2104results about "Fluid pressure measurement using ohmic-resistance variation" patented technology

A reference voltage generating circuit is constituted by resistors RE and RF each having a resistance not influenced by an application of pressure. The reference voltage generating circuit is connected between one and the other ends of a bridge circuit. A failure judgement of the bridge circuit is performed based on a comparison of a voltage difference VBC between two midpoints B and C of the bridge circuit and voltage differences VCE and VBE between a reference voltage level of the reference voltage generating circuit and the voltage levels of two midpoints B and C.

A method of constructing a sensor includes depositing a first material in a predetermined arrangement to form a structure. The depositing results in at least one void occurring within the structure. The method further includes depositing a second material within the voids. The second material may have electrical properties that vary according to deformation of the second material. The method also includes providing electrical access to the second material to enable observation of the one or more electrical properties. A sensor includes a structure that has one or more voids distributed within the structure. The sensor also includes a material deposited within the one or more voids. The material may be characterized by one or more electrical properties such as piezoresistivity. The sensor includes a first contact electrically coupled to a first location on the material, and a second contact electrically coupled to a second location on the material.

The invention relates to a device for measuring pressure, temperature and/or flow velocity. It includes a sensor (6) with a sensor support body (13) provided with a diaphragm (15) covering a cavity (14) formed in the support body (13). A pressure sensitive element (41) is mounted on the diaphragm, for recording pressure. Furthermore, a temperature sensitive resistor (42) is mounted in the vicinity of the pressure sensitive resistor and has a known temperature dependence, for recording temperature. It also includes an electrical circuit (43, 44, 45, 46) selectively outputting signals from either of the pressure sensitive element and the temperature sensitive resistor.

A pressure sensor for sensing a pressure of a fluid includes a monolithic metal including substrate having a substantially planar top side, wherein the metallic comprising substrate includes s a relatively thick boss near a center of the substrate and a thinned sensing portion that is elastically deformable and pressure-sensitive positioned radially outward from the boss. At least one dielectric layer is on the top side of the substrate. A plurality of piezoresistors are on the dielectric layer, wherein the piezoresistors are positioned over the thinned diaphragm portion. At least one overglaze layer is over the conductor layer that provides apertures for electrically contacting the plurality of piezoresistors. A sensing system includes a housing including at least a first port for coupling to a fluid for measurement of a pressure of the fluid and at least one sensor in the housing including a pressure sensor according to an embodiment of the invention.

A mechanical deformation amount sensor includes a sensor structure which is formed by a semiconductor substrate or an insulating substrate and integrally includes a deformation portion deformable, when a physical quantity to be detected is applied to the sensor structure, due to the physical quantity and a support portion for supporting the deformation portion, a carbon nanotube resistance element which is provided on the deformation portion so as to be mechanically deformed in response to deformation of the deformation portion and a wiring pattern which is formed in a pattern on the sensor structure so as to be connected to the carbon nanotube resistance element. By applying a voltage to the carbon nanotube resistance element via the wiring pattern, a change of electrical conductivity of the carbon nanotube resistance element upon mechanical deformation of the carbon nanotube resistance element is fetched as an electrical signal.

A fluid pressure sensor for a lead or catheter intended for placement in a living organism, such as a human heart, includes a rigid annular or tubular supporting structure and a piezoelectric element disposed on at least a portion of the outer surface thereof. The piezoelectric element delivers an electrical signal when subjected to a pressure variation, and exhibits circumferential sensitivity. The rigidity of the sensor is defined to satisfy predetermined criteria to ensure that the sensor, when sensing pressure transferred to the sensor through an on-growth of tissue on the sensor, which is at least 90% of the signal which the sensor would emit without the on-growth.

A method and apparatus are described for fabricating an exposed backside pressure sensor (30) which protects interior electrical components (37) formed on a topside surface of a pressure sensor transducer die (31) from corrosive particles using a protective gel layer (38) and molding compound (39), but which vents a piezoresistive transducer sensor diaphragm (33) formed on a backside of the pressure sensor transducer die (31) through a vent hole (42) formed in an exposed die flag (36), enabling the sensor diaphragm (33) to directly sense pressure variations without the influence of a protective gel.

A pressure sensor assembly comprised of a single and dual layer diaphragm with integrated force sensing flexure, such as a cantilever beam. Strain gages are positioned on the force sensing beam. The pressure forces the diaphragm to deflect. The deflection is constrained by the beam, which is compelled to bend. The bending induces strains in strain gages located on the beam. The strain gages are connected in a Wheatstone bridge configuration. When a voltage is applied to the bridge, the strain gages provide an electrical output signal proportional to the pressure. Composite diaphragm—beam pressure sensors convert pressure more efficiently and improve sensor performance.

A non-invasive dry coupled disposable/reusable ultrasonic sensor has a housing and a piezoelectric element at one end of the housing to which connected signal leads are connected that extend out from the housing. A piece of double-sided adhesive tape has one adhesive side secured directly to the face at the one end of the housing with the other adhesive side to be secured directly to the outer surface of a pipe or vessel. The tape can cover the entire face of the one end of the housing or only that part that the piezoelectric element faces.

