32 results about "Pyroelectric crystal" patented technology

Non-aqueous carrier fluids containing nano-sized particles in high concentration are effective for zone isolation and flow control in water shutoff applications for subterranean formations. The nanoparticles interact with water and solidify it to inhibit its flow, but do not have the same effect on hydrocarbons and thus selectively assist the production of hydrocarbons while suppressing water. Suitable nanoparticles include alkaline earth metal oxides, alkaline earth metal hydroxides, alkali metal oxides, alkali metal hydroxides, transition metal oxides, transition metal hydroxides, post-transition metal oxides, post-transition metal hydroxides, piezoelectric crystals, and / or pyroelectric crystals.

The invention relates to a high-temperature-phase tellurium barium molybdate crystal as well as a preparation method and the applications thereof. The high-temperature-phase tellurium barium molybdate crystal belongs to an orthorhombic system, a space group is Pca21, a=14.8683 (2), b=5.66360 (10), c=17.6849 (3), ultraviolet-visible-near-infrared light is displayed through a light spectrum, intermediate infrared light is displayed through the light spectrum, the crystal permeates the wavelength range of 380-5530 nm, and infrared laser of 1064 nm is incident into the crystal at a room temperature to generate green light with the wavelength of 532 nm. A fluxing agent method is adopted for growth. The invention also provides the applications of the high-temperature-phase tellurium barium molybdate crystal as a nonlinear optical crystal, a birefringent crystal, a piezoelectric crystal, a ferroelectric crystal, a pyroelectric crystal or a laser substrate material.

A non-radioactive source for Atmospheric Pressure Ionization is described. The electron-beam sealed tube uses a pyroelectric crystal(s). One end of the crystal is grounded while the other end has a metallic cap with sharp feature to generate an electron beam of a given energy. The rate of heating and / or cooling of the crystal is used to control the current generated from a tube. A heating and / or cooling element such as a Peltier element is useful for controlling the rate of cooling of the crystal. A thin window that is transparent to electrons but impervious to gases is needed in order to prolong the life of the tube and allow the extraction of the electrons. If needed, multiple crystals with independent heaters can be used to provide continuous operation of the device. The energy of the electrons can be determined through the appropriate choice of the radius of curvature of the sharp feature and the gap between the sharp feature and the window, while the opposite side of the crystal is at low voltage. The size of the gap and the radius of curvature of the sharp feature are determined by the filling gas nature and pressure.

The invention relates to a tellurium-caesium molybdate crystal, growth of tellurium-caesium molybdate crystal by a flux method and application. The tellurium-caesium molybdate crystal belongs to a hexagonal crystal system, the space group is P63, and the crystal has penetrability within the wavelength range of 430-5380nm; the piezoelectric coefficient at room temperature is as follows: d33=20.5pC / N; and infrared laser with the wavelength of 1064nm generated by a Nd:YAG laser irradiates the crystal to generate strong green light. In the invention, crystal growth is realized by the flux method to finally obtain the large-sized monocrystal; and the obtained crystal is used for manufacturing a piezoelectric device and can be also taken as a nonlinear optical crystal, a ferroelectric crystal, a pyroelectric crystal and a laser host crystal.

Non-aqueous carrier fluids containing nano-sized particles in high concentration are effective for zone isolation and flow control in water shutoff applications for subterranean formations. The nanoparticles interact with water and solidify it to inhibit its flow, but do not have the same effect on hydrocarbons and thus selectively assist the production of hydrocarbons while suppressing water. Suitable nanoparticles include alkaline earth metal oxides, alkaline earth metal hydroxides, alkali metal oxides, alkali metal hydroxides, transition metal oxides, transition metal hydroxides, post-transition metal oxides, post-transition metal hydroxides, piezoelectric crystals, and / or pyroelectric crystals.

The invention relates to a pyroelectric composite material and a preparation method and application and a repeated regeneration method thereof. The pyroelectric composite material is prepared by blending pyroelectric crystal particles and a polymer electret material, wherein the pyroelectric crystal particles is a filling material and the polymer electret material is a matrix. The pyroelectric composite material has good pyroelectric effect of a pyroelectric crystal material and excellent wear resistance and mechanical property of a polymer matrix material, and can be applied in the field of air purification, such as adsorption of fine particles in atmospheric smog by electrostatic effect. In addition, the pyroelectric composite material can be rapidly and conveniently regenerated and can be made into various forms of fiber, mesh, fabric, etc. According to the invention, cost is saved, the material is repeatedly utilized, and service life of the material is prolonged. The material of the invention has a good application prospect.

