CN202002910U - Wire-wound inductive magnetic flux variable feedback compensation sensor - Google Patents
Wire-wound inductive magnetic flux variable feedback compensation sensor Download PDFInfo
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- CN202002910U CN202002910U CN2010206535977U CN201020653597U CN202002910U CN 202002910 U CN202002910 U CN 202002910U CN 2010206535977 U CN2010206535977 U CN 2010206535977U CN 201020653597 U CN201020653597 U CN 201020653597U CN 202002910 U CN202002910 U CN 202002910U
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Abstract
The utility model relates to a wire-wound inductive magnetic flux variable feedback compensation sensor for performing nondestructive flaw detection on a ferromagnetic metal object. The wire-wound inductive magnetic flux variable feedback compensation sensor comprises an induction part and an embedded modulation-demodulation part, wherein the embedded modulation-demodulation part is electrically connected with the induction part; the induction part comprises a high-magnetism saturated characteristic iron core, a modulation winding and a feedback winding; the embedded modulation-demodulation part comprises a modulation-demodulation circuit; in another embodiment, the induction part comprises a high-magnetism saturated characteristic iron core and a working winding; therefore, by using an inductive variable, feedback compensation of a magnetic flux variable can be realized, and noise separation and elimination can be performed effectively; furthermore, extraction of high signal to noise ratio of an electromagnetic induction signal is realized; and real and reliable information can be provided for quantitative evaluation of electromagnetic nondestructive flaw detection of the ferromagnetic metal object.
Description
Technical field
The utility model relates to a kind of sensor, particularly relates to a kind of wire wound inductance magnetic flux variable feedback compensation formula sensor in order to the electromagnetism nondestructive examination of surveying the ferromagnetic metal object.
Background technology
At present, sensor process device at the nondestructive examination of ferromagnetic metal object, all be based on " stray field ", " leakage flux " or " electromagnetic induction " reaches principles such as " associated magnetic field associated effect ", adopt single or make up a plurality of " inductive coils ", " Hall element ", and " inductive coil " adds technology such as " Hall element " two merit configurations and form sensor device.In these sensor process device busies with the information that collects---the information that noise and signal mix, extract simultaneously and can't effectively separate, therefore, the original signal to noise ratio (S/N ratio) of sensing device is very low, this information generally can only be used for simple qualitative estimation, and can't carry out valuable quantification to damage---be qualitative assessment, can not satisfy the basic demand of reality nondestructive examination.
This shows that above-mentioned existing sensors device obviously still has inconvenience and defective, and demands urgently further being improved in structure and use.In order to solve the problem of above-mentioned existence, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, and common product does not have appropriate structure to address the above problem, this obviously is the problem that the anxious desire of relevant dealer solves.Therefore how to found a kind of novel wire wound inductance magnetic flux variable feedback compensation formula sensor, real one of the current important research and development problem that belongs to, also becoming the current industry utmost point needs improved target.
Summary of the invention
The purpose of this utility model is, a kind of wire wound inductance magnetic flux variable feedback compensation formula sensor is provided, utilization inductance variable is realized magnetic flux variable feedback compensation, effectively separate and the elimination noise, can realize the high s/n ratio of electromagnetic induction signal is extracted, for the quantitative evaluation of ferromagnetic metal object nondestructive examination provides true and reliable ground information.
The purpose of this utility model and to solve its technical matters be to adopt following technical scheme to realize.According to a kind of wire wound inductance magnetic flux variable feedback compensation formula sensor that the utility model proposes, it comprises: the sensing part, and it comprises: run through single or multiple by the high magnetic saturation characteristic iron core in the coil of enameled wire coiling; This sensing part is modulated onto the modulation winding of " known quantity electromagnetic states "; Reach feedback winding in order to the feedback current change information; And the embedded modem part, it is electrically connected at this sensing part, and this embedded modem partly comprises in order to electromagnetic circuit is carried out the modulation-demodulation circuit of modulation control.
The purpose of this utility model and solve its technical matters and also can be applied to the following technical measures to achieve further.
