Magnetic property detection device and method

Abstract

A magnetic property detection device, using magnetic field generating coils (210, 210') to increase the speed of change of a generated magnetic field, and using capacitor energy storage power supply devices (220, 220') to supply a large instantaneous current to the magnetic field generating coils (210, 210'), achieving magnetic property detection with high-speed change and high magnetic field intensity. Further provided is a magnetic property detection method, comprising: at least when capacitor energy storage power supply devices (220, 220') discharge to magnetic field generating coils (210, 210'), detecting magnetic property information of a preset position of an object to be measured (400), so that the difficulty of synchronous detection of magnetic fields and magnetic signals in rapidly changing magnetic field environments can be solved, matching of magnetic properties and magnetic field states can be facilitated, and thus the magnetic properties of the object to be measured (400) can be analyzed.

Description

Magnetic detection device and method TECHNICAL FIELD

[0001] The present application belongs to the technical field of magnetic variable measurement, and relates to measurement by using magneto-optical effect, in particular to a magnetic detection device and method. BACKGROUND

[0002] The magneto-optical Kerr effect refers to the change of reflected light due to magnetization of the reflecting medium, so that the magnetism of the measured object can be obtained by detecting the reflected light of the surface of the measured object. On this basis, the magneto-optical Kerr detection device measures the polarization state of the reflected light of the measured object by emitting polarized light to the measured object, so as to measure the magnetism of the surface of the measured object.

[0003] In some cases, it is necessary to place the measured object in a magnetic field environment so that the magnetism of the measured object changes under the influence of the magnetic field environment, and the magneto-optical Kerr detection device is used to detect the change of the magnetism of the measured object, so as to analyze the magnetic properties of the measured object. In the prior art, an electromagnet is usually used to generate a magnetic field, and the pole head of the electromagnet is placed close to the measured object so that the measured object is placed in a controllable magnetic field environment. However, since the pole head material in the electromagnet is prone to generating induced current during operation, which partially offsets the magnetizing effect, accordingly, the speed of generating a magnetic field by the electromagnet is usually slow, which cannot meet the testing requirements in a high-speed changing magnetic field environment. In some cases, the speed of changing the magnetic field can be improved by removing the pole head or the magnetic core, but this method greatly reduces the magnetic field strength of the generated magnetic field environment, which cannot meet the testing requirements in a large magnetic field environment.

[0004] Therefore, in the existing magnetic field generation scheme, it is difficult to simultaneously satisfy the high-speed changing and large magnetic field strength of the magnetic field.

[0005] The above information disclosed in the background section is only used to enhance the understanding of the background of the present application, and therefore can contain information that is not prior art known to those of ordinary skill in the art. SUMMARY

[0006] In order to provide a device capable of detecting the magnetism of a measured object in a high-speed changing and large magnetic field strength magnetic field environment, the present application provides a magnetic detection device, comprising: a detector configured to emit polarized light as detection light to a preset position of a measured object, and to detect the polarization state of the detection light reflected by the measured object to detect the magneto-optical effect at the preset position; and a magnetic field generating device comprising a magnetic field generating coil and a capacitive energy storage power supply device for providing pulse current to the magnetic field generating coil, the magnetic field generating coil being configured to form at least a preset form of magnetic field at the preset position.

[0007] According to one embodiment of the present application, the detection light passes through the magnetic field generating coil and is incident on the measured object.

[0008] According to one embodiment of the present application, the capacitor energy storage power supply device comprises a capacitor charging circuit, an energy storage capacitor, and a capacitor discharging circuit, the energy storage capacitor is connected with an external power supply through the capacitor charging circuit, and the magnetic field generating coil is connected with the energy storage capacitor through the capacitor discharging circuit.

[0009] According to one embodiment of the present application, the capacitor energy storage power supply device comprises at least two energy storage capacitors, and the at least two energy storage capacitors are connected in series and / or in parallel to the capacitor discharging circuit.

[0010] According to one embodiment of the present application, the capacitor discharging circuit is provided with a commutating switch, and the direction of the preset magnetic field generated by the magnetic field generating coil is responsive to the state of the commutating switch.

[0011] According to one embodiment of the present application, the magnetic detection device further comprises a signal collector, the signal collector is communicatively connected with the detector and the magnetic field generating device, and the signal collector is configured to collect signals of the detector and the magnetic field generating device in response to a trigger signal.

[0012] According to one embodiment of the present application, the discharging of the capacitor energy storage power supply device is responsive to a trigger signal.

[0013] According to one embodiment of the present application, the trigger signal is at least one of a host computer signal, a controller signal, a level signal, an instruction signal, and a time signal.

[0014] According to one embodiment of the present application, the signal transmitted by the detector to the signal collector is responsive to a magneto-optical effect at the preset position, and the signal transmitted by the magnetic field generating device to the signal collector is responsive to a current of the magnetic field generating coil.

[0015] According to one embodiment of the present application, the detector is provided with two detectors, and the two detectors are respectively arranged on two sides of the measured object.

[0016] According to one embodiment of the present application, at least one magnetic field generating coil is arranged on each side of the measured object.

[0017] According to one embodiment of the present application, the measured object is arranged on the inner side or the outer side of the magnetic field generating coil.

[0018] The application further provides a magnetic detection method, comprising: emitting polarized light to a preset position of a detected object, detecting the polarization state of the polarized light reflected by the detected object to obtain magnetic information of the preset position; generating a preset magnetic field at the preset position by a magnetic field generating coil, using a capacitive energy storage power supply device to provide a current for generating the preset magnetic field to the magnetic field generating coil; and detecting the magnetic information of the preset position at least when the capacitive energy storage power supply device discharges to the magnetic field generating coil.

