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7293605 |
Feed-back control system for heat exchanger with natural shedding frequency
The invention relates with the feed-back control system of a heat exchanger by use of the flow resonance phenomenon which maximizes the heat transfer efficiency by generating the flow disturbances...
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7053319 |
Electronic weighing apparatus utilizing surface acoustic waves using sensors operating at different frequencies, having temperature compensation, and a push oscillator
A weighing apparatus includes a SAW oscillator and a “push oscillator” to force the SAW oscillator into a desired mode of operation. A SAW temperature oscillator and a thermistor are also...
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7036378 |
High and low frequency band dual output transducer
A sensor circuit, method, and system for conversion of a high-impedance, broad frequency range signal from a transducer into two low-impedance signals, one containing high-frequency components and...
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7035718 |
Method and System for detecting and reducing draft tube pressure fluctuations
A method and system to reduce vibration in a turbine-generator including measuring a magnitude of radial vibration of a turbine shaft with at least one vibration sensor configured to generate a...
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7024934 |
Vibrating beam accelerometer
Microelectromechanical system (MEMS) integrated micro devices and acceleration sensor devices formed of first and second silicon wafers that are permanently joined together in a composite silicon...
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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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6907785 |
Diagnostic sensor
A sensor of force or viscosity or other attributes of a fluid comprises a mechanical resonator ( 10 ) including an element ( 11; 18; 123 ) of which the stiffness at least partially determines a...
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6628124 |
Electrocapacitive force measuring apparatus
A sensor unit is formed by a single integral body obtained by coupling a resiliently deforming portion with a base portion without interposing a soft material therebetween, and a force applied to a...
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6611782 |
Real time boxing sports meter and associated methods
A power sensing unit is incorporated into a boxing glove for use according to a method of quantifying impact forces in a boxing match in real time. Impact force data is transmitted from the boxing...
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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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6463813 |
Displacement based pressure sensor measuring unsteady pressure in a pipe
A non-intrusive pressure sensor and method for measuring pressures within a pipe includes a displacement based sensor disposed on a surface of the pipe. The displacement based sensor measures the...
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6438243 |
Vibration wave detector
A vibration wave detector having a first diaphragm for receiving vibration waves, such as sound waves and so on, to be propagated in a medium, a resonant unit having a plurality of cantilever...
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6286374 |
Preload measuring apparatus of rolling bearing
A preload measuring apparatus to measure the preload of a rolling bearing that includes a bearing support, a pressurization device, an excitation device, a vibration sensor, and a control section....
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6272917 |
Draw-false twisting management system
A draw-false twisting management system that measures untwisting tension with an untwisting tension sensor (13) and diagnoses trouble in a draw-false twisting machine, wherein the measured values...
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6269698 |
Vibrating beam force sensor
A mechanical resonator having interconnected vibrating beams and counter balances whereby transfer of energy from the vibrating beams is essentially eliminated.
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6259081 |
Device for receiving a transmission signal and for transmitting an optical beam and method of using the device
A device is provided for receiving a transmission signal and for transmitting an optical beam having an adjustable intensity, wherein the optical beam effects the transmission signal. A transmitter...
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6178821 |
Vibration sensing device
A vibration sensing device including a strip bearing a pattern of markings. The strip is caused to slide back and forth in front of a sensor as the result of vibration or displacement of an object...
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6173612 |
Stable metallization for electronic and electromechanical devices
Described are various improved methods of forming electronic devices, electro-mechanical devices, force-sensing devices, and accelerometers. Also described are various improved electronic devices,...
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6131452 |
Process and device for detecting structural faults of moving flat textile materials
The device for on-line detection of structural faults in moving flat textile materials includes a spade-like leaf spring contact sensor (2) having a length of from 5 to 20 cm which is...
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6012341 |
Force sensor having an adjustable distance between an operating point and a point of mechanical instability
A force sensor, especially an acceleration sensor or a pressure sensor, has a structure that vibrates in resonance, and its oscillation frequency is variable due to an acting force which is to be...
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5962786 |
Monolithic accelerometric transducer
A monolithic accelerometric transducer comprises a fixed part, two mobile mass parts and a resonator having ends fastened to said mobile parts, a flexible frame around the two mobile parts, and two...
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5869763 |
Method for measuring mass change using a quartz crystal microbalance
A quartz crystal resonator is excited in two different modes at the same time such that the mass change and the temperature change can be measured independently. In using such a quartz crystal the...
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5834646 |
Force sensor device
A force sensor device for sensing seismic force due to changes in acceleration or pressure, comprising mass-spring system formed by a resonant flexible plate forming system mass and suspended from...
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5808210 |
Thin film resonant microbeam absolute pressure sensor
A micromechnical sensor having a polysilicon beam that is an integral part of the diaphragm resulting in a frequency of the beam that is a direct result of the pressure applied to the external...
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5747705 |
Method for making a thin film resonant microbeam absolute
A micromechnical sensor having a polysilicon beam that is an integral part of the diaphragm resulting in a frequency of the beam that is a direct result of the pressure applied to the external...
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5729075 |
Tuneable microelectromechanical system resonator
A resonant beam or cantilever is implemented in single crystal silicon or polysilicon. Adjacent the end of the cantilever is an electrode capable of receiving a variable voltage. The cantilever has...
