CN209727850U - A kind of portable metallic material detector based on impulse eddy current - Google Patents
A kind of portable metallic material detector based on impulse eddy current Download PDFInfo
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- CN209727850U CN209727850U CN201920148460.7U CN201920148460U CN209727850U CN 209727850 U CN209727850 U CN 209727850U CN 201920148460 U CN201920148460 U CN 201920148460U CN 209727850 U CN209727850 U CN 209727850U
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- signal
- eddy current
- conditioning circuit
- data collecting
- signal conditioning
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Abstract
The utility model discloses a kind of portable metallic material detector based on impulse eddy current, its composition includes: sensor probe (1), signal conditioning circuit (2), data collecting card (3), portable computer (4).Sensor probe (1) is connected with signal conditioning circuit (2), signal conditioning circuit (2) is connected with data collecting card (3), data collecting card (3) is connected with portable computer (4), operates entire detector by the Interface of Virtual Instruments generated on the screen of portable computer (4).Sensor probe (1) composition includes: excitation coil, Hall sensor, magnetic core.Pulsed eddy current testing technology has the advantages that non-contact type detection and surface without clearing up；The detection to defect under different location different depth in multi-layer metal structure may be implemented；The exploitation and use cost of measuring instrument are reduced using system based on virtual instrument structure, it is easy to carry.
Description
Technical field
The utility model belongs to electromagnetic nondestructive testing field, examines more particularly, to the impulse eddy current of metal material detection
Examining system.
Background technique
One of basic technology as modern industry, non-destructive testing play more and more on guaranteeing product and construction quality
The good reputation of important role, " quality bodyguard " has obtained the generally approval of industry.
There are five big conventional methods in non-destructive testing technology at present, is Ultrasonic Nondestructive, ray, magnetic powder, liquid respectively
Infiltration and EDDY CURRENT.Wherein eddy detection technology provides a kind of unique and low cost extensive detection method of high speed,
Through in such as nuclear energy, aerospace, ocean, high pressure, High Temperature And Velocity engineering system and automobile, engine, machine components, day
It is widely used in the relevant detection such as the conductive material of articles, becomes the organic whole of many industrial productions and maintenance
A part.
According to statistics, in modern whole non-destructive testing work, that is completed using eddy detection technology is accounted for about.In EDDY CURRENT
In, conventional method is the variation of measuring coil impedance, since coil impedance is the concentrated reflection of defect information, cannot be disclosed specific
Details is unable to satisfy the requirement of development of modern industry, although and traditional eddy detection technology be suitable for cracks of metal surface
Detection, but between multi-layer metal structure middle layer or deeper inside occur defect just seem helpless.
Utility model content
For defect existing for above-mentioned traditional eddy detection technology, the utility model proposes applied in addition based on impulse eddy current
Virtual instrument technology realizes a kind of portable metallic material detector based on impulse eddy current.
The technical solution of the utility model includes:
A kind of portable metallic material detector based on impulse eddy current, its composition include: sensor probe 1, signal
Conditioning circuit 2, data collecting card 3, portable computer 4.Sensor probe 1 is connected with signal conditioning circuit 2, signal condition electricity
Road 2 is connected with data collecting card 3, and data collecting card 3 is connected with portable computer 4, leads on the screen of portable computer 4
It crosses the Interface of Virtual Instruments generated and operates entire detector.
The composition of sensor probe 1 includes: excitation coil, Hall sensor, magnetic core.
The composition of signal conditioning circuit 2 includes: signal generator, power amplifier and signal amplification circuit.
The INA129 instrumentation amplifier that the signal amplification circuit is selected is core chips, with a slide rheostat come
The high-pass filtering circuit of the gain of change amplifying circuit, capacitor and resistance, composition is primarily used to filter out the direct current in signal point
Amount.
The technical effect of the utility model:
Pulsed eddy current testing technology belongs to electromagnetic detection range, with non-contact type detection and surface without the excellent of cleaning
Point；It includes from direct current to even higher frequency component, so only needing single pass can that pulse, which has spectral content abundant,
To realize the detection to defect under different location different depth in multi-layer metal structure；The complicated multilayer knot changed for thickness
The large-area scanning of structure, distinguishable structure change and defect parameters change the influence to signal, without replacing probe or changing
Parameter is set.The exploitation and use cost of measuring instrument are reduced using system based on virtual instrument structure, it is easy to carry.
Detailed description of the invention
Fig. 1 is portable metallic material detector composition figure.
Fig. 2 is sensor probe configuration figure.
Fig. 3 is signal amplification circuit figure.