[0019] According to the embodiment of the application, the capacitive energy storage power supply device discharges to the magnetic field generating coil in a forward direction and a reverse direction, and the magnetic information of the preset position and the current through the magnetic field generating coil are detected respectively; the magnetic field information generated by the magnetic field generating coil at the preset position is calculated according to the current through the magnetic field generating coil; and a hysteresis loop is drawn according to the calculated magnetic field information and the detected magnetic information.

[0020] According to the embodiment of the application, the capacitive energy storage power supply device discharges to the magnetic field generating coil in a forward direction and a reverse direction multiple times to obtain multiple sets of the magnetic field information and the magnetic information; the corresponding magnetic field information and magnetic information in each set are averaged respectively to obtain a magnetic field average and a magnetic average, and a hysteresis loop is drawn according to the magnetic field average and the magnetic average.

[0021] According to the embodiment of the application, the capacitive energy storage power supply device provides the current to the magnetic field generating coil when receiving a trigger signal.

[0022] According to the embodiment of the application, the magnetic information of the preset position and the current through the magnetic field generating coil are detected simultaneously when receiving a trigger signal.

[0023] The application has at least the following beneficial effects:

[0024] The application provides a magnetic detection device, which uses the combination of a capacitive energy storage power supply device and a magnetic field generating coil, uses the magnetic field generating coil to increase the change speed of the generated magnetic field, uses the capacitive energy storage power supply device to provide a large instantaneous current to the magnetic field generating coil to further increase the change speed of the magnetic field, realizes a high-speed changing magnetic field, and greatly increases the instantaneous intensity of the magnetic field generated by the magnetic field generating coil, and realizes high-speed changing and large magnetic field intensity magnetic detection.

[0025] The application further provides a magnetic detection method, which detects the magnetic information of the preset position at least when the capacitor energy storage power supply discharges to the magnetic field generating coil, solves the difficulty of synchronous detection of the magnetic field and the magnetic signal in the environment of high-speed changing magnetic field, matches the detection time with the time when the magnetic field generating coil generates the magnetic field, so as to determine the time or time point corresponding to the collected magnetic information, and match the magnetism and the magnetic field state, so as to analyze the magnetism performance of the measured object. BRIEF DESCRIPTION OF DRAWINGS

[0026] Fig. 1 is a schematic diagram of the overall structure of one embodiment of the magnetic detection device.

[0027] Fig. 2 is a schematic diagram of the overall structure of one embodiment of the magnetic detection device.

[0028] Fig. 3 is a schematic diagram of the overall structure of one embodiment of the magnetic detection device.

[0029] Fig. 4 is a schematic diagram of the overall structure of one embodiment of the magnetic detection device.

[0030] Fig. 5 is a schematic diagram of the relationship between the preset position and the magnetic field generating coil involved in the magnetic detection device.

[0031] Fig. 6 is a schematic diagram of the overall structure of one embodiment of the magnetic detection device.

[0032] Fig. 7 is a schematic diagram of the overall structure of one embodiment of the magnetic detection device.

[0033] Fig. 8 is a schematic diagram of the connection relationship of one embodiment of the magnetic field generating device.

[0034] Fig. 9 is a schematic diagram of the overall structure of one embodiment of the magnetic detection device. DETAILED DESCRIPTION

[0035] In order to make the purpose and features of the application more obvious and easy to understand, the specific embodiments of the application are further described below in combination with the drawings. It should be noted that the drawings are very simplified and use non-precise ratios, and are only used for the purpose of conveniently and clearly assisting the description of the embodiments of the application.

[0036] The present application first provides a magnetic detection device, comprising a detector 100 configured to emit polarized light as detection light L to a preset position F of a measured object 400, and detect the polarization state of the detection light L reflected by the measured object 400 to detect the magneto-optical effect at the preset position F. Specifically, when the detection light L is polarized light and is incident on the measured object 400, the polarization state of the detection light L before and after reflection will change due to the influence of the magnetism at the reflection position when the measured object 400 reflects the detection light L, that is, the magneto-optical effect occurring at the preset position F of the measured object 400 affects the polarization state of the detection light L, and accordingly, the magnetism of the preset position F of the measured object 400 can be known by analyzing the change in the polarization state of the detection light L. For example, the Kerr rotation under the influence of the magneto-optical effect can be obtained by analyzing the polarization state of the detection light L, and then the magnetism of the preset position F of the measured object 400 can be obtained, for example, the magnetization or magnetic induction of the preset position F of the measured object 400.

[0037] For the specific form of the detector 100, it can include a light source 110 and a detection assembly 120.

[0038] For the light source 110, it can be configured to emit detection light L, which is at least polarized light when incident on the preset position F of the measured object 400. Specifically, a polarizer or polarizer can be inserted in the path of the light emitted by the light emitting device, or polarized light can be obtained by reflection or refraction, or a birefringent crystal or lens can be inserted in the path of the light emitted by the light source, or a dichroic mirror can be inserted in the path of the light emitted by the light source, etc. For the specific way of obtaining polarized light, those skilled in the art can choose according to actual needs, which will not be repeated here. For the detection light L, it is required to be polarized light when incident on the preset position F of the measured object 400, and the place in the light path of the detection light L that meets the requirement of polarized light is not limited here, for example, the polarized light can be formed in the light source 110, or the polarized light can be formed during the propagation of the detection light L. More specifically, the corresponding lens or optical device that makes the detection light L have the characteristics of polarized light only needs to be arranged in the light path before the detection light L is incident on the preset position F of the measured object 400.

