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7624645 |
Compensation apparatus
The invention relates to a compensation apparatus for compensating for thermally induced relative axial positional changes between two components, having a first compensation part which brings...
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7487683 |
Endurance testing apparatus
An endurance testing apparatus, which is for performing an endurance test of a contacting/separating portion in which a first member and a second member repeats contacting with and separating from...
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7360439 |
Sample resistance measurement device
In a circuit, as the bridge resistance of one side of a Wheatstone bridge circuit, a distortion gauge (fixed reference resistance) of which variation caused by environmental conditions is...
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7331242 |
System for testing paving materials
A system for measuring the critical temperatures for thermal cracking of asphalt binders. The exemplary embodiment comprises a metal ring, at least one strain gauge attached to the inner surface of...
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7299701 |
Compressive fatigue and energy test apparatus and method for testing clutch plate friction materials
The present invention presents a means for simultaneously testing the compressive strength and measuring the thermal energy dissipated by a given friction material during slip. The testing...
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7268566 |
Active sensor circuit with one or more T-network pairs
A sensor circuit is provided that includes at least one pair of interconnected T-networks. Each pair has a first T-network including a first impedance serially connected to second impedance at a...
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7132838 |
Active sensor circuit with one or more T-network pairs
A sensor circuit is provided that includes a first T-network including a first impedance serially connected to a second impedance at a first junction and a first variable resistance sensor element...
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7104138 |
Strain detector
A strain detector includes an insulating substrate, a power electrode, output electrodes and a ground electrode which are disposed over the insulating substrate, a strain-resistance element...
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7052174 |
Device for determining changes in dimension due to temperature fluctuation
An apparatus for non-destructively testing the response of a specimen to temperature change. An embodiment temperature cycles a specimen, such as a wet mortar beam, dynamically measuring change in...
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7024940 |
Force measurement of bimetallic thermal disc
An apparatus and method for determining the actuation energy generated by a bimetallic actuator during transit between first and second states of stability. The apparatus and method further...
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6928881 |
Method and apparatus for monitoring structural fatigue and use
An electronic stress monitoring device ( 1 ) is provided that is arranged to detect and record measurements of stress experienced by a structure ( 2 ) to which the stress history unit is attached,...
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6862937 |
Load sensor, temperature compensation method for the load sensor and manufacturing method of the load sensor
A load sensor comprises a load detecting element and a temperature compensating element. The load detecting element is made of the material and acting the load thereon. The temperature compensating...
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6842965 |
Method for manufacturing a strain detector
A strain detector where water does not reach a strain-resistance element and which supplies stable output at all times is provided. In the strain detector, a first protective layer made of glass is...
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6799469 |
Method of measuring forces in the presence of an external pressure
The invention relates to a method of measuring a force F exerted on a piece in a given direction in the presence of external pressure Pe and temperature T. According to the invention: the response...
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6761073 |
Strain detector having water-protective layer
A strain detector where water does not reach a strain-resistance element and which supplies stable output at all times is provided. In the strain detector, a first protective layer made of glass is...
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6755801 |
Dialysis pressure monitoring with clot suppression
Pressure is sensed in blood flow tubing by placing an aqueous, preferably isotonic, substantially cell-free solution into branch connection tubing (branch tube) that connects in branching relation...
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6587807 |
Environmental condition sensor device and method
A device and method for measuring temperature is disclosed. The device, for example, can include a thermocouple configured to generate a voltage indicative of a junction temperature; a memory...
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6559661 |
Circuit configuration for compensating the temperature non-linearity of the characteristic curves of the piezoresistive measuring resistors connected in a bridge circuit
A circuit arrangement is described for compensating temperature non-linearity of the characteristics of piezoresistive, metallic or polycrystalline resistors (bridge resistors) connected in a...
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6557419 |
Zero TCF thin film resonator
A multi-material resonant thin film beam for a micromechanical sensor having a zero temperature coefficient of frequency (TCF) which is the resonant frequency shift with temperature change. One of...
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6546806 |
Multi-range force sensors utilizing shape memory alloys
The present invention provides a multi-range force sensor comprising a load cell made of a shape memory alloy, a strain sensing system, a temperature modulating system, and a temperature monitoring...
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6523999 |
Process for evaluating life of article subjected to thermal cycles based on comparison of strain rates measured under evaluating conditions and actual service conditions
A method to accurately evaluate a thermal cycle life of an article with a restraint rate as an evaluating parameter without providing a thermal cycle under actual service conditions to the article...
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6308577 |
Circuit and method of compensating for membrane stress in a sensor
A circuit and method for correcting a sense signal of a sensor (100) where the sense signal is reduced by a negative nonlinear error component introduced by membrane stress in a sensor structure...
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6301775 |
Alumina encapsulated strain gage, not mechanically attached to the substrate, used to temperature compensate an active high temperature gage in a half-bridge configuration
A temperature compensation element for a high-temperature strain gage and the method of fabricating the same. Preferably, the element is a "dummy" strain gage not mechanically attached to the...
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6253617 |
Process for testing the freeze-thaw resistance of solids
A solid to be tested is preconditioned by drying it to a specified moisture content and its load surface is inserted downward into a test container which takes up test liquid thereby completely...
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6070471 |
Method and apparatus determining turbine stress
A method and apparatus for determining turbine rotor stresses in real time enables increased operation efficiency and more accurate stress determinations. The system calculates rotor bore and...
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6058783 |
Sensor with improved capacitive to voltage converter integrated circuit
A capacitive transducer (10) which provides an output voltage in response to the application of a mechanical stimulus such as pressure or acceleration includes a signal conditioning integrated...
