CN102506691A - 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 used for the strain monitoring of xoncrete structure.
Background technology
At present in the civil engineering structure; Widely-used resistance strain gage is monitored the strain of xoncrete structure; Ripe, the reliable and stable advantage that possesses skills, but the foil gauge sensitivity coefficient is merely 2-3, and permanance is very poor; And mounting process is complicated, cost is higher, can't satisfy the technical need to the life-cycle long term monitoring of important civil engineering structure to people.And cement based intelligent compound substance strain transducer has the sensitivity coefficient height; Fabulous permanance; Advantage with low cost; And installation technics and data acquisition are simple, are the important means of 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 cement based intelligent compound substance strain transducer resistivity poor stability, main cause that the strain testing precision is not high, having a strong impact on the application and the development of cement based intelligent compound substance strain transducer.Adopt the method for temperature compensation; The output resistance rate of sensor when the xoncrete structure health monitoring compensated; Avoid because the fluctuation of sensor resistance rate and strain-resistivity linear dependence that variation of ambient temperature causes 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-fiber cement base resistance-strain sensor-based system that contains temperature compensation.This system is the sandwich construction that carbon-fiber cement base intelligent composite is formed at the beams of concrete upper and lower surfaces; Beams of concrete upper and lower surfaces intelligent composite layer resistivity changed identical phenomenon when it utilized variation of ambient temperature; Through the differential circuit design, realized the temperature compensation of this strain sensing system output resistance rate, eliminated the influence of environment temperature; Improve the strain sensitive stability of carbon-fiber cement base resistance-strain sensor-based system, and had high strain-resistance susceptibility.But the composition structure of this strain sensing system and installation technics are very complicated, and can only be applicable to the flexural deformation monitoring of beams of concrete, have limited the application and the popularization of this cement based intelligent compound substance strain sensing system.
Summary of the invention
In order to overcome the deficiency of above-mentioned 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; Has temperature compensation function; Sensitivity coefficient is high, the pressure-sensitive character linearity is high, stability is good, is applicable to the xoncrete structure strain monitoring under the various environmental baselines.
To achieve these goals, the technical scheme of the present invention's employing 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 is joined with temperature monitoring module 2, and said strain monitoring module 1 is all levied intelligent composite by carbon-fiber cement basically with temperature monitoring module 2 and four parallel electrodes 3 being arranged on the said compound substance are formed.
Said carbon-fiber cement is levied intelligent composite basically and mainly is (0.001～0.01) by mass ratio: 1 PAN base chopped carbon fiber and portland cement are formed;
Perhaps,
Said carbon-fiber cement is levied intelligent composite basically and mainly is (0.001～0.01) by mass ratio: 1: PAN base chopped carbon fiber, portland cement and the silica sand of (0.5～3.0) are formed.
Said 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 greater than 3.0% of temperature monitoring module 2 longest edges.Also use fleximer sill 4 to connect between strain monitoring module 1 and the temperature monitoring module 2.
Said fleximer sill 4 is (0.05-0.1) with the ratio of the elastic modulus of temperature monitoring module 2: 1.
Said fleximer sill 4 is 1 by mass ratio mainly: (0.02～0.80): 0.01 portland cement, alkali resistance latex powder and water reducer are formed;
Perhaps,
Said fleximer sill 4 is 1 by mass ratio mainly: (0.02～0.80): 0.01 portland cement, polymer emulsion and water reducer are formed, and all the other are impurity;
Perhaps,
Said fleximer sill 4 is 1 by mass ratio mainly: (0.02～0.80): 0.01: the portland cement of (0.5～2.0), alkali resistance latex powder, water reducer and silica sand are formed, and all the other are impurity;
Perhaps,
Said fleximer sill 4 is 1 by mass ratio mainly: (0.02～0.80): 0.01: the portland cement of (0.5～2.0), polymer emulsion, water reducer and silica sand are formed, and all the other are impurity;
Wherein, polymer emulsion adopts solid content to calculate.
All there is lead to draw on each electrode 3.
