258 results about "Capacitive measurement" patented technology

The invention relates to the field of motor health management and predictive maintenance, in particular to a motor stator winding insulation state evaluation method and system based on a digital model. Comprising the following steps: S1, collecting high frequency of a motor stator winding, and generating multi-physical-quantity real-time data; s2, calculating a dynamic capacitance reference value according to real-time data of multiple physical quantities; s3, performing subtraction operation on the high-frequency equivalent capacitance measurement value and the dynamic capacitance reference value, and extracting an insulation degradation residual signal; s4, constructing a self-adaptive dynamic detection threshold according to multi-physical-quantity real-time data; s5, judging whether the absolute value of the insulation degradation residual signal is greater than a self-adaptive dynamic detection threshold or not: if so, judging that an insulation degradation event occurs; if not, judging that the operation state is a normal operation state; and S6, in response to the insulation degradation event, updating the insulation degradation index, and generating insulation state evaluation based on the updated insulation degradation index. According to the invention, false alarm under severe load fluctuation is avoided, and the accuracy and reliability of evaluation are significantly improved.

The invention discloses an insulation resistance and capacitance measuring circuit and method based on monopulse double-edge analysis, and relates to the related field of the electrical insulation online monitoring technology, and the circuit comprises a detected object and an insulation detection circuit. The insulation detection circuit comprises a controlled pulse voltage source, a coupling resistance network, a current sensor, a switch control module, a signal modulation circuit and a processor. The measurement method implemented based on the circuit comprises the following steps: injecting a common-mode voltage pulse into a transmission line of the power transmission system by adopting a pulse transmitter; pulse current response is collected in real time, a current oscillogram is drawn, and a three-point sampling method is introduced to record a current value for insulation impedance parameter calculation; according to a load condition, a double-edge verification method is applied based on a pulse current attenuation characteristic, and insulation impedance parameters including a resistive component and a capacitive component are independently calculated by analyzing a pulse current rising edge and a pulse current falling edge. According to the invention, non-intrusive synchronous monitoring of resistive and capacitive components of line-to-ground impedance is realized, and the detection precision is improved.

The invention relates to a circuit arrangement (1) for multi-zone heating operation, comprising: a plurality of heating wires (2, 2 '), which can be supplied in parallel by a heating voltage, for heating a touch surface (19) comprising a plurality of zones (20, 20'); wherein a respective heating wire (2, 2 ') is associated with a zone (20, 20'); at least one first switching element (3a, 3a ') for each heating wire (2, 2'), which is coupled between the heating wire (2, 2 ') and one of the two different heating potentials (VH +, VH-) of the heating voltage in such a way that, in a heating mode, a heating current is applied to the respective heating wire (2, 2') in the conducting state of the first switching element (3a, 3a '), and interrupting the heating current in the OFF state of the first switching element (3a, 3a '); a control circuit (12, 6a, 6a ', 6b, 6b') configured to generate, for each heating wire (2, 2 '), individual pulse width modulated first control signals (ST1, ST1') to switch the first switching elements (3a, 3a ') between an on state and an off state, respectively, the individual pulse width modulated first control signals being applied to first control terminals (Ga, G'a) of the first switching elements (3a, 3a'), respectively; wherein the control circuits (12, 6a, 6a ', 6b, 6b') are further designed to apply a respective associated heating current to a plurality of heating wires (2, 2 ') in a common heating stage in parallel, in an overlapping manner and / or in an alternating manner, and wherein at least two of the first control signals (ST1, ST1') differ in terms of their duty cycles.

A capacitance measurement circuit includes an analog front-end (AFE) circuit with current mirror circuits, a parasitic capacitor, an AD converter, an output shift register, and a controller. The controller disconnects a capacitor to be measured and connects one current mirror circuit to record an AFE output voltage VN collected at an inverting input terminal of the AD converter, then connects the capacitor to be measured to collect an AFE output voltage VP at a non-inverting input terminal of the AD converter, and converts a value of (VP−VN) into a first digital signal; determines, based on the value of the first digital signal, a connection number m of the current mirror circuits, controls the analog front-end circuit to connect m current mirror circuits, and repeat the steps to obtain a second digital signal; and shift the second digital signal based on the connection number m to obtain a capacitance measurement value.

