CN113608154A - In-situ magnetic permeability detection probe, equipment and detection method - Google Patents
In-situ magnetic permeability detection probe, equipment and detection method Download PDFInfo
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Abstract
The invention relates to an in-situ magnetic permeability detection probe, in-situ magnetic permeability detection equipment and an in-situ magnetic permeability detection method. The in-situ magnetic conductivity detection probe is designed into a U-shaped structure, and a closed loop is formed when the bottoms of two core legs of a U-shaped iron core are attached to the surface of a piece to be detected when the piece to be detected is detected, so that the defect that the existing annular structure cannot measure a large structural component is overcome, and the in-situ and nondestructive detection of the magnetic conductivity is realized.
Description
Technical Field
The invention relates to the field of magnetic permeability detection, in particular to an in-situ magnetic permeability detection probe, in-situ magnetic permeability detection equipment and a detection method.
Background
In modern society, the need for controlling the quality of metals in machines, metal parts, tools and building materials during production and maintenance is undeniable.
Non-destructive inspection sensors have proven to be the most effective method of determining the quality of service of materials, since they can detect defects not only during construction, but also during maintenance, without interfering with or hindering their use. The existing nondestructive testing sensor is of an annular structure, and when the component to be tested is a part of a large structure, the component to be tested is not easy to detach or completely stops running, so that the nondestructive testing sensor cannot surround the component to be tested for testing.
Disclosure of Invention
The invention aims to provide an in-situ magnetic permeability detection probe, equipment and a detection method, so as to realize the in-situ detection of the magnetic permeability of a piece to be detected.
In order to achieve the purpose, the invention provides the following scheme:
an in-situ permeability detection probe, the probe comprising: the U-shaped iron core, the excitation coil and the receiving coil;
the excitation coil is wound at the middle part of the U-shaped iron core, and the receiving coil is wound on one core leg of the U-shaped iron core;
the U-shaped iron core is used for forming a closed loop when the bottoms of the two core pins of the U-shaped iron core are attached to the surface of the piece to be detected; the excitation coil is used for exciting a magnetic induction line in the closed loop after a power supply is switched on, and the excited magnetic induction line forms a magnetic circuit in the closed loop; the piece to be tested is used for generating an internal induction magnetic field in the magnetic circuit; the receiving coil is used for generating induced voltage under the action of the internal induced magnetic field.
Optionally, the excitation coil is an enameled wire with a diameter of 1mm, and the total length is 2 cm;
the excitation coil is wound in 4 layers in the middle of the U-shaped iron core, and each layer is wound by 17 circles.
Optionally, the receiving coil is an enameled wire with a diameter of 0.1mm, and the total length is 1.8 cm;
the receiving coil is wound on one core leg of the U-shaped iron core by 15 layers, and each layer is wound by 10 circles.
An in-situ permeability detection apparatus, the apparatus comprising: the device comprises a signal generator, a signal display device and the in-situ magnetic permeability detection probe;
the bottoms of two core pins of a U-shaped iron core in the in-situ magnetic conductivity detection probe are attached to the surface of a piece to be detected;
the signal generator is connected with two ends of an excitation coil of the in-situ magnetic conductivity detection probe and used for providing alternating current signals for the excitation coil so that the excitation coil can excite a magnetic induction line under the action of the alternating current signals;
one end of a receiving coil of the in-situ magnetic conductivity detection probe is connected with the signal display device, and the other end of the receiving coil of the in-situ magnetic conductivity detection probe is grounded; the receiving coil is used for generating induced voltage in an internal induced magnetic field generated by the piece to be detected and transmitting the induced voltage to the signal display device for displaying.
Optionally, the apparatus further comprises: a signal amplification circuit;
the input end of the signal amplification circuit is connected with one end of a receiving coil of the in-situ magnetic permeability detection probe, and the output end of the signal amplification circuit is connected with a signal display device;
the signal amplifying circuit is used for amplifying the voltage signal and transmitting the amplified voltage signal to a signal display device.
