144 results about "Contact impedance" patented technology

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 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 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 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.

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 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.

The present invention proposes a sensory perception system for robot-assisted laparoscopic surgery. The present invention includes an electrosurgical forceps coupled to a surgical tool, an electrosurgical radio frequency signal generator, and an impedance measurement circuit. The impedance measurement circuit includes a measurement sensor for measuring a signal corresponding in magnitude to a value indicative of the contact impedance between the forceps and the patient's tissue; an oscillator; a first electronic circuit having a resistor and a voltage limiter for protecting the measurement sensor and the oscillator; and a second electronic circuit having a switch. The sensor and the oscillator are connected to the forceps through a power cable of the surgical tool. A processor connected to the measurement circuit receives the measurement signal and converts the measurement signal into a force vector, the modulus of which is a function of the measured contact impedance and the argument of which is a function of the trajectory being followed.

The application discloses a novel conductive chest strap preparation method, a permeable conductive reinforcing composition and a surface micro-erosion pretreatment gel. The method first weaves a segmented belt containing stretchable areas and non-stretchable electrode collection areas; then a thixotropic pretreatment gel is coated on the surface of the electrode area, a micro-erosion layer is formed on the surface of the fiber by using a solvent; then the permeable conductive reinforcing composition is forcedly absorbed into the fiber bundle under the condition of vacuum negative pressure; finally, the resin and the fiber form an interpenetrating network and chemical bonding through gradient temperature curing. Through the synergistic effect of physical structure restriction and micro-chemical anchoring, the application solves the problems of easy delamination and cracking of the conductive layer and unstable contact impedance in the traditional process, meanwhile, the gel characteristics are used to block the solvent wicking and diffusion, the elasticity of the substrate is effectively protected, and the durability and signal collection accuracy of the product are significantly improved.

The application discloses a current sensor pin bending processing control system and processing equipment, relates to the technical field of current sensor pin bending processing, and through fusion collection of three types of disturbance parameters with different physical dimensions and response mechanisms, namely, bending acceleration ZWa, pin surface contact impedance disturbance ZBd and friction spectrum response ZMc, the sensing coverage range of the system for multi-source abnormal phenomena in the processing process is significantly expanded, the identification blind area of a traditional system relying on a single force or displacement signal is made up for, and the sensitivity to non-explicit disturbance characteristics is improved. Nonlinear interaction modeling of the three disturbance factors is carried out through the micro-disturbance coupling strength index Ψ, the system can not only identify single-variable fluctuations, but also capture the collaborative evolution trend between variables. This structure enables the system to have the ability to identify the structural imbalance and coupling intensification trend of the disturbance in advance, and has higher fault foresight and active response capability.

According to the pulse electric field ablation effect evaluation system based on artificial intelligence, the ablation depth can be accurately predicted through deep analysis of intracardiac electric signals and attachment impedance data and by means of XGBoost and other artificial intelligence algorithms, and real-time feedback and optimization suggestions are provided for clinical treatment. The system is helpful for improving the treatment precision and safety, and has important clinical application value.

The application discloses a preparation method of an electric field-induced hydrogel electrode and application thereof. The method mainly uses polyvinyl alcohol as a base material, combines conductive media (PEDOT:PSS, NaCl or CaCl), a chemical crosslinking agent (glutaraldehyde) and a reversible coordination crosslinking agent (sodium tetraborate decahydrate), and introduces tannic acid to improve adhesion. The core of the method is that the electric field-induced hydrogel is added dropwise to the surface of an electrode to be grown, a redox reaction is induced in a cathode area by applying an electric field, the pH value of a solution is rapidly increased, the coordination crosslinking of sodium tetraborate is activated, and the hydrogel is rapidly and in-situ solidified on the surface of the electrode. The hydrogel electrode prepared by the method has high tensile property, high conductivity and self-repairing characteristics, has low contact impedance and high signal-to-noise ratio, and can be used as a high-performance flexible electrode and applied to detection of electrocardiosignal and other electrophysiological signals, and has obvious advantages compared with commercial electrodes.

The invention discloses a progressive risk prevention and control system and method for an electrical stimulation physiotherapy instrument, and belongs to the technical field of medical equipment. The system integrates a central control unit, and an electrode contact quality detection module, a nerve excitation threshold detection module, an electromagnetic environment interference detection module, a risk grade evaluation module and a strategy generation module which are electrically connected with the central control unit. The system evaluates the risks of electrode poor contact, nerve over-excitation and electromagnetic interference respectively by detecting a micro-current contact impedance dynamic spectrum, a myoelectricity composite action potential incubation period change rate and a stimulation waveform distortion entropy. The system adopts a progressive detection method, divides risks into three levels according to key indexes such as a contact quality index, a latency drift index and waveform distortion entropy, and automatically generates corresponding prevention and control strategies for different risk levels, such as automatic deoxidation pulse, adaptive reduction of stimulation parameters or emergency termination of treatment. Accurate risk identification and dynamic prevention and control in the electrical stimulation physiotherapy process are realized, and the safety is improved.

To realize a connector for an interface which enables decrease of impedance of a contact while inhibiting displacement of a tip of the contact and can be manufactured easily.SOLUTION: A connector (1) for an interface of the disclosure includes: a housing (11); and a contact assembly (13) held by the housing (11). The contact assembly (13) includes: contacts each having a first electric contact and a second electric contact; an insulation member (24) which holds the contacts; and a locator (25) which corrects displacement of the second electric contacts in a width direction. The locator (25) has partition walls (25b) each of which is disposed between the contacts. At least parts of the partition walls (25b) partition tips of at least parts of the contacts from each other and do not exist between middle parts of the at least parts of contacts.SELECTED DRAWING: Figure 6

This invention relates to the field of battery testing technology, specifically to a method, apparatus, and system for recycling and testing lithium battery modules. The invention obtains the voltage rebound coefficient at each time point after the current cutoff; based on the time characteristics of different times after the current cutoff and different preset response time constants, it obtains the unit step response function value at each response time constant at each time point after the current cutoff; based on the unit step response function values ​​at all response time constants and the voltage rebound coefficient at different times after the current cutoff, it obtains the optimal voltage drop component for different response time constants and obtains the abnormal residual energy value; combined with the electrode temperature distribution at different times, it obtains the contact impedance coupling coefficient and diffusion impedance coupling coefficient; and performs recycling and testing on the lithium battery module. This invention improves the accuracy of module recycling by accurately analyzing the abnormal residual energy value and using a thermoelectric characteristic coupling criterion based on the electrode temperature rise rate.

A method and apparatus of an emergency starting power supply used to start a device or energize a battery. This emergency starting power supply automatically detects the contact impedance of the device or battery and provides prompts from a user interface to the user based on this detected contact impedance. The prompts guide the user as the user on how to adjust the impedance of the connections to the device or battery so that it is connected optimally to the device or battery so that the emergency starting power supply can provide the device or battery with enough energy to start the motor or engine.