The invention relates to the technical field of flexible electronics and sensing, in particular to a capacitive flexible pressure sensor based on a barium titanate composite dielectric layer, which sequentially comprises a lower electrode layer, an upper electrode layer, a lower electrode layer and an upper electrode layer from bottom to top, the composite dielectric layer is arranged on the lower electrode layer and is formed by compounding an elastic polymer matrix and a high-dielectric-constant barium titanate (BaTiO3) filler; the upper electrode layer is made of a flexible conductive material and is arranged on the composite dielectric layer; the lower electrode layer and the upper electrode layer are connected with an external capacitance measuring circuit through wires. According to the sensor disclosed by the invention, the comprehensive performance of high sensitivity, wide detection range, low hysteresis and excellent cycle stability is realized by optimizing the shape of the barium titanate filler, surface modification and composite structure design.

The invention provides an excitation amplitude automatic closed-loop control system and method for a DLCP test. The system comprises a multi-frequency alternating current excitation and direct current bias voltage applying module which is used for automatically applying alternating current excitation signals and direct current bias voltage signals according to a preset excitation amplitude sequence under a plurality of test frequencies; the PID closed-loop control module is used for performing closed-loop correction on the applied voltage according to the response of the test port of the tested semiconductor device, so that the condition of the applied voltage at the test port meets a preset requirement; the capacitance measurement module is used for acquiring an equivalent capacitance response signal of the tested semiconductor device; the capacitance test data caching module is used for performing associated marking and classified caching on the capacitance test data according to the test frequency, the excitation level and the bias voltage set point; and the main control module is used for coordinating automatic test processes under the conditions of a plurality of test frequencies and different excitation amplitudes and outputting corresponding capacitance test data so as to improve the consistency, stability and automation degree of the DLCP test.

The invention belongs to the technical field of nuclear power, and particularly relates to a ground capacitance measurement method based on series capacitance and high-frequency signal injection. In order to solve the problem that a traditional signal injection method cannot accurately calculate the ground capacitance level of a power distribution network, the invention provides a ground capacitance measurement method based on a series capacitor and high-frequency signal injection. The leakage inductance of the voltage transformer is accurately measured by injecting the high-frequency signal, so that a resonance point is convenient to find during frequency sweeping, and the resonance point measured during frequency sweeping is more accurate.

A measuring system for characterizing a multilayered structure with layer-by-layer different ohmic properties, having a sensor module, an electrical switching device, and a measuring electronics unit. The sensor module has more than two planar coils arranged in a stack, and the electrical switching device is contacted with the planar coils and is configured to connect these coils to the measuring electronics unit such that the coils are switchable between a measuring configuration and a reference configuration. In the measuring configuration, the planar coils at least partially form an optionally inductive or capacitive measuring sensor, with the detection area extending outside the sensor module for determining a property of a low and / or high-resistance layer of the structure. In the reference configuration, the planar coils at least partially form an optionally inductive or capacitive reference sensor, with the detection area extending essentially inside the sensor module for determining a sensor module property.

The invention discloses a low-temperature safety valve leakage detection device based on electrical capacitance tomography, which comprises a liquid nitrogen storage container, a test container, a low-temperature stop valve, a detected low-temperature safety valve, a constant-temperature water bath device, a flow meter, a water tank, a leakage detection pipeline, a capacitance measurement system and a data acquisition and software system, the capacitance measuring system comprises a plurality of groups of copper electrode plates and a processing module, each group of copper electrode plates comprises two copper electrode plates arranged on two opposite side parts of the water tank, and the copper electrode plates are used for capturing bubbles formed by the low-temperature gas in the cavity and acquiring capacitance signals; and the copper electrode plate is electrically connected with the data acquisition and software system through the lead electrode plate connector and the shielding coaxial cable. Insulation supports are arranged between the water tank and the copper electrode plates, the interior of the water tank is divided into a plurality of cavities, and communication gaps are formed between the adjacent cavities. The invention further discloses a low-temperature safety valve leakage detection method based on electrical capacitance tomography. According to the method, the accuracy and comprehensiveness of calculating the leakage rate of the low-temperature gas are improved.

