CN111982828A - Magnetic liquid concentration detection device based on longitudinal Kerr effect - Google Patents
Magnetic liquid concentration detection device based on longitudinal Kerr effect Download PDFInfo
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- CN111982828A CN111982828A CN202010897011.XA CN202010897011A CN111982828A CN 111982828 A CN111982828 A CN 111982828A CN 202010897011 A CN202010897011 A CN 202010897011A CN 111982828 A CN111982828 A CN 111982828A
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- kerr effect
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/21—Polarisation-affecting properties
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Abstract
The invention relates to the field of magnetic liquid concentration measurement, and particularly provides a magnetic liquid concentration detection device based on a longitudinal Kerr effect, which comprises: the magnetic material layer is arranged on the substrate, and concave parts are arranged on the upper surface of the magnetic material layer and are arranged periodically; when the method is applied, magnetic liquid is arranged in the concave part, linearly polarized light is applied to irradiate the magnetic material layer in an inclined mode, an external magnetic field is applied in a direction parallel to the incident surface, and the concentration of the magnetic liquid to be detected is determined by detecting the included angle between the long axis of the reflected elliptically polarized light and the incident linearly polarized light and the ratio of the long axis of the elliptically polarized light to the short axis of the elliptically polarized light. The invention has the advantages of high detection sensitivity and high detection accuracy.
Description
Technical Field
The invention relates to the field of magnetic liquid concentration detection, in particular to a magnetic liquid concentration detection device based on a longitudinal Kerr effect.
Background
The magnetic liquid is colloidal liquid formed by mixing magnetic solid particles with nanometer-scale diameters, base carrier liquid and surfactant. The magnetic liquid has both the fluidity of the liquid and the magnetism of the solid magnetic material. Has wide application in the fields of fluid sealing, shock absorption, medical appliances, sound regulation, light display and the like. Magnetic liquid concentration measurement is an important link of magnetic liquid application. The sensitivity of the traditional magnetic liquid concentration measurement is low. The research and development of the magnetic liquid concentration measuring device based on a new principle has important significance for the application of the magnetic liquid.
Disclosure of Invention
In order to solve the above problems, the present invention provides a magnetic liquid concentration detecting apparatus based on the longitudinal kerr effect, comprising: the magnetic material layer is arranged on the substrate, and concave parts are arranged on the upper surface of the magnetic material layer and are arranged periodically; when the method is applied, magnetic liquid is arranged in the concave part, linearly polarized light is applied to irradiate the magnetic material layer in an inclined mode, an external magnetic field is applied in a direction parallel to the incident surface, and the concentration of the magnetic liquid to be detected is determined by detecting the included angle between the long axis of the reflected elliptically polarized light and the incident linearly polarized light and the ratio of the long axis of the elliptically polarized light to the short axis of the elliptically polarized light.
Further, the recess is cylindrical.
Further, the recess penetrates the magnetic material layer.
Further, the concave portions are arranged in a square cycle.
Further, the recess is a groove.
Further, the cross-section of the groove is wedge-shaped.
Further, the groove penetrates the magnetic material layer.
Further, the material of the substrate is a non-magnetic material.
Further, the material of the substrate is silicon dioxide.
Further, the material of the magnetic material layer is cobalt, bismuth iron garnet.
The invention has the beneficial effects that: the invention provides a magnetic liquid concentration detection device based on longitudinal Kerr effect, which comprises: the magnetic material layer is arranged on the substrate, and concave parts are arranged on the upper surface of the magnetic material layer and are arranged periodically; when the method is applied, magnetic liquid is arranged in the concave part, linearly polarized light is applied to irradiate the magnetic material layer in an inclined mode, an external magnetic field is applied in a direction parallel to the incident surface, and the concentration of the magnetic liquid to be detected is determined by detecting the included angle between the long axis of the reflected elliptically polarized light and the incident linearly polarized light and the ratio of the long axis of the elliptically polarized light to the short axis of the elliptically polarized light. In the invention, under the action of an external magnetic field, the magnetic liquid generates magnetism, and the magnetic field at the position of the magnetic material layer is changed, so that the Kerr effect of the magnetic material layer is changed. The present invention has the advantage of high detection sensitivity because the kerr effect is very sensitive to the magnetic field at the magnetic material layer. In addition, the change of the magnetic liquid to be detected to the Kerr effect is determined from the included angle between the long axis of the reflected elliptical polarized light and the incident linear polarized light and the ratio of the long axis to the short axis of the reflected elliptical polarized light, and the method has the advantage of high detection accuracy.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic diagram of a magnetic liquid concentration detection device based on the longitudinal kerr effect.
