55results about How to "Improve pressure sensitivity" patented technology

A touch sensor that includes a pressure detection sensor and a position detection sensor. The pressure detection sensor includes a piezoelectric film, a first piezoelectricity detecting electrode adjacent a first principal surface of the piezoelectric film, and a second piezoelectricity detecting electrode adjacent a second principal surface of the piezoelectric film. The position detection sensor includes a dielectric substrate, a plurality of first position detecting electrodes adjacent a first principal surface of the dielectric substrate, and a plurality of second position detecting electrodes adjacent a second principal surface of the dielectric substrate. In the pressure detection sensor, the second piezoelectricity detecting electrode includes an electrode non-forming section in a region where the first position detecting electrode and the second position detecting electrode overlap each other.

The invention discloses an acoustic surface wave pressure sensor and an acoustic surface wave temperature sensor which can improve pressure-measuring sensitivity or a temperature frequency response speed and comprise a top cover and a base. The top cover and the base are sealed and mounted together, and metal electrodes penetrate through the base which is provided with a pressure conduction through hole; a fluid septum is sealed and fixed on the inner surface of the base to cover the pressure conduction through hole; a closing cavity is formed among the base, the top cover and the fluid septum; both ends of a substrate are fixed on the fluid septum, and the substrate bridges the pressure conduction through hole; an acoustic surface wave pressure sensing resonator and a datum resonator which are arranged on the substrate and the substrate are mutually parallel along the length direction; an acoustic surface wave temperature sensing resonator forms a horizontal included angle with the datum resonator; the acoustic surface wave pressure sensing resonator rightly faces to the central part of the pressure conduction through hole; the acoustic surface wave temperature sensing resonator, the acoustic surface wave pressure sensing resonator and the datum resonator are respectively connected with corresponding bonding pads; the metal electrodes are correspondingly connected with the two bonding pads; and a frontal projected area of a pressure sensitive area on the substrate is smaller than a cross section area of the pressure conduction through hole.

The present invention discloses a conformal graphene-based capacitive pressure sensor and a preparation method thereof. The sensor is of a flat plate structure and comprises three main layers, namely, a graphene electrode layer, a dielectric layer and a graphene electrode layer which are sequentially distributed from top to bottom, wherein one or both of the upper graphene electrode layer and the low graphene electrode layer are conformal graphene transparent conductive films. The conformal graphene transparent conductive films are obtained by transferring conformal graphene on a metal surface with three-dimensional microstructures to the surface of a polymer elastomer through using a conformal transfer method. The conformal graphene can be both an electrode layer and a pressure sensing layer; and the three-dimensional microstructures on the surface of the conformal graphene are used to sense local deformation caused by touch pressure. With the microstructures adopted, the contacts of the capacitive pressure sensor can be increased, and the pressure sensitivity of the capacitive pressure sensor can be improved. A lot of pores exist between the three-dimensional microstructures, and therefore, the extrusion space of the elastomer can be increased, and a pressure test range can be extended. The conformal graphene-based capacitive pressure sensor has the advantages of simple structure, low cost, transparency, flexibility and easiness in processing.

The invention discloses an IVB-family element modified CaCu3Ti4O12-based pressure-sensitive material and a preparation method thereof. The general formula of a chemical composition of the pressure-sensitive material is CaCu3Ti4-xAxO12, wherein A is one or the composition of several of IVB-family elements in the periodic table of chemical elements and is not Ti, and x is equal to 0.002-2. The preparation method comprises the following steps of: proportioning calcium carbonate, copper oxide, titanium dioxide, zirconium dioxide and hafnium dioxide in a stoichiometric ratio of the CaCu3Ti4-xAxO12, wherein, x is equal to 0.002-2; A is one or the composition of several of the IVB-family elements in the periodic table of chemical elements and is not Ti; then carrying out the processes of ball milling, calcining, secondary ball milling, pelleting, shaping, rubber discharging and high-temperature sintering to finally prepare CaCu3Ti4O12-based ceramic with good pressure-sensitive characteristic. The invention effectively improves the pressure-sensitive characteristic of the ceramic, reduces the leakage current thereof, and simplifies the preparation process while holding the high dielectric performance of the pressure-sensitive ceramic, thereby making the ceramic meet commercial demands.

