CN204255904U - Based on the Pulsed Eddy Current Testing System of rectangle difference detector - Google Patents
Based on the Pulsed Eddy Current Testing System of rectangle difference detector Download PDFInfo
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- CN204255904U CN204255904U CN201420645878.6U CN201420645878U CN204255904U CN 204255904 U CN204255904 U CN 204255904U CN 201420645878 U CN201420645878 U CN 201420645878U CN 204255904 U CN204255904 U CN 204255904U
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Abstract
The utility model provides a kind of based on rectangle difference detector pulsed eddy-current nondestructive test system, mainly includes the rectangle Differential Detection probe of square-wave generator, power amplifier, Hall element, low-pass filter, Signal-regulated kinase, signal acquisition module and autonomous Design.Gained signal waveform shows by experiment, and this probe effectively can improve the sensitivity of nonferromagnetic component and ferromagnetic component defects detection.
Description
Technical field: the utility model is by loading the detection to iron plate and aluminium sheet of driving pulse electric current to rectangle difference detector, made some to the pulse eddy current probe of routine and sensor and improved, this utility model relate to Non-Destructive Testing and technical field of measurement and test.
Background technology: along with the fast development of world industry, pipeline has a wide range of applications in every field such as petrochemical complex, colliery industry, oceanographic engineerings, has become indispensable part in modern industry.But along with the active time of pipeline is more and more longer, pipeline can have certain potential safety hazard, and the principal element occurred is corrosive pipeline and wearing and tearing.Therefore, the burn into abrasion condition of testing pipes and evaluate reliability and the serviceable life of piping system is one of important means avoiding pipeline accident to occur.The detection method of pipeline is generally being had to ray, ultrasonic, the detection technique such as leakage field and EDDY CURRENT; But ultrasonicly needing couplant, ray needs radioactive source, needs magnetic saturation device during Magnetic Flux Leakage Inspecting, and these all limit the development of detection technique in pipe detection in a way.Impulse eddy current is as a kind of novel detection technique, because it has very wide frequency spectrum, only need single pass just can analyze the defect of test specimen different depth, have penetration depth strong, comprise the features such as abundant information, therefore to the detection of the ferromagnetic components such as pipeline, there is certain advantage.
Utility model content: this utility model is mainly for the plain cylindrical form detection probe impulse eddy current problem that Detection results is not good in ferromagnetic component, signal is undesirable, a kind of Pulsed Eddy Current Testing System based on rectangle difference detector of design, this probe effectively can not only improve the sensitivity of ferromagnetic component detection signal, and has good Detection results equally to nonferromagnetic component.
Based on a Pulsed Eddy Current Testing System for rectangle difference detector, mainly comprise following aspect:
(1) experiment porch of detection is built, hough transform probe is lain in a horizontal plane in directly over test specimen, lift-off is 1mm, the driver unit of detection probe is connected through the pulse signal of amplification, and two Hall elements are connected follow-up signal conditioning circuit.
(2) in order to obtain good Detection results, rectangle differential type probe is devised;
(3) a kind of new probe placement mode is taken;
(4) design corresponding signal to occur and modulate circuit;
(5) oscillograph and computing machine simultaneous display signal.
Described rectangle difference detector modes of emplacement is as follows: probe lies in a horizontal plane in directly over test specimen, and the central axis of probe and test specimen axis keeping parallelism, lift-off value is 1mm.
The step that described detection system detects defect is as follows: when rectangle difference detector is placed on fault location, fault location current vortex generation disturbance, and then cause the change of the secondary magnetic field of inducting, and sensor measured signal is Primary field and the secondary magnetic field superposition of exciting field; Hall element can catch this change, and magnetic field value is converted into the form of magnitude of voltage, through process such as follow-up amplification, filtering, denoisings, is input to computing machine is carried out follow-up process by oscilloscope display signal by data collecting card.
Technical characteristics of the present utility model has:
(1) design of the present utility model is hough transform probe, and be different from conventional cylindrical probe, this probe can produce the good eddy current of directivity and magnetic field intensity, is conducive to the detection of defect.
(2) the utility model be employing two Hall elements to the technology of signal direct differential, two Hall elements are symmetrically distributed in detection probe two ends, respectively detect have, zero defect signal.
(3) detection probe of the present utility model takes a kind of new modes of emplacement, and probe is horizontal positioned formula, the central axis of probe and test specimen axis keeping parallelism, and is positioned over directly over defect.
(4) create a kind of new eddy current direction of propagation, in the past probe adopt be vertical placement, generation be from
(5) eddy current of surface of test piece constantly decay to sub-surface, and the probe placement mode that the utility model is taked produces is the eddy current of being decayed to test specimen two ends along its axis by detection.
(6) detection signal that simultaneous display rectangle Differential Detection is popped one's head in and conventional transducer exports, and they are analyzed and contrasts.
