CN102506691B - Cement-based intelligent composite material strain sensor with temperature compensation function - Google Patents
Cement-based intelligent composite material strain sensor with temperature compensation function Download PDFInfo
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Abstract
The invention discloses a cement-based intelligent composite material strain sensor with a temperature compensation function, which comprises a strain monitoring module and a temperature monitoring module, wherein the strain monitoring module and the temperature monitoring module are formed by carbon-fiber cement-based intrinsic intelligent composite material and four parallel electrodes arranged on the composite material; and the strain monitoring module and the temperature monitoring module are connected and are respectively provided with four parallel electrodes. The cement-based intelligent composite material strain sensor has the advantages of temperature compensation function, high sensitivity coefficient, high voltage-sensitive and good performance stability, is applicable to strain monitoring of concrete structures under various environment conditions, avoids the defect of poor technical effect of a thermoelectric couple for directly measuring the temperature and carrying out temperature function, has the characteristics of high temperature compensation accuracy and simple technology and simultaneously improves the temperature compensation effect and the strain monitoring accuracy of the sensor under various strain conditions.
Description
Technical field
The present invention relates to a kind of strain transducer, particularly relate to a kind of cement based intelligent compound substance strain transducer with temperature compensation function, this strain transducer is for the strain monitoring of xoncrete structure.
Background technology
At present in civil engineering structure, be widely used resistance strain gage and monitor the strain of xoncrete structure, ripe, reliable and stable advantage possesses skills, but sensitivity of strain gauge is only 2-3, permanance is very poor, and mounting process is complicated, cost is higher, can't meet the technical need to the life-cycle long term monitoring of important civil engineering structure to people.And that cement based intelligent compound substance strain transducer has a sensitivity coefficient is high, fabulous permanance, advantage with low cost, and installation technics and data acquisition are simple, be the important means of the important civil engineering work xoncrete structure long term monitoring such as Longspan Bridge, water conservancy dykes and dams, high-rise building and the main direction of strain transducer development.
Cement based intelligent compound substance strain transducer is in xoncrete structure health detection process at present, the sensor resistance rate that strain causes changes and the stack of the change in resistance that temperature sensitive effect causes coupling, be still and cause the main cause that cement based intelligent compound substance strain transducer Stability of Resistivity is poor, the strain testing precision is not high, having a strong impact on the application and development of cement based intelligent compound substance strain transducer.Adopt the method for temperature compensation, output resistance rate to sensor when the xoncrete structure health monitoring compensates, avoid the fluctuation of sensor resistance rate and the strain-resistivity linear dependence that cause due to variation of ambient temperature to reduce, improve stability and the strain monitoring precision of sensor under various environment, become one of key content of current cement based intelligent compound substance strain transducer application technical research.
The Chinese patent of document 1 " patent No. is ZL 03128010.2 " and document 2 " patent No. is ZL 03254119.8 " discloses a kind of high-sensitivity carbon fibre cement based resistance-strain sensor-based system containing temperature compensation.This system is the sandwich construction that the carbon fibre cement base intelligent composite forms in the beams of concrete upper and lower surface, when it utilizes variation of ambient temperature, beams of concrete upper and lower surface intelligent composite layer resistivity changes identical phenomenon, by differential circuit, design, realized the temperature compensation of this strain sensing system output resistance rate, eliminated the impact of environment temperature, improve the strain sensitive stability of carbon fibre cement base resistance-strain sensor-based system, and there is high strain-resistance susceptibility.But the composition structure of this strain sensing system and installation technics are very complicated, and the flexural deformation monitoring of beams of concrete be can only be applicable to, application and the popularization of this cement based intelligent compound substance strain sensing system limited.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the object of the present invention is to provide a kind of cement based intelligent compound substance strain transducer with temperature compensation function, there is temperature compensation function, sensitivity coefficient is high, the pressure-sensitive character linearity is high, stability good, is applicable to the xoncrete structure strain monitoring under various environmental baselines.
To achieve these goals, the technical solution used in the present invention is:
A kind of cement based intelligent compound substance strain transducer with temperature compensation function, comprise strain monitoring module 1 and temperature monitoring module 2, strain monitoring module 1 and temperature monitoring module 2 join, and described strain monitoring module 1 and temperature monitoring module 2 all are comprised of carbon fibre cement base intrinsic intelligent composite and four parallel electrodes 3 being arranged on described compound substance.
