CN208505960U - A kind of modularization electric field fingerprint detection system based on lacing film - Google Patents
A kind of modularization electric field fingerprint detection system based on lacing film Download PDFInfo
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- CN208505960U CN208505960U CN201820185116.0U CN201820185116U CN208505960U CN 208505960 U CN208505960 U CN 208505960U CN 201820185116 U CN201820185116 U CN 201820185116U CN 208505960 U CN208505960 U CN 208505960U
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Abstract
The utility model provides a kind of modularization electric field fingerprint detection system based on lacing film, is a kind of detection system for combining corrosion coupon method with electric field fingerprint method.Voltage acquisition electrode matrix and temperature sensor are set on corrosion coupon, and lacing film is placed in the corrosive environment for being synchronized detection.The on-off between voltage acquisition electrode matrix and data acquisition module is controlled by matrix switch, detect real-time voltage and its variation of the lacing film after load energizing current, the germinating and development process of local corrosion can be effectively captured, effectively local corrosion can be tracked and studies its corrosion mechanism.This modularization electric field fingerprint detection system, have many advantages, such as that excitation is small, precision is high, integrated, good reliability, highly-safe, using high performance controller, acquisition real time information can be programmed according to demand, the real time data of environmental parameter can accurately be obtained, there is better temperature-compensating system, convenient for analysis and research.
Description
Technical field
The present invention relates to detection technique fields, are related to detection system and method, are specifically a kind of modularization detection system.
Background technique
Corrosion coupon method be it is the most frequently used be also most classic corrosion research, monitoring and evaluation method, infrastructure construction,
Being most widely used in the process industries such as Naval Architecture and Ocean Engineering, petrochemical industry.The material of corrosion coupon generally with it is monitored
The material of object is close or identical；To adapt to different monitoring situations, the types such as flat, sheet are may be selected in the type of lacing film；It hangs
The direction of piece should not influence the flowing of fluid, and the big plane for being typically chosen lacing film is parallel to liquid flow path direction.The standing time of lacing film
It is not fixed, the duration of lacing film is determined with extent of corrosion, generally need even half a year several months.Popular says, corrosion coupon method is logical
It crosses the designated position in monitored target and metal lacing film is set, fetch extension after exposure a period of time in specified corrosive environment
Piece, being corroded situation and infer the corrosion condition of monitored target by lacing film.This Corrosion monitoring technical price is cheap, behaviour
Make simply, data reliability is high, can test simultaneously to multiple material, be suitable for various media.But it there is also surveys
The examination time is longer, and the corrosion data provided is limited, cannot reflect that instantaneous corrosion rate and environmental condition or technological parameter become in time
Change the immediate impact to corrosion, it is difficult to realize real-time monitoring, can not detect the germinating and development of corrosion, etching machine cannot be provided
The detection and analysis of reason information, especially hanging slice method need to carry out under the conditions of offline, cannot timely provide safe early warning information.
Electric field fingerprint (FSM) detection technique is a kind of novel non-destructive testing technology, by being arranged on monitored target
Acquisition matrix acquires the electric current and voltage of monitored target.And if monitored target is corroded, this corrosion will react in electric current
With the variation of voltage.Electric field fingerprint corrosion monitoring technology changes according to measurand surface small voltage, lacks to metal structure
Sunken, crackle, corrosion and their spread scenarios carry out high-precision detection, and this monitoring method can be monitored pair of Real-time Feedback
The data such as voltage, the electric current of elephant, realize on-line real time monitoring and monitoring accuracy and accuracy are very high, can distinguish different corrosion classes
Type.Since the equivalent resistance for being detected region is very small, the equipment either introduced for a long time from foreign countries or the country
Newly developed equipment, is all the acquisition precision for guaranteeing to respond voltage by increasing feed-in electric current, and the order of magnitude of electric current is general
All between 10A~250A.And excessive joule heating effect for easily causing metal specimen of feed-in electric current etc. changes, and acquires to data
Interfere, and influence also to can't be ignored brought by the fluctuation of excitation power supply itself, thus stability for electric current and
Temperature-compensating there is very high requirement.Furthermore, it usually needs it is separately configured High Output Current power supply, device integration is high,
Inconvenient, the human safety issues of operator are also required to cause enough attention.
Summary of the invention
It is an object of the invention to the deficiency and electric field fingerprint method non-destructive testing technology for hanging slice method in the prior art are existing
Some problems existing for stage, provide it is a kind of can real-time detection measurand corrosion condition, weak excitation, high-precision, integration
Electric field fingerprint detection system.
In order to realize the above effect, the present invention the following technical schemes are provided:
Modularization electric field fingerprint detection system based on lacing film, it is characterised in that: including tested corrosive environment can be hung on
In lacing film, current fed electrode is provided on the lacing film and electric current feeds out electrode, voltage acquisition electrode matrix and temperature and passes
Sensor；It further comprise data processing module and data collection system, the data collection system includes high speed matrix switch mould
Block and multimeter module, the input terminal of high speed matrix switch module connect with each electrode of voltage acquisition electrode matrix respectively
It connects, output end is connect with multimeter module, and the data of multimeter acquisition are transferred to data processor.
