CN111256892B - Fluorescence-based shear force detector and system - Google Patents
Fluorescence-based shear force detector and system Download PDFInfo
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- CN111256892B CN111256892B CN202010213434.5A CN202010213434A CN111256892B CN 111256892 B CN111256892 B CN 111256892B CN 202010213434 A CN202010213434 A CN 202010213434A CN 111256892 B CN111256892 B CN 111256892B
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- shear force
- metal
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- metal disc
- hole
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- 229910052751 metal Inorganic materials 0.000 claims abstract description 130
- 239000002184 metal Substances 0.000 claims abstract description 130
- 239000013013 elastic material Substances 0.000 claims abstract description 59
- 238000001514 detection method Methods 0.000 claims abstract description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 30
- 239000000758 substrate Substances 0.000 claims description 29
- 239000000377 silicon dioxide Substances 0.000 claims description 14
- 235000012239 silicon dioxide Nutrition 0.000 claims description 13
- 229910000510 noble metal Inorganic materials 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 4
- 239000013536 elastomeric material Substances 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims description 3
- 230000005672 electromagnetic field Effects 0.000 abstract description 21
- 238000010008 shearing Methods 0.000 abstract description 21
- 230000009471 action Effects 0.000 abstract description 6
- 230000003313 weakening effect Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 9
- 238000005259 measurement Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 229910052814 silicon oxide Inorganic materials 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
Abstract
The invention relates to a fluorescence-based shear force detector and a fluorescence-based shear force detection system, and mainly relates to the field of shear force detection devices. When the shearing force detector based on fluorescence measures the shearing force, incident light is used for being incident along the direction of the second metal disc, a chiral electromagnetic field is generated between the first metal disc and the second metal disc, the shearing force acts on two sides perpendicular to the hole direction of the elastic material layer, the elastic material layer is made of elastic materials, the elastic material layer deforms under the action of the shearing force, namely the hole deforms in the direction perpendicular to the center line direction of the hole, the chiral electromagnetic field between the first metal disc and the second metal disc is weakened, fluorescent molecules are filled in the hole, fluorescent signals generated by the fluorescent molecules are weakened under the condition that the chiral electromagnetic field is weakened, and the shearing force can be calculated through detection of the weakening condition of the fluorescent signals.
Description
Technical Field
The invention relates to the field of shearing force detection devices, in particular to a shearing force detector and a shearing force system based on fluorescence.
Background
The shearing force is a relative dislocation deformation phenomenon which occurs to the cross section of the material along the action direction of the external force under the action of a pair of transverse external forces which are close to each other, have the same size and point at opposite directions. Forces that can cause shear deformation of a material are referred to as shear forces or shear forces. The cross section where shear deformation occurs is called the shear plane.
In the prior art, the shear force measurement is mainly completed by a strain measurement method, but the method is only suitable for an elastic rod structure with local strain at a support seat convenient to measure, and the measuring equipment comprises: the device is applyed to top load, foil gage, wire, data acquisition terminal. The strain gauges are attached to two sides of the rod piece at the support and connected to the data acquisition terminal through a lead. Firstly, calibrating to obtain a stress-strain curve: a horizontal known force is applied to the structure, and the stress at the support is measured through the strain gauge. A plurality of groups of data are collected and fitted to obtain a horizontal force-strain curve. And secondly, carrying out an actual power test, measuring the strain at the support, and reversely solving the horizontal force according to a horizontal force-strain curve, namely the horizontal support shearing force in the direction.
However, the method is complex, and the shearing force result obtained by a horizontal force-strain curve diagram is not high in precision and is easy to have certain human errors.
Disclosure of Invention
The invention aims to provide a fluorescence-based shear force detector and a fluorescence-based shear force system aiming at the defects in the prior art, so as to solve the problems that the method in the prior art is complex, the shear force result is obtained by a horizontal force-strain curve graph, the precision is not high, and certain human errors are easy to exist.
