CN217786987U - Wire-wound inductive flux variable feedback compensation type sensor - Google Patents

Abstract

The utility model provides a wire-wound inductive flux variable feedback compensation type sensor, which comprises an induction part, an embedded modulation and demodulation part and an anti-interference layer, wherein the embedded modulation and demodulation part is electrically connected with the induction part; the induction part comprises a high magnetic saturation characteristic iron core penetrating through a single or a plurality of coils wound by enameled wires, and a modulation winding and a feedback winding sleeved on the high magnetic saturation characteristic iron core; the modulation winding is used to modulate the inductive portion to a "known quantity electromagnetic state"; the feedback winding is used for feeding back current change information; the embedded modulation and demodulation part comprises a modulation and demodulation circuit and a demodulation control circuit, wherein the modulation and demodulation circuit is used for carrying out modulation and demodulation control on the electromagnetic loop; the anti-interference layer is arranged on the outer side of the whole of the induction part and the embedded modulation and demodulation part in a surrounding mode and used for reducing mutual interference between the sensors. The utility model discloses can effectual separation and noise elimination, realize drawing electromagnetic induction signal's high SNR to mutual interference degree between the sensor has been reduced.

Description

Wire-wound inductive flux variable feedback compensation type sensor

Technical Field

The utility model relates to a sensor technical field especially relates to a wire-wound inductance magnetic flux variable feedback compensation formula sensor.

Background

At present, a sensor process device for nondestructive inspection of ferromagnetic metal objects is formed by adopting a single or combined multiple induction coils, hall elements, double-power configuration of the induction coils and the hall elements and other processes based on the principles of leakage magnetic fields, leakage magnetic fluxes or electromagnetic induction, correlation effects of related magnetic fields and the like. The information collected by the sensor process devices during operation, namely the information of noise mixed with signals, is effectively separated. The utility model discloses a utility model with application number CN201020653597.7 discloses a wire-wound inductance magnetic flux variable feedback compensation formula sensor can utilize inductance variable to realize magnetic flux variable feedback compensation, and effective separation and noise elimination can realize extracting the high SNR of electromagnetic induction signal, provide true reliable information for ferromagnetic metal article nondestructive inspection's quantitative evaluation.

However, in a specific use process, a plurality of sensor process devices are often required to be used in cooperation, but the sensor process devices are coupled by virtue of electromagnetic fields, so that the anti-interference capability is weak, and adjacent sensor process devices are easily influenced by electromagnetic induction to interfere with each other, so that the accuracy of a detection result is influenced.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: the wire-wound inductive flux variable feedback compensation type sensor can effectively separate and eliminate noise, realizes high signal-to-noise ratio extraction of electromagnetic induction signals, and reduces the mutual interference degree between the sensors.

In order to realize the purpose, the utility model discloses a technical scheme is: a wire-wound inductive flux variable feedback compensation type sensor comprises an induction part, an embedded modulation and demodulation part and an anti-interference layer, wherein the embedded modulation and demodulation part is electrically connected with the induction part; the induction part comprises a high magnetic saturation characteristic iron core penetrating through a single or a plurality of coils wound by enameled wires, and a modulation winding and a feedback winding sleeved on the high magnetic saturation characteristic iron core; the modulation winding is used to modulate the inductive portion to a "known quantity electromagnetic state"; the feedback winding is used for feeding back current change information; the embedded modulation and demodulation part comprises a modulation and demodulation circuit used for carrying out modulation and demodulation control on the electromagnetic loop; the anti-interference layer is arranged on the outer side of the whole of the induction part and the embedded modulation and demodulation part in a surrounding mode and used for reducing mutual interference between the sensors.

Preferably, the anti-interference layer comprises a first anti-interference layer, a fixing plate and a second anti-interference layer which are arranged in sequence.

Preferably, the first anti-interference layer and the second anti-interference layer have the same structure and respectively comprise metal grids which are vertically and uniformly distributed at equal intervals; the two anti-interference layers are respectively distributed on the inner surface and the outer surface of the fixing plate, and no gap exists between the projections of the two anti-interference layers on the fixing plate.

Preferably, the metal grid is made of copper bars.

According to the technical scheme, the beneficial effects of the utility model are that:

1. the sensor only implements feedback compensation extraction on random mutation information, and has the functions of inhibiting and eliminating continuously-graded noise magnetic field information, so that the working signal-to-noise ratio of the sensor is greatly improved, and the authenticity and the reliability of signals are effectively ensured.

