CN111308821A - Liquid crystal sensing device and preparation method thereof - Google Patents
Liquid crystal sensing device and preparation method thereof Download PDFInfo
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- CN111308821A CN111308821A CN202010278481.8A CN202010278481A CN111308821A CN 111308821 A CN111308821 A CN 111308821A CN 202010278481 A CN202010278481 A CN 202010278481A CN 111308821 A CN111308821 A CN 111308821A
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- 239000000806 elastomer Substances 0.000 claims abstract description 61
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Images
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/13718—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on a change of the texture state of a cholesteric liquid crystal
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/12—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in colour, translucency or reflectance
- G01K11/16—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in colour, translucency or reflectance of organic materials
- G01K11/165—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in colour, translucency or reflectance of organic materials of organic liquid crystals
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/133711—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by organic films, e.g. polymeric films
- G02F1/133723—Polyimide, polyamide-imide
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/13378—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation
- G02F1/133784—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation by rubbing
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Mathematical Physics (AREA)
- Liquid Crystal (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention belongs to the technical field of sensing devices, and particularly relates to a liquid crystal sensing device and a preparation method thereof. A liquid crystal sensing device, comprising: the liquid crystal display panel comprises a first transparent elastomer layer, a first liquid crystal orientation layer, a cholesteric liquid crystal layer, a second liquid crystal orientation layer, a second transparent elastomer layer and an adhesive layer. The invention monitors the temperature of the object to be monitored by utilizing the reversible temperature-sensing color-changing characteristic of the cholesteric liquid crystal, has low manufacturing cost and directly and simply feeds back the temperature of the object to be monitored.
Description
Technical Field
The invention belongs to the technical field of sensing devices, and particularly relates to a liquid crystal sensing device and a preparation method thereof.
Background
Along with the construction and development of the smart power grid, the temperature monitoring equipment of the cable is more and more intelligent. The transmission capacity of an electric transmission cable and the insulation degradation of the cable are closely related to the temperature of the cable. When the cable bears a large load or the running time is too long, the local temperature of the cable is increased due to faults, so that accidents such as disconnection, fire and the like are easy to happen, and particularly, serious hidden dangers are brought to the normal work and the safe production of a power grid at the connecting point of a lead. Through the monitoring to cable surface temperature, know the transmission capacity of cable in real time to when the safe temperature that the cable temperature exceedes to use, show specific colour early warning and instruct, thereby judge the state of circuit. The method has great significance for the intelligent and safe development of the cable.
The cholesteric liquid crystal has reversible temperature sensing color change characteristic (the temperature change interval is-100-700 ℃), complete chromatogram, high response speed (about 0.1 s) and high color resolution (0.1 ℃). This is because cholesteric liquid crystals have a helical structure, the expansion and contraction of which are greatly affected by temperature changes, different temperatures can generate different pitches, and different pitches can reflect light of different wavebands, thereby generating color changes in the whole visible light range. Generally, the pitch becomes smaller with the increase of temperature, the wavelength of the scattered light moves to short wave, and the color changes from red, orange, yellow, green to purple; the color changes from violet to red again as the temperature decreases.
The prior art does not have a sensing device with the function, so that the technical gap is created.
Disclosure of Invention
The invention aims to provide a liquid crystal sensing device and a preparation method thereof, the method utilizes the reversible temperature-sensitive color-changing characteristic of cholesteric liquid crystal, namely, the cholesteric liquid crystal has a spiral structure, the expansion and contraction of the spiral structure are greatly influenced by the temperature change, different screw pitches can be generated at different temperatures, and different screw pitches can reflect light with different wave bands, so that the color change is generated in the whole visible light range.
The problem of lack of technology is solved in order to solve the problem that no sensing device with the function exists in the prior art.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the present invention provides a liquid crystal sensor device, comprising:
a first transparent elastomeric layer;
a first liquid crystal alignment layer;
a cholesteric liquid crystal layer;
a second liquid crystal alignment layer;
a second transparent elastomeric layer; and
and an adhesive layer.
