Light source coupled magnetic domain imaging device and method

Abstract

The invention discloses a light source coupled magnetic domain imaging device and method, and belongs to the technical field of magnetic domain imaging, the device comprises an optical fiber assembly connected in front of a polarizer, and the optical fiber assembly comprises at least two optical fibers; the wavelength division multiplexers are correspondingly connected with the at least two optical fibers respectively; each wavelength division multiplexer is correspondingly connected with a light source assembly, and each light source assembly comprises light sources with at least two colors; the lens assembly is at least arranged on an incident light path of a measured object; light emitted from the at least two optical fibers enters different positions of the lens assembly through the polarizer and reaches an object to be detected, the light emitted from the at least two optical fibers is parallel, light reflected by the object to be detected enters the camera at least through the lens assembly and the polarization analyzer, and the camera is a color camera.

Description

Technical Field

[0001] The present invention relates to the field of magnetic domain imaging technology, and in particular to a light source coupled magnetic domain imaging device and method. Background Art

[0002] In the current magnetic domain imaging equipment, the detection light emitted from the light source reaches the object to be measured after passing through the polarizer, objective lens and other lens groups, and the light reflected by the object to be measured then passes through the objective lens and other lens groups and the analyzer and enters the camera, so that the camera can collect the magnetic domain image. There are the following problems:

[0003] 1) After the position of the light source is fixed, the detection light it emits can only reach the object to be measured with a fixed incident direction or incident plane. In some cases, according to the magnetic domain state of the object to be measured, it is necessary to choose to use the polar magneto-optical Kerr effect or the longitudinal magneto-optical Kerr effect to image the object to be measured. The polar magneto-optical Kerr effect requires the incident light to be irradiated perpendicularly to the object to be measured, and the longitudinal Kerr effect requires the incident light to be irradiated obliquely to the object to be measured and the incident plane of the incident light needs to be parallel to the direction of the magnetic domain to be measured. In the case of unclear magnetic domain state of the object to be measured, it is necessary to adjust the optical path of the incident light multiple times to meet the imaging requirements. The existing magnetic domain imaging equipment cannot adjust or change the incident plane or incident direction of the detection light, and cannot adapt to the different detection requirements of the object to be measured.

[0004] 2) After the position of the object to be measured is determined, the optical axis of the detection light emitted by the light source is required to be aligned with the object to be measured, and the light spot formed by the detection light is located at the measured position of the object to be measured. The light spot is usually several microns, which requires high accuracy of the optical path structure. At the same time, it also puts forward certain requirements on the position and angle of the light source, resulting in an increase in the maintenance cost of the magnetic domain imaging equipment.

[0005] 3) Current magnetic domain imaging devices mostly use a single light source and a black-and-white camera, which can only produce single-frame images. When multiple measurements of the object need to be performed, the optical path needs to be adjusted multiple times and the images need to be taken separately, resulting in a slow imaging speed. Summary of the invention

[0006] The present invention provides a light source coupled magnetic domain imaging device and method, which are used to solve at least one of the above technical problems.

[0007] The present invention adopts the following technical solutions:

[0008] On the one hand, the present invention provides a light source coupled magnetic domain imaging device, the device comprising: an optical fiber assembly connected before a polarizer, the optical fiber assembly comprising at least two optical fibers; a wavelength division multiplexer connected to the at least two optical fibers respectively; each of the wavelength division multiplexers is connected to a light source assembly respectively, each of the light source assembly comprises at least two colors of light sources; a lens assembly is at least arranged in the incident light path of the object to be measured; the light emitted from the at least two optical fibers respectively enters different positions of the lens assembly through the polarizer and reaches the object to be measured, and the light emitted from the at least two optical fibers is parallel, and the light reflected by the object to be measured enters the camera after at least passing through the lens assembly and the analyzer, and the camera is a color camera.

[0009] In a possible implementation of the present invention, the optical fiber assembly includes three optical fibers, and the light-emitting end faces of the three optical fibers are arranged in an L shape.

[0010] On the other hand, the present invention also provides a light source coupled magnetic domain imaging method, which uses a light source coupled magnetic domain imaging device as described above, and the method includes: controlling at least two of the light sources to emit light, and the colors of the light sources are different; the emitted light emitted by the light sources reaches the object to be measured with a preset incident surface or incident direction, using the camera to collect the reflected light of the object to be measured, so that the magnetic domain imaging device obtains an image, and performing color decomposition on the image to obtain magnetic domain images corresponding to emitted light of different colors.

