CN108872319A - A kind of corrosion sensor - Google Patents
A kind of corrosion sensor Download PDFInfo
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- CN108872319A CN108872319A CN201810257432.9A CN201810257432A CN108872319A CN 108872319 A CN108872319 A CN 108872319A CN 201810257432 A CN201810257432 A CN 201810257432A CN 108872319 A CN108872319 A CN 108872319A
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/041—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body
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Abstract
The present invention discloses a kind of corrosion sensor, including：Piezoelectric ceramic piece, iron plate, the first filled layer, the second filled layer, shell and shielded wire；The bottom surface of piezoelectric ceramic piece is pasted on the top surface of iron plate, and the top surface of piezoelectric ceramic piece and side coating epoxy resin form protective layer；By pasting and protecting treated piezoelectric ceramic piece and iron plate to be set in shell, it is provided with the first filled layer between piezoelectric ceramic piece and shell, the second filled layer is provided between iron plate and shell；The top and bottom of shell are provided with multiple through-holes, and the side of shell is provided with outlet hole；Shielded wire one end connects piezoelectric ceramic piece, and the other end is drawn by outlet hole.The accuracy that other factors improve measurement to the influence of electromechanical impedance can be excluded by carrying out corrosion monitoring to anchoring system using corrosion sensor of the invention.
Description
Technical field
The present invention relates to technical field of civil engineering, more particularly to a kind of corrosion sensor.
Background technique
Anchoring system is widely used among the civil engineering structures such as tunnel, side slope, prestressed concrete, cable bridge.
Steel strand wires, reinforcing bar, anchor pole etc. are the bearing carriers of anchoring system most critical most fragile.High stress, Complicated Loads, rainwater and
Under the collective effect of environmental corrosion medium, anchoring system inevitably occurs to corrode disease, seriously threatens the durable of structure
Property and safe military service performance.Therefore, the corrosion monitoring research of anchoring system is increasingly valued by people.Existing is directed to anchor
Solid system corrosion monitoring method is mostly visual detection, ultrasonic test method and optical fiber sensing technology.Visual probe method needs are torn open
Anchoring system is unloaded, structural intergrity is destroyed, needs to spend a large amount of manpower and material resources.Ultrasonic test method is difficult to quantitative corroded
Degree be easy to cause monitoring to make mistakes.Optical fiber sensing technology is very high due to requiring technique, and cost is high, and relevant monitoring is theoretical
The disadvantages of immature, greatly hinders its engineer application.
Electromechanical resistance technique is a kind of emerging structure health monitoring method, very sensitive to structure partial micro-damage.Machine
Electrical impedance technology is by carrying out frequency sweep to piezoelectric material using impedance analyzer and swashing in measured structure surface mount piezoelectric material
It encourages, measurement obtains electromechanical impedance.By comparing the electromechanical impedance of faulted condition and serviceable condition, the healthy shape of measured structure is learnt
Condition.Monitoring structural health conditions based on electromechanical impedance gradually receive the concern of people in recent years, also slightly report in terms of corrosion monitoring
Road.Patent CN103575769A is by pasting piezoelectric transducer, the variation of measuring machine electrical impedance, to reach monitoring coagulation in reinforcing bar
Native steel bar corrosion.Patent CN105548271A is realized by being sticked piezoceramics film in bridge cable outer wall or end face to drawing
The monitoring of rope corrosion situation.
Following problems are can be found that according to current research situation and Patent：(1) piezoelectric material is only simply pasted onto
Measured structure surface fails to exclude influence of the other factors to electromechanical impedance, and measurement accuracy has much room for improvement；(2) measured structure
Usual complex shape, it is complicated so as to cause electromechanical impedance and structural mechanical impedance relationship, it is difficult to establish effective theoretical prediction mould
Type；(3) measurement result is mostly qualitative index, still lacks the quantitative expression of faulted condition.
Summary of the invention
The object of the present invention is to provide a kind of corrosion sensors based on electromechanical impedance, can exclude other factors to electromechanics
The influence of impedance is to improve the accuracy of measurement.
