CN101281168B - Method for changing energize mode to realize different mode electromagnetic detection - Google Patents
Method for changing energize mode to realize different mode electromagnetic detection Download PDFInfo
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Abstract
The invention discloses a method which realizes electromagnetic testing in different ways through changing motivation models. Wherein, a sensor is imposed with different motivation models: a sine wave motivation is imposed when carrying out eddy current testing, a square wave motivation is imposed when carrying out magnetic flux leakage, and a high duty ratio pulse motivation is imposed when carrying out magnetic memory testing, then the sensing signals obtained in different motivation models are carried out different analysis and processing so as to obtain different detection parameters, thereby the invention not only can respectively realize single eddy current testing or magnetic flux leakage or magnetic memory testing according to the requirements of different components to be detected, but also can obtain the detection parameters of eddy current testing, magnetic flux leakage, and magnetic memory testing through time-sharing detection according the requirement of the same component to be detected. Thus, the invention brings great convenience for people and greatly reduces the production cost of the detector.
Description
Technical field
The present invention relates to a kind of lossless detection method, particularly relate to a kind of the utilization and change the method that incentive mode is realized the different modes electromagnetic detection.
Background technology
Non-Destructive Testing NDT (nondestructive test) does not destroy and damages the examined object body, to its performance, quality, a kind of technology that has or not inherent vice to detect.
Electromagnetic Testing Technology belongs to Dynamic Non-Destruction Measurement, electromagnetic detection is electricity and the magnetic property that utilizes material to present under electromagnetic action, thereby judge the test method of the relevant performance of material, Electromagnetic Testing Technology has been widely used in each industrial circle, and is particularly all the more so in manufacturing industry, space flight and aviation, field of petrochemical industry.Method based on the electromagnetic detection principle in the prior art mainly contains conventional eddy current detection method, far-field vortex checking method, magnetic memory detecting method, flux-leakage detection method, low frequency electromagnetic field detection method and microwave, current potential detection method or the like.
EDDY CURRENT is a kind of lossless detection method that is based upon on the electromagnetic induction principle basis, and it is applicable to conductive material.EDDY CURRENT is the approaching coil that is connected with alternating current of conductor, sets up alternating magnetic field by coil, and this alternating magnetic field passes through conductor, and the electromagnetic induction effect takes place with it, sets up eddy current in conductor.Eddy current in the conductor also can produce the magnetic field of oneself, and the effect of eddy current magnetism has changed the power in former magnetic field, and then causes the change of coil voltage and impedance.When defective appears in conductive surface or nearly surface, will have influence on the intensity and the distribution of eddy current, the variation of eddy current has caused the variation of magnetic test coil voltage and impedance again, according to this variation, just can know the existence of the interior defective of conductor indirectly.
It is to utilize under the effect of alternate load that the magnetic memory detects, in the defective of labour ferromagnetic workpiece be mingled with the position, can produce magnetic domain normalizing phenomenon, and stray field appears thereon, in defective locations and/or the concentrated relatively place of internal stress, metal magnetic conducting rate minimum, its magnetic field tangential component has maximal value, normal component is reindexing then, has null value; Surface of the work stray field normal component is scanned detection, just can determine region of stress concentration, thereby judge indirectly whether this ferromagnetic workpiece exists defective.Magnetic memory detection technology (MMT) is a new Dynamic Non-Destruction Measurement that develops rapidly in recent years, be magnetoelasticity and the magneto-mechanical effect of utilizing ferrimagnet, concentrate the position by the stress of the magnetic memory phenomenon that produces under load and the terrestrial magnetic field acting in conjunction being determined component surface or nearly surface.Magnetic memory detection technology is up to now the ferromagnetic metal parts to be carried out earlier damage to diagnose unique feasible detection method.Ferromagnetic component the time can be subjected to the acting in conjunction in load and magnetic field of the earth in operation, reach unanimity in the magnetic domain orientation of area of stress concentration, and produce stray field thereon, and this magnetic field is irreversible, promptly still can keep after plus load disappears.This ' irreversible ' effect of magnetic leakage field just is called the magnetic memory effect.In addition, under the condition of magnetic field of the earth existence, the magnetic domain pinning point can appear in the most concentrated place of defective in the hardware and snotter, and the magnetic leakage field also occurs on its surface.By checking this stray field, can find miniature little defective and region of stress concentration.
