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7490519 |
System and method for sensing differential pressure
A differential pressure sensing system is provided. The sensing system includes a membrane layer having a channel extending diametrically therein, and including one or more cavities provided...
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7444245 |
Field device for determining and/or monitoring a process variable
Field device for determining and/or monitoring at least one process variable of a medium in a container. The field device includes: at least one mechanically oscillatable unit connected with the...
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7415883 |
Method for protecting resonating sensors and open protected resonating sensors
A protected resonating sensor may include at least one resonating sensor unit, each sensor unit has one or more vibratable members. The protected sensor includes at least one body of gel for...
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7398690 |
Acoustic pressure sensor
An acoustic pressure sensor includes a stack of one or more acoustically responsive elements which are contained within a housing. An external acoustic pressure to be sensed is transmitted to the...
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7398689 |
Piezo inkjet printer
An inkjet printer containing a substantially closed ink duct and a transducer used to generate a pressure wave in the duct, wherein the transducer comprises a first part and, separate from the...
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7380459 |
Absolute pressure sensor
An absolute pressure sensor is provided comprising a vibration sensing element such as a piezoelectric element disposed on a vibratable seal. The seal is disposed between two gas spring chambers...
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7377172 |
Method and system for impact detection of an imaging system
A system and method for detecting at least one force, impact, shock, or vibration event on an imaging system. The system comprises a main assembly, a support assembly coupled to the main assembly,...
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7343805 |
Surface acoustic wave pressure sensor
A surface acoustic wave pressure sensor includes: a substrate and at least one flexible membrane, suspended over a cavity defined in the thickness of the substrate, the membrane being elastically...
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7334481 |
Pressure sensor with improved vibrating microassembly and optical detection system
A pressure sensor made of a wafer with a pair of parallel silicon layers and a silicon oxide layer there between, comprises a vibrating microassembly formed as a silicon beam, which is arranged in...
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7258014 |
Device for measuring pressure
A pressure measuring device ( 2 ) includes a vibrating ferromagnetic cylinder ( 4 ) and mechanically located within a casing ( 6 ). A diaphragm ( 24 ) is directly connected to the cylinder and...
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7243547 |
MEMS SAW sensor
Devices and methods for acoustically measuring temperature and pressure are disclosed. An illustrative SAW sensor can include an electrode structure that transmits and receives surface acoustic...
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7194909 |
Pressure and vibration sensing apparatus
A pressure and vibration sensing apparatus designed to sense pressure together with vibration through one apparatus. The pressure and vibration sensing apparatus includes a case adapted to be...
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7191658 |
Pressure-detecting device and method of manufacturing the same
One end of a rod-like pressure-conveying member is disposed in a sensing unit, and the other end extends into and through an insertion hole of an engine. A combustion pressure, to which the other...
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7155980 |
Resonating transducer
A resonating pressure transducer operable to measure an applied pressure by measuring changes in a resonant frequency is disclosed. The pressure transducer comprises a plurality of diaphragms...
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7155038 |
Handwriting identification system, writing implement for identifying handwriting and method for identifying handwriting
A processing terminal 10 includes a writing implement (ball point pen) 30 . The writing implement 30 is provided with a tilt change detecting mechanism for detecting a change in a tilt with...
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7104134 |
Piezoelectric cantilever pressure sensor
A piezoelectric cantilever pressure sensor has a substrate and a piezoelectric cantilever having a base portion attached to the substrate and a beam portion suspended over a cavity. The...
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7100452 |
Surface acoustic wave multiple sense element
A wireless sensor is disclosed, which includes a substrate upon which the wireless sensor can be configured. The wireless sensor includes a plurality of surface acoustic wave (SAW) sensing elements...
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7074191 |
Method and device for non-intrusive measurement of blood pressure in a circuit of a dialysis machine
A method for the non-intrusive measurement of blood pressure in a circuit of a dialysis machine, using a device provided with a sleeve forming a portion of the blood circuit and having at least one...
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7059192 |
Pressure sensor
A pressure sensor is a micro-electro-mechanical vibrating device, with a silicon substrate ( 15; 15 ′) onto which a single-layer or multilayer vibrating assembly ( 121; 221; 321 ) is formed. It...
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7047810 |
Micro-electro-mechanical pressure sensor
A pressure sensor is disclosed for measuring fluid pressure comprising a pressure sensing structure comprising a mass target suspended on a spring mechanism, wherein the mass target and the spring...
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7032454 |
Piezoelectric cantilever pressure sensor array
A piezoelectric cantilever pressure sensor array is disclosed. The piezoelectric cantilever pressure sensor array contains a substrate, a readout circuit, and piezoelectric cantilever pressure...
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7017416 |
Disposable pressure diaphragm and wireless sensor systems and methods
A disposable and wireless sensor system and method are disclosed. In general, a pressure diaphragm can be connected to one or more reusable Surface Acoustic Wave (SAW) probe heads, which are...
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7017415 |
Apparatus for sensing pressure fluctuations in a hostile environment
A pressure sensor ( 52 ) for a harsh environment such as the combustion chamber ( 58 ) of a gas turbine engine ( 50 ). The pressure sensor includes an acoustic waveguide ( 60 ) having a sensing...
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7000477 |
Optical pressure sensor
A pressure sensor is formed on a substrate, the surface of the substrate having a p-n junction and a shell with a beam inside the shell over the p-n junction. The beam and the shell and the p-n...
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6931188 |
Side-hole cane waveguide sensor
A side-hole optical cane for measuring pressure and/or temperature is disclosed. The side-hole cane has a light guiding core containing a sensor and a cladding containing symmetrical side-holes...