Optionally, the signal amplifying circuit includes: an operational amplifier, a divider resistor and a capacitor;
the first input end of the operational amplifier is connected with one end of the receiving coil of the in-situ magnetic permeability detection probe, the second input end of the operational amplifier is grounded, and the output end of the operational amplifier is connected with a signal display device;
one end of the divider resistor and the capacitor after being connected in parallel is connected with the first input end of the operational amplifier, and the other end of the divider resistor and the capacitor after being connected in parallel is connected with the output end of the operational amplifier.
Optionally, the signal display device is further connected to one end of the excitation coil, and the signal display device is further configured to display the alternating voltage of the excitation coil, and obtain and display a hysteresis loop according to the alternating voltage of the excitation coil and the induced voltage of the receiving coil.
Optionally, the signal display device is a digital oscilloscope.
An in-situ permeability detection method, which applies the in-situ permeability detection device, the method comprising:
attaching the bottoms of two core legs of a U-shaped iron core in an in-situ magnetic permeability detection probe to the surface of a reference measuring piece with known magnetic permeability to obtain the induced voltage of the reference measuring piece;
attaching the bottoms of two core pins of a U-shaped iron core in an in-situ magnetic conductivity detection probe to the surface of a piece to be detected to obtain the induced voltage of the piece to be detected;
and determining the magnetic permeability of the to-be-detected piece according to the induced voltage of the reference detection piece, the magnetic permeability of the reference detection piece and the induced voltage of the to-be-detected piece by utilizing a relational expression of the magnetic permeability and the voltage.
Optionally, the relationship between the magnetic permeability and the voltage is as follows:
where μ is the permeability, R1Is a resistance,. l1Is the length of the field coil, S is the area of the cross section, N1Is the number of turns of the field coil, V1Is the voltage of the field coil, V2T is the time for receiving the potential difference of the coil.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention discloses an in-situ magnetic permeability detection probe, in-situ magnetic permeability detection equipment and an in-situ magnetic permeability detection method. The in-situ magnetic conductivity detection probe is designed into a U-shaped structure, and a closed loop is formed when the bottoms of two core legs of a U-shaped iron core are attached to the surface of a piece to be detected when the piece to be detected is detected, so that the defect that the existing annular structure cannot measure a large structural component is overcome, and the in-situ and nondestructive detection of the magnetic conductivity is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a structural diagram of an in-situ permeability detection probe according to an embodiment of the present invention;
fig. 2 is an equivalent magnetic circuit when the in-situ permeability detection probe provided in the first embodiment of the present invention measures a to-be-measured object;
fig. 3 is a simplified equivalent magnetic circuit when the in-situ permeability detection probe provided in the first embodiment of the present invention measures a to-be-measured object;
fig. 4 is an equivalent circuit of the field coil according to an embodiment of the present invention;
fig. 5 is a circuit diagram of an in-situ permeability detection apparatus according to a second embodiment of the present invention;
FIG. 6 is a flowchart of an in-situ permeability detection method according to a third embodiment of the present invention;
description of the symbols: 1-U-shaped iron core, 2-excitation coil, 3-receiving coil and 4-piece to be measured.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide an in-situ magnetic permeability detection probe, equipment and a detection method, so as to realize the in-situ detection of the magnetic permeability of a piece to be detected.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The invention mainly utilizes a yoke-shaped sensor to carry out in-situ detection on the magnetic conductivity of a ferromagnetic material, and the detection principle is as follows:
the permeability (μ) is defined as a relationship between the magnetic flux density (B) of the magnetic field generated inside the material by the action of the external magnetic field H, as shown in the formula [1 ]:
permeability μ of any material and permeability μ of free space0In contrast, it can be represented by equation 2:
μ＝μr·μ0 (2)
wherein murReferred to as the relative permeability of the material.
For ferromagnetic materials, μrIs much greater than 1, which makes the magnetic field generated inside it much stronger than that generated in free space or air. Using this principle, ferromagnetic materials can be easily detected and the induced magnetic field inside the ferromagnetic material will be much weaker than expected compared to a defect-free assembly.
Example one
The invention provides an in-situ magnetic permeability detection probe, as shown in figure 1, the probe comprises: u-shaped iron core 1, excitation coil 2 and receiving coil 3.