Magnetic Flux Leakage Inspecting is to form magnetic loop by permanent magnet, magnetic conductor and tested ferromagnetic material (as pipe, plate), and it is magnetized near the magnetic saturation state, detects the leakage flux that its defective causes again; If this ferromagnetic material does not have defective, then the magnetic line of force is limited within the tube wall, evenly distributes; If inside pipe wall or outer wall defectiveness, then flux path narrows down, and the magnetic line of force deforms, and the part magnetic line of force is also with outside the effusion tube wall and produce so-called leakage field; Stray field is placed in probe between two excitation poles, that be close to tube wall and detects, and produces corresponding induced signal, thereby obtains defect information.
Because various electromechanical detection methods have its different characteristics separately, just relatively be suitable for the detection of metal tube, rod, material as EDDY CURRENT, detection sensitivity to surface imperfection is very high, but it is unwell to the inherent vice that detects the metal material deep layer, therefore in application process, also just need pick-up unit corresponding to the whole bag of tricks, such as the eddy current testing instrument that has based on the EDDY CURRENT principle, detect the magnetic memory detector that has of principle based on magnetic memory, Magnetic Flux Leakage Inspecting instrument or the like arranged based on the Magnetic Flux Leakage Inspecting principle.Be adopt EDDY CURRENT or adopt the magnetic memory to detect or or adopting Magnetic Flux Leakage Inspecting all is to utilize probe separately or claim sensor to obtain the flaw indication of test specimen usually, and show the defect situation of test specimen by the Data Management Analysis mode of correspondence, owing to adopt different electromechanical detection methods need adopt different detecting instruments and sensor, thereby brought great inconvenience with regard to the use of giving people, make that also the manufacturing cost of instrument is higher simultaneously.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, provide a kind of the utilization to change the method that incentive mode is realized the different modes electromagnetic detection, it is the electromagnetic detection that realizes different modes at same magnetic test coil with different incentive modes, like this, just make a detector can realize multiple test function, bring great convenience both for people's use, can greatly reduce the cost of manufacture of detecting instrument again.
The technical solution adopted for the present invention to solve the technical problems is: a kind of utilization changes the method that incentive mode is realized the different modes electromagnetic detection, be with the excitation winding of magnetic test coil and detect winding and be wrapped in respectively and be used as sensor on the bar type ferromagnetic core tested member is detected induction that the excitation winding of magnetic test coil is by the single excitation of wherein a kind of signal of the pulse signal of sine wave exciting signal that AWG (Arbitrary Waveform Generator) produced, square wave excitation signal, high duty ratio or the timesharing excitation of two kinds, three kinds signals;
Wherein, the sine wave exciting signal that is applied, its maximum amplitude should make the magnetization of ferromagnetic core coil reach undersaturated condition, corresponding to sine-wave excitation, the signal that the detection winding of magnetic test coil is picked up carries out analyzing and processing by the eddy current signal processing unit of computer processing system after amplification, phase sensitive detection, Filtering Processing, A/D conversion, draw the EDDY CURRENT analysis result of tested member defective;
The square wave excitation signal that is applied, its amplitude reaches near state of saturation the magnetization of ferromagnetic core coil, corresponding to square wave excitation, the signal that the detection winding of magnetic test coil is picked up carries out analyzing and processing by the magnetic leakage signal processing unit of computer processing system after amplification, Filtering Processing, A/D conversion, draw the Magnetic Flux Leakage Inspecting analysis result of tested member defective;
The pulse signal of the high duty ratio that is applied, its amplitude makes the magnetization of ferromagnetic core coil reach hypersaturated state, pulse excitation corresponding to high duty ratio, the signal that the detection winding of magnetic test coil is picked up carries out analyzing and processing by the magnetic memory signal processing unit of computer processing system after amplification, Filtering Processing, A/D conversion, draw the magnetic memory check and analysis result of tested member defective.
The pulse signal of the sine wave exciting signal that described AWG (Arbitrary Waveform Generator) is sent and/or square wave excitation signal and/or high duty ratio is controlled by computer processing system.
The ferromagnetic plug of described winding magnetic test coil adopts one, and excitation winding and detection winding are wrapped in respectively on this ferromagnetic plug.
