203 results about "Contact impedance" patented technology

The invention relates to a probe contact impedance real-time monitoring and compensating method and device and a storage medium. The method comprises the following steps: acquiring a first measurement data set containing a probe contact resistance value and a contact force, and inputting the first measurement data set into a double-layer deep learning neural network for training to obtain a probe contact resistance monitoring model; performing two-parameter fault detection to obtain a contact state classification result; generating a two-dimensional compensation matrix based on a contact state classification result, and performing nonlinear mapping calculation on the second measurement data set to obtain a compensation coefficient; the compensation coefficient, the original probe structure parameters and the original probe operation parameters are input into a graph attention stacking auto-encoder for parameter prediction, and target probe structure parameters and target probe operation parameters are obtained; cloud model calculation and weighting operation are carried out, a target compensation instruction is obtained, and the target compensation instruction is used for adjusting the probe position parameters and the probe pressure parameters. According to the invention, the probe testing precision of the chip is improved.

The invention provides a semiconductor chip automatic test optimization system, and belongs to the technical field of electrical variable measurement. Comprising an acquisition module used for establishing an electrical variable time sequence arranged according to a time sequence, a drift analysis module used for calculating a short-time fluctuation amplitude value, a long-term drift slope and a high-frequency noise amplitude value based on the impedance time sequence arranged according to the time sequence, and a contact judgment module. The evaluation module is used for constructing a contact impedance coefficient based on a short-time fluctuation amplitude value, a long-term drift slope and a high-frequency noise amplitude value in a jth sliding window, and evaluating and optimizing the contact impedance coefficient, and the data marking module is used for marking electrical variable measurement data corresponding to a test channel which is evaluated to be instable in contact as low confidence. According to the system, the ith test channel of the temperature sensor chip can be tested more accurately, the short-time fluctuation amplitude value, the long-term drift slope and the high-frequency noise amplitude value are calculated at the same time, multi-source data participates, and the test accuracy is improved.

The invention discloses an electrode adaptive control system based on multi-modal signal driving, which is applied to multi-electrode adaptive design in a helmet-type electrode cap voltage acquisition system, and integrates a high-precision data acquisition module, a first contact quality evaluation coefficient generation module, a second contact quality evaluation coefficient generation module, a fusion decision module, an adaptive control module and a database. Self-adjustment of the electrodes in real time and electroencephalogram feedback data acquisition of the electrodes are realized. According to automatic adjustment of the electrode, the signal acquisition stability and the wearing comfort of the electrode are optimized by detecting the contact impedance coefficient of the electrode and the scalp, the electrode pressure gradient coefficient and the like, and a personalized electrode adjustment strategy is formulated.

The invention belongs to the technical field of fault early warning, and discloses a heater fault early warning method and system based on current analysis. Comprising the steps that transient current signals of all heating wire loops in the copper bush heater are collected in real time, harmonic characteristic parameters are extracted, and a dynamic current fingerprint database and a multi-dimensional harmonic characteristic spectrum are generated respectively; dynamically calculating the contact impedance between each heating wire and the copper sleeve groove according to the dynamic current fingerprint database and the multi-dimensional harmonic characteristic spectrum; the current distribution path of each heating wire in the copper sleeve groove is restored in real time, the abnormal contact form of each heating wire is identified, the falling risk probability and falling risk strength of each heating wire are dynamically predicted by fusing the falling precursor signals of each heating wire detected in real time, and a grading early warning strategy report is generated in real time; according to the invention, fault early warning can be converted into preventive maintenance from post-maintenance, the intelligent level of operation and maintenance of the heater is improved, and the continuity and safety of production are guaranteed.

