839 results about "Capacitance transducer" patented technology

The invention provides a two-phase flow measurement method based on differential pressure capacitance sensing and data knowledge driving. The two-phase flow measurement method comprises the steps that throat extension design is conducted on a standard Venturi tube; a multi-layer capacitive sensor array is embedded into a long-throat-neck Venturi tube, various transmitters are installed on the tube, and differential pressure, temperature and pressure data of the various transmitters are synchronously acquired by using a multi-channel data acquisition module; a configured capacitive sensor array excitation-measurement module is utilized to synchronously acquire capacitor array data; developing a gas-liquid two-phase flow calculation model based on data knowledge driving, and packaging the gas-liquid two-phase flow calculation model in a two-phase flow calculation module; capacitance, differential pressure, temperature and pressure data are input into a two-phase flow calculation module, and field learning is carried out by utilizing actually measured data, so that gas-liquid two-phase flow on-line real-time calculation is realized. The problem that time and space of data measured by traditional tandem type multiple sensors are inconsistent is solved, and the problem that when a traditional venturi tube is used for measuring two-phase flow, the phase volume fraction is lost is solved.

The invention provides an abnormal blood sampling inspection data evaluation processing method and system of a blood sampling system. Wherein the diffusion track dynamic state of an anticoagulant-blood contact surface in a blood sampling tube is tracked in real time, dielectric response waveform distortion characteristics on the two sides are synchronously collected through a capacitance sensor array, and diffusion form parameters are generated; curvature sudden change is analyzed to trigger an acoustic fluid device to modulate audio frequency and flow velocity, and a composite disturbance field is formed; performing capacitance axial scanning on the disturbed mixed fluid, extracting phase angle offset and gradient abrupt change point coordinates, and constructing a dielectric anomaly three-dimensional map; matching a standard dielectric model, positioning a coordinate set of a concentration gradient imbalance area and a coordinate set of an eddy current attenuation area, and generating an anticoagulant abnormal index and a mixed defect matrix in combination with phase angle offset difference; and establishing a data anomaly degree evaluation function based on the anomaly index and the defect matrix, dynamically associating a clinical error threshold, and outputting a test evaluation result. According to the invention, anticoagulant diffusion can be monitored in real time, and the mixing quality error can be accurately evaluated.

The invention provides a self-powered piezoelectric capacitance sensor for dynamic and static cooperative detection and a preparation method thereof, and the sensor comprises a piezoelectric unit which is used for collecting dynamic signals and comprises a top packaging layer, an upper electrode layer, a piezoelectric layer, a lower electrode layer and a central isolation layer from top to bottom; the self-powered capacitor unit is used for collecting static or low-frequency signals and comprises a bottom packaging layer, a combined lower electrode layer, a power supply layer, a radial isolation layer, a dielectric layer and a combined upper electrode layer from bottom to top, the radial isolation layer is arranged on the outer ring of the dielectric layer, and the power supply layer is arranged on the outer ring of the radial isolation layer; and the lower surface of the central isolation layer of the piezoelectric unit is bonded with the upper surface of the combined upper electrode layer of the self-powered capacitor unit in a face-to-face manner, so that the piezoelectric unit and the self-powered capacitor unit form an integral structure. Dynamic and static load monitoring under the sole complex environment is achieved through the piezoelectric-capacitance multiple effects, power is supplied to the capacitor unit through the power supply layer, and the sensor has the advantages of being high in sensitivity, low in power consumption, good in durability and the like.

The invention discloses a vehicle exterior handle waterproof false triggering system and method based on double-frequency-point charging and discharging resonance, and relates to the technical field of automotive electronics. An electrode array composed of capacitance detection electrodes is arranged on the inner side of a vehicle exterior handle to form a vehicle exterior handle capacitance sensor; in a non-interference environment, high-frequency and low-frequency mutual capacitance reference values are collected, and a compensation parameter library is established by associating outer handle shell parameters of the vehicle; a self-capacitance channel of the electrode array is used for detecting proximity signals, high-frequency and low-frequency mutual capacitance signals are collected, and the high-frequency and low-frequency mutual capacitance signals are preprocessed; calling a compensation parameter library to correct the preprocessed high and low frequency mutual capacitance signal, and calculating the mutual capacitance increment and change slope of the high and low frequency mutual capacitance signal; based on the mutual capacitance increment and the change slope, human body touch and water interference are distinguished by analyzing high-frequency and low-frequency signals.