In figure: 1 is sensor probe, and 2 be Sensor interface apparatus, and 3 be data acquisition card, and 4 be portable computer.
Specific embodiment
With reference to the accompanying drawings and detailed description, the utility model is described further.
1. the overall structure of portable instrument
A kind of portable metallic material detector based on impulse eddy current, its composition include: sensor probe 1, signal
Conditioning circuit 2, data collecting card 3, portable computer 4.Sensor probe 1 is connected with signal conditioning circuit 2, signal condition electricity
Road 2 is connected with data collecting card 3, and data collecting card 3 is connected with portable computer 4, leads on the screen of portable computer 4
It crosses the Interface of Virtual Instruments generated and operates entire detector.As shown in Figure 1.
The composition of sensor probe 1 includes: excitation coil, Hall sensor, magnetic core.As shown in Figure 2.
The composition of signal conditioning circuit 2 includes: signal generator, power amplifier and signal amplification circuit.
The INA129 instrumentation amplifier that the signal amplification circuit is selected is core chips, with a slide rheostat come
Change the gain of amplifying circuit, capacitor C5With resistance R1、R2The high-pass filtering circuit of composition is primarily used to filter out straight in signal
Flow component.As shown in Figure 3.
2. sensor probe
Sensor probe major part composition, i.e. excitation coil, Magnetic Sensor, magnetic core, are illustrated in figure 2 sensor probe
Structural schematic diagram.Wherein, excitation coil is used to generate the magnetic field of pulse change, to generate transition in metallic conduction test specimen
Vortex；Magnetic Sensor is then used to measure the vertical component of magnetic field strength at tested conductive surface of test piece, which is former add
The Vector modulation in magnetic field and both vortex Induced magnetic fields；Skeleton is that support is provided for the excitation coil wound, and magnetic core is then magnetic
The line of force provides access, so as to play the role of enhancing and aggregation magnetic field；Probing shell is then to protection and one of having popped one's head in
Fixed shielding action.
The design quality of excitation coil also directly affects the size of sensor probe sensitivity.There are several main parameters
It is required that being considered, they are the number of turns of the line footpath of enameled wire, the internal diameter of coil, outer diameter and height and coil.
The optimal value of these parameters can be accurately determined currently without accurate analysis method, but can be according to line
The analysis of parameters simulation result is enclosed, determine these parameters follows following several principles: the internal diameter of coil is smaller, around coil
The distribution in magnetic field is more concentrated, and the raising of detection system resolution ratio is conducive to；The outer diameter of coil is bigger, generates in conductive test specimen
Vortex intensity it is bigger, be conducive to the raising of detection system sensitivity；The height of coil is smaller, and the magnetic field around coil more collects
In, the vortex intensity induced in test specimen is also bigger, thus lesser coil height can both increase the resolution of system detection
Rate, and be conducive to improve the sensitivity of detection；Magnetic core is added in coil, the magnetic field that can greatly reinforce around coil is strong
Degree, so that the volume of coil reduces, can also reduce the power on excitation coil；The line footpath of enameled wire is thicker, line
The impedance of circle is smaller, is conducive to reduce the Joule heat generated in hot-wire coil, but slightly again the number of turns of coil is reduced excessively, from
And the magnetic field strength for causing coil to generate dies down.
Thus, in the selection to enameled wire, it is necessary to comprehensively consider between line footpath and coil turn the two factors
Relationship.Using Hall effect, the measurement of many physical quantitys may be implemented, such as may determine that the conduction type of material, carrier are dense
The major parameters such as degree, carrier mobility.Using sensor made of Hall effect, can also realize to electric current, voltage, position
And the measurement of many physical quantitys such as magnetic field strength.Select Hall sensor as experiment used in Magnetic Sensor be mainly
Since the range of its measurement magnetic field strength is greatly and without excellent characteristics such as hysteresis effects, but it also has sensitivity lower and frequency is rung
Answer the disadvantage that range is relatively narrow.
3. signal amplification circuit
Due to use sensor export be small voltage signal, it is necessary to processing is amplified to this tiny signal
Afterwards, to be suitble to the input range of data collecting card, so that the signal-to-noise ratio of sampled signal improves as far as possible.
In this secondary design, the INA129 instrumentation amplifier that amplifying circuit is selected is core chips.
INA129 is the general purpose instrument amplifier of a low power consumption high-precision.It has the following characteristics that
Easy to use, only need to access a resistance can change amplification factor；Amplification range is big, can be up to 100 times；
High cmrr (CMR), it is minimum up to 120dB；It is suitble to the higher occasion of required precision.
