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| Number | Title | Issue Date |
| 7966881 | Arrangement for detecting resonance frequency shifts The present invention relates to an arrangement (1) for detection of a first resonance frequency (F1), related to a mass (1b′) loaded carrier means (1b), and to compare said first resonance frequency (F1) with a sec... | 06/28/2011 |
| 7814795 | Dual mode measurement system with quartz crystal microbalance A dual mode measurement system with quartz crystal microbalance (QCM) is provided, which includes a quartz sensing component, a first measurement circuit, a second measurement circuit and a switch unit. When the first measurement circuit is selected through the swit... | 10/19/2010 |
| 7726189 | Nonlinear micromechanical resonator A micromechanical resonator having an actuator configured to provide an excitation, a second component configured to move within a plane at a second frequency in response to the excitation of the actuator, and a first component coupled with the second component such... | 06/01/2010 |
| 7380477 | Method for tissue osmometry A measurement system including a staging unit including a substrate having piezoelectric properties and a conductive electrode formed on the substrate, the conductive electrode including an area adapted to receive a sample, and an oscillator coupled to the conductiv... | 06/03/2008 |
| 7322243 | Acoustic wave etch rate sensor system An acoustic wave sensor system for monitoring the etch rate or etch ability of a selective material has an acoustic wave sensing device having a piezoelectric substrate and at least one electrode coupled to the substrate for generating a propagating acoustic wave an... | 01/29/2008 |
| 7293450 | Oil quality sensor structure for permanent applications An oil quality sensor system comprise an acoustic wave viscosity and an etch rate sensor. The etch rate sensor system includes a piezoelectric substrate and one or more sensing layers configured upon the piezoelectric substrate. A layer of gold is generally configur... | 11/13/2007 |
| 7287431 | Wireless oil filter sensor A wireless oil filter sensing system includes an oil filter and a sensing mechanism that is connectable to the oil filter. The sensing mechanism includes one or more acoustic wave sensing elements and at least one antenna that communicate with the acoustic wave sens... | 10/30/2007 |
| 7275436 | Method and apparatus for measuring film thickness and film thickness growth A device for measuring thickness and/or rate of thickness increase of a film comprises at least one piezoelectric element, and first and second electrodes in contact with the piezoelectric element. A method of measuring thickness and/or rate of thickness increase of... | 10/02/2007 |
| 7266990 | Flexural plate wave sensor and array A method for manufacturing a flexural plate wave sensor includes the steps of depositing an etch-stop layer over a substrate, depositing a membrane layer over the etch stop layer, depositing a piezoelectric layer over the membrane layer, forming a transducer on the ... | 09/11/2007 |
| 7267009 | Multiple-mode acoustic wave sensor A multiple-mode acoustic wave sensor apparatus includes an acoustic wave device comprising a piezoelectric substrate and at least one electrode on the substrate. When such sensor is used in a wireless configuration, a plurality of antennas can be configured on the s... | 09/11/2007 |
| 7243801 | System for removing plastic from recycled material A system for separating pieces of plastic bag from ground yard debris and the like, e.g., asphalt shingles. A conveyor conveys the debris material along a conveyor path and an agitator bounces the conveyor to cause the lighter plastic to reposition to the top of the... | 07/17/2007 |
| 7242515 | Structure and method for reducing thermal stresses on a torsional hinged device Method and structure for mounting a torsional hinged device, such as a mirror, having a first TCE (thermal coefficient of expansion) on a substrate having a second TCE different than said first TCE. The structure comprising a plurality of compliant support posts bet... | 07/10/2007 |
| 7219536 | System and method to determine oil quality utilizing a single multi-function surface acoustic wave sensor A method and system for detecting oil quality. The quality of engine oil can be determined utilizing an acoustic wave sensor to obtain viscosity and corrosivity data associated with the engine oil. The acoustic wave sensor is coated with a material that selectively ... | 05/22/2007 |
