90 results about "Capacitance meter" patented technology

The invention relates to a flexible, resilient capacitive sensor suitable for large-scale manufacturing. The sensor comprises a dielectric, an electrically conductive layer on the first side of the dielectric layer, an electrically conductive layer on a second side of the dielectric layer, and a capacitance meter electrically connected to the two conductive layers to detect changes in capacitance upon application of a force to the detector. The conductive layers are configured to determine the position of the applied force. The sensor may be shielded to reduce the effects of outside interference.

A sensor is attached to a backing plate of a brake pad. The sensor comprises a metal arm extending to one side of the brake pad. The metal arm is electrically insulated from the backing plate. A tab made from a dielectric material projects from a free end of the arm in the same direction that the brake pad extends from the backing plate. The tab is bonded to the arm by an electrically conductive paste. The tab has a wear face spaced from the backing plate the same distance as a brake surface of the brake pad. When a brake is applied by a vehicle operator, both the brake pad brake surface and the tab wear face frictionally engage a brake rotor fixed to a wheel hub. The dielectric material is selected so the tab wears at the same rate as the brake pad. A lead wire connected to the arm enables the capacitance of the tab to be measured by a grounded capacitance meter when the brake is applied. The capacitance changes as the dielectric material wears away. The capacitance is used to indicate the remaining amount of brake pad life on a digital readout.

The invention relates to a flexible, resilient capacitive sensor suitable for large-scale manufacturing. The sensor comprises a dielectric, an electrically conductive detector and trace layer on the first side of the dielectric layer comprising a detector and trace, an electrically conductive reference layer on a second side of the dielectric layer, and a capacitance meter electrically connected to the trace and to the conductive reference layer to detect changes in capacitance upon interaction with detector. The sensor is shielded to reduce the effects of outside interference.

The invention relates to a flexible, resilient capacitive sensor suitable for large-scale manufacturing. The sensor comprises a dielectric, an electrically conductive detector and trace layer on the first side of the dielectric layer comprising a detector and trace, an electrically conductive reference layer on a second side of the dielectric layer, and a capacitance meter electrically connected to the trace and to the conductive reference layer to detect changes in capacitance upon interaction with detector. The sensor is shielded to reduce the effects of outside interference.

The flexible electroluminescent capacitive sensor system contains an electroluminescent capacitive sensor, a capacitance meter, and an electroluminescence electronic drive. The capacitive sensor contains in order a first barrier layer, a first transparent electrode layer, a phosphor layer, a second electrode layer, a flexible, resilient dielectric layer, and an electrically conductive reference layer. The capacitance meter is electrically connected to the electrically conductive reference layer and either the second electrode layer or the first electrode layer. The electroluminescence electronic drive is electrically connected to the first transparent electrode layer and the second electrode layer. The first electrode layer has a first voltage, the second electrode layer has a second voltage, and the conductive reference layer has a third voltage. The first or second electrodes may be patterned to allow for multiple sensor regions integrated into a single sensor structure.

A method for measuring a thickness of a non-conductive coating on a semi-conductive substrate includes placing a pair of conducting plates in contact with the non-conductive coating. A capacitance value of the non-conductive coating in combination with the semi-conductive component is measured using a capacitance meter. The measured capacitance value of the non-conductive coating in combination with the semi-conductive component is then used to determine an independent capacitance value of the non-conductive coating. The thickness of the non-conductive coating is directly related to the independent capacitance value of the non-conductive coating.

The invention relates to a device and a method of magnetic levitation molecular pump radical protective bearing detection. The device of the magnetic levitation molecular pump radical protective bearing detection includes an analog rotor which is prepared by insulation materials and loaded into a magnetic levitation molecular pump and capable of driving a radial protective bearing inner ring to revolve, an electric conduction component connected with the radial protective bearing inner ring, and a capacitance meter. The capacitance meter comprises two connecting terminals, wherein a first connecting terminal is connected with the electric conduction component and a second connecting terminal is connected with a pump body. The capacitance meter measures capacitance value between the radial protective bearing inner ring and the pump body. According to the capacitance change situation between the radial protective bearing inner ring and the pump body, the device of the magnetic levitation molecular pump radical protective bearing detection can effectively obtain current information of the protective bearing, prevent the protective bearing from causing terrible accidents. The device of the magnetic levitation molecular pump radical protective bearing detection is high in detection efficiency, low in cost, and capable of effectively avoiding the terrible accidents and relevant economical loss caused by failure of the protective bearing.