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5997780 |
Zero point adjusting method for pressure detector of an injection molding machine and an apparatus therefor
A zero point adjusting method and apparatus for a pressure detector of an injection molding machine, capable of carrying out a zero point adjustment of the pressure detector when external loads...
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5979243 |
Microfabricated multifunction strain-temperature gauge
The instant invention is for a microfabricated sensor system that can measure temperature, principle strain level, and its relative strain orientation simultaneously. It is a multifunctional, small...
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5965817 |
Temperature compensation of resonant frequency measurements for the effects of temperature variations
A method for temperature compensation of resonant frequency measurements of parts uses Temperature Functions which are mathematical relationships between measured resonant frequencies and...
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5929340 |
Environmental test apparatus with ambient-positioned card support platform
An environmental test apparatus has a thermal chamber for stress testing electronic products and a wall separating the thermal chamber from ambient air around the apparatus. In the improvement, the...
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5926778 |
Method for temperature compensation in measuring systems
A method for temperature compensation in measuring systems that are dependent on the operating temperature and whose temperature dependency is caused by temperature-sensitive components that can be...
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5909132 |
Resistance bridge and its use in conversion systems
An electrical network creates a differential voltage signal and comprises a plurality of first impedance elements of substantially equal values which are connected to form an impedance bridge. The...
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5883310 |
Micromachined hot-wire shear stress sensor
A micromachined hot-wire anemometer having fast response times and higher sensitivities than conventional hot-wire anemometers is provided by micromachining doped polysilicon wires carried on...
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5864066 |
Vibration detecting sensor with temperature compensating piezoelectric element
A vibration detecting sensor includes a vibrating plate, a vibration detecting piezo-electric element attached to the upper surface of the vibrating plate, a temperature compensating piezo-electric...
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5848381 |
Decision system for determining sensor failure of temperature sensor in automobile applications
A sensor-failure decision system for determining a sensor failure of an automobile temperature sensor, comprises a first memory section adapted to receive input information indicative of a...
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5780746 |
Minimum thickness force sensor with temperature compensation
A force sensor comprising a substrate, a conductive material providing an electrically discernible response to compressive stress disposed on the substrate, and a thermocouple disposed on the...
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5734110 |
Temperature compensated, easily installed bolt-on strain sensor
A bolt-on strain sensor includes an L-shaped sensor body having a mounting hole formed at the end of each leg of the L-shaped body and a mounting hole formed at the intersection of the legs. A...
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5604685 |
Circuit arrangement for the linearization and temperature compensation of sensor signals
A circuit arrangement for the linearization and temperature compensation of capacitive sensor signals is provided which requires few components and wherein the compensated input signal is obtained...
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5553504 |
Intrumented patch for repair of fatigue damaged or sensitive structure
An apparatus for preventing, detecting, and predicting the formation and propagation of cracks in structural members. The apparatus includes a plurality of strain sensors integrally formed with a...
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5534773 |
Method for compensating an offset voltage temperature drift in a semiconductor strain gage sensor
A method for compensating an offset voltage temperature drift in a semiconductor strain gage sensor in which a temperature-sensitive power supply is modeled as the one for providing the output...
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5460050 |
Semiconductor strain sensor with Wheatstone bridge drive voltage compensation circuit
A drive circuit for a strain sensor includes a Wheatstone bridge having semiconductor strain gauges. A temperature-dependent voltage generator generates a voltage having a predetermined ambient...
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5442963 |
Temperature-compensated vibrating beam microsensor
A microsensor for application in measurements of pressure including a temperature compensated vibratory bar comprises means for measuring the resonance frequency of the vibratory bar, means for...
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5375474 |
Compensated high temperature strain gage
A device for measuring strain in substrates at high temperatures in which the thermally induced apparent strain is nulled. Two gages are used, one active gage and one compensating gage. Both gages...
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5361637 |
Temperature compensation circuitry employing a single temperature compensation element
Temperature compensation circuitry employing a single temperature compensation element is disclosed. By use of a single temperature compensation element, the effects of temperature on both zero...
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5343755 |
Strain gage sensor with integral temperature signal
A strain gage pressure sensor having a resistive bridge circuit from which is measured both the applied pressure and the temperature of the pressure sensor. A constant voltage is provided across...
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5269311 |
Method for compensating errors in a pressure transducer
Disclosed is a method of compensating any of a plurality of different pressure transducers for their characteristic pressure sensitivity, zero pressure offset, and self-heating error. The method...
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5214962 |
Constant-resistance signal conditioner for dynamic strain measurement
A dynamic strain measurement circuit includes a constant resistance conditioner. The constant resistance conditioner compensates for changes in lead wire resistance due to temperature. The...
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5202542 |
Test specimen/jaw assembly that exhibits both self-resistive and self-inductive heating in response to an alternating electrical current flowing therethrough
Apparatus either for a specimen that is to be held in a jaw assembly of, for example, a dynamic thermal-mechanical testing system or for the jaw assembly itself wherein the specimen or jaw...
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5197334 |
Programmable compensation of bridge circuit thermal response
The present invention provides compensation for temperature in a transducer by connecting the adjustment resistors to the transducer itself to provide a correct transducer output. A number of...
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5193394 |
Transducing device for accurately transducing a physical quantity into an electric signal
For transducing a physical quantity into an output electric signal, a transducing device comprises lower and upper dielectric substrates and a physical quantity sensor mounted on a predetermined...
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