CN211785310U - External steel bar corrosion nondestructive monitoring sensor based on electromagnetic field principle - Google Patents
External steel bar corrosion nondestructive monitoring sensor based on electromagnetic field principle Download PDFInfo
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Abstract
A steel bar corrosion monitoring sensor based on an electromagnetic field principle comprises a magnetic induction intensity monitoring unit and a data processing unit, wherein the magnetic induction intensity monitoring unit comprises a magnetic core, a coil, a packaging shell, a Hall sensor and a signal generator; the data processing unit comprises a signal processor and a central processing unit. The utility model overcomes the defect of traditional testing method for monitoring the corrosion of the steel bar in the concrete, eliminates the influence of the size change of the steel bar position and the bayonet on the monitoring of the corrosion of the steel bar by the symmetrical arrangement of the Hall sensors and the control of the electromagnetic field intensity, and realizes the accurate monitoring of the corrosion of the steel bar; the test piece is suitable for both mortar test pieces and concrete test pieces.
Description
Technical Field
The utility model relates to a reinforcing bar corrosion monitoring technology among the building engineering, in particular to external reinforcing bar corrosion nondestructive monitoring sensor based on electromagnetic field principle.
Background
The reinforced concrete structure combines the characteristics of tensile strength and compression strength of the reinforced steel bar, and has become the most widely applied structural form in the world due to the characteristics of low cost, wide material sources, convenience in construction and the like since the reinforced concrete structure is applied to the field of civil engineering in the middle of 19 th century. The damage caused by the failure of the durability of the concrete is huge for a long time and far exceeds the expectation of people, and the damage becomes a worldwide problem. The steel bar corrosion is the most serious in the cause of the durability damage of the concrete, and the method has attracted wide attention at home and abroad. A great deal of research is also made by the predecessors aiming at the research of the detection of the corrosion of the steel bar in the construction engineering.
At present, the monitoring method of the steel bar corrosion is divided into damage detection and nondestructive detection. The damage detection measurement result is more accurate, but need to carry out the broken type to reinforced concrete structure and take out the reinforcing bar, and the harm that causes the concrete structure is irreversible, and is not suitable for being adjusted the reinforced concrete structure in service period well. The nondestructive testing method is a hotspot of current research, and mainly comprises a half-cell potential method, an acoustic emission technology and a built-in monitoring technology. The half-cell potential method utilizes the potential change caused by the electrochemical reaction of the steel bar corrosion to determine the steel bar corrosion state, but the accuracy is lower, the probability of the steel bar corrosion can be only determined qualitatively, and no unified determination standard exists; the acoustic emission technology can only qualitatively judge the corrosion occurrence probability according to parameters such as accumulated impact number and the like, and can not quantitatively measure the corrosion rate of the steel bar; a steel bar corrosion monitoring method based on a magnetic field principle is disclosed, wherein the number of Chinese patent publication No. CN109374726A is that the publication date is 22 days in 2 months in 2019, the name of the publication date is 'a steel bar corrosion nondestructive dynamic monitoring sensor and system in concrete based on a magnetic field', the number of Chinese patent publication No. CN208420791U is that the publication date is 22 days in 1 month in 2019, the name of the publication date is 'a steel bar corrosion electromagnetic field variable response device', two patents provide a steel bar corrosion monitoring sensor built in concrete for monitoring the steel bar corrosion condition built in concrete, but the built-in monitoring sensor can seriously affect the mechanical property of the steel bar concrete and the natural corrosion rule of the steel bar, and the sensor built in the concrete can only be used once and has higher cost; the Chinese patent is entitled "monitoring equipment and method for steel bar corrosion behavior in concrete" with an authorization publication number CN108469514A, the publication date is 2018, 8 and 31, and the related sensor of the patent has the following defects: firstly, although the sensor can measure the corrosion condition of the steel bar, the sensor can only qualitatively judge the corrosion condition of the whole steel bar in the concrete and cannot judge the corrosion condition of a single steel bar, and the corrosion conditions of the steel bar in the concrete in actual engineering are different, so that the corrosion condition of the single steel bar needs to be measured; secondly, the human test results of the utility model prove that the influence of different positions of the steel bars on the response condition of the Hall sensor is far larger than the influence of corrosion of the steel bars, and the error is larger under the condition that the visible steel bars can not ensure the in-situ monitoring; thirdly, the Hall sensors are arranged in a single straight line direction, and the method cannot effectively monitor the change rule of the position of the steel bar; fourth, actual concrete column size is great, and this patent test need effectively block whole reinforced concrete column, and required magnetic core bayonet socket is great, warp the utility model discloses people's test result proves, and the increase of bayonet socket can lead to hall sensor detectivity to reduce. In summary, the measurement result of the sensor related to the patent can not reflect the real corrosion condition of the steel bar, and accurate and reliable data can not be obtained to predict the corrosion degree of the steel bar under different conditions.
