Stress-induced magnetic anisotropy detection probe and device
By setting excitation coils wound in opposite directions on the two legs of the U-shaped iron core and detection coils set horizontally and hollowly, the problems of uneven magnetic field and signal interference in the prior art are solved, and higher detection accuracy and analysis results are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NINGXIA UNIVERSITY
- Filing Date
- 2025-06-24
- Publication Date
- 2026-08-04
AI Technical Summary
In existing stress-induced magnetization anisotropy detection probes, uneven excitation coil settings lead to uneven magnetic field strength, affecting the uneven magnetization of ferromagnetic specimens and resulting in inaccurate detection signals. Furthermore, the signals detected by the detection coils include both the excitation signal and the core hysteresis loss, which affects the accuracy of the measurement results.
Two sets of excitation coils are set on the two legs of the U-shaped iron core and connected in series. The excitation coils are wound in opposite directions. The detection coil is set horizontally between the two legs of the U-shaped iron core and is hollow to eliminate the hysteresis loss of the iron core and only measure the leakage magnetic signal.
It improves the uniformity of magnetization of ferromagnetic specimens and the detection accuracy of leakage magnetic signals, eliminates the influence of core hysteresis loss, and enhances the accuracy of measurement results.
Smart Images
Figure CN224594822U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of stress detection equipment technology, and in particular to a stress magnetization anisotropy detection probe and device. Background Technology
[0002] Stress concentration monitoring of ferromagnetic components during service is an important topic in the field of engineering safety. In recent years, stress-induced magnetic anisotropy has become an international research hotspot. Experimental studies on stress-induced magnetic anisotropy require measuring the magnetization response at different angles between the magnetic field and stress. The detection probe typically includes an excitation coil and a detection coil. The excitation coil generates a magnetic field, magnetizing the ferromagnetic specimen. The stress within the specimen distorts the magnetic field lines inside the ferromagnetic material, causing some of these lines to leak to the material surface, forming a leakage magnetic signal. The detection coil then detects this leakage magnetic signal.
[0003] In existing technologies, the detection probes used in experiments typically have an excitation coil at one end of a U-shaped iron core and a detection coil at the other end. This structure has several problems. First, because the excitation magnetic field exists in a loop along the U-shaped iron core and the line connecting its two ends, and this line connects the two ends of the U-shaped iron core in the direction closest to the ferromagnetic specimen, the excitation coil is only located at one end of the U-shaped iron core. This results in a stronger magnetic field at the end with the excitation coil and a weaker magnetic field at the other end. This uneven magnetic field leads to uneven magnetization of the ferromagnetic specimen, resulting in inaccurate measurement of leakage magnetic signals. Second, because the detection coil is located on the ferromagnetic specimen, the signal detected by the detection coil includes not only the leakage magnetic signal but also the excitation signal generated by the excitation coil. This leads to inaccurate signal acquisition in the experiment. Furthermore, the hysteresis loss of the iron core also affects the accuracy of the detection coil's signal detection, thus affecting the accuracy of the measurement results. Summary of the Invention
[0004] In view of this, it is necessary to provide a stress-induced magnetization anisotropy detection probe and device to improve the accuracy of the detection signal during stress-induced magnetization anisotropy experiments, thereby improving the accuracy of experimental analysis results.
[0005] This utility model provides a stress-induced magnetization anisotropy detection probe, including: a fixed frame, a detection coil, a U-shaped iron core, and two sets of series-connected excitation coils; the detection coil is hollow and horizontally arranged in the middle of the fixed frame; the two legs of the U-shaped iron core are mounted on both sides of the detection coil, and the line connecting the centers of the two legs of the U-shaped iron core coincides with the axis of the detection coil; the two sets of excitation coils are symmetrically wound on the two legs of the U-shaped iron core, and the winding directions of the two sets of excitation coils are opposite.
[0006] Preferably, the fixing frame includes: a fixing groove, a first fixing plate, and a second fixing plate; wherein, the fixing groove is a bottomless square groove and is located in the middle of the fixing frame; the first fixing plate and the second fixing plate are horizontally and symmetrically fixed on both sides of the fixing groove; the first fixing plate and the second fixing plate are symmetrically provided with a first fixing hole and a second fixing hole respectively; the detection coil is horizontally placed in the fixing groove; the U-shaped iron core is mounted on the fixing groove, and the bottom of the two legs of the U-shaped iron core are respectively inserted into the first fixing hole and the second fixing hole.
