71results about How to "Increased pressure sensitivity" patented technology

The invention provides a flexible piezoresistive touch sensor array and a preparation method thereof. The sensor array comprises N*N separated piezoresistive layers and a coplanar electrode layer. The piezoresistive layers are arranged on the coplanar electrode layer. Each piezoresistive layer comprises an upper finger pressing layer, a middle sensitive layer and a bottom sensitive layer, wherein the three layers are each provided with a micro pyramid; the coplanar electrode layer comprises a polymer electrode substrate and N*N gold electrode pairs located on the polymer electrode substrate. The piezoresistive layers adopt polymer films with the micro pyramid, and due to the three-layer structure, the sensitivity of the sensor at the low-voltage region can be greatly improved. In addition, in order to overcome the defect that a traditional touch sensor is large in crosstalk due to a sandwiched structure, the coplanar electrode layer is adopted, all electrodes are located on the same plane, each piezoresistive layer is attached to the corresponding electrode pair, the piezoresistive units are completely separated, and the sensitivity and anti-interference capacity of the sensor are effectively improved.

A capacitive pressure sensor and method for its fabrication. The sensor is fabricated from first and second wafers to have a mechanical capacitor comprising a fixed electrode and a moving electrode defined by a conductive plate. The sensor further has a diaphragm on a surface of the first wafer that is mechanically coupled but electrically insulated from the conductive plate. A conductive layer on the surface of the first wafer is spaced apart from the conductive plate to define the fixed electrode. The second wafer is bonded to the first wafer and carries interface circuitry for the sensor, including the conductive plate and the fixed electrode which are between the first and second wafers and electrically connected to the interface circuitry. At least an opening is present in the first wafer and its first conductive layer by which the diaphragm is released and exposed to an environment surrounding the sensor.

A method for providing a pressure reference level for pressure triggering a ventilator responsive to a spontaneous breathing attempt by a patient. In the method, the patient connection of the breathing circuit is capped or plugged. A gas flow is then provided through the breathing circuit and is altered to an amount that causes the flow resistance properties of the breathing circuit to generate a desired gas pressure in the breathing circuit suitable for use as a reference pressure by the ventilator for pressure responsive triggering. During the operation of the ventilator, gas flow in a corresponding amount serves as a bias flow in the breathing circuit to assist breathing by the patient. The bias flow also generates the reference pressure level in the breathing circuit. A reduction in pressure from the pressure level resulting from inhalation by the patient triggers the operation of the ventilator.

An entirely surface micromachined free hanging strain-gauge pressure sensor is disclosed. The sensing element consists of a 80 μm long H-shaped double ended supported force transducing beam (16). The beam is located beneath and at one end attached to a square polysilicon diaphragm (14) and at the other end to the cavity edge. The sensor according to the invention enables a combination of high pressure sensitivity and miniature chip size as well as good environmental isolation. The pressure sensitivity for the sensor with a H-shaped force transducing beam, 0.4 μm thick was found to be 5 μV / V / mmHg.

The invention discloses a bionic flexible pressure sensor based on a lotus leaf micro-spinous-process / MXene composite structure. The sensor comprises a pressure-sensing layer being polydimethylsiloxane (PDMS) with a micro-spinous-process structure on the surface of a lotus leaf, a pressure treatment layer being a multilayer Ti2C-MXene film, and a signal output layer being a flexible electrode andbeing used for supporting and protecting the Ti2C-MXene film and outputting an electrical signal converted by the pressure signal. According to the bionic flexible pressure sensor based on a lotus leaf micro-spinous-process / MXene composite structure, the sensor has excellent characteristics of high sensitivity, wide linearity, low response time, high stability and the like without the complicatedstructure design and manufacturing process.

A pressure sensor includes a metal stem having a diaphragm, and a semiconductor substrate in which an insulation layer is inserted between first and second semiconductor layers. A plurality of strain gauges are formed on a predetermined area of the first semiconductor layer of the semiconductor substrate, for converting a bending of the diaphragm to an electrical signal. In the pressure sensor, the strain gauges have pattern shapes insulated and separated from each other by trenches extending from a surface of the first semiconductor layer to the insulation layer. Furthermore, the second semiconductor layer has a recess portion, which is recessed from a surface of the second semiconductor layer to the insulation layer and is provided at a position corresponding to the predetermined area. The diaphragm is inserted into the recess portion, and the insulation layer is attached to a surface of the diaphragm in the recess portion.

