180 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 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 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 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.

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.

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.

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.

The invention relates to an electromechanical system (2) comprising: - a frame (10); - a first element (13a) movable relative to the frame (10); - capacitive measurement or actuation means (15') comprising: - a first electrode (151) movable relative to the frame (10); and - at least one electrode fixed relative to the frame (10) and separated from the first movable electrode (151) by a first dielectric medium; - a first movement transmission device (14a) connecting the first movable element (13a) to the first movable electrode (151), the first transmission device (14a) being rotatably movable relative to the frame (10) by means of a plurality of first pivot hinges (16a); - a second element (13b) movable relative to the frame (10), the second movable element (13b) being connected to the capacitive measurement or actuation means (15'), the first movable element (13a) being disposed between the capacitive measurement or actuation means (15') and the second movable element (13b).

The application relates to the technical field of integrated circuits, in particular to an insulating medium capacitor detection structure and method, which comprises a substrate, a common electrode formed on the substrate and a capacitor to be detected, the capacitor to be detected is located in the common electrode of the enclosed structure, and the capacitor to be detected comprises a laminated polar plate one, an insulating medium layer to be detected and a polar plate two; the polar plate one is laterally extended at the edge to form a first lead-out part corresponding to the contact of a first signal pin of a GSG probe; the polar plate two is laterally extended at the edge to form a second lead-out part corresponding to the contact of a second signal pin of the GSG probe; and the common electrode is formed with a third lead-out part corresponding to the contact of a ground pin of the GSG probe. The application can guarantee the accuracy of capacitor measurement and realize the capacitor value measurement of the insulating medium capacitor detection structure with small size and low order of magnitude.

The application discloses a capacitor measurement circuit and a capacitor measurement method, and belongs to the field of semiconductors. The capacitor measurement circuit can accurately measure the junction capacitance of a semiconductor detector (a device to be measured) in real time and on line while applying thousands of volts of direct-current working voltage to the semiconductor detector by coupling an alternating-current test signal in a high-voltage bias loop and directly responding to charge changes by using a detection module, so that the measurement result truly reflects the capacitance characteristics of the device under the actual high-voltage working state. The entire circuit adopts a topology combining alternating-current injection and charge detection, effectively isolates the influence of high-voltage direct current on the precision detection circuit, guarantees high measurement precision and a signal-to-noise ratio, has good electrical safety, and is also compatible with the capacitor measurement demand under conventional low-voltage or zero-bias conditions, thereby improving the universality and application flexibility of the circuit.

The invention belongs to the technical field of self-calibration humidity sensors, and relates to a self-calibration humidity sensor based on FDC1004 + ESP32. The self-calibration humidity sensor comprises an MCU and a humidity measuring unit, a main chip of the humidity measuring unit is FDC1004, an ESP32 serves as a core microcontroller MCU of the self-calibration humidity sensor system, the ESP32 is connected with an FDC1004 capacitance measuring unit and other environment sensors, and multi-parameter environment monitoring is achieved. A plurality of interfaces of the ESP32 are also used for controlling a shutter type structure, indicating an equipment state or connecting a display module to form a complete humidity monitoring system; by means of the Wi-Fi capability of the ESP32, the system can upload historical measurement data, calibration records and sensor state information to the cloud platform; the cloud server can operate a more complex machine learning algorithm, analyze multi-device network data, identify a regional environment mode and find an abnormal mode of the sensor; through the OTA (over the air) technology, the ESP32 can receive algorithm update regularly, and the calibration precision and the intelligent level of the system are continuously improved.

The application provides an end cover, a cylinder and a capacitance measuring device, wherein the end cover has a mounting surface, a plurality of mounting grooves are arranged on the mounting surface from inside to outside and spaced from each other, characterized in that a groove wall is formed between any two adjacent mounting grooves, and the height of the plurality of groove walls gradually decreases from inside to outside. The technical effect of the application is that when the end cover is used for mounting a plurality of cylindrical structures, the relative position between each layer of the groove wall and each layer of the plurality of cylindrical structures can be adjusted in sequence, thereby improving the installation convenience of the plurality of cylindrical structures; the cylinder can arrange as many layers of cylindrical structures as possible in a smaller cylinder diameter due to the use of the end cover; and the capacitance measuring device can arrange as many layers of polar plates as possible in a smaller outer diameter due to the use of the end cover, thereby improving the measurement accuracy.

