CN104007173A - Magnetic flux leakage detection device for nondestructive detection of ferromagnetic material - Google Patents
Magnetic flux leakage detection device for nondestructive detection of ferromagnetic material Download PDFInfo
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- CN104007173A CN104007173A CN201310060878.XA CN201310060878A CN104007173A CN 104007173 A CN104007173 A CN 104007173A CN 201310060878 A CN201310060878 A CN 201310060878A CN 104007173 A CN104007173 A CN 104007173A
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Abstract
The invention discloses a magnetic flux leakage detection device for nondestructive detection of a ferromagnetic material. Specifically, in the device, a CPU control module, a synchronous signal module, a switch circuit, a power amplification module, and a magnetizing coil are connected in order. The output end of the synchronous signal module is connected to the input end of a time delay switch, the output end of which is connected to the input end of a magnetic flux leakage signal acquisition module, wherein the magnetic flux leakage signal acquisition module comprises a magnetic flux leakage sensor, a preamplifier unit, a fore-filtering unit, an A/D acquisition unit, a digital filtering unit, a defect recognition processing unit and an alarm output unit connected in order. The detection device can effectively improve the magnetic flux leakage detection resolution of the ferromagnetic material, increase signal-to-noise ratio of magnetic flux leakage detection, and find micro-defects of the ferromagnetic material, especially a thin ferromagnetic material, thus furthering improve the product quality.
Description
Technical field
The present invention relates to a kind of leakage magnetic detection device for ferrimagnet Non-Destructive Testing.
Background technology
Magnetic Flux Leakage Inspecting is a kind of important detection means in Dynamic Non-Destruction Measurement, mainly by detecting the stray field of ferrimagnet surface and near surface flaw generation, find the characteristic quantity of defect, it detects similarly to conventional magnetic in principle, and the sensor of just having taked to detect magnetic field data in the processing mode of signal has replaced the method for magnetic demonstration.
Magnetization is the first step that realizes stray field reliable detection, and the conventional mode of magnetization has two kinds of direct current and ac magnetizations.Yet the conventional mode of magnetization is difficult to meet high-precision stray field detects demand.In the test item of cold-rolled thin steel strip, product quality demand is the pore defect of ф 0.05mm, therefore needs the detection demand that a kind of unconventional detection technique meets product quality badly.
Current conventional Magnetic Flux Leakage Inspecting mainly contains two kinds of modes, and magnetic detects and sensor Magnetic Flux Leakage Inspecting.Magnetic detects and is applicable to automatically detect at a slow speed and manually detect more, and efficiency is lower, and its detectability is difficult to reach the demand of ф 0.05mm micropore.The Magnetic Flux Leakage Inspecting of utilizing sensor to implement, routine techniques can only reach the detection demand of ф 0.4mm reluctantly, and signal to noise ratio (S/N ratio) is in poor shape.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of leakage magnetic detection device for ferrimagnet Non-Destructive Testing, utilize this pick-up unit effectively to improve ferrimagnet Magnetic Flux Leakage Inspecting resolution, promote Magnetic Flux Leakage Inspecting signal to noise ratio (S/N ratio), reach the tiny flaw of finding ferrimagnet, especially thin type ferrimagnet, and then promoted product quality.
For solving the problems of the technologies described above, the present invention comprises CPU control module for the leakage magnetic detection device of ferrimagnet Non-Destructive Testing, synchronizing signal module, on-off circuit, power amplifier module, magnetizing coil, delay switch and magnetic leakage signal acquisition module, the output terminal of described CPU control module connects the input end of described synchronizing signal module, the output terminal of described synchronizing signal module connects respectively the input end of described on-off circuit and delay switch, the output terminal of described on-off circuit connects the input end of described power amplifier module, the output terminal of described power amplifier module connects the input end of described magnetizing coil, the output terminal of described delay switch connects the input end of described magnetic leakage signal acquisition module, described magnetic leakage signal acquisition module comprises leakage field sensor, pre-amplifier unit, prime filter unit, A/D collecting unit, digital filtering unit, defect recognition processing unit and warning output unit, the input end of described leakage field sensor connects the output terminal of described delay switch, the output terminal of described leakage field sensor connects the input end of described pre-amplifier unit, the output terminal of described pre-amplifier unit connects the input end of described prime filter unit, the output terminal of described prime filter unit connects the input end of described A/D collecting unit, the output terminal of described A/D collecting unit connects the input end of described digital filtering unit, the output terminal of described digital filtering unit connects the input end of described defect recognition processing unit, the output terminal of described defect recognition processing unit connects the input end of described warning output unit.
Further, this pick-up unit also comprises two coupling capacitances, and described two coupling capacitances connect respectively the two ends of described magnetizing coil.