The invention discloses an adjustable high-flexibility low-pressure and stable-pressure pressure reducing valve, which comprises a valve body and a valve core component, wherein the valve body is provided with an inlet and an outlet; the valve core component is arranged in the valve body; a medium passage for communicating the inlet with the outlet is formed in the valve body; a throttling port is formed in the medium passage; the valve core component corresponds to the throttling port and is used for changing the medium pressure in front of and behind the throttling port; the valve core component comprises a valve core rack, a valve rod and a valve flap; the valve core rack is fixedly arranged in the valve body; the valve rod is arranged in the valve core rack; the valve flap is arranged at the lower end of the valve rod to change the flow rate of the medium passage; a sealing device is arranged between the valve rod and the valve core rack to isolate the upper part of the valve core rack from the lower part of the valve core rack; a pressure chamber in front of the valve is formed between the lower part of the valve core rack and the sealing device; the upper end of the valve core rack has a thin film structure, and a pressure chamber after the valve is formed between the upper end of the valve core rack and the upper part of the valve core rack; and a pressure adjusting structure is also arranged above the thin film structure. The valve has a simple and rational structure, is convenient to manufacture and mount, has high flexibility in pressure adjustment and has certain pressure stability, and the pressure adjustment range is adjustable.

A pressure sensor includes: a housing; a pressure input orifice opened at a pipe sleeve of the housing; a diaphragm sealing the pressure input orifice, the diaphragm having a first surface serving as a pressure receiving surface; a pressure sensitive unit using a direction of detecting a force as a detecting axis. A first end of the pressure sensitive unit is connected to a central area of a second surface of the diaphragm. A second end of the pressure sensitive unit is connected to the housing. The detecting axis is approximately orthogonal to the pressure receiving surface. A circumference of a portion where the central area and the first end of the pressure sensitive unit are in contact with each other is located inside a circumference of the central area. A thickness of the central area is larger than a thickness of an area surrounding the central area.

Since, as a rule, there are several such PSTs on an aircraft, this results in a marked reduction in weight and aerodynamic drag, and savings in the required electric power in conjunction with a simultaneous increase in the accuracy of measurement of the angle of attack. All this permits a substantial increase in the competitiveness of the proposed fuselage Pitot-static tube.

A relief valve comprising a diaphragm for control of process pressure is provided. The diaphragm has a fluid pressure on a first side and a process pressure on a second side. The second side is engagable with a process void and at least one vent void such that when the process pressure is below the fluid pressure the diaphragm is engaged with the vent void. When the process pressure is above the fluid pressure the diaphragm is not engaged with the vent void.

A pressure sensor includes: a housing; a pressure input orifice opened at a pipe sleeve of the housing; a diaphragm sealing the pressure input orifice, the diaphragm having a first surface serving as a pressure receiving surface; a pressure sensitive unit using a direction of detecting a force as a detecting axis. A first end of the pressure sensitive unit is connected to a central area of a second surface of the diaphragm. A second end of the pressure sensitive unit is connected to the housing. The detecting axis is approximately orthogonal to the pressure receiving surface. A circumference of a portion where the central area and the first end of the pressure sensitive unit are in contact with each other is located inside a circumference of the central area. A thickness of the central area is larger than a thickness of an area surrounding the central area.

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 provides an on-cell touch display screen and a portable electronic product so as to solve the problems that when the scheme of integrating a pressure inducting function piece on a backlight module of an existing In-cell touch display screen, the technology processing difficulty is large, the yield is smaller than 70%, and processing cost is high. The on-cell touch display screen comprises a protecting panel, a touch display module and a pressure inducting function piece. The pressure inducting function piece is attached between the protecting panel and the touch display module through an OCA adhesive layer. The pressure inducting function piece comprises a base layer and a pressure inducting electrode formed on the base layer. According to the on-cell touch display screen and the portable electronic product, the manufacturing process is simpler, the yield is higher and can reach 90% or above, and cost is lower.

A pressure sensor includes: a container; a pressure receiving member which forms apart of the container; a pressure sensitive element which has a pressure sensing portion and a pair of base portions connected to both ends of the pressure sensing portion, and which has a detection axis parallel to a line connecting the base portions, and in which the detection axis is parallel to a displacement direction of the pressure receiving member, and which detects pressure based on displacement of the pressure receiving member; and a gate-shaped frame which includes a pair of shock absorbing portions that interposes the pressure sensitive element and is connected to a side of the pressure receiving member close to the peripheral portion or a side of the container close to the pressure receiving member and a beam portion that connects distal ends of the shock absorbing portions.