| 7216543 | Mass measurement system and method using measurement of frequency shift of vibrator The present invention relates to a mass measurement system and method capable of precisely measuring the mass of a sample in a gravity-free environment. The mass measurement system using measurement of frequency shift of a vibrator according to the present invention... | 05/15/2007 |
| 7204128 | Engine wear and oil quality sensor A viscosity and corrosivity sensor apparatus includes a substrate upon which one or more electrodes are configured. The electrode(s) are exposed to a liquid, such as automotive oil. An oscillator can be connected to the electrode, wherein the oscillator assists in p... | 04/17/2007 |
| 7199498 | Electrical assemblies using molecular-scale electrically conductive and mechanically flexible beams and methods for application of same Electromechanical systems utilizing suspended conducting nanometer-scale beams are provided and may be used in applications, such as, motors, generators, pumps, fans, compressors, propulsion systems, transmitters, receivers, heat engines, heat pumps, magnetic field ... | 04/03/2007 |
| 7196450 | Electromechanical assemblies using molecular-scale electrically conductive and mechanically flexible beams and methods for application of same Electromechanical systems utilizing suspended conducting nanometer-scale beams are provided and may be used in applications, such as, motors, generators, pumps, fans, compressors, propulsion systems, transmitters, receivers, heat engines, heat pumps, magnetic field ... | 03/27/2007 |
| 7171844 | Apparatus and method for measuring the mass of a substance An apparatus for measuring the mass of a substance includes a sensor having a membrane layer, the membrane for receiving the substance thereon, an oscillator device for driving the membrane at a reference resonant frequency, a frequency detection device for determin... | 02/06/2007 |
| 7165452 | Measuring method, measurement-signal output circuit, and measuring apparatus A measuring apparatus for detecting a change in frequency of a piezoelectric vibrating reed is realized with a simple circuit. The circuit of the measuring apparatus includes a phase lock loop circuit 20 which includes a phase comparator 22, a loop fil... | 01/23/2007 |
| 7161096 | Mass measurement system and method using inertial force and standard mass in gravity-free environment The mass measurement system includes a linear acceleration motion unit that is a linear motion driving source, a first load cell fastened to the linear acceleration motion unit to measure an inertial force of a sample caused by linearly accelerated motion of the 10 ... | 01/09/2007 |
| 7157897 | Method and system for electronic detection of mechanical perturbations using BIMOS readouts A sensor for detecting mechanical perturbations represented by a change in an electrical signal includes a structure such as a cantilever, membrane, etc. and a field effect transistor such as a MOSFET embedded in the structure. The drain current of the embedded tran... | 01/02/2007 |
| 7140261 | Acoustic wave flow sensor An acoustic wave flow sensor is disclosed, which includes a sensor substrate and an acoustic wave diaphragm etched upon the sensor substrate, wherein mechanical stress or strain is concentrated in the acoustic wave diaphragm. One or more interdigital transducers can... | 11/28/2006 |
| 7119550 | Capacitance difference detecting circuit and MEMS sensor Oscillators have capacitors, respectively, whose capacitances change according to an external force and generate first oscillating signals according to the capacitances. Each of the capacitors is disposed, for example, between a substrate and a mass body that is mov... | 10/10/2006 |
| 7091427 | Apparatus using resonance of a cavity to determine mass of a load A scale is provided, the scale including a cavity having a resonant frequency which is alterable with variations in mass of a load applied to the cavity. The scale also typically includes a comparator operatively coupled with the cavity to detect actual resonant fre... | 08/15/2006 |
| 7075216 | Lateral field excited acoustic wave sensor An acoustic wave sensor having a piezoelectric substrate shaped to generate lateral electric fields. The sensor has a pair of electrodes deposited upon a reference surface of the substrate. A sensing surface that is opposite from the reference surface is adapted to ... | 07/11/2006 |
| 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 provided. The frequency of the “push oscillator” is made immune to tem... | 05/30/2006 |