The leakage magnetic detection device that is used for ferrimagnet Non-Destructive Testing due to the present invention has adopted technique scheme, it is CPU control module in this device, synchronizing signal module, on-off circuit, power amplifier module, magnetizing coil connects successively, the output terminal of synchronizing signal module connects delay switch input end, delay switch output terminal connects magnetic leakage signal acquisition module input end, wherein magnetic leakage signal acquisition module is by the leakage field sensor connecting successively, pre-amplifier unit, prime filter unit, A/D collecting unit, digital filtering unit, defect recognition processing unit and warning output unit form.This pick-up unit effectively improves ferrimagnet Magnetic Flux Leakage Inspecting resolution, promotes Magnetic Flux Leakage Inspecting signal to noise ratio (S/N ratio), reaches tiny flaw, especially the thin type ferrimagnet of finding ferrimagnet, and then has promoted product quality.
Accompanying drawing explanation
Below in conjunction with drawings and embodiments, the present invention is described in further detail:
Fig. 1 is that the present invention is for the theory diagram of the leakage magnetic detection device of ferrimagnet Non-Destructive Testing;
Fig. 2 is the theory diagram of magnetic leakage signal acquisition module in this pick-up unit;
Fig. 3 is for adopting this device to carry out the schematic diagram of Magnetic Flux Leakage Inspecting.
Embodiment
As depicted in figs. 1 and 2, the present invention comprises CPU control module 1 for the leakage magnetic detection device of ferrimagnet Non-Destructive Testing, synchronizing signal module 2, on-off circuit 3, power amplifier module 4, magnetizing coil 5, delay switch 6 and magnetic leakage signal acquisition module 7, the output terminal of described CPU control module 1 connects the input end of described synchronizing signal module 2, the output terminal of described synchronizing signal module 2 connects respectively the input end of described on-off circuit 3 and delay switch 6, the output terminal of described on-off circuit 3 connects the input end of described power amplifier module 4, the output terminal of described power amplifier module 4 connects the input end of described magnetizing coil 5, the output terminal of described delay switch 6 connects the input end of described magnetic leakage signal acquisition module 7, described magnetic leakage signal acquisition module 7 comprises leakage field sensor 71, pre-amplifier unit 72, prime filter unit 73, A/D collecting unit 74, digital filtering unit 75, defect recognition processing unit 76 and warning output unit 77, the input end of described leakage field sensor 71 connects the output terminal of described delay switch 6, the output terminal of described leakage field sensor 71 connects the input end of described pre-amplifier unit 72, the output terminal of described pre-amplifier unit 72 connects the input end of described prime filter unit 73, the output terminal of described prime filter unit 73 connects the input end of described A/D collecting unit 74, the output terminal of described A/D collecting unit 74 connects the input end of described digital filtering unit 75, the output terminal of described digital filtering unit 75 connects the input end of described defect recognition processing unit 76, the output terminal of described defect recognition processing unit 76 connects the input end of described warning output unit 77.
Further, this pick-up unit also comprises two coupling capacitances, and described two coupling capacitances connect respectively the two ends of described magnetizing coil.
In this pick-up unit, CPU control module can adopt TMS320F2812 process chip, and this chip is processed frequency can reach 100M, has a plurality of high-speed data acquisition unit, can meet the application demand of this device.It can directly have the function of synchronizing signal module in this device, A/D collecting unit, digital filtering unit, defect recognition processing unit and warning output unit.In this device, synchronizing signal module is for the processing sequential of synchronous magnetizing coil and magnetic leakage signal acquisition module, and in positive pulse of synchronizing signal module or negative pulse, within the time, magnetic leakage signal acquisition module completes once complete workflow.The synchronizing signal sudden change pulse edge trigger switch circuit occurrence logic of synchronizing signal module changes, and triggers power amplifier module work, filters amplification module and adopts adjustable power amplifier, realizes the power adjustments of magnetizing coil.The voltage pulse output signal direct effect of power amplifier module, to magnetizing coil, produces alternating magnetic field, and the magnetization of detected object is carried out in this magnetic field.In order to improve magnetization coupling efficiency, avoid the impact of oscillating waveform on detecting unit.Magnetizing coil both sides can install coupling capacitance additional to improve coupling efficiency.Synchronizing signal module is applied to delay switch simultaneously, and its Main Function is after magnetizing field strong stability, opens the analyzing and processing work that magnetic leakage signal acquisition module carries out signal.The signal feedback of delay switch is carried out the replacement of leakage field transducer sensitivity to CPU control module the output of pulse signal that produces one+5v to leakage field sensor, opens the signals collecting function of A/D collecting unit simultaneously.First the magnetic leakage signal that leakage field sensor collects amplifies processing through pre-amplifier unit, millivolt level magnetic leakage signal is amplified to a volt level signal and is transferred to prime filter unit, the filtering that mainly high-frequency signals such as fluctuation of magnetizing coil decayed of prime filter unit.The analog signal transmission of processing through prime filter unit is to A/D collecting unit, and output digit signals is to digital filtering unit, and digital filtering unit can be chimeric to CPU control module, can carry out the enforcement of high speed filtering.Same defect recognition processing unit is chimeric to CPU control module, and it mainly realizes three functions, and first for working as the positive pulse of preamble module or the acquisition process of interior typical magnetic leakage signal of negative pulse cycle; The second relatively processing for typical magnetic leakage signal in typical magnetic leakage signal and previous negative pulse or positive pulse cycle within preamble module positive pulse or negative pulse cycle; The 3rd is defect and non-defect, and model is identified automatically.According to the testing result of defect recognition processing unit, by warning output unit, produce corresponding AIS, detect the defect of ferrimagnet.