An apparatus for producing x-rays for use in imaging applications having a piezoelectric or pyroelectric crystal with an upper surface and a conducting film coating the upper surface. The crystal includes a plurality of field emitters formed as micrometer-scale exposed regions in the crystal having a one or more sharp peaks or ridges, or parallel trenches forming a wedge shaped emitter. The crystal is alternately heated and cooled over a period of time so that spontaneous charge polarization occurs in the crystal. The spontaneous charge polarization causes a perpendicular electric field to arise on the crystal's top and bottom faces, that is enhanced by the sharp peaks or ridges, thereby causing field emission of surface electrons from that location. X-rays are produced when the emitted electrons strike a target material located adjacent to the emitting face, and the X-rays may be filtered or collimated.

A non-radioactive source for Atmospheric Pressure Ionization is described. The electron-beam sealed tube uses a pyroelectric crystal(s). One end of the crystal is grounded while the other end has a metallic cap with sharp feature to generate an electron beam of a given energy. The rate of heating and / or cooling of the crystal is used to control the current generated from a tube. A heating and / or cooling element such as a Peltier element is useful for controlling the rate of cooling of the crystal. A thin window that is transparent to electrons but impervious to gases is needed in order to prolong the life of the tube and allow the extraction of the electrons. If needed, multiple crystals with independent heaters can be used to provide continuous operation of the device. Dielectric shielding of the pyroelectric crystal is used to minimize discharge of the crystal.

A non-radioactive source for Atmospheric Pressure Ionization is described. The electron-beam sealed tube uses a pyroelectric crystal(s). One end of the crystal is grounded while the other end has a metallic cap with sharp feature to generate an electron beam of a given energy. The rate of heating and / or cooling of the crystal is used to control the current generated from a tube. A heating and / or cooling element such as a Peltier element is useful for controlling the rate of cooling of the crystal. A thin window that is transparent to electrons but impervious to gases is needed in order to prolong the life of the tube and allow the extraction of the electrons. If needed, multiple crystals with independent heaters can be used to provide continuous operation of the device. The energy of the electrons can be determined through the appropriate choice of the radius of curvature of the sharp feature and the gap between the sharp feature and the window, while the opposite side of the crystal is at low voltage. The size of the gap and the radius of curvature of the sharp feature are determined by the filling gas nature and pressure.

Gently heating a pyroelectric crystal in a deuterated atmosphere can generate fusion under desktop conditions. The electrostatic field of the crystal is used to generate and accelerate a deuteron beam (>100 keV and >4 nA), which, upon striking a deuterated target, produces a neutron flux over 400 times the background level. The presence of neutrons within the target is confirmed by pulse shape analysis and proton recoil spectroscopy. Several elements of the system may be modified, including the configuration of the crystal or crystals, the composition of the surrounding environment and the target, the use of multiple probe tips, and the composition of the probe tip.

The invention discloses a device and a method for measuring electrostrictive coefficients through linear frequency modulation multi-beam laser heterodyne and relates to the field of ultra-precise measurement. The device and the method for measuring the electrostrictive coefficients through the linear frequency modulation multi-beam laser heterodyne aim at solving the problem that the existing electrostrictive coefficient measuring method is low in measuring accuracy. An adjusting frame is used for fixing piezo-electric crystal with voltage to be measured; a second planar reflecting mirror is used for being fixed on one end surface of the piezo-electric crystal with the voltage to be measured; a thin glass plate and the second planar reflecting mirror are arranged in a parallel mode; laser sent out from a linear frequency modulation laser enters into the surface of the thin glass plate, the laser enters into the second planar reflecting mirror after being transmitted through the thin glass plate, and the laser is focused on the photosensitive surface of a photoelectric detector after being reflected through the thin glass plate. According to the device and the method for measuring the electrostrictive coefficients through the linear frequency modulation multi-beam laser heterodyne, the length variation amount of the piezo-electric crystal with the voltage to be measured is modulated within the frequency difference of intermediate frequency heterodyne signals, the length variation amount of a plurality of piezo-electric crystal with the voltage to be measured are obtained simultaneously due to measurement of the frequency difference, and the measuring error is 0.04 %. The device and the method for measuring the electrostrictive coefficients through the linear frequency modulation multi-beam laser heterodyne is applicable to ultra-precise measuring and detecting, device machining, laser radar system and the like.

The invention discloses a mechanism design of a nanojet device based on pyroelectric effect, a mechanism design of a micro-nano-composite-jet device based on pyroelectric effect and a control method of the micro-nano-composite-jet device. The nanojet device comprises a jet mechanism, a pyroelectric crystal, a pressure source, a heat source and a control mechanism. The nanojet device generates an electric field under the action of the heat source through the pyroelectric crystal, a solution is pulled out to form nano-scale liquid drops, and problems caused by high voltage and complicated circuit required when an electric field is directly applied to a traditional nanojet device can be avoided. A piezoelectric mechanism of a traditional jet device is further arranged on the micro-nano-composite-jet device. When micron-scale liquid drops need to be manufactured, the heat source is cut off so that micron-scale jet can be conducted, and then micro-nano-composite-transition is achieved.