[0011] In a possible implementation of the present invention, the method also includes: at least two of the light sources belong to different light source components, so that the at least two optical fibers respectively emit light of different colors, and the light emitted by the at least two optical fibers reaches the object to be measured at different incident planes or incident directions through different positions of the incident lens component, so that the magnetic domain imaging device obtains the magnetic domain image of the object to be measured under different incident planes or incident directions.

[0012] In a possible implementation of the present invention, light emitted from one of the optical fibers is incident on the lens assembly along the optical axis of the lens assembly, and light emitted from another of the optical fibers is at a preset distance from the optical axis of the lens assembly.

[0013] In a possible implementation of the present invention, the method further includes: when the light sources of the same color in different light source assemblies generate emitted light, the light emission times of the light sources are respectively within different exposure cycles of the camera.

[0014] In a possible implementation of the present invention, the method further includes: controlling all the light sources included in one of the light source assemblies to light up and generate emitted light, the emitted light passing through the corresponding wavelength division multiplexer and the corresponding optical fiber; the emitted light reaches the object to be measured with the same incident surface and incident direction.

[0015] In a possible implementation of the present invention, the light source assembly includes light sources of three colors.

[0016] In a possible implementation of the present invention, when the optical fiber assembly includes three optical fibers whose light-emitting end faces are arranged in an L shape, the magnetic domain imaging device includes three light source assemblies, and each of the light source assemblies includes light sources of three colors, and the method further includes: making the light emitted from the optical fiber located at the L-shaped corners of the three optical fibers enter the lens assembly along the optical axis of the lens assembly, and the light emitted from the remaining optical fibers is at a preset distance from the optical axis of the lens assembly; controlling one of the light sources in each of the light source assemblies to light up, the colors of the light sources that light up in each of the light source assemblies are different, and the emitted light is transmitted through the corresponding wavelength division multiplexer and the corresponding optical fiber.

[0017] In a possible implementation of the present invention, the light emission time of at least two light sources of different colors is at least partially within an exposure cycle of the camera.

[0018] The present invention provides a light source coupled magnetic domain imaging device and method, which has the following beneficial effects:

[0019] When light sources of different colors in the light source assembly of the magnetic domain imaging device of the present invention are turned on, the detection light emitted by the optical fibers corresponding to the different light source assemblies is incident on different positions of the lens assembly, thereby changing the incident surface or incident direction of the detection light incident on the object to be measured, so that the magnetic domain imaging device can meet different detection requirements of the object to be measured. At the same time, the light source assembly is implemented by multiple groups of three-color LED lights, which is low in cost. After the position of the optical fiber assembly is fixed, the position of the light source assembly can be placed or changed arbitrarily, which reduces the maintenance cost of the optical path structure and also reduces the detection accuracy of the optical path structure. By performing color decomposition on the image obtained by the camera to obtain the magnetic domain images of the object to be measured under different colors / wavelengths, the color / wavelength with better imaging effect is analyzed, and the subsequent imaging method is optimized, so that multiple magnetic domain images can be obtained by one exposure, meeting the detection requirements of different magnetic domains. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0021] Figure 1 A light path structure diagram of a light source coupled magnetic domain imaging device provided by the present invention;

[0022] Figure 2 A flow chart of a light source coupled magnetic domain imaging method provided by the present invention;

[0023] Figure 3 A schematic diagram of changing the incident direction of an object to be measured provided by the present invention.

[0024] in:

[0025] 101. Light source assembly; 1011. Red LED light; 1012. Blue LED light; 1013. Green LED light; 102. Wavelength division multiplexer; 103. Optical fiber assembly; 104. Polarizer; 105. Lens assembly; 106. Object to be measured; 107. Analyzer; 108. Camera; 109. Spectroscope; 110. Control / processor; 301. Detection light. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0027] The method of the present invention is described in detail below with reference to the accompanying drawings.

[0028] Figure 1 The optical path structure diagram of a magnetic domain imaging device coupled with a light source provided by the present invention is as follows: Figure 1 As shown, the magnetic domain imaging device in the present invention at least includes:

[0029] The light source assembly 101 is used to provide detection light for the magnetic domain imaging device. Figure 1Multiple groups of LED lights are shown in the figure, with the LED lights as the light sources and the light emitted by the light sources as the emitted light; the LED lights connected to the same wavelength division multiplexer 102 are regarded as a group, constituting a light source assembly 101, and each light source assembly 101 includes three-color LED lights, namely a red LED light 1011, a blue LED light 1012 and a green LED light 1013.