The ferromagnetic plug of described winding magnetic test coil adopts two, and two groups are encouraged or detect winding to be wrapped in respectively on two ferromagnetic plugs that are arranged in parallel in the reversal connection mode, detects or encourage winding then to cross over to be wrapped on two ferromagnetic plugs.
The ferromagnetic plug of described winding magnetic test coil adopts three, three ferromagnetic plugs are arranged in parallel, two groups are encouraged or detect winding to be wrapped in respectively in the reversal connection mode on the ferromagnetic plug in two outsides, on the ferromagnetic plug in the middle of detection or excitation winding then are wrapped in.
Described ferromagnetic plug is soft iron core preferably.
A kind of utilization of the present invention changes the method that incentive mode is realized the different modes electromagnetic detection, be based on same magnetic test coil same sensor in other words conj.or perhaps, apply different incentive modes by excitation winding to magnetic test coil, realize the electromagnetic detection of different modes, promptly obtain different electromagnetic detection parameters.
A kind of utilization of the present invention changes the method that incentive mode is realized the different modes electromagnetic detection, and the ferromagnetic plug that magnetic test coil twined is the soft iron plug preferably, and soft iron belongs to a kind of soft magnetic material, and its magnetic permeability is big, little (Hc＜10 of coercive force
2Peace/rice), magnetic hysteresis loss is low, and its magnetic hysteresis loop becomes the elongate strip shape, and soft iron magnetizes easily, and also demagnetization easily is applicable to alternating magnetic field.Utilize this feature of soft iron, with its inner core as cell winding, make under the situation of excitation winding energising, can more easily reach or near magnetic saturation, utilize then in the magnetic saturation zone, the characteristics that the less and externally-applied magnetic field of change of magnetic field strength changes greatly realize detecting.When selecting soft iron core for use, soft iron core can be done smallerly, and it is different from the selected magnetic core of fluxgate that can be used for testing magnetic field equally because fluxgate is to be used for testing Weak magentic-field, thereby its magnetic core select for use usually bigger.
A kind of utilization of the present invention changes the method that incentive mode is realized the different modes electromagnetic detection, ferromagnetic plug can adopt one or two or three, this depends primarily on the coiling mode of magnetic test coil, when the coiling of magnetic test coil adopt be absolute type the time, ferromagnetic plug is selected one for use, the excitation winding of magnetic test coil and detection winding are wrapped in respectively on this ferromagnetic plug, voltage signal input is arranged and when not having the external magnetic field and influencing at the excitation winding, the voltage that detects winding is output as a constant, the voltage output that has influence of magnetic field then to detect winding as the outside changes, obtain the flaw indication of tested member by this mode, because the defective of tested member has been brought the variation of external magnetic field; When the coiling of magnetic test coil adopt be differential type the time, ferromagnetic plug is selected two or three for use, excitation or to detect winding be two groups and be wrapped in respectively on two ferromagnetic plugs that are arranged in parallel in the reversal connection mode, detect or the excitation winding then twines on these two ferromagnetic plugs or on the ferromagnetic plug of another root, voltage signal input is arranged and when not having the external magnetic field and influencing at the excitation winding, detect the voltage output 0 of winding, the voltage output that has influence of magnetic field then to detect winding as the outside changes, and can obtain the coherent signal of tested member equally by this mode.
A kind of utilization of the present invention changes the method that incentive mode is realized the different modes electromagnetic detection, and eddy current signal processing unit, magnetic leakage signal processing unit, magnetic memory signal processing unit in the computer processing system can be realized with software.
A kind of utilization of the present invention changes the method that incentive mode is realized the different modes electromagnetic detection, three kinds of frequencies that signal is selected such as pulse signal of sine wave exciting signal, square wave excitation signal, high duty ratio, with respect between their threes, sine wave exciting signal is a high frequency, the square wave excitation signal is an intermediate frequency, and the pulse signal of high duty ratio is a low frequency.
Adopt the made detecting instrument of method of the present invention, both can realize respectively that single EDDY CURRENT or Magnetic Flux Leakage Inspecting or magnetic memory detected according to different tested member needs, also the mode that can adopt timesharing to detect at the needs of same tested member obtains the detection parameter that EDDY CURRENT, Magnetic Flux Leakage Inspecting, magnetic memory detect.