In order to achieve the above purpose, the embodiment of the present invention adopts the following technical solutions:
in a first aspect, the present application provides a fluorescence-based shear force detector comprising: the fluorescent lamp comprises a substrate, an elastic material layer, a plurality of first metal discs, a plurality of second metal discs and fluorescent molecules; the elastic material layer is arranged on one side of the substrate, a plurality of holes perpendicular to the substrate are formed in the elastic material layer, a first metal disc is arranged at one end, close to the substrate, of each hole, a second metal disc is arranged at the other end of each hole, fluorescent molecules are filled between the first metal disc and the second metal disc in each hole, perpendicular bisectors of the first metal disc and the second metal disc in each hole are the same straight line, and the elastic material layer is made of elastic materials.
Optionally, the shear force detector further comprises a silicon dioxide layer, the silicon dioxide layer is disposed on a side of the elastic material layer away from the substrate, and isolates the fluorescent molecules from the second metal disk.
Optionally, the shear force detector further comprises a silicon dioxide layer disposed on a side of the elastic material layer away from the substrate and covering the second metal disc and the fluorescent molecules in the hole.
Optionally, the second metal disc is circular in shape.
Optionally, the first metal disc and the second metal disc are disc-shaped, and the centers of circles of the first metal disc and the second metal disc are on the same straight line.
Optionally, the diameter of the second metal disc is smaller than the diameter of the first metal disc.
Optionally, the first metal plate and the second metal plate are both made of noble metal materials.
Optionally, the depth of the hole in the elastic material layer is less than or equal to the thickness of the elastic material layer.
In a second aspect, the present application also provides a fluorescence-based shear force detection system, the system comprising: a spectrometer and the fluorescence-based shear force detector of any of the first to fourth aspects, the spectrometer being for detecting a fluorescence signal emitted by a fluorescent molecule of the shear force detector.
The invention has the beneficial effects that:
the elastic material layer is arranged on one side of the substrate, the elastic material layer is provided with a plurality of holes perpendicular to the substrate, one end of each hole close to the substrate is provided with a first metal disc, the other end of each hole is provided with a second metal disc, fluorescent molecules are filled between the first metal disc and the second metal disc in each hole, and the perpendicular bisectors of the first metal disc and the second metal disc in each hole are the same straight line, wherein the elastic material layer is made of an elastic material, when the shearing force is measured, incident light is used for incidence along the direction of the second metal disc, a chiral electromagnetic field is generated between the first metal disc and the second metal disc, and acts on two sides perpendicular to the direction of the holes of the elastic material layer, and the elastic material layer deforms under the action of the shearing force because the elastic material layer is made of the elastic material, the holes are deformed in the direction perpendicular to the center line of the holes, the chiral electromagnetic field between the first metal disc and the second metal disc is weakened, fluorescent molecules are filled in the holes, fluorescent signals generated by the fluorescent molecules are weakened under the condition that the chiral electromagnetic field is weakened, the shearing force can be calculated through detecting the weakening condition of the fluorescent signals, the measurement of the shearing force is converted into the detection of optical signals, and the measurement of the shearing force is simpler and more accurate.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic diagram of a fluorescence-based shear force detector according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another fluorescence-based shear force detector provided by an embodiment of the invention;
FIG. 3 is a waveform diagram of a fluorescence-based shear force detector provided by an embodiment of the invention;
FIG. 4 is a schematic structural diagram of another fluorescence-based shear force detector provided by an embodiment of the invention.
Icon: 10-a substrate; 20-a layer of elastomeric material; 30-a first metal disc; 40-a second metal disc; 50-fluorescent molecules; 60-silicon dioxide layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiment is a metal plate embodiment of the present invention, and not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In order to make the implementation of the present invention clearer, the following detailed description is made with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a fluorescence-based shear force detector according to an embodiment of the present invention, and as shown in fig. 1, the present application provides a fluorescence-based shear force detector, where the shear force detector includes: a substrate 10, an elastic material layer 20, a plurality of first metal disks 30, a plurality of second metal disks 40, and fluorescent molecules 50; the elastic material layer 20 is disposed on one side of the substrate 10, a plurality of holes perpendicular to the substrate 10 are formed in the elastic material layer 20, a first metal disc 30 is disposed at one end of each hole close to the substrate 10, a second metal disc 40 is disposed at the other end of each hole, fluorescent molecules 50 are filled between the first metal disc 30 and the second metal disc 40 in each hole, perpendicular bisectors of the first metal disc 30 and the second metal disc 40 in each hole are the same straight line, and the elastic material layer 20 is made of an elastic material.