[0030] The wavelength division multiplexer 102 is connected to the light source assembly 101 and is used to multiplex the light emitted by the light source in the light source assembly 101 to synthesize a beam of light. According to the on and off of the three-color LED lamp, the synthesized light can be either monochromatic light, multi-color composite light, or white light. Figure 1 A light source assembly 101 composed of a group of three-color LED lamps is correspondingly connected to a wavelength division multiplexer 102 .

[0031] The optical fiber assembly 103 is composed of N optical fibers bundled together. To ensure that the detection light 301 can reach the object 106 with different incident directions or incident planes, the value of N is limited to be greater than or equal to 2. Figure 1 The optical fiber assembly 103 is composed of five optical fibers, the light-emitting end faces of the optical fiber assembly 103 are arranged in a cross shape, and the five optical fibers are respectively connected to a one-to-one corresponding wavelength division multiplexer 102 , thereby connecting to each light source in each light source assembly 101 .

[0032] That is, in Figure 1 The optical path structure shown in the figure includes five light source components 101, each of which includes a three-color LED lamp as a light source, and each of the three-color LED lamps of the light source component 101 is connected to a wavelength division multiplexer 102, each of which is connected to an optical fiber in the optical fiber component 103, and a total of five wavelength division multiplexers 102 receive light emitted by five groups of three-color LED lamps, and transmit light emitted by corresponding three-color LED lamps.

[0033] The lens assembly 105 is arranged in front of the object to be measured 106, and the detection light 301 passes through the lens assembly 105 and irradiates the object to be measured 106. The detection lights 301 emitted by different optical fibers are parallel to each other. Usually, the lens assembly 105 converges the detection light 301 to the measured position of the object to be measured 106, or the measured surface of the object to be measured 106 is located on the focal plane of the lens assembly 105.

[0034] Camera 108, the light reflected by the object 106 enters the camera 108 after passing through the lens assembly 105, the beam splitter 109 and the analyzer 107, so that the camera 108 outputs a corresponding signal according to the received light to obtain a corresponding image. Camera 108 is a color camera that can receive light of multiple colors and output corresponding signals.

[0035] like Figure 1As shown, a control / processor 110 is also provided in the optical path structure, which is mainly connected to the light source assembly 101 and the camera 108, and is used to control the cooperation between the two devices during the magnetic domain imaging process, especially to control the relationship between the exposure period of the camera 108 and the light emission time of the light source in the light source assembly 101. The specific control process can be found in the method embodiment and related descriptions, and this embodiment will not be repeated here.

[0036] In addition, the optical path structure also includes Figure 1 In the polarizer 104 and the analyzer 107, the polarizer 104 is arranged in the incident light path of the object 106 to be measured, and the analyzer 107 is arranged in the reflected light path of the object 106 to be measured, and their positions or orders are not limited.

[0037] In the above optical path structure, the three-color LED lamp, the wavelength division multiplexer 102, the optical fiber assembly 103, the polarizer 104, and the lens assembly 105 constitute the incident optical path of the object to be measured 106, and the lens assembly 105, the polarizer 107, and the camera 108 constitute the reflected optical path of the object to be measured 106, that is, the detection light 301 emitted by the three-color LED lamp is converted into polarized light after passing through the wavelength division multiplexer 102, the optical fiber assembly 103, and the polarizer 104, and the polarized light reaches the object to be measured 106 through the lens assembly 105, and the light reflected by the object to be measured 106 passes through the lens assembly 105 and enters the camera 108 through the polarizer 107, so that the camera 108 collects the corresponding image.

[0038] It should be noted that Figure 1 The optical path structure shown is only an exemplary description of this embodiment and is not used to limit the specific optical path structure. In actual use, the composition of the light source assembly 101, the number of optical fibers of the optical fiber assembly 103, and the optical devices in the optical path structure can be replaced or adjusted according to actual imaging requirements. For example, in some cases, a beam splitter 109 can be further provided so that the detection light enters the lens assembly 105 after passing through the beam splitter 109, and the reflected light enters the analyzer 107 after passing through the lens assembly 105 and the beam splitter 109; in addition, other optical elements can be added or existing optical elements can be adjusted according to the needs of optical path adjustment, which will not be repeated here.