In one embodiment of the present invention, the first transparent elastomer layer is one of polydimethylsiloxane, polymethyl acrylate, silicone rubber, AB glue, ultraviolet curing glue, and the like;
in one embodiment of the present invention, the first liquid crystal alignment layer is one of a polyimide alignment layer or a photoalignment layer SD 1.
In one embodiment of the invention, the cholesteric liquid crystal layer is formed by mixing one or more nematic liquid crystals and one or more chiral agents, wherein the nematic liquid crystals can be E7, P0616A, MLC-2140, SLC-9023 and the like, the chiral agents can be S811, R811 and the like, and the temperature response interval of the cholesteric liquid crystal layer needs to cover the temperature change interval of the cable.
In one embodiment of the present invention, the second liquid crystal alignment layer is one of a polyimide alignment layer or a photo-alignment layer SD 1;
in one embodiment of the present invention, the second transparent elastomer layer is one of polydimethylsiloxane, polymethyl acrylate, silicone rubber, AB glue, ultraviolet curing glue, and the like;
in one embodiment of the present invention, the adhesive layer may be one of an AB adhesive and an ultraviolet curing adhesive.
In one embodiment of the invention, the liquid crystal sensing device may be configured to monitor cable temperature changes.
The invention provides a preparation method of a liquid crystal sensing device, which is characterized by comprising the following steps:
s1: preparing a first transparent elastomer layer;
s2: coating a first liquid crystal alignment layer on the first transparent elastomer layer;
s3: preparing a cholesteric liquid crystal solution and coating the cholesteric liquid crystal solution on the liquid crystal alignment layer to form a cholesteric liquid crystal layer;
s4, coating a second liquid crystal orientation layer on the cholesteric liquid crystal layer;
s5: coating a second transparent elastomeric layer on the second liquid crystal alignment layer; and
and S6, coating an adhesive layer on the second transparent elastomer layer.
In one embodiment of the present invention, step S1 includes:
s11: spin coating the first transparent elastomer layer mixture on a glass substrate;
s12: and standing and drying the mixed solution of the first transparent elastomer layer to form the first transparent elastomer layer.
In an embodiment of the present invention, step S2 further includes: and performing parallel rubbing treatment on the first liquid crystal alignment layer.
In one embodiment of the present invention, step S3 includes:
s31: uniformly mixing nematic liquid crystal, a chiral agent-1, a chiral agent-2 and a spacer in proportion by ultrasound to form a cholesteric liquid crystal solution;
s32, coating the cholesteric liquid crystal solution on the first transparent elastomer layer;
s33: and standing and drying the cholesteric liquid crystal solution to form a cholesteric liquid crystal layer.
In one embodiment of the present invention, step S4 further includes: and carrying out parallel rubbing treatment on the second liquid crystal alignment layer.
In one embodiment of the present invention, step S5 includes:
s51: coating the mixed solution of the second transparent elastomer layer on the second liquid crystal orientation layer;
s52: and standing and drying the mixed solution of the second transparent elastomer layer to form the first transparent elastomer layer.
S53: and packaging the first transparent elastomer layer, the first liquid crystal orientation layer, the cholesteric liquid crystal layer, the second liquid crystal orientation layer and the second transparent elastomer layer to form the liquid crystal sensing device with a sandwich-like sandwich structure.
In one embodiment of the present invention, step S6 includes: and coating an adhesive layer on the second transparent elastomer layer in a blade coating mode at room temperature.
The temperature of the monitored object can be displayed through color change, the temperature monitoring device is convenient and visual, and the sensor disclosed by the invention is similar to an adhesive tape in form and is simple to operate when in use; the preparation method is simple, the cost is low, and the preparation method has a quite positive effect on large-scale industrial use.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a liquid crystal sensor device;
FIG. 2 is a schematic view of a liquid crystal sensor device attached to an object to be measured;
FIG. 3 is a flow chart of a process for fabricating a liquid crystal sensor device;
FIG. 4 is a partial schematic view of the step S1;
FIG. 5 is a partial schematic view of the step S2;
FIG. 6 is a partial schematic view of the step S3;
FIG. 7 is a partial schematic view of the step S4;
FIG. 8 is a partial schematic view of the step S5;
FIG. 9 is a partial schematic view of the step S6;
FIG. 10 is a schematic view showing the attachment of different specifications of liquid crystal sensors to an object to be tested.