[0039] For the detection assembly 120, it is configured to at least receive the detection light L reflected by the measured object 400, and the detection assembly 120 detects the magneto-optical effect at the preset position F according to the received detection light L. The detection assembly 120 can be configured as needed and in actual form, and can output corresponding data or signals. The detection assembly 120 is at least in the form of being able to detect the polarization state or polarization direction of the detection light L. As a more common form, the detection assembly 120 can include an analyzer 121 and a photodetector 122. The analyzer 121 is used to convert the polarization direction of the detection light L into light intensity information, and then the photodetector 122 is used to analyze the light intensity information to analyze the magneto-optical effect at the preset position F. In addition, a combination of a Wollaston prism 123 and two photodetectors 124 and 125 can also be used. The Wollaston prism 123 is used to divide the detection light L reflected by the measured object 400 into two beams of orthogonal polarized light, and the two beams of orthogonal polarized light enter the photodetectors 124 and 125 respectively. The magneto-optical effect at the preset position F is analyzed by jointly analyzing the signals of the two photodetectors 124 and 125. A wave plate or other optical device can also be used to transform and process the detection light L to detect the polarization state of the detection light L.

[0040] As a more feasible scheme, referring to FIGS. 1 to 4, the light source 110 includes a light emitting device 111 and a polarizer 112. The light emitted by the light emitting device 111 has a corresponding polarization state after passing through the polarizer 112, and can be used as the detection light L to be incident on the preset position F of the measured object 400. For the light emitting device 111, a laser light source can be selected, or a light emitting diode light source can be selected, or other devices capable of generating light can be selected as the light emitting device 111.

[0041] As a more feasible scheme, referring to FIGS. 1, 3, and 4, the detection assembly 120 can include an analyzer 121 and a photodetector 122. The detection light L reflected by the measured object 400 enters the photodetector 220 after passing through the analyzer 121. According to the signal of the photodetector 122, especially the light intensity signal, the corresponding magneto-optical effect is analyzed. Referring to FIG. 2, another scheme of the detection assembly 120 is shown. The detection assembly 120 can include a Wollaston prism 123 and two photodetectors 124 and 125. The detection light L reflected by the measured object 400 enters the two photodetectors 124 and 125 respectively after passing through the Wollaston prism 123. The corresponding magneto-optical effect is analyzed by operating between the two photodetectors 124 and 125, for example, by subtracting the signals of the two photodetectors 124 and 125.

[0042] Please refer to Fig. 1 and Fig. 2, the detection light L can be incident on the preset position F along a direction substantially perpendicular to the surface 401 where the preset position F is located, so as to detect at least the polar magneto-optical Kerr effect at the preset position F. Generally, a beam splitter 130 can also be arranged in the light path, the detection light L emitted by the light source 110 is incident on the preset position F through the beam splitter 130, and the detection light L reflected by the measured object 400 is incident on the detection assembly 120 through the beam splitter 130. As a feasible manner, please refer to the specific path of the detection light L1 in Fig. 5. In this case, the magnetism of the measured object 400 substantially perpendicular to the surface 401 where the preset position F is located can be detected at least by the detector 100, or the magnetism having a component in the aforementioned direction can be detected.

[0043] Please refer to Fig. 3 and Fig. 4, the detection light L can also be incident on the preset position F obliquely, specifically, the detection light L can pass through the inner ring 211 of the magnetic field generating coil 210, and the direction of the detection light L forms an angle with the vertical direction of the surface 401 where the preset position F of the measured object 400 is located. According to the needs, corresponding optical devices can be arranged in the light path, for example, please refer to Fig. 4, in some cases, a mirror 140 can be arranged to adjust the path of the detection light L. As a feasible manner, please refer to the specific path of the detection light L2 in Fig. 5. In this case, the magnetism of the measured object 400 substantially parallel to the in-plane direction of the surface 401 where the preset position F is located, or the magnetism substantially perpendicular to the direction of the surface 401 where the preset position F is located, or the magnetism having a component in the aforementioned direction can be detected. Generally, a smaller incident angle can be used to mainly analyze the magnetism in the vertical direction of the preset position F of the measured object 400, and a larger incident angle can be used to mainly analyze the magnetism in the vertical direction and the in-plane direction of the preset position F of the measured object 400.

[0044] The detection light L is polarized light, which mainly means that the detection light L can be regarded as linearly polarized light substantially, so as to obtain a better detection effect of the magneto-optical effect.

[0045] The magnetic detection device provided by the application further comprises a magnetic field generating device 200, which is used to provide a preset magnetic field environment at the preset position F to meet the detection requirements. Specifically, the preset magnetic field environment can affect the magnetism at the preset position F of the measured object 400, and in some cases, the magnetization direction, magnetization strength, magnetization area and other magnetic properties at the preset position F can change or not change. By detecting the magnetism at the preset position F by using the detector 100, the magnetism performance of the measured object 400 can be known. In some cases, the magnetism performance of the measured object 400 can be further analyzed by combining the magnetic field environment, the electrical environment, the temperature environment and other characteristics of the preset position F of the measured object 400.

[0046] The magnetic field generating device 200 specifically comprises a magnetic field generating coil 210 and a capacitor energy storage power supply device 220 for providing pulse current to the magnetic field generating coil 210.

[0047] The magnetic field generating coil 210 is configured to form a preset magnetic field at least at the preset position F. For the preset magnetic field, mainly the magnetic field generated at the preset position F during actual use, generally, the corresponding magnetic field required for detection can be determined in advance, and the magnetic field generating device 200 is adjusted so that the magnetic field generated by the magnetic field generating device 200 at the preset position F is close to the predetermined magnetic field; or, the magnetic field generating device 200 is adjusted, and according to the characteristics of the magnetic field generating device 200, the general form of the magnetic field generated by the magnetic field generating device 200 at the preset position F can be calculated, and the magnetic field is generated by using the magnetic field generating device 200; or, the magnetic field at the preset position F is detected at the preset position F or nearby, or the magnetic field at the preset position F is calculated according to at least part of the data of the magnetic field generating device 200. That is, the preset magnetic field can refer to the magnetic field required for detection at the preset position F, or the magnetic field at the preset position F calculated according to the magnetic field generating device 200, or the magnetic field actually generated at the preset position F by using the magnetic field generating device 200. Generally, the three are generally close or the same, and in some cases, there can be some differences, and generally, the magnetic field that can best reflect the actual magnetic field environment of the preset position F of the measured object 400 is selected as the aforementioned preset magnetic field.