An absolute capacitive micro pressure sensor including a pressure sensor element with a mechanically fixed electrode and a deflectable pressure sensor membrane separated from the fixed electrode by a predetermined distance. A packaging defining a chamber is formed by a cover assembled to a base plate with an opening defined therein. The chamber is filed with a fluid and / or a gas at substantially constant pressure. Within, the chamber, the pressure sensor element is mounted to the base plate to define an open cavity therebetween substantially aligned with the opening defined in the base plate. A gel is disposed in the open cavity in contact with an exposed surface of the deflectable membrane.

A relief valve comprising a diaphragm for control of process pressure is provided. The diaphragm has a fluid pressure on a first side and a process pressure on a second side. The second side is engagable with a process void and at least one vent void such that when the process pressure is below the fluid pressure the diaphragm is engaged with the vent void. When the process pressure is above the fluid pressure the diaphragm is not engaged with the vent void.

A pressure sensor includes: a container; a pressure receiving member which forms apart of the container; a pressure sensitive element which has a pressure sensing portion and a pair of base portions connected to both ends of the pressure sensing portion, and which has a detection axis parallel to a line connecting the base portions, and in which the detection axis is parallel to a displacement direction of the pressure receiving member, and which detects pressure based on displacement of the pressure receiving member; and a gate-shaped frame which includes a pair of shock absorbing portions that interposes the pressure sensitive element and is connected to a side of the pressure receiving member close to the peripheral portion or a side of the container close to the pressure receiving member and a beam portion that connects distal ends of the shock absorbing portions.

Soft capacitive pressure sensors for continuous wearable health monitoring applications are described herein. Wrinkled gold thin films on elastomeric substrates are used as robust parallel plate electrodes to create a robust integration with the polymer, allowing repeated normal force to deform the thin film without failure. By incorporating micro-ridged structures that support the counter electrodes to create air cavities within the elastomeric dielectric layer, pressure sensitivity is further increased. The pressure sensors are configured to measure human physiological signals such as pressure exerted from a radial pulse on a skin's surface. The radial pulse pressure detected by the sensor can be correlated to an arterial blood pressure. Calibration of said pressure sensors using a neural network allows for determination of absolute blood pressure.

The invention provides a landfill type electrode structure suitable for a surface acoustic wave device. The landfill type electrode structure comprises a substrate, a groove and an electrode, whereinthe groove is formed in the surface of the substrate, and the electrode is arranged in the groove. The landfill type electrode structure provided by the invention can improve the degradation phenomenon of the metal film electrode at a high temperature, so that the stable working time of the electrode under a high temperature condition is prolonged; according to the landfill type electrode structure, the reflection coefficient and the electromechanical coupling coefficient of the surface acoustic wave device can be improved, the size of the surface acoustic wave device is reduced, and the bandwidth of the device is increased; for a surface acoustic wave device applied to pressure sensing, the landfill type electrode structure provided by the invention can increase the frequency pressure coefficient and improve the pressure sensitivity.

The invention discloses an oil tank level transmitting device comprising a sensing part and a signal transmitting part which are electrically connected in a sleeve tube, wherein the sleeve tube is a sealing sleeve tube formed by an upper cover (1) and a base (8); the end part of the base (8) is provided with a window (9) on which the sensing part is arranged; the sensing part is a capacitance type pressure sensing part (6) formed by a capacity voltage converter (61), and a tabulate capacitance upper polar plate (62) and a tabulate capacitance lower polar plate (63); the output end of the capacity voltage converter (61) is electrically connected with the signal transmitting part through a sealing adapter plate (4); the sealing adapter plate (4) is positioned between the capacitance type pressure sensing part (6) and the signal transmitting part, and is provided with electric welding points penetrating through the plate body of the sealing adapter plate (4) and a waterproof molecule plug; and the signal transmitting part is a cable (2) axially and hermetically sheathed with a conducting wire and an air duct. The invention can be used for accurately measuring the oil level in the non-pressure oil tank and can be widely applied to oilfield production.

The invention relates to an annular variable capacitor and an application thereof, and belongs to the technical field of electromagnetic touch induction. The annular variable capacitor comprises a pen shell and a large-capacity pen refill assembled in the pen shell, and is characterized in that the tail end of the pen refill is closely contacted with an axial variable capacitor capable of expanding and contracting in the axial direction, and the axial variable capacitor is used for detecting axial pressure of the pen refill; an annular variable capacitor which is tightly nested between the outer side of the front half part of the pen refill and the inner side of the pen shell is used for detecting radial pressure of the pen refill; two electrodes of the annular variable capacitor are an inner electrode nested at the outer side of the pen refill and an outer electrode abutted inside the pen shell, a deformable elastic medium is arranged between the two electrodes, and the center of the inner electrode deviates when the pen refill moves along the radial direction; and the axial variable capacitor and the annular variable capacitor are arranged in parallel. According to the invention, both radial sensitivity detection and axial sensitivity detection are satisfied through a method of additionally arranging the annular variable capacitor at the outer side of the pen refill, so that replacement of a light small-capacity pen refill for a large-capacity pen refill is enabled to be possible in the field of electromagnetic touch induction.