Aforesaid wire wound inductance magnetic flux variable feedback compensation formula sensor, wherein said electromagnetic circuit comprise modulation winding and feedback winding.
The purpose of this utility model and solve its technical matters and adopt in addition following technical scheme to realize again.According to a kind of wire wound inductance magnetic flux variable feedback compensation formula sensor that the utility model proposes, it comprises: the sensing part, and it comprises: run through single or multiple by the high magnetic saturation characteristic iron core in the coil of enameled wire coiling; And this sensing part is modulated onto " known quantity electromagnetic states " and work winding that can the feedback current change information; And the embedded modem part, it is electrically connected at this sensing part, and this embedded modem partly comprises in order to electromagnetic circuit is carried out the modulation-demodulation circuit of modulation control.
The purpose of this utility model and solve its technical matters and also can be applied to the following technical measures to achieve further.
Aforesaid wire wound inductance magnetic flux variable feedback compensation formula sensor, wherein said electromagnetic circuit comprises the work winding.
The utility model compared with prior art has tangible advantage and beneficial effect.By technique scheme, the utility model wire wound inductance magnetic flux variable feedback compensation formula sensor has following advantage and beneficial effect at least: the utility model electromagnetic induction signal utilization inductance variable is realized magnetic flux variable feedback compensation, effectively separation and elimination noise can be realized the high s/n ratio of electromagnetic induction signal is extracted,, for the quantitative evaluation of ferromagnetic metal object nondestructive examination provides true and reliable ground information.
Above-mentioned explanation only is the general introduction of technical solutions of the utility model, for can clearer understanding technological means of the present utility model, and can be implemented according to the content of instructions, and for above-mentioned and other purposes, feature and advantage of the present utility model can be become apparent, below especially exemplified by preferred embodiment, and conjunction with figs., be described in detail as follows.
Description of drawings
Fig. 1 is the structural drawing of the preferred embodiment of the utility model wire wound inductance magnetic flux variable feedback compensation formula sensor.
Fig. 2 is the structural drawing of another embodiment of the utility model wire wound inductance magnetic flux variable feedback compensation formula sensor.
Embodiment
For further setting forth the utility model is to reach technological means and the effect that predetermined goal of the invention is taked, below in conjunction with accompanying drawing and preferred embodiment, to according to its embodiment of wire wound inductance magnetic flux variable feedback compensation formula sensor, structure, feature and the effect thereof that the utility model proposes, describe in detail as after.
See also shown in Figure 1, wire wound inductance magnetic flux variable feedback compensation formula sensor, in order to electromagnetism nondestructive examination to the ferromagnetic metal object, this self-contained magnetic field of ferromagnetic metal object (" external magnetic field ") information, this sensor partly is made up of sensing part and embedded modem, this embedded modem partly is electrically connected at this sensing part, and wherein this sensing part comprises high magnetic saturation characteristic iron core 1, runs through in the single or multiple coils by the enameled wire coiling; Modulation winding 2 is modulated onto this sensing part " known quantity electromagnetic states "; Feedback winding 3 is in order to the feedback current change information.This embedded modem partly comprises modulation-demodulation circuit 4, and in order to electromagnetic circuit is carried out modulation control, this electromagnetic circuit comprises modulation winding 2 and feedback winding 3.