[0007] Preferably, the bottom of the first fixing plate and the bottom of the second fixing plate are on the same plane as the bottom of the fixing groove.
[0008] Preferably, it also includes: a cover, which is installed over the U-shaped iron core and the detection coil.
[0009] Preferably, the cover includes: a rectangular body; a wire outlet hole on the outer side of the body; handles on both sides of the body; and plate-shaped support legs extending outward from both sides of the bottom of the body.
[0010] This invention also provides a stress-induced magnetization anisotropy detection device, which uses any of the stress-induced magnetization anisotropy detection probes described above.
[0011] Preferably, it further includes: a signal generator, a power amplifier, an oscilloscope, and a host computer; the output terminal of the signal generator is connected to the input terminal of the power amplifier; the output terminal of the power amplifier is connected to both ends of the excitation coil; the output voltage detection terminal of the power amplifier is connected to the first input channel of the oscilloscope; both ends of the detection coil are connected to the second input channel of the oscilloscope; and the host computer is connected to the output channel of the oscilloscope.
[0012] The aforementioned stress-induced magnetization anisotropy detection probe, on the one hand, compared with the prior art in which the excitation coil is set at one end of the U-shaped iron core, this new invention sets excitation coils on both legs of the U-shaped iron core and connects the two sets of excitation coils in series. The winding directions of the two sets of excitation coils are opposite, so that the field strength of the excitation magnetic field can be evenly distributed, which improves the uniformity of the magnetization of the ferromagnetic specimen and further improves the accuracy of leakage magnetic signal detection. On the other hand, compared with the prior art in which the detection coil is set at the other end of the U-shaped iron core, this new invention sets the detection coil horizontally between the two legs of the U-shaped iron core, and the center of the detection coil is not placed with an iron core, making it hollow. This allows the detection coil to only measure the leakage magnetic signal, and also eliminates the influence of the iron core hysteresis loss, improving the accuracy of the measurement results, and thus improving the accuracy of the stress-induced magnetization anisotropy experimental detection and analysis results. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the overall structure of the stress magnetization anisotropy detection probe of this utility model, excluding the cover.
[0014] Figure 2 This is a schematic diagram of the stress magnetization anisotropy detection probe of this utility model, excluding the fixing frame and the cover.
[0015] Figure 3 This is a schematic diagram of the fixture structure for the stress-induced magnetization anisotropy detection probe in this utility model.
[0016] Figure 4 This is a schematic diagram of the overall structure of the stress magnetization anisotropy detection probe, including the cover, in this utility model.
[0017] Figure 5 This is a schematic diagram of the stress magnetization anisotropy detection device in this utility model.
[0018] In the figure: 1. Fixing frame; 10. Fixing groove; 11. First fixing plate; 12. Second fixing plate; 13. First fixing hole; 14. Second fixing hole; 15. Ferromagnetic specimen; 2. U-shaped iron core; 3. Excitation coil; 4. Detection coil; 5. Cover; 50. Body; 51. Outlet hole; 52. Handle; 53. Support leg; 6. Signal generator; 7. Power amplifier; 8. Oscilloscope; 9. Host computer. Detailed Implementation
[0019] The technical solutions and effects of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.
[0020] Please refer to Figure 1 and 2 As shown, a stress-induced magnetization anisotropy detection probe includes: a fixed frame 1, a detection coil 4, a U-shaped iron core 2, and two sets of series-connected excitation coils 3; the detection coil 4 is hollow and horizontally arranged in the middle of the fixed frame 1; the two legs of the U-shaped iron core 2 are mounted on both sides of the detection coil 4, and the line connecting the centers of the two legs of the U-shaped iron core 2 coincides with the axis of the detection coil 4; the two sets of excitation coils 3 are symmetrically wound on the two legs of the U-shaped iron core 2, and the winding directions of the two sets of excitation coils 3 are opposite.