In the drawings, the components represented by the respective reference numerals are listed below:
101-substrate, first transparent elastomer layer-1, first liquid crystal orientation layer-2, cholesteric liquid crystal-3, second liquid crystal orientation layer-4, second transparent elastomer layer-5, adhesive layer-6, object to be measured-7, liquid crystal sensing device-8 with pitch-1, liquid crystal sensing device-9 with pitch-2 and liquid crystal sensing device-10 with pitch-3.
Detailed Description
The technical solutions in 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 embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
The invention discloses a liquid crystal sensing device, which displays different colors by utilizing the temperature sensitivity of the screw pitch of cholesteric liquid crystal and the change along with the temperature, wherein different temperatures correspond to different screw pitches, and different screw pitches correspond to different reflection wavelengths. The flexible liquid crystal sensing adhesive tape is adhered to the surface of an object to be detected, the temperature of the object to be detected is monitored in real time through the color displayed by the cholesteric liquid crystal, and the device has important significance for the safe use and the detection of the running state of the object to be detected, and has the advantages of convenience, intuition, low price and the like.
Referring to fig. 1-2, in the present embodiment, the liquid crystal sensor device 8 at least includes: a first transparent elastomer layer 1, a first liquid crystal alignment layer 2, a cholesteric liquid crystal layer 3, a second liquid crystal alignment layer 4, a second transparent elastomer layer 5 and an adhesive layer 6.
Specifically, in the present embodiment, the first transparent elastomer layer 1 includes, but is not limited to, one or any combination of polydimethylsiloxane, polymethyl acrylate, silicone rubber, AB glue, ultraviolet curing glue, and the like.
Specifically, in this embodiment, the first liquid crystal alignment layer 2 may be one of a polyimide alignment layer or a photoalignment layer SD1, or any combination of several of them.
Specifically, in the present embodiment, the cholesteric liquid crystal layer 3 may be a mixture of one or more nematic liquid crystals and one or more chiral agents, where the nematic liquid crystals may be one of E7, P0616A, MLC-2140, SLC-9023, and the chiral agents may be S811, R811, and the like, and the temperature response interval thereof is configured to cover the temperature change interval of the cable.
Specifically, in this embodiment, the second liquid crystal alignment layer 4 may be one of a polyimide alignment layer or a photo-alignment layer SD1, or any combination of several of them.
Specifically, in this embodiment, the second transparent elastomer layer 5 may be one or any combination of polydimethylsiloxane, polymethyl acrylate, silicone rubber, AB glue, ultraviolet curing glue, and the like.
Specifically, in the present embodiment, the adhesive layer 6 may be one of an AB adhesive and an ultraviolet curing adhesive.
Specifically, in this embodiment, the liquid crystal sensor device may be attached to the cable to monitor a temperature change of the cable.
Specifically, in other embodiments, the liquid crystal sensor device may also be attached to other monitoring objects, such as large processing equipment, to avoid damage to the equipment due to excessive temperature. It should be noted that the application range of the liquid crystal touch sensing device disclosed in the present application is not limited to the above, and it is also possible to monitor an appliance which is subjected to a temperature change in an operating state and adversely affected by the temperature change.
Referring to fig. 3, in the present embodiment, a method for manufacturing a liquid crystal sensor device at least includes: preparing a first transparent elastomer layer (S1); coating a first liquid crystal alignment layer on the first transparent elastomer layer (S2); preparing a cholesteric liquid crystal solution and coating the cholesteric liquid crystal solution on the liquid crystal alignment layer to form a cholesteric liquid crystal layer (S3); coating a second liquid crystal alignment layer on the cholesteric liquid crystal layer (S4); coating a second transparent elastomer layer on the second transparent elastomer layer (S5); an adhesive layer is coated on the second transparent elastomer layer (S6).
Referring to fig. 3 to 9, a method for fabricating a liquid crystal sensor device will be described in detail.
