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7380454 |
Load beam for surface acoustic wave accelerometer
Methods and systems for forming accelerometers include forming a load beam supported at one end having an input interdigital transducer (IDT) and an output IDT. The load-beam has a cross section...
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7243544 |
Passive and wireless acoustic wave accelerometer
An acoustic wave acceleration sensor comprises an acoustic wave device including a plate that functions as a propagation medium and at least one interdigital transducer configured upon the plate....
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6553836 |
Surface acoustic wave (SAW) accelerometer
A monolithic low cost, high frequency surface acoustic wave (SAW) accelerometer is provided that is operable in high impact and vibration applications.
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6237417 |
Apparatus for measuring impedance of a resonant structure
Apparatus for measuring the value of a physical quantity which affects the impedance of an electrically resonant structure, the apparatus comprising an electrically resonant structure, an RF...
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5684456 |
Tilt-sensor
A tilt-sensor for detection of a tilt angle is proposed, in particular for use as a roll-over sensor in a car for activation of an occupant protection device, comprising a massive body and an...
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4920801 |
Accelerometer
An accelerometer capable of sensing acceleration in three orthogonal directions while being formed in a single silicon wafer comprises three cantilever beams (2) etched from the wafer, each having...
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4803883 |
Accelerometer
An accelerometer comprising a frame having an input axis (y) and a cross axis (x) orthogonal to and co-planar with the input axis. The accelerometer has a flexible beam coupled to a proofmass. The...
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4676104 |
Surface skimming bulk acoustic wave accelerometer
An accelerometer includes a cantilevered pieozelectric beam mounted to a surface inside a fluid filled chassis with a proof mass attached to the beam's free end. Surface skimming bulk wave delay...
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4621530 |
Surface acoustic wave accelerometer
A differential surface acoustic wave (SAW) accelerometer comprises a resilient beam 1 one end of which is clamped in a support 2. Opposite faces of the beam are provided with SAW transducers 3, 4...
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4573357 |
Elastic surface wave force sensor
The invention provides a sensor comprising a plate resting on two supports by simply bearing thereon, for creating in said plate uniform bending stresses in a defined zone of said plate. Detector...
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4566329 |
Vectorial force sensor with elastic surface waves
The vectorial force sensor with elastic surface waves according to the invention comprises a mechanical part, for example a lamella, subjected to a stress (σ). One face of the lamella incorporates...
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4515016 |
Elastic surface wave accelerometers
An elastic surface wave accelerometer having a deformable structure, fixed at one end and providing at its free end a seismic mass. The deformable structure may be an open frame with a single post...
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4467235 |
Surface acoustic wave interferometer
Disclosed is a surface acoustic wave interferometer, including a substrate on which are disposed a first reflector and a second reflector so as to define a multimode resonant cavity therebetween. A...
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4346597 |
Dual range, cantilevered mass accelerometer
A dual range accelerometer includes a mass 10 supported on a cantilevered beam 12, there being stops 70, 71 such that for low accelerations the beam acts as a cantilever and for high accelerations,...
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4333342 |
Fluid damped saw accelerometer
An accelerometer comprising a mass 10 supported on a piezoelectric cantilevered beam 12 with SAW resonators 17, 46 disposed on the surface of the beam includes cover plates 66, 68 over the SAW...
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4306456 |
Elastic wave accelerometer
The invention discloses an elastic wave accelerometer for measuring acceleration at least in one direction. The device comprises a solid support, a seismic mass and a piezoelectric wafer embedded...
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4301683 |
Elastic surface wave accelerometer
The invention relates to an accelerometer comprising at least one elastic plate propagating elastic surface waves, to which a normal force is applied resulting from the action of the acceleration...
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4199990 |
Elastic surface wave accelerometer
The invention relates to accelerometers comprising a vibrating elastic body associated with an electrical oscillator for maintaining its oscillations and a frequency measuring device for measuring...
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3940636 |
Acoustic delay surface wave motion transducer systems with enhanced stability
Transducer devices employing relative changes in the acoustical propagation characteristics of surface waves traveling on opposite surfaces of a thin elastic cantilever beam yield a measure of the...
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3863497 |
ACOUSTIC DELAY SURFACE WAVE MOTION TRANSDUCERS
Transducer device employing relative changes in the acoustic propagation characteristics of waves of the Rayleigh type flowing at a polished surface of a thin elastic member yield a measure of the...
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3848144 |
ACOUSTIC DELAY SURFACE WAVE MOTION TRANSDUCER SYSTEMS
Transducer devices employing relative changes in the acoustic propagation characteristics of waves of the Rayleigh type flowing along polished surfaces of a thin elastic member yield a measure of...
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