When needs carry out EDDY CURRENT, control AWG (Arbitrary Waveform Generator) by computer processing system and send the high_frequency sine wave pumping signal, excitation winding to magnetic test coil encourages, simultaneously, in computer processing system, enable the eddy current signal handling procedure, the excitation winding is subjected to form an alternating magnetic field after the excitation of sine wave signal, the electromagnetic induction effect of this alternating magnetic field by taking place with tested member, in tested member, set up eddy current, eddy current in the tested member also can produce the magnetic field of oneself, the effect of eddy current magnetism has changed the power in former magnetic field, and then cause the voltage of detection winding of magnetic test coil and the change of impedance, when defective appears in tested component surface or nearly surface, will have influence on the intensity and the distribution of eddy current, the variation of eddy current has caused the voltage of detection winding of magnetic test coil and the variation of impedance again, the detection signal that winding picked up is through amplifying, phase sensitive detection, Filtering Processing, analyzing and processing is carried out by the eddy current signal handling procedure of computer processing system in A/D conversion back, thereby draws the EDDY CURRENT analysis result of tested member defective;
When needs carry out Magnetic Flux Leakage Inspecting, control AWG (Arbitrary Waveform Generator) by computer processing system and send intermediate frequency square wave excitation signal, excitation winding to magnetic test coil encourages, simultaneously, in computer processing system, enable the magnetic leakage signal handling procedure, after the excitation winding is subjected to the excitation of square-wave signal, sensor is equivalent to a fluxgate, because sensor is near the magnetic saturation state, so existing leakage field effect of result that detects, eddy effect is also arranged, the detection signal that winding picked up is through amplifying, Filtering Processing, analyzing and processing is carried out by the magnetic leakage signal handling procedure of computer processing system in A/D conversion back, thereby draws the Magnetic Flux Leakage Inspecting analysis result of tested member defective;
When needs carry out magnetic memory detection, control the pulse signal that AWG (Arbitrary Waveform Generator) is sent the low frequency high duty ratio by computer processing system, excitation winding to magnetic test coil encourages, simultaneously, in computer processing system, enable the magnetic memory signal handling procedure, after the excitation winding is subjected to the excitation of high duty ratio pulse signal, sensor is equivalent to a fluxgate, the detection signal that winding picked up is through amplifying, Filtering Processing, analyzing and processing is carried out by the magnetic memory signal handling procedure of computer processing system in A/D conversion back, thereby draws the magnetic memory check and analysis result of tested member defective.
The invention has the beneficial effects as follows, be wrapped in respectively and be used as sensor on the bar type ferromagnetic core tested member is detected induction owing to adopted the excitation winding of magnetic test coil and detected winding, by same sensor is applied with different incentive modes, and carry out different analyzing and processing at the transducing signal that different incentive mode obtained, in the time will carrying out EDDY CURRENT, apply sine-wave excitation to sensor, then the signal that is picked up is carried out vortex analysis and handle the defect analysis result that can obtain the EDDY CURRENT mode; In the time will carrying out Magnetic Flux Leakage Inspecting, apply square wave excitation to sensor, then the signal that is picked up is carried out the defect analysis result that the leakage field analyzing and processing can obtain the Magnetic Flux Leakage Inspecting mode; In the time will carrying out magnetic memory detection, apply the pulse excitation of high duty ratio to sensor, then the signal that is picked up is carried out magnetic memory analyzing and processing and can obtain the defect analysis result that magnetic is remembered detection mode, thereby realized both can realizing respectively that single EDDY CURRENT or Magnetic Flux Leakage Inspecting or magnetic memory detected according to different tested member needs, also the mode that can adopt timesharing to detect at the needs of same tested member obtains EDDY CURRENT, Magnetic Flux Leakage Inspecting, the purpose of the detection parameter that the magnetic memory detects, bring great convenience both for people's use, can greatly reduce the cost of manufacture of detecting instrument again.
Below in conjunction with drawings and Examples the present invention is described in further detail; But a kind of change incentive mode that utilizes of the present invention realizes that the method for different modes electromagnetic detection is not limited to embodiment.