Referring to fig. 4, in the present embodiment, a substrate 101, such as a glass substrate, is prepared, a first transparent elastomer layer mixture is spin-coated on the glass substrate, wherein the first transparent elastomer layer mixture is a mixture of one of polydimethylsiloxane, polymethyl acrylate, silicone rubber, AB glue, and ultraviolet curing glue, and a solvent, such as a curing agent, and the first transparent elastomer layer mixture is allowed to stand and dried to form the first transparent elastomer layer 1.
Referring to fig. 5, in the present embodiment, as shown in the figure, a first liquid crystal alignment layer 2 is coated on the first transparent elastomer layer 1, wherein the first liquid crystal alignment layer 2 is one of a polyimide alignment layer or a photo-alignment layer SD1, and the surface of the first liquid crystal alignment layer 2 is subjected to a surface rubbing treatment to make the surface thereof smoother (please supplement the effect).
Referring to fig. 6, as shown in the figure, in the present embodiment, the step S3 specifically includes:
s31: the method comprises the following steps of ultrasonically mixing nematic liquid crystal, chiral agent-1, chiral agent-2 and spacers uniformly according to a proportion to form a cholesteric liquid crystal solution, wherein the nematic liquid crystal can be E7, P0616A, MLC-2140, SLC-9023 and the like, the chiral agent can be S811, R811 and the like, a temperature response interval of the cholesteric liquid crystal needs to cover a cable temperature change interval, and the pitch change range of the cholesteric liquid crystal can be adjusted through the content of the chiral agent-2 so as to meet the monitoring requirements of different monitored objects.
S32, coating the cholesteric liquid crystal solution on the first liquid crystal orientation layer 2;
s33: and standing and drying the cholesteric liquid crystal solution to form a cholesteric liquid crystal layer 3.
Referring to fig. 7, in the present embodiment, as shown in the figure, the step S4 specifically includes coating a second liquid crystal alignment layer 4 on the cholesteric liquid crystal layer 3, wherein the second liquid crystal alignment layer 4 may be one of a polyimide alignment layer or a photo-alignment layer SD1, and performing parallel rubbing treatment on the second liquid crystal alignment layer 4 to make the surface thereof smoother (please supplement the effect). The second liquid crystal alignment layer 4 in step S4 can be prepared simultaneously with the first liquid crystal alignment layer 2 in step S2, so as to save the number of manufacturing steps.
Referring to fig. 8, in the present embodiment, as shown in the drawing, the step S5 includes coating a second transparent elastomer layer 5 on the second liquid crystal alignment layer 4, wherein the second transparent elastomer layer 5 is one of polydimethylsiloxane, polymethyl acrylate, silicone rubber, AB glue, uv-curable glue, and the like, and more specifically, the second transparent elastomer layer 5 in the step S5 can be prepared simultaneously with the first transparent elastomer layer 1 in the step S1, so as to achieve the purpose of saving the manufacturing steps.
Referring to fig. 9, in the present embodiment, as shown in the figure, an adhesive layer 6 is coated on the second transparent elastomer layer 5, wherein the adhesive layer 6 may be any one or a combination of an AB adhesive and an ultraviolet curing adhesive.
In one embodiment, in step S1, a mixture of a prepolymer of Polydimethylsiloxane (PDMS) and a curing agent in a ratio of, for example, 5-12:1, is coated on an ITO glass and cured in an oven at a temperature ranging, for example, from 70 to 100 degrees Celsius, for a period of time ranging, for example, from 5 to 15 minutes, to form a transparent Polydimethylsiloxane (PDMS) elastomer layer.
In one embodiment, in step S2, a first alignment agent solution, such as a polyimide alignment agent solution, is spin-coated on a Polydimethylsiloxane (PDMS) elastomer layer, and then the solution is left to stand and dried, and then a flannelette is used to perform a parallel rubbing process, wherein the rubbing pressure may be 5-15N/cm2For example 10N/cm2To obtain a Polydimethylsiloxane (PDMS)/Polyimide (PI) elastomer film;
in a specific embodiment, in step S3, the nematic liquid crystal may be one of slc1717, E7, slc7011, slc099535 and slc1011, for example, cholesteric liquid crystal 90% E7 and chiral agent 10% R811 and 10 μm spacer are mixed uniformly and coated on the elastomer film prepared in step S2 to obtain a cholesteric liquid crystal layer.