[0048] The capacitor energy storage power supply device 220 can be electrically connected with the magnetic field generating coil 210 to provide current to the magnetic field generating coil 210 to generate a magnetic field. The capacitor energy storage power supply device 220 mainly refers to a device that at least stores energy through a capacitor and at least discharges the magnetic field generating coil 210 through the capacitor. The pulse current provided by the capacitor energy storage power supply device 220 to the magnetic field generating coil 210 can be a single pulse or multiple pulses; it can be a positive pulse, a negative pulse, or a multiple pulse containing a positive pulse and a negative pulse; for the waveform of the pulse current, no limitation is made here, and it can be adjusted as needed.

[0049] The magnetic field generated by the pole head or the magnetic core can avoid the influence of magnetic hysteresis and residual magnetism of the pole head or the magnetic core on the change speed of the magnetic field, greatly improve the change speed of the magnetic field, and make the preset position F of the measured object 400 in the magnetic field environment of the magnetic field generating coil 210 to meet the testing requirements in the high-speed changing magnetic field environment; the capacitor energy storage power supply device 220 provides pulse current to the magnetic field generating coil 210, which can provide at least instantaneous large current to the magnetic field generating coil 210 to further enhance the magnetic field strength generated by the magnetic field generating coil 210. Using the present scheme, a high-speed changing large magnetic field can be obtained, which can meet the detection requirements of high-speed large magnetic field, and the magnetism at the preset position F of the measured object 400 is detected by the detector 100 to further understand the magnetism of the measured object 400 and analyze the magnetic properties of the measured object 400.

[0050] Please refer to FIG. 5, as a relatively good embodiment, the axis of the magnetic field generating coil 210 is generally perpendicular to the surface 401 where the preset position F of the measured object 400 is located, so as to form a magnetic field generally perpendicular to the surface 401 where the preset position F of the measured object 400 is located in at least part of the area of the surface 401 where the preset position F of the measured object 400 is located.

[0051] Although the pole head or the magnetic core will affect the speed of the magnetic field, in some cases, for example, in the case where the requirement for the speed of the magnetic field is relatively low and the requirement for the strength of the magnetic field is relatively high, a corresponding pole head or magnetic core can be arranged near the magnetic field generating coil 210 according to the requirements, so as to at least enhance the strength of the magnetic field, and the size, shape, material, state and other characteristics of the pole head or the magnetic core are adjusted to reduce the influence of the pole head or the magnetic core on the change speed of the magnetic field at the preset position F, so as to meet the corresponding detection requirements.

[0052] The detection light L can be configured to pass through the magnetic field generating coil 210 and enter the measured object 400. Please refer to FIG. 5, the magnetic field generating coil 210 can be ring-shaped, which includes a hollow inner ring 211, and the detection light L passes through the inner ring 211. In this configuration, the relative position of the magnetic field generating coil 210 and the measured object 400 can be generally configured so that the inner ring 211 of the magnetic field generating coil 210 is arranged towards the measured object 400; when the axis of the magnetic field generating coil 210 is generally perpendicular to the plane 401 where the preset position F of the measured object 400 is located, a configuration can be formed which is relatively convenient for detecting the magnetism of the preset position F of the measured object 400 and calculating or obtaining the magnetic field at the preset position F.

[0053] When the inner ring 211 is projected on the surface 410 of the measured object 400 to form a projection range S1, the preset position F can be located within the projection range S1. In this case, the corresponding preset position F can be selected, adjusted or configured as a detection position within the projection range S1 as needed. As a better implementation, the preset position F can be located near the intersection of the axis of the magnetic field generating coil 210 and the surface 401 of the measured object 400, so that the magnetic field at the preset position F is easier to control and calculate. It should be noted that when the surface 410 of the measured object 400 is located on the inner side or the outer side of the magnetic field generating coil 210, the configuration mode in which the preset position F is located within the projection range S1 can be formed.

[0054] It should be noted that the cross section of the magnetic field generating coil 210 can be circular, square or any other shape, which can determine the range of the projection S1, for example, by the smallest cross section of the inner ring 211 to determine the range of the projection S1.

[0055] The capacitor energy storage power supply 220 can include a capacitor charging circuit, an energy storage capacitor, and a capacitor discharge circuit. The energy storage capacitor can store energy and release energy when needed. In some cases, the energy storage capacitor needs to go through a charging process so that it stores electrical energy. Accordingly, the energy storage capacitor can be connected to an external power source through a corresponding capacitor charging circuit to communicate with the external power source when needed, or disconnected from the external power source to meet the charging needs of the energy storage capacitor. In some cases, the relationship between the energy storage capacitor and the external power source can also be adjusted to adjust the discharge process of the energy storage capacitor. In order to enable the energy storage capacitor to provide pulse current to the magnetic field generating coil 210, the magnetic field generating coil 210 is connected to the energy storage capacitor through the capacitor discharge circuit, and the discharge process of the energy storage capacitor to the magnetic field generating coil 210 is adjusted and controlled through the capacitor discharge circuit to meet the needs of generating a preset magnetic field. For example, by adjusting the size, duration, rate of change, direction, fluctuation and other characteristics of the current provided by the energy storage capacitor to the magnetic field generating coil 210 through the capacitor discharge circuit, the magnetic field generating coil 210 generates a corresponding preset magnetic field.