The invention provides a method for accumulating the aggregate capacitances of a smart meter capable of realizing bidirectional metering, which comprises the steps of accumulating forward and reverse aggregate capacitances, and accumulating the forward and reverse aggregate capacitances of each rate, wherein an energy register adopts a 'read / reset' mode. In the two steps above, only the integer arithmetic is used, but the digital accuracy and the accurate accumulation of aggregate capacitances can be guaranteed, and most of data processing can be completed only by using an addition or subtraction method. In case of applying the method to an MCU (micro-programmed control unit), the cost of metering devices can be reduced, and the calculation speed is faster; and the testing personnel can read the aggregate capacitance metered by an electric energy meter at any time, and compares the metered aggregate capacitance with a standard aggregate capacitance, thereby calculating a metering error. By using the method provided by the invention, the forward and reverse aggregate capacitances can be respectively accumulated according to the requirements of an electric power company, and the combined aggregate capacitance also can be calculated.

The invention relates to a detection device and method for rebar in concrete, and provides a static field capacitance principle-based low-cost, high-accuracy and nondestructive detection device and method. Various types of targeted detection are implemented on the rebar in the concrete, and an accurate and convenient detection result comprising rebar position, size and corrosion quantity is expected to be acquired, and operation efficiency of detection, building engineering acceptance and detection, reinforcement and identification of an existing rebar concrete structure are improved. The detection device comprises an electrode plate, a DC power supply and a data acquisition processing device, wherein the data acquisition processing device comprises a capacitance meter, a display module, an operation module, a processing module and a data connection line socket, wherein an angular frequency of the capacitance meter is set as 10KHz, the display module is used for displaying a numericalvalue obtained after detection of a capacitance sensor, the operation module is used for performing artificial actual operation and inputting special engineering information to set a parameter, the processing module is used for performing data analysis statistics on the numerical value measured by the capacitance meter and other relevant numerical values, and the data connection line socket is used for connecting the electrode plate.

A method for determining a flow property of a fluid flowing through a conduit provided with a capacitance meter having an upstream and a downstream annular capacitance sensor, wherein each annular capacitance sensor having at least three sensor electrodes, which sensor electrodes are arranged around the circumference of the conduit, the method having selecting, for each annular capacitance sensor a set of measurement capacitors, wherein a measurement capacitor is formed by two measurement electrodes, and wherein a measurement electrode consists either of a single sensor electrode or of at least two interconnected sensor electrodes; measuring at several moments during a time interval a capacitance of each measurement capacitor of each annular capacitance sensor; determining cross correlations between capacitances measured during the time interval at the upstream annular capacitance sensor and capacitances measured during the time interval at the downstream annular capacitance sensor; and determining the flow property from the cross correlations.

Disclosed is a toroidal core current transformer comprising a primary conductor which penetrates the toroidal core and a secondary winding that is wound around the toroidal core. A measuring shunt (Rsh) or a load (Z b).

In a capacitor equivalent circuit model for when a DC voltage is superimposed on a signal, using an equivalent circuit for when the DC voltage is not applied as a baseline, a voltage-controlled current source or voltage source that adjusts the signal in accordance with the superimposed DC voltage is substituted with a portion that represents the capacitance of the equivalent circuit. The voltage-controlled current source or voltage source is then modeled using a current or voltage approximation formula that describes the change in the signal resulting from the changes in the characteristics of the capacitor due to superimposition of the DC voltage, and a device that represents the capacitance of the equivalent circuit behaves similar to a variable device due to superimposition of the DC voltage. This approximation formula reduces computational load on a simulator and prevents issues such as divergence.