The invention relates to the technical field of connector detection, and discloses a reliability detection method based on a connector. The method comprises the following steps: acquiring real-time monitoring data of a multi-channel electrical sensor of a connector in a power-on state, wherein the real-time monitoring data covers a contact impedance fluctuation sequence, temperature rise gradient distribution and an electromagnetic leakage intensity spectrum; performing time-frequency domain fusion processing on the monitoring data, and extracting dynamic characteristic parameter sets such as impedance attenuation rate, heat conduction lag coefficient and field intensity distortion factor of each contact point; then, according to the parameter space distribution difference, a three-dimensional degradation model comprising a material performance attenuation layer, a contact surface deformation topology layer and an insulating medium loss layer is constructed; coupling mechanical stress and electric heating field intensity distribution based on the model, and generating life prediction indexes of each region; and finally, completing reliability grading according to the indexes, and outputting a detection report with key failure position marks. According to the method, comprehensive and accurate evaluation of the reliability of the connector is realized, and an effective technical path is provided for quality control of the connector.

The invention discloses a microwave and radio frequency integrated treatment system which comprises a multi-source information acquisition module, a feature extraction module, a feature modeling module and an instruction generation module. The multi-source information acquisition module acquires internal temperature distribution data and contact impedance spectroscopy data of a focus through a sensor array, and forms focus materialization data in combination with focus space information; the feature extraction module performs space-time registration on the focus materialization data by using a space-time registration algorithm to obtain focus comprehensive thermal impedance features; the feature modeling module extracts space-time evolution features of the comprehensive thermal impedance features of the focus by using a lightweight convolutional neural network, and constructs a thermal impedance dynamic expansion model; the instruction generation module generates an initial control instruction sequence used for controlling the microwave and radio frequency integrated treatment equipment based on the thermal impedance dynamic expansion model in combination with the treatment scheme.

The invention belongs to the field of signal quality analysis, particularly relates to quality analysis of non-invasive brain impedance measurement signals of a human body, and particularly discloses a method for judging signal quality in real time in brain impedance measurement. Then, in the brain wave signal acquisition process, a voltage electrode is used for recording a brain wave signal, and meanwhile, the contact impedance and contact movement information between a current electrode and the scalp are obtained through an impedance monitoring device and a displacement sensor; therefore, the measurement parameter range of the contact impedance is expanded, on the basis, the collected contact impedance and contact movement data are analyzed, more comprehensive data support can be provided for identification of brain wave signal quality abnormity, and then the accuracy and reliability of abnormity classification are improved.

The invention relates to the technical field of circuit board detection, and provides a circuit board damage detection optimization method and system, and the method comprises the following steps: S1, synchronously collecting a contact resistance signal, a probe pressure signal and environment data of a circuit board test point through a probe array, and carrying out the optimization processing of the collected data parameters; s2, establishing a contact impedance dynamic model, depicting the dynamic change of the contact impedance of the circuit board, extracting a characteristic signal for analysis, and mining the mode characteristics of an abnormal signal; and S3, fusing the abnormal multi-source evidences of the circuit board, processing the uncertainty and relevance among the evidences, and reversely deducing the positions and reasons of the potential defects on the circuit board. Through a multi-dimensional verification and error self-correction mechanism, the error between a defect solution and a real defect is quantified and reversely deduced by using posterior error estimation, so that the reliability and consistency of a detection result are improved, a reliable result support is provided for engineering application of circuit board damage detection, and meanwhile, the dependence on detection experience of detection personnel is avoided.

The invention discloses a connector contact impedance automatic detection device and method, and is applied to the technical field of connector contact impedance detection.The connector contact impedance automatic detection device comprises a base, a driving box, a detection frame, a detection mechanism, an operation assembly, a temperature control box and a connector, the driving box and the detection frame are fixed to the top of the base, and the detection frame is arranged on one side of the driving box; the detection mechanism and the operation assembly are arranged on the side portion, close to the detection frame, of the driving box, the detection mechanism corresponds to the detection frame in position, the temperature control box is arranged in the driving box, the temperature control box corresponds to the detection frame in position, and the connector comprises a shell and a plurality of contact pieces arranged in the shell. The detection mechanism comprises a driving air cylinder, a detection head and a camera, the camera is electrically connected with a visual module, and the visual module is used for identifying the shape and the position of a contact piece of the connector, the detection steps can be simplified, and the detection efficiency can be improved.