As preferred: the data collection system further comprises power module, the output end of power module and the extension
The current fed electrode and electric current at piece both ends feed out electrode connection.
As preferred: the data collection system further comprises multichannel temperature acquisition module, the multichannel temperature
Acquisition module is connect with the temperature sensor on lacing film.
As preferred: the modularization electric field fingerprint detection system further comprises corrosive environment parameter sensors, described
Data collection system further comprises multichannel voltage acquisition module and multichannel analog current acquisition module, corrosive environment parameter
Sensor includes environment temperature sensor, humidity sensor, air velocity transducer, salinity sensor, pressure sensor, redox
Potentiometric sensor, acidity-basicity sensor, dissolved oxygen sensor, flow sensor；Voltage-type environmental parameter sensor and multichannel
Voltage acquisition module connection, current mode environmental parameter sensor are connect with multi channel currents acquisition module, environment temperature sensor
It is connect with multichannel temperature acquisition module.
As preferred: the processor uses PXIe processor；The power module uses PXIe programmable power supply module；
The high speed matrix switch module uses PXI high speed matrix switch module；The multimeter uses PXIe digital multimeter module；
The multichannel temperature acquisition module uses PXIe temperature collecting module；The multichannel voltage acquisition module uses PXIe voltage
Acquisition module；The multi channel currents acquisition module uses PXIe current acquisition module；The PXIe processor, PXIe are programmable
Power module, PXI high speed matrix switch module, PXIe digital multimeter module, PXIe temperature collecting module, PXIe voltage acquisition
Module, PXIe current acquisition module are integrated in PXIe cabinet.
As preferred: the probe and the lacing film of the corrosive environment parameter sensors are installed on same corrosive environment side by side
Designated position.
As preferred: the material of the lacing film and the material of monitored target are identical.
The invention has the benefit that
(1) present invention combines hanging slice method with electric field fingerprint method, is measured in real time, can effectively catch to measured piece
The germinating and development process of spot corrosion are grasped, effectively can detect and study its corrosion mechanism to spot corrosion, quasi-complement is hung
The deficiency of piece method.This method all brings the advantage of hanging slice method and electric field fingerprint method respectively into play, acquires corrosion data abundant,
The dynamic data of effective acquisition corrosion, can greatly improve the Efficiency of metal erosion mechanism, and can reflect in time
It is influenced brought by different parameters variation, collects and analyze and give corrosion control offer significantly more efficient real time data, give scene peace
More efficient technical support is provided entirely.
(2) this modularization corrosion detection system has and motivates that small, precision is high, integrated level is high, good reliability, highly-safe
The advantages that, using high performance controller, acquisition real time information can be programmed, according to demand to analyze and research.Lacing film is carried out real
When detect, can get corrosion real time information, influence of the Parameters variation to corrosion instantly, which can be obtained, feeds back and records and analyzes rapidly,
Can requirement according to the actual situation hardware system is adjusted, real-time corrosion information can not only be obtained to be regulated and controled, and
The Efficiency to corrosion mechanism can be greatly improved, corrosion big data is enriched.
(3) different lacing film schemes can be customized, environment ginseng is preferably recorded according to different corrosive environments, different measured objects
Influence of the number variation to corrosion, and binding test method can significantly more efficient accurate detection local corrosion.
(4) by being formed using the modular instrument of PXIe bussing technique, support flexibly reconfigures test macro, is easy to
It builds, high reliablity, cost performance is high.Based on PXIe bussing technique, it is consistent to make it have the environment that rank is higher, definition is more rigorous
Property index, meet and vibrate, hit, the maximum conditions of temperature and humidity under industrial environment.
Detailed description of the invention
Voltage pattern when Fig. 1 (a) is 20 DEG C of analogue simulation Q235 steel；
Voltage pattern when Fig. 1 (b) is 30 DEG C of analogue simulation Q235 steel；
Voltage pattern when Fig. 1 (c) is 40 DEG C of analogue simulation Q235 steel；
Voltage pattern when Fig. 1 (d) is 50 DEG C of analogue simulation Q235 steel；
Voltage pattern when Fig. 1 (e) is 60 DEG C of analogue simulation Q235 steel；
Voltage pattern when Fig. 1 (f) is 70 DEG C of analogue simulation Q235 steel；
Voltage pattern when Fig. 1 (g) is 80 DEG C of analogue simulation Q235 steel；
Voltage pattern when Fig. 1 (h) is 90 DEG C of analogue simulation Q235 steel；
Voltage pattern when Fig. 1 (i) is 100 DEG C of analogue simulation Q235 steel；
Fig. 2 is Q235 steel temperature and voltage matched curve.