The application discloses a self-adaptive capacitive liquid level sensor, which comprises a metal cylinder, a PCB circuit board, a reference electrode and a measuring electrode which are arranged on the PCB circuit board and are insulated from each other, the reference electrode is arranged at the bottom end of the PCB circuit board and is used for forming a reference capacitor with the metal cylinder, the measuring electrode is arranged above the reference electrode and is used for forming a measuring capacitor with the metal cylinder, and a controller is arranged for calculating the liquid level height after compensating the measuring capacitor by the reference capacitor. The capacitive liquid level sensor is provided with the reference electrode and the corresponding algorithm steps, so that the calculation of the liquid level height is irrelevant to the dielectric constant of the medium, thereby avoiding the detection error caused by the change of the dielectric constant, and the sensor can be applicable to the liquid level detection of different oil products in different environments.

The invention discloses a machine learning icing recognition system and method for a skymirror system, and relates to the technical field of measurement, and the method comprises the following steps: S1, transmitting an optical signal to an ice layer, and judging the type of the ice layer based on the features of the returned optical signal; s2, acquiring an ice layer capacitance value, and calculating the thickness of the ice layer according to the capacitance value; s3, acquiring an image containing a water body, a sensitive zone at the junction of the water and the ice layer and the ice layer, and calculating the thickness of the sensitive zone according to image features and optical signal features; s4, acquiring the signal-to-noise ratio of the capacitance measurement data, determining a first weight coefficient according to the signal-to-noise ratio, and determining a second weight coefficient according to the contrast ratio of the image; and S5, performing weighted fusion on the capacitance measurement thickness and the image thickness based on the first weight coefficient and the second weight coefficient to obtain the corrected ice layer thickness. According to the invention, through multi-sensor data fusion, weight dynamic distribution and construction of prediction modeling, the problems of ice type identification, thickness measurement and growth law prediction are solved.

The wearable electronic device may be equipped with sensors to measure heart rate, blood oxygen levels, respiratory rate, blood pressure, blood glucose levels, and skin temperature. The device may include graphene-based sensors to measure heart rate, blood oxygen levels, respiratory rate, blood pressure, blood glucose levels, and skin temperature. The device may include a process that uses capacitive measurements to determine reliability of biosensor measurements. Capacitive measurements may be made on the device and a quality of contact between the device and the wearer may be determined. When the quality of contact between the device and its wearer is insufficient for reliable biosensor measurements, the device may display an alert to the wearer.

The invention discloses a capacitor health degree detection method and equipment, and the method comprises the steps: applying a sine wave test signal to a to-be-detected capacitor, obtaining a current signal and a voltage signal of the to-be-detected capacitor, calculating the phase angle of the to-be-detected capacitor through the current signal and the voltage signal, calculating the equivalent series resistance and capacitive reactance of the to-be-detected capacitor based on the phase angle, and obtaining the health degree of the to-be-detected capacitor. And calculating the capacitance of the to-be-measured capacitor based on the capacitive reactance, calculating the loss tangent value of the to-be-measured capacitor according to the equivalent series resistance and the capacitive reactance, and predicting the health degree of the capacitor according to the equivalent series resistance, the capacitance value and the change of the loss tangent value. Therefore, when the capacitor operates normally, current and voltage signals of the capacitor can be measured actively, and the health degree of the capacitor can be calculated by combining the equivalent series resistance, the capacity and the loss tangent value of the capacitor, so that the health condition of the capacitor can be evaluated more accurately and comprehensively, and early warning and troubleshooting can be carried out on the abnormal capacitor as soon as possible.

The invention discloses a self-adaptive optical distortion compensation device and compensation method based on high-speed closed-loop control, and the device comprises an optical path front-end interface which is used for connecting a coupling wind tunnel or a laser emission system; the wavefront sensor is used for measuring a local wavefront slope by adopting a distributed array; the FPGA controller comprises a wavefront reconstruction processor and a closed-loop logic controller and is used for reconstructing wavefront and generating a control instruction; the MEMS deformable mirror array comprises a plurality of MEMS drivers and is used for correcting a wavefront phase; the feedback monitoring module is used for performing dual verification through deformation capacitance measurement and CCD image feedback; and the imaging / laser output end is used for converting the corrected optical signal into an image and outputting the image. The method can be widely applied to the fields of high-speed aircraft wind tunnel testing, laser communication, infrared imaging guide head calibration, high-energy laser beam shaping and the like, a programmable hardware platform, a high-speed parallel operation structure and a predictive control algorithm are introduced, and unprecedented sub-microsecond closed-loop compensation is achieved.