[0056] In the scheme shown in FIG. 8, a feasible general structure of a capacitor energy storage power supply 220 is involved, in which the external power source can adopt a high-voltage charging power source, and the high-voltage charging power source is connected to the energy storage capacitor through the capacitor charging circuit. The discharge switch can be provided in the capacitor discharge circuit to control the discharge state of the energy storage capacitor to the magnetic field generating coil 220.

[0057] In some cases, the commutating switch can also be arranged in the capacitor discharge circuit, and the direction of the preset magnetic field generated by the magnetic field generating coil 210 can be responsive to the state of the commutating switch, that is, when the commutating switch is switched to a different state, the direction of the preset magnetic field generated by the magnetic field generating coil 210 changes accordingly, for example, when the commutating switch is in the first state, the preset magnetic field is in the first direction; when the commutating switch is in the second state, the preset magnetic field is in the second direction different from the first direction. Specifically, the change of the magnetic field direction can be realized by changing the direction of the current flowing through the magnetic field generating coil 210 when the commutating switch is switched to a different state; the change of the magnetic field direction can also be realized by making the current flow through different magnetic field generating coils 210 when the commutating switch is switched to a different state; and the change of the magnetic field direction can also be realized by combining the above two methods.

[0058] Referring to FIG. 8, the commutating switch is arranged in the capacitor discharge circuit, which can be configured in series with the discharge switch, in linkage with the discharge switch, or in the form of fusion of the functions of the discharge switch. For the specific circuit structure, reasonable configuration can be made according to the concept of the present scheme, which will not be described here.

[0059] In some cases, a single energy storage capacitor can meet the corresponding requirements, and a single energy storage capacitor for providing current to the magnetic field generating coil 210 can be arranged in the capacitor energy storage power supply device 220. In another case, a single energy storage capacitor may not meet the requirements, and multiple energy storage capacitors for providing current to the magnetic field generating coil 210 can be arranged in the capacitor energy storage power supply device 220. Specifically, the capacitor energy storage power supply device can include at least two energy storage capacitors, which can be connected in series, in parallel, or in a combination of series and parallel to the capacitor discharge circuit. Specifically, when the at least two energy storage capacitors are connected in series to the capacitor discharge circuit, the amount of stored energy or charge of the entire energy storage capacitor can be increased; when the at least two energy storage capacitors are connected in parallel to the capacitor discharge circuit, the speed of external discharge of the entire energy storage capacitor can be accelerated; in addition, multiple energy storage capacitors can be arranged as needed, and at least part of the energy storage capacitors can be connected in series and at least part of the energy storage capacitors can be connected in parallel, so as to adjust or take into account the amount of stored energy or charge of the entire energy storage capacitor and the speed of external discharge of the entire energy storage capacitor.

[0060] In some cases, the energy storage capacitor can also be connected to the discharge circuit to quickly release the energy in the circuit or the energy storage capacitor when there is a corresponding requirement, so as to ensure the safe and reliable operation of the circuit.

[0061] For the convenience of data collection and / or analysis, the magnetic detection device provided in the scheme can further comprise a signal collector, which is in communication connection with the detector 100 and the magnetic field generating device 200. Specifically, the communication connection can be achieved by wired connection, wireless connection, satellite communication, broadcast and television transmission, optical fiber communication, radio frequency identification, power line communication, virtual private network, point-to-point connection and the like, wherein local or local area connection modes such as wired connection, wireless connection, optical fiber communication and point-to-point connection are preferred. The signal collector can at least receive a trigger signal to start collecting corresponding signals. The signal collector can collect signals of the detector 100 and the magnetic field generating device 200. Accordingly, the collected signals of the detector 100 at least contain the magnetic information at the preset position F; the collected signals of the magnetic field generating device 200 at least contain the magnetic field information at the preset position F. At least in the case where the signal collector receives a trigger signal to start collecting corresponding signals, the signals of the detector 100 and the magnetic field generating device 200 collected by the signal collector can be collected synchronously to improve the synchronization of the magnetic information and the magnetic field information at the preset position F.

[0062] Referring to FIG. 8, as a possible implementation, the light detector refers to at least one of the photodetectors, and the signal collector collects signals of the corresponding photodetectors; the sampling module refers to a module that can at least detect the current of the magnetic field generating coil 210, and the signal collected by the sampling module is the signal of the magnetic field generating device 200, which is collected by the signal collector. In the case of triggering the signal collection of the signal collector by the trigger signal, the signal collector also needs to collect the trigger signal. Since the magnetic field generated by the magnetic field generating coil 210 has a linear relationship or mapping relationship with the current through the magnetic field generating coil 210, the magnetic field generated by the magnetic field generating coil 210 can be calculated by collecting the current of the magnetic field generating coil 210.

[0063] For the specific form of the sampling module, a voltage dividing resistor corresponding to the magnetic field generating coil 210 can be provided to calculate the current flowing through the magnetic field generating coil 210 according to the voltage of the voltage dividing resistor; the sampling module can also be a current sensor, and a current sensor is arranged in the circuit where the magnetic field generating coil 210 is located to obtain the current flowing through the magnetic field generating coil 210; the sampling module can also be at least according to the specific form of the capacitor discharge circuit and the energy storage capacitor, a device or module for simulating or calculating the current flowing through the magnetic field generating coil 210.

[0064] The discharging of the capacitor energy storage power supply device 220 can also be in response to the trigger signal. Specifically, when the capacitor energy storage power supply device 220 receives the trigger signal, it discharges to the magnetic field generating coil 210. Please refer to FIG. 8, which shows a possible implementation, in which the capacitor discharging circuit is in response to the trigger signal, and more specifically, the discharging switch in the capacitor discharging circuit can be in response to the trigger signal.