Fig. 2 is a schematic diagram of another magnetic liquid concentration detection device based on the longitudinal kerr effect.
In the figure: 1. a substrate; 2. a magnetic material layer; 3. a recess.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the intended purpose, the following detailed description of the embodiments, structural features and effects of the present invention will be made with reference to the accompanying drawings and examples.
Example 1
The invention provides a magnetic liquid concentration detection device based on a longitudinal Kerr effect. As shown in fig. 1, the magnetic liquid concentration detecting apparatus based on the longitudinal kerr effect includes a substrate 1 and a magnetic material layer 2, and the magnetic material layer 2 is disposed on the substrate 1. The material of the substrate 1 is a non-magnetic material. Further, the material of the substrate 1 is silicon dioxide. The material of the magnetic material layer 2 is a magnetic material. Preferably, the material of the magnetic material layer 2 is cobalt, bismuth iron garnet. The upper surface of the magnetic material layer 2 is provided with a recess 3, and the recess 3 is cylindrical. That is, a concave pit is formed on the upper surface of the magnetic material layer 2 for disposing the magnetic liquid to be measured. The recesses 3 are arranged periodically. Specifically, the recesses 3 are arranged in a square periodic array. In application, the recesses 3 may also be rectangular in period.
When the device is applied, magnetic liquid to be measured is arranged in the concave part 3; applying an external magnetic field in a direction parallel to the incident plane, that is, the direction of the external magnetic field is along the horizontal direction in fig. 1; the magnetic material layer 2 is irradiated obliquely with linearly polarized light. Preferably, the angle of incidence is greater than 45 degrees to produce a stronger kerr effect. The reflected light is detected using a detector. The reflected light is elliptically polarized light due to the kerr effect produced by the device. When the concentrations of the magnetic liquids to be detected are different, the directions of the long axis of the elliptically polarized light and the incident linearly polarized light are different, and the ratios of the long axis to the short axis of the elliptically polarized light are different. And determining the concentration of the magnetic liquid to be detected by detecting the included angle between the long axis of the reflected elliptically polarized light and the incident linearly polarized light and the ratio of the long axis to the short axis of the elliptically polarized light.
In the present invention, under the action of the external magnetic field, the magnetic liquid generates magnetism, and changes the magnetic field at the position of the magnetic material layer 2, thereby changing the kerr effect of the magnetic material layer 2. The different concentrations of the magnetic liquid produce different changes in the magnetic field at the location of the layer 2 of magnetic material, resulting in a kerr effect of different strengths. The present invention has the advantage of high detection sensitivity because the kerr effect is very sensitive to the magnetic field at the magnetic material layer 2. In addition, the change of the magnetic liquid to be detected to the Kerr effect is determined from the included angle between the long axis of the reflected elliptical polarized light and the incident linear polarized light and the ratio of the long axis to the short axis of the reflected elliptical polarized light, and the method has the advantage of high detection accuracy.
Further, the recess 3 penetrates the magnetic material layer 2. This enables more magnetic liquid to be provided, which has more influence on the magnetic field at the magnetic material layer 2, and improves the sensitivity of magnetic liquid concentration detection. In addition, the change in the magnetic liquid concentration changes the magnetic field at the magnetic material layer 2 more due to the blocking effect of the concave portion 3, thereby further improving the sensitivity of magnetic liquid concentration detection.