[0039] based on Figure 1 The optical path structure shown in the figure, the magnetic domain imaging method in the present invention at least includes the following execution steps:

[0040] Step 201: Control at least two light sources to emit light in a preset manner, and the colors of the light sources are different.

[0041] Step 202: the emitted light from the light source reaches the object to be measured at a preset incident surface or incident direction, a camera is used to collect reflected light from the object to be measured, a magnetic domain imaging device obtains an image, and the image is decomposed into colors to obtain magnetic domain images corresponding to emitted light of different colors.

[0042] After the light source assembly 101 emits the emission light, the emission light is combined by the corresponding wavelength division multiplexer 102 to form the detection light and propagates along the corresponding optical fiber, so that the detection light is incident on the object to be measured 106 after passing through the polarizer 104 and the lens assembly 105, and the light reflected from the object to be measured 106 enters the camera 108 after passing through the lens assembly 105 and the analyzer 107, so that the camera 108 obtains the magnetic domain image. In this process, by controlling the corresponding light sources of different light source assemblies 101 to emit or not emit light and propagate along different optical fibers, on the basis of the parallel light of the outgoing optical fiber, the detection light can be incident on different positions of the lens assembly 105, and finally reach the object to be measured 106 with different incident surfaces or incident directions, so as to meet different detection requirements for the object to be measured 106. Figure 3 (a) and Figure 3 As shown in (b), the detection light emitted from the light-emitting surface of the optical fiber enters different positions of the lens assembly 105 and reaches the object to be measured 106 in different incident directions. Figure 3 The detection light in (a) enters the left side of the lens assembly 105 and reaches the object 106 from the left side of the central axis of the object 106. Figure 3 The detection light in (b) is incident on the right side of the lens assembly 105, and reaches the object 106 from the right side of the central axis of the object 106. The positions of the corresponding detection light incident on the lens assembly 105 can be different by different positions of the optical fiber light emitting surface, so that the detection light reaches the object 106 in different incident directions. In addition, when the detection light is incident on the lens assembly 105 along the optical axis of the lens assembly 105, the detection light will be irradiated to the object 106 in a direction perpendicular to the object 106.

[0043] In one example, based on Figure 1 The optical path structure shown in (there are 5 groups of three-color LED lights as light sources, each group of three-color LED lights as a light source component 101, and a wavelength division multiplexer 102 is connected to each group, which can combine the emission lights emitted by multiple three-color LED lights in the same group into one beam of light as detection light), through the control / processor 110 to control the light emission mode of the three-color LED lights, can achieve:

[0044] The image obtained by the camera 108 is decomposed to obtain the magnetic domain images corresponding to the emission lights of different colors: each group of three-color LED lights in each light source assembly 101 is controlled to light up at least two LED lights and make the colors of the lighted LED lights different. The illuminated LED lights generate emission light, which passes through the corresponding wavelength division multiplexer 102 and forms detection light. The detection light is transmitted through the corresponding optical fiber and irradiates the lens assembly 105 and then reaches the object to be measured 106. The light reflected from the object to be measured 106 passes through the lens assembly 105 and the analyzer 107 and enters the camera 108 to obtain the corresponding image, and then the corresponding image is decomposed by color to obtain the magnetic domain images of the object to be measured 106 at different colors / wavelengths.