Description of drawings
Fig. 1 is a structural representation of realizing the inventive method;
Fig. 2 is the excitation waveform synoptic diagram that the present invention is used for EDDY CURRENT;
Fig. 3 is the excitation waveform synoptic diagram that the present invention is used for Magnetic Flux Leakage Inspecting;
Fig. 4 is that the present invention is used for the excitation waveform synoptic diagram that the magnetic memory detects;
Fig. 5 is first kind of mode synoptic diagram of coil winding in the inventive method;
Fig. 6 is the second way synoptic diagram of coil winding in the inventive method;
Fig. 7 is the third mode synoptic diagram of coil winding in the inventive method.
Embodiment
Shown in accompanying drawing, a kind of utilization of the present invention changes the method that incentive mode is realized the different modes electromagnetic detection, this method can be realized by following array apparatus, such as AWG (Arbitrary Waveform Generator) 1 is arranged, magnetic test coil 2, pre-amplifier unit 31, phase sensitive detection unit 32, filter processing unit 33, A/D converting unit 34, computer processing system 5, display unit 51, keyboard input block 52, AWG (Arbitrary Waveform Generator) 1 is controlled by computer processing system 5, the excitation winding 21 of magnetic test coil 2 is connected to the output of AWG (Arbitrary Waveform Generator) 1, the output of the detection winding 22 of magnetic test coil 2 is connected to the input of pre-amplifier unit 31, the output of pre-amplifier unit 31 is connected to the input of phase sensitive detection unit 32, the output of phase sensitive detection unit 32 is connected to the input of filter processing unit 33, the output of filter processing unit 33 is connected to the input of A/D converting unit 34, the output of A/D converting unit 34 is connected to computer processing system 5, the output of keyboard input block 52 is connected to computer processing system 5, keyboard input block 52 is used for input setting, the output of computer processing system 5 is connected to display unit 51, and the control signal output of computer processing system 5 is connected to pre-amplifier unit 31 respectively, phase sensitive detection unit 32, filter processing unit 33, A/D converting unit 34.
Certainly, method of the present invention also can be realized by other device.
A kind of utilization of the present invention changes the method that incentive mode is realized the different modes electromagnetic detection, be with the excitation winding 21 of magnetic test coil and detect winding 22 and be wrapped in respectively and be used as sensor on the bar type ferromagnetic core 6 tested member is detected induction that the excitation winding 21 of magnetic test coil is by the single excitation of wherein a kind of signal of the pulse signal of sine wave exciting signal that AWG (Arbitrary Waveform Generator) produced, square wave excitation signal, high duty ratio or the timesharing excitation of two kinds, three kinds signals;
Wherein, the sine wave exciting signal that is applied (as shown in Figure 2), its maximum amplitude should make the magnetization of ferromagnetic core coil reach undersaturated condition, corresponding to sine-wave excitation, the signal that the detection winding 22 of magnetic test coil is picked up carries out analyzing and processing by the eddy current signal processing unit of computer processing system 5 after amplification, phase sensitive detection, Filtering Processing, A/D conversion, draw the EDDY CURRENT analysis result of tested member defective;
The square wave excitation signal (as shown in Figure 3) that is applied, its amplitude reaches near state of saturation the magnetization of ferromagnetic core coil, corresponding to square wave excitation, the signal that the detection winding 22 of magnetic test coil is picked up carries out analyzing and processing by the magnetic leakage signal processing unit of computer processing system 5 after amplification, Filtering Processing, A/D conversion, draw the Magnetic Flux Leakage Inspecting analysis result of tested member defective;
The pulse signal of the high duty ratio that is applied (as shown in Figure 4), its amplitude makes the magnetization of ferromagnetic core coil reach hypersaturated state, pulse excitation corresponding to high duty ratio, the signal that the detection winding 22 of magnetic test coil is picked up carries out analyzing and processing by the magnetic memory signal processing unit of computer processing system 5 after amplification, Filtering Processing, A/D conversion, draw the magnetic memory check and analysis result of tested member defective.