Signal amplification circuit as shown in figure 3, selected the slide rheostat of a high stability 50K to put to change here
The gain of big circuit.The high-pass filtering circuit of capacitor C5 and resistance R1, R2 composition is primarily used to filter out the direct current in signal point
Amount.
4. virtual instrument
The virtual instrument software module for being built in portable electric intracerebral is part system software by computer, tool software
It is formed with the medical application software three parts for aiming at virtual organism medical measurement Instrument Design.Major function is realized to entire
Effective management of instrument, especially biomedicine signals processing analysis, storage, display, printing etc. functions.It finally provides friendly
Human-computer interaction interface；Realize more more convenient than common special bio medical measurement instrument, quick, reliable operation；And figure
Change as the result is shown with automation function of statistic analysis etc..
Virtual organism medical measurement instrument hardware Interface design is substantially the design of computer-oriented bus, it is therefore necessary to
Follow the standard of computer system bus.
One is PCMCIA (the Personal Computer Memory Card for being exclusively used in laptop
International Association) bus, suitable for the Biomedical Instruments design under mobile environment.
LabVIEW is the virtual instrument system software using graphical programming that NI company, the U.S. develops, it mainly includes number
The functions such as show according to acquisition, real-time control, data analysis and data, it provides the new programming language of one kind: G language, this is
A kind of complete brand-new method that software modularity design is carried out using graphics mode.
LabVIEW is made of front panel, flow diagram and icon/connector.Wherein front panel is user interface, process
Block diagram is virtual instrument source code, and icon/connector is calling interface.The program language of LabVIEW is graphical, program
Using data flow driven.
The core of LabVIEW is software module VI (borrowing the name of Virtual Instrumentation abbreviation prefix), VI
There is user interface-front panel (front panel) of personal-machine dialogue and similar to the block diagram in terms of source code function
(diagram).Front panel receives the order from block diagram.In the front panel of VI, control (controls) simulation input instrument
The input unit of device and the block diagram for providing data to VI；And indicator (indicators) then simulates the output dress of instrument
It sets and shows the data for being obtained by block diagram or being generated.
When working out block diagram program with LabVIEW, it is not necessary to be limited by conventional program design syntax details.Firstly, from function
The function box needed is selected in menu, it is placed in the appropriate location on panel；Then each function is connected with conducting wire (wires)
The port of box in a block diagram, for transmitting data between function box.These boxes include simple arithmetic function, high
The acquisition of grade and analysis VI and realization are used to store and retrieve data file input/output function and network function.
With LabVIEW compile graphical VI be by different level with it is modular.It is used for top-level procedure.It is also used as
The subprogram of other programs or subprogram.One VI is used in other VI, and referred to as subVI, subVI are calling its program
In be equally with the appearance of an icon.LabVIEW is depended on and has been developed the concept of modeled programming.User can be
One application topic decomposes for a series of subtask, and each subtask can also further decompose into many lower level-one
The combination of task, the combination until a complicated topic being decomposed into many subtasks.
GRAPHICAL PROGRAMMING programming is simple, intuitive, development efficiency is high.With the continuous development of virtual instrument technology, figure
The programming language of shape will become most popular development trend in test and control field.The process of creation virtual instrument is divided into
Three steps:
(1) interactive user interface of virtual instrument is referred to as front panel, because it has imitated the panel of actual instrumentation.Before
Panel includes knob, button, figure and other controls and display object.By mouse and keyboard input data, control button,
It can view result on the computer screen.
(2) virtual instrument receives order (being created with G language) from flow chart.Flow chart is the figure of a programming problem
Change solution.Flow chart is also the source code of virtual instrument.
The icon of (3) virtual instruments and connection are just as the parameter list of a figure (indicating a certain virtual instrument).
In this way, other virtual instruments can just transfer data to a sub- instrument.Icon and connection allow using this instrument as highest
The program of grade, can also be used as the subprogram (sub- instrument) in other programs or subprogram.
5. data acquire the design of (DAQ) card
The composition of 5.1 DAQ
The I/O interface of virtual instrument hardware platform is known as DAQ (Data Acquisition) card.In general, so energy
It is enough that data acquisition and the board of control task can be known as DAQ card under the control of the computer.DAQ card mainly has following several
A part composition:
(1) variable connector.Each road signal is switched to the input terminal of amplifier in turn, to realize multi-parameter multiple signals
Acquisition time.
(2) amplifier.The signal to be collected amplification (or decaying) that previous stage variable connector is switched into, until using ring
In the range ability of section.The amplifier of adjustable gain is made by amplifier in real system, designer can be according to input signal
Different amplitudes selects different gain factors.