[0045] For example, the first group of three-color LED lights is controlled to light up the red LED light, the second group of three-color LED lights is controlled to light up the blue LED light, and the third group of three-color LED lights is controlled to light up the green LED light; accordingly, the emission light emitted by the red LED light is transmitted to the corresponding optical fiber through the wavelength division multiplexer 102 correspondingly connected to the first group of three-color LED lights, and is transmitted to the lens assembly 105 through the corresponding light-emitting end surface, so that the light generated by the red LED light enters the first position of the lens assembly 105 and reaches the object to be measured 106 with the first incident surface or incident direction; the emission light emitted by the blue LED light is transmitted to the object to be measured 106 through the second group of three-color LED lights. The wavelength division multiplexer 102 to be connected is transmitted to the corresponding optical fiber, and is transmitted to the lens assembly 105 through the corresponding light-emitting end face, so that the light generated by the blue LED lamp is incident on the second position of the lens assembly 105, and reaches the object to be measured 106 with the second incident plane or incident direction; the emission light emitted by the green LED lamp is transmitted to the corresponding optical fiber through the wavelength division multiplexer 102 correspondingly connected to the third group of three-color LED lamps, and is transmitted to the lens assembly 105 through the corresponding light-emitting end face, so that the light generated by the green LED lamp is incident on the third position of the lens assembly 105, and reaches the object to be measured 106 with the third incident plane or incident direction. The light reflected by the object to be measured 106 enters the camera 108 after passing through the lens assembly 105 and the analyzer 107, so that the camera 108 collects the corresponding image. The image collected by the camera 108 is subjected to color decomposition. Since the incident planes or incident directions corresponding to the three colors / wavelengths of light are different, the magnetic domain images under the three colors / wavelengths obtained by decomposition are the magnetic domain images of the object to be measured 106 under three different incident planes or incident directions. The camera 108 can obtain multiple magnetic domain images under different incident planes or incident directions in one shot.

[0046] For another example, the first group of three-color LED lights is controlled to light up the red LED light 1011, the blue LED light 1012, and the green LED light 1013. Accordingly, the emission light emitted by the red LED light 1011, the blue LED light 1012, and the green LED light 1013 is combined into a beam of detection light through the wavelength division multiplexer 102 correspondingly connected to the first group of three-color LED lights, transmitted to the corresponding optical fiber, and transmitted to the lens assembly 105 through the corresponding light-emitting end surface, so that the light generated by the red LED light 1011, the blue LED light 1012, and the green LED light 1013 is incident on the first position of the lens assembly 105, and reaches the object to be measured 106 with the first incident surface or incident direction. The light reflected by the object to be measured 106 enters the camera 108 after passing through the lens assembly 105 and the analyzer 107, so that the camera 108 collects the corresponding image. The image collected by the camera is subjected to color decomposition. Since the incident plane or incident direction corresponding to the three colors / wavelengths of light is the same, the magnetic domain images under the three colors / wavelengths obtained by decomposition are the magnetic domain images of the object 106 under the three colors / wavelengths and the same incident plane or incident direction. The camera 108 can obtain multiple magnetic domain images with different colors and the same incident plane or incident direction in one shot.

[0047] In addition, the first group of three-color LED lights can be controlled to light up the red LED lights 1011 and the blue LED lights 1012. Accordingly, the emission lights emitted by the red LED lights 1011 and the blue LED lights 1012 are combined into a beam of detection light through the wavelength division multiplexer 102 correspondingly connected to the first group of three-color LED lights, and are transmitted to the corresponding optical fiber, and are transmitted to the lens assembly 105 through the corresponding light-emitting end face, so that the light generated by the red LED lights 1011 and the blue LED lights 1012 enter the first position of the lens assembly 105 and reach the object to be measured 106 with the first incident plane or incident direction. The second group of three-color LED lights can be controlled to light up the green LED lights. Accordingly, the emission lights emitted by the green LED lights are transmitted to the corresponding optical fiber through the wavelength division multiplexer 102 correspondingly connected to the second group of three-color LED lights as a beam of detection light, and are transmitted to the corresponding optical fiber, and are transmitted to the lens assembly 105 through the corresponding light-emitting end face, so that the light generated by the green LED lights enter the second position of the lens assembly 105 and reach the object to be measured 106 with the second incident plane or incident direction. The light reflected by the object 106 enters the camera 108 after passing through the lens assembly 105 and the analyzer 107, so that the camera 108 collects the corresponding image. The image collected by the camera is subjected to color decomposition. Since the incident plane or incident direction corresponding to the red and blue lights is the same, and the incident plane or incident direction corresponding to the red and green lights and the blue and green lights is different, the magnetic domain images under the three colors / wavelengths obtained by decomposition are the magnetic domain images of the object 106 under the first incident plane or incident direction under two colors / wavelengths, and the magnetic domain image of the object 106 under the second incident plane or incident direction under one color / wavelength.

[0048] According to the concept of this solution, corresponding combinations can be made to meet corresponding detection requirements.