| 7000453 | Flexural plate wave sensor and array A flexural plate wave sensor array includes a substrate, and a plurality of flexural plate wave sensors, each sensor including a cavity formed in the substrate, a thin film membrane layer spanning the cavity, a piezoelectric layer disposed on the thin film membrane ... | 02/21/2006 |
| 6972553 | Sensor readout circuit A sensor readout circuit which provides a frequency signal output including a phase detector circuit responsive to an output signal from a sensor and an input signal to the sensor and configured to detect the phase difference between the input signal and the output ... | 12/06/2005 |
| 6964196 | Resonant pivoting surface with inertially coupled activation A system and method for providing resonant movement about a first axis. A functional surface supported by a first pair of torsional hinges is driven into resonant oscillations about the first axis by inertially coupling energy through the first pair of torsional hin... | 11/15/2005 |
| 6931949 | Apparatus for measuring the weight of small items The invention provides an apparatus for measuring the mass and calculating the weight of individual objects to be held thereby, comprising forceps having a proximal portion and a distal portion, the proximal portion being adapted to grasp and hold a selected object,... | 08/23/2005 |
| 6928877 | High throughput microbalance and methods of using same A method and apparatus for measurement of mass of small sample sizes. The method and apparatus is particularly adapted for providing microbalance measurement of solid materials as part of a combinatorial research program. The method and apparatus contemplate monitor... | 08/16/2005 |
| 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 modal shape of the resonance of the resonator and means (21... | 06/21/2005 |
| 6888073 | Vibration absorbing system of micro gravity rotating apparatus A substance mass measuring system is applied to a microgravitational rotating apparatus vibration control system to easily measure the mass of an object placed in an experimental box. Recess portions (10a, 10b) are provided in a casing ( | 05/03/2005 |
| 6848299 | Quartz crystal microbalance with feedback loop for automatic gain control An analytical apparatus, such as a quartz crystal microbalance, comprises a piezoelectric sensor and an oscillator circuit, coupled to the sensor, to oscillate at a frequency substantially determined by a resonant frequency of the sensor, and to provide an output si... | 02/01/2005 |
| 6820485 | Method and apparatus for measuring film thickness and film thickness growth A device for measuring thickness and/or rate of thickness increase of a film comprises at least one piezoelectric element, and first and second electrodes in contact with the piezoelectric element. A method of measuring thickness and/or rate of thickness increase of... | 11/23/2004 |
| 6805009 | Resonant sensor A resonant sensor for determining structural property changes, in particular for detecting the presence of chemical or biological species, comprises a structure (2) mounted to be capable of resonating and having a cyclically symmetrical configuration with two... | 10/19/2004 |
| 6784381 | Method of manufacturing a microbalance 22A temperature and/or pressure compensated microbalance is disclosed. Temperature compensation is achieved by applying heat to at least a part of the microbalance, measuring a temperature-dependent variable, and controlling the amount of heat applied to the ... | 08/31/2004 |
| 6756548 | Apparatus and method for measuring mass in a microgravity environment An apparatus and method of measuring the mass of a test specimen located in a microgravity environment. The test specimen is attached to the free end of a cantilevered spring for joint vibration. The natural frequency of vibration of the spring and specimen are meas... | 06/29/2004 |
| 6722200 | Apparatus and method for ultrasensitive nanoelectromechanical mass detection The invention relates to the application of the techniques of nanoelectromechanical systems (NEMS) to ultrasensitive mass detection. A pulsed flux of atoms is adsorbed onto the surface of a 32.8 MHz nanomechanical resonator within an ultrahigh vacuum environment. Th... | 04/20/2004 |
| 6706977 | Self-monitoring controller for quartz crystal microbalance sensors A controller for a quartz crystal microbalance (QCM) sensor system and method for detecting mass deposition on a QCM sensor. The controller controls a QCM using temperature-, voltage- and current-regulating circuits, a microcontroller, an oscillator, heating and coo... | 03/16/2004 |
