12 results about "Pyroelectricity" patented technology

The utility model discloses an LED landscape illuminating lamp circuit, which relates to the technical field of illuminating lamps, and comprises a power supply module for supplying power; the light control module is used for illumination degree detection and electric energy transmission control; the human body pyroelectric module is used for human body pyroelectric induction; the delay control module is used for performing delay control on the voltage output by the brightness adjusting module; the brightness adjusting module is used for adjusting the electric energy power output by the illumination driving module; the illumination driving module is used for carrying out constant-current and stable-voltage regulation and supplying power to the LED landscape illuminating lamp module; and the LED landscape lighting lamp module is used for landscape lighting. The LED landscape illuminating lamp circuit can perform landscape illumination control according to the illumination degree of ambient light, automatically adjust the landscape illumination brightness according to the human body induction result, and can reduce the electric energy loss and improve the control intelligence degree of the landscape illuminating lamp.

The utility model discloses an intelligent control circuit of a household electrical appliance circuit board, which relates to the technical field of household electrical appliance circuit boards and comprises a power supply module used for electric energy conversion processing and power supply; the human body induction module is used for performing human body pyroelectric induction and controlling the power supply control module to perform electric energy transmission work when inducting a human body; the trigger control module is used for controlling the delay control module to carry out delay work when the duration of sensing the human body exceeds the timing time; the delay control module is used for setting delay time and performing delay control on power supply work of the power supply control module; and the power supply control module is used for controlling electric energy transmission and supplying power to the household appliance circuit board connected with the household appliance circuit board module. The intelligent control circuit of the household electrical appliance circuit board can improve the self-starting intelligence of the household electrical appliance circuit board and reduce the energy loss of the household electrical appliance circuit board.

The invention belongs to the related technical field of flexible pyroelectric materials, and particularly relates to a thermoforming method for improving ferroelectric polarization and pyroelectricity and a product. The method comprises the following steps: spreading polyvinylidene fluoride-tetrafluoroethylene polymer powder with a ferroelectric phase on a substrate; and heating the powder to a molten state, applying pressure to the polyvinylidene fluoride-tetrafluoroethylene polymer in the molten state, maintaining the pressure for a period of time, cooling, and releasing the pressure to obtain the required film. The invention also discloses a product prepared by the method. According to the invention, the problem that the existing P (VDF-TFE) copolymer is difficult to realize application due to low pyroelectric property is solved.

The invention belongs to the technical field of semiconductor photoelectric device processes, and particularly relates to a graphene-lithium tantalate transistor long-wave infrared detector and a preparation method thereof. The infrared detector comprises a substrate, a lithium tantalate film, a graphene layer, a source metal electrode, a drain metal electrode and a passivation layer, wherein the lithium tantalate film is located on the substrate; the source metal electrode and the drain metal electrode are arranged on the lithium tantalate film, a graphene layer is arranged on the lithium tantalate film between the source metal electrode and the drain metal electrode, and a passivation layer is arranged on the graphene layer. Graphene is introduced to a lithium tantalate film to form a ferroelectric field effect transistor structure, a vertical heterostructure of a silicon substrate, the lithium tantalate film and a graphene channel is constructed, and the excellent conductivity of graphene and the pyroelectric characteristic of lithium tantalate are utilized; the signal reading and amplifying capability and the pyroelectric response characteristic of the detector are remarkably improved, and an infrared detection unit device with high sensitivity and quick response capability is successfully prepared.

The application discloses a Td-WTe2 / 1T'-MoTe2 heterojunction device for room-temperature photoelectric detection and a preparation method and application thereof. The heterojunction device is composed of Td-WTe2 and 1T'-MoTe2, and the two are connected through interlayer van der Waals force in an overlapping area. When light irradiates the overlapping area or a neighboring area thereof, a photo-thermal-electric response can be generated due to the difference in Seebeck coefficients of the two. The application provides a device scheme for realizing room-temperature photoelectric detection by utilizing the difference in thermoelectric properties of two specific materials without relying on a traditional semiconductor depletion region or an asymmetric light irradiation condition, and has the advantages of room-temperature operation, self-power supply, near-infrared response and fast response, and has important value in the field of photoelectric detection.

This invention relates to a single-domain nanoscale pyroelectric single-crystal thin film and its preparation method. The single-domain nanoscale pyroelectric single-crystal thin film of this invention adds a thin pyroelectric elimination layer between the insulating pyroelectric thin film layer and the insulating layer. The material of this layer is the same as that of the pyroelectric thin film layer, but the polarity of its surface normal is reversed. This achieves the effect of improving charge accumulation in the pyroelectric crystal thin film. Simultaneously, the material of this layer is the same as that of the pyroelectric thin film layer, possessing the same physical properties, and has no effect on the piezoelectricity, pyroelectricity, or electro-optic coefficient of the thin film. The pyroelectric thin film layer in the structure of this invention exhibits high polarization intensity. Compared with the prior art method of placing electrodes on both sides of a composite thin film, this method does not introduce additional electrodes or other materials heterogeneous to the thin film, resulting in a simpler process, lower cost, less stress, and avoids problems such as thin film detachment between the pyroelectric thin film layer and the electrodes.