Fig. 3 is temperature compensation data library Establishing process figure；
Fig. 4 is testing process schematic diagram；
Fig. 5 is hanging chip structure schematic diagram；
Fig. 6 is detection system structure；
Fig. 7 is overhaul flow chart；
Fig. 8 is current density and voltage equipotentiality slice map.
Wherein, 1- lacing film, 2- voltage acquisition electrode matrix, 3- feed electrode, 4- feed out electrode, and 5- corrosive environment parameter passes
Sensor matrix, 6- multichannel voltage acquisition module, 7- multi channel currents acquisition module, 8- constant-current source, 9- temperature collecting module.
Specific embodiment
A specific embodiment of the invention progress is described clear and completely below with reference to attached drawing.Obviously, it is embodied
Mode described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Based in the present invention
Embodiment, those of ordinary skill in the art's every other embodiment obtained without making creative work,
Belong to protection scope of the present invention.
The present invention provides a kind of electric field fingerprint detection system and detection method based on hanging slice method, which can
The real-time online detection for realizing measured object damage has many advantages, such as that integrated level is high, reaction is fast, excitation is small, detection accuracy is high.
The present embodiment provides a kind of detection system first, which can be used for the fields such as petroleum pipeline metal measured object
Corrosion monitoring, be suitable for natural environment corrosion detection and laboratory internal corrosion mechanism study etc..
Modularization detection system is a kind of detection system that corrosion coupon method is combined with electric field fingerprint method.Including that can hang
The lacing film 1 being hung on detected material, and connect with lacing film 1, the power module of electric current is provided for lacing film 1.Hanging chip structure reference
Fig. 5 is provided with voltage acquisition electrode matrix 2 according to the size of lacing film 1 on lacing film, and the range of voltage acquisition electrode matrix 2 is
For effective detection zone of lacing film sample；Voltage acquisition electrode matrix is similar to the acquisition matrix of electric field fingerprint method, and effect is
The current or voltage index fed back on measurement lacing film 1.In the present embodiment, voltage acquisition electrode matrix is directly welded at lacing film sample
On.When carrying out detection work, lacing film 1 is suspended on measured object, due to being in same working environment with measured object, if by
It surveys object to be damaged, lacing film 1 will will receive same or similar with measured object like damage.And in order to more accurately react tested
The material of the degree of impairment of object, lacing film 1 is identical as detected object or the similar material of property.
When carrying out detection work, need to be based on this for the external constant-current source 8 of lacing film 1, be provided on lacing film 1 feed electrode 3 and
Feed out electrode 4, voltage module with respectively with the feed electrode of lacing film 3 and feed out electrode 4 and connect, to for 1 external impressed current of lacing film.
Feed electrode 3 and to feed out electrode 4 be two individual electrodes different from electrode acquisition matrix 2, is separately positioned on the two of lacing film 1
End.In the present embodiment, voltage module, which uses, has 2 in programmable DC power supply PXIe-4112, PXIe-4112 DC power supply
Channel isolation, each channel isolation can produce within as low as 10mV, greatly to the adjustable constant-current source of 1A, and PXIe-4112 has
16 bit resolutions can both set the current value and stop voltage of output, can also echo the electric current and voltage of reality output in real time,
It is to be responsible for leading to stable DC electricity settable within 1A to lacing film to be measured in systemic effect.
Corrosion the result is that the voltage value or current value that are fed back by voltage acquisition electrode matrix 2 on lacing film 1 are sentenced
Disconnected.Based on this, detection system further comprises processor and data collection system, to acquire the electric current or electricity of the feedback of lacing film 1
Pressure.Detection system structural reference Fig. 6.
The data collection system includes matrix switch, multimeter and temperature collecting module.Temperature collecting module is to adopt
Collect environment temperature, the voltage data of multimeter acquisition and the temperature data of temperature collecting module acquisition are transferred to processor.
An electrode in each switch input point connection voltage acquisition electrode matrix of matrix switch, output end and ten thousand
It is connected with table, multimeter can switch the voltage between upper any two switch every time with acquisition matrix, that is, on acquisition matrix
Voltage between any two matrix dot.Specifically, matrix switch combination multimeter is mainly used for acquiring measurand because of corruption
Potential change caused by alteration.In the present embodiment, matrix switch is switched using PXI-2535 high speed matrix conversion, multimeter
Using PXIe-4081 digital multimeter.PXIe-4081 is a 71/2Position precision digital multimeter, can rapidly and accurately carry out ±
Voltage measurement in 10nV to 1000V range, the current measurement in ± 1pA to 3A range, the resistance measurement of 10 μ Ω to 5G Ω with
And frequency/period and diode measurement；Under high-voltage isolating digitizer mode, PXIe-4081 can be with the acquisition of 1.8MS/s
Rate carries out waveform acquisition.PXI-2535 low noise matrix switch can be up to 50,000 crosspoint/seconds in systems with it
Switch speed to carry out free switching to up to 136 acquisition electrodes, and specific switching mode can program setting according to demand,
Multiple PXI-2535 and with greater number of electrode acquisition channel can be extended.By PXIe-4112, PXIe-4081 and PXI-
2535 are used together, and can create the electrode of up to ± 12VDC/8VAC, up to 136 and expansible high density automatic test system
System.