The invention relates to a capacitance measurement device and a capacitance measurement method based on the capacitance measurement device. The capacitance measurement device comprises a first voltage source, a second voltage source, a first range resistor, a vector voltage acquisition module and a vector current acquisition module. The first voltage source, the capacitor to be measured and the vector current acquisition module are connected in series to form a first loop; the second voltage source, the first measuring range resistor and the vector current acquisition module are connected in series to form a second loop; the first measuring range resistor is a measuring range resistor with a variable resistance value; the vector voltage acquisition module is connected in parallel with the two ends of the capacitor to be measured. According to the embodiment of the invention, capacitance measurement can be realized, the capacitance measurement accuracy is improved, the capacitance measurement range is expanded, the capacitance measurement efficiency is improved, and the capacitance measurement operation complexity is reduced.

A capacitance measuring device and capacitance measuring method are configured to batch test the capacitance parameters of chips. The capacitance measuring device includes: a measurement circuit board, including: a test station configured to install the chip to be tested; and a reference capacitor, wherein a first end of the reference capacitor is electrically connected to a first pin of the chip to be tested installed at the test station at a first node, a second end of the reference capacitor is configured to receive a first measurement signal, and a second pin of the chip to be tested installed at the test station is configured to receive a second measurement signal; and an automatic tester is electrically connected to the measurement circuit board and configured to provide the first measurement signal and the second measurement signal, and determine the capacitance parameters of the chip to be tested based on the signal at the first node, wherein the first measurement signal and the second measurement signal are both sine signals or cosine signals, and the phase difference between the first measurement signal and the second measurement signal is (2n+1)π, where n is an integer.

An electromechanical system includes a frame; an element movable relative to the frame, the movable element comprising a membrane and a rigidifying structure for the membrane; a capacitive measurement or actuation device; a first transmission device for a movement between the movable element and the capacitive measurement or actuation device, the first transmission device being rotatably movable relative to the frame by a plurality of first pivot hinges; in which system: a first opening is arranged in the movable element; the frame includes a first island extending into the first opening; and the first transmission device is connected to the first island via one of the first pivot hinges.

The invention discloses a flexible capacitive pressure sensor and a preparation method, and relates to the technical field of flexible capacitive pressure sensors.The flexible capacitive pressure sensor comprises a shell, a second binding post arranged at one end of the shell, a shell cover arranged at the other end of the shell and a first binding post arranged on the shell cover, an upper packaging layer is arranged in the shell, an upper electrode layer is arranged on one side of the upper packaging layer, and a lower electrode layer is arranged on the other side of the upper packaging layer; a middle dielectric layer is arranged on one side of the upper electrode layer, a lower electrode layer is arranged on one side of the middle dielectric layer, and a lower packaging layer is arranged on one side of the lower electrode layer; conductive film structures are arranged between the lower electrode layer and the middle dielectric layer and between the upper electrode layer and the middle dielectric layer; a sealing assembly is arranged in the shell cover; an extrusion assembly is further arranged in the shell cover; by using the sealing assembly, the sealing performance between the shell and the shell cover is improved, external moisture and dust are prevented from entering the shell, the accuracy of capacitance measurement is improved, and the service life of the flexible capacitive pressure sensor is further prolonged.

An analyte in a liquid sample is detected using a capacitive sensor having electrodes and a sensor surface, and a signal processor. The sample is dried to reduce its liquid content, and capacitive measurements are made after the drying and preferably also before the drying. The sample may include particles, and the analyte is part of or attached to the particles, and the particles provide a major part of the capacitance change compared to absence of particles. In another example the particles are degenerative and form an integral mass upon application of heat, enhancing the extent of capacitance change.

A haircare device comprising one or more capacitive sensors is described. Each capacitive sensor includes a structure defining a gap of a predetermined size for receiving a volume of hair. A first electrode and a second electrode are arranged on either side of the gap for performing a capacitive measurement on hair received in the gap.