The elastic material layer 20 is disposed on the upper portion of the substrate 10, the elastic material layer 20 is provided with a plurality of holes, the plurality of holes are disposed perpendicular to the substrate 10, the number of the holes and the positions of the parts of the holes are not specifically limited herein according to actual requirements, the shape of the holes may be cylindrical or prismatic, correspondingly, the shape of the second metal plate 40 may be circular or square, and is not specifically limited herein, generally, the length of the side of the second metal plate 40 is equal to the circumference of the cross section of the holes, for convenience of description, the holes are cylindrical holes, the second metal plate 40 is a circular plate, for example, the fluorescent molecule 50 is disposed between the first metal plate 30 and the second metal plate 40, that is, the second metal plate 40 is disposed at the bottom of the hole, and the fluorescent molecule 50 is filled on the second metal plate 40, the first metal plate 30 is disposed on the fluorescent molecule 50, when the shear force is measured, incident light is used to be incident along the direction of the second metal plate 40, a chiral electromagnetic field is generated between the first metal plate 30 and the second metal plate 40, and the shear force is applied to two sides perpendicular to the hole direction of the elastic material layer 20, since the elastic material layer 20 is made of an elastic material, the elastic material layer 20 is deformed under the action of the shear force, that is, the hole is deformed perpendicular to the hole centerline direction, the chiral electromagnetic field between the first metal plate 30 and the second metal plate 40 is weakened, and since the hole is filled with the fluorescent molecule, the fluorescent signal generated by the fluorescent molecule 50 is weakened under the condition that the chiral electromagnetic field is weakened, and the shear force can be calculated by detecting the weakening condition of the fluorescent signal, the present application converts the measurement of the force into the detection of the optical signal, so that the measurement of the shear force is simpler and more accurate, and it should be noted that when the elastic material layer 20 of the shear force detector is subjected to the shear force, the elastic material layer 20 is deformed, that is, the hole in the elastic material layer 20 and the fluorescent molecule 50 in the hole are deflected, the hole becomes an inclined hole, when the shear force does not exist, the chiral magnetic field between the first metal plate 30 and the second metal plate 40 in the hole is the largest, the fluorescent signal is the strongest, at this time, the strongest fluorescent signal can be collected on the surface of the shear force detector, when the shear force exists at both ends of the elastic material layer 20, the hole is deformed perpendicular to the center line direction of the hole, the chiral magnetic field between the first metal plate 30 and the second metal plate 40 is weakened, and because the hole is filled with the fluorescent molecule, when the chiral electromagnetic field is weakened, the fluorescence signal generated by the fluorescent molecule 50 is also weakened, and the shearing force can be calculated by detecting the weakening condition of the fluorescence signal; in addition, when a shear force exists, the holes in the elastic material layer 20 are inclined, so that the propagation of a part of fluorescence can be blocked, further similar fluorescence signals are weakened, and the fluorescence signals are more sensitive to the change of the shear force.
Fig. 2 is a schematic structural diagram of another fluorescence-based shear force detector provided in an embodiment of the invention, as shown in fig. 2, optionally, the shear force detector further includes a silicon dioxide layer 60, where the silicon dioxide layer 60 is disposed on a side of the elastic material layer 20 away from the substrate 10 and isolates the fluorescent molecules 50 from the second metal disk 40.
The silicon dioxide layer 60 is disposed on the side of the elastic material layer 20 away from the substrate 10 and isolates the fluorescent molecules 50 from the second metal plate 40, and not only the silicon dioxide layer 60 is used to wrap the fluorescent molecules 50, so that the fluorescent molecules 50 are not polluted by the external environment, but also the silicon dioxide layer 60 limits the divergence of the chiral electromagnetic field, which is more beneficial to generating a stronger chiral electromagnetic field between the first metal plate 30 and the second metal plate 40.