In the actual building engineering, an external dynamic monitoring sensor and a test method for accurately measuring the corrosion rate of the steel bars still do not exist.
Therefore, the external nondestructive dynamic steel bar corrosion monitoring sensor with the advantages of clear principle, simple method, high measuring speed, repeated use, strong engineering applicability, good stability and the like is found, and the sensor has important significance for continuously and deeply evaluating and predicting the steel bar corrosion degree.
Disclosure of Invention
In order to overcome the not enough of current building engineering reinforcing bar corrosion nondestructive monitoring technique, the utility model provides a stability is high, easy and simple to handle, can realize external reinforcing bar corrosion monitoring, especially relates to the reinforcing bar corrosion monitoring technique of using based on the electromagnetic field principle: externally arranged outside the reinforced concrete structure; the bayonet of the magnetic core is designed into a trapezoidal bayonet, so that the reinforced concrete square column can be effectively clamped, and the corrosion condition of a single detection reinforcing steel bar at the corner of the reinforced concrete square column can be effectively detected; the electromagnetic field intensity is changed by controlling the current of the coil and the number of turns of the coil, so that the air field magnetic leakage influence caused by the change of the bayonet distance of the magnetic core is reduced, and the detection precision of the magnetic induction intensity of the Hall sensor is improved so as to adapt to reinforced concrete square columns with different sizes; the position of the steel bar is accurately detected through the symmetrical arrangement of the Hall sensors; the method is used for measuring the corrosion rate of the steel bar, evaluating the corrosion degree of the steel bar and predicting the service life of the steel bar so as to solve the problem that no effective method for measuring the corrosion rate of the reinforced concrete material steel bar exists at present.
In order to solve the technical problem, the utility model provides a following technical scheme:
an external steel bar corrosion nondestructive monitoring sensor based on an electromagnetic field principle comprises a magnetic induction intensity monitoring unit and a data processing unit;
the magnetic induction intensity detection unit comprises a signal generator, a coil, a magnetic core, a packaging shell, a first Hall sensor and a second Hall sensor, wherein the coil is uniformly wound on the magnetic core, and two ends of the coil are electrically connected with a signal input end of the signal generator; the middle position of the reinforced concrete test piece clamped by the fixing unit corresponds to the middle position of the bayonet of the magnetic core; the packaging shell comprises a first Hall sensor placing groove, a second Hall sensor placing groove and a sealing cover; the first Hall sensor and the second Hall sensor are symmetrically arranged by taking a bayonet center line as an axis and are respectively arranged in a first Hall sensor placing groove and a second Hall sensor placing groove of the packaging shell;
the data processing unit comprises a signal collector, a signal processor and a central controller, wherein the input end of the signal collector is electrically connected with the signal output ends of the first Hall sensor and the second Hall sensor, the signal output end of the signal generator and the output end of the signal collector are respectively electrically connected with the signal input end of the signal processor, and the signal output end of the signal processor is electrically connected with a port of the central controller.
Further, the first Hall sensor and the second Hall sensor are symmetrically arranged.
The magnetic core is a trapezoidal bayonet.
The magnetic core is made of silicon steel.
The packaging shell is made of plastic materials.
The signal generator can stably control the current of the coil.