The invention relates to the technical field of mother and baby products, in particular to a breast pump and a differential capacitance sensor assembly. The breast pump comprises a milk storage container used for storing milk and a differential capacitive sensor assembly used for detecting state parameters of the milk storage container. The milk storage container comprises a milk storage container shell, and the milk storage container shell comprises an inner side face making contact with milk and an outer side face not making contact with the milk. The differential capacitance sensor assembly comprises a detection electrode assembly, and the detection electrode assembly is arranged on the outer side face or close to the outer side of the outer side face. The state parameters of the milk storage container are detected through the differential capacitance sensor assembly, external interference is not likely to happen, the detection accuracy of the state parameters of the milk storage container can be guaranteed, non-contact measurement is conducted on the milk storage container, and it is guaranteed that milk is clean.

A system may include a resistive-inductive-capacitive sensor, a driver configured to drive the resistive-inductive-capacitive sensor at a driving frequency, a measurement circuit communicatively coupled to the resistive-inductive-capacitive sensor and configured to measure phase information and amplitude associated with the resistive-inductive-capacitive sensor, and a noise detection circuit communicatively coupled to the measurement circuit and configured to determine a presence of external interference in the system based on at least one of the phase information and the amplitude information.

The invention relates to the technical field of intelligent robots, and discloses an automobile cabin intelligent robot arm device which comprises a multi-axis robot arm, a controller, an in-automobile space sensing device and an intelligent interaction device, and the multi-axis robot arm, the controller, the in-automobile space sensing device and the intelligent interaction device are all installed in an automobile cabin. The robot arm comprises a base rotating motor, an arm motor, a palm motor, a capacitance sensor, a pressure sensor, a USB / Type-C interface, a wireless charging interface, a magnetic attraction interface and the like. The in-vehicle space sensing device comprises a camera, a millimeter wave radar and the like. According to the intelligent robot arm device of the automobile cabin, the intelligent robot arm is controlled through voice or keys and the like, and the robot arm replaces personnel to complete object taking operation at a long distance or a view blind area position; distraction caused by the fact that a driver takes objects towards the back row can be avoided, and driving safety is improved. Meanwhile, the intelligent robot arm is controlled through voice or keys and the like, and the robot arm replaces personnel to complete service operations such as article storage, article fixing, games and caring; and the intelligent experience of the cabin is improved.

An aerosol supply device for receiving an article comprising a first section and a second section. The aerosol supply device includes: a receiving portion configured to receive at least a portion of an article; a capacitance sensor configured to measure a capacitance on a portion of the aerosol supply device receiving the article; and a processor communicatively coupled to the capacitive sensor, the processor configured to determine whether the article has been inserted or removed based on the capacitance measured over a period of time. During insertion and / or removal of the article: when the first segment is adjacent to the capacitive sensor, the capacitive sensor measures a first capacitance value; when the second segment is adjacent to the capacitive sensor, the capacitive sensor measures a second capacitance value, the second capacitance value being different from the first capacitance value, and the processor is configured to determine, using the first capacitance value and the second capacitance value, that the article has been inserted into or removed from the receiving portion.

The invention discloses a high-precision integrated temperature and humidity sensor and a construction method. The sensor comprises an MEMS humidity capacitance sensor, a CMOS integrated temperature sensor, an analog-to-digital converter, a calibration configuration information storage array and a digital interface. Wherein the MEMS humidity capacitance sensor and the CMOS integrated temperature sensor are respectively connected with the analog-to-digital converter, and voltage signals of the MEMS humidity capacitance sensor and the CMOS integrated temperature sensor are converted into digital signals; the analog-to-digital converter transmits the digital signal to the calibration configuration information storage array for data processing and linearization processing, and transmits the data to the SDAamp through a digital interface; in SCL; wherein the MEMS humidity capacitance sensor comprises a capacitance pole plate, a protection ring and a heating resistor; the capacitor plates adopt an interdigital capacitor structure and have a regular octagonal part in overlook observation, and meanwhile, the upper and lower electrode plates and the polyimide PI material layer between the two electrode plates form the interdigital capacitor structure.