Fig. 3 is a waveform diagram of a fluorescence-based shear force detector according to an embodiment of the invention, as shown in fig. 3, in practical applications, a computer is used to simulate the chiral electromagnetic fields of the first metal disk 30 and the second metal disk 40 respectively disposed on both sides of the silicon dioxide layer 60, and for convenience of explanation, here, the thickness of the first metal plate 30 and the second metal plate 40 is set to 40 nm, the radius is set to 100 nm, the distance between the first metal plate 30 and the second metal plate 40 is set to 200nm, and it can be seen that the intensity of the chiral electromagnetic field reaches a maximum of 0.93 at a wavelength of 820 nm, when a shear force is applied to the shear force detector, it is assumed that the shear force causes a certain angle to be generated between the corresponding first metal plate 30 and second metal plate 40, at 30 degrees, the chiral electromagnetic field at 820 nm is greatly reduced to 0.13. Therefore, the size of the chiral field is very dependent on the relative inclination angle between the two metal discs, and therefore, the sensitivity of the chiral electromagnetic field to the inclination angle is based on the sensitivity characteristic of the chiral electromagnetic field in the application, that is, the measurement sensitivity of the shear force detector to the shear force is high.
Fig. 4 is a schematic structural diagram of another fluorescence-based shear force detector provided by the embodiment of the invention, as shown in fig. 4, optionally, the shear force detector further includes a silicon dioxide layer 60, where the silicon dioxide layer 60 is disposed on a side of the elastic material layer 20 away from the substrate 10, and covers the second metal disc 40 and the fluorescent molecules 50 in the holes.
The silicon oxide layer is disposed on a side of the elastic material layer 20 away from the substrate 10, and covers the second metal plate 40 and the fluorescent molecules 50 in the holes, and the silicon oxide layer 60 is not only used to wrap the fluorescent molecules 50, so that the fluorescent molecules 50 are not polluted by the external environment, but also can absorb the fluorescent signal generated by the fluorescent molecules 50 and is limited below the silicon oxide layer 60, which is more beneficial to generating a stronger chiral electromagnetic field between the first metal plate 30 and the second metal plate 40 in the holes.
Alternatively, the second metal disk 40 is circular in shape.
The circular second metal disk 40 facilitates the light to enter the circular hole, couples more light into the hole in the elastomeric layer 20, and excites the vibration of the bottom first metal disk 30.
Optionally, the first metal disc 30 and the second metal disc 40 are disc-shaped, and the centers of the first metal disc 30 and the second metal disc 40 are on the same straight line.
Optionally, the diameter of the second metal disc 40 is smaller than the diameter of the first metal disc 30.
The diameter of the second metal disc 40 is smaller than the diameter of the first metal disc 30, the circle facilitating the light to enter the circular hole through this first metal disc 30, coupling more light into the hole in the elastomeric layer 20 and exciting the vibration of the bottom first metal disc 30.
Optionally, the first metal plate 30 and the second metal plate 40 are both made of noble metal materials.
The material of the first metal plate 30 and the second metal plate 40 may be gold, silver, or a mixed metal formed by combining a plurality of noble metals, and is not particularly limited herein, and if the first metal plate 30 and the second metal plate 40 are a mixed noble metal formed by combining a plurality of noble metals, the ratio of the mixed noble metals is not particularly limited.
Optionally, the depth of the hole in the elastic material layer 20 is less than or equal to the thickness of the elastic material layer 20.
The holes in the elastic material layer 20 may penetrate through the elastic material layer 20, or may only penetrate into a portion of the elastic material layer 20, and the depth of the holes is selected according to actual needs, and is not particularly limited herein.