The invention provides a robot multi-mode touch sensing device based on electrical capacitance tomography, and the device comprises a flexible electrical capacitance tomography sensor which is disposed at an execution tail end of a robot and is used for sensing capacitance measurement values in a non-contact stage and a contact stage respectively; the multi-mode signal processing unit is used for acquiring the capacitance measurement value in real time, processing the capacitance measurement value to generate multi-mode touch information and feeding back the multi-mode touch information to the robot control system; wherein object category identification is carried out based on the capacitance measurement value in the non-contact stage, if the identified object is a contactable object, ECT image reconstruction is carried out by using the capacitance measurement value in the contact stage to obtain a contact image, and the contact image is converted into contact force distribution through a gray scale-pressure mapping relation. And carrying out object contour extraction by using the geometric features of the contact image. The adaptability and safety of the robot in a complex environment are improved, and the method is particularly suitable for the field of robots needing fine operation and environment interaction.

The invention provides a micro capacitance measurement system and method. The system comprises an integration module, a main controller, a display module and an upper computer module. The integrated module generates a square wave signal by controlling the charging and discharging process of the capacitor to be detected; the main controller is used for collecting the square wave signal generated by the integrated module and calculating a capacitance value to be measured through the square wave signal; the display module is used for displaying the measured capacitance value in real time; and the upper computer module is connected with the main controller to realize remote monitoring and storage of data. According to the invention, by improving the measurement technology, the measurement precision of the picomethod capacitance is improved.

A method and apparatus for plasma assisted semiconductor processing is provided. The method comprises: a) providing a substrate at each of the plurality of stations; b) allocating RF power comprising a first target frequency to a plurality of stations, thereby generating plasma within the stations, where the RF power is allocated according to RF power parameters configured to reduce variations between stations; c) tuning an impedance matching circuit for a first station included in the plurality of stations while distributing RF power to the first station by: i) measuring a capacitance of a capacitor in the impedance matching circuit without disconnecting the capacitor from the impedance matching circuit; and ii) adjusting the capacitance of the capacitor according to the capacitance and the RF power parameter measured in (i); and d) performing a semiconductor processing operation on the substrate at each station.

Provided is a technique for improving the accuracy of an electrical parameter determined using a sensor in a plasma processing device. The plasma processing device comprises a plasma processing chamber, a substrate supporting unit which is disposed within the plasma processing chamber and which includes an electrically conductive base and an electrostatic chuck disposed on the electrically conductive base, an RF power source which is electrically connected to the electrically conductive base via an RF transmission line, a sensor which is configured to detect at least one first electrical parameter at a node on the RF transmission line, a first storage unit which is configured to store a measurement result obtained by measuring the capacitance of the electrostatic chuck, and a control unit, wherein the control unit is configured to determine at least one second electrical parameter of a substrate on a substrate supporting surface on the basis of the at least one first electrical parameter detected by the sensor and the measurement result of the capacitance stored in the first storage unit.

The application discloses a kind of system ground capacitance measurement method and system, sampling the secondary side opening delta voltage of voltage transformer of set length voltage as first voltage sequence, sampling after t1 time when direct current power supply access voltage transformer secondary side opening delta end, t2 time when direct current power supply exits voltage transformer secondary side opening delta end, the t2 time is after t1 time, the set length is equal to t1+t2;First voltage sequence is delayed t2 time and obtains second voltage sequence, the difference of first voltage sequence and second voltage sequence is calculated as third voltage sequence;According to the oscillation frequency of third voltage sequence, the system ground capacitance value is calculated.It is less dangerous to the throw of direct current power supply in voltage transformer secondary side, and the hardware implementation effect is relatively easy, the accuracy of measured ground capacitance value is high, the error is small, is not influenced by power grid symmetry, application occasion is wider, adapts to the power grid of multiple neutral point grounding mode.

This invention relates to an intelligent flow sensing method and system for cold-pressing amorphous alloy powder, belonging to the field of flow measurement technology. The method includes constructing an acoustic emission feature vector; inputting the original capacitance measurement tensor and acoustic emission feature vector into a capacitance tomography reconstruction algorithm to construct a multi-frequency dielectric-mechanical coupled Gaussian mixture model; performing soft classification decoupling on the dielectric constant distribution matrix to generate a shear band density field and a porosity distribution field; introducing the shear band density field to perform free volume correction on the powder's apparent density distribution field, and solving to obtain a real-time flow characteristic scalar; inputting this time-series graph structure data into a graph neural network-long short-term memory coupled model; comparing the shear band network connectivity with a threshold in real time; and constructing a multi-objective cost function to achieve coordinated control of high-precision flow tracking and active suppression of shear band instability during cold pressing. This invention improves the flow sensing accuracy, instability early warning timeliness, and process control coordination of cold-pressing amorphous alloy powder.