Wherein:
The sine wave exciting signal that described AWG (Arbitrary Waveform Generator) 1 is sent and/or the pulse signal of square wave excitation signal and/or high duty ratio are controlled by computer processing system 5;
The ferromagnetic plug 6 that twines magnetic test coil can adopt one (as shown in Figure 5), and excitation winding 21 and detection winding 22 are wrapped in respectively on this ferromagnetic plug 6;
The ferromagnetic plug 6 that twines magnetic test coil also can adopt two (as shown in Figure 6), and two groups of excitation windings 21 are wrapped in respectively on two ferromagnetic plugs 6 that are arranged in parallel in the reversal connection mode, detect 22 leaps of winding and are wrapped on two ferromagnetic plugs 6; Certainly, also can be that two groups of detection windings are wrapped in respectively on two ferromagnetic plugs that are arranged in parallel in the reversal connection mode, the excitation winding is then crossed over and is wrapped on two ferromagnetic plugs;
The ferromagnetic plug 6 that twines magnetic test coil can also adopt three (as shown in Figure 7), three ferromagnetic plugs 6 are arranged in parallel, two groups of excitation windings 21 are wrapped in respectively in the reversal connection mode on the ferromagnetic plug 6 in two outsides, detect 22 of windings and are wrapped on the middle ferromagnetic plug 6; Certainly, also can be that two groups of detection windings are wrapped in respectively in the reversal connection mode on the ferromagnetic plug in two outsides, on the ferromagnetic plug in the middle of the excitation winding then is wrapped in;
A kind of utilization of the present invention changes the method that incentive mode is realized the different modes electromagnetic detection, be based on same magnetic test coil 2 same sensor in other words conj.or perhaps, apply different incentive modes by excitation winding 21 to magnetic test coil, realize the electromagnetic detection of different modes, promptly obtain different electromagnetic detection parameters.
A kind of utilization of the present invention changes the method that incentive mode is realized the different modes electromagnetic detection, and the ferromagnetic plug 6 that magnetic test coil 2 is twined is the soft iron plug preferably, and soft iron belongs to a kind of soft magnetic material, and its magnetic permeability is big, little (Hc＜10 of coercive force
2Peace/rice), magnetic hysteresis loss is low, and its magnetic hysteresis loop becomes the elongate strip shape, and soft iron magnetizes easily, and also demagnetization easily is applicable to alternating magnetic field.Utilize this feature of soft iron, with its inner core as cell winding, make under the situation of excitation winding energising, can more easily reach or near magnetic saturation, utilize then in the magnetic saturation zone, the characteristics that the less and externally-applied magnetic field of change of magnetic field strength changes greatly realize detecting.When selecting soft iron core for use, soft iron core can be done smallerly, and it is different from the selected magnetic core of fluxgate that can be used for testing magnetic field equally because fluxgate is to be used for testing Weak magentic-field, thereby its magnetic core select for use usually bigger.
A kind of utilization of the present invention changes the method that incentive mode is realized the different modes electromagnetic detection, ferromagnetic plug 6 can adopt one or two or three, this depends primarily on the coiling mode of magnetic test coil, when the coiling of magnetic test coil 2 adopt be absolute type the time, ferromagnetic plug 6 is selected one for use, the excitation winding 21 of magnetic test coil and detection winding 22 are wrapped in respectively on this ferromagnetic plug 6, voltage signal input is arranged and when not having the external magnetic field and influencing at excitation winding 21, the voltage that detects winding 22 is output as a constant, the voltage output that has influence of magnetic field then to detect winding as the outside changes, obtain the flaw indication of tested member by this mode, because the defective of tested member has been brought the variation of external magnetic field; When the coiling of magnetic test coil 2 adopt be differential type the time, ferromagnetic plug 6 is selected two or three for use, excitation winding 21 is two groups and is wrapped in respectively on two ferromagnetic plugs 6 that are arranged in parallel in the reversal connection mode, detecting 22 of windings twines on these the two ferromagnetic plugs 6 or on the ferromagnetic plug 6 of another root, voltage signal input is arranged and when not having the external magnetic field and influencing at excitation winding 21, detect the voltage output 0 of winding 22, the voltage output that has influence of magnetic field then to detect winding as the outside changes, and can obtain the coherent signal of tested member equally by this mode.
A kind of utilization of the present invention changes the method that incentive mode is realized the different modes electromagnetic detection, and eddy current signal processing unit, magnetic leakage signal processing unit, magnetic memory signal processing unit in the computer processing system 5 can be realized with software.