The signal collector and the signal generator are respectively provided with a first indicator light and a second indicator light of a circuit, and the first indicator light and the second indicator light respectively prompt whether the signal collector and the signal generator work normally or not.
The Hall sensors can be symmetrically arranged in one or more pairs according to the precision requirement and the actual engineering requirement.
As an improvement, the magnetic core bayonet of the magnetic induction intensity detection unit is trapezoidal, can be firmly clamped at the corner of a reinforced concrete square column, completes the corrosion monitoring of a single detection reinforcing steel bar, and can clamp reinforced concrete columns of different sizes according to the embedding depth or the distance of the magnetic core bayonet.
As an improvement, a uniform electromagnetic field generated by the magnetic core of the magnetic induction intensity detection unit and the uniformly wound coil depends on the coil current and the number of turns of the coil, the coil cannot be demagnetized due to time change, and the detection result is accurate.
As an improvement, the magnetic core of magnetic induction detection unit, even wire-wound coil and the electro-magnet accessible control coil electric current that signal generator constitutes and the coil number of turns change the electromagnetic field intensity, through the utility model discloses the experimental test result of people proves that it can effectively reduce the air field magnetic leakage influence that the magnetic core bayonet socket distance change brought to change magnetic field intensity, improves sensor magnetic induction and detects the precision.
As an improvement, the magnetic induction intensity detection unit is externally arranged on the reinforced concrete column, so that the reutilization and the dynamic monitoring are realized.
As an improvement, the first Hall sensor and the second Hall sensor of magnetic induction detection unit use the bayonet socket central line as axis symmetrical arrangement, but through utility model people's experimental test result prove the position of accurate detection reinforcing bar.
As an improvement, the data processing unit and the related control circuit can be realized by the existing mature technology, and mainly comprises the steps of controlling the working current of the coil, measuring the magnetic induction intensity values of the first Hall sensor and the second Hall sensor, and calculating the corrosion rate. The magnetic induction intensity measuring system and the data processing system finish data storage, post-processing and real-time display through the signal processor and the central controller.
The utility model discloses a theory of operation: the Hall sensor detects the magnetic induction intensity of the magnetic induction intensity detection unit and sends the magnetic induction intensity to the signal processor, and the current of the magnetic induction intensity detection unit is controlled by the signal generator; the signal processor collects data of the signal generator and the signal collector according to the set frequency, calculates and analyzes the data, stores the collected data and the calculation result in the central controller in real time, and displays the analysis and calculation result in real time through the display screen.
The utility model has the advantages that: the utility model discloses based on the nondestructive test method, utilize the electromagnetic induction technique to realize reinforcing bar corrosion nondestructive test to calculate the corrosion rate that obtains the reinforcing bar according to theoretical formula. The limit of the test stability, accuracy and use times of the traditional test method is broken through, and the test of the corrosion rate of the steel bar of the reinforced concrete test piece is realized; the measured corrosion rate of the steel bars can be applied to the evaluation of the current service performance and the prediction of the durability of the reinforced concrete structure. The test object can be suitable for reinforced concrete square columns with different sizes, has the advantages of clear principle, simple and convenient method, high measuring speed, repeated use, good stability and the like, and can make up the defects of the prior method and the prior device for measuring the corrosion rate of the reinforcing steel bars.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic diagram of the structure before the sealing cover of the package housing of the present invention.
Fig. 3 is a top view of the sealing cover of the present invention.
Fig. 4 is the utility model discloses magnetic core bayonet socket increases sensor test result.
Fig. 5 shows the detection result of the magnetic field amplifying sensor of the present invention.
Fig. 6 shows the test result of the position detection in the x and y directions of the hall sensor.
Fig. 7 is the utility model discloses hall sensor z direction position detection test result.
Fig. 8 is the utility model discloses hall sensor reinforcing bar corrosion test result.