To achieve the above object, the present invention provides following schemes：
A kind of corrosion sensor, including：Piezoelectric ceramic piece, iron plate, the first filled layer, the second filled layer, shell and shielding
Conducting wire；The bottom surface of the piezoelectric ceramic piece is pasted on the top surface of the iron plate, the top surface of the piezoelectric ceramic piece and side coating
Epoxy resin forms protective layer；It is described outer by pasting and protecting treated the piezoelectric ceramic piece and the iron plate to be set to
In shell, it is provided with the first filled layer between the piezoelectric ceramic piece and the shell, is arranged between the iron plate and the shell
There is the second filled layer；The top and bottom of the shell are provided with multiple through-holes, and the side of the shell is provided with outlet hole；
Described shielded wire one end connects the piezoelectric ceramic piece, and the other end is drawn by the outlet hole.
Optionally, the shape of the piezoelectric ceramic piece is cylinder.
Optionally, the shape of the iron plate is cylinder；The piezoelectric ceramic piece is completely covered in the top surface of the iron plate
Bottom surface.
Optionally, first filled layer and second filled layer are sponge filled layer；The sponge filled layer is
Cylindrical sponge piece；The bottom surface of the iron plate is completely covered in the top surface of second filled layer.
Optionally, the shell includes upper housing and lower case, and the upper housing and the lower case are circular cylindrical shell
Body, material are plastics or non-corrosive metal (NCM).
Optionally, the bottom surface of the upper housing is recessed inwardly to form the first cylinder shape groove, first cylinder shape groove
Diameter it is identical as the diameter of first filled layer, the depth of first cylinder shape groove is greater than or equal to first thickness,
The first thickness is the sum of the thickness of first filled layer, the thickness of the iron plate and thickness of the piezoelectric ceramic piece；
The top surface of the lower case is recessed inwardly to form the second cylinder shape groove, the diameter of second cylinder shape groove and described second
The diameter of filled layer is identical, and the depth of second cylinder shape groove is greater than or equal to second thickness, and the second thickness is institute
State the sum of the thickness of the second filled layer, the thickness of the iron plate and thickness of the piezoelectric ceramic piece.
The specific embodiment provided according to the present invention, the invention discloses following technical effects：The invention discloses one kind
Corrosion sensor, piezoelectric ceramic piece are pasted on iron plate surface and are set in shell, due to being provided on corrosion sensor shell
Through-hole, external environment corrosive deposit invade iron plate by the through-hole being arranged on shell, corrode iron plate, cause iron plate quality
Loss and loss of rigidity, and then cause the variation of iron plate mechanical impedance, it is possible to it is electromechanical using impedance analyzer measurement iron plate
The situation of change of impedance obtains the corrosion degree information of iron plate, compared with the existing technology in simply by piezoelectric material is simple
It is pasted onto anchoring system body structure surface, measures anchoring system because of the variation of the electromechanical impedance caused by corrosion using impedance analyzer
Situation, this corrosion sensor of the invention can exclude influence of the other factors to electromechanical impedance to improve the accurate of measurement
Property；Piezoelectric ceramic piece is pasted on iron plate surface simultaneously, when measuring the impedance of iron plate electromechanics using impedance analyzer, since iron plate is letter
Single cylinder, geometry is simple, and the anchoring system structure relative to complex shape is easier to establish effective theoretical prediction
Model is to realize the corrosion Quantitative Monitoring of anchoring system.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without any creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the structure chart of corrosion sensor embodiment of the present invention；
Fig. 2 is the schematic diagram that corrosion sensor of the present invention is embedded in duct steel strand wires, anchor head anchor cover position.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The object of the present invention is to provide a kind of corrosion sensors based on electromechanical impedance, can exclude other factors to electromechanics
The influence of impedance is to improve the accuracy of measurement.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
Fig. 1 is the structure chart of corrosion sensor embodiment of the present invention.
Referring to Fig. 1, the corrosion sensor, including：Piezoelectric ceramic piece 1, iron plate 2, the first filled layer 31, the second filled layer
32, shell 4 and shielded wire 5；
The bottom surface of the piezoelectric ceramic piece 1 is pasted on the top surface of the iron plate 2, the top surface and side of the piezoelectric ceramic piece 1
Face coats epoxy resin and forms protective layer；The shape of the piezoelectric ceramic piece 1 is cylinder；The shape of the iron plate 2 is cylinder
Shape；The bottom surface of the piezoelectric ceramic piece 1 is completely covered in the top surface of the iron plate 2；The bottom surface and side of the iron plate 2 are not required to coat
Epoxy resin, for corroding.