The invention discloses a method for suppressing DC voltage fluctuation based on an MMC virtual capacitor. The method comprises the steps: controlling electrical parameters of an MMC through a presetcontrol strategy, enabling the control strategy to be equivalent to a virtual capacitor with adjustable capacitance, and adjusting the virtual coefficient of the virtual capacitor according to the amplitude of voltage fluctuation so as to suppress the DC voltage fluctuation. According to the invention, by presetting the control strategy in the MMC, the converter and the virtual capacitor can showa physical behavior similar to the parallel connection of the converter with the capacitor with adjustable size and the direct-current power supply network, and the virtual capacitor shows the behavior of the MMC after the control strategy provided by the invention is carried out; and specifically the virtual capacitance is changed by adjusting the virtual coefficient, so that the inertia of the direct-current power supply network is influenced, the voltage fluctuation suppression capability of the direct-current power supply network can be enhanced, and the stability of the direct-current power supply network is improved.

A capacitance meter including an AC source providing a measurement voltage with a measurement frequency to a capacitor. A current sensor is arranged to measure a current going to or from the capacitance meter. A voltage sensor is arranged to measure a voltage over the capacitor. A capacitance calculation unit is arranged to calculate, using a controller, a capacitance of the capacitor using a measured current from the current sensor, a measured voltage from the voltage sensor and the measurement frequency. The capacitance meter is arranged to obtain measurements using the current sensor and the voltage sensor during a measurement duration. The measurement frequency and the measurement duration are selected such that the measurement duration equals a multiple of the period of the measurement frequency, and the measurement duration equals a multiple of the period of a mains electricity.

A bearing arrangement includes a bearing having an inner race and an outer race and a plurality of rolling elements arranged between the inner and outer race such that the first race is rotatable relative the second race; bearing lubricant arranged within the bearing to lubricate the rolling elements. The bearing arrangement provides a first electrically conductive portion and a second electrically conductive portion, the first and second electrically conductive portion being electrically insulated and arranged such that at least a portion of the bearing lubricant is located between the first and second electrically conductive portion; and a capacitance meter having a first electrode connected to the first electrically conductive portion and a second electrode connected to the second electrically conductive portion, configured to measure a capacitance between the first ring and the second ring to determine a water content in the lubricant based on the measured capacitance.

The invention discloses a capacitance defect detection method based on machine vision. The detection method comprises the following steps: step A, image data acquisition: a capacitor is fixed to a motion control system; the motion control system rotates the capacitor; the image acquisition system acquires image data of the surface of the capacitor in the rotating process of the capacitor to obtaina height map and a depth map of the surface of the capacitor; the image acquisition system preprocesses and outputs the image data; B, a capacitor surface coding template is created; and C, defect detection. Compared with the prior art, the capacitor defect detection method has the advantages that the type of the capacitor can be detected, convex hull defects and concave defects on the surface ofthe capacitor can be detected, and only when the type of the capacitor is detected to be qualified, the defect detection system can carry out encapsulation position detection; only when the encapsulation position is detected to be qualified, the defect detection system can detect the surface defects of the capacitor, so that the consistency of the capacitor can be ensured, the capacitor defects can be detected, the reliability and accuracy are high, and the detection speed is high.

The invention discloses a shock wave pressure measuring device for a parallel-combined dielectric elastomer, and a test method, and the device comprises a base plate and four groups of rectangular sensing units laid on the upper surface of the base plate, wherein four corners of each group of sensing units are fixed on the base plate by angle blocks through screws, the sensing units are composed of a single-layer dielectric elastomer thin film and a flexible conductive cloth both having the upper and lower surfaces evenly brushed with flexible electrodes, the flexible electrode on the upper surface is in screw connection to the screw at the left bottom of the sensing units through the flexible conductive cloth, the flexible electrode on the lower surface is in screw connection to the screwat the right bottom of the sensing units through the flexible conductive cloth, and the bottom end of the screw at the left bottom and the bottom end of the screw at the right bottom of the four groups of sensing units are respectively connected and accessed into a capacitance meter in sequence through wires. At the same time, the invention discloses a test method of the measuring device. The invention improves the accuracy of shock wave pressure measurement by means of parallel combination, and the device has the characteristics of low production cost and simple measurement method.

A sheet depositing device for a sheet processing apparatus, includes a feeding section for sequentially feeding sheets or sets of sheets from the sheet processing apparatus, at least one sheet stacking element movable along a guide, for facilitating depositing the sheets or sets of sheets fed by the feeding section, and a sensor arrangement for detecting the position of a sheet stacking element along the guide. The sensor arrangement includes a stationary linear array of active elements and a passive element moving in unison with the sheet stacking element. The active and passive elements are of a kind that interact through the use of electric or magnetic fields. Examples of such sensors are an array of conductive fields arranged in parallel to a conductive strip or a second array of conductive fields, and a conductive plate connected to a capacitance meter; and an array of Hall-effect sensors and a magnet.