The excitation coil 2 is wound on the middle part of the U-shaped iron core 1, and the receiving coil 3 is wound on one core leg of the U-shaped iron core 1. N in FIG. 11Number of turns of field coil, N2The number of turns of the receiving coil.
The U-shaped iron core 1 is used for forming a closed loop when the bottoms of two core legs of the U-shaped iron core 1 are attached to the surface of the piece to be detected 4; the excitation coil 2 is used for exciting a magnetic induction line in the closed loop after a power supply is switched on, and the excited magnetic induction line forms a magnetic circuit in the closed loop; the piece to be measured 4 is used for generating an internal induction magnetic field in the magnetic circuit; the receiving coil 3 is used to generate an induced voltage under the action of an internal induced magnetic field.
The sensor itself, due to its shape, can realize three quarters of a magnetic circuit, the material to be measured completing the remaining part, thus forming a closed loop as shown in fig. 1.
The sensor consists of three main parts: a yoke-type core made of DTC4 electrical pure iron, an exciting coil 2 as a flux source of the entire magnetic circuit, and a receiving coil 3 for receiving the signal magnetic density. In fig. 1, 4 is a test object. The gap between the piece 4 to be measured and the in-situ permeability probe is also visible, which must be taken into account when measuring, since they may corrupt the measurement result if the estimation is incorrect.
The equivalent magnetic circuit of the in-situ permeability detection probe is shown in fig. 2. Fig. 3 is a simplified version of changing the reluctance of the gap and core to a single reluctance. F1And F2Magnetomotive forces, R, of the exciting coil 2 and the receiving coil 3, respectivelyg1、Rg2In order to detect the magnetic resistance of the gap between the probe and the element to be detected 4 through the in-situ magnetic permeability, R gamma in figure 2 is the magnetic resistance of the yoke-shaped iron core, R gamma in figure 3 is the combined magnetic resistance of the magnetic core and the gap, R gammamPhi is the magnetic resistance of the material to be measured and phi is the magnetic flux of the circuit.
The excitation coil 2 is made of DT4C pure iron, the DT4C pure iron has the characteristic of high magnetic permeability, the excitation coil 2 is an enameled wire with the diameter of 1mm, and the total length is 2 cm; the excitation coil 2 is wound in 4 layers in the middle of the U-shaped iron core 1, and each layer is wound by 17 turns. The exciter coil 2 can be considered as an ideal inductance Ls, series resistance Rs, as shown in fig. 4.
The receiving coil 3 is an enameled wire with the diameter of 0.1mm and the total length of 1.8 cm; the receiving coil 3 is wound on one core leg of the U-shaped iron core 1 in 15 layers, each of which is wound 10 times.
Example two
The present invention also provides an in-situ permeability detection apparatus, as shown in fig. 5, the apparatus includes: a signal generator, a signal display device and the in-situ magnetic permeability detection probe of the first embodiment.
The bottoms of two core legs of a U-shaped iron core 1 in the in-situ magnetic conductivity detection probe are attached to the surface of a piece to be detected 4;
the signal generator is connected with two ends of an excitation coil 2 of the in-situ magnetic conductivity detection probe and is used for providing alternating current signals for the excitation coil 2 so that the excitation coil 2 excites a magnetic induction line under the action of the alternating current signals;
one end of a receiving coil 3 of the in-situ magnetic conductivity detection probe is connected with the signal display device, and the other end of the receiving coil 3 of the in-situ magnetic conductivity detection probe is grounded; the receiving coil 3 is used for generating induced voltage in an internal induced magnetic field generated by the piece to be measured 4 and transmitting the induced voltage to the signal display device for displaying.
The apparatus further comprises: a signal amplifying circuit. The input end of the signal amplification circuit is connected with one end of a receiving coil 3 of the in-situ magnetic permeability detection probe, and the output end of the signal amplification circuit is connected with a signal display device; the signal amplifying circuit is used for amplifying the voltage signal and transmitting the amplified voltage signal to the signal display device.