The sensing device is characterized in that continuous discharging welding is performed on the single-mode fiber and the capillary tube in a welding mode that the discharging power of 45bit and the discharging time is 3000ms until one part of the capillary tube is expanded to be a hollow ball cavity; a capillary tube thin layer is formed at the welding place of the single-mode fiber and the capillary tube, so multiple Fabry-Parot cavities are formed; the circulator receives light from the broadband light source and transmits the light to the sensing head; the sensing head reflects the light back to the circulator and then is transmitted to the spectrum analyzer through the circulator, so a structure which is similar to a Fabry-Parot interferometer is formed; and wavelength drift quantity of reflection spectrum characteristic valleys is measured, so a value of a to-be-measured environmental parameter can be calculated. The sensing device is advantaged by small size and simple preparation and can be applied to measurement of air pressure and temperature.

An improved cushioning apparatus having a plurality of individual pockets containing an improved filler material comprising granular viscoelastic foam.

The invention provides a full-nanofiber electronic skin which comprises an upper nanofiber membrane, a middle nanofiber membrane and a lower nanofiber membrane which are a contact electrification layer, a middle electrode layer and a bottom supporting layer respectively. The contact electrification layer and the bottom supporting layer are both nanofiber membranes made of biodegradable materials.And the middle electrode layer is a nanofiber membrane with a sterilization function and is electrically connected with the ground or other conductors. The electronic skin is provided with a pluralityof layers of staggered nanofiber networks and a large number of three-dimensional micro-nano hierarchical pores, so that the electronic skin has air permeability, high output, high pressure sensitivity and antibacterial property.

The present invention provides a display panel and a display device. The display panel comprises electrode block groups; the electrode block group comprises at least two adjacent electrode blocks; each electrode block group is electrically connected to a connection unit; the connection unit is used for, in a pressure scanning phase, electrically connecting the capacitances consisting of each electrode block in the electrode block group and floating electrode layers to be the combined capacitance, and in a touch scanning phase and the display scanning phase, making each electrode block in the electrode block group be isolated from each other. In the pressure scanning phase, it is ensured that the difference between the electric capacity feed backed by the combined capacitance and the independent capacitance in an initial state phase, and the preset electric capacity is in a preset range, so that the initial electric capacity feed backed by the combined capacitance and the independent capacitance of the entire display panel is relatively average, then the signal to noise ratio of the pressure detection can be improved, implementation of initial electric capacity compensation in the panel can be facilitated, sensitivity of pressure sensing can be improved, and a relatively high pressure sensing effect of the display panel can be ensured.

The invention belongs to the technical field of detonation pressure transient measurement, and discloses a compact detonation pressure measuring system based on Bragg fiber grating. The compact detonation pressure measuring system based on Bragg fiber grating includes a broadband light source, an optical isolator, a first optical coupler, a second optical coupler, a third optical coupler, a pressure FBG sensing grating embedded into the tested explosive, a chirped matching grating embedded into the tested explosive, an M-Z unbalanced interferometer, a photoelectric detection circuit, a analog-to-digital conversion circuit, a DSP processor and a fiber spectrometer. The compact detonation pressure measuring system based on Bragg fiber grating senses the detonation pressure by means of the frequency shift effect of the pressure FBG sensing grating on the incident light, and eliminates the optical interference signal which is generated from explosion wave through the chirped grating matching the emission bandwidth, so as to improve the signal to noise ratio. And at the same time, through the fiber spectrometer, the compact detonation pressure measuring system based on Bragg fiber grating calibrates the relation between the sensor pressure and the phase, and compensates and calibrates the initial pressure of the sensor. The compact detonation pressure measuring system based on Braggfiber grating utilizes the compact structure, and can be widely applied to the detonation pressure measurement field.