By pasting and protecting treated the piezoelectric ceramic piece 1 and the iron plate 2 to be set in the shell 4, institute
It states and is provided with the first filled layer 31 between piezoelectric ceramic piece 1 and the shell 4, be provided between the iron plate 2 and the shell 4
Second filled layer 32；First filled layer 31 and second filled layer 32 are sponge filled layer；The sponge filled layer
For cylindrical sponge piece；The bottom surface of the iron plate 2 is completely covered in the top surface of second filled layer 32；The inside of the shell 4
There need to be enough spaces, it is described to keep the vacant state of the piezoelectric ceramic piece 1 and the iron plate 2 using sponge filled layer
Vacant state, that is, piezoelectric ceramic piece 1 and the iron plate 2 do not contact with the top and bottom of the shell 4, and the pressure
Electroceramics piece 1 and the iron plate 2 are located at the inside middle position of the shell 4；The effect of the sponge filled layer is to allow institute
State piezoelectric ceramic piece 1 and the iron plate 2 be not directly contacted with the shell 4, make the piezoelectric ceramic piece 1 and the iron plate 2 not by
The influence of external stress improves the standard of corrosion monitoring to exclude influence of the ess-strain to resulting electromechanical impedance is measured
True property.
The top and bottom of the shell 4 are provided with multiple through-holes, and the effect that multiple through-holes are arranged is to facilitate extraneous ring
Border corrosive deposit penetrates into the inside of the corrosion sensor, and invades the iron plate 2, corrodes the iron plate 2；It is described
The side of shell 4 is provided with outlet hole；The shell 4 includes upper housing and lower case, and the upper housing and the lower case are equal
For cylindrical housings, material is plastics or non-corrosive metal (NCM)；The bottom surface of the upper housing is recessed inwardly to form the first cylinder shape groove,
The diameter of first cylinder shape groove is identical as the diameter of first filled layer 31, the depth of first cylinder shape groove
More than or equal to first thickness, the first thickness is the thickness of first filled layer 31, the thickness of the iron plate 2 and described
The sum of the thickness of piezoelectric ceramic piece 1；The top surface of the lower case is recessed inwardly to form the second cylinder shape groove, second cylinder
The diameter of connected in star is identical as the diameter of second filled layer 32, and the depth of second cylinder shape groove is greater than or equal to the
Two thickness, the second thickness are the thickness and the piezoelectric ceramic piece 1 of the thickness of second filled layer 32, the iron plate 2
The sum of thickness.
One end of the shielded wire 5 connects the piezoelectric ceramic piece 1, and the other end of the shielded wire 5 passes through described
Outlet hole is drawn.
Fig. 2 is the schematic diagram that corrosion sensor of the present invention is embedded in duct steel strand wires, anchor head anchor cover position.
Referring to fig. 2, corrosion sensor 6 is embedded near the duct steel strand wires 7 of anchoring-bolt system and inside anchor head anchor lid, together
When impedance analyzer 8 connected by the shielded wire that the outlet hole of corrosion sensor 6 is drawn, implement the corrosion to anchoring-bolt system and supervise
It surveys.In actual use, the position of corrosion sensor 6 is laid according to monitoring needs, corrosion sensor 6 is when in use without position
The limitation set, its placement location will not have an impact for final measurement result.It can be surveyed before using corrosion sensor
Measure a reference value of its original state, behind all measured value can all be compared with a reference value, the electromechanics obtained by measurement of comparison
Impedance, obtains the corrosion degree information of iron plate, and then obtains the corrosion degree information of anchoring system.
Piezoelectric ceramic piece is pasted on iron plate surface and is set in shell by the present invention, while filling sponge inside the shell,
So that piezoelectric ceramic piece and iron plate is not directly contacted with shell, therefore is not influenced by external stress；Corrosion sensor is embedded in anchor
Position to be monitored in solid system, due to being provided with through-hole on shell, external environment corrosive deposit is logical by what is be arranged on shell
Iron plate is invaded in hole, is corroded iron plate, is caused iron plate mass loss and loss of rigidity, and then causes the change of iron plate mechanical impedance
Change, the variation of iron plate mechanical impedance can cause the variation of electromechanical impedance, it is possible to electromechanical using impedance analyzer measurement iron plate
The situation of change of impedance obtains the corrosion degree information of iron plate, compared with the existing technology in simply by piezoelectric material is simple
It is pasted onto anchoring system body structure surface, measures anchoring system because of the variation of the electromechanical impedance caused by corrosion using impedance analyzer
Situation, this corrosion sensor of the invention can exclude influence of the other factors to electromechanical impedance to improve the accurate of measurement
Property.