Reference numbers in the figures: 1-1, a first Hall sensor; 1-2, a second Hall sensor; 2. a coil; 3. a magnetic core; 4. a reinforced concrete square column; 5. detecting the reinforcing steel bars; 6. a signal collector; 7. a signal generator; 8. a signal processor; 9. a central processing unit; 10-1, a first indicator light; 10-2, a second indicator light; 11. a package housing; 11-1, a first Hall sensor placing groove; 11-2, placing a second Hall sensor groove; 11-3 and sealing the cover.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings
Referring to fig. 1 to 8, an external steel bar corrosion nondestructive monitoring sensor based on an electromagnetic field principle comprises a magnetic induction intensity monitoring unit and a data processing unit;
the magnetic induction intensity detection unit comprises a signal generator 7, a coil 2, a magnetic core 3, a packaging shell 11, a first Hall sensor 1-1 and a second Hall sensor 1-2, wherein the coil 2 is uniformly wound on the magnetic core 3, and two ends of the coil 2 are electrically connected with a signal input end of the signal generator 7; the middle position of the reinforced concrete test piece clamped by the fixing unit corresponds to the middle position of the bayonet of the magnetic core 3; the packaging shell 11 comprises a first Hall sensor placing groove 11-1, a second Hall sensor placing groove 11-2 and a sealing cover 11-3; the first Hall sensor 1-1 and the second Hall sensor 1-2 are symmetrically arranged by taking a bayonet center line as an axis and are respectively arranged in a first Hall sensor placing groove 11-1 and a second Hall sensor placing groove 11-2 of the packaging shell 11;
the data processing unit comprises a signal collector 6, a signal processor 8 and a central controller 9, wherein the input end of the signal collector 6 is electrically connected with the signal output ends of the first Hall sensor 1-1 and the second Hall sensor 1-2, the signal output end of the signal generator 7 and the output end of the signal collector 6 are respectively electrically connected with the signal input end of the signal processor 8, and the signal output end of the signal processor 8 is electrically connected with a port of the central controller 9.
Further, the first Hall sensor 1-1 and the second Hall sensor 1-2 are symmetrically arranged.
The magnetic core 3 is a trapezoidal bayonet.
The magnetic core 3 is made of silicon steel.
The packaging shell is made of plastic materials.
The signal generator 7 can stably control the current of the coil.
The signal collector 6 and the signal generator 7 are respectively provided with a first indicator light 10-1 and a second indicator light 10-2 of a circuit, and the indicator lights respectively prompt whether the signal collector 6 and the signal generator 7 work normally or not.
The Hall sensors 7 can be symmetrically arranged in one or more pairs according to the precision requirement and the actual engineering requirement.
As an improvement, the utility model discloses in 3 bayonet sockets of magnetic core of magnetic induction detection unit are trapezoidal shape, can firmly block in the edge of reinforced concrete square column, accomplish the monitoring of 5 corrosion of single detection reinforcing bars, and can block not unidimensional reinforced concrete column according to the embedding degree of depth or change magnetic core bayonet socket distance.
As an improvement, the utility model provides a magnetic core 3 of magnetic induction detecting element and the even strong electromagnetic field that even wire-wound coil 2 generated depend on 2 electric currents of coil and 2 turns of coil, can not be because of time variation degaussing, the testing result is accurate.
As an improvement, in the utility model discloses in electromagnet accessible control coil electric current and the coil number of turns that magnetic core 3, even wire-wound coil 2 and signal generator 7 of magnetic induction detecting element constitute change the electromagnetic field intensity, through the utility model discloses the experimental test result of people proves that it can effectively reduce the influence of magnetic core bayonet socket distance change brought air domain magnetic leakage to change magnetic field intensity, improves sensor magnetic induction and detects the precision.
As an improvement, the utility model provides a magnetic induction intensity detecting element arrange reinforced concrete column 4 in outward to realize reuse and dynamic monitoring.
As an improvement, the utility model discloses in first hall sensor 1-1 and second hall sensor 1-2 of magnetic induction detecting element use the bayonet socket central line to arrange as axis symmetry, but through utility model people test result prove the position of accurate detection reinforcing bar.