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5668329 |
Spurious mode map for DETF force transducer
A double-ended tuning fork (DETF) is formed from two vibrating beams joined together at each end, having a thickness t, a width w, a length L and a vibrating beam length m. The dimensional ratios...
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5629489 |
Load cell assembly with linearization and common mode discrimination of complementary force-responsive signals
A load cell assembly includes a load cell body having a pair of sensors mounted therein which provide complementary output signals in response to a force applied to the load cell body. A...
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5619046 |
Method of manufacturing a measuring device
The invention concerns a method of manufacturing a measuring device of the Fabry-P erot resonator type. The invention likewise concerns a measuring device manufactured by means of the method. The...
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5597965 |
Method and apparatus for measuring the preload gap of a double row rolling bearing
An method and apparatus for measuring the preload gap of a double row rolling bearing, such that it is possible to accurately determine the preload to be obtained when the inner ring is fully...
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5574220 |
Vibrating beam force-frequency transducer
A vibrating beam force-frequency transducer has a flat elongate blade designed to be interposed between two elements for applying a longitudinal force to the blade. The middle portion of the blade...
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5559358 |
Opto-electro-mechanical device or filter, process for making, and sensors made therefrom
The present invention relates to microstructures fabricated from semiconductor material and having a flexible member which is excited into various modes of resonance and in which such resonance is...
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5553506 |
Force sensor and a method for manufacturing a force sensor
In a force sensor, a resonator is mounted by means of a dielectric layer on a bending element. Deformation of the bending element changes the resonant frequency of the resonator.
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5550516 |
Integrated resonant microbeam sensor and transistor oscillator
At least one microbeam situated on a substrate, having a resonant frequency dependent on the strain on the microbeam which may be affected by the bending of the substrate. The beam or beams have...
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5546810 |
Pressure measuring device and method using quartz resonators
The temperature dependence of the difference in oscillation frequency between two quartz resonators caused by the pressure difference between the two quartz resonators as well as the intrinsic...
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5517858 |
Method and instrument for measuring for measuring preload of rolling bearing
While maintaining a shaft in a fixed state, an outer ring is rotated. Vibrations of the shaft are detected by a first vibration pickup and a second vibration pickup. Detection signals of both the...
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5501103 |
Two-port electromagnetic drive for a double-ended tuning fork
An electromagnetically-excited silicon micromachined vibrating beam accelerometer includes a proof mass or pendulum attached to an outer casing by way of a pair of flexures defining a hinge axis...
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5481072 |
Low profile load cell for a weighting machine
A load cell, one end of the cell being mounted on a base and the other end of the cell being arranged for connection to a force applicator so that in operation applied loads are transmitted...
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5478975 |
Vibrating beam force sensor clamping assembly
In a load cell for a weighing machine, the load cell includes a vibrating beam force sensor clamped at its two ends to respective support parts of the load cell, and wherein each end of the sensor...
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5450762 |
Reactionless single beam vibrating force sensor
A reactionless single beam vibrating force transducer utilizes counterbalances at opposite ends of the beam that rotate in directions opposite to the ends of the vibrating beam to reduce rotational...
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5447075 |
Self-exciting optical strain gage
A self-exciting optical strain sensor (20) includes dual parallel bridges (22,24) having parallel facing surfaces (32,34). Light energy (38) entering a Fabry-Perot cavity (36) formed by this...
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5442146 |
Counting scale and load cell assembly therefor
The invention is directed to a counting scale which implements a load cell assembly for the measurement of weight used in counting calculations. A load cell in such an assembly has a beam structure...
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5435195 |
Planar single-piece measuring string with two nodes for the measurement of linear displacements or forces
A planar single-piece measuring string which is designed to oscillate transversely to the plane defining its rest position has two attachment tabs, a resonating string section, two coupling...
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5435191 |
Natural frequency measurement apparatus and tension measurement apparatus using the same
The vibration of a belt or the like detected by a microphone is shaped into rectangular waveforms. The period of each cycle of waveform is held by a latch (8) and sequentially stored in a period...
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5426981 |
Vibrating sensor
A vibrating sensor comprises an elongated element arranged to vibrate at a frequency dependent upon an external stress applied to the sensor, and an optical fiber for coupling light into an end of...
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5423218 |
Method and instrument for measuring contact angle of rolling bearing
While maintaining an outer ring in a fixed state, an inner ring is rotated. Radial vibrations of the outer ring are detected by a vibration pickup, and detection signals are delivered to a...
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5417120 |
Vibrating beam force transducer with automatic drive control
A vibrating beam force transducer is comprised of an oscillating sensing element having an output frequency indicative of the force applied to the sensing element. The sensing element has a...
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5408888 |
Load measuring apparatus
An apparatus for measuring a force or load comprising a vibratory beam which vibrates back and forth at a resonant frequency. The beam has first and second end nodal points and first and second...
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5391844 |
Load cell
The invention is a load cell for the measurement of force, independent of displacement, created by means such as weight, acceleration, pressure, and the like. The load cell has a beam structure...
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5379653 |
Force measuring device
A force measuring device has a cell possessing an axis and a ring. The ring is coaxial with the axis and is elastically deformable by shearing as a result of forces which are parallel to the axis...
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