The invention provides a pressure sensing device with high sensitivity, which comprises a wideband light source, a circulator, a sensing head and a spectrum analyzer, wherein the sensing head is composed of a corrosion multimode fiber and an ultraviolet adhesive. The pressure sensing device with high sensitivity is characterized in that after the multimode fiber end surface is corroded, a conical cavity is obtained, the ultraviolet adhesive is penetrated in the conical cavity, and an air cavity coated by the ultraviolet adhesive is formed in the conical cavity. The circulator receives light from the wideband light source and transmits the light to the sensing head, the sensing head reflects the light back to the circulator, the light is then transmitted to the spectrum analyzer via the circulator, a similar Fabry-Perot interferometer is formed, and wavelength drift of a reflection spectrum characteristic peak is measured, and thus, the numerical value of a tested environmental parameter can be calculated. The pressure sensing device with high sensitivity is applicable to measurement on various environmental parameters, particularly, pressure measurement, and has the advantages of compact structure, simple manufacturing, high sensitivity, wide measurement range, and low cross sensitivity.

The invention discloses a touch control screen and electronic equipment. The touch control screen comprises a protective cover plate, a display module, a touch control sensing structure and a pressuresensing structure, wherein touch capacitance can be formed by the touch control sensing structure and an object with an applied touch operation, the touch control sensing structure comprises a firsttouch control sensing layer and a second touch control sensing layer, and the first touch control sensing layer is disposed between the protective cover plate and the display module or inside the display module; and the pressure sensing structure comprises first pressure sensing layers and second pressure sensing layers which are disposed together with the first pressure sensing layers at intervals, and the second pressure sensing layers conduct time-sharing detection of the first touch control sensing layers. In this way, the thickness of the touch control screen can be reduced, and manufacture technologies can be simplified. The touch control screen has the advantages of simple preparation technologies, high evenness of the touch control screen, high induction sensitivity, etc.

The present invention relates to a pressure regulation type children pigeon breast appliance. The pressure regulation type children pigeon breast appliance is provided with a chest orthopedic stand, a fixing strap, a pressure fixing plate, a pressure monitoring gauge, fixing tying belts, tying belt fixing buttons and fixing shoulder straps, wherein two ends of the fixing strap are connected with the fixing tying belts, two ends of the chest orthopedic stand are connected with the tying belt fixing buttons, the tying belt fixing buttons coordinate with the fixing tying belts, the fixing shoulder straps are connected between the chest orthopedic stand and the fixing strap, inner sides of both the chest orthopedic stand and the fixing strap are provided with liners, the pressure monitoring gauge is disposed at an outer side face of the chest orthopedic stand, the pressure fixing plate is disposed at the inner side face of the chest orthopedic stand, and a thin film pressure sensor is disposed on the inner surface of the pressure fixing plate. The pressure regulation type children pigeon breast appliance has the advantages that the orthopedic pressure can be displayed and is adjustable, chest wall stressed situations can be monitored, the chest wall pressure degree can be conveniently adjusted, and tissue injuries caused by excessive pressure are prevented.

The invention discloses a heat exchanging method of liquid natural gas (LNG) cold energy used for a high-temperature-level cold energy user. According to the method, in the process of LNG entering tube passes of the upper portions of heat exchangers from an LNG storage tank, heat exchanging is achieved among the LNG, first refrigerant and nitrogen added into shell passes of the upper portions of the heat exchangers, and the temperature rises; the LNG passes through an air vaporizer and enters a natural gas pipeline network after the temperature rises; on the upper portions of the heat exchangers, the temperature of the first refrigerant and the nitrogen coming out of a refrigerant storage tank decreases to -40 DEG C-0 DEG C after heat exchanging is performed among the first refrigerant, the nitrogen and the LNG, and the first refrigerant and the nitrogen come into a liquid phase from a gas phase and enter the lower portions of the heat exchangers; the pressure PB of the nitrogen is determined through the formula (6) shown in the specification; the cooled first refrigerant achieves heat exchanging with second refrigerant on the lower portions of the heat exchangers, the temperature of the first refrigerant rises, the first refrigerant comes into a gas phase from the liquid phase and returns to the upper portions of the heat exchangers, and therefore a cycle is completed. Through using the usage amount of the nitrogen for changing the partial pressure of the refrigerant, the sensitivity of system operation is improved while the freezing point of the first refrigerant is lowered, and safety and stability in the heat exchanging process are guaranteed.