As shown in Figure 3, it is alternating-current pulse magnetization that this device changes the conventional mode of magnetization, when leakage field sensor 71 approaches ferrimagnet 8 defect, and when the signal positive pulse cycle 91 magnetizes, signal H through theoretical model coupling of signals collecting
1u, during signal negative pulse cycle 92 excitation, collection signal H
1d, in a cycle of magnetization, participate in the signal H analyzing
1:
H
1=(H
1u+H
0)–(H
1d+H
0)
=H
1u–H
1d
In like manner, when leakage field sensor 71 has just left ferrimagnet 8 defect, when the signal positive pulse cycle 91 magnetizes, signal H through theoretical model coupling of signals collecting
2d, during signal negative pulse cycle 92 excitation, collection signal H
2u, in a cycle of magnetization, participate in the signal H analyzing
2:
H
2=(H
2d+H
0)–(H
2u+H
0)
=H
2d–H
2u
H wherein
0for background magnetic signal, contrast H
1with H
2can find, the interference that the two numerical value not only can avoid ground unrest to bring, also will produce than the more obvious difference of common differential signal simultaneously, therefore effectively improved ferrimagnet Magnetic Flux Leakage Inspecting resolution, promote Magnetic Flux Leakage Inspecting signal to noise ratio (S/N ratio), adaptive filtering mode simultaneously, has promoted the detectability of leakage field; Defect recognition processing unit can arrange the automatic analysis identification of defect by software, improved Magnetic Flux Leakage Inspecting efficiency, has promoted the product quality of ferrimagnet, and this device is particularly useful for the quality testing of light sheet products.
Claims (2)
1. the leakage magnetic detection device for ferrimagnet Non-Destructive Testing, it is characterized in that: this pick-up unit comprises CPU control module, synchronizing signal module, on-off circuit, power amplifier module, magnetizing coil, delay switch and magnetic leakage signal acquisition module, the output terminal of described CPU control module connects the input end of described synchronizing signal module, the output terminal of described synchronizing signal module connects respectively the input end of described on-off circuit and delay switch, the output terminal of described on-off circuit connects the input end of described power amplifier module, the output terminal of described power amplifier module connects the input end of described magnetizing coil, the output terminal of described delay switch connects the input end of described magnetic leakage signal acquisition module, described magnetic leakage signal acquisition module comprises leakage field sensor, pre-amplifier unit, prime filter unit, A/D collecting unit, digital filtering unit, defect recognition processing unit and warning output unit, the input end of described leakage field sensor connects the output terminal of described delay switch, the output terminal of described leakage field sensor connects the input end of described pre-amplifier unit, the output terminal of described pre-amplifier unit connects the input end of described prime filter unit, the output terminal of described prime filter unit connects the input end of described A/D collecting unit, the output terminal of described A/D collecting unit connects the input end of described digital filtering unit, the output terminal of described digital filtering unit connects the input end of described defect recognition processing unit, the output terminal of described defect recognition processing unit connects the input end of described warning output unit.
2. the leakage magnetic detection device for ferrimagnet Non-Destructive Testing according to claim 1, is characterized in that: this pick-up unit also comprises two coupling capacitances, and described two coupling capacitances connect respectively the two ends of described magnetizing coil.
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| CN108205011A (en) * | 2018-03-06 | 2018-06-26 | 中国计量大学 | Flaw detection circuit inside a kind of ferrimagnet based on low frequency leakage field |
| CN112098306A (en) * | 2019-12-12 | 2020-12-18 | 重庆交通大学 | Steel bar corrosion detection device based on spontaneous magnetic flux leakage |
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Application publication date: 20140827 |