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 constitute by strain monitoring module and temperature monitoring module two parts; Has temperature compensation function; Sensitivity coefficient is high, the pressure-sensitive character linearity is high, stability is good, is applicable to the xoncrete structure strain monitoring under the various environmental baselines.
2) temperature monitoring module of the present invention is used to measure the intelligent composite resistivity fluctuation that xoncrete structure strain monitoring position temperature variation causes; And the output resistance rate during to the health monitoring of strain monitoring modular compensates; Avoid having improved stability and the strain monitoring precision of sensor under various environment because the fluctuation of sensor resistance rate and strain-resistivity linear dependence that variation of ambient temperature causes reduce.
3) temperature monitoring module of the present invention is used to measure the resistivity fluctuation that carbon-fiber cement that temperature variation causes is levied intelligent composite basically; Avoid thermopair directly to measure the bad shortcoming of technique effect that temperature is carried out temperature compensation; It is high to have the temperature compensation precision, technological characteristic of simple.
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.
Description of drawings
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 accompanying drawing and embodiment the present invention is explained further details.
Referring to figs. 1 through Fig. 4; A kind of cement based intelligent compound substance strain transducer with temperature compensation function comprises strain monitoring module 1 and temperature monitoring module 2, and said strain monitoring module 1 is all levied intelligent composite by carbon-fiber cement basically with temperature monitoring module 2 and four parallel electrodes 3 being arranged on the said compound substance are formed; Strain monitoring module 1 join with temperature monitoring module 2 and separately above all be provided with four parallel electrodes 3; Electrode 3 is high-purity copper mesh, all has lead to draw on each electrode 3, and 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, It is that 0.001: 1 PAN base chopped carbon fiber and portland cement formed by mass ratio mainly that carbon-fiber cement is levied intelligent composite basically; Obtain the carbon-fiber cement mixture through dry dispersing technology; And be cast in copper net electrode, solidify to form the strain monitoring module 1 and 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 through fleximer sill 4.Fleximer sill 4 is that 1: 0.02: 0.01 portland cement, alkali resistance latex powder and water reducer formed by mass ratio mainly, and its elastic modulus is 10.0% of a temperature monitoring module.
Having in the cement based intelligent compound substance strain transducer of temperature compensation function, is the input quantity of 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 in strain monitoring module 1 and temperature monitoring module 2, it is the output quantity of sensor that then inboard two plate electrodes detect the change in voltage that obtains respectively.
In the sensor use, utilize current value and sensor geometric parameter, the detected change in voltage of strain monitoring module 1 inboard two plate electrodes is scaled the change in resistance Δ R1 of strain monitoring module 1; Utilize current value and sensor geometric parameter again, the detected change in voltage of temperature monitoring module 2 inboard two plate electrodes is scaled the change in resistance Δ R2 of temperature monitoring module 2.After can obtaining temperature compensation then, 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.The cement based intelligent compound substance strain transducer set up of contrast and relation curve or the relational expression between the change in resistance at last realize the strain monitoring of xoncrete structure under the various environment temperatures.
Referring to figs. 1 through Fig. 4; A kind of cement based intelligent compound substance strain transducer with temperature compensation function comprises strain monitoring module 1 and temperature monitoring module 2, and said strain monitoring module 1 is all levied intelligent composite by carbon-fiber cement basically with temperature monitoring module 2 and four parallel electrodes 3 being arranged on the said compound substance are formed; Strain monitoring module 1 join with temperature monitoring module 2 and separately above all be provided with four parallel electrodes 3; Electrode 3 is high-purity copper mesh, all has lead to draw on each electrode 3, and 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, It is that 0.004: 1: 0.5 PAN base chopped carbon fiber, portland cement and silica sand is formed by mass ratio mainly that carbon-fiber cement is levied intelligent composite basically; Obtain the carbon-fiber cement mixture through dry dispersing technology; And be cast in copper net electrode, solidify to form the strain monitoring module 1 and 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 through fleximer sill 4.Fleximer sill 4 is that 1: 0.20: 0.01 portland cement, alkali resistance latex powder and water reducer formed by mass ratio mainly, and its elastic modulus is 8.0% of a temperature monitoring module.