The embodiment of the invention provides a temperature drift compensation device, method and equipment for contact impedance of a high-frequency probe card. The system is applied to the technical field of semiconductor testing and comprises a temperature monitoring module, an impedance modeling module, a compensation execution module and a cooperative control module which are connected in sequence. In this way, the technical problems that in the prior art, temperature drift compensation is slow in response and insufficient in precision are solved through the sub-millisecond-level temperature monitoring network, the nonlinear compensation model and multi-probe cooperative compensation in combination with the self-adaptive Kalman filtering algorithm.

The invention discloses a current sensor pin bending processing control system and processing equipment, and relates to the technical field of current sensor pin bending processing, and the current sensor pin bending processing control system comprises the following steps: fusing and collecting three types of disturbance parameters with different physical dimensions and response mechanisms, namely bending acceleration ZWa, pin surface contact impedance disturbance ZBd and friction sound spectrum response ZMc; the sensing coverage range of the system on the multi-source abnormal phenomenon in the machining process is remarkably expanded, the recognition blind area of a traditional system depending on a single force or displacement signal is made up, and the sensitivity to non-dominant disturbance characteristics is improved. Non-linear interaction modeling is carried out on the three disturbance factors through the perturbation coupling strength index psi, and the system not only can recognize single-variable fluctuation, but also can capture the co-evolution trend among variables. According to the structure, the system has the capability of recognizing disturbance structural imbalance and coupling activation trend in advance, and has higher fault perspectiveness and active response capability.

The invention discloses a flexible electrocardio acquisition integrated array and a preparation method, and the flexible electrocardio acquisition integrated array comprises a flexible substrate which is formed based on an organic polymer solution; one part of the conductive layer uniformly covers the surface of the flexible substrate, and the other part of the conductive layer is embedded into the flexible substrate; the conductive layer is formed by mixing a two-dimensional layered conductive material and a one-dimensional linear conductive material; the conductive layer comprises a plurality of lead channels for lead electrocardiogram acquisition; wherein each lead channel comprises a round probe, a connecting line and a bonding pad, and the round probe is connected with the bonding pad through the connecting line. The flexible electrocardio acquisition integrated array provided by the invention has flexibility, high conductivity, stretchability and high stability at the same time, and has relatively low contact impedance, so that the quality of acquired electrocardio signals is improved while the wearing comfort of the electrocardio electrodes is improved.

The invention discloses a forehead flexible sensing method and system, and relates to the technical field of flexible sensing, and the method comprises the following steps: S1, obtaining microenvironment sensing data; s2, generating an original data frame; s3, performing invalid frame inducement classification on the original data frames; s4, distinguishing valid frames from invalid frames; s5, performing directional remining and parameter correction of remining-mining linkage on the judged invalid frames; and S6, dynamically adjusting the regulation and control parameters. According to the invention, through multi-dimensional microenvironment perception grading, invalid frame inducement classification and discrimination and threshold value weighting dynamic linkage fine tuning, in combination with a steaming-sampling linkage directional resampling mode, microenvironment dynamic change characteristics such as conductivity, temperature, contact impedance and the like caused by skin sweat secretion, environment temperature and humidity conduction and head actions in a wearing process can be captured; and adaptive acquisition parameters are dynamically matched according to an actual grading result of the microenvironment, so that the problem of gradual distortion of core physiological signals such as electroencephalogram and PPG caused by microenvironment change is avoided.

The invention relates to the technical field of cables, in particular to a cable joint connection fault detection device which comprises a detection mechanism, the detection mechanism comprises a detection box, the two sides of the top of the inner wall of the detection box are fixedly connected with downward pressing positioning assemblies, and the two sides of the bottom of the inner wall of the detection box are fixedly connected with supporting plates. A contact impedance tester is arranged on the front side of the top in the detection box, mounting boxes are arranged on the two sides of the bottom of the detection box, and cooling fans are fixedly mounted in the mounting boxes; the lifting and attaching mechanism comprises a lifting hydraulic cylinder, the lifting hydraulic cylinder is fixedly connected to the top of the detection box, the output end of the lifting hydraulic cylinder penetrates through the bottom of the detection box, and the contact impedance tester can be attached to cable joints of different sizes through an attaching assembly in the lifting and attaching mechanism. And the rotary cleaning mechanism can clean the surface of the joint needing to be detected in the lifting process of the lifting plate.