Disclosed in the present invention is a pyramid-like multi-modal three-dimensional force measurement device, comprising a cylindrical thin wall, four spring plates, a multi-modal measurement module, a needle fixing structure and a signal processing module, wherein the four spring plates are symmetrically arranged within the cylindrical thin wall, one end of each spring plate is fixed to the edge of the inner wall of the cylindrical thin wall, the other ends of the spring plates extend towards the interior of the cylindrical thin wall and converge on a central connection block, and each spring plate is provided with a strain gauge, a magnetization region, and a first pole of a capacitor; a Hall magneto-electric element is provided on the inner wall of the cylindrical thin wall at a position opposite each magnetization region; the needle fixing structure is configured to fix an object to be subjected to measurement; second poles of capacitors are arranged on a needle-like elongated sharp object to be subjected to measurement; the multi-modal measurement module comprises a resistive strain gauge measurement module, a Hall magneto-electric measurement module, and a capacitive measurement module; and the signal processing module is configured to fuse three-dimensional forces calculated by the resistive strain gauge measurement module, the Hall magneto-electric measurement module and the capacitive measurement module and output the result.

The invention relates to a device (200) for the capacitive measurement of a quantity of fluid in a tank, comprising: - an external electrode (102) immersed in the tank, - a longitudinal internal electrode (104) inserted into and centred inside the external electrode; and - measuring electronics (110) for: · creating, between the electrodes (102, 104), an alternating electrical potential difference (VG), different from a ground potential at at least one measuring frequency, and · measuring an electrical signal relating to a capacitance seen by one of the electrodes (102, 104) and representative of the quantity of fluid present in the tank; the outside width (Le) of the internal electrode (104) being less than or equal to half the inside width (Lt) of the external electrode. The invention also relates to a tank equipped with such a measuring device and to a vehicle equipped with such a tank or with such a device.

This invention relates to the field of semiconductor device measurement technology, and proposes a method for measuring the nonlinear output junction capacitance of semiconductors based on fitting iteration. This method first constructs a junction capacitance extraction circuit, and then acquires the turn-off transient waveform of the device under test through a test platform. Finally, it uses Fast Fourier Transform to extract the oscillation frequency f. exp Based on the relationship between the oscillation frequency, junction capacitance, and parasitic parameters, the initial junction capacitance C is deduced. oss Subsequently, a hyperbolic tangent function was used for fitting, and the fitting parameters were optimized using the least squares method to obtain the preliminary junction capacitance C under different voltage levels. oss - Test voltage u dc Based on the relationship curve, a simulation circuit for the oscillation frequency was further constructed to obtain the simulation frequency f. m and f m with f exp The fitting curve is compared, and if a deviation exists, the fitting curve is adjusted and iteratively optimized until the error between two adjacent fitting results is lower than the set error threshold, thus obtaining the final accurate junction capacitance C. oss - Test voltage u dc Relationship curve.

The invention provides a capacitance measurement system based on big data multi-source calculation and a measurement method thereof. Relates to the technical field of electrical measurement and data processing, and comprises a multi-source data acquisition module for performing real-time acquisition on a capacitor through a multi-source sensor to generate multi-source heterogeneous data. And the synchronous sampling module is used for performing unified time synchronization on the multi-source heterogeneous data through a hybrid synchronization mechanism to generate a hybrid synchronization sequence. According to the capacitance measurement system based on big data multi-source calculation and the measurement method thereof, by adopting a self-adaptive correction mechanism and a multi-model self-adaptive weighted fusion technology, a measurement algorithm can be adjusted in real time to cope with dynamic changes under complex working conditions. By combining the powerful processing capability of a big data computing platform, the online monitoring precision of the capacitor is improved, a more reliable basis is provided for life prediction and performance evaluation of the capacitor, and the reliability and high efficiency in industrial production and engineering application are ensured.