A kind of utilization of the present invention changes the method that incentive mode is realized the different modes electromagnetic detection, and the hardware of computer processing system 5 mainly includes cpu chip, fpga chip and dsp chip.CPU is a central processing unit, it is the abbreviation of English Central Processing Unit, it is the core of total system, also be the highest executable unit of total system, it is responsible for the execution of total system instruction, the computing of mathematics and logic, the storage of data and transmission, and internally and externally input and the control of exporting, so CPU mainly comprises arithmetical unit, controller and storer.Fpga chip (field programmable gate array) is the highest a kind of of integrated level in the special IC (ASIC), the user can reconfigure the logic module and the I/O module of FPGA inside, to realize user's logic, thereby also be used to simulation to CPU, the user is placed in the Flash chip the programming data of FPGA, be loaded among the FPGA by powering on, it is carried out initialization.Also can be online to its programming, realize system's on-line reorganization.Dsp chip also claims digital signal processor, is a kind of microprocessor with special construction.The Harvard structure that the inside of dsp chip adopts program and data to separate has special hardware multiplier, extensively adopts stream line operation, and special DSP instruction is provided, and can be used for realizing apace various digital signal processing algorithms.
A kind of utilization of the present invention changes the method that incentive mode is realized the different modes electromagnetic detection, three kinds of frequencies that signal is selected such as pulse signal of sine wave exciting signal, square wave excitation signal, high duty ratio, with respect between their threes, sine wave exciting signal is a high frequency, the square wave excitation signal is an intermediate frequency, and the pulse signal of high duty ratio is a low frequency.
Adopt the made detecting instrument of method of the present invention, both can realize respectively that single EDDY CURRENT or Magnetic Flux Leakage Inspecting or magnetic memory detected according to different tested member needs, also the mode that can adopt timesharing to detect at the needs of same tested member obtains the detection parameter that EDDY CURRENT, Magnetic Flux Leakage Inspecting, magnetic memory detect.
When needs carry out EDDY CURRENT, control AWG (Arbitrary Waveform Generator) 1 by computer processing system 5 and send the high_frequency sine wave pumping signal, excitation winding 21 to magnetic test coil encourages, simultaneously, in computer processing system 5, enable the eddy current signal handling procedure, excitation winding 21 is subjected to form an alternating magnetic field after the excitation of sine wave signal, the electromagnetic induction effect of this alternating magnetic field by taking place with tested member, in tested member, set up eddy current, eddy current in the tested member also can produce the magnetic field of oneself, the effect of eddy current magnetism has changed the power in former magnetic field, and then cause the voltage of detection winding 22 of magnetic test coil and the change of impedance, when defective appears in tested component surface or nearly surface, will have influence on the intensity and the distribution of eddy current, the variation of eddy current has caused the voltage of detection winding 22 of magnetic test coil and the variation of impedance again, detecting 22 pickoff signals of winding amplifies through pre-amplifier unit 31, phase sensitive detection unit 32 phase sensitive detections, filter processing unit 33 Filtering Processing, analyzing and processing is carried out by the eddy current signal handling procedure of computer processing system 5 in the A/D conversion back of A/D converting unit 34, thereby draws the EDDY CURRENT analysis result of tested member defective;
When needs carry out Magnetic Flux Leakage Inspecting, control AWG (Arbitrary Waveform Generator) 1 by computer processing system 5 and send intermediate frequency square wave excitation signal, excitation winding 21 to magnetic test coil encourages, simultaneously, in computer processing system 5, enable the magnetic leakage signal handling procedure, after excitation winding 21 is subjected to the excitation of square-wave signal, sensor is equivalent to a fluxgate, because sensor is near the magnetic saturation state, so existing eddy effect of result that detects, the leakage field effect is also arranged, the signal that detection winding 22 is picked up amplifies through pre-amplifier unit 31, filter processing unit 33 Filtering Processing, analyzing and processing is carried out by the magnetic leakage signal handling procedure of computer processing system 5 in the A/D conversion back of A/D converting unit 34, thereby draws the Magnetic Flux Leakage Inspecting analysis result of tested member defective; The phase sensitive detection unit 32 of this moment is skipped by the control of computer processing system 5, and promptly signal does not pass through phase sensitive detection unit 32;
When needs carry out magnetic memory detection, control the pulse signal that AWG (Arbitrary Waveform Generator) 1 is sent the low frequency high duty ratio by computer processing system 5, excitation winding 21 to magnetic test coil encourages, simultaneously, in computer processing system 5, enable the magnetic memory signal handling procedure, after excitation winding 21 is subjected to the excitation of high duty ratio pulse signal, sensor is equivalent to a fluxgate, the signal that detection winding 22 is picked up amplifies through pre-amplifier unit 31, filter processing unit 33 Filtering Processing, analyzing and processing is carried out by the magnetic memory signal handling procedure of computer processing system 5 in the A/D conversion back of A/D converting unit 34, thereby draws the magnetic memory check and analysis result of tested member defective.