The invention provides an MEMS (Micro Electro Mechanical System) micromirror array chip, a module and optical scanning equipment. The MEMS micromirror array chip comprises a plurality of micromirror structures, a substrate, a vertical lead structure and a capacitance angle sensing structure, according to the micro-mirror array chip integrated with the capacitive sensor, array-level real-time angle detection, feedback control and high-precision scanning angle detection are realized, and the micro-mirror array chip is fast in driving and resistant to interference; meanwhile, the wiring density is reduced by frequency division multiplexing isolation signals; in addition, the application of a monolithic integrated capacitance angle sensor in a high-density micro-mirror array chip is realized by a thick substrate with a silicon through hole; and finally, the micromirror array chip of the monolithic integrated capacitance angle sensor is used for precision optical scanning equipment, a photoelectric angle detector is omitted, optical scanning high-precision real-time angle detection and feedback control, high-precision angle detection and high-speed scanning are realized, the use design is convenient, and the cost is low.

The invention provides a graphene-based capacitive sensor for detecting the moisture content in lubricating oil, a preparation method of the graphene-based capacitive sensor and a method for detecting the moisture content in the lubricating oil, and belongs to the technical field of moisture content detection. The graphene-based capacitive sensor for detecting the moisture content in the lubricating oil comprises a graphene-based electrode and a gold nanoparticle layer which are arranged in a laminated manner, the graphene-based electrode comprises a laser-induced graphene film and doped nanoparticles loaded on the surface and in pores of the laser-induced graphene film, and the doped nanoparticles are silver nanoparticles and copper oxide particle clusters; array holes are formed in the gold nanoparticle layer, the diameter of holes in the array holes is larger than the diameter of water molecules and smaller than the diameter of lubricating oil molecules, and the depth of the holes in the array holes is consistent with the thickness of the gold nanoparticle layer. The graphene-based capacitive sensor can realize real-time online detection of the moisture content in the lubricating oil, and is high in detection sensitivity and simple to operate.

A system for determining a fly height includes a first head of a disk drive, a second head of the disk drive, a capacitive sensor circuit coupled to the first head and the second head, and a logic device coupled to the capacitive sensor circuit. The capacitive sensor circuit is configured to measure a first capacitance between the first head and the first disk, remove noise from the first capacitance using a second capacitance between the second head and the second disk, and based thereon determine a corrected first capacitance. The logic device is configured to determine the fly height between the first head and the first disk using the corrected first capacitance.

The invention discloses a method for calculating blade tip clearance and vibration of a turbomachine blade based on continuous Gaussian fitting, and belongs to the technical field of fault diagnosis. A continuous Gaussian fitting (CGF) method is proposed to be used for obtaining a data signal which can be used for more accurately calculating a blade tip gap and a blade tip vibration characteristic. Compared with a conventional threshold value recognition method (TVM), the CGF method has the advantages that Gaussian fitting calibration is performed on blade tip state signals collected by the capacitive sensor, interference of environmental noise is greatly reduced, and the accuracy of blade tip clearance and vibration calculation is remarkably improved. Experimental results show that the CGF method shows better calculation stability under different rotating speed working conditions, especially at a low rotating speed, the calculation stability of blade tip vibration is 4.15 times that of a TVM method, and blade resonance can be recognized more accurately. According to the method, real-time monitoring can be realized, and more accurate blade tip clearance and vibration data can be provided.

The invention discloses a wafer carrier size laser measurement device, and relates to the technical field of laser measurement, the wafer carrier size laser measurement device comprises a measurement platform mechanism, the measurement platform mechanism comprises a mounting table, the front surface of the mounting table is provided with a control terminal, and the top of the inner cavity of the mounting table is fixedly connected with a mounting rack; and the surface of the mounting frame is fixedly connected with a first motor. According to the invention, through the arrangement of the horizontally distributed self-adaptive nodes, flexible deployment is realized by utilizing a magnetic attraction structure, and the electric telescopic rod and the silica gel contact head are matched, so that complex curved surfaces such as a three-dimensional buckle and a deep groove of a carrier can be attached in a self-adaptive manner; a vertical plane and a concave structure which are difficult to detect by a traditional device can be subjected to multi-angle scanning, a measurement blind area is thoroughly eliminated, the coverage rate of three-dimensional size detection is remarkably increased, meanwhile, a temperature and vibration compensation model is built in an intelligent compensation algorithm module integrated by a control terminal, and the influence of environmental factors on a measurement result is corrected in real time.