The invention relates to a sea urchin-shaped oxide-based composite film bionic pressure sensor. The sensor comprises a packaging layer, flexible substrates, a sensitive film and an electrode; the flexible substrates are connected to the upper part and lower part of the sensitive film; sea urchin-shaped oxide-based composite films cover the opposite surfaces of the above flexible substrate and thelower flexible substrate; and the sea urchin-shaped oxide-based composite films are connected with external electrodes. The sea urchin-shaped oxide-conductive material composite films coat the flexible substrates, and therefore, on the one hand, a sea urchin-shaped metal oxide plays a role in supporting a conductive material, and the deformability of the conductive material under the action of pressure is improved; on the other hand, the surface of the sea urchin-shaped metal oxide is coated with the conductive material, and the defects that the sea urchin-shaped metal oxide is poor in conductivity, high in power consumption and the like are overcome. Therefore, the sea urchin-shaped metal oxide and the conductive material are compounded, so that the sensor has the advantages of high sensitivity, low power consumption, simple preparation method, low cost, easiness in mass production and the like.

The invention belongs to the technical field of corrosion prevention of ocean self-repairing coatings and particularly relates to an ocean pressure alternating sensitive supramolecular microsphere anda synthesis method of the microsphere. The ocean pressure alternating sensitive supramolecular microsphere is prepared by wrapping a supramolecular nano mesoporous silicon dioxide sphere with a corrosion inhibitor and grafting and modifying the surface with cyclodextrin. The synthesized nano supramolecular microsphere has characteristics of a nanomaterial, is used as functional filling to prepareanti-corrosive paint, does not influence basic performance of the paint, and has an important application value. The pressure sensitive supramolecular microsphere has the characteristics of good stability, pressure sensitivity characteristic, good fusion with the paint and the like. The microsphere is environment-friendly and pollution-free in a use process. The microsphere is applicable to anti-corrosive coating filling of engineering and equipment such as ocean engineering, ships, deep-ocean engineering and underwater vehicles. The microsphere has the advantages of environmental friendliness, good controllability and easiness in operation and is easy in industrial production.

The invention discloses a resonant micro-pressure sensor and a preparation method thereof. The resonant micro-pressure sensor sequentially comprises a substrate layer, a buried oxide layer, a device layer and a packaging cover plate from bottom to top, wherein the substrate layer comprises a pressure sensitive film and a first boss arranged on the pressure sensitive film, and the first boss is used for constructing a stress concentration area, improving the pressure sensitivity of the resonant micro-pressure sensor and improving the rigidity of the pressure sensitive film. The device layer comprises a first resonance unit, a second resonance unit and a silicon island region comprising a plurality of silicon island units. According to the resonant micro-pressure sensor, the stress concentration area is constructed through the design of the bosses on the pressure sensitive film; the first resonance unit and the second resonance unit are respectively arranged in areas with maximum positive stress and negative stress, so that the pressure sensitivity of the micro-pressure sensor is improved; in addition, the first boss on the pressure sensitive film also adjusts the characteristic frequency of the pressure sensitive film, so that the resonance unit avoids the modal interference of the pressure sensitive film in the working range.

The invention discloses a fiber bragg grating pressure sensor packaged by a carbon fiber tube, and belongs to the field of optical fiber sensing. The sensor comprises the carbon fiber tube, packaging bodies and an optical fiber; the optical fiber is provided with a temperature compensation grating and a pressure sensitive grating; the temperature compensation grating is packaged in a hollow steel pipe through the cylindrical packaging body; the pressure sensitive grating is connected with the carbon fiber tube through high-temperature-resistant epoxy resin glue; the two ends of the carbon fiber tube are connected with a T-shaped packaging body through the high-temperature-resistant epoxy resin glue; and the T-shaped packaging body is connected with the U-shaped packaging body through the high-temperature-resistant epoxy resin glue. The pressure sensor packaged by the carbon fiber tube is simple in preparation process and low in preparation cost, can realize distributed sensing, and has a wide application prospect in practice. When a pressure test is carried out on the pressure sensor, the pressure sensor can achieve relatively high pressure sensitivity in a pressure range of 0-80MPa or even higher, and can work in a high-temperature environment; and the pressure sensor is provided with the temperature compensation grating, so that the pressure sensor can stably work in a high-temperature and high-pressure severe environment.