The invention relates to a non-invasive method and system for detecting in-vivo tissue feature information. The method comprises the following steps: simultaneously applying a plurality of alternatingcurrents with different frequencies to a human body or an animal body; after the modulated voltage signal is received, demodulating the received signal; extracting information from the cardiovascularsystem and surrounding tissue from the carrier of the specified frequency; separating information of the cardiovascular circulatory system from information of surrounding tissue by performing a system identification or channel estimation procedure; respectively calculating the resistance and capacitance of the cardiovascular system and surrounding tissues thereof; representing the state of the bodily fluid and cardiovascular cycle through the calculated resistance and capacitance. Therefore, the corresponding state information can be accurately and reliably obtained, and the target tissue canbe conveniently and accurately measured to obtain the health state.

The invention relates to an enhanced HEMT radio frequency device with a gate-drain composite step field plate structure, and a preparation method thereof. A p-GaN region is arranged on the surface of a barrier layer, a gate is arranged on the p-GaN region, a gate step field plate is arranged on the side wall, facing a drain, of the p-GaN region, and a drain step field plate is arranged on the side wall, facing the p-type GaN region, of the drain. The step field plate comprises at least two sub-field plates, and the width of each sub-field plate is gradually reduced from top to bottom. Through the arrangement of the gate-drain composite step field plate, the electric field distribution of the side, close to the drain, of the gate and the electric field distribution of the side, close to the gate, of the drain are changed, the average electric field intensity between the gate and the drain is improved, and the voltage withstanding performance and reliability of the device are improved; and the p-GaN region is arranged below the gate, and the enhanced HEMT radio frequency device has smaller gate-drain capacitance and shows higher cut-off frequency in combination with the gate-drain composite step field plate structure.

The invention provides a measuring method for capacity parameters of each chip on a silicon chip, comprising the steps of selecting a tested silicon chip, transferring a measuring probe of a capacitance meter to be above each chip on the tested silicon chip to carry out a new round of non-contact idle measurement, so as to obtain zero capacitance data of each chip in different positions on the tested silicon chip under current measurement environment; providing a to-be-tested silicon chip, enabling the measuring probe to respectively contact with each chip on the to-be-tested silicon chip to carry out formal measurement, wherein after each chip is measured, subtracting the measurement value by the zero capacitance data of the chip in the same position on the tested silicon chip, so as to obtain the actual capacitance of each tested chip on the to-be-tested silicon chip; comparing the actual capacitance of each tested chip after calculation zero setting with a code value respectively, judging whether the chip is qualified or not, and recording and storing as data. According to the invention, distribution effect and parasitic effect of capacitance of the back and the surface of the silicon chip can be overcome, quick and accurate measurement can be carried out on small capacitance parameters of each chip on the silicon chip, and the requirement of mass production can be met.

A pressurized gas storage system includes an outer shell having an inner and outer surface. The inner surface defines an inner volume for holding a pressurized gas. A first electrically conductive layer is attached to the outer shell. An inner liner is disposed over the inner surface. A second electrically conductive layer is attached to the inner liner. A capacitance meter measures the capacitance between the first and second electrically conductive layers wherein a change in capacitance indicates buckling in the storage system.

Provided is a fuel oil gauge (15), comprising: a columnar interior structural body (27) formed from an insulator; a hollow cylindrical exterior structural body (23) formed from an insulator, which is positioned on the exterior circumference side of the interior structural body (27) around the total perimeter thereof with a gap therebetween; an interior electrode (29) which is affixed to the exterior circumference face of the interior structural body (27); and an exterior electrode (25) which is affixed to the interior circumference face of the exterior structural body (23). The fuel oil gauge (15) measures capacitance between the interior electrode (29) and the exterior electrode (25), and detects the level of fuel present between the interior electrode (29) and the exterior electrode (25). The exterior structural body (23) further comprises a plurality of exterior side through holes (31) that allow electrical charge to move from the exterior circumference face thereof to the exterior electrode (25).