The invention belongs to pressure measurement techniques and particularly relates to single-component quick-response pressure-sensitive paint and a formulating method. The single-component quick-response pressure-sensitive paint comprises a pressure-sensitive probe, a macromolecular adhesive, filler and an organic solvent in a specific proportion. The macromolecular adhesive and the pressure-sensitive probe are added and dissolved into the organic solvent, and then the filler in a specific quantity is added to obtain the paint. The obtained paint is 0.7% / kPa in pressure sensitivity, applicable to high-speed and low-speed wind tunnel dynamic pressure measurement tests not higher than 1KHz in measurement frequency and also applicable to conventional steady-state pressure measurement tests, a gap of domestic quick-response pressure-sensitive paint can be filled, and simple proportion, convenience, quickness, low cost and high practical application value are realized.

The invention discloses an intelligent cement-based composite material with high pressure-sensitive sensitivity. The intelligent cement-based composite material with high pressure-sensitive sensitivity comprises cement, silica fume, electrostatic self-assembly carbon nanotubes / titanium oxides, water reducing agents, sand and water. Compared with the prior art, the intelligent cement-based composite material with high pressure-sensitive sensitivity effectively solves the problem of dispersion of nano-scale fillers in cement-based materials, and the carbon nanotubes and micron-level titanium oxide assemblies are low in water absorptivity, so that the intelligent cement-based composite material with high pressure-sensitive sensitivity and small dosage of the electrostatic self-assembly carbonnanotubes / titanium oxides has stable and high pressure sensitivity on the basis of keeping a mechanical property.

A relief valve comprising a diaphragm for control of process pressure is provided. The diaphragm has a fluid pressure on a first side and a process pressure on a second side. The second side is engagable with a process void and at least one vent void such that when the process pressure is below the fluid pressure the diaphragm is engaged with the vent void. When the process pressure is above the fluid pressure the diaphragm is not engaged with the vent void.

The invention discloses a pressure sensor. The pressure sensor comprises a film assembly used for converting pressure to be detected into self-deformation, a magnetic membrane body directly formed on the film assembly and used for providing a magnetic field, a pressure inlet used for conducting the pressure to be detected to the film assembly and a magnetic field sensor used for detecting the magnetic field changes and converting signals of the magnetic field changes into electric signals. In the working process, the pressure to be detected is input from the pressure inlet and conducted to the film assembly, the film assembly converts the pressure to be detected into self-deformation, and the magnetic membrane directly arranged on the film assembly generates magnetic flux intensity changes along with deformation of the film assembly. The magnetic field sensor detects the magnetic flux change signals and converts the signals into the electric signals to be output. The pressure sensor is simple in structure, a semiconductor packaging process is not needed, the process cost is low, the yield is high, and the pressure sensor is suitable for large-scale industrial production.

A keyboard includes a base plate, a pressure sensing layer, plural key structures, a circuit board, a flexible layer and a controlling unit. The pressure sensing layer is disposed on the base plate and located under the circuit board. The flexible layer is disposed on the pressure sensing layer and located under the circuit board. While a key structure is depressed, a part of the key structure is penetrated through the circuit board to press the flexible layer, and a force is transmitted from the flexible layer to the pressure sensing layer. The controlling unit compares the force with a predetermined force value. According to the comparing result, the controlling unit generates a corresponding pressure sensing signal. Consequently, the use of a single key structure can achieve the functions of multiple keys.

A method of processing has been described for a light-sensitive black-and-white silver halide photographic material comprising the distinct steps of developing, fixing, rinsing and drying, wherein during said processing said developer comprises, besides one or more developing agent(s), one or more agent(s) preventing oxidation thereof and agent(s) providing pH buffering in running equilibrium conditions during said processing, at least one agent preventing silver dissolution and at least one silver complexing agent, characterized in thatsaid agent preventing silver dissolution, if present in an amount of 50 mg / l of developer, makes silver content of the developer decrease in an amount of more than 50% versus in the absence thereof, without loss in speed in an amount of more than 0.10 log Exposure after processing in said developer composition;said silver complexing agent makes silver content of the said developer increase in an amount of more than 1 mg per liter per mmole of said complexing agent.