The invention discloses a pressure-sensitive material and a preparation method thereof. The preparation method comprises the following steps of: adding CuO-Bi2O3-B2O3 glass powder into CaCu3Ti4O12 powder in an amount of 0.1-17 percent by mass of the CaCu3Ti4O12; and performing ball milling, pelletizing, molding, binder removal and high-temperature sintering to obtain the CaCu3Ti4O12-based pressure-sensitive material modified by CuO-Bi2O3-B2O3 glass with favorable pressure sensitive characteristic. The CuO-Bi2O3-B2O3 glass powder is introduced onto a crystal boundary, so that the microscopic appearance of the CaCu3Ti4O12-based pressure-sensitive material can be controlled, the electrical property of the crystal boundary is improved, the leakage current of the material is reduced, and the pressure sensitive characteristic of the material is enhanced. On the other hand, the sintering of CaCu3Ti4O12 can be accelerated with the low-melting-point CuO-Bi2O3-B2O3 glass, so that the CaCu3Ti4O12 can be densified at lower temperature, and energy is saved.

The invention discloses a method for a measuring sea water temperature profile based on an optical fiber Brillouin scattering principle. A Brillouin optical time domain reflection principle-based measurement system consists of a narrow line-width laser, an optical coupler, a pulse generator, an optical modulator, a circulator, an optical switch, a photoelectric detector, a Brillouin frequency shift detection unit and a sensing optical cable. The sensing optical cable used by the invention has a small size and sea water corrosion resistance, and is convenient to use. The measurement system hashigh reliability and high measuring sensitivity, can provide continuous temperature field distribution of the sea water profile, and is particularly suitable for real-time continuous measurement of the sea water temperature profile.

The invention provides a flexible sensing layer, a preparation method of a flexible sensor and the flexible sensor, and relates to the technical field of sensors, and the preparation method of the flexible sensing layer comprises the following steps: preparing a flexible sensing layer matrix with a multi-stage pore structure by using a 3D printing technology; a thermoelectric material coating is additionally arranged on the surface of the flexible sensing layer substrate; and performing plasma treatment on the surface of the thermoelectric material coating to obtain the flexible sensing layer. According to the invention, the internal contact area in a pressure state is changed through the flexible sensing layer substrate with the multi-stage secondary pore structure, the variation amplitude of resistance is influenced, and the pressure sensitivity of the flexible sensing layer is improved; the thermoelectric material coating is additionally arranged, so that the temperature resistance effect is reduced, and signal crosstalk between resistance and thermoelectric voltage signals is reduced; the surface of the thermoelectric material coating is subjected to plasma treatment, so that the carrier concentration is improved, the Seebeck coefficient is further improved, and the effect of improving the temperature sensitivity of the sensor is achieved.

The invention relates to a mechanical pressure switch, in particular to a mechanical pressure switch capable of achieving high-precision rigidity compensation and a compensation method thereof, and aims to solve the problems that when a mechanical pressure switch of an existing attitude control power device is used, the spring rigidity is large, the pressure sensitivity of the mechanical pressure switch is reduced, and high-precision adjustment of a flow system is difficult to meet. According to the technical scheme, the mechanical pressure switch capable of achieving high-precision rigidity compensation comprises a microswitch, a shell, a pressure sensing unit, a lever, a compensation unit and a reset unit, wherein the pressure sensing unit is arranged on the shell, and the lever, the compensation unit and the reset unit are arranged in the shell. The microswitch is fixed in the shell; the pressure sensing unit comprises a pressure sensing piston and a pressure rod, and the pressure sensing piston is installed on the shell; one end of the pressure rod is connected with the pressure sensing piston, and the other end of the pressure rod extends into an inner cavity of the shell and acts on the lever in the anticlockwise direction; the invention further provides a high-precision rigidity compensation method based on the mechanical pressure switch.