Continue to consult shown in Figure 1, the utility model is in when work, the voltage U of constant this sensor of input
iGive modulation-demodulation circuit 4, quantitative electric current I f to modulation winding 2 input setpoint frequency f, because of the high magnetic saturation characteristic iron core of electromagnetic induction 1 inside generates an electromagnetic field, high magnetic saturation characteristic iron core 1 keeps quantitative magnetic flux Φ, and forming inductance L=Φ/I, the inductance L inductive reactance calculating xL through recording (xL=2 π f L) is not if there is the magnetic field of variation on every side, this sensor is in " known quantity electromagnetic states ", the stable state that promptly presets.When the ferromagnetic metal object in self-contained magnetic field enters this sensor sensing scope, the magnetic flux phi of this high magnetic saturation characteristic iron core 1 is subjected to " external magnetic field " informational influence change (become big or diminish by direction vector), " forgetting oneself " promptly changes, when magnetic flux change, modulation winding 2 and feedback winding 3 two ends produce induced electromotive force, it is feedback current i that induced current is arranged in the electromagnetic circuit, when this sensor is in modulation " known quantity electromagnetic states ", feedback current i=0, can record electric current variable ± Δ i at feedback winding 3 ends, self inductance will take place in the inductance L of this sensor this moment, show as induction reactance xL=2 π f L and increase the variation of obstruction electric current, make and the changes of magnetic field information of representing ferromagnetic metal object material or structure variation when being extracted, produce response and magnitude distortion by this sensor; Feedback winding 3 is given modulation-demodulation circuit 4 with the information feedback of electric current variable ± Δ i, by the former incoming frequency f of modulation-demodulation circuit 4 demodulation, modulation input frequency conversion Δ f improves induction reactance xL, thereby electric current variable ± Δ i that reason magnetic flux variable ΔΦ causes is gone back in compensation, i.e. compensation overcomes " the known quantity electromagnetic states " that " forgetting oneself " recovers modulation, reaches by " external magnetic field " sensed ΔΦ and output voltage signal U
0Between linear response.
Seeing also shown in Figure 2ly, is another embodiment of the present utility model, and Fig. 2 is consistent with the principle of Fig. 1, and this sensing part comprises high magnetic saturation characteristic iron core 1 ' in Fig. 2, runs through in the single or multiple coils by the enameled wire coiling; Work winding 2 ', this sensing part being modulated onto " known quantity electromagnetic states " also can the feedback current change information.This embedded modem partly comprises modulation-demodulation circuit 3 ', realizes electromagnetic circuit is carried out modulation control, and this electromagnetic circuit comprises work winding 2 '.
In Fig. 2, the utility model is in when work, the voltage U of constant this sensor of input
iGive modulation-demodulation circuit 3 ', the quantitative electric current I f of input setpoint frequency f to work winding 2 ', because of the high magnetic saturation characteristic iron core of electromagnetic induction 1 inside generates an electromagnetic field, high magnetic saturation characteristic iron core 1 keeps quantitative magnetic flux Φ, and forming inductance L=Φ/I, the inductance L inductive reactance calculating xL through recording (xL=2 π f L) is not if there is the magnetic field of variation on every side, this sensor is in " known quantity electromagnetic states ", the stable state that promptly presets.When " external magnetic field " this sensor sensing scope, the magnetic flux phi of this high magnetic saturation characteristic iron core 1 ' is subjected to " external magnetic field " influence change (become big or diminish by direction vector), " forgetting oneself " promptly changes, when magnetic flux change, the inductance L of this sensor produces back electromotive force and revolts this variation, making the electric current generation phase place and the difference in magnitude at work winding 2 ' two ends is Δ i, work winding 2 ' feeds back to modulation-demodulation circuit 3 ' with Δ i, modulation-demodulation circuit is by reading work winding 2 ' the instantaneous of two ends electric current, computing decision variable electric current Δ i, described identical when processing is afterwards worked with Fig. 1, do not repeat them here.
In Fig. 1, Fig. 2, magnetic field (" external the magnetic field ") information that tested ferromagnetic metal object is self-contained, can be divided into two classes by information attribute: a class is present in and has near magnetic signature ferromagnetic metal inner and the outside surface, represents " noise magnetic field " of metal material feature and object planform feature; Another kind of then is " the signal magnetic field " of representing damage of ferromagnetic metal object inside and outside and material variation; Because " noise magnetic field " have tangible continuity and gradually changeable, this sensors inductance L will not produce the self-induction response to " noise magnetic field ", so this sensor not only can discern " noise ", but also can handle " noise " letter that disappears effectively; " but signal magnetic field " then possesses outstanding randomness and mutability, this sensors inductance L will have strong self-induction response to " signal magnetic field ", and then realize reliably the electromagnetic induction signal extraction of (comprising current signal and voltage signal), feedback, modulation compensated and reduction output.