Accompanying drawing illustrates: Fig. 1 rectangle difference detector detection system process flow diagram.
Fig. 2 Hall element schematic diagram in the pcb.
The magnetic line of force distribution plan of Fig. 3 test specimen internal vortex.
Fig. 4 is square wave circuit for generating.
Fig. 5 power amplification circuit.
Fig. 6 is low-pass filter circuit.
Fig. 7 is signal conditioning circuit.
Fig. 8 is iron plate defect detection signal waveform.
Fig. 9 is the detection signal waveform of aluminium sheet defect.
Embodiment:
Below in conjunction with accompanying drawing, embodiment of the present utility model is further described.
First, experiment porch is as shown in Figure 1 built.The suitable voltage of direct supply is regulated to be input to square wave circuit for generating, produce the square wave of frequency-adjustable, by power amplifier, faint signal is amplified, the signal after amplification enters the drive coil of institute's coiling on rectangle difference detector, and drive coil itself can produce Primary field; When rectangle difference detector 1 lies in a horizontal plane on test specimen 2, the secondary magnetic field that test specimen internal vortex produces and Primary field are coupled, and when running into defect 3, vortex density and distribution change, and then there is disturbance in the magnetic field of coupling, this variable quantity detected by Hall element; Because defect 3 can change on the magnetic line of force 7, each puts corresponding magnetic induction density value to test specimen internal vortex, wherein directly over defect, 9 place's changes of magnetic field are the most obvious, and magnetic field value near zero defect place is almost constant, detect magnetic field when to locate 9 directly over zero defect place 8 and defect respectively by the Hall element 5,6 being placed in pcb board 4 both sides; This detection signal can produce higher signal amplitude relative to conventional sense, because the vertically magnetic direction at 8 places and 9 places is contrary, and the signal that the signal amplitude that can produce after difference detects higher than general difference detector.In order to eliminate HF noise signal, be necessary to carry out low-pass filtering treatment to it, to be eddy current medium and low frequency composition play a major role and filter away high frequency noise for the detection of defect its reason, and follow-up signal entering signal modulate circuit is nursed one's health, and the signal waveform after conditioning is presented on oscillograph.Data collecting card one end is responsible for gathering the rectangular pulse signal produced, and the other end is responsible for the signal after to conditioning and is gathered and input computer, data is introduced MATLAB and carries out treatment and analysis, carry out identification and the quantitative test of defect.
Fig. 2 is the PCB arrangenent diagram of Hall element, and Hall element is symmetrically distributed in both sides, and made PCB is arranged on the downside of rectangle difference detector.
Fig. 3 is the magnetic line of force distribution plan that test specimen internal vortex produces, and can find out the distribution having zero defect two place magnetic direction at the magnetic line of force.
The circuit of Fig. 4 is for generation of Pulse High Voltage, and the circuit of Fig. 5 amplifies it, and the circuit of Fig. 6 carries out low-pass filtering treatment to the signal detected, and the circuit of Fig. 7 does further conditioning to signal.
Fig. 8 and Fig. 9 is the defect detection signal waveform of iron plate and aluminium sheet respectively, can find out that this rectangle difference detector can be good at detecting for the defect of iron plate different depth, and different depth of defect signal distinguishing is obvious, and the Detection results for aluminium sheet is better equally.
Signal from producing to the detailed process nursed one's health is:
Native system signal generating module adopts rect.p. as driving source, forms dutycycle and all adjustable signal generating circuit of frequency, regulating resistance R as shown in Figure 4 by ICL8038 monolithic function generator and UA741 voltage follower
13the dutycycle of adjustable output square-wave signal, regulating resistance R
14the frequency of adjustable output square-wave signal, regulating resistance R
20adjustable exports the amplitude of square-wave signal.Square-wave signal selects OPA548 chip as amplification chip, and it has low-power consumption, big current, output voltage advantages of higher, and can be used for driving various load, chip integration is very high, and power amplification multiple equals 1+R
16/ R
15, by regulating variohm R
16power amplification multiple can be changed.The wave filter adopted is second order active low-pass filter, selected R
1=R
2=R, C
1=C
2=C, it is 15KHz that selected electric capacity C=1nF, resistance R=10K Ω obtains cut-off frequecy of passband according to formula f=1/2 π RC, and the noise signal composition higher than frequency 15KHz is filtered completely.Filtered signal is also very faint, need further to amplify to be easy to observe, choice for use AD620 amplification chip is as the amplifying circuit of acp chip signal condition link, this circuit has two functions, the first devises a Hi-pass filter at the input end of chip, and Main Function is the DC component that filtering circuit carries; It two is weak signal amplification circuit, and voltage amplification factor equals 1+49.4/R
4, by regulating resistance R
4size change voltage amplification factor.