Temperature collecting module is mainly used for temperature of the lacing film in corrosive environment.The acquisition of electric field fingerprint technology is metal hanging
Voltage signal obtained from piece self-resistance and exciting current product, then the compensation to temperature just has very high requirement.Gold
Belong to the resistivity meeting variation with temperature of material and changes, it is therefore desirable to the temperature of accurate acquisition lacing film, in order to more accurate
Reaction detection is as a result, better method is that the suitable temperature-compensation method of selection is modified data acquisition results.This implementation
In example, temperature collecting module includes field temperature sensor and the PXIe-4357 temperature for collection site temperature sensor data
Spend detector.The probe of field temperature sensor is fixed on lacing film to be measured.PXIe-4357 can be surveyed with 2 lines, 3 lines and 4 line RTD
Amount compatibility, automatic detection and channel attached RTD type simultaneously can automatically be configured to every channel appropriate mode.
Further, data collection system further includes multichannel analog current acquisition module 7, multichannel analog voltage acquisition
Module and corrosive environment parameter sensors matrix 5.Wherein, corrosive environment parameter sensors matrix include environment temperature sensor,
Humidity sensor, air velocity transducer, salinity sensor, pressure sensor, oxidation-reduction potential sensor, acidity-basicity sensor,
Dissolved oxygen sensor, flow sensor etc.；Voltage-type environmental parameter sensor is connect with multichannel voltage acquisition module, current mode
Environmental parameter sensor is connect with multi channel currents acquisition module, and temperature sensor is connect with multichannel temperature acquisition module.It is rotten
Erosion environmental parameter sensor matrix is used to acquire the environmental index such as salinity, pressure and the humidity in measured object working environment.Due to
Here we choose the sensor of a variety of different affecting factors to the complexity of corrosive environment, and sensor converts various environmental factors
For voltage or current signal, acquired in real time by acquiring analog voltage signal and analog current signal respectively as salinity, pressure,
The delta data of the varying environments factor such as humidity, pH value, and then the variation of varying environment factor is analyzed to the Different Effects of corrosion.This
In embodiment, multichannel analog current acquisition module is adopted using PXIe-4309 analog voltage acquisition module, multichannel analog electric current
Collect module and uses PXIe-4303 analog current acquisition module.PXIe-4309 and PXIe-4303 is belonging respectively to multichannel, high-precision
The analog voltage input module and analog current input module of degree, high sampling rate, can be according to varying environment factor, not simultaneous interpretation of arranging in pairs or groups
Sensor is arranged to be attached.
Above-mentioned multimeter, temperature sensing unit, multichannel analog voltage acquisition module, multichannel analog current acquisition module
The data of acquisition are transferred to data processing module.
Processor uses PXIe-8840 central processing unit in the present embodiment.PXIe-8840 central processing unit, PXI-2535
High speed matrix conversion switch, PXIe-4081 digital multimeter, are integrated in PXI cabinet PXIe-4112 DC power supply.It is this
Modular structure design is conducive to the extension and maintenance of system.
In order to realize function of the invention, the data processing module is specifically included:
Primary data storage unit: the data of data collection system acquisition when storing detection system starting；Initial number
First group of data collected when referring to detection system starting operation according to storage unit, including initial temperature, initial current and just
Beginning voltage, initial environment parameter etc..Primary data storage unit will store the specific measurement data of each electrode.Due to initial work
When making, measured object is not damaged, and therefore, primary data will be as the subsequent reference number for judging measured object and whether being damaged
According to.
Real-time data memory unit: the real-time acquisition number to store data collection system in detection system detection process
According to；The data volume of real-time data memory unit storage is big, including real time temperature, real-time voltage, real-time current, real time environment parameter
Deng.
Corrosion results feedback unit: to the comparison according to primary data storage unit and intermediate data storage cell data
As a result the damage results of measured object are fed back.The resistance of measured object and temperature are damaged that situation is related, and this variation will be by real-time
Voltage and real-time current feedback, therefore, based on the difference between real time data and primary data, can feed back real-time corrosion feelings
Condition.
It is influenced by metallic character, in the case where variation of ambient temperature or metal own temperature change, voltage metal meeting
Can change therewith, and at this time collected voltage value can not real-time and precise feed back the reliable voltage value of object to be detected.Solution
Certainly the method for this problem is to carry out temperature-compensating to the voltage value of data acquisition unit acquisition.
