 3 is the side view before the long gauge-length carbon fiber strain sensing devices encapsulation of the present invention.
Fig. 4 is the side view after the long gauge-length carbon fiber strain sensing devices encapsulation of the present invention.
Fig. 5 is the measuring circuit wiring schematic diagram of the long gauge-length carbon fiber strain sensing devices of multigroup present invention.
Fig. 6 is the amplification effect measured result of the long gauge-length carbon fiber strain sensing devices of the present invention.
Identifier in figure implication: the long gauge-length carbon fiber strain sensing heart yearn of 301- rectangular slits；302- circular-arc cut
Long gauge-length carbon fiber strain sensing heart yearn；The long gauge-length carbon fiber strain sensing heart yearn of 303- internal incision；2- anchoring section；
101- outer enclosure layer；102- enclosed inside layer；103- bottom package layer.
Specific embodiment
Below in conjunction with the accompanying drawings technical scheme is described in detail:
As shown in Figures 1 to 3, the long gauge-length carbon fiber strain sensing devices of the present invention include: two groups have identical dimensioning
Very little length is 50 centimetres to 2 meters have the long gauge-length carbon fiber strain sensing heart yearn 301 of rectangular slits and have inside and cut
The long gauge-length carbon fiber strain sensing heart yearn 303 of mouth, wherein has the long gauge-length carbon fiber strain sensing heart yearn 303 of internal incision
Use as temperature-compensating；Three layers of encapsulated layer: outer enclosure layer 101, enclosed inside layer 102 and bottom package layer 103, two bands
The anchoring section 2 of measuring electrode forms, and overall package forms in order.
As shown in figure 1, the kerf of the rectangle of the present invention long gauge-length carbon fiber strain sensing heart yearn is not single being limited to
Square or circular arc, its incision site is also not restricted to heart yearn edge or inside.
As shown in Fig. 2 the otch fiber side on the long gauge-length carbon fiber strain sensing heart yearn 301 of the rectangular slits of the present invention
It is 2 to 8cm to length；The tangential direction width of otch need to be more than 1mm, and is long gauge-length carbon fiber strain sensing heart yearn width
15 to 50%.
Optional position beyond anchoring section 10mm for the incision site of wherein long gauge-length carbon fiber strain sensing heart yearn；Otch
Can be long gauge-length carbon fiber strain sensing heart yearn impregnation before cutting in advance or impregnation after cutting.
Wherein it is packaged with anchoring section 2 and long gauge-length carbon fiber strain sensing heart yearn and the long gauge-length carbon fiber of temperature-compensating
The measurement electrode that strain sensing heart yearn connects.
As shown in figure 4, the long gauge-length carbon fiber strain sensing heart yearn of the present invention be located at encapsulated layer 102 and encapsulated layer 103 it
Interior, having no interfacial friction can be with Free Transform.
Wherein temperature-compensating is located within encapsulated layer 101 and encapsulated layer 102 with long gauge-length carbon fiber strain sensing heart yearn, and
No interfacial friction can be with Free Transform.
As shown in figure 5, the high accuracy of multigroup present invention long gauge-length carbon fiber strain sensing devices can circuit in parallel
Access in measuring bridge, realize distributed measurement.
With reference to a specific embodiment, specifically to illustrate the present invention long gauge-length carbon fiber strain sensing devices:
Example
The different incisions area of long gauge-length carbon fiber strain sensing in the present invention of to(for) a length of 500 millimeters of 3 gauge lengths
The result of the unidirectional tensioning load test of device can be seen that as shown in fig. 6, increasing with otch area, by long gauge length carbon
The signal that fiber strain senser element obtains has obvious effect of enhanced sensitivity, and its amplification gradually becomes with otch area change
Greatly, the signal and obtaining in whole measurement process linear very good.By correction coefficient, measurement of comparison result and setting
With reference to strain, find that the signal obtaining by long gauge-length carbon fiber strain sensing devices concordance in different measuring range is good
Good.
Claims (6)
1. a kind of long gauge-length carbon fiber strain sensing devices, including long gauge-length carbon fiber strain sensing heart yearn, anchoring section and envelope
Dress layer, described long gauge-length carbon fiber strain sensing heart yearn two ends are fixed on anchoring section, and insulation-encapsulated is in encapsulated layer, and it is special
Levy and be: offering one along in machine direction in described long gauge-length carbon fiber strain sensing heart yearn makes described long gauge-length carbon fiber answer
Become the otch that sensing core section reduces, this otch is that the inside within through described long gauge-length carbon fiber strain sensing heart yearn is cut
Mouth or the external undercut being arranged on described long gauge-length carbon fiber strain sensing heart yearn outer surface, the area of otch is described long gauge length
The 0.5%～5% of carbon fiber strain sensing core section, is packaged with described anchoring section and described long gauge-length carbon fiber strain sensing
The measurement electrode that heart yearn connects.