This application provides a bioelectrical impedance measurement method, circuit, chip, and electronic device. The method includes: obtaining a first contact impedance value corresponding to a first excitation electrode and a second contact impedance value corresponding to a second excitation electrode through a preset method; determining the transmission direction of an excitation current between the first and second excitation electrodes based on the first and second contact impedance values; controlling the excitation current to transmit between the first and second excitation electrodes according to the transmission direction; determining a target voltage value between a first and second measuring electrode, and calculating the impedance of the measured object based on the target voltage value; wherein the first and second contact impedance values ​​are different. This application can reduce the influence of contact impedance on the bioelectrical impedance measurement results, reduce the measurement error of bioelectrical impedance, and improve the accuracy of bioelectrical impedance measurement.

A signal measurement device (100), comprising: an electrode (110) fitted to a human body for collecting an electromyographic signal of the human body within a target frequency range; the alternating current excitation source (120) is electrically connected with the electrode (110) and is used for providing an excitation signal of a first frequency so as to generate a detection signal reflecting the contact impedance between the electrode (110) and the human body; and a gain circuit (130) for providing gain for the electromyographic signal and the detection signal. The signal measuring device (100) provides gain for the acquired electromyographic signal and detection signal by providing the gain circuit (130), thereby improving the strength and quality of the electromyographic signal and detection signal, so that the signal measuring device (100) can accurately perform monitoring.

The invention discloses a method, a battery and a device for testing the gas production rate of a lithium ion battery, and the method comprises the following steps: carrying out an EIS test on the lithium ion battery to obtain an EIS test result; analyzing an EIS test result by using relaxation time analysis, and determining the relaxation time center point frequency of the contact impedance; performing single-frequency impedance scanning in the charging process of the battery cell; the frequency adopts relaxation time center point frequency; comparing the contact impedance reduction rates of the first battery cell and the second battery cell, and determining the gas production rates in the first battery cell and the second battery cell; and the internal reserved spaces of the first battery cell and the second battery cell are the same. And the gas production rate test of the battery cell is completed under a nondestructive condition, so that the performance and the safety of the battery are improved, and the cost is reduced at the same time.

The embodiments of the present disclosure disclose a signal measurement circuit and method. The signal measurement circuit include: a plurality of electrodes configured to be attached to a human body and collect physiological signals of the human body; a contact impedance detection circuit electrically connected with the plurality of electrodes, the contact impedance detection circuit being configured to measure a contact impedance between each of the plurality of electrodes and the human body; and a switching circuit configured to control a conduction state between the plurality of electrodes and the contact impedance detection circuit, such that only a portion of the plurality of electrodes are in the conduction state with the contact impedance detection circuit simultaneously.

The invention relates to the technical field of connector detection, in particular to an automobile connector contact impedance detection method and system. The method comprises the following steps: acquiring a plugging operation signal and charging current data of the automobile connector in a charging process; acquiring sampling data of all sensors connected with the automobile connector by using a stable delay acquisition unit based on the plugging operation signal; comparing each sampling data with a preset historical reference value to obtain each drift sampling comparison value; based on the charging current data, each drift sampling comparison value and a sampling drift threshold value corresponding to each drift sampling comparison value, obtaining a measurement reference value after calibration of each sensor; and detecting the contact impedance of the automobile connector based on each measurement reference value to obtain a detection result of the contact impedance. The objective of the invention is to solve the problems in the prior art that measurement errors and real degradation signals cannot be accurately distinguished, and charging safety of an electric vehicle and reliable operation of a connector are difficult to guarantee.

The invention relates to the technical field of adapters, and discloses an electric connection structure. The electric connection structure comprises a pin and an elastic sheet. The elastic sheet is connected with at least two abutting parts. The at least two abutting parts abut against and are electrically connected with different areas of the pins respectively. Therefore, at least two contact points can be arranged between the pin and the elastic sheet, so that the contact area is increased, the contact impedance is reduced, and the output power is improved. Meanwhile, based on the redundant arrangement of the contact points, when the electrical connection at one contact point is disconnected, the other contact points can ensure the reliable electrical connection between the pin and the elastic sheet, and the fault-tolerant capability of the electrical connection between the pin and the elastic sheet can be improved.