[0021] In this embodiment, the mounting bracket is made of non-metallic material to fix the excitation coil 3 and the detection coil 4 together for easy testing. At the same time, the detection coil 4 is placed horizontally between the two excitation coils 3 and is hollow without an iron core. During testing, the leakage magnetic signal passes through the hollow part of the detection coil 4, which facilitates the detection coil 4 to capture the leakage magnetic signal. By setting the winding direction of the two sets of excitation coils 3 to opposite winding directions, the current generated by the two excitation coils 3 is in opposite directions when a signal is applied, so that the excitation magnetic field generated by the two excitation coils 3 can be superimposed on each other in the entire magnetic flux circuit, thereby making the magnetization of the ferromagnetic specimen 15 more thorough and complete.
[0022] Further, please refer to Figure 1 and3 As shown, the fixing frame 1 includes: a fixing groove 10, a first fixing plate 11, and a second fixing plate 12; wherein, the fixing groove 10 is a bottomless square groove and is located in the middle of the fixing frame 1; the first fixing plate 11 and the second fixing plate 12 are horizontally and symmetrically fixed on both sides of the fixing groove 10; the first fixing plate 11 and the second fixing plate 12 are respectively symmetrically provided with a first fixing hole 13 and a second fixing hole 14; the detection coil 4 is horizontally placed in the fixing groove 10; the U-shaped iron core 2 is mounted on the fixing groove 10, and the bottom of the two legs of the U-shaped iron core 2 are respectively inserted into the first fixing hole 13 and the second fixing hole 14.
[0023] Further, please see Figure 1 In order to improve the stability of the contact between the detection probe and the ferromagnetic specimen 15, and to further ensure the safety of the experiment and the accuracy of the measurement results, the bottom of the first fixing plate 11 and the second fixing plate 12 are located on the same plane as the bottom of the fixing groove 10.
[0024] Further, please see Figure 3 As shown, to improve the safety of the probe during use, a cover 5 is also included, which covers the U-shaped iron core 2 and the detection coil 4. This design encloses the excitation coil 3 and the detection coil 4 within the cover 5, preventing operators from accidentally touching the excitation coil and the detection coil.
[0025] Further, please see Figure 4 and 5 To improve the convenience of testing and facilitate operation by operators, the cover 5 includes: a rectangular body 51; a wire outlet hole 50 on the outer side of the body 51; handles 52 on both sides of the body 51; and plate-shaped support legs 53 extending outward on both sides of the bottom of the body 51.
[0026] In this embodiment, the wire outlet 50 is used to lead out the positive and negative poles of the excitation coil 3 and the detection coil 4 from the outer cover 5 and connect them to other equipment; the handle 52 is provided to facilitate the operator to move the detection probe 4 during measurement; the support leg 53 is provided so that the operator can attach the plate-shaped support leg 53 and the ferromagnetic specimen 15 together during measurement, which is convenient for measurement.
[0027] A stress-induced magnetization anisotropy detection device, using any of the stress-induced magnetization anisotropy detection probes described above.
[0028] Further, please see Figure 4As shown, it also includes: a signal generator 6, a power amplifier 7, an oscilloscope 8, and a host computer 9; the output terminal of the signal generator 6 is connected to the input terminal of the power amplifier; the output terminal of the power amplifier 7 is connected to both ends of the excitation coil 3; the output voltage detection terminal of the power amplifier 7 is connected to the first input channel of the oscilloscope 8; both ends of the detection coil 4 are connected to the second input channel of the oscilloscope 8; the host computer 9 is connected to the output channel of the oscilloscope 8, and the host computer 9 is equipped with OpenChoice Desktop software.
[0029] In this embodiment, the bottom of the fixing frame 1 is placed on the ferromagnetic specimen 15. One end of the ferromagnetic specimen 15 is fixed, and the other end is subjected to pressure or tension, causing compressive or tensile stress inside the ferromagnetic specimen 15. The input signal generated by the signal generator 6 is sent to the excitation coil 3 after passing through the power amplifier 7, thereby generating an excitation magnetic field. The excitation magnetic field excites the ferromagnetic specimen 15, and the stress in the ferromagnetic specimen 15 causes the magnetic field lines inside the ferromagnetic material to be distorted. Some of the magnetic field lines leak to the surface of the ferromagnetic specimen 15, forming a leakage magnetic signal. Since the detection coil 4 is set between the two legs of the U-shaped iron core 2 and is placed horizontally, the leakage magnetic signal just passes through the detection coil 4. At the center, the detection coil 4 captures the leakage magnetic signal; simultaneously, the output voltage detection terminal of the power amplifier 7 is connected to the first input channel of the oscilloscope 8, enabling the oscilloscope 8 to acquire the voltage signal generated by the excitation coil 3; the two ends of the detection coil 4 are connected to the second input channel of the oscilloscope 8, enabling the oscilloscope 8 to acquire the leakage magnetic signal detected by the detection coil 4; and through the host computer 9 connected to the oscilloscope 8, and the OpenChoiceDesktop software installed in the host computer 9, the signals generated by the excitation coil 3 and the leakage magnetic signal are acquired synchronously with the oscilloscope 8, and these acquired signals are saved for subsequent analysis of the experimental results.