As an improvement, data processing unit, the usable existing mature technology of its relevant control circuit realizes, thereby mainly includes control coil 2's operating current, survey first hall sensor 1-1 and second hall sensor 1-2's magnetic induction intensity value calculates out the corrosion rate. The magnetic induction intensity measuring system and the data processing system complete data storage, post-processing and real-time display through the signal processor 8 and the central controller 9.
Example 2, a HPB300 plain round bar with a bar diameter of 16mm and a length of 20cm, the concrete raw materials were: the cement is P.I 525 grade Portland cement, the sand adopts river sand with fineness modulus of 2.6, the coarse aggregate adopts continuous graded broken stone (the maximum grain diameter is 25mm), the water adopts tap water, the effective section dimension of a cast test piece in a standard die is 100mm multiplied by 100mm, the length of a steel bar is 200mm, the protruding length of the steel bars at two sides is 50mm, the length of the test piece is 100mm, the standard maintenance is carried out in a maintenance room for 28d after the cast molding, and the influence of the position change of the steel bar on the magnetic induction intensity by taking the cast reinforced concrete test piece as an example is specifically explained:
the x-axis is established in the front-back direction, the y-axis is established in the left-right direction, and the z-axis is established in the up-down direction. And moving the reinforced concrete test piece to the center of the sensor magnetic core bayonet, and defining the three-dimensional relative coordinate value (x, y, z) of the center of the magnetic core bayonet as (0,0, 0).
The reinforced concrete test piece is moved along the z direction, the magnetic induction intensity value and the z coordinate value of the Hall sensor are recorded, the test data are shown in figure 7, the magnetic induction intensity monitoring value cannot be changed when the effective length of the steel bar in the bayonet area is not changed according to the test data, and the magnetic induction intensity monitoring value can be obviously reduced when the moving distance of the steel bar along the z direction is increased to the effective length of the steel bar in the bayonet area.
The reinforced concrete test piece is moved along the x direction and the y direction, the magnetic induction intensity value, the x coordinate value and the y coordinate value of the Hall sensor are recorded, the test data are shown in figure 6, and the test data can show that the magnetic induction intensity monitoring value is greatly influenced when the steel bar moves along the x direction and the y direction.
When specifically realizing, the utility model discloses do not restrict specific device model, as long as can accomplish the components and parts of above-mentioned function all can.
The testing method of the external reinforcement corrosion nondestructive monitoring sensor based on the electromagnetic field principle takes an HPB300 smooth round reinforcement with the diameter of 16mm as an example, and comprises the following steps:
firstly, preparing a reinforced concrete test piece before testing, wherein the process is as follows:
1.1 taking 20cm long plain steel bar with diameter of 16mm as calibration steel bar and steel bar to be measured, weighing the mass m of the steel bar to be measured1I，m2I，m3I，m4I，m5I，m6I，m7IAnd calibrating the steel bar mass m0And recording;
1.2 coating epoxy resin at 5cm positions at two ends of the calibration steel bar and the steel bar to be detected in a mold and pouring for molding, wherein the concrete comprises the following raw materials: the cement is P.I 525 grade Portland cement, river sand with fineness modulus of 2.6 is adopted as the sand, continuous graded broken stone (the maximum grain diameter is 25mm) is adopted as coarse aggregate, tap water is adopted as water, the effective section size of a cast test piece in a standard die is 100mm multiplied by 100mm, the length of a steel bar is 200mm, the protruding length of the steel bars on two sides is 50mm, the length of the test piece is 100mm, the standard maintenance is carried out in a maintenance room for 28d after the cast molding is carried out, the calibrated reinforced concrete test piece and the reinforced concrete test piece to be tested after the cast molding are soaked in a standard salt concentration solution until the salt is saturated, and the concentration of the standard sodium chloride solution is 0.1-2 mol/L;
second, preparation before measurement, as follows:
2.1 uniformly winding an enameled copper wire in the same direction around an upper magnetic core 3 to form a coil 2, mounting a first Hall sensor 1-1 and a second Hall sensor 1-2 in a first Hall sensor placing groove 11-1 and a second Hall sensor placing groove 11-2 of a packaging shell 11, then electrifying to form a uniform strong electromagnetic field, and covering a sealing cover 11-3 for packaging;
2.2 the central controller 9 controls the collection frequency of the signal collector 6 and the current of the signal generator 7, and the magnetic field is electrified and tested, so that the magnetic induction intensity gauss values of the first Hall sensor 1-1 and the second Hall sensor 1-2 are the same.