Described carbon fibre cement base intrinsic intelligent composite is mainly (0.001～0.01) by mass ratio: 1 PAN base chopped carbon fiber and portland cement form;
Perhaps,
Described carbon fibre cement base intrinsic intelligent composite is mainly (0.001～0.01) by mass ratio: 1: PAN base chopped carbon fiber, portland cement and the silica sand of (0.5～3.0) form.
Described electrode 3 is high-purity copper mesh.
The profile of strain monitoring module 1 and temperature monitoring module 2 is rectangular parallelepiped, and electrode 3 is arranged perpendicular to the rectangular parallelepiped longest edge, and left-right symmetric.
The outside surface of temperature monitoring module 2 is coated with fleximer sill 4, and it coats thickness and is greater than 3.0% of temperature monitoring module 2 longest edges.Between strain monitoring module 1 and temperature monitoring module 2, also use fleximer sill 4 to connect.
Described fleximer sill 4 is (0.05-0.1) with the ratio of the elastic modulus of temperature monitoring module 2: 1.
Described fleximer sill 4 is mainly 1 by mass ratio: (0.02～0.80): 0.01 portland cement, alkali resistance latex powder and water reducer form;
Perhaps,
Described fleximer sill 4 is mainly 1 by mass ratio: (0.02～0.80): 0.01 portland cement, polymer emulsion and water reducer form, and all the other are impurity;
Perhaps,
Described fleximer sill 4 is mainly 1 by mass ratio: (0.02～0.80): 0.01: the portland cement of (0.5～2.0), alkali resistance latex powder, water reducer and silica sand form, and all the other are impurity;
Perhaps,
Described fleximer sill 4 is mainly 1 by mass ratio: (0.02～0.80): 0.01: the portland cement of (0.5～2.0), polymer emulsion, water reducer and silica sand form, and all the other are impurity;
Wherein, polymer emulsion adopts solid content to calculate.
On each electrode 3, there is wire to draw.
Compared with prior art, the invention has the beneficial effects as follows:
1) the present invention has the cement based intelligent compound substance strain transducer of temperature compensation function, mainly by strain monitoring module and temperature monitoring module two parts, formed, there is temperature compensation function, sensitivity coefficient is high, the pressure-sensitive character linearity is high, stability good, is applicable to the xoncrete structure strain monitoring under various environmental baselines.
2) the intelligent composite resistivity fluctuation that temperature monitoring module of the present invention causes for measuring xoncrete structure strain monitoring position temperature variation, and the output resistance rate during to the health monitoring of strain monitoring modular compensates, avoid the fluctuation of sensor resistance rate and the strain-resistivity linear dependence that cause due to variation of ambient temperature to reduce, improved stability and the strain monitoring precision of sensor under various environment.
3) temperature monitoring module of the present invention is for measuring the resistivity fluctuation of the carbon fibre cement base intrinsic intelligent composite that temperature variation causes, avoid thermopair directly to measure the bad shortcoming of technique effect that temperature is carried out temperature compensation, there is the temperature compensation precision high, the simple characteristics of technology.
4) the temperature monitoring module outside surface of sensor of the present invention is coated with the fleximer sill, avoid the fluctuation of the temperature monitoring module resistivity that stress causes under xoncrete structure embedding condition, improved effect temperature compensation and the strain monitoring precision of sensor under various strained conditions.
The accompanying drawing explanation
Fig. 1 is cement based intelligent compound substance strain transducer (rectangular parallelepiped profile) structural representation that the present invention has temperature compensation function, and the arrow indication is for changing direction.
Fig. 2 is the A-A sectional view of Fig. 1.
Fig. 3 is the B-B sectional view of Fig. 1.
Fig. 4 is the C-C sectional view of Fig. 1.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further details.
Referring to figs. 1 through Fig. 4, a kind of cement based intelligent compound substance strain transducer with temperature compensation function, comprise strain monitoring module 1 and temperature monitoring module 2, described strain monitoring module 1 and temperature monitoring module 2 all are comprised of carbon fibre cement base intrinsic intelligent composite and four parallel electrodes 3 being arranged on described compound substance, strain monitoring module 1 with temperature monitoring module 2, join and separately above all be provided with four parallel electrodes 3, electrode 3 is high-purity copper mesh, on each electrode 3, there is wire to draw, the profile of strain monitoring module 1 and temperature monitoring module 2 is rectangular parallelepiped, electrode 3 is arranged perpendicular to the rectangular parallelepiped longest edge, and left-right symmetric.