The utility model can record current change quantity ± Δ i at feedback winding 3 or work winding 2 ' end, and utilization ± Δ i feedback is improved induction reactance xL by regulating frequency f, compensation magnetic flux variable reduction real information.Ferromagnetic metal object with magnetic feature, because of environment of living in and shape and structure, material internal and the outside true Magnetic Field (noise magnetic field information) of a large amount of non-damages that exists, noise magnetic field information belongs to continuous gradation information, the true Magnetic Field of damage belongs to random mutation information, this sensor is only implemented feedback compensation to random mutation information and is extracted, and the noise magnetic field information of continuous gradation is had inhibition and elimination effect, therefore greatly improve this working sensor signal to noise ratio (S/N ratio), thereby effectively guaranteed the authenticity and the reliability of signal.
The above, it only is preferred embodiment of the present utility model, be not that the utility model is done any pro forma restriction, though the utility model discloses as above with preferred embodiment, yet be not in order to limit the utility model, any those skilled in the art are not in breaking away from the technical solutions of the utility model scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solutions of the utility model, according to technical spirit of the present utility model to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solutions of the utility model.
Claims (4)
1. wire wound inductance magnetic flux variable feedback compensation formula sensor is characterized in that it comprises:
The sensing part, it comprises:
Run through single or multiple by the high magnetic saturation characteristic iron core in the coil of enameled wire coiling;
This sensing part is modulated onto the modulation winding of " known quantity electromagnetic states "; And
Feedback winding in order to the feedback current change information; And
The embedded modem part, it is electrically connected at this sensing part, and this embedded modem partly comprises in order to electromagnetic circuit is carried out the modulation-demodulation circuit of modulation control.
2. wire wound inductance magnetic flux variable feedback compensation formula sensor according to claim 1 is characterized in that wherein said electromagnetic circuit comprises modulation winding and feedback winding.
3. wire wound inductance magnetic flux variable feedback compensation formula sensor is characterized in that it comprises:
The sensing part, it comprises:
Run through single or multiple by the high magnetic saturation characteristic iron core in the coil of enameled wire coiling; And
This sensing part is modulated onto " known quantity electromagnetic states " and work winding that can the feedback current change information; And
The embedded modem part, it is electrically connected at this sensing part, and this embedded modem partly comprises in order to electromagnetic circuit is carried out the modulation-demodulation circuit of modulation control.
4. wire wound inductance magnetic flux variable feedback compensation formula sensor according to claim 3 is characterized in that wherein said electromagnetic circuit comprises the work winding.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010206535977U CN202002910U (en) | 2010-12-07 | 2010-12-07 | Wire-wound inductive magnetic flux variable feedback compensation sensor |
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| CN2010206535977U CN202002910U (en) | 2010-12-07 | 2010-12-07 | Wire-wound inductive magnetic flux variable feedback compensation sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308743A (en) * | 2013-05-24 | 2013-09-18 | 华中科技大学 | Direct current metering device |
| CN111929492A (en) * | 2020-08-17 | 2020-11-13 | 哈尔滨工业大学 | Full-digital fluxgate type closed-loop current sensor and current signal acquisition method thereof |
-
2010
- 2010-12-07 CN CN2010206535977U patent/CN202002910U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308743A (en) * | 2013-05-24 | 2013-09-18 | 华中科技大学 | Direct current metering device |
| CN103308743B (en) * | 2013-05-24 | 2015-05-06 | 华中科技大学 | Direct current metering device |
| CN111929492A (en) * | 2020-08-17 | 2020-11-13 | 哈尔滨工业大学 | Full-digital fluxgate type closed-loop current sensor and current signal acquisition method thereof |
| CN111929492B (en) * | 2020-08-17 | 2022-07-29 | 哈尔滨工业大学 | Full-digital fluxgate type closed-loop current sensor and current signal acquisition method thereof |
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