Present invention can be implemented in different natural environments, process environments, and it is directed to different corrosive environments, to detection system
The hardware composition of system can be varied, such as in soil environment, we can detect for environmental parameters such as humidity, microorganisms
And the research of corrosion mechanism is carried out according to real-time corrosion data；In marine environment, we can be for environment such as salinity, oxygen content
Parameter is detected and carries out the research of corrosion mechanism according to real-time corrosion data；In sulfur recovery technology environment, we understand needle
The parameters such as concentration of medium, flow velocity are detected and are carried out according to real-time corrosion data with the research of corrosion mechanism.
Wherein, modularization electric field fingerprint detection system its high-precision feature in the present invention, is particularly suitable for it in reality
It tests in room and does associated erosion research, effectively improve corrosion research efficiency.
Therefore, as a kind of more optimal solution of the invention, controller further comprises temperature compensation unit, due to metal
Temperature and voltage characteristic it is related with metal species, therefore temperature compensation unit according to the type storage temperature of metal compensate mould
Type.
The derivation process of model of temperature compensation is as follows.
S1: the material model of metal to be detected is established.
COMSOL is multiple physical field modeling software.The present invention utilizes COMSOL simulation software, in COMSOL simulation software
The material simulation model for establishing metal to be detected arranges voltage acquisition matrix after calculating effective detection zone on effective detection zone；
For example, establishing the material model of cast steel in simulation software, and be passed through electricity to two end of model if object to be detected is cast steel
Stream；And in order to acquire the voltage value in the case of extra electric field, voltage acquisition electrode or voltage acquisition square are arranged on model
Battle array, so as to obtain voltage value.
S2: simulating different ambient temperature values, and obtains the voltage value under different temperatures gradient.
Different temperature is simulated, and obtains metal material model under the different temperatures gradient of voltage acquisition matrix feedback and obtains
Voltage value；These data are stored with the corresponding relationship of temperature and voltage.
In the present embodiment, by taking Q235 steel as an example, carry out the influence that analogue simulation temperature change generates voltage.Extremely such as Fig. 1 (a)
Shown in Fig. 1 (i), in the temperature changing process that has reacted from 20 DEG C to 100 DEG C, with every 10 DEG C for a gradient, with temperature
Variation, the significant change of voltage.Voltage value from left to right gradually rises from single model, on the whole as the temperature rises
The color on right side is obviously deepened, and illustrates that as the temperature rises, voltage value becomes larger.
We carry out grid dividing (grid is equidimension division) to above-mentioned model built, extract number from effective detection zone
According to and being pre-processed to data, theoretically the interelectrode voltage value phase in corrosion-free situation under equidimension acquisition matrix
Deng, and there are fine differences due to random error, between numerical value, in order to reduce the data obtained error, at identical temperature
Data be averaged, make it closer to the true value under Current Temperatures, the temperature change of acquisition and the numerical value of voltage change are corresponding
Table, as shown in table 1:
The numerical value of 1 temperature change of table and voltage change corresponds to table
| Temperature (degree Celsius) | Voltage (volt) | Temperature (degree Celsius) | Voltage (volt) |
| 20 | 0.000001996088 | 70 | 0.000002322014 |
| 30 | 0.000002056839 | 80 | 0.000002393810 |
| 40 | 0.000002120404 | 90 | 0.000002467178 |
| 50 | 0.000002185589 | 100 | 0.000002542569 |
| 60 | 0.000002252793 |
S3: fitting voltage return equation.
Temperature voltage recurrence side is fitted using the method for regression analysis according to the corresponding relationship of temperature value and voltage value
Journey.There are many software of regression analysis, in the present embodiment, using SPSS (Statistical Product and Service
Solutions) statistical analysis software come assist carry out regression analysis.The different temperatures value and temperature value of above-mentioned acquisition is corresponding
Voltage value be directed into analysis software in, carry out regression fit.
Voltage return equation after final fitting are as follows:
U=a+b*T+c*T2, wherein T is temperature-changeable angle value, and U is the measurement voltage of voltage acquisition electrode-feedback under temperature T
Value, a, b and c are obtained in the regression equation according to obtained in the regression analysis that different metal material carries out, because of metal material
Difference and it is different.
Still by taking Q235 steel as an example, based on data described in table 1, temperature and voltage relationship are fitted, matched curve
As shown in Fig. 2, fitting voltage return equation are as follows:
U=1.8799*10-6+5.5977*10-9*T+1.02997*10-11*T2。
S4: temperature-compensating equation is derived.