(3) sample/hold circuit.Take out measured signal a certain instantaneous value (realizing the time discretization of signal) simultaneously
Keep signal constant in A/D conversion process.If measured signal variation is slowly, sampling holder can also not had to.
(4) A/D conversion circuit.The analog signal of input is converted to data output by A/D conversion circuit.It is DAQ hardware
Core.There are three types of methods for A/D conversion: successive approximation method, double integration method and parallel comparison method.In DAQ using preferably at most by
Secondary approximatioss.Measuring A/D conversion performance, mainly there are two indexs: sampling resolution, i.e. A/D converter digit, second is that A/D is converted
Digit, second is that A/D conversion speed.
(5) D/A is converted.DAQ system is frequently necessary to provide pumping signal for measurand, that is, output analog quantity letter
Number.D/A conversion is the device that digital quantity signal is converted to analog output.The Specifeca tion speeification of D/A converter is to differentiate
Rate and linearity error, resolution ratio depend on that the digit of D/A converter, linearity error then feature the precision of D/A converter.
(6) Timer/Counter.There are one important devices in DQA card, are exactly Timer/Counter.It is mainly used for arteries and veins
Rush periodic signal measurement, precise time control and pulse signal generation etc..Periodically/calculator main performance index is resolution ratio
And clock frequency, resolution ratio is bigger, and calculator digit is bigger, and count value is higher.
(7) number I/O.DAQ is established logical with external equipment using the working condition of number I/O acquisition external equipment
Letter.General number I/O uses Transistor-Transistor Logic level.
The parameter setting of 5.2 DAQ
Make data collecting card, correctly realize data acquisition function, must just be needed according to actual measurement to DAQ's
Parameter is correctly arranged, and here it is the software-driven problems of data collecting card.All kinds of DAQ of NI company production are examined,
LabVIEW both provides special driver and test setting software MAX (Measurement&Automation), and MAX can
To detect the equipment connected with computer automatically and corresponding setting software can be called to be configured device parameter.Main device ginseng
Number includes:
(1) analog signal inputs
1) input mode of setting signal clicks signal and bipolar signal etc. such as single ended input and double-width grinding；
2) gain selects, and selects gain according to the amplitude range of input signal and resolution requirement；
3) measurement range selection selects range appropriate according to the polarity of input signal.
(2) A/D is converted
1) setting signal input channel；
2) setting is using points；
3) sampling rate is set；
4) way of output for setting sampled result, is that result is placed in array, is also placed in a certain buffer area；
5) setting sampling triggering mode, including the triggering of external trigger, clocked flip, software etc.；
(3) D/A is converted
1) output channel of analog signal；
2) output amplitude of analog signal；
3) refresh rate, refresh rate determine " smoothness " of generated analog signal waveform, most fast refresh rate
Inverse is the response time.
Claims (3)
1. a kind of portable metallic material detector based on impulse eddy current, its composition includes: sensor probe (1), signal
Conditioning circuit (2), data collecting card (3), portable computer (4), sensor probe (1) are connected with signal conditioning circuit (2),
Signal conditioning circuit (2) is connected with data collecting card (3), and data collecting card (3) is connected with portable computer (4), just
It takes and entire detector is operated by the Interface of Virtual Instruments generated on the screen of formula computer (4), it is characterised in that: the sensing
Device probe (1) composition includes: excitation coil, Hall sensor, magnetic core.
2. a kind of portable metallic material detector based on impulse eddy current according to claim 1, it is characterised in that: institute
Signal conditioning circuit (2) composition stated includes: signal generator, power amplifier and signal amplification circuit.
3. a kind of portable metallic material detector based on impulse eddy current according to claim 2, it is characterised in that: institute
The INA129 instrumentation amplifier that the signal amplification circuit stated is selected is core chips, changes amplification electricity with a slide rheostat
The gain on road, capacitor and resistance, composition high-pass filtering circuit be primarily used to filter out the DC component in signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920148460.7U CN209727850U (en) | 2019-01-28 | 2019-01-28 | A kind of portable metallic material detector based on impulse eddy current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920148460.7U CN209727850U (en) | 2019-01-28 | 2019-01-28 | A kind of portable metallic material detector based on impulse eddy current |
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| Publication Number | Publication Date |
|---|---|
| CN209727850U true CN209727850U (en) | 2019-12-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920148460.7U Expired - Fee Related CN209727850U (en) | 2019-01-28 | 2019-01-28 | A kind of portable metallic material detector based on impulse eddy current |
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| Country | Link |
|---|---|
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2019
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191203 Termination date: 20210128 |
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| CF01 | Termination of patent right due to non-payment of annual fee |