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6907787 |
Surface acoustic wave pressure sensor with microstructure sensing elements
A pressure and temperature sensor system, the system comprising one or more microstructure temperature-sensing elements formed on a substrate within a hermetically sealed area thereof, wherein such...
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6865950 |
Pressure monitor incorporating saw device
A pressure monitoring device includes a rigid base ( 2 ) which has secured thereto a lid ( 5 ) to define a hermetically sealed chamber ( 6 ). The lid ( 5 ) is of flexible metal material and the...
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6810750 |
Encoded surface acoustic wave based strain sensor
A passive SAW strain sensor for remotely sensing strain within a surface has a receiving SAW correlator with a signal input interdigitated transducer and a plurality of adjacent successive spaced...
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6807863 |
Vibration pickup comprising a pressure sleeve
A vibration meter having a pressure sleeve is proposed, in which the pressure sleeve may be mounted under pressure at a bottom surface on a component causing vibrations, and the bottom surface has...
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6798306 |
High-frequency oscillation circuit and measuring device
A high-frequency oscillation circuit incorporates a crystal resonator having a natural oscillation frequency in a high-frequency area within a closed circuit including one or more logic elements....
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6752020 |
Device for measuring pressure, sound and vibration and method of analyzing flow on surfaces of structural parts
In a method and apparatus for measuring pressure, sound and vibration, particularly for the flow analysis on missiles or airplanes, a sensor device which is used to sense pressure or sound waves,...
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6743870 |
Process for early detection of reactor fouling in gas phase polymerization
A process for early detection of reactor fouling occurring during a gas phase polymerization of olefin(s) using a fluidized bed reactor having a fluidization grid fitted with detection devices.
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6715355 |
Pressure monitoring system and inflation valve using same
A pressure monitoring system has a first chamber ( 11 ) and a second chamber ( 12 ) separated by a diaphragm. The diaphragm carries respective SAW devices on the respective sides thereof, the SAW...
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6644106 |
Thermal detection of standing waves
A thermal detecting device can be used to detect standing waves in a tire. A one degree F. differential has been found to exist between the high flexing points and the low flexing points in a...
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6615664 |
Method of measuring pressure by means of a pressure gauge having a resonant element
The invention relates to a method of measuring pressure in which an evacuated capsule ( 1 ) containing a resonant element ( 5 ) is placed in the fluid whose pressure is to be measured, a vibration...
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6598481 |
Quartz pressure transducer containing microelectronics
Disclosed are improved pressure transducer apparatus and methods of sensing and measuring pressure, or pressure and temperature, in a subterranean environment. The transducer apparatus and methods...
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6584864 |
Sensor
A resonant sensor comprises a support structure comprising two support points; a laminar resonator suspended between said two support points of said support structure and comprising a plurality of...
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6571638 |
Surface-acoustic-wave pressure sensor and associated methods
A pressure and temperature sensor includes a sealed insulating package and an elastic, piezoelectric substrate deformably supported within the package. At least three surface-acoustic-wave...
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6550335 |
Device for testing internal pressure of a gas reservoir of an airbag inflator
A device for testing the inflation state of an cold gas inflator for an airbag has a gas reservoir that is filled with gas at a high pressure, in particular an inert gas. Oscillations of...
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6532822 |
Resonant torsion pendulum pressure sensor
A pressure responsive mechanically resonant sensor device is provided that comprises a torsion pendulum driven at resonance. The pressure sensor includes a rigid frame to which is affixed a torsion...
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6455985 |
Pressure and temperature transducer
A pressure- and temperature-sensitive transducer comprises a tubular housing, a resonator located within the housing and end caps closing the ends of the housing. The resonator is located in a...
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6339960 |
Non-intrusive pressure and level sensor for sealed containers
A method and apparatus for determining the internal pressure of a sealed container are disclosed. The method involves: exciting a lid of the container so as to create at least two modes of...
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6131462 |
Pressure/temperature transducer with improved thermal coupling and enhanced transient response
A transducer pressure crystal having improved thermal coupling with the environment external to a pressure housing in which the crystal is disposed. A cylindrical major portion of the side wall of...
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6105434 |
Acceleration-compensated pressure transducer
The invention is an acceleration-compensated pressure transducer having only one signal crystal array joined by two masses and connecting elements to an inner part having a flange. The installation...
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6029501 |
Vibration type gas densitometer
A vibration gas density meter provided with a cylindrical resonator, a cylinder block that incorporates the above cylindrical resonator concentrically and has one end of the cylindrical resonator...
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6016704 |
Electromechanic transducer with integrated pressure sensor
A thin, flexible foil acts as the membrane of the transducer. It is circumferentially connected to a rigid support structure which connects the foil mechanically with the transducer's driving coil....
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5996418 |
Laminated pressure sensing device
The present invention provides a pressure sensing device for sensing pressure which is adapted to provide an electrical indication of a sensed pressure. The pressure sensing device has a top...
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5969257 |
Pressure measuring membrane with resonant element vibrating orthogonal to membrane movement
An improved device for measuring pressures, comprising a silicon membrane or diaphragm which is exposed, on its two faces, to two pressures whose difference is to be measured. A resonant element is...
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5939635 |
Micromechanical pressure sensor-with improved range
The workable range is extended into lower pressure region for micromechanical pressure sensors of the kind having a vibrating mass in proximity of a stationary surface by increasing the amount of...
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5852245 |
Piezoelectric pressure sensor suitable for sensing pressure at high temperatures
A piezoelectric pressure sensor for detecting pressure in a combustion chamber of an internal combustion engine includes a backing plate secured within a housing. The sensor also includes a...
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