Wherein, PAN base chopped carbon fiber and portland cement that carbon fibre cement base intrinsic intelligent composite is mainly 0.001: 1 by mass ratio form, the drying dispersing technology obtains the carbon-fiber cement mixture, and, with together with copper net electrode is cast in, solidify to form strain monitoring module 1 and the temperature monitoring module 2 of sensor.The outside surface of temperature monitoring module 2 is coated with fleximer sill 4, and is connected with strain monitoring module 1 by fleximer sill 4.The portland cement that fleximer sill 4 is mainly 1: 0.02: 0.01 by mass ratio, alkali resistance latex powder and water reducer form, and its elastic modulus is temperature monitoring module 10.0%.
There is in the cement based intelligent compound substance strain transducer of temperature compensation function the input quantity that is sensor perpendicular to the strain of 1 four mesh electrode 3 directions of strain monitoring module; Applying DC voltage between two plate electrodes in the outside separately at strain monitoring module 1 and temperature monitoring module 2, inboard two plate electrodes detect respectively the output quantity that the change in voltage that obtains is sensor.
In the sensor use procedure, utilize current value and sensor geometric parameter, the change in voltage that inboard two plate electrodes of strain monitoring module 1 are detected is scaled the change in resistance Δ R1 of strain monitoring module 1; Recycling current value and sensor geometric parameter, the change in voltage that inboard two plate electrodes of temperature monitoring module 2 are detected is scaled the change in resistance Δ R2 of temperature monitoring module 2.Then after can obtaining temperature compensation, the change in resistance Δ R=Δ R1-Δ R2 of strain monitoring module, i.e. the sensor resistance rate that xoncrete structure strain causes changes.Finally the cement based intelligent compound substance strain transducer set up of contrast and relation curve or the relational expression between change in resistance, realize the strain monitoring of xoncrete structure under various environment temperatures.
Referring to figs. 1 through Fig. 4, a kind of cement based intelligent compound substance strain transducer with temperature compensation function, comprise strain monitoring module 1 and temperature monitoring module 2, described strain monitoring module 1 and temperature monitoring module 2 all are comprised of carbon fibre cement base intrinsic intelligent composite and four parallel electrodes 3 being arranged on described compound substance, strain monitoring module 1 with temperature monitoring module 2, join and separately above all be provided with four parallel electrodes 3, electrode 3 is high-purity copper mesh, on each electrode 3, there is wire to draw, the profile of strain monitoring module 1 and temperature monitoring module 2 is rectangular parallelepiped, electrode 3 is arranged perpendicular to the rectangular parallelepiped longest edge, and left-right symmetric.
Wherein, PAN base chopped carbon fiber, portland cement and silica sand that carbon fibre cement base intrinsic intelligent composite is mainly 0.004: 1: 0.5 by mass ratio form, the drying dispersing technology obtains the carbon-fiber cement mixture, and, with together with copper net electrode is cast in, solidify to form strain monitoring module 1 and the temperature monitoring module 2 of sensor.The outside surface of temperature monitoring module 2 is coated with fleximer sill 4, and is connected with strain monitoring module 1 by fleximer sill 4.The portland cement that fleximer sill 4 is mainly 1: 0.20: 0.01 by mass ratio, alkali resistance latex powder and water reducer form, and its elastic modulus is temperature monitoring module 8.0%.
There is in the cement based intelligent compound substance strain transducer of temperature compensation function the input quantity that is sensor perpendicular to the strain of 1 four mesh electrode 3 directions of strain monitoring module; Applying DC voltage between two plate electrodes in the outside separately at strain monitoring module 1 and temperature monitoring module 2, inboard two plate electrodes detect respectively the output quantity that the change in voltage that obtains is sensor.
In the sensor use procedure, utilize current value and sensor geometric parameter, the change in voltage that inboard two plate electrodes of strain monitoring module 1 are detected is scaled the change in resistance Δ R1 of strain monitoring module 1; Recycling current value and sensor geometric parameter, the change in voltage that inboard two plate electrodes of temperature monitoring module 2 are detected is scaled the change in resistance Δ R2 of temperature monitoring module 2.Then after can obtaining temperature compensation, the change in resistance Δ R=Δ R1-Δ R2 of strain monitoring module, i.e. the sensor resistance rate that xoncrete structure strain causes changes.Finally the cement based intelligent compound substance strain transducer set up of contrast and relation curve or the relational expression between change in resistance, realize the strain monitoring of xoncrete structure under various environment temperatures.