The invention relates to an integrated silicon chip for testing acceleration, pressure and temperature, and the manufacturing method thereof. The invention is characterized in manufacturing the pressure sensor, temperature sensor and accelerometers of thermoelectric pile on to one chip by the same micro processing technology. The acceleration is detected by adopting thermal convection type accelerometers, using polysilicon resistor as heater, using a thermoelectric pile composed of two pairs of metals (such as aluminium and tungsten-titanium) and P type or N type polysilicon to detect the temperature difference in the sealed cavity caused by acceleration. The high accurate absolute pressure sensor is manufactured by using silicon nitride film with low stress as the core structure layer of the pressure sensor chip, and forming force sensitive resistor track by polysilicon film, forming vacuum reference cavity by TEOS bolt in LPCVD furnace. At the same time, the temperature sensor is composed by using polysilicon thermistor to detect temperature change. The integrated chip achieves the advantages of microminiaturization, low cost, high precision, high reliability and high stability.

A pressure sensor and a pressure sensing method are provided. The pressure sensor includes a substrate; a sensor thin film transistor (TFT) disposed on the substrate and including a gate insulating layer, wherein the gate insulating layer includes an organic matrix in which piezoelectric inorganic nano-particles are dispersed; a power unit configured to apply an alternating current (AC) signal to a gate of the sensor TFT; and a pressure sensing unit configured to obtain a remnant polarization value based on a drain current which is generated in response to the AC signal and detected by the sensor TFT, and to sense a pressure based on the remnant polarization value.

Implantable pressure sensors and methods for making and using the same are provided. A feature of embodiments of the subject pressure sensors is that they are low-drift sensors. The subject sensors find use in a variety of applications.

An absolute pressure sensor is disclosed that includes a plurality of pressure sense die and a hermetically sealed cover located above the plurality of pressure sense die. A carrier can be provided to which the pressure sense die are mounted by a cured adhesive. The carrier and the pressure sense die can be attached to a circuit board populated with a plurality of surface mounted components for electrical connection to the absolute pressure sensor. An ASIC can also be provided for digitally calibrating the pressure sense die with temperature compensation, wherein the ASIC automatically controls a plurality of output modes thereof during calibration.

The invention provides a scale measuring device for a pitching dynamic derivative experiment. An electric motor is arranged in a motor support rod; a motor output shaft is connected with a transmission shaft via a speed reducer and a shaft coupling; the transmission shaft is rotationally connected with a scale support rod; the rear end of the scale support rod is fixedly connected with the front end of the motor support rod; the front end of the transmission shaft is provided with an eccentric wheel which is provided with a lug; the lug is inserted into a sliding chute of a slide block; upper and lower cross springs of a cross spring scale have a crisscross structure respectively, and the front and rear ends thereof are fixedly connected with a scale frame via a front seat; and central positions of the upper and lower cross springs are provided with supporting cylinders. The scale measuring device for the pitching dynamic derivative experiment is a novel pitching dynamic derivative scale device. A pitching direct derivative of an aerial craft and a rolling crossover derivative induced by yaw oscillation can be measured under a big attack angle by designing a special vibrating mechanism, the cross spring scale and a pitching five-component scale structure. The scale measuring device for the pitching dynamic derivative experiment can meet the requirement of a wind tunnel trial.

The invention discloses a pressure sensor based on Si-Si direct bonding, comprising a silicon substrate (1) with a shallow groove (8); the silicon substrate (1) is provided with a single crystal silicon stress membrane (2); a silicon dioxide layer (3) is arranged between the silicon substrate (1) and the stress membrane (2); four P-type single crystal silicon piezoresistors (4) are arranged on the stress membrane (2); an insulating medium silicon dioxide layer (7) is arranged among the stress membrane (2) and the piezoresistors (4); and a Wheatstone bridge is formed among the piezoresistors (4) by utilizing concentrated boron doped silicon (9) and a golden lead (6). The pressure sensor adopts Si-Si direct bonding technology to form the stress membrane and the sealing cavity; the piezoresistors thereof adopt silicon dioxide as an insulating layer and the working temperature can be up to 300 DEG C; and the pressure sensor has firm structure and excellent performance and can meet the requirements on high-temperature pressure sensors in the fields of automobile, aerospace and the like. The invention also relates to a manufacturing method of the pressure sensor.

A microelectromechanical device and method of fabricating the same, including a layer of patterned and deposited metal or mechanical-quality, doped polysilicon inserted between the appropriate device element layers, which provides a conductive layer to prevent the microelectromechanical device's output from drifting. The conductive layer may encapsulate of the device's sensing or active elements, or may selectively cover only certain of the device's elements. Further, coupling the metal or mechanical-quality, doped polysilicon to the same voltage source as the device's substrate contact may place the conductive layer at the voltage of the substrate, which may function as a Faraday shield, attracting undesired, migrating ions from interfering with the output of the device.

The invention relates to a sensor and guide wire assembly (21; 31; 41) for intravascular measurements of physiological variables in a living body, comprising a core wire (22; 32; 42) and sensor element (23; 33; 43). The sensor element (23; 33; 43) according to the invention comprises basically a mounting base (24; 34; 44) and a pressure sensitive end portion (25; 35; 45) whose upper side is provided with a pressure sensitive device, such as a membrane (26; 36; 46). The mounting base (24; 34; 44) extends downwards from the end opposite to the pressure sensitive end (25; 35; 45), such that, when the sensor element (23; 33; 43) is mounted on the core wire (22; 32; 42), a clearance (27; 37; 47) is formed below the pressure sensitive end (25; 35; 45).