The application provides a pressure sensor and a manufacturing method thereof, and relates to the field of semiconductor manufacturing. A first electrode is arranged on the side of an insulating medium layer close to a diaphragm, and the first electrode and the diaphragm form a first detection capacitor. Since the area of the first electrode is larger than the area of a second electrode and the area of a third electrode, the capacitance of the first detection capacitor is larger than the capacitance of the second detection capacitor and the capacitance of the third detection capacitor. When there is no signal interference caused by non-pressure factors, the product precision can be improved by calculating the pressure of the measured environment through the measurement data of the first detection capacitor. The second electrode and the third electrode are arranged in the same layer between the insulating medium layer and a fixed substrate, and the second electrode and the third electrode form a second detection capacitor and a third detection capacitor with the diaphragm respectively. According to the capacitance of the second detection capacitor and the third detection capacitor, the signal interference caused by non-pressure factors can be eliminated, and then the measurement result with higher precision can be obtained by combining the capacitance of the first detection capacitor, so that the product precision is improved.

The invention relates to the technical field of data processing, in particular to a device for measuring the thickness of a journal oil film, which is used for improving the measurement accuracy of the thickness of the journal oil film. The device comprises a data acquisition module, an upper computer, a bearing bush and a journal, a shaft neck oil film is arranged between the bearing bush and the shaft neck; the upper computer is used for executing the following steps: acquiring a capacitance measurement value between the bearing bush and the journal, the journal oil film temperature and the environment temperature through the data acquisition module; fusing the journal oil film temperature and the environment temperature to obtain an oil film characterization temperature; and the journal oil film thickness between the bearing bush and the journal is calculated according to the oil film characterization temperature and the capacitance measurement value.

The application provides a capacitive oil level passive detection system and method based on optical fiber energy transmission and communication, and relates to the field of oil level passive detection. The system comprises a host terminal unit, a remote oil level sensing unit and an optical fiber transmission link module. The host terminal transmits energy light to the remote end through the optical fiber, and the remote end is powered by the capacitive oil level sensor after photoelectric conversion. The capacitive measurement module converts the oil level change into an analog voltage signal, forms pulse return communication light after voltage-frequency conversion, returns to the host terminal through the optical fiber, and recovers the oil level information after frequency-voltage conversion. The application realizes complete passive power supply of the remote end by using optical fiber energy transmission, eliminates the electrical safety hidden danger of the airborne fuel tank environment, and is suitable for various airborne fuel measurement systems.

The application discloses an evaluation method for a SF6 circuit breaker contact ablation state, and the method comprises the following steps: acquiring a dynamic capacitance simulation curve of a SF6 circuit breaker contact fracture; calculating a dynamic capacitance measurement curve of the SF6 circuit breaker contact fracture through a capacitance measurement loop; inputting the dynamic capacitance simulation curve and the dynamic capacitance measurement curve into a preset BP neural network to acquire the ablation state of the SF6 circuit breaker contact. The application combines theoretical calculation with experimental measurement, verifies the rationality of the dynamic capacitance curve, adopts a BP neural network intelligent prediction algorithm to process data, deeply mines information of the dynamic capacitance curve, avoids interference of human factors on the result, and improves the objectivity and accuracy of evaluation of the high-voltage SF6 circuit breaker contact ablation state.

A soil moisture sensor includes a first conductive surface, a second conductive surface, and a third conductive surface. The first conductive surface and the second conductive surface form a first capacitor configured to generate a primary electric field, wherein the primary electric field includes primary electric field lines. The soil moisture sensor is characterized in that the soil moisture sensor further comprises a fourth conductive surface, where the third conductive surface and the fourth conductive surface form a second capacitor configured to generate a secondary electric field, and where the secondary electric field comprises secondary electric field lines. Further, the first capacitor and the second capacitor are arranged such that the first capacitor is nested within the second capacitor. In addition, the primary electric field line is separated from the secondary electric field line, so that capacitance measurement of moisture in the surrounding soil is allowed.