The temperature value and voltage value of any two moment t1 and t2 are taken, obtains voltage return equation respectively:
U1=a+b*T1+c*T1 2；
U2=a+b*T2+c*T2 2；
Above-mentioned two formula is subtracted each other, is obtained:
Δ U=U1-U2=(T1-T2)[b+c(T1+T2)]；
Indicate the voltage variety because of caused by temperature change.Then release temperature-compensating equation are as follows: UIt mends=UIt is realΔ U=UIt is real-
(TIt is real-T0)[b+c(TIt is real+T0)]；Wherein, wherein UIt mendsFor compensated voltage value, UIt is realFor real-time collected voltage value, TIt is realFor reality
When temperature value, T0For the temperature value of initial time；According to real-time voltage value UIt is real, temperature value TIt is realAnd the temperature of initial time
T0, voltage U after calculating real-time temperature-compensatingIt mends, b and c are temperature compensation coefficients related with metal material, wherein for
The temperature acquisition of detectable substance is realized by arranging temperature sensor network on the test object, is believed physics by sensor
Number electric signal is converted into realize real-time acquisition.
S5: temperature-compensating calculates.
The voltage value acquired in real time is compensated using the temperature-compensating equation being derived by S4, according to real-time voltage
Value UIt is real, temperature value TIt is realAnd the temperature T of initial time0, voltage U after calculating real-time temperature-compensatingIt mends.The above calculating process
Principle are as follows: with the temperature value T of initial time0As benchmark, compensation voltage variety because of caused by temperature change；And due to
The raising of temperature will lead to voltage and become larger, therefore, using real-time voltage measuring value UIt is realSubtract the electricity due to caused by temperature change
Press variable quantity to get to the voltage value after compensating approach.In the present embodiment, temperature-compensating equation that Q235 steel is fitted
Are as follows:
UIt mends=UIt is real-(TIt is real-T0)[5.5977*10-9+1.02997*10-9(TIt is real+T0)]。
Since the type of metal is different, the nature difference of metal is larger.As the further improvement of temperature-compensation method, it is
The voltage temperature compensation that can be realized not same metal, establishes temperature compensation data library, stores respectively by metal material category
The temperature-compensating equation of every kind of metal material.Database process is as shown in Figure 3.Establish different metal material emulation moulds
Type carries out the derivation of temperature-compensating equation respectively；It is stored in temperature compensation data library, when the temperature for needing to apply certain metal
When compensation model, called directly from temperature compensation data library.
Based on this, in order to realize the function of temperature-compensating, temperature compensation unit includes:
It compensates equation storage unit: compensating equation, the temperature-compensating equation by metal species storage temperature are as follows:
UIt mends=UIt is realΔ U=UIt is real-(TIt is real-T0)[b+c(TIt is real+T0)]；
Wherein UIt mendsFor compensated voltage value, UIt is realFor real-time collected voltage value, TIt is realFor real-time temperature value, T0It is first
The temperature value at moment beginning；According to real-time voltage value UIt is real, temperature value TIt is realAnd the temperature T of initial time0, calculate real-time temperature
Compensated voltage UIt mends, b and c are temperature compensation coefficients related with metal material；According to real-time voltage value UIt is real, temperature value TIt is real,
And the temperature T of initial time0, voltage U after calculating real-time temperature-compensatingIt mends；
Compensation calculation unit: for calling temperature-compensating equation, the primary data storage of compensation equation storage unit storage
The temperature value T of the initial time of unit storage0And implement the real-time voltage data and temperature data of data storage cell storage,
Compensate voltage UIt mendsCalculating.
Based on above-mentioned electric field fingerprint detection system, the real-time detection of measured object may be implemented.When being detected, it will test and be
The lacing film of system is hung on measured object, and lacing film and measured object are in same working environment.Since lacing film and measured object use phase
With or similar material, lacing film is corroded situation with measured object in same working environment will be to approximate.Therefore, by real-time
Voltage, the electric current of lacing film are acquired, combining environmental parameter can reflect the situation that is corroded of lacing film.Once and lacing film is corroded, quilt
Surveying object equally can also be corroded.The current output terminal positive and negative anodes of PXIe-4112 are separately connected on the electrode at lacing film both ends to be measured,
The column channel C of PXI-25350~C(n-1)(quantity that n is acquisition electrode) is separately connected each of acquisition matrix acquisition electricity
Pole.When measurement, by two row of channels R of PXI-25350And R1Two current potentials for being connected to precision digital multimeter PXIe-4081 are defeated
Enter and measured in measurement end, the low potential measurement end of current potential input is connected to the power cathode of PXIe-4112.PXIe-4357,
PXIe-4309 connects corresponding sensor with PXIe-4303, and sensor probe is fixed on lacing film to be measured respectively.It obtains
When taking voltage data, switching acquisition matrix connects switch, to control the potential difference between multimeter acquisition Different electrodes.
Hereinafter, will be described the method for carrying out tested analyte detection using detection system of the invention.