The signal amplification circuit includes: operational amplifier, divider resistance and electric capacity. The first input end of the operational amplifier is connected with one end of a receiving coil 3 of the in-situ magnetic permeability detection probe, the second input end of the operational amplifier is grounded, and the output end of the operational amplifier is connected with a signal display device; one end of the divider resistor and the capacitor after being connected in parallel is connected with the first input end of the operational amplifier, and the other end of the divider resistor and the capacitor after being connected in parallel is connected with the output end of the operational amplifier.
The signal display device is also connected with one end of the exciting coil 2, and is also used for displaying the alternating voltage of the exciting coil 2, and obtaining and displaying a hysteresis loop according to the alternating voltage of the exciting coil 2 and the induced voltage of the receiving coil 3. The signal display device is a digital oscilloscope.
The design principle of the in-situ magnetic permeability detection equipment is as follows:
according to equation (1), the magnetic field strength H is:
the magnetic flux density B is expressed as:
by the formula (1), the magnetic permeability is represented by the formulas (3) and (4):
the formulae (3) and (4) show that H is proportional to V1And B is proportional to V2Is calculated. This means that an integrator circuit must be implemented to obtain the signal of the receiving coil 3 in order to form a hysteresis loop on the oscillator.
The basic integrator circuit is shown in fig. 5. The value of the electrical element is C1＝2.2μF，C2＝1μF，C3＝C4＝100nF，R10.1 Ω, 10W (power resistance), R2＝1Ω，R3＝1kΩ，R 41 μm Ω. The input level is controlled by a current amplifier.
The composition of the circuit diagram is detailed:
the signal detection, processing and display process of magnetic permeability detection designed by the invention is shown in figure 5, and comprises A, B, C parts, wherein the part A is a detection probe part, consists of a signal pickup probe part with a solid frame and a voltage dividing resistor, and the resistor R is a resistor1、R2And R3A voltage-dividing protection resistor; part B is a signal processing amplifying part consisting of an operational amplifier and a resistor R4And a capacitor C1The operational amplifier is powered by a positive and negative 15V direct current power supply, and the positive and negative 15V direct current power supply passes through a capacitor C3And a capacitor C4Grounding; the part C is a signal display part, and the signal processing amplification part passes through a capacitor C2The excitation coil of the detection probe part is connected with the X input port of the signal display part, and the signal display part mainly comprises a digital oscilloscope.
The left half of the solid line frame in part A is a detection coil, and the right half is a receiving lineThe coils correspond to the exciting coil 2 and the receiving coil 3 in the figure 1 respectively, the exciting coil 2 is connected with the signal generator, and the signal generator provides an alternating current signal VinTwo legs of the yoke probe are arranged on the surface of a material to be detected, the two legs are ensured to be tightly attached to the material, a magnetic wire excited by the detection coil is formed in a closed loop formed by the yoke iron core and the material to be detected, the magnetic permeability of the material to be detected is different from that of the iron core, the magnetic circuit is affected differently, the change is received by the receiving coil 3, a signal is transmitted to the signal processing amplifying part through a wire, the signal is processed and amplified by the operational amplifier, and finally the signal is transmitted to the part C and displayed by the oscilloscope.
EXAMPLE III
The invention also provides an in-situ magnetic permeability detection method, as shown in fig. 6, the method uses the in-situ magnetic permeability detection device of the second embodiment, and the method comprises the following steps:
101, attaching the bottoms of two core legs of a U-shaped iron core 1 in an in-situ magnetic permeability detection probe to the surface of a reference measuring piece with known magnetic permeability to obtain the induced voltage of the reference measuring piece;
102, attaching the bottoms of two core legs of a U-shaped iron core 1 in an in-situ magnetic permeability detection probe to the surface of a piece to be detected 4 to obtain the induced voltage of the piece to be detected 4;
and 103, determining the magnetic permeability of the to-be-measured element 4 by using a relational expression of the magnetic permeability and the voltage according to the induced voltage of the reference to-be-measured element, the magnetic permeability of the reference to-be-measured element and the induced voltage of the to-be-measured element 4.
The magnetic permeability and voltage relation is as follows:
where μ is the permeability, R1Is a resistance,. l1Is the length of the field coil, S is the area of the cross section, N1Is the number of turns of the field coil, V1Is the voltage of the field coil, V2T is the time for receiving the potential difference of the coil.