Claims (6)
1., based on a Pulsed Eddy Current Testing System for rectangle difference detector, its feature comprises as lower member:
(1) structure of detection system, test specimen, is placed in detection probe above test specimen fault location, drive coil, Hall element, power amplifier, low-pass filter and data collecting card;
(2) rectangular coil probe;
(3) PCB of two Hall elements is contained;
(4) the integral type difference detector of the PCB containing Hall element and square coil;
(5) contain corresponding signal to occur and modulate circuit;
(6) when rectangle difference detector is placed on fault location, left side Hall element on PCB is just to flawless place, the right Hall element in right side is just to fault location, reference signal and flaw indication can be produced, two signals obtained are through low-pass filtering and differential amplification, obtain desirable detection signal, oscillograph and computing machine synchronously to the display of signal and analysis, process, realize identification and the quantitative test of defect.
2. a kind of Pulsed Eddy Current Testing System based on rectangle difference detector according to claim 1, it is characterized in that: the lift-off value of the maintenance 1mm of probe placement at fault location and with test specimen, the right side Hall element of detection probe lower end is just to fault location, and the corresponding zero defect place of left side Hall element.
3. a kind of Pulsed Eddy Current Testing System based on rectangle difference detector according to claim 1, it is characterized in that: the geometric configuration of probe is rectangle, pop one's head in the column type of routine in district, this probe can produce the good eddy current of directivity and magnetic field intensity, Hall element is welded on PCB, and flawless magnetic field has been detected in the left and right sides being arranged symmetrically in probe.
4. a kind of Pulsed Eddy Current Testing System based on rectangle difference detector according to claim 1, is characterized in that: the PCB level that Hall element is housed embeds in square coil probe, and both closely cooperate, and detection probe horizontal positioned carrys out scanning defect.
5. a kind of Pulsed Eddy Current Testing System based on rectangle difference detector according to claim 1, it is characterized in that: form dutycycle and all adjustable signal generating circuit of frequency by ICL8038 monolithic function generator and UA741 voltage follower, signal power amplifies selection OPA548 chip as amplification chip, the wave filter adopted is second order active low-pass filter, and choice for use AD620 amplification chip is as the amplifying circuit of acp chip signal condition link.
6. a kind of Pulsed Eddy Current Testing System based on rectangle difference detector according to claim 1, it is characterized in that: the detection signal of oscillograph simultaneous display rectangle difference detector and conventional transducer, contrast the difference of these two kinds of signals, detection signal enters computing machine by data collecting card, in MATLAB, carry out treatment and analysis.
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|---|---|---|---|
| CN201420645878.6U CN204255904U (en) | 2014-10-31 | 2014-10-31 | Based on the Pulsed Eddy Current Testing System of rectangle difference detector |
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| CN201420645878.6U CN204255904U (en) | 2014-10-31 | 2014-10-31 | Based on the Pulsed Eddy Current Testing System of rectangle difference detector |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104297338A (en) * | 2014-10-31 | 2015-01-21 | 江南大学 | Pulse eddy current detecting system based on rectangular difference probe |
| CN106596711A (en) * | 2016-10-24 | 2017-04-26 | 合肥工业大学 | Hydraulic cylinder detection system based on pulsed eddy current |
| CN108692193A (en) * | 2018-05-31 | 2018-10-23 | 中国石油化工股份有限公司 | A kind of Pulsed Eddy Current Testing System and method of small-caliber pipeline defect |
| CN113311064A (en) * | 2021-05-25 | 2021-08-27 | 国网湖南省电力有限公司 | Pulse eddy current detection method and system for lead sealing part of cable joint |
| CN113433212A (en) * | 2021-06-24 | 2021-09-24 | 西安交通大学 | Uniform field excitation directional eddy current probe with strong interference resistance and detection method |
-
2014
- 2014-10-31 CN CN201420645878.6U patent/CN204255904U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104297338A (en) * | 2014-10-31 | 2015-01-21 | 江南大学 | Pulse eddy current detecting system based on rectangular difference probe |
| CN106596711A (en) * | 2016-10-24 | 2017-04-26 | 合肥工业大学 | Hydraulic cylinder detection system based on pulsed eddy current |
| CN108692193A (en) * | 2018-05-31 | 2018-10-23 | 中国石油化工股份有限公司 | A kind of Pulsed Eddy Current Testing System and method of small-caliber pipeline defect |
| CN113311064A (en) * | 2021-05-25 | 2021-08-27 | 国网湖南省电力有限公司 | Pulse eddy current detection method and system for lead sealing part of cable joint |
| CN113433212A (en) * | 2021-06-24 | 2021-09-24 | 西安交通大学 | Uniform field excitation directional eddy current probe with strong interference resistance and detection method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150408 Termination date: 20161031 |
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| CF01 | Termination of patent right due to non-payment of annual fee |