A see-through near-eye display device guides virtual-image light in a one-dimensional waveguide composed of a multi-domain lithium niobate crystal containing a plurality of ferroelectric domains. Each ferroelectric domain is polarized along a z-axis of the lithium niobate crystal and has a polarization direction opposite the polarization direction of an adjacent ferroelectric domain. The high refractive index of lithium niobate enables displaying large-FOV virtual imagery. The multi-domain structure prevents undesirable charge buildup associated with the ferroelectric and pyroelectric properties of a single-domain lithium niobate waveguide. Multi-domain lithium niobate crystals may be produced by (a) cooling a lithium niobate crystal boule, or crystal cut therefrom, through the Curie temperature in an isothermal environment with no active poling, or (b) cooling an x- or y-axis grown lithium niobate crystal, or crystal cut therefrom, through the Curie temperature in a temperature gradient that is orthogonal to the z-axis with no active poling.

The invention discloses a liquid-like surface large particle multi-type solid-liquid control method based on a pyroelectric effect. The method comprises the following steps: step 1, pretreating a pyroelectric wafer material; step 2, performing liquid phase modification on the pyroelectric wafer; step 3, preparing a photo-thermal response material; step 4, operating platform combination; step 5, directional control of liquid drops; and step 6, performing directional control on the solid particles. The control platform designed by the invention is formed by combining three layers of materials in a blocking manner, the preparation process is simple, the solid-liquid control operation method is simple and convenient, and the production cost is relatively low. According to the control platform, a liquid-like surface and a pyroelectric material are combined, on the basis that the friction force between a solid and the surface of the platform is greatly reduced on the liquid-like surface, local charge gradient is generated on the surface by means of the response mechanism of the pyroelectric material, and direct control over the solid material is achieved under the action of dielectrophoretic force; the innovative microfluidic platform and solid control mode greatly widen the practical application of the technical field of microfluidic.

The application belongs to the technical field of semiconductor photoelectric device process, and particularly relates to a graphene-lithium tantalate transistor long-wave infrared detector and a preparation method thereof. The infrared detector comprises a substrate, a lithium tantalate film, a graphene layer, a source metal electrode, a drain metal electrode and a passivation layer; the lithium tantalate film is located on the substrate; the source metal electrode and the drain metal electrode are arranged on the lithium tantalate film; the graphene layer is arranged on the lithium tantalate film between the source metal electrode and the drain metal electrode; and the passivation layer is arranged on the graphene layer. The application introduces graphene into the lithium tantalate film to form a ferroelectric field effect transistor structure, constructs a vertical heterostructure of "silicon substrate-lithium tantalate film-graphene channel", utilizes the excellent conductivity of graphene and the pyroelectricity of lithium tantalate, significantly improves the signal reading and amplification capacity and the pyroelectricity response characteristic of the detector, and successfully prepares an infrared detection unit device with high sensitivity and rapid response capacity.

A see-through near-eye display device guides virtual-image light in a one-dimensional waveguide composed of a multi-domain lithium niobate crystal containing a plurality of ferroelectric domains. Each ferroelectric domain is polarized along a z-axis of the lithium niobate crystal and has a polarization direction opposite the polarization direction of an adjacent ferroelectric domain. The high refractive index of lithium niobate enables displaying large-FOV virtual imagery. The multi-domain structure prevents undesirable charge buildup associated with the ferroelectric and pyroelectric properties of a single-domain lithium niobate waveguide. Multi-domain lithium niobate crystals may be produced by (a) cooling a lithium niobate crystal boule, or crystal cut therefrom, through the Curie temperature in an isothermal environment with no active poling, or (b) cooling an x- or y-axis grown lithium niobate crystal, or crystal cut therefrom, through the Curie temperature in a temperature gradient that is orthogonal to the z-axis with no active poling.

The invention relates to a non-magnetic low-voltage MEMS (Micro Electro Mechanical System) sputtering ion pump based on pyroelectricity. The device comprises an electron emission layer, a first spacing layer, an electron acceleration layer, a second spacing layer and an ion adsorption layer, the thinned pyroelectric crystal in the electron emission layer can generate a pyroelectric effect after the surface temperature changes, so that potential is accumulated on the surface of the crystal and electrons are released. Different from traditional electron emission of a hot cathode and a cold cathode, the electron emission structure is stable in electron emission, low in working temperature, low in working voltage and low in requirement for the vacuum degree of a working environment. Therefore, the MEMS pyroelectric sputtering ion pump based on the pyroelectric principle provided by the invention has the advantages of low working temperature, low working voltage, no need of a magnetic field and the like, and a relatively reliable vacuum pump is provided for obtaining a vacuum environment of an MEMS type vacuum device.

This invention provides Na 0.5 Bi 0.5 The application of TiO3 materials in the catalytic degradation of organic pollutants; this invention discovers that Na… 0.5 Bi 0.5 TiO3 materials possess pyroelectric properties and exhibit spontaneous polarization dependent on temperature oscillations. This allows them to generate polarized charge carriers, thereby catalyzing the degradation of organic pollutants through pyroelectricity. The thermal energy generated by temperature fluctuations is efficiently converted into chemical energy, enabling the degradation of pollutants under conditions of temperature variation in darkness, natural nighttime temperature differences, and natural daytime temperature differences under illumination.