[0030] The aforementioned stress-induced magnetization anisotropy detection probe, on the one hand, compared with the prior art in which the excitation coil 3 is set at one end of the U-shaped iron core 2, this new invention sets the excitation coil 3 on each of the two legs of the U-shaped iron core 2 and connects the two sets of excitation coil 3 in series. The winding directions of the two sets of excitation coil 3 are opposite, so that the field strength of the excitation magnetic field can be evenly distributed, which improves the uniformity of the magnetization of the ferromagnetic specimen 15 and further improves the accuracy of leakage magnetic signal detection. On the other hand, compared with the prior art in which the detection coil 4 is set at the other end of the U-shaped iron core 2, this new invention sets the detection coil 4 horizontally between the two legs of the U-shaped iron core 2, and the center of the detection coil 4 is not placed with an iron core, making it hollow. This allows the detection coil 4 to only measure the leakage magnetic signal, and also eliminates the influence of the iron core hysteresis loss, improving the accuracy of the measurement results, and thus improving the accuracy of the stress-induced magnetization anisotropy experimental detection and analysis results.
[0031] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Those skilled in the art can understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present utility model are still within the scope of the present utility model.
Claims
1. A stress-induced magnetic anisotropy detection probe, characterized by, include: The system consists of a fixed frame, a detection coil, a U-shaped iron core, and two sets of excitation coils connected in series. The detection coil is hollow and horizontally positioned in the middle of the fixed frame. The two legs of the U-shaped iron core are mounted on both sides of the detection coil, and the line connecting the centers of the two legs of the U-shaped iron core coincides with the axis of the detection coil. The two sets of excitation coils are symmetrically wound around the two legs of the U-shaped iron core, with the winding directions of the two sets of excitation coils being opposite.
2. The stress-induced magnetic anisotropy detection probe of claim 1, wherein, The fixing frame includes: a fixing groove, a first fixing plate, and a second fixing plate; wherein, the fixing groove is a bottomless square groove and is located in the middle of the fixing frame; the first fixing plate and the second fixing plate are horizontally and symmetrically fixed on both sides of the fixing groove; the first fixing plate and the second fixing plate are symmetrically provided with a first fixing hole and a second fixing hole respectively; the detection coil is horizontally placed in the fixing groove; the U-shaped iron core is mounted on the fixing groove, and the bottom of the two legs of the U-shaped iron core are respectively inserted into the first fixing hole and the second fixing hole.
3. The stress-induced magnetic anisotropy detection probe of claim 2, wherein, The bottoms of the first fixing plate and the second fixing plate are on the same plane as the bottom of the fixing groove.
4. The stress-induced magnetic anisotropy detection probe of claim 1, wherein, Also includes: The cover is placed over the U-shaped iron core and the detection coil.
5. The stress-induced magnetic anisotropy detection probe of claim 4, wherein, The cover includes: a rectangular body; a cable outlet hole on the outer side of the body; handles on both sides of the body; and plate-shaped support legs extending outward from both sides of the bottom of the body.
6. A stress-induced magnetic anisotropy detection device, characterized by, Use the stress magnetization anisotropy detection probe as described in any one of claims 1 to 5.
7. The stress-induced magnetocrystalline anisotropy detection apparatus of claim 6, wherein Also includes: The system consists of a signal generator, a power amplifier, an oscilloscope, and a host computer. The output of the signal generator is connected to the input of the power amplifier. The output of the power amplifier is connected to both ends of the excitation coil. The output voltage detection terminal of the power amplifier is connected to the first input channel of the oscilloscope. The two ends of the detection coil are connected to the second input channel of the oscilloscope. The host computer is connected to the output channel of the oscilloscope.