[0065] When the detection requirement of the rapid change of the magnetic field is required, the collection of the corresponding signal will have higher requirements, especially, the synchronization between the magnetic information at the preset position F and the magnetic field information needs to be stronger, so as to clearly determine the magnetism performance of the measured object. In the case of continuously collecting the signals of the detector 100 and the magnetic field generating device 200, it is usually difficult to determine the synchronization of the signals of the two, so as to determine the synchronization between the magnetic information at the preset position F and the magnetic field information, and the detection result cannot be used for the analysis of the magnetism performance of the measured object 400. Therefore, the present scheme makes the capacitor energy storage power supply device 220 and the signal collector respond to the same trigger signal, so as to ensure the synchronization of the signals of the detector 100 and the magnetic field generating device 200 collected at the same time when the capacitor energy storage power supply device 220 discharges to the magnetic field generating coil 210, and further ensure the synchronization between the magnetic information at the preset position F and the magnetic field information; at the same time, it can reduce the useless interval in the signal, improve the signal and data analysis efficiency, and improve the transmission speed of the signal and data.

[0066] The aforementioned trigger signal can be at least one of the host computer signal, the controller signal, the level signal, the instruction signal, and the time signal; the trigger signal can be one signal, or multiple signals, or a combination of signals.

[0067] The signal transmitted by the detector 100 to the signal collector is in response to the magneto-optical effect at the preset position F, that is, when the magneto-optical effect at the preset position F is different, the signal transmitted by the detector 100 to the signal collector is different; when the magneto-optical effect at the preset position F changes, the signal transmitted by the detector 100 to the signal collector changes.

[0068] The signal transmitted by the magnetic field generating device 200 to the signal collector is in response to the current through the magnetic field generating coil 210, that is, when the current through the magnetic field generating coil 210 is different, the signal transmitted by the magnetic field generating device 200 to the signal collector is different; when the current through the magnetic field generating coil 210 changes, the signal transmitted by the magnetic field generating device 200 to the signal collector changes.

[0069] In some cases, the measured object 400 has magnetic detection requirements on both sides, and accordingly, two detectors 100 can be provided and arranged on both sides of the measured object 400 to achieve double-sided detection of the measured object 400. Please refer to FIG. 6 and FIG. 7, which show specific embodiments of the application provided with two detectors 100, wherein the first detector 100 is arranged on the left side of the measured object 400, and the second detector 100' is arranged on the right side of the measured object 400.

[0070] When detecting the magnetism on both sides of the measured object 400, in some cases, one magnetic field generating coil 210 is sufficient to make the magnetic field environment of the two preset positions F on both sides of the measured object 400 meet the detection requirements; in another part of the case, it is difficult for one magnetic field generating coil 210 to make the magnetic field environment of the two preset positions F on both sides of the measured object 400 meet the detection requirements. At least one magnetic field generating coil 210 can be arranged on both sides of the measured object 400 as needed. Of course, the required number of magnetic field generating coils 210 can also be arranged on both sides of the measured object 400 as needed. Please refer to FIG. 6 and FIG. 7, wherein the magnetic field generating coil 210 is arranged on the left side of the measured object 400, and the magnetic field generating coil 210' is arranged on the right side of the measured object 400.

[0071] In some cases, in order to further make the magnetic field environment of the preset positions F on both sides of the measured object 400 the same, the two magnetic field generating coils 210, 210' can be symmetrically arranged on both sides of the measured object 400.

[0072] In some cases, the performance or structure of the magnetic field generating coils 210, 210' is the same; the performance or structure of the magnetic field generating coils 210, 210' can also be different; and the positional relationship between the coils 210, 210' and the measured object 400 is configured according to the detection requirements, so as to configure the magnetic field environment of the preset positions F of the measured object 400.

[0073] When two magnetic field generating coils 210, 210' are provided, in some cases, it is required to make the two magnetic field generating coils 210, 210' generate magnetic field at substantially the same time, accordingly, referring to Fig. 6, the magnetic field generating coils 210, 210' provided at the two sides of the measured object 400 can be connected to the same capacitor energy storage power supply device 220, so that the currents of the two magnetic field generating coils 210, 210' are substantially synchronized; referring to Fig. 7, the magnetic field generating coils 210, 210' provided at the two sides of the measured object 400 can also be connected to different capacitor energy storage power supply devices 220, 220' respectively, and the discharging times of the capacitor energy storage power supply devices 220, 220' are controlled to make the currents of the two magnetic field generating coils 210, 210' substantially synchronized. When the magnetic field generating coils 210, 210' provided at the two sides of the measured object 400 are connected to different capacitor energy storage power supply devices 220, 220' respectively, the discharging of the capacitor energy storage power supply devices 220, 220' can be made to respond to the same trigger signal, so as to further improve the synchronization of the currents of the two magnetic field generating coils 210, 210'.

[0074] In some cases, a slit can also be provided in the magnetic field generating coil, and the measured object 400 is located in the slit, although the magnetic field generating coil appears to have only one, but in essence, it has very similar functions and effects as using two magnetic field generating coils; the connection part between the magnetic field generating coils on the two sides of the slit functions to connect the coils on the two sides of the slit, and the magnetic field generating coils on the two sides of the slit can be equivalent to two magnetic field generating coils in essence. That is, the way of providing a slit in the magnetic field generating coil is equivalent to the way of providing two magnetic field generating coils.