The foregoing description only is used for further specifying a kind of utilization the of the present invention and changes the method that incentive mode is realized the different modes electromagnetic detection; but the present invention is not limited to embodiment; every foundation technical spirit of the present invention all falls in the protection domain of technical solution of the present invention any simple modification, equivalent variations and modification that above embodiment did.
Claims (6)
1. one kind is utilized and changes the method that incentive mode is realized the different modes electromagnetic detection, it is characterized in that: be with the excitation winding of magnetic test coil and detect winding and be wrapped in respectively on the ferromagnetic plug and tested member detected induction that the excitation winding of magnetic test coil is encouraged by the single excitation of wherein a kind of signal of the pulse signal of sine wave exciting signal that AWG (Arbitrary Waveform Generator) produced, square wave excitation signal, high duty ratio or the timesharing of two kinds, three kinds signals as sensor;
Wherein, the sine wave exciting signal that is applied, its maximum amplitude should make the magnetization of ferromagnetic core coil reach undersaturated condition, corresponding to sine-wave excitation, the signal that the detection winding of magnetic test coil is picked up carries out analyzing and processing by the eddy current signal processing unit of computer processing system after amplification, phase sensitive detection, Filtering Processing, A/D conversion, draw the EDDY CURRENT analysis result of tested member defective;
The square wave excitation signal that is applied, its amplitude reaches near state of saturation the magnetization of ferromagnetic core coil, corresponding to square wave excitation, the signal that the detection winding of magnetic test coil is picked up carries out analyzing and processing by the magnetic leakage signal processing unit of computer processing system after amplification, Filtering Processing, A/D conversion, draw the Magnetic Flux Leakage Inspecting analysis result of tested member defective;
The pulse signal of the high duty ratio that is applied, its amplitude makes the magnetization of ferromagnetic core coil reach hypersaturated state, pulse excitation corresponding to high duty ratio, the signal that the detection winding of magnetic test coil is picked up carries out analyzing and processing by the magnetic memory signal processing unit of computer processing system after amplification, Filtering Processing, A/D conversion, draw the magnetic memory check and analysis result of tested member defective.
2. a kind of utilization the according to claim 1 changes the method that incentive mode is realized the different modes electromagnetic detection, and it is characterized in that: the pulse signal of the sine wave exciting signal that described AWG (Arbitrary Waveform Generator) is sent and/or square wave excitation signal and/or high duty ratio is controlled by computer processing system.
3. a kind of utilization the according to claim 1 changes the method that incentive mode is realized the different modes electromagnetic detection, it is characterized in that: the ferromagnetic plug of described winding magnetic test coil adopts one, and excitation winding and detection winding are wrapped in respectively on this ferromagnetic plug.
4. a kind of utilization the according to claim 1 changes the method that incentive mode is realized the different modes electromagnetic detection, it is characterized in that: the ferromagnetic plug of described winding magnetic test coil adopts two, two groups are encouraged or detect winding to be wrapped in respectively on two ferromagnetic plugs that are arranged in parallel in the reversal connection mode, detect or encourage winding then to cross over to be wrapped on two ferromagnetic plugs.
5. a kind of utilization the according to claim 1 changes the method that incentive mode is realized the different modes electromagnetic detection, it is characterized in that: the ferromagnetic plug of described winding magnetic test coil adopts three, three ferromagnetic plugs are arranged in parallel, two groups are encouraged or detect winding to be wrapped in respectively in the reversal connection mode on the ferromagnetic plug in two outsides, on the ferromagnetic plug in the middle of detection or excitation winding then are wrapped in.
6. change the method that incentive mode is realized the different modes electromagnetic detection according to claim 1 or 3 or 4 or 5 described a kind of utilizations, it is characterized in that: described ferromagnetic plug is soft iron core preferably.
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