And further, the proportional relation among the induced voltage of the reference measuring piece, the magnetic permeability of the reference measuring piece, the induced voltage of the piece to be measured 4 and the magnetic permeability of the piece to be measured 4 can be deduced, and the magnetic permeability of the piece to be measured 4 can be determined according to the proportional relation.
Example four
As a support of a sensor detection example, the feasibility and the practicability of the sensor are proved.
Measurement of (a) typical material.
To test the function of the permeability sensor, various samples were first measured in the laboratory. To test their calibration, sensors a and B were used. Their results are put together for comparison. The peak-to-peak and root mean square values of the output were measured as an indication of the permeability of the sample. Such measurements are typically used to detect defects in components for industrial applications.
1. Air and copper sheet
First, no-load measurements are made on the sensor. Then, a typical copper sheet is measured. As expected, materials made of air and copper do not have hysteresis due to their magnetic (or non-magnetic) properties.
2. Dog bone steel sample measurement
The next group measured the dog bone steel coupons, first measuring their wider edges and then their thinner middle portions.
3. Electrical steel sample
Three different electrical steel samples were measured, sample a was surface coated with an insulating varnish, and the rolling direction was parallel to the sample length. Sample B was also coated with an insulating varnish, with the rolling direction perpendicular to its length. And finally, the C sample is not insulated, and the rolling direction is parallel to the length. As shown in formula (6), the magnetic permeability is μ, and V2The integral is proportional with all other values known. The output results were measured by a digital oscilloscope (peak-to-peak) and a desk multimeter (RMS value) as shown in table 1.
TABLE 1 measurement results
Slight variations between the two sensors are readily observed. However, this only affects the offset values of the sensors, not their ability to measure stress.
Examining the above measurements, it is easy to conclude that the permeability sensor can detect the force applied to the metal part and that the measurements can be repeated. This basic principle can be used to assess the state that a component is in, and whether it is defective or functional.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. An in-situ permeability detection probe, comprising: the U-shaped iron core, the excitation coil and the receiving coil;
the excitation coil is wound at the middle part of the U-shaped iron core, and the receiving coil is wound on one core leg of the U-shaped iron core;
the U-shaped iron core is used for forming a closed loop when the bottoms of the two core pins of the U-shaped iron core are attached to the surface of the piece to be detected; the excitation coil is used for exciting a magnetic induction line in the closed loop after a power supply is switched on, and the excited magnetic induction line forms a magnetic circuit in the closed loop; the piece to be tested is used for generating an internal induction magnetic field in the magnetic circuit; the receiving coil is used for generating induced voltage under the action of the internal induced magnetic field.
2. The in-situ permeability detection probe according to claim 1, wherein the excitation coil is an enameled wire with a diameter of 1mm and a total length of 2 cm;
the excitation coil is wound in 4 layers in the middle of the U-shaped iron core, and each layer is wound by 17 circles.
3. The in-situ magnetic permeability detection probe according to claim 1, wherein the receiving coil is an enameled wire with a diameter of 0.1mm and a total length of 1.8 cm;
the receiving coil is wound on one core leg of the U-shaped iron core by 15 layers, and each layer is wound by 10 circles.
4. An in-situ permeability detection apparatus, the apparatus comprising: a signal generator, a signal display device and the in-situ permeability detection probe of any one of claims 1-3;
the bottoms of two core pins of a U-shaped iron core in the in-situ magnetic conductivity detection probe are attached to the surface of a piece to be detected;
the signal generator is connected with two ends of an excitation coil of the in-situ magnetic conductivity detection probe and used for providing alternating current signals for the excitation coil so that the excitation coil can excite a magnetic induction line under the action of the alternating current signals;
one end of a receiving coil of the in-situ magnetic conductivity detection probe is connected with the signal display device, and the other end of the receiving coil of the in-situ magnetic conductivity detection probe is grounded; the receiving coil is used for generating induced voltage in an internal induced magnetic field generated by the piece to be detected and transmitting the induced voltage to the signal display device for displaying.