The invention discloses an electric field driving type micro-drop jetting spray head based on the pyroelectric effect. The jetting spray head comprises a storage cylinder, a nozzle, a pyroelectric crystal ring, a heating ring and a shell, the nozzle is arranged below the storage cylinder, the nozzle is conical, a space within the storage cylinder and the nozzle is insulated from the outside, the pyroelectric crystal ring is of an annular structure, is installed on the shell and located right below the nozzle, the outer ring surface of the pyroelectric crystal ring and a jetting liquid in the storage cylinder are equipotential, the heating ring is located on the periphery of the pyroelectric crystal ring, and is used for heating the pyroelectric crystal ring, and the shell is fixed on the outer side of the storage cylinder in a sleeving mode. According to the electric field driving type micro-drop jetting spray head, on one hand, a lot of problems caused by high voltage and complex circuits required by direct applying of an external electric field can be avoided, and on the other hand, the problem of influence of the size of a gap between the pyroelectric crystal and a jetting device on the stability of the jet printing process can be solved.

Shear test apparatus for gold and solder balls of a semiconductor substrate comprises a support element (21) on which is provided a piezo-electric crystal (24) in the direct shear load path. The crystal (24) may have a shield (25). The interface between shield and crystal, and crystal and support element may include an epoxy resin layer to distribute force and retain the components as a unit.

Sensors, systems including sensors, and methods of using such sensors and systems are provided. In one aspect, a sensor includes a sensor element at least partially positioned within the housing. The sensor element includes a plurality of interconnected segments with each segment comprising a pyroelectric crystal and wherein the sensor may generate a single, unitary signal upon exposure of any segment to infrared radiation.

The invention relates to a method for preparing a pyroelectric sensitive element, comprising the steps of: (1) annealing the thinned pyroelectric crystal after cleaning; The upper and lower electrodes are plated on both sides of the pyroelectric crystal; (3) The vacuum evaporation process is used to coat the absorption layer on the upper electrode of the pyroelectric crystal by installing a graphic chemical device under the coating fixture. Bake for a preset time before the start and after the end; (4) After cooling down, take the piece through the air to get the specially designed patterned unit of the pyroelectric sensor of the present invention, which can improve the absorption efficiency; the upper and lower electrodes and The patterned absorbing layer all adopts the process method of vacuum thermal evaporation coating, the process control is simple, and it is suitable for the production process.

The invention relates to a high-temperature-phase tellurium barium molybdate crystal as well as a preparation method and the applications thereof. The high-temperature-phase tellurium barium molybdate crystal belongs to an orthorhombic system, a space group is Pca21, a=14.8683 (2), b=5.66360 (10), c=17.6849 (3), ultraviolet-visible-near-infrared light is displayed through a light spectrum, intermediate infrared light is displayed through the light spectrum, the crystal permeates the wavelength range of 380-5530 nm, and infrared laser of 1064 nm is incident into the crystal at a room temperature to generate green light with the wavelength of 532 nm. A fluxing agent method is adopted for growth. The invention also provides the applications of the high-temperature-phase tellurium barium molybdate crystal as a nonlinear optical crystal, a birefringent crystal, a piezoelectric crystal, a ferroelectric crystal, a pyroelectric crystal or a laser substrate material.

The invention relates to the field of biosensing technology, concretely relates to a biological sensing system based on 45-degree dual drive symmetrical structure photoelastic modulation, and the system realizes original position, rapid, high precision, high sensitivity, high repeatability, low cost, and control convenience during measurement process. The system comprises the following components:detection laser, a polarizer, a biochemical reaction tank, a microflow syringe pump, an adjustable slit, a photoelastic modulator, a polarization analyzer, a photoelectric detector, an FPGA control module, and a control computer; the biochemical reaction tank is packaged by semicylindrical mirrors and silicon wafers at interval with PDMS; a flowing channel and an outputting channel are also constructed, two channels are connected to the microflow syringe pump, the photoelastic modulator is a photoelastic modulator with a 45-degree dual drive symmetrical structure, the structure comprises a dual drive piezo electric crystal and a photoelastic crystal which form a 45 degree angle, and the piezo electric crystal is connected to an FPGA control module by an LC resonance high voltage control circuit. The product is mainly applied to the aspect of biosensing.