Thirdly, a calibration test is carried out, and the process is as follows:
3.1 recording mass m1I，m2I，m3I，m4I，m5I，m6I，m7ICorresponding magnetic induction intensity data B of calibration reinforcing steel bar before corrosion of reinforced concrete test piece1I，B2I，B3I，B4I，B5I，B6I，B7I；
3.2 realize the simulation experiment of reinforcing bar corrosion with the mode of corrosion is accelerated to the electric current, and control current density is the same, and the quality is m1I，m2I，m3I，m4I，m5I，m6I，m7IElectrifying the corresponding reinforced concrete test pieces for 1 day, 2 days, 3 days, 4 days, 5 days, 6 days and 7 days respectively;
3.3 recording the magnetic induction intensity data B of the calibration steel bar after the reinforced concrete test piece is corroded1II，B2II，B3II，B4II，B5II，B6II，B7IIAnd steel bar quality data m1II，m2II，m3II，m4II，m5II，m6II，m7II；
3.4 respectively calculating and calibrating the change rate Delta m of the steel bar quality1，△m2，△m3，△m4，△m5，△m6，△m7The calculation formulas are respectively formulas (1) to (7);
3.5 respectively calculating and calibrating the magnetic induction intensity change rate Delta B of the steel bars1，△B2，△B3，△B4，△B5，△B6，△B7The calculation formulas are respectively the formulas (8) to (14)
3.6, carrying out linear fitting on the relationship between the change rate of the steel bar mass and the change rate of the magnetic induction intensity of the Hall sensor to obtain a linear relationship coefficient alpha;
step four, measuring the test, the process is as follows:
4.1 recording the magnetic induction intensity B before the piece to be tested is rusted0I；
4.2 placing the reinforced concrete to be tested in an environment which is easy to cause the reinforcing steel bars to be corroded so as to promote the reinforcing steel bars to be corroded;
4.3 the corroded test piece to be tested is put back to the original position, and the magnetic induction intensity B after the steel bar is corroded is recorded0II；
4.4 Corrosion Rate p of Steel barsIIThe calculation formula is formula (15)
PII＝α(B0II-B0I) (15)。
Finally, it should be noted that the above list is only for the specific embodiment of the new concrete configuration in the testing laboratory, and does not limit the present invention. For the reinforced concrete structure sampled from the existing engineering, the process and method are completely consistent, and the details are not repeated here.
The embodiments of the present invention are merely provided to illustrate the embodiments of the present invention, and the protection scope of the present invention should not be construed as being limited to the specific forms of the embodiments, but also includes the equivalent technical means which can be conceived by those skilled in the art according to the present invention.
Claims (9)
1. An external flowing type nondestructive testing and monitoring sensor for corrosion of a steel bar based on an electromagnetic field principle is characterized by comprising a magnetic induction intensity detection unit and a data processing unit;
the magnetic induction intensity detection unit comprises a signal generator, a coil, a magnetic core, a first Hall sensor and a second Hall sensor of a packaging shell, wherein the coil is uniformly wound on the magnetic core, and two ends of the coil are electrically connected with a signal input end of the signal generator; the middle position of the reinforced concrete test piece clamped by the fixing unit corresponds to the middle position of the bayonet of the magnetic core; the packaging shell comprises a first Hall sensor placing groove, a second Hall sensor placing groove and a sealing cover; the first Hall sensor and the second Hall sensor are symmetrically arranged by taking a bayonet center line as an axis and are respectively arranged in a first Hall sensor placing groove and a second Hall sensor placing groove of the packaging shell;
the data processing unit comprises a signal collector, a signal processor and a central controller, wherein the input end of the signal collector is electrically connected with the signal output ends of the first Hall sensor and the second Hall sensor, the signal output end of the signal generator and the output end of the signal collector are respectively electrically connected with the signal input end of the signal processor, and the signal output end of the signal processor is electrically connected with a port of the central controller.