A keyboard equipped with multipoint press positions comprises at least a baseboard, a keycap assembly and a command trigger assembly. The keycap assembly includes a support frame to hold a plurality of keycaps. The command trigger assembly includes a command circuit board and a plurality of elastic switches. The command circuit board includes a plurality of trigger portions corresponding to the keycaps and triggered by the keycaps, and at least one primary command circuit electrically connected to each trigger portion. The elastic switches are corresponding to and depressible by the keycaps to trigger the trigger portions. Each elastic switch includes a base and a primary movement portion, a first secondary movement portion and a second secondary movement portion that are respectively corresponding to a primary trigger switch and at least two secondary trigger switches of the trigger portions. The keyboard thus formed can provide higher press sensitivity.

The invention discloses a hollow-core photonic bandgap fiber interferometer sensor and a manufacturing device and method. The interferometer sensor comprises a first coupler, a second coupler, a firstoptical fiber, and a second optical fiber, wherein the first optical fiber and the second optical fiber are hollow-core photonic bandgap fibers; a first arm of the first coupler is connected to one end of the first optical fiber and the other end of the first optical fiber is connected to the first arm of the second coupler; and a second arm of the first coupler is connected to one end of the second optical fiber, the other end of the second optical fiber is connected to the second arm of the second coupler, and one end of the second optical fiber is provided with an air microcavity. The interferometer sensor uses a hollow-core photonic bandgap fiber which conducts light through photonic bandgap effects, and the guided mode energy is almost completely confined to transmission in a core. Therefore, the interferometer sensor manufactured by the optical fiber has the advantages of low insertion loss, low nonlinearity, insensitivity to environmental refractive index and bending disturbance, and can overcome the problems of poor mechanical structure, low durability, and low sensitivity.

The invention relates to a hot-melt pressure-sensitive adhesive for a normal-temperature waterproof roll butt-joint adhesive tape, and a preparation method thereof. The hot-melt pressure-sensitive adhesive is prepared from, by weight, 50 to 60 parts of SIS thermoplastic elastomer, 20 to 30 parts of polyisobutene, 5 to 10 parts of hydrogenated monomer resin, 10 to 15 parts of a tackifying resin compound, 1 to 2 parts of an antioxidant and 0.5 to 1.5 parts of an ultraviolet absorbent. Compared with like products in the prior art, the hot-melt pressure-sensitive adhesive has the characteristics of high peel strength, favorable water resistance, favorable ultraviolet resistance and the like, and can well satisfy the requirements of waterproof rolls.

The invention discloses a flexible pressure sensor based on a polyimide substrate microstructure and a preparation method thereof. The flexible pressure sensor of the present invention comprises a lower flexible substrate, a force-sensitive structural layer and an upper flexible encapsulation layer; the lower flexible substrate is a polyimide film, and its upper surface has a raised microstructure array; the force-sensitive structural layer and the lower flexible substrate The upper surface is tightly bonded, which includes a lower electrode layer, a flexible piezoresistive material layer, and an upper electrode layer from bottom to top. The flexible piezoresistive material layer is a carbon-based nanoparticle / polymer piezoresistive material with piezoresistive properties; the upper flexible package The layer is closely attached to the upper surface of the force-sensitive structure layer to protect the sensor and waterproof. The invention prepares a flexible pressure sensor based on a polyimide substrate microstructure by adopting bottom-up micro-nano manufacturing technology, and has the advantages of high sensitivity, ultra-thin and ultra-light, simple process, easy array manufacturing and strong applicability.

The invention discloses a pressure-sensitive touch screen and a display device. The pressure-sensitive touch screen comprises a pressure-sensitive module, an arc-shaped block and a touch screen body, the surface of the touch screen body is a curved surface, and the arc-shaped block comprises a plane end and an arc surface end opposite to the plane end; the cambered surface end of the arc-shaped block is connected with the inner curved surface of the touch screen body in an attached mode through a first adhesive layer, and the plane end of the arc-shaped block is connected with the pressure sensing module in an attached mode through a second adhesive layer. According to the pressure-sensitive touch screen, due to the fact that the arc-shaped block is arranged between the pressure-sensitive module and the curved screen, and the pressure-sensitive module can be completely attached to the curved screen, so that pressure-sensitive operation of the curved screen is achieved, the touch precision is higher, and the pressure-sensitive effect is improved to a great extent.