The invention discloses a high-sensitivity proximity sense and three-dimensional pressure sense flexible capacitive sensor. The capacitive sensor comprises a plurality of sensing units which are distributed in an array mode, and each sensing unit comprises a contact layer, a hierarchical porous composite sensitive conductive unit and an induction electrode unit which are sequentially arranged in a stacked mode. Dual-mode measurement of proximity sense and three-dimensional pressure sense is achieved through a single-sensing-body mechanism, when a measured object is not contacted, the sensing unit completely works in a dielectric state, proximity sense measurement can be achieved, after the measured object is contacted, the sensing unit works in a common electrode state, three-dimensional pressure sense measurement can be achieved, and the sensing unit can be used for measuring the proximity sense and the three-dimensional pressure sense. Compared with a traditional flexible dielectric material, the hierarchical porous composite material is used as the sensitive unit, so that the dielectric constant and the deformation capability of the sensitive unit are greatly improved, and high sensitivity of flexible proximity sense and three-dimensional pressure sense measurement is ensured.

The utility model discloses a response bandwidth measuring device of a capacitive tip clearance measuring system based on an analog switch, the capacitive tip clearance measuring system is composed of a capacitive sensor, a measuring system host and an upper computer which are connected in sequence, and the measuring system host comprises a signal demodulation module and an acquisition module. The capacitive sensor consists of a sensor probe and a three-coaxial cable which are connected with each other; the response bandwidth measuring device replaces the sensor probe and is connected with the tri-coaxial cable through an SMA connector, and the response bandwidth measuring device adopts an analog switch to simulate capacitance change caused by the fact that the tip of the rotating blade sweeps the sensor probe and simulate input of the capacitive tip clearance measuring system; the response bandwidth measuring device is composed of an analog switch, a first capacitor C1 and a second capacitor C2, the analog switch is connected with the first capacitor C1 in series after being connected with the second capacitor C2 in parallel, and the analog switch is simplified into a single-pole double-throw switch S and an equivalent capacitor Cs (off).

The invention belongs to the technical field of flexible pressure sensors, and particularly relates to an ionizing fabric-based pressure-volume sensor and a preparation method thereof. The pressure-volume sensor is composed of an upper electrode layer, a lower electrode layer and a dielectric layer, a flexible diaphragm layer is arranged between the electrode layers and the dielectric layer, and holes with certain density are formed in the flexible diaphragm layer. The ionizing fabric-based pressure-capacitance sensor is simple in structure and simple in preparation process, and meanwhile, accurate regulation and control and wide-range linear response of the ionizing contact area between the capacitance sensor electrode and the dielectric layer can be realized.

The utility model discloses a touch detection device, a touch response device, a steering wheel and an automobile, a capacitive sensor is arranged on the surface of a key body, a plurality of pressure sensors are uniformly distributed in the key body, and a touch detection circuit outputs touch sensing signals according to detection signals of the capacitive sensor and the pressure sensors. Only when the capacitive sensor and the pressure sensor detect signals at the same time, the touch detection circuit outputs the touch sensing signal, so that misrecognition of the touch signal is avoided, the touch detection device is simple in structure and low in production cost, the stability and reliability of key touch can be effectively improved, and meanwhile the response rate of the key is not affected.

A capacitance measurement circuit includes a charge to voltage converter (CVC) that includes at least one first variable capacitor, an excitation signal generation circuit, a differential amplifier, a first switch circuit, and at least one second variable capacitor, wherein a parasitic capacitance from a sensing capacitance sensed by a capacitance sensor is reduced by the at least one first variable capacitor. The excitation signal generation circuit is arranged to generate and connect a first excitation signal to the capacitance sensor, and generate and connect a second excitation signal to the at least one first variable capacitor, wherein the first excitation signal and the second excitation signal are out-of-phase, and a voltage amplitude of the first excitation signal is different from a voltage amplitude of the second excitation signal. The inverting input terminal of the differential amplifier is arranged to receive the sensing capacitance from the capacitance sensor.