2. The external flow type nondestructive testing and monitoring sensor for corrosion on steel bars based on electromagnetic field principle as claimed in claim 1, wherein in the magnetic induction intensity detection unit, the first hall sensor and the second hall sensor are symmetrically arranged, and the position of the steel bar is accurately detected by different magnetic induction intensities.
3. The external flowing type steel bar corrosion nondestructive testing and monitoring sensor based on the electromagnetic field principle as claimed in claim 1 or 2, wherein in the magnetic induction intensity detection unit, the magnetic core is made of silicon steel, and the packaging shell is made of plastic.
4. The external flowing type nondestructive testing and monitoring sensor for steel bar corrosion based on electromagnetic field principle as claimed in claim 1 or 2, wherein in the magnetic induction intensity detecting unit, the bayonet of the magnetic core is trapezoidal, and can be firmly clamped at the corner of the reinforced concrete square column to complete the monitoring of single steel bar corrosion detection, and the steel bar concrete columns with different sizes can be clamped according to the embedding depth or the distance of the bayonet of the magnetic core.
5. The external flowing type steel bar corrosion nondestructive testing and monitoring sensor based on the electromagnetic field principle as claimed in claim 1 or 2, wherein the signal generator can stably control the current of the coil; the signal collector and the signal generator are respectively provided with a first indicator light and a second indicator light of a circuit, and the first indicator light and the second indicator light respectively prompt whether the signal collector and the signal generator work normally or not.
6. The external flow type steel bar corrosion nondestructive detection and monitoring sensor based on the electromagnetic field principle as claimed in claim 1 or 2, wherein the hall sensors can be symmetrically arranged in one or more pairs according to the precision requirement and the actual engineering requirement.
7. The external flowing type steel bar corrosion nondestructive testing and monitoring sensor based on the electromagnetic field principle as claimed in claim 1 or 2 is characterized in that the uniform electromagnetic field generated by the magnetic core of the magnetic induction intensity detection unit and the uniformly wound coil depends on the coil current and the number of turns of the coil, and is not demagnetized due to time change, and the detection result is accurate.
8. The external flowing type steel bar corrosion nondestructive detection and monitoring sensor based on the electromagnetic field principle as claimed in claim 1 or 2 is characterized in that the electromagnet consisting of the magnetic core, the uniformly wound coil and the signal generator can change the intensity of the electromagnetic field by controlling the current of the coil and the number of turns of the coil, the influence of magnetic leakage in an air domain caused by the change of the bayonet distance of the magnetic core can be effectively reduced by changing the intensity of the magnetic field, and the detection precision of the magnetic induction intensity of the sensor is improved.
9. The external flowing type steel bar corrosion nondestructive testing and monitoring sensor based on the electromagnetic field principle as claimed in claim 1 or 2, wherein the data processing unit calculates the corrosion rate by using the working current of the control coil and measuring the magnetic induction intensity values of the first hall sensor and the second hall sensor, and the magnetic induction intensity measuring system and the data processing system complete data storage, post-processing and real-time display through a signal processor and a central controller.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110646505A (en) * | 2019-10-18 | 2020-01-03 | 浙江工业大学 | External reinforcement corrosion nondestructive monitoring sensor based on electromagnetic field principle and testing method |
| CN113720756A (en) * | 2021-08-25 | 2021-11-30 | 浙江工业大学 | Range finding adjustable reinforcing bar corrosion magnetic induction sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110646505A (en) * | 2019-10-18 | 2020-01-03 | 浙江工业大学 | External reinforcement corrosion nondestructive monitoring sensor based on electromagnetic field principle and testing method |
| CN113720756A (en) * | 2021-08-25 | 2021-11-30 | 浙江工业大学 | Range finding adjustable reinforcing bar corrosion magnetic induction sensor |
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