Electric field fingerprint detection method realizes that overview is said, detection method passes through using above-mentioned modularization detection system
The data of original state are acquired and are saved as initial data (correlation data)；Then, real-time continuous acquisition data, to data
It after being pre-processed, judges whether to sweep again, then by all data storages and the algorithm by writing of acquiring (based on data
Excavation and pattern-recognition) it analyzes and is compared with initial data；Finally, judge based on the analysis results corrosion condition instantly and
Corrosion type, and judge whether to need early warning.Specifically includes the following steps:
SS1: test initialization.
Lacing film is placed in working environment same as measured object, according to the testing requirement of user respectively to multimeter, matrix
The switch acquisition channel of matrix switch (initialization), temperature collecting module and each corrosive environment parameter sensors matrix and outer
Portion's constant-current source carries out Initialize installation, then opens external constant-current source and is powered to lacing film to be measured.
SS2: data acquisition.
Data collection system collection voltages acquisition electrode matrix voltage value, current value, temperature value and environmental parameter.
Specifically, the voltage value of multichannel voltage acquisition matrix collection voltages acquisition electrode matrix, the voltage value packet
Initial voltage value and real-time voltage value are included, is stored in primary data storage unit and real-time data memory unit respectively.
The voltage value of matrix switch collection voltages acquisition electrode matrix, the voltage value include initial voltage value and real-time electricity
Pressure value is stored in respectively in primary data storage unit and real-time data memory unit.It is turned on by switching acquisition matrix
It closes, to control the potential difference between multimeter acquisition Different electrodes, preliminary examination data storage cell and real-time data memory unit are pressed
The specific location of electrode carrys out the potential difference between storage electrode.For example, each acquisition electrode can be numbered, Huo Zhegen
According to the number switched in matrix switch, to store the potential difference between two electrodes or between two switches.
The ambient temperature value of temperature sensor collection voltages acquisition electrode matrix work, the temperature value includes initial temperature
Value and real-time temperature values, are stored in respectively in primary data storage unit and real-time data memory unit.
Corrosive environment parameter sensors matrix acquisition environmental parameter index, including salinity, humidity, pH value etc. equally include
Primary data and real time data are stored in respectively in primary data storage unit and real-time data memory unit.
Above data is shown and is drawn a diagram two ways imaging by numerical value in upper PC machine or the people of remote server
On machine interface, and the secondary measurement data is automatically saved by testing time and electrode (matrix switch number).
SS3: Corrosion monitoring result is generated.
If it is to be measured by corrosion, it is this corrosion will react in the variation of voltage, for example, over time by
Surveying part can corrode, then is detected part being thinned with wall thickness, and resistance will increase (can obtain according to resistance formula), in this way
The collected voltage value of institute also increases with it, and according to the variation of voltage value, we judge the concrete condition of corrosion.Current density
And voltage equipotentiality slice map is as shown in Figure 8.
If real-time voltage value changes relative to initial voltage value, judge that measured object is damaged.According to becoming
The position of the real-time voltage value of change and the electrode on the corresponding voltage acquisition electrode matrix of initial voltage, to map damage
Size and position.
Specifically, in detection process, direct current is passed to lacing film, the small electric formed by measurement detection zone surface
Potential difference, corrosion will lead to lacing film resistance and change, and then field distribution is caused to change.To detect point of electric field
Cloth.
Lasting is measured in real time lacing film, by collected real-time potential data and initial potential comparing and originally
Ground storage, just sweeping (the first time scanning once integrally recycled, acquisition data are successively scanned along current direction), judgement is afterwards
It is no local corrosion occur, continue to repeat just to sweep if there is not local corrosion；If initial voltage value and real-time voltage value
There is difference, then judge existing local corrosion, then swept again, position and the calculating of local corrosion are preferably captured by sweeping again
The size of local corrosion is analyzed and researched the corruption of different corrosion conditions with carrying out corrosion control or safe early warning finally by data
Lose mechanism.
For the size of corrosion default, shape and the positioning of position, can in conjunction with the position of electrical machine matrix top electrode and it is true
It is fixed.
As a further preference, it is contemplated that influence of the temperature to resistance further carries out temperature-compensating to collection voltages,
Variation according to real-time voltage offset relative to initial voltage value, judges whether measured object is corroded.
Specifically, the ambient temperature value of the further collection voltages acquisition electrode matrix work of data collection system, it is described
Ambient temperature value includes original ambient temperature value and real time environment temperature value, according to temperature-compensating equation calculation offset voltage:
UIt mends=UIt is realΔ U=UIt is real-(TIt is real-T0)[b+c(TIt is real+T0)]；
Wherein UIt mendsFor compensated voltage value, UIt is realFor real-time collected voltage value, TIt is realFor real-time temperature value, T0It is first
The temperature value at moment beginning；B and c is temperature compensation coefficient related with metal material；According to real-time voltage value UIt is real, temperature value TIt is real,
And the temperature T of initial time0, voltage U after calculating real-time temperature-compensatingIt mendsIf real-time voltage offset is relative to initial
Voltage value changes, then judges that measured object is corroded.
