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1390 results about "Strain sensor" patented technology

Strain Sensor Basics and Signal Conditioning Tips. Strain gauges are sensing devices that change resistance at their output terminals when stretched or compressed. They are typically bonded to the surface of a solid material to measure its minute dimensional changes when put into compression or tension.

Method of making a cutting instrument having integrated sensors

A cutting instrument including a metal blade has a recess formed therein and a semiconductor substrate affixed to the blade in the recess. The semiconductor substrate includes at least one sensor formed thereon. The sensor formed on the semiconductor substrate may comprise at least one or an array of a strain sensors, pressure sensors, nerve sensors, temperature sensors, density sensors, accelerometers, and gyroscopes. The cutting instrument may also further include a handle wherein the blade is affixed to the handle and the semiconductor substrate is electrically coupled to the handle. The handle may then be coupled, either physically or by wireless transmission, to a computer that is adapted to display information to a person using the cutting instrument based on signals generated by one or more of the sensors formed on the semiconductor substrate. The computer or handle may also be adapted to store data based on the signals generated by one or more of the sensors. A method of making said cutting instrument includes the steps of at least one sensor being formed on a semiconductor wafer and a layer of photoresist being applied on a top side of the semiconductor wafer according to a pattern that matches the defined shape of the semiconductor substrate. The portion of the semiconductor wafer not covered by the photoresist is removed and thereafter the photoresist is removed from the semiconductor wafer, thereby leaving the semiconductor substrate having a defined shape and at least one sensor formed thereon. The semiconductor substrate having a defined shape and at least one sensor formed thereon is then affixed to a metal blade in a recess formed in said blade.

Telemetry method and apparatus using magnetically-driven MEMS resonant structure

A telemetry method and apparatus using pressure sensing elements remotely located from associated pick-up, and processing units for the sensing and monitoring of pressure within an environment. This includes remote pressure sensing apparatus incorporating a magnetically-driven resonator being hermetically-sealed within an encapsulating shell or diaphragm and associated new method of sensing pressure. The resonant structure of the magnetically-driven resonator is suitable for measuring quantities convertible to changes in mechanical stress or mass. The resonant structure can be integrated into pressure sensors, adsorbed mass sensors, strain sensors, and the like. The apparatus and method provide information by utilizing, or listening for, the residence frequency of the oscillating resonator. The resonant structure listening frequencies of greatest interest are those at the mechanical structure's fundamental or harmonic resonant frequency. The apparatus is operable within a wide range of environments for remote one-time, random, periodic, or continuous/on-going monitoring of a particular fluid environment. Applications include biomedical applications such as measuring intraocular pressure, blood pressure, and intracranial pressure sensing.

Gas circulation charging/discharging fatigue test system for full-automatic high pressure vessel

The invention discloses a full-automatic high-pressure container gas circular charging and discharging fatigue test system which not only can realize the full-automatic control of the high-pressure gas circular charging and discharging fatigue test but also can carry out the on-line automatic detection to the fatigue condition of the high-pressure container. The automatic control of the circular charging and discharging is realized through the dynamic response signals of a temperature sensor arranged inside the tested container, the dynamic response signals of each pressure sensor on the high-pressure pipelines and switching of solenoid valves controlled by the control strategy. The gas medium in the circular charging and discharging process can be recycled after the pressurizing by a pressure-releasing receiving tank and a gas compressor so as to avoid the gas waste and environment contamination. The dynamic fatigue states of the high-pressure container in the circular charging and discharging process are acquired through the changing of response signals of a hydrogen sensor arranged in a sealed bin of the tested container and the response signals of a strain sensor stuck to the surface of the tested container; and when the released hydrogen concentration reaches the set value or the strain of the container material exceeds the set value in the charging and discharging process, the fatigue test system is closed automatically.

Method for monitoring sleeve circumferential strain by using optical fibre grating sensor

InactiveCN101397903AGuaranteed stabilityOvercoming the limitations of susceptibility to electromagnetic interferenceSurveyUsing optical meansGratingEngineering
The invention relates to a method for monitoring the circumferential strain of a casing by applying optical-fiber grating sensors, which mainly solves the problem that an electric-resistance strain gauge adopted of the current technology for monitoring the circumferential deformation of the casing is easy to be affected by electromagnetism in a well and corrosion, thus causing a measured circumferential strain signal of the casing to be inaccurate. The method is characterized in that: the optical-fiber grating sensors are arranged outside the casing along the circumferential direction of the casing, wherein, a plurality of optical-fiber grating sensors are evenly arranged around the casing; sections of adjacent intervals form a certain angle; an optical-fiber temperature compensating sensor is arranged in a position at a corresponding distance away from the group of sensors; the optical-fiber grating sensors are applied to monitoring the circumferential deformation and stress status of the casing within certain ranges; meanwhile, the temperature compensating sensor is applied to serving the temperature compensation and temperature monitoring in the well of the strain sensor; the sensors transmit underground signals to the ground by a transmission optical cable; and the signals can be transformed into the circumferential strain information of the casing after a demodulation instrument obtains the signals and carries out secondary treatment. The method is characterized by not being affected by the underground electromagnetism.
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