Disclosed is a signal measuring device including: at least one electrode configured to contact with a human body to collect an electromyographic (EMG) signal of the human body in a target frequency range; an alternating current (AC) excitation source electrically connected to the at least one electrode, the AC excitation source being configured to provide an excitation signal at a first frequency to generate a detection signal reflecting a contact impedance between the at least one electrode and the human body; and a gain circuit configured to provide a gain for the EMG signal and the detection signal. In the present disclosure, by providing the gain circuit, gains are provided for the EMG signal and the detection signal collected so as to improve strengths and qualities of the EMG signal and the detection signal, and enable an accurate monitoring of the signal measuring device.

The invention relates to the technical field of measuring devices, and provides a clamp and a measuring system.The clamp comprises a first insulating part, a second insulating part and a measuring assembly, the first insulating part is provided with a first abutting part and a protection cavity channel penetrating through the first abutting part, the second insulating part is hinged to the first insulating part, the second insulating part is provided with a second abutting part, and the first abutting part is hinged to the second abutting part; the first abutting part and the second abutting part face each other in the second direction, the cavity opening of the protection cavity and the second insulating part are arranged in a spaced mode in the second direction, the measuring assembly is arranged on the first insulating part and comprises a conductive part, the conductive part is movably arranged in the protection cavity in a penetrating mode, and the conductive part is switched between a detection state and a storage state. According to the invention, the problems of large measurement result fluctuation and large measurement error when the contact impedance of the switch cabinet is measured can be solved.

The application discloses a kind of hydrogel electrode with adhesion and anti-sweat characteristics and preparation method and application thereof, belong to flexible hydrogel sensing material technical field.The electrode is formed by dissolving acrylic acid, hydrophobic modified tannic acid, initiator, polyethyleneimine and conductive substance in deionized water to form a precursor solution, and is prepared by pouring into mould and then carrying out ultraviolet light polymerization.The hydrogel electrode prepared by the application has good mechanical strength, excellent skin adhesion, significant anti-sweat interference ability, high conductivity and low contact impedance.The electrode can be directly attached to the skin and used as a strain sensor or to collect various bioelectric signals, and has the comprehensive advantages of high stability, good detection accuracy, low interface impedance, excellent biocompatibility, easy-to-obtain material and simple process.

The application discloses an electrooculogram signal collection and analysis system and method, relates to the technical field of bioelectric signal collection, and comprises a data processing system, a CPU central processing circuit, a medium-frequency signal generation circuit, an output circuit, a signal collection system and an electrooculogram wave analysis system. The CPU central processing circuit is sequentially connected with the medium-frequency signal generation circuit and the output circuit. The output circuit is adapted to a target to be measured through the signal collection system. The signal collection system transmits collected signals to the electrooculogram wave analysis system, and feeds back the pretreated signals to the CPU central processing circuit. The CPU central processing circuit is in data intercommunication with the data processing system, and closed-loop feedback is performed through the data processing system. The application reduces the contact impedance of the flexible electrode, improves the motion artifact suppression capability, improves the prescription optimization efficiency, and improves the treatment efficiency through clinical verification.

The application provides a high-frequency surgical system. The system comprises: a power module, which forms a surgical circuit with a surgical electrode, a medical object and a double-plate neutral electrode, and is used for generating high-frequency current flowing in the surgical circuit to deliver energy to the surgical electrode; a parallel resonant circuit, which is coupled to one electrode of the double-plate neutral electrode at two ends; an excitation signal source, which is used for providing an excitation signal to the parallel resonant circuit to generate a measurement voltage at two ends of the parallel resonant circuit for determining contact impedance between the double-plate neutral electrode and the medical object, wherein the frequency of the excitation signal matches the resonant frequency of the parallel resonant circuit; and a control module, which is used for adjusting the energy delivered by the power module to the surgical electrode according to the measurement voltage, wherein the double-plate neutral electrode, the parallel resonant circuit and the excitation signal source are in the same electrically isolated area. According to the application, the impedance detection circuit is modularized, which is beneficial to design simplification and subsequent maintenance replacement.