It, can be according to the institute of changed real-time compensation voltage value and initial voltage for the detection method of temperature-compensating
The position of electrode on corresponding voltage acquisition electrode matrix, to map size and the position of corrosion.
Using the detection method of voltage temperature compensation method, the dynamic data of more accurate detection process can be fed back.
Voltage temperature compensation method compensates and corrects collected voltage value；According to revised voltage value and initial voltage value into
Row compares, to judge whether object to be detected is corroded.And after revised offset voltage can more accurately approach corrosion
The true value of collection voltages, can effectively improve detection accuracy.
Wherein environmental parameter detects, can be according to real-time corrosion data (acquisition of all data can all have the corresponding time)
It is analyzed, and studies its corrosion mechanism, the influence to different environmental parameters to corrosion carries out further investigated, and enriched environment
Corrode big data.
Further, acquisition data can upload to remote server, and remote server, which can be collected simultaneously in network, to be divided
Database is written in the collected potential data of multiple controllers and environmental data of different zones in cloth, and carries out big data point
Analysis, accomplishes multisystem comprehensive detection.
The advantages of present invention incorporates hanging slice method and electric field fingerprint methods, is effectively combined two kinds of detection methods.
Due to using the compensation method based on temperature-compensating equation, do not influenced by external hardware installation, therefore mentioned using the present invention
The detection system and detection method of the electric field fingerprint combination lacing film of confession carry out real-time, on-line checking, not by site environment complexity
Influence, error is small, and safety is good, can effectively improve Corrosion monitoring precision.
Claims (7)
1. the modularization electric field fingerprint detection system based on lacing film, it is characterised in that: including being mountable in tested corrosive environment
Lacing film, be provided with current fed electrode on the lacing film and electric current feed out electrode, voltage acquisition electrode matrix and temperature sensing
Device；It further comprise data processing module and data collection system, the data collection system includes high speed matrix switch module
And multimeter module, the input terminal of high speed matrix switch module are connect with each electrode of voltage acquisition electrode matrix respectively,
Output end is connect with multimeter module, and the data of data collection system acquisition are transferred to data processing module.
2. modularization electric field fingerprint detection system as described in claim 1, it is characterised in that: the data collection system is into one
Step includes power module, and the output end of power supply feeds out electrode with the current fed electrode at the lacing film both ends and electric current and connect.
3. modularization electric field fingerprint detection system as claimed in claim 2, it is characterised in that: the data collection system is into one
Step includes multichannel temperature acquisition module, and the multichannel temperature acquisition module is connect with the temperature sensor on lacing film.
4. modularization electric field fingerprint detection system as claimed in claim 3, it is characterised in that: the modularization electric field fingerprint inspection
Examining system further comprises corrosive environment parameter sensors matrix, and the data collection system further comprises that multichannel voltage is adopted
Collect module and multi channel currents acquisition module, corrosive environment parameter sensors matrix include environment temperature sensor, humidity sensor
Device, air velocity transducer, salinity sensor, pressure sensor, oxidation-reduction potential sensor, acidity-basicity sensor, dissolved oxygen pass
Sensor, flow sensor；Voltage-type environmental parameter sensor is connect with multichannel voltage acquisition module, and current mode environmental parameter passes
Sensor is connect with multi channel currents acquisition module, and environment temperature sensor is connect with multichannel temperature acquisition module.
5. the modularization electric field fingerprint detection system based on lacing film as claimed in claim 4, it is characterised in that: at the data
It manages module and uses PXIe processor；The power module uses PXIe programmable power supply module；The high speed matrix switch module
Using PXI high speed matrix switch module；The multimeter uses PXIe digital multimeter module；The temperature collecting module uses
PXIe temperature collecting module；The multichannel voltage acquisition module uses PXIe voltage acquisition module；The multi channel currents are adopted
Collect module and uses PXIe current acquisition module；The PXIe processor, PXIe programmable power supply module, PXI high speed matrix switch
Module, PXIe digital multimeter module, PXIe temperature collecting module, PXIe analog voltage acquisition module, PXIe analog current are adopted
Collection module is integrated in PXIe cabinet.
6. the modularization electric field fingerprint detection system based on lacing film as claimed in claim 4, it is characterised in that: the corrosion ring
The probe of border parameter sensors and the lacing film are installed on side by side in same corrosive environment.
7. the modularization electric field fingerprint detection system based on lacing film as described in claim 1, it is characterised in that: the lacing film
Material is identical as the material of monitored target.
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| CN115110083A (en) * | 2022-05-27 | 2022-09-27 | 国家石油天然气管网集团有限公司 | Long-distance pipeline instantaneous corrosion rate testing device based on cathodic protection |
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| CN115110083A (en) * | 2022-05-27 | 2022-09-27 | 国家石油天然气管网集团有限公司 | Long-distance pipeline instantaneous corrosion rate testing device based on cathodic protection |
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