In one embodiment, in steps S4 and S5, the cholesteric liquid crystal layer is covered with a layer of Polydimethylsiloxane (PDMS)/Polyimide (PI) elastomer film, i.e., a second liquid crystal alignment layer and a second transparent elastomer layer, to form a sandwich structure. It is to be emphasized that the above steps are performed in the order of the first transparent elastomer layer, the first liquid crystal alignment layer, the cholesteric liquid crystal layer, the second liquid crystal alignment layer, and the second transparent elastomer layer.
In one embodiment, in step S6, an adhesive, such as AB glue, may be applied on the first transparent elastomer layer or the second transparent elastomer layer by blade coating, and the adhesive is adhered to the object to be tested, and the temperature of the object to be tested is reflected by the color displayed by the liquid crystal device.
It should be noted that, as shown in the figure, a cholesteric liquid crystal with a specific pitch in the liquid crystal sensor device corresponds to a specific developing temperature, as shown in fig. 10, cholesteric liquid crystals with different pitches (such as pitch-1, pitch-2, and pitch-3) are used to respectively manufacture a liquid crystal sensor device-8, a liquid crystal sensor device-9, and a liquid crystal sensor device-10, which are adhered to different areas of the surface of the same object to be tested, and the temperature corresponding to the object to be tested is analyzed according to the developing tape, so as to reflect the state in time, thereby achieving the purpose of protecting the object to be tested, prolonging the service life of the product, reducing the cost of enterprises, and having a very high industrial utilization value.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (10)
1. A liquid crystal sensing device, comprising:
a first transparent elastomeric layer;
a first liquid crystal alignment layer;
a cholesteric liquid crystal layer;
a second liquid crystal alignment layer;
a second transparent elastomeric layer; and
and an adhesive layer.
2. The liquid crystal sensor device of claim 1, wherein the first transparent elastomer layer and the second transparent elastomer layer are one of polydimethylsiloxane, polymethyl acrylate, silicone rubber, AB glue, ultraviolet curing glue, and the like.
3. The liquid crystal sensor device of claim 1, wherein the first and second liquid crystal alignment layers are one of polyimide alignment layers or photoalignment layers.
4. The liquid crystal sensor device of claim 3, wherein the cholesteric liquid crystal layer is formed by mixing one or more nematic liquid crystals with one or more chiral agents.
5. The liquid crystal sensing device of claim 1, wherein the liquid crystal sensing device is configured to monitor cable temperature changes.
6. A method for manufacturing a liquid crystal sensor device, comprising:
preparing a first transparent elastomer layer;
coating a first liquid crystal alignment layer on the first transparent elastomer layer;
preparing a cholesteric liquid crystal solution and coating the cholesteric liquid crystal solution on the liquid crystal alignment layer to form a cholesteric liquid crystal layer;
coating a second liquid crystal alignment layer on the cholesteric liquid crystal layer;
coating a second transparent elastomer layer on the second transparent elastomer layer; and
and coating an adhesive layer on the second transparent elastomer layer.
7. The method of claim 6, wherein the preparing the first transparent elastomer layer comprises:
spin coating the first transparent elastomer layer mixture on a glass substrate;
and standing and drying the mixed solution of the first transparent elastomer layer to form the first transparent elastomer layer.
8. The method of claim 1, further comprising parallel rubbing the first liquid crystal alignment layer.
9. The method of claim 6, wherein preparing a cholesteric liquid crystal solution and applying the cholesteric liquid crystal solution on the liquid crystal alignment layer to form a cholesteric liquid crystal layer comprises:
uniformly mixing nematic liquid crystal, a chiral agent-1, a chiral agent-2 and a spacer in proportion by ultrasound to form a cholesteric liquid crystal solution;
coating the cholesteric liquid crystal solution on a first transparent elastomer layer;
and standing and drying the cholesteric liquid crystal solution to form a cholesteric liquid crystal layer.
10. The method of claim 6, wherein the adhesive layer is coated on the second transparent elastomer layer by knife coating.
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