Having in the cement based intelligent compound substance strain transducer of temperature compensation function, is the input quantity of 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 in strain monitoring module 1 and temperature monitoring module 2, it is the output quantity of sensor that then inboard two plate electrodes detect the change in voltage that obtains respectively.
In the sensor use, utilize current value and sensor geometric parameter, the detected change in voltage of strain monitoring module 1 inboard two plate electrodes is scaled the change in resistance Δ R1 of strain monitoring module 1; Utilize current value and sensor geometric parameter again, the detected change in voltage of temperature monitoring module 2 inboard two plate electrodes is scaled the change in resistance Δ R2 of temperature monitoring module 2.After can obtaining temperature compensation then, 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.The cement based intelligent compound substance strain transducer set up of contrast and relation curve or the relational expression between the change in resistance at last realize the strain monitoring of xoncrete structure under the various environment temperatures.
Referring to figs. 1 through Fig. 4; A kind of cement based intelligent compound substance strain transducer with temperature compensation function comprises strain monitoring module 1 and temperature monitoring module 2, and said strain monitoring module 1 is all levied intelligent composite by carbon-fiber cement basically with temperature monitoring module 2 and four parallel electrodes 3 being arranged on the said compound substance are formed; Strain monitoring module 1 join with temperature monitoring module 2 and separately above all be provided with four parallel electrodes 3; Electrode 3 is high-purity copper mesh, all has lead to draw on each electrode 3, and 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, It is that 0.006: 1 PAN base chopped carbon fiber and portland cement formed by mass ratio mainly that carbon-fiber cement is levied intelligent composite basically; Obtain the carbon-fiber cement mixture through dry dispersing technology; And be cast in copper net electrode, solidify to form the strain monitoring module 1 and 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 through fleximer sill 4.Fleximer sill 4 is 1: 0.40: 0.01 by mass ratio mainly: 2.0 portland cement, polymer emulsion (adopting solid content to calculate), water reducer and silica sand are formed, and its elastic modulus is 7.0% of a temperature monitoring module.
Having in the cement based intelligent compound substance strain transducer of temperature compensation function, is the input quantity of 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 in strain monitoring module 1 and temperature monitoring module 2, it is the output quantity of sensor that then inboard two plate electrodes detect the change in voltage that obtains respectively.
In the sensor use, utilize current value and sensor geometric parameter, the detected change in voltage of strain monitoring module 1 inboard two plate electrodes is scaled the change in resistance Δ R1 of strain monitoring module 1; Utilize current value and sensor geometric parameter again, the detected change in voltage of temperature monitoring module 2 inboard two plate electrodes is scaled the change in resistance Δ R2 of temperature monitoring module 2.After can obtaining temperature compensation then, 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.The cement based intelligent compound substance strain transducer set up of contrast and relation curve or the relational expression between the change in resistance at last realize the strain monitoring of xoncrete structure under the various environment temperatures.
Referring to figs. 1 through Fig. 4; A kind of cement based intelligent compound substance strain transducer with temperature compensation function comprises strain monitoring module 1 and temperature monitoring module 2, and said strain monitoring module 1 is all levied intelligent composite by carbon-fiber cement basically with temperature monitoring module 2 and four parallel electrodes 3 being arranged on the said compound substance are formed; Strain monitoring module 1 join with temperature monitoring module 2 and separately above all be provided with four parallel electrodes 3; Electrode 3 is high-purity copper mesh, all has lead to draw on each electrode 3, and 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, It is that 0.01: 1: 3.0 PAN base chopped carbon fiber, portland cement and silica sand is formed by mass ratio mainly that carbon-fiber cement is levied intelligent composite basically; Obtain the carbon-fiber cement mixture through dry dispersing technology; And be cast in copper net electrode, solidify to form the strain monitoring module 1 and 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 through fleximer sill 4.Fleximer sill 4 is 1: 0.80: 0.01 by mass ratio mainly: 0.5 portland cement, polymer emulsion (adopting solid content to calculate), water reducer and silica sand are formed, and its elastic modulus is 5.0% of a temperature monitoring module.