2. The two anti-interference layers of the sensor are respectively distributed on the inner surface and the outer surface of the fixing plate, and no gap exists between the projections of the two anti-interference layers on the fixing plate, so that the mutual interference degree between the sensors is greatly reduced.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic structural diagram of the anti-interference layer of the present invention.

The labels in the figure are: 1. a first anti-interference layer 2, a fixing plate 3, a second anti-interference layer, 4, a high magnetic saturation characteristic iron core, 5, a modulation and demodulation circuit, 6 and a metal grid.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

The structure, ratio, size and the like shown in the drawings of the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by people familiar with the technology, and are not used for limiting the limit conditions which can be implemented by the present invention, so that the present invention does not have the substantial significance in the technology, and any structure modification, ratio relationship change or size adjustment should still fall within the scope which can be covered by the technical content disclosed by the present invention without affecting the efficacy which can be produced by the present invention and the achievable purpose.

Meanwhile, it is to be noted that, unless otherwise stated, "a plurality" means two or more; the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and simplified description, rather than to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention. The changes and adjustments of the relative relationship can be realized without substantial technical changes.

As shown in fig. 1 and 2, a wire-wound sensor with feedback compensation of an inductance flux variable comprises an induction part, an embedded modulation and demodulation part and an anti-interference layer, wherein the embedded modulation and demodulation part is electrically connected with the induction part. The induction part comprises a high magnetic saturation characteristic iron core 4 penetrating through one or more coils wound by enameled wires, and a modulation winding and a feedback winding sleeved on the high magnetic saturation characteristic iron core 4. The modulation winding is used to modulate the inductive portion to a "known quantity electromagnetic state"; the feedback winding is used for feeding back current change information. The embedded modulation and demodulation part comprises a modulation and demodulation circuit 5 which is used for modulation and demodulation control of the electromagnetic loop.

When the sensor works, the voltage Ui of the sensor is constantly input to a modulation and demodulation circuit 5, a quantitative current If with a set frequency f is input to a modulation winding, an electromagnetic field is generated inside an electromagnetic induction high magnetic saturation characteristic iron core 4, the high magnetic saturation characteristic iron core 4 keeps a quantitative magnetic flux phi and forms an inductance L = phi/I, the inductance xL (xL =2 pi fL) is calculated through the measured inductance L, and If the surrounding has no changed magnetic field, the sensor is in a known quantity electromagnetic state, namely a preset stable state. When a ferromagnetic metal object carrying a magnetic field per se enters the induction range of the sensor, the magnetic flux phi of the iron core 4 with high magnetic saturation characteristic is influenced by 'external magnetic field' information to change (become larger or smaller according to the vector direction), namely, change 'out-of-state', when the magnetic flux changes, induced electromotive force is generated at two ends of a modulation winding and a feedback winding, induced current, namely feedback current i exists in an electromagnetic loop, when the sensor is in a modulated 'known quantity electromagnetic state', the feedback current i =0, current variable +/-delta i can be measured at the end of the feedback winding, and at the moment, the inductance L of the sensor generates a self-induction phenomenon, namely, the inductance resistance xL =2 pi fL is increased to block the current change, so that the magnetic field change information representing the material or structure variation of the ferromagnetic metal object generates response and magnitude distortion while being extracted by the sensor; the feedback winding feeds back the information of the current variable +/-Delta i to the modulation and demodulation circuit 5, the original input frequency f is demodulated through the modulation and demodulation circuit 5, and the input variable frequency Delta f is modulated to improve the inductive reactance xL, so that the current variable +/-Delta i caused by the magnetic flux variable Delta phi is compensated and reduced, namely the 'state loss' is compensated and overcome to restore the modulated 'known quantity electromagnetic state', and the linear response between the Delta phi induced by the 'external magnetic field' and the output voltage signal U0 is achieved.

The information of the magnetic field (the 'external magnetic field') carried by the ferromagnetic metal object to be detected can be divided into two types according to the information attribute: one is a "noisy magnetic field" that exists inside and near the outer surface of ferromagnetic metal articles with magnetic field characteristics, representing both the characteristics of the metal material and the structural shape of the article; the other is a 'signal magnetic field' representing internal and external damage and material variation of a ferromagnetic metal object; because the noise magnetic field has obvious continuity and gradient, the sensor inductance L does not generate self-induction response to the noise magnetic field, so the sensor can not only identify the noise, but also effectively eliminate the noise; however, the signal magnetic field has outstanding randomness and mutation, and the sensor inductor L has strong self-induction response to the signal magnetic field, so that extraction, feedback, modulation compensation and reduction output of electromagnetic induction signals (including current signals and voltage signals) are reliably realized.