In addition, piezoelectric ceramic piece is pasted on iron plate surface, relative to the anchoring system structure of complex shape, impedance is utilized
When analyzer measures the impedance of iron plate electromechanics, since iron plate is simple cylinder, geometry is simple, using cylindrical coordinates, holds very much
Easily set up the theoretical prediction model of electromechanical impedance Yu iron plate geometric relationship, theoretical prediction model be reflect electromechanical impedance with
The model of structural mechanical impedance relationship, the variation of structural mechanical impedance can cause the variation of electromechanical impedance, if construction geometry shape
Shape is complicated, and theoretical prediction model is set up can be extremely difficult；Iron plate is because change in shape (such as thickness reduction) occurs for corrosion, all
It can be reflected in the electromechanical impedance obtained by impedance analyzer measurement, due to having been set up electromechanics in theoretical prediction model
Relationship between impedance and iron plate geometric dimension, therefore the electromechanical impedance that measurement is obtained substitutes into theoretical prediction model, can obtain
Out iron plate because caused by corrosion thickness reduction so as to the corrosion amount of quantitative expression iron plate realize the rust of anchoring system
Lose Quantitative Monitoring.
Used herein a specific example illustrates the principle and implementation of the invention, and above embodiments are said
It is bright to be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art, foundation
Thought of the invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification is not
It is interpreted as limitation of the present invention.
Claims (6)
1. a kind of corrosion sensor, which is characterized in that including：It is piezoelectric ceramic piece, iron plate, the first filled layer, the second filled layer, outer
Shell and shielded wire；The bottom surface of the piezoelectric ceramic piece is pasted on the top surface of the iron plate, the top surface of the piezoelectric ceramic piece and
Side coats epoxy resin and forms protective layer；By pasting and protecting treated the piezoelectric ceramic piece and iron plate setting
In in the shell, being provided with the first filled layer between the piezoelectric ceramic piece and the shell, the iron plate and the shell
Between be provided with the second filled layer；The top and bottom of the shell are provided with multiple through-holes, the side setting of the shell
There is outlet hole；Described shielded wire one end connects the piezoelectric ceramic piece, and the other end is drawn by the outlet hole.
2. corrosion sensor according to claim 1, which is characterized in that the shape of the piezoelectric ceramic piece is cylinder.
3. corrosion sensor according to claim 1, which is characterized in that the shape of the iron plate is cylinder；The iron
The bottom surface of the piezoelectric ceramic piece is completely covered in the top surface of piece.
4. corrosion sensor according to claim 1, which is characterized in that first filled layer and second filled layer
It is sponge filled layer；The sponge filled layer is cylindrical sponge piece；The top surface of second filled layer is completely covered described
The bottom surface of iron plate.
5. corrosion sensor according to claim 1, which is characterized in that the shell includes upper housing and lower case, institute
It states upper housing and the lower case is cylindrical housings, material is plastics or non-corrosive metal (NCM).
6. corrosion sensor according to claim 5, which is characterized in that the bottom surface of the upper housing is recessed inwardly to form
One cylinder shape groove, the diameter of first cylinder shape groove is identical as the diameter of first filled layer, first cylinder
The depth of connected in star is greater than or equal to first thickness, and the first thickness is the thickness of first filled layer, the iron plate
The sum of thickness and the thickness of the piezoelectric ceramic piece；The top surface of the lower case is recessed inwardly to form the second cylinder shape groove, institute
The diameter for stating the second cylinder shape groove is identical as the diameter of second filled layer, and the depth of second cylinder shape groove is greater than
Or it is equal to second thickness, the second thickness is the thickness of second filled layer, the thickness of the iron plate and piezoelectricity pottery
The sum of thickness of tile.
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| CN201810257432.9A CN108872319B (en) | 2018-03-27 | 2018-03-27 | Corrosion sensor |
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| CN201810257432.9A CN108872319B (en) | 2018-03-27 | 2018-03-27 | Corrosion sensor |
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| CN108872319B CN108872319B (en) | 2021-01-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111458281A (en) * | 2020-03-24 | 2020-07-28 | 哈尔滨工业大学(深圳)(哈尔滨工业大学深圳科技创新研究院) | Concrete degradation monitoring sensor and system based on piezoelectric impedance technology |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111458281A (en) * | 2020-03-24 | 2020-07-28 | 哈尔滨工业大学(深圳)(哈尔滨工业大学深圳科技创新研究院) | Concrete degradation monitoring sensor and system based on piezoelectric impedance technology |
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