[0049] When the LED lights that light up have different colors, the LED lights that light up can be lit at different times or at the same time. The light source generates emission light, which passes through the wavelength division multiplexer 102 and enters the corresponding optical fiber to be transmitted as detection light. The wavelength division multiplexer 102 is used to combine the light emitted by each light source in the same light source assembly 101 into one beam as detection light. For the light emitted by light sources of different colors, the emission time of the corresponding light source is at least partially within an exposure cycle of the camera 108, so that a single image obtained by shooting with the camera 108 is subjected to color decomposition to obtain multiple magnetic domain images.

[0050] When the light sources of the same color in different light source assemblies 101 light up at different times to generate emitted light, the light emission times of the light sources are respectively located in different exposure cycles of the camera 108 to avoid the camera simultaneously obtaining images of the object under the same color light, thereby avoiding the situation where the detection light generated by different light source assemblies 101 cannot be distinguished.

[0051] For example, it is assumed that the first group of three-color LED lights is controlled to light up the red LED light first, and then the second group of three-color LED lights is controlled to light up the red LED light, respectively generating red emission light, which is transmitted to the corresponding optical fiber through the wavelength division multiplexer 102 connected to the first group and the second group of three-color LED lights respectively, so that the detection light enters the first position and the second position of the lens component 105, and reaches the object to be measured 106 with the first incident direction or incident plane and the second incident direction or incident plane. The light reflected by the object to be measured 106 enters the camera 108 after the lens component 105 and the polarizer 107, so that the camera 108 collects two images respectively, corresponding to the image when the red LED light in the first group of three-color LED lights is turned on and the image when the red LED light in the second group of three-color LED lights is turned on, thereby collecting two magnetic domain images of the object to be measured 106 with the same color / wavelength and two different incident planes or incident directions.

[0052] It should be noted that the first, second and third in the aforementioned content all refer to different objects.

[0053] Through the above process, when the object to be tested 106 is tested, the light source can be controlled according to the incident direction or incident surface corresponding to the light source assembly 101, so as to change the incident surface or incident direction of the detection light incident on the object to be tested 106 through the corresponding light output end face of the optical fiber, thereby meeting different detection requirements of the object to be tested 106, and the change of different incident surfaces or incident directions can be achieved only by controlling the light emission mode of the LED lamp, and the control method is simple; the cost of the LED lamp is low, no movable mechanism or component is required in the optical path, and the overall optical path structure cost is low; at the same time, after the position of the optical fiber assembly 103 is fixed, the position of the light source assembly 101 can be changed at will, thereby reducing the maintenance cost of the optical path structure.

[0054] In addition, by using the present invention to obtain the corresponding magnetic domain image, it is possible to compare the magnetic domain images of emitted light of different colors with the same incident surface or incident direction to find out the quality of the imaging effect of the current object 106 under test when the emitted light is of a certain color; it is also possible to compare the magnetic domain images of emitted light of the same color with different incident surfaces or incident directions to meet the imaging requirements of different magnetic domains on the object 106 under test; it is also possible to piece together the magnetic domain images of different colors, different incident surfaces or incident directions to obtain a three-dimensional magnetic domain image that can reflect different magnetic domains in one picture; it is also possible to obtain a magnetic domain image with better effect based on the combination of the color, incident direction or incident surface of the emitted light with better imaging effect.

[0055] In one example, in order to detect the Kerr effect of the polar magnetic domains and in-plane magnetic domains of the object under test 106, the optical fiber component 103 in the optical path structure can include at least three optical fibers with L-shaped light-emitting end faces, and the light emitted from the optical fiber at the L-shaped corner can be vertically incident on the object under test 106. In this way, when three different colors of LED lights are turned on in three groups of three-color LED lights, the detection light reaches the object under test 106 through the correspondingly connected wavelength division multiplexer 102 and optical fiber, and the light reflected from the object under test 106 enters the color camera after passing through the lens component 105 and the polarizer 107, so that the color camera can collect three magnetic domain images of the object under test 106, two in-plane magnetic domains and one polar magnetic domain.

[0056] Of course, in this process, the three different color LED lights that need to be turned on in the three groups of LED lights (one color LED lights in each group) can be turned on at the same time, or the light-emitting time of the three different color LED lights that need to be turned on in the three groups of LED lights (one color LED lights in each group) can be at least partially within an exposure cycle of the camera 108. In this way, the color camera can also collect three magnetic domain images of the object 106 at one time, including two in-plane magnetic domains and one polar magnetic domain.