Referring to figs. 1 through Fig. 4, a kind of cement based intelligent compound substance strain transducer with temperature compensation function, comprise strain monitoring module 1 and temperature monitoring module 2, described strain monitoring module 1 and temperature monitoring module 2 all are comprised of carbon fibre cement base intrinsic intelligent composite and four parallel electrodes 3 being arranged on described compound substance, strain monitoring module 1 with temperature monitoring module 2, join and separately above all be provided with four parallel electrodes 3, electrode 3 is high-purity copper mesh, on each electrode 3, there is wire to draw, the profile of strain monitoring module 1 and temperature monitoring module 2 is rectangular parallelepiped, electrode 3 is arranged perpendicular to the rectangular parallelepiped longest edge, and left-right symmetric.
Wherein, PAN base chopped carbon fiber and portland cement that carbon fibre cement base intrinsic intelligent composite is mainly 0.006: 1 by mass ratio form, the drying dispersing technology obtains the carbon-fiber cement mixture, and, with together with copper net electrode is cast in, solidify to form strain monitoring module 1 and the temperature monitoring module 2 of sensor.The outside surface of temperature monitoring module 2 is coated with fleximer sill 4, and is connected with strain monitoring module 1 by fleximer sill 4.Fleximer sill 4 is mainly 1: 0.40: 0.01 by mass ratio: 2.0 portland cement, polymer emulsion (adopting solid content to calculate), water reducer and silica sand form, and its elastic modulus is temperature monitoring module 7.0%.
There is in the cement based intelligent compound substance strain transducer of temperature compensation function the input quantity that is sensor perpendicular to the strain of 1 four mesh electrode 3 directions of strain monitoring module; Applying DC voltage between two plate electrodes in the outside separately at strain monitoring module 1 and temperature monitoring module 2, inboard two plate electrodes detect respectively the output quantity that the change in voltage that obtains is sensor.
In the sensor use procedure, utilize current value and sensor geometric parameter, the change in voltage that inboard two plate electrodes of strain monitoring module 1 are detected is scaled the change in resistance Δ R1 of strain monitoring module 1; Recycling current value and sensor geometric parameter, the change in voltage that inboard two plate electrodes of temperature monitoring module 2 are detected is scaled the change in resistance Δ R2 of temperature monitoring module 2.Then after can obtaining temperature compensation, the change in resistance Δ R=Δ R1-Δ R2 of strain monitoring module, i.e. the sensor resistance rate that xoncrete structure strain causes changes.Finally the cement based intelligent compound substance strain transducer set up of contrast and relation curve or the relational expression between change in resistance, realize the strain monitoring of xoncrete structure under various environment temperatures.
Referring to figs. 1 through Fig. 4, a kind of cement based intelligent compound substance strain transducer with temperature compensation function, comprise strain monitoring module 1 and temperature monitoring module 2, described strain monitoring module 1 and temperature monitoring module 2 all are comprised of carbon fibre cement base intrinsic intelligent composite and four parallel electrodes 3 being arranged on described compound substance, strain monitoring module 1 with temperature monitoring module 2, join and separately above all be provided with four parallel electrodes 3, electrode 3 is high-purity copper mesh, on each electrode 3, there is wire to draw, the profile of strain monitoring module 1 and temperature monitoring module 2 is rectangular parallelepiped, electrode 3 is arranged perpendicular to the rectangular parallelepiped longest edge, and left-right symmetric.
Wherein, PAN base chopped carbon fiber, portland cement and silica sand that carbon fibre cement base intrinsic intelligent composite is mainly 0.01: 1: 3.0 by mass ratio form, the drying dispersing technology obtains the carbon-fiber cement mixture, and, with together with copper net electrode is cast in, solidify to form strain monitoring module 1 and the temperature monitoring module 2 of sensor.The outside surface of temperature monitoring module 2 is coated with fleximer sill 4, and is connected with strain monitoring module 1 by fleximer sill 4.Fleximer sill 4 is mainly 1: 0.80: 0.01 by mass ratio: 0.5 portland cement, polymer emulsion (adopting solid content to calculate), water reducer and silica sand form, and its elastic modulus is temperature monitoring module 5.0%.
There is in the cement based intelligent compound substance strain transducer of temperature compensation function the input quantity that is sensor perpendicular to the strain of 1 four mesh electrode 3 directions of strain monitoring module; Applying DC voltage between two plate electrodes in the outside separately at strain monitoring module 1 and temperature monitoring module 2, inboard two plate electrodes detect respectively the output quantity that the change in voltage that obtains is sensor.