[0075] In some cases, the space in the inner ring 211 of the magnetic field generating coil 210 is sufficient to accommodate the measured object 400, accordingly, the surface 410 of the measured object 400 can be located inside or outside the magnetic field generating coil 210, specifically, Fig. 9 shows a form of the measured object 400 at least including the surface 410 thereof located inside the inner ring 211 of the magnetic field generating coil 210, i.e. the form of the surface 410 of the measured object 400 located inside the magnetic field generating coil 210. It should be noted that the measured object 400 is provided inside or outside the magnetic field generating coil 210 mainly refers to that the measured surface 410 of the measured object 400 is located inside or outside the magnetic field generating coil 210.

[0076] Referring to FIGS. 1-7, the magnetic detection device can further include a stage 300 configured to fix or move the object 400. Specifically, referring to FIGS. 1-4, the stage 300 can provide an area on which the object 400 is placed, and can further provide a fixing effect on the object 400. Referring to FIGS. 1-4, 6, and 7, the stage 300 can fix or move the object 400 from one side of the object 400, or can fix or move the object 400 from an edge of the object 400. The stage 300 can have a platform form, or can have a form of a fixing structure or a displacement structure configured to fix or move the object 400, and can be selected as needed.

[0077] In some cases, the object 400 can need to be moved to adjust the position to be detected as needed, and accordingly, the stage 300 can move the object 400 in some cases. More specifically, the stage 300 can move the object 400 in a plane parallel to the surface 401 on which the predetermined position F of the object 400 is located.

[0078] The present application further provides a magnetic detection method, which specifically includes emitting polarized light to the predetermined position F of the object 400, and detecting the polarization state of the polarized light reflected by the object 400 to obtain magnetic information of the predetermined position F. The magnetic information of the predetermined position F includes at least the magnetic information of the predetermined position F described above, for example, the magnetization or magnetic induction intensity at the predetermined position F of the object 400.

[0079] The magnetic field generating coil 210 generates a predetermined magnetic field at the predetermined position F, and the capacitor energy storage power supply 220 provides a current for generating the predetermined magnetic field to the magnetic field generating coil 210.

[0080] The magnetic information of the predetermined position F is detected at least when the capacitor energy storage power supply 220 discharges to the magnetic field generating coil 210. More specifically, the detection process of the magnetic information of the predetermined position F is at least partially associated with the discharging process of the capacitor energy storage power supply 220 to the magnetic field generating coil 210, for example, the detection of the magnetic information of the predetermined position F is started when the capacitor energy storage power supply 220 starts discharging to the magnetic field generating coil 210, or the magnetic information of the predetermined position F is continuously obtained, and the start time of the discharging is marked in the magnetic information.

[0081] It should be noted that the aforementioned detection of the magnetic information of the preset position F refers to the start of recording or collecting the magnetic information of the preset position F; whether the magnetic information of the preset position F is detected or not is not completely corresponding to the irradiation state of the detection light on the measured object 400, for example, when the detection light L is irradiated on the measured object 400, the magnetic information of the preset position F can be detected or not.

[0082] In this way, the difficulty of synchronous detection of the magnetic field and the magnetic signal in the environment of the high-speed changing magnetic field is solved, and by matching the detection time with the time when the magnetic field generating coil 210 generates the magnetic field, the time or time point corresponding to the collected magnetic information is determined, so that the matching of the magnetism at the preset position F of the measured object 400 and the state of the magnetic field is facilitated, so as to analyze the magnetism of the measured object 400. For the corresponding feasible implementation mode, please refer to the foregoing content, which will not be repeated here.

[0083] In some cases, the capacitor energy storage power supply device 220 can be discharged forward and reverse to the magnetic field generating coil 210, so that the magnetic field generating coil 210 can generate magnetic fields in different directions at the preset position F, for example, generate magnetic fields in opposite directions. In this process, the preset position F of the measured object 400 will be in magnetic fields in opposite directions, which may cause changes in the magnetism of the preset position F of the measured object 400. When the capacitor energy storage power supply device 220 discharges forward and reverse to the magnetic field generating coil 210, the magnetic information of the preset position F is detected by the current through the magnetic field generating coil 210; according to the current through the magnetic field generating coil 210, the magnetic field generated by the magnetic field generating coil 210 at the preset position F is calculated as the magnetic field information.

[0084] Specifically, the magnetic information can be at least one of the magnetization or the magnetic induction; the magnetic field information can be at least one of the magnetic field strength or the magnetic field direction.

[0085] In the case that the capacitor energy storage power supply device 220 discharges forward and reverse to the magnetic field generating coil 210 at least once, the obtained magnetic field information at least contains information related to magnetic fields in opposite directions, and the obtained magnetic information at least contains information related to the magnetism of the measured object in the magnetic fields in opposite directions, so that the hysteresis loop can be drawn according to the calculated magnetic field information and the detected magnetic information.

[0086] Please refer to FIG. 8, the forward discharge and reverse discharge of the capacitor energy storage power supply device 220 to the magnetic field generating coil 210 can be controlled by the commutating switch.

[0087] In order to reduce the interference of abnormal data, improve the accuracy and signal-to-noise ratio of the hysteresis loop drawn, the capacitor energy storage power supply 220 can be used to discharge the magnetic field generating coil 210 multiple times in the forward direction and in the reverse direction to obtain multiple sets of magnetic field information and magnetic information. Then, the corresponding magnetic field information and magnetic information in each set are averaged to obtain the average magnetic field and the average magnetic property. Based on the average magnetic field and the average magnetic property, the hysteresis loop is drawn.

[0088] Specifically, at least one of the start time, the trigger signal time, the discharge time of the capacitor energy storage power supply 220, and the magnetic field information itself can be used to match the magnetic field information in each set. The matching magnetic field information is averaged to obtain the average magnetic field. Similarly, at least one of the start time, the trigger signal time, the discharge time of the capacitor energy storage power supply 220, and the magnetic information itself can be used to match the magnetic information in each set. The matching magnetic information is averaged to obtain the average magnetic property.