The present application belongs to the technical field of radio frequency skin anti-aging device, and discloses a real-time impedance compensation low-interference skin anti-aging monopolar radio frequency device, which comprises a radio frequency host, a treatment hand tool and a neutral electrode. A plurality of partitioned electrodes insulated from each other are arranged on the periphery of the main treatment electrode of the treatment hand tool, and the neutral electrode is provided with a plurality of reflux partitions insulated from each other. During the treatment pulse output period, the partitioned electrodes are connected to the protection drive unit; during the adjacent pulse interval, the partitioned electrodes are first disconnected from the protection drive unit, connected to the local detection unit after limiting and discharging through the protection discharge branch, so as to obtain the local interface impedance of each partition and the contact impedance of the reflux partition. The main loop sampling unit obtains the total equivalent impedance of the monopolar radio frequency loop. The compensation control unit determines the compensation requirement of the subsequent treatment pulse according to the total equivalent impedance, and controls the compensation execution in combination with the contact state of the treatment end and the reflux end, so as to limit or stop the radio frequency output when the contact is abnormal, and realize the time-sharing multiplexing of the protection and detection.

The invention discloses a hydrogel-based non-invasive brain-computer interface electrode with non-uniform hardness and a preparation method of the hydrogel-based non-invasive brain-computer interface electrode, relates to the technical field of flexible electronic materials and devices, and can be used for data acquisition of electroencephalogram equipment and other flexible contact media for acquiring human electrophysiological signals, such as electromyographic signals, electrocardiosignals and the like. The cross-linking times mismatching strategy is adopted, different moduli at the two ends of the hydrogel electrode are achieved, the polyvinyl alcohol solution and the sodium alginate solution are directly mixed, freezing and thawing cycles of different times are carried out, and the electrode stability and wearing comfort are greatly improved. The hydrogel reduces the contact impedance through ionic conduction, and the impedance is lower than that of a commercial electrode. The hydrogel prepared on the basis of the method can be better prevented from slipping in an electrode clamp of an electroencephalogram cap, and meanwhile more comfortable and more stable contact is provided on an interface making contact with the skin. The process provides a better scheme for a series of human electrophysiological signal acquisition systems such as electroencephalogram signals and the like, and is of great significance to promotion of commercialization of non-invasive brain-computer interfaces.

The present invention provides a semiconductor device, an electrical contact structure and a manufacturing method thereof. By connecting the tops of at least two contact plugs formed at the boundary of the core component area, a combined contact structure with a larger top cross-sectional area is formed at the boundary of the core component area. Therefore, sufficient process margin is provided for the subsequent process of forming an electrical structure above the contact structure at the boundary of the core component area, so that the size of the electrical structure at the boundary is increased, the contact impedance is reduced, and the density difference of the circuit pattern between the core component area and the peripheral circuit area is buffered by the electrical structure with an increased size at the boundary, the optical proximity effect is improved, the consistency of the electrical structure above the contact plug within the boundary of the core component area is ensured, and the electrical structure above the contact plug at the boundary is prevented from collapsing, thereby improving device performance.

The embodiment of the invention provides a method, equipment and system for measuring the loop contact impedance of a switch cabinet and a storage medium, and the method comprises the steps: enabling a vector network analyzer to measure a first scattering parameter when a lead load end is short-circuited, and enabling the vector network analyzer to measure a second scattering parameter when the lead load end is connected with a reference resistor, and when the lead load end is connected with the switch cabinet, the vector network analyzer measures a third scattering parameter, the vector network analyzer sends the first scattering parameter, the second scattering parameter and the third scattering parameter to the electronic equipment, and the electronic equipment sends the first scattering parameter, the second scattering parameter and the third scattering parameter to the switch cabinet based on the first scattering parameter, the second scattering parameter and the third scattering parameter. And calculating the loop contact impedance of the switch cabinet through a preset loop contact impedance calculation formula. Through the method, high-precision, online and non-contact measurement of the contact impedance of the switch cabinet is realized, the method is obviously superior to the prior art, and an innovative solution is provided for state maintenance of power equipment.