5. The in-situ permeability detection apparatus of claim 1, further comprising: a signal amplification circuit;
the input end of the signal amplification circuit is connected with one end of a receiving coil of the in-situ magnetic permeability detection probe, and the output end of the signal amplification circuit is connected with a signal display device;
the signal amplifying circuit is used for amplifying the voltage signal and transmitting the amplified voltage signal to a signal display device.
6. The in-situ permeability detection apparatus of claim 5, wherein the signal amplification circuit comprises: an operational amplifier, a divider resistor and a capacitor;
the first input end of the operational amplifier is connected with one end of the receiving coil of the in-situ magnetic permeability detection probe, the second input end of the operational amplifier is grounded, and the output end of the operational amplifier is connected with a signal display device;
one end of the divider resistor and the capacitor after being connected in parallel is connected with the first input end of the operational amplifier, and the other end of the divider resistor and the capacitor after being connected in parallel is connected with the output end of the operational amplifier.
7. The in-situ permeability detection device of claim 4, wherein the signal display device is further connected to one end of the excitation coil, and is further configured to display the alternating voltage of the excitation coil, and obtain and display the hysteresis loop according to the alternating voltage of the excitation coil and the induced voltage of the receiving coil.
8. The in-situ permeability detection apparatus of claim 4, wherein the signal display device is a digital oscilloscope.
9. An in-situ permeability detection method, wherein the method applies the in-situ permeability detection device of any one of claims 4 to 8, the method comprising:
attaching the bottoms of two core legs of a U-shaped iron core in an in-situ magnetic permeability detection probe to the surface of a reference measuring piece with known magnetic permeability to obtain the induced voltage of the reference measuring piece;
attaching the bottoms of two core pins of a U-shaped iron core in an in-situ magnetic conductivity detection probe to the surface of a piece to be detected to obtain the induced voltage of the piece to be detected;
and determining the magnetic permeability of the to-be-detected piece according to the induced voltage of the reference detection piece, the magnetic permeability of the reference detection piece and the induced voltage of the to-be-detected piece by utilizing a relational expression of the magnetic permeability and the voltage.
10. The in-situ permeability detection method of claim 9, wherein the relationship between permeability and voltage is as follows:
where μ is the permeability, R1Is a resistance,. l1Is the length of the field coil, S is the area of the cross section, N1Is the number of turns of the field coil, V1Is the voltage of the field coil, V2T is the time for receiving the potential difference of the coil.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103499404A (en) * | 2013-10-10 | 2014-01-08 | 南昌航空大学 | Measuring device and measuring method for alternating stress of ferromagnetic component |
| CN203465407U (en) * | 2013-10-12 | 2014-03-05 | 北京航空航天大学 | Soft-magnetic-material-magnetic-conductivity measurement experiment device based on oscilloscope and signal generator |
| CN104375099A (en) * | 2013-08-12 | 2015-02-25 | 帅立国 | Material detection probe based on initial permeability method |
| CN106596713A (en) * | 2016-11-23 | 2017-04-26 | 电子科技大学 | Nondestructive testing probe system with high signal-to-noise ratio |
| CN107271536A (en) * | 2017-06-12 | 2017-10-20 | 中国石油化工股份有限公司 | Based on coercitive ferrimagnet electromagnetic nondestructive detection system and detection method |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104375099A (en) * | 2013-08-12 | 2015-02-25 | 帅立国 | Material detection probe based on initial permeability method |
| CN103499404A (en) * | 2013-10-10 | 2014-01-08 | 南昌航空大学 | Measuring device and measuring method for alternating stress of ferromagnetic component |
| CN203465407U (en) * | 2013-10-12 | 2014-03-05 | 北京航空航天大学 | Soft-magnetic-material-magnetic-conductivity measurement experiment device based on oscilloscope and signal generator |
| CN106596713A (en) * | 2016-11-23 | 2017-04-26 | 电子科技大学 | Nondestructive testing probe system with high signal-to-noise ratio |
| CN107271536A (en) * | 2017-06-12 | 2017-10-20 | 中国石油化工股份有限公司 | Based on coercitive ferrimagnet electromagnetic nondestructive detection system and detection method |
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