In the application, an elastic material layer 20 is arranged on one side of a substrate 10, the elastic material layer 20 is provided with a plurality of holes perpendicular to the substrate 10, one end of each hole close to the substrate 10 is provided with a first metal disc 30, the other end of each hole is provided with a second metal disc 40, fluorescent molecules 50 are filled between the first metal disc 30 and the second metal disc 40 in each hole, and the perpendicular bisectors of the first metal disc 30 and the second metal disc 40 in each hole are the same straight line, wherein the elastic material layer 20 is made of an elastic material, when a shearing force is measured, incident light is used to be incident along the direction of the second metal disc 40, a chiral electromagnetic field is generated between the first metal disc 30 and the second metal disc 40, and the shearing force acts on two sides perpendicular to the direction of the holes of the elastic material layer 20, because the elastic material layer 20 is made of an elastic material, the elastic material layer 20 deforms under the action of shearing force, that is, the holes deform in a direction perpendicular to the center line of the holes, the chiral electromagnetic field between the first metal plate 30 and the second metal plate 40 is weakened, and since the holes are filled with fluorescent molecules, the fluorescent signals generated by the fluorescent molecules 50 are weakened under the condition that the chiral electromagnetic field is weakened, and the shearing force can be calculated by detecting the weakening condition of the fluorescent signals.
The present application further provides a fluorescence-based shear force detection system, the system comprising: a spectrometer for detecting a fluorescence signal emitted by a fluorescent molecule 50 of the shear force detector, and a fluorescence-based shear force detector as described in any of the above.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A fluorescence-based shear force detector, characterized in that the shear force detector comprises: the fluorescent lamp comprises a substrate, an elastic material layer, a plurality of first metal discs, a plurality of second metal discs and fluorescent molecules; the elastic material layer is arranged on one side of the substrate, a plurality of holes perpendicular to the substrate are formed in the elastic material layer, one end, close to the substrate, of each hole is provided with a first metal disc, the other end of each hole is provided with a second metal disc, fluorescent molecules are filled between the first metal disc and the second metal disc in each hole, the perpendicular bisectors of the first metal disc and the second metal disc in each hole are the same straight line, and the elastic material layer is made of elastic materials;
the first metal disc and the second metal disc are disc-shaped, and the circle centers of the first metal disc and the second metal disc are on the same straight line.
2. The fluorescence-based shear force detector of claim 1, further comprising a silicon dioxide layer disposed on a side of the elastomeric layer distal from the substrate and isolating the fluorescent molecules from the second metal disk.
3. The fluorescence-based shear force detector of claim 1, further comprising a silicon dioxide layer disposed on a side of the elastomeric layer away from the substrate and covering the second metal disc and the fluorescent molecules in the holes.
4. The fluorescence-based shear force detector of claim 3, wherein the second metal disk is annular in shape.
5. The fluorescence-based shear force detector of claim 1, wherein the diameter of the second metal disk is smaller than the diameter of the first metal disk.
6. The fluorescence-based shear force detector of claim 1, wherein the material of the first metal disk and the second metal disk is a noble metal material.
7. The fluorescence-based shear force detector of claim 6, wherein the depth of the hole in the layer of elastomeric material is less than or equal to the thickness of the layer of elastomeric material.
8. A fluorescence-based shear force detection system, the system comprising: a spectrometer and a fluorescence-based shear force detector as claimed in any of claims 1 to 7, the spectrometer being arranged to detect a fluorescence signal emitted by a fluorescent molecule of the shear force detector.
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| CN202010213434.5A CN111256892B (en) | 2020-03-24 | 2020-03-24 | Fluorescence-based shear force detector and system |
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| JP4168136B2 (en) * | 2002-11-11 | 2008-10-22 | 独立行政法人産業技術総合研究所 | pressure sensor |
| US9255853B2 (en) * | 2012-05-04 | 2016-02-09 | William Marsh Rice University | Non-contact strain sensing of objects by use of single-walled carbon nanotubes |
| CN105967143B (en) * | 2016-05-06 | 2017-12-08 | 陕西师范大学 | A kind of chiral metal nanostructured for realizing circular dichroism and preparation method thereof |
| CN106092906B (en) * | 2016-08-15 | 2019-01-18 | 福州大学 | A kind of circular dichroism spectra and refractometry system based on linearly polarized light incidence |
| CN107036971B (en) * | 2016-11-14 | 2019-06-25 | 四川大学 | Chiral sensing element, equipment, chiral characterizing method, concentration characterizing method |
| CN110031140B (en) * | 2019-04-26 | 2022-11-18 | 电子科技大学中山学院 | Pressure detection structure based on optical signal and use method thereof |
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