Example 2
In example 1, as shown in fig. 2, the recess 3 is a groove having a wedge-shaped cross section, and the groove penetrates the magnetic material layer. In use, incident light is incident in a direction perpendicular to the grooves. With this structure, that is, at the bottom of the magnetic material layer 2, the magnetic materials on both sides of the groove are close to each other, forming a narrow slit. In this way, at the bottom of the wedge-shaped groove, the concentration of the magnetic liquid in the narrow slit more drastically changes the magnetic field in the magnetic material on both sides, thereby more drastically changing the kerr effect of the magnetic material layer, and thus improving the sensitivity of magnetic liquid concentration detection. In addition, the wedge-shaped groove facilitates the placement of the magnetic liquid to be measured therein during application. In addition, the structure can gather incident light in the wedge-shaped groove, gather more energy in the wedge-shaped groove, and enhance the action of the incident light and the magnetic material layer 2, so that the Kerr effect strength of the device is improved, and finally the sensitivity of magnetic liquid concentration detection is improved.
Further, a noble metal layer is provided on the substrate 1, and the magnetic material layer 2 is provided on the noble metal layer. The material of the noble metal layer is gold, silver or platinum. Preferably, the material of the noble metal layer is gold. The noble metal layer has good emission coefficient and good surface plasmon resonance characteristics, so that on one hand, the noble metal layer can gather a stronger electric field in the wedge-shaped groove to enhance the action of incident light and the magnetic material layer 2; on the other hand, under excitation of incident light, surface plasmon polaritons are formed on the noble metal layer, thereby forming a strong electric field on the lower surface of the magnetic material layer 2. Both effects enhance the kerr effect of the device, and the kerr effect changes more when the concentration of the magnetic liquid changes, thereby realizing the detection of the concentration of the magnetic liquid with higher sensitivity.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (10)
1. A magnetic liquid concentration detection device based on longitudinal Kerr effect, comprising: the magnetic material layer is arranged on the substrate, and concave parts are arranged on the upper surface of the magnetic material layer and are periodically arranged; when the device is applied, magnetic liquid is arranged in the concave part, linearly polarized light is applied to irradiate the magnetic material layer in an inclined mode, an external magnetic field is applied in the direction parallel to the incident surface, and the concentration of the magnetic liquid to be measured is determined by detecting the included angle between the long axis of the reflected elliptically polarized light and the incident linearly polarized light and the ratio of the long axis of the elliptically polarized light to the short axis of the elliptically polarized light.
2. The magnetic liquid concentration detecting device based on the longitudinal kerr effect as claimed in claim 1, wherein: the recess is cylindrical.
3. The magnetic liquid concentration detecting device based on the longitudinal kerr effect as claimed in claim 2, wherein: the recess penetrates the magnetic material layer.
4. The magnetic liquid concentration detecting device based on the longitudinal kerr effect as claimed in claim 3, wherein: the concave parts are arranged in a square periodic mode.
5. The magnetic liquid concentration detecting device based on the longitudinal kerr effect as claimed in claim 1, wherein: the recess is a groove.
6. The magnetic liquid concentration detecting device based on the longitudinal kerr effect as claimed in claim 5, wherein: the cross-section of the groove is wedge-shaped.
7. The magnetic liquid concentration detecting device based on the longitudinal kerr effect as claimed in claim 6, wherein: the groove penetrates through the magnetic material layer.
8. The magnetic liquid concentration detecting device based on the longitudinal kerr effect as claimed in any one of claims 1 to 7, wherein: the material of the substrate is a non-magnetic material.
9. The magnetic liquid concentration detecting device based on the longitudinal kerr effect as claimed in claim 8, wherein: the substrate is made of silicon dioxide.
10. The magnetic liquid concentration detecting device based on the longitudinal kerr effect as claimed in claim 9, wherein: the magnetic material layer is made of cobalt, bismuth iron garnet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010897011.XA CN111982828A (en) | 2020-08-31 | 2020-08-31 | Magnetic liquid concentration detection device based on longitudinal Kerr effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010897011.XA CN111982828A (en) | 2020-08-31 | 2020-08-31 | Magnetic liquid concentration detection device based on longitudinal Kerr effect |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111982828A true CN111982828A (en) | 2020-11-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010897011.XA Withdrawn CN111982828A (en) | 2020-08-31 | 2020-08-31 | Magnetic liquid concentration detection device based on longitudinal Kerr effect |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111982828A (en) |
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2020
- 2020-08-31 CN CN202010897011.XA patent/CN111982828A/en not_active Withdrawn
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Application publication date: 20201124 |
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| WW01 | Invention patent application withdrawn after publication |