A system including a plurality of first wires and a plurality of second wires is disclosed. Each second wire overlaps over one or more first wires at a respective overlapping area of one or more first wires. A dielectric material is disposed in a vertical gap at each respective overlapping area forming a capacitance sensor including a first electrode corresponding to a first wire and a second electrode corresponding to a second wire. The first and second electrodes are connected to a positive bias and a negative bias of at least one voltage source, respectively. The system includes at least one processor configured to periodically measure change in respective electric field of each capacitance sensor of a subset of capacitance sensors of a plurality of capacitance sensors, and store data corresponding to periodically measured change in the respective electric field of each capacitance sensor of the subset of capacitance sensors.

The invention discloses a multi-step capacitive sensor reading circuit and an implementation method thereof. An incremental zoom capacitive sensor reading circuit is improved. A sampling method for improving chopping is designed, extra hardware overhead is not introduced, the working time sequence of the CDC is fully utilized, sampling noise and offset and flicker noise of a first-stage integrator are eliminated together, and the problems that power consumption is increased, measurement time is prolonged and the like existing in common methods of multiple sampling averaging and sampling noise elimination technologies are solved. A self-biased floating inverting amplifier is prepared, and the self-biased floating inverting amplifier is used as a first-stage integrator, so that the energy efficiency of the system is improved, and the use of a common-mode feedback circuit is also avoided. The method realizes high energy efficiency, high precision and low delay, and can be widely applied to the fields of robots, unmanned aerial vehicles and the like.

The present disclosure relates to a seat element comprising a padding and a cover arranged around the padding, the seat element comprising two longitudinal side edges, a first side of the seat element being located on one side of a longitudinal central plane, a second side being located on the other side of the longitudinal central plane, the seat element comprising a first coplanar interdigital electrode capacitive sensor arranged on the first side and a second coplanar interdigital electrode capacitive sensor arranged on the second side, the second capacitive sensor being distant from the first capacitive sensor in a longitudinal direction by a first distance of between 30 millimeters and 50 millimeters.

The invention, which relates to the technical field of capacitor fault diagnosis, discloses a capacitor fault prediction and diagnosis system based on loss data, comprising a data acquisition module, an analysis module, a diagnosis module and a decision module. The data acquisition module is responsible for acquiring capacitance parameter data of a capacitor, collecting internal parameters of the capacitor through a capacitance sensor array, and transmitting the capacitance parameter data to the data preprocessing module; the data preprocessing module is used for further preprocessing the capacitance parameter data transmitted from the data acquisition module; according to the method, the percentage loss proportion and the residual service life RUL of the capacitor are calculated through the analysis unit based on the screened optimization characteristic data, different strategies are further executed in a graded mode, the loss trend of the capacitor is effectively calculated by analyzing the internal parameters C, ESR and tan delta of the capacitor, potential faults are recognized in advance, and the fault diagnosis accuracy is improved. Therefore, the accuracy of capacitor fault prediction is improved, and long-term stable operation of equipment is guaranteed.

An example of a digital artery blood pressure monitor may include a tactile sensor array disposed on an inner surface of a cuff, the tactile sensor array including a plurality of capacitive sensors to detect pressure changes within a digital artery of a finger due to blood flow, where the pressure changes cause changes to capacitance values of one or more capacitive sensors of the tactile sensor array, and control circuitry coupled to the tactile sensor array to receive the capacitance values from the tactile sensor array, and determine a blood pressure based on the capacitance values.

The invention discloses a spatial two-dimensional linear displacement measurement method based on a planar differential four-quadrant capacitor, and the method comprises the steps: firstly fixing a drive module on a device which needs to measure the two-dimensional linear displacement of a moving part, then connecting a detection capacitor with the moving part, and constructing a differential four-quadrant capacitance sensor; when the detection capacitor carries out planar two-dimensional linear displacement along with a moving part in the equipment, differential output capacitance between a first quadrant and a third quadrant and differential output capacitance between a second quadrant and a fourth quadrant are obtained, and a differential output displacement matrix is constructed; four paths of dual-frequency aliasing excitation signals are constructed to construct a decoupling matrix, driving capacitors in four quadrants are respectively excited through the four paths of excitation signals to realize decoupling, and then current signals output by detection capacitors are acquired; and the current signal is demodulated by using a synchronous demodulation technology to obtain two paths of components of the current signal, and the quadrant of the detection capacitor moving along with the moving part and the corresponding displacement can be determined based on the two paths of components.