2. a kind of long gauge-length carbon fiber strain sensing devices according to claim 1 it is characterised in that: described outside is cut
Mouth is annular incision or partial cut-out.
3. a kind of long gauge-length carbon fiber strain sensing devices according to claim 1 and 2 it is characterised in that: described otch
It is 2 to 8cm along machine direction length；The tangential direction width of otch is more than 1mm, and is described long gauge-length carbon fiber strain sensing
15 to the 50% of heart yearn width.
4. a kind of long gauge-length carbon fiber strain sensing devices according to claim 1 and 2 it is characterised in that: described otch
Position is more than 10mm away from described anchoring section.
5. a kind of long gauge-length carbon fiber strain sensing devices according to claim 1 and 2 it is characterised in that: described otch
Long gauge-length carbon fiber strain sensing heart yearn impregnation before cutting in advance or impregnation after cutting.
6. a kind of long gauge-length carbon fiber strain sensing devices according to claim 1 and 2 it is characterised in that: described electrode
Generation type be encapsulation before using viscosity little containing silver conductive adhesive in advance to described long gauge-length carbon fiber strain sensing heart yearn two ends
The fibre bundle of dry silk state does impregnation process and forms pre- impregnation section, is directly welded at wire pre- after conducting resinl is fully cured again
Impregnation section surface forms electrode section, reuses corrosion-resisting resin and forms stable electrode to electrode section encapsulation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410110787.7A CN103868445B (en) | 2014-03-24 | 2014-03-24 | Long-scale-distance carbon fiber strain sensor |
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| CN201410110787.7A CN103868445B (en) | 2014-03-24 | 2014-03-24 | Long-scale-distance carbon fiber strain sensor |
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| CN105221854B (en) * | 2015-10-15 | 2017-06-13 | 武汉理工大学 | Continuous carbon fibre bundle makees the composite intelligent pipe of sensor |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101700744A (en) * | 2009-06-15 | 2010-05-05 | 中铁电气化局集团有限公司 | Ice-coating-proof contact line conducting wire and manufacturing method thereof |
| CN101943568A (en) * | 2009-06-10 | 2011-01-12 | 香港纺织及成衣研发中心 | Be used to detect the fiber strain sensor and the measuring system of big repeated deformation |
| CN102494603A (en) * | 2011-11-22 | 2012-06-13 | 东南大学 | Distributed high-precision long-gauge-length carbon fiber strain test device and method |
| CN103438815A (en) * | 2013-08-02 | 2013-12-11 | 东南大学 | Durable and long-scale-distance fiber grating sensor and manufacturing method thereof |
| CN103453833A (en) * | 2013-09-03 | 2013-12-18 | 东南大学 | Long-gauge length carbon fiber strain sensing device and method for testing same |
| CN103471497A (en) * | 2013-10-09 | 2013-12-25 | 东南大学 | Intelligent long scale distance strain sensor and manufacturing method thereof |
| CN203798310U (en) * | 2014-03-24 | 2014-08-27 | 东南大学 | Long-scale-distance carbon fiber strain sensing device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE202007019388U1 (en) * | 2006-11-02 | 2012-05-02 | Siemens Aktiengesellschaft | Apparatus for securing at least one flexion sensor belt on a body part, and a method of manufacturing a device for fastening two flexure sensor belts in parallel arrangement on a body part |
| JP5309168B2 (en) * | 2010-08-20 | 2013-10-09 | 株式会社フジクラ | Method of measuring hole diameter, hole position, hole surface roughness or bending loss of holey optical fiber, method of manufacturing holey optical fiber, and method of testing holey optical fiber optical line |
-
2014
- 2014-03-24 CN CN201410110787.7A patent/CN103868445B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101943568A (en) * | 2009-06-10 | 2011-01-12 | 香港纺织及成衣研发中心 | Be used to detect the fiber strain sensor and the measuring system of big repeated deformation |
| CN101700744A (en) * | 2009-06-15 | 2010-05-05 | 中铁电气化局集团有限公司 | Ice-coating-proof contact line conducting wire and manufacturing method thereof |
| CN102494603A (en) * | 2011-11-22 | 2012-06-13 | 东南大学 | Distributed high-precision long-gauge-length carbon fiber strain test device and method |
| CN103438815A (en) * | 2013-08-02 | 2013-12-11 | 东南大学 | Durable and long-scale-distance fiber grating sensor and manufacturing method thereof |
| CN103453833A (en) * | 2013-09-03 | 2013-12-18 | 东南大学 | Long-gauge length carbon fiber strain sensing device and method for testing same |
| CN103471497A (en) * | 2013-10-09 | 2013-12-25 | 东南大学 | Intelligent long scale distance strain sensor and manufacturing method thereof |
| CN203798310U (en) * | 2014-03-24 | 2014-08-27 | 东南大学 | Long-scale-distance carbon fiber strain sensing device |
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