[0057] For example, the light emitted from the optical fiber located at the L-shaped corner among the three optical fibers can be incident on the lens assembly 104 along the optical axis of the lens assembly 105, so that the corresponding detection light is incident on the object to be measured 106 vertically to obtain a magnetic domain image of the polar magnetic domain; the light emitted from the remaining optical fibers is at a certain distance from the optical axis of the lens assembly 105, so that the corresponding detection light is incident on the object to be measured 106 at an angle, and the incident planes formed by the two detection lights are different, so as to obtain two magnetic domain images of in-plane magnetic domains in different directions.

[0058] Each embodiment of the present invention is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the IoT device and medium embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiments.

[0059] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0060] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0061] The above are only embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A light source coupled magnetic domain imaging device, characterized in that: The device comprises: An optical fiber assembly connected before the polarizer, the optical fiber assembly comprising at least two optical fibers; A wavelength division multiplexer connected to the at least two optical fibers respectively; Each of the wavelength division multiplexers is respectively connected to a light source assembly, and each of the light source assemblies includes light sources of at least two colors; A lens assembly disposed at least in the incident light path of the object to be measured; The light emitted from the at least two optical fibers respectively enters different positions of the lens assembly through the polarizer and reaches the object to be measured, and the light emitted from the at least two optical fibers is parallel. The light reflected by the object to be measured enters the camera after at least passing through the lens assembly and the polarizer. The camera is a color camera.

2. The light source coupled magnetic domain imaging device according to claim 1, characterized in that: The optical fiber assembly comprises three optical fibers, and the light-emitting end faces of the three optical fibers are arranged in an L shape.

3. A light source coupled magnetic domain imaging method, using a light source coupled magnetic domain imaging device as claimed in any one of claims 1 to 2, characterized in that: The method comprises: Controlling at least two of the light sources to emit light, and the colors of the light sources emitting light are different; The emitted light from the light source reaches the object to be measured through a preset incident surface or incident direction, and the camera is used to collect the reflected light from the object to be measured, so that the magnetic domain imaging device obtains an image, and the image is subjected to color decomposition to obtain magnetic domain images corresponding to emitted light of different colors.

4. The method for magnetic domain imaging by light source coupling according to claim 3, characterized in that: The method further comprises: The at least two luminous light sources belong to different light source components, so that the at least two optical fibers respectively emit light of different colors. The light emitted by the at least two optical fibers reaches the object to be measured at different incident planes or incident directions through different positions of the incident lens component, so that the magnetic domain imaging device obtains the magnetic domain image of the object to be measured under different incident planes or incident directions.

5. The method for magnetic domain imaging by light source coupling according to claim 4, characterized in that: The light emitted from one of the optical fibers is incident on the lens assembly along the optical axis of the lens assembly, and the light emitted from another of the optical fibers is at a preset distance from the optical axis of the lens assembly.

6. The method for magnetic domain imaging by light source coupling according to claim 3, characterized in that: The method further comprises: When the light sources of the same color in different light source assemblies generate emitted light, the light emission times of the light sources are respectively located in different exposure cycles of the camera.

7. The method for magnetic domain imaging by light source coupling according to claim 3, characterized in that: The method further comprises: The light sources contained in one of the light source components are controlled to light up to generate emission light, and the emission light is transmitted through the corresponding wavelength division multiplexer and the corresponding optical fiber; the emission light reaches the object to be measured with the same incident surface and incident direction.

8. The method for magnetic domain imaging by light source coupling according to claim 3, characterized in that: The light source assembly includes light sources of three colors.

9. The method for magnetic domain imaging by light source coupling according to claim 3, characterized in that: When the optical fiber assembly includes three optical fibers whose light-emitting end faces are arranged in an L shape, the magnetic domain imaging device includes three light source assemblies, and each of the light source assemblies includes light sources of three colors, and the method further includes: Make the light emitted from the optical fiber located at the L-shaped corner among the three optical fibers enter the lens assembly along the optical axis of the lens assembly, and the light emitted from the remaining optical fibers is at a preset distance from the optical axis of the lens assembly; One of the light sources in each of the light source assemblies is controlled to light up to generate emitted light, the light sources in each of the light source assemblies have different colors, and the emitted light is transmitted through the corresponding wavelength division multiplexer and the corresponding optical fiber.

10. The method for magnetic domain imaging by light source coupling according to claim 3, characterized in that: The light emission time of at least two light sources of different colors is at least partially within an exposure period of the camera.

Images