The utility model provides a multifunctional composite sensor device for food safety detection. The multifunctional composite sensor device comprises an open-end coaxial sensor, an electrochemical sensor / interdigital capacitance sensor and a temperature sensor which are compounded in a protective shell, wherein the open-end coaxial sensor is used for testing the dielectric constant of a substance, and is particularly used for detecting the main components, salinity, sugar degree and maturity of the substance and the microstructure and texture of a to-be-tested substance; the electrochemical sensor is used for detecting the freshness of substances, the proportion of main components, toxic and harmful trace elements or trace compounds, toxic and harmful bacteria and the like; the temperature sensor is used for detecting the actual temperature and the temperature change condition of the detected substance; the composite sensor device disclosed by the utility model has full-band multi-dimensional substance detection capability, and can be used for real-time detection and evaluation of food safety and food quality.

A capacitance measuring circuit includes a charge-to-voltage converter including at least one first variable capacitor, an excitation signal generating circuit, a differential circuit, a first switching circuit, and at least one second variable capacitor. Wherein a parasitic capacitance value in a sensing capacitance value sensed by a capacitance sensor is reduced by at least one first variable capacitance. The excitation signal generating circuit is used for generating and connecting a first excitation signal to the capacitive sensor and generating and connecting a second excitation signal to the at least one first variable capacitor, the first excitation signal and the second excitation signal are opposite in phase, and the voltage amplitude of the first excitation signal is different from that of the second excitation signal. The inverted input end of the differential amplifier is used for receiving a sensing capacitance value from the capacitance sensor.

The present disclosure relates to a seat backrest, the backrest extending in a longitudinal direction and a transverse direction, the backrest comprising: at least one first and one second coplanar interdigital electrode capacitive sensor arranged on a first zone of the backrest located above a horizontal central plane and on one side of a vertical central plane; the second capacitive sensor of the first zone being located above the first capacitive sensor of the first zone; the second capacitive sensor of the first zone being advanced by a first distance relative to the first capacitive sensor of the first zone in the direction of the central vertical plane.

The invention provides an edge searching method and device for laser cutting, electronic equipment and a storage medium, and the method comprises the steps that an edge searching starting point and an edge searching track are obtained, a point laser sensor is controlled to move to the edge searching starting point and move according to the edge searching track, and in the moving process of the point laser sensor, edge searching height data of the point laser sensor are obtained; determining N edge point positions according to the edge searching height data, wherein N is greater than or equal to 3; a plate vertex and an edge searching angle are determined according to the edge point position, a machining graph is corrected according to the plate vertex and the edge searching angle, a laser cutter is controlled to machine the plate according to machining parameters, and the determination speed of determining the plate vertex and the edge searching angle according to the edge point position is increased; since the point laser sensor does not need to follow the nozzle of the laser cutter to the plate surface, and the data stability of the point laser sensor is higher than that of a capacitance sensor when the point laser sensor is interfered by external factors, the determination speed and accuracy of the edge point position can be improved, and the edge searching accuracy and efficiency are further improved.

The embodiment of the invention belongs to the household appliance technology, and provides a clothes dryer and a drying control method thereof, and the clothes dryer comprises a box body, a barrel body, a motor, a compressor, a fan, a resistance sensor, a capacitance sensor and a processor; the processor is configured to execute a first drying task, and the first drying task is configured to control the compressor to operate at a first frequency, the fan to operate and the motor to operate; when executing the first drying task, the processor is further configured to control the running duration of the first drying task; when the humidity value is smaller than the first threshold value and the air moisture content is smaller than a second threshold value, a second drying task is executed; the second drying task is configured to control the compressor to operate at a second frequency, the fan to operate and the motor to operate continuously; and when the processor executes the second drying task, the processor is further configured to control the running duration of executing the second drying task. The method and the device can improve the clothes dryness judgment precision, improve the clothes drying quality and reduce the drying energy loss.