The utility model discloses record the current variable volume Δ i at feedback winding end, utilize the feedback of Δ i to improve inductance xL through adjusting frequency f, compensate magnetic flux variable reduction true information. Because of the environment and the shape structure of the ferromagnetic metal object with magnetic characteristics, a large amount of magnetic field information (noise magnetic field information) without damage facts exists inside and outside the material, the noise magnetic field information belongs to continuous gradual change information, the magnetic field information with damage facts belongs to random sudden change information, the sensor only carries out feedback compensation extraction on the random sudden change information and has the functions of restraining and eliminating the continuous gradual change noise magnetic field information, the working signal-to-noise ratio of the sensor is greatly improved, and therefore the authenticity and the reliability of signals are effectively guaranteed.

The anti-interference layer is arranged on the outer side of the whole of the induction part and the embedded modulation and demodulation part in a surrounding mode and used for reducing mutual interference between the sensors. The anti-interference layer includes first anti-interference layer 1, fixed plate 2 and the anti-interference layer 3 of second that sets gradually. First anti-interference layer 1 and the 3 structure unanimity of second anti-interference layer all include the metal grating 6 of equidistant vertical even arrangement, metal grating 6 is the copper bar material. The two anti-interference layers are respectively distributed on the inner surface and the outer surface of the fixing plate 2, and no gap exists between the projections of the two anti-interference layers on the fixing plate 2.

Through test tests, eight groups are tested in total, and the condition that an anti-interference layer is not arranged between two adjacent groups of sensors is respectively detected; arranging anti-interference layers, wherein a gap is formed between the projections of the two anti-interference layers on the fixing plate 2; and set up the anti-interference layer, the projection of two-layer anti-interference layer on fixed plate 2 does not have gapped condition between. The test results are given in the following table:

through test comparison discovery, as shown in the table, add the interference degree of each other that anti-interference layer can be effectual between the reduction sensor, when there is not gapped between the projection of two-layer anti-interference layer on fixed plate 2, the interference degree between the sensor is nearly zero, and the effect is best. The utility model discloses the anti-interference layer structure that sets up has greatly reduced the degree of interference of each other between the sensor.

It should be noted that the above embodiments are only used for illustrating the present invention, but the present invention is not limited to the above embodiments, and any simple modification, equivalent change and modification made to the above embodiments by the technical spirit of the present invention all fall into the protection scope of the present invention.

Claims (4)

1. A wire-wound inductance magnetic flux variable feedback compensation type sensor is characterized in that: the anti-interference device comprises an induction part, an embedded modulation and demodulation part and an anti-interference layer, wherein the embedded modulation and demodulation part is electrically connected with the induction part; the induction part comprises a high magnetic saturation characteristic iron core (4) penetrating through one or more coils wound by enameled wires, and a modulation winding and a feedback winding which are sleeved on the high magnetic saturation characteristic iron core (4); the modulation winding is used to modulate the inductive portion to a "known quantity electromagnetic state"; the feedback winding is used for feeding back current change information; the embedded modulation and demodulation part comprises a modulation and demodulation circuit (5) for performing modulation and demodulation control on the electromagnetic loop; the anti-interference layer is arranged on the outer side of the whole of the induction part and the embedded modulation and demodulation part in a surrounding mode and used for reducing mutual interference between the sensors.

2. A wire-wound inductive flux variable feedback compensated sensor according to claim 1, wherein: the anti-interference layer is including first anti-interference layer (1), fixed plate (2) and the anti-interference layer (3) of second that set gradually.

3. A wire-wound inductive flux variable feedback compensated sensor according to claim 2, wherein: the first anti-interference layer (1) and the second anti-interference layer (3) are consistent in structure and respectively comprise metal grids (6) which are vertically and uniformly distributed at equal intervals; the two anti-interference layers are respectively distributed on the inner surface and the outer surface of the fixing plate (2), and no gap exists between the projections of the two anti-interference layers on the fixing plate (2).

4. A wire-wound inductive flux variable feedback compensated sensor according to claim 3 wherein: the metal grating (6) is made of copper bars.

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