Having in the cement based intelligent compound substance strain transducer of temperature compensation function, is the input quantity of 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 in strain monitoring module 1 and temperature monitoring module 2, it is the output quantity of sensor that then inboard two plate electrodes detect the change in voltage that obtains respectively.
In the sensor use, utilize current value and sensor geometric parameter, the detected change in voltage of strain monitoring module 1 inboard two plate electrodes is scaled the change in resistance Δ R1 of strain monitoring module 1; Utilize current value and sensor geometric parameter again, the detected change in voltage of temperature monitoring module 2 inboard two plate electrodes is scaled the change in resistance Δ R2 of temperature monitoring module 2.After can obtaining temperature compensation then, 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.The cement based intelligent compound substance strain transducer set up of contrast and relation curve or the relational expression between the change in resistance at last realize the strain monitoring of xoncrete structure under the various environment temperatures.
The above is merely one embodiment of the present invention; It or not whole or unique embodiment; The conversion of any equivalence that those of ordinary skills take technical scheme of the present invention through reading instructions of the present invention is claim of the present invention and contains.
Claims (9)
1. 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) are joined, and said strain monitoring module (1) is all levied intelligent composite by carbon-fiber cement basically with temperature monitoring module (2) and four parallel electrodes (3) of being arranged on the said compound substance are formed.
2. the cement based intelligent compound substance strain transducer with temperature compensation function according to claim 1 is characterized in that,
Said carbon-fiber cement is levied intelligent composite basically and mainly is (0.001～0.01) by mass ratio: 1 PAN base chopped carbon fiber and portland cement are formed;
Perhaps,
Said carbon-fiber cement is levied intelligent composite basically and mainly is (0.001～0.01) by mass ratio: 1: PAN base chopped carbon fiber, portland cement and the silica sand of (0.5～3.0) are formed.
3. the cement based intelligent compound substance strain transducer with temperature compensation function according to claim 1 is characterized in that said electrode (3) is high-purity copper mesh.
4. the cement based intelligent compound substance strain transducer with temperature compensation function according to claim 1; It is characterized in that; The profile of said 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.
5. the cement based intelligent compound substance strain transducer with temperature compensation function according to claim 1; It is characterized in that; The outside surface of said temperature monitoring module (2) is coated with fleximer sill (4), and it coats thickness greater than 3.0% of temperature monitoring module (2) longest edge.
6. the cement based intelligent compound substance strain transducer with temperature compensation function according to claim 5 is characterized in that, said fleximer sill (4) is (0.05-0.1) with the ratio of the elastic modulus of temperature monitoring module (2): 1.
7. the cement based intelligent compound substance strain transducer with temperature compensation function according to claim 1 is characterized in that, uses fleximer sill (4) to connect between said strain monitoring module (1) and the temperature monitoring module (2).
8. according to the described cement based intelligent compound substance strain transducer of the arbitrary claim of claim 5 to 7, it is characterized in that with temperature compensation function,
Said fleximer sill (4) is 1 by mass ratio mainly: (0.02～0.80): 0.01 portland cement, alkali resistance latex powder and water reducer are formed;
Perhaps,
Said fleximer sill (4) is 1 by mass ratio mainly: (0.02～0.80): 0.01 portland cement, polymer emulsion and water reducer are formed;
Perhaps,
Said fleximer sill (4) is 1 by mass ratio mainly: (0.02～0.80): 0.01: the portland cement of (0.5～2.0), alkali resistance latex powder, water reducer and silica sand are formed;
Perhaps
Said fleximer sill (4) is 1 by mass ratio mainly: (0.02～0.80): 0.01: the portland cement of (0.5～2.0), polymer emulsion, water reducer and silica sand are formed;
Wherein, polymer emulsion adopts solid content to calculate.
9. the cement based intelligent compound substance strain transducer with temperature compensation function according to claim 1 is characterized in that all having lead to draw on each electrode (3).
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| 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 |
| CN111855558A (en) * | 2020-07-29 | 2020-10-30 | 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 |
| 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 |
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