[0089] When the capacitor energy storage power supply receives the trigger signal, the capacitor energy storage power supply provides current to the magnetic field generating coil to control the generation of the preset magnetic field by controlling the trigger signal. When the trigger signal is received, the magnetic property information of the preset position and the current through the magnetic field generating coil are detected to control the collection of information by controlling the trigger signal. For specific implementation, please refer to the foregoing content, which will not be repeated here.

[0090] In addition, the magnetic detection method provided by the present application can be at least partially realized by the magnetic detection device described above. According to the foregoing description, those skilled in the art can at least use the magnetic detection device provided by the present application to realize the magnetic detection method provided by the present application. Of course, those skilled in the art can also make adaptive modifications on the basis of the scheme provided by the present application to meet the corresponding needs.

[0091] The basic principles, main features and advantages of the present application are shown and described above, so the above is only an embodiment of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiment, and the above embodiment and description in the specification are only the principles of the present application. Without departing from the spirit and scope of the present application, various equivalent changes and improvements will fall within the scope of the claimed present application.

Claims

1. A magnetic detection device, characterized by, The application relates to a magnetic detection device. The device comprises a detector configured to emit polarized light as detection light to a preset position of a measured object and detect the polarization state of the detection light reflected by the measured object to detect the magneto-optical effect at the preset position. The device further comprises a magnetic field generating device comprising a magnetic field generating coil and a capacitor energy storage power supply device for providing pulse current to the magnetic field generating coil, the magnetic field generating coil being configured to form a preset magnetic field at least at the preset position.

2. A magnetic detection device as claimed in claim 1, characterized in that: The detection light passes through the magnetic field generating coil and is incident on the measured object.

3. A magnetic detection device as claimed in claim 1, characterized in that: The capacitor energy storage power supply device comprises a capacitor charging circuit, an energy storage capacitor and a capacitor discharging circuit, the energy storage capacitor being connected to an external power source through the capacitor charging circuit, and the magnetic field generating coil being connected to the energy storage capacitor through the capacitor discharging circuit.

4. A magnetic detection device as claimed in claim 3, characterised in that: The capacitor energy storage power supply device comprises at least two energy storage capacitors connected in series and / or in parallel to the capacitor discharging circuit.

5. A magnetic detection device as claimed in claim 1, characterized in that: The capacitor discharging circuit is provided with a commutating switch, and the direction of the preset magnetic field generated by the magnetic field generating coil is responsive to the state of the commutating switch.

6. A magnetic detection device as claimed in claim 1, characterized in that: The magnetic detection device further comprises a signal collector in communication connection with the detector and the magnetic field generating device, and the signal collector is configured to collect signals of the detector and the magnetic field generating device in response to a trigger signal.

7. A magnetic detection device as claimed in claim 6, characterised in that: The trigger signal is at least one of a host computer signal, a controller signal, a level signal, an instruction signal and a time signal.

8. A magnetic detection device as claimed in any one of claims 1 or 6, characterized in that: The discharge of the capacitor energy storage power supply device is responsive to a trigger signal.

9. A magnetic detection device as claimed in claim 8, characterised in that: The trigger signal is at least one of a host computer signal, a controller signal, a level signal, an instruction signal and a time signal.

10. A magnetic detection device as claimed in claim 6, characterized in that: The signals transmitted by the detector to the signal collector are responsive to the magneto-optical effect at the preset position, and the signals transmitted by the magnetic field generating device to the signal collector are responsive to the current of the magnetic field generating coil.

11. A magnetic detection device as claimed in claim 1, characterized in that: The detector is provided with two detectors arranged on the two sides of the measured object respectively.

12. A magnetic detection device as claimed in claim 11, characterised in that: At least one magnetic field generating coil is arranged on the two sides of the measured object respectively.

13. A magnetic detection device as claimed in claim 1, characterized in that: The measured object is arranged on the inner side or the outer side of the magnetic field generating coil.

14. A magnetic detection method, characterized by: Polarized light is emitted to a preset position of a measured object, and the polarization state of the polarized light reflected by the measured object is detected to obtain the magnetic information of the preset position. A preset magnetic field is generated at the preset position by a magnetic field generating coil, and a capacitor energy storage power supply device is used to provide current for generating the preset magnetic field to the magnetic field generating coil. The magnetic information of the preset position is detected at least when the capacitor energy storage power supply device discharges to the magnetic field generating coil.

15. A magnetic detection method as claimed in claim 14, characterized in that: The magnetic information of the preset position and the current through the magnetic field generating coil are respectively detected when the capacitor energy storage power supply device discharges to the magnetic field generating coil in a forward direction and in a reverse direction. The magnetic hysteresis loop is drawn according to the calculated magnetic field information, the detected magnetic information and the current through the magnetic field generating coil.

16. The magnetic detection method of claim 14, wherein: The capacitor energy storage power supply device discharges the magnetic field generating coil multiple times in a forward direction and a reverse direction to obtain multiple sets of the magnetic field information and magnetic information; the corresponding magnetic field information and magnetic information in each set are respectively averaged to obtain a magnetic field average and a magnetic average, and a hysteresis loop is drawn according to the magnetic field average and the magnetic average.

17. The magnetic detection method of claim 14, wherein: When the capacitor energy storage power supply device receives a trigger signal, the capacitor energy storage power supply device provides a current to the magnetic field generating coil.

18. The magnetic detection method of claim 14, wherein: When the trigger signal is received, the magnetic information of the preset position and the current passing through the magnetic field generating coil are detected simultaneously.

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