In the sensor use procedure, utilize current value and sensor geometric parameter, the change in voltage that inboard two plate electrodes of strain monitoring module 1 are detected is scaled the change in resistance Δ R1 of strain monitoring module 1; Recycling current value and sensor geometric parameter, the change in voltage that inboard two plate electrodes of temperature monitoring module 2 are detected is scaled the change in resistance Δ R2 of temperature monitoring module 2.Then after can obtaining temperature compensation, the change in resistance Δ R=Δ R1-Δ R2 of strain monitoring module, i.e. the sensor resistance rate that xoncrete structure strain causes changes.Finally the cement based intelligent compound substance strain transducer set up of contrast and relation curve or the relational expression between change in resistance, realize the strain monitoring of xoncrete structure under various environment temperatures.
The foregoing is only one embodiment of the present invention, it not whole or unique embodiment, the conversion of any equivalence that those of ordinary skills take technical solution of the present invention by reading instructions of the present invention, be claim of the present invention and contain.
Claims (7)
1. the cement based intelligent compound substance strain transducer with temperature compensation function, it is characterized in that, comprise strain monitoring module (1) and temperature monitoring module (2), strain monitoring module (1) and temperature monitoring module (2) join, described strain monitoring module (1) and temperature monitoring module (2) all are comprised of carbon fibre cement base intrinsic intelligent composite and four parallel electrodes (3) of being arranged on described compound substance, the profile of described strain monitoring module (1) and temperature monitoring module (2) is rectangular parallelepiped, electrode (3) is arranged perpendicular to the rectangular parallelepiped longest edge, and left-right symmetric, the outside surface of described temperature monitoring module (2) is coated with fleximer sill (4), and it coats thickness and is greater than 3.0% of temperature monitoring module (2) longest edge.
2. the cement based intelligent compound substance strain transducer with temperature compensation function according to claim 1, is characterized in that,
Described carbon fibre cement base intrinsic intelligent composite is mainly (0.001～0.01) by mass ratio: 1 PAN base chopped carbon fiber and portland cement form;
Perhaps,
Described carbon fibre cement base intrinsic intelligent composite is mainly (0.001～0.01): 1:(0.5～3.0 by mass ratio) PAN base chopped carbon fiber, portland cement and silica sand form.
3. the cement based intelligent compound substance strain transducer with temperature compensation function according to claim 1, is characterized in that, described electrode (3) is high-purity copper mesh.
4. the cement based intelligent compound substance strain transducer with temperature compensation function according to claim 1, is characterized in that, described fleximer sill (4) is (0.05-0.1) with the ratio of the elastic modulus of temperature monitoring module (2): 1.
5. the cement based intelligent compound substance strain transducer with temperature compensation function according to claim 1, is characterized in that, between described strain monitoring module (1) and temperature monitoring module (2), uses fleximer sill (4) to connect.
6. the cement based intelligent compound substance strain transducer with temperature compensation function according to claim 1, is characterized in that,
Described fleximer sill (4) is mainly 1:(0.02～0.80 by mass ratio): 0.01 portland cement, alkali resistance latex powder and water reducer form;
Perhaps,
Described fleximer sill (4) is mainly 1:(0.02～0.80 by mass ratio): 0.01 portland cement, polymer emulsion and water reducer form;
Perhaps,
Described fleximer sill (4) is mainly 1:(0.02～0.80 by mass ratio): portland cement 0.01:(0.5～2.0), alkali resistance latex powder, water reducer and silica sand form;
Perhaps
Described fleximer sill (4) is mainly 1:(0.02～0.80 by mass ratio): portland cement 0.01:(0.5～2.0), polymer emulsion, water reducer and silica sand form;
Wherein, polymer emulsion adopts solid content to calculate.
7. the cement based intelligent compound substance strain transducer with temperature compensation function according to claim 1, is characterized in that, each electrode has wire to draw on (3).
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| CN103453833B (en) * | 2013-09-03 | 2015-12-16 | 东南大学 | A kind of long gauge-length carbon fiber strain sensing devices and method of testing thereof |
| CN108645332A (en) * | 2018-05-12 | 2018-10-12 | 哈尔滨工业大学 | A kind of cement base erosive wear sensor with temperature, humidity self-compensating function |
| CN109883315B (en) * | 2019-03-22 | 2021-01-01 | 中国科学院力学研究所 | Double-sided resistance type strain sensor and strain measurement method |
| CN111855558B (en) * | 2020-07-29 | 2023-04-18 | 深圳前海中瑞智能技术开发有限公司 | System and method for eliminating characteristic adsorption of cement-based sensor |
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| CN101509757A (en) * | 2009-01-17 | 2009-08-19 | 大连理工大学 | Carbon fibre conducting cement-based composite material engineering strain measuring system |
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