70 results about "Impedance analyzer" patented technology

The present invention discloses a puncture device and system with a hematoma monitoring function, which relates to the technical field of biomedical engineering. The device includes: an epidural puncture needle, including a needle body and a needle hub; an epidural catheter for entering the epidural space through the epidural puncture needle; the front end of the epidural catheter is an insertion section, which is longitudinally inserted along the epidural space after entering the epidural space, and an impedance measurement structure is provided corresponding to the insertion section for measuring the impedance value around the insertion section and transmitting it to an impedance analyzer; the impedance analyzer is used to receive the aforementioned impedance value and evaluate whether there is a hematoma in the epidural space according to the change information of the impedance. The present invention can sensitively, timely and accurately identify the occurrence and development risks of epidural hematoma, thereby helping to improve the quality of clinical medical safety and improve the perioperative prognosis of patients.

The invention relates to the technical field of automobile electrical detection, provides an automobile wire harness wire insulation skin damage detection method and system, and aims to solve the technical problem that a certain loop insulation skin damage position point is difficult to find in the prior art. Comprising a plane capacitance sensor used for measuring capacitance change between the plane capacitance sensor and a to-be-measured wire harness to obtain a charge signal used for representing the damage state of an insulating material of the to-be-measured wire harness; the charge amplifier is used for performing voltage conversion and amplification processing on the charge signal to obtain a voltage signal; the impedance analyzer is used for calculating impedance through the voltage signal and the current signal, drawing a Bode diagram based on the obtained impedance, and performing index parameter extraction on the Bode diagram to obtain various index parameters; and the upper computer is used for carrying out feature extraction on the multiple index parameters to obtain feature data, and analyzing the damage state of the insulating material of the wire harness to be detected according to the feature data to obtain a detection result.

The invention provides a resonance control method for an excimer lamp driven by a steep pulse edge, and relates to the technical field of molecular lamps. The resonance control method of the excimer lamp driven by the steep pulse edge comprises the following steps: S1, based on a dielectric barrier discharge equivalent circuit model, adopting a fast Fourier transform spectrum analysis method, measuring fundamental wave impedance characteristics of an LC resonance network through an impedance analyzer, establishing a transfer function containing parasitic parameters: Z (s) = [sLr + 1 / (sCr)] Rarc, and generating an initial resonance parameter set; by establishing a transfer function model containing parasitic parameters, combining fast Fourier transform spectrum analysis and accurately extracting fundamental wave impedance characteristics, the problem of resonance point offset caused by neglecting the parasitic parameters in a traditional method is solved, the precision of an initial resonance parameter set is improved, real-time phase difference data are identified on line by using a recursive least square method, and the real-time phase difference is obtained. Resonant frequency changes are dynamically tracked, frequency drift errors are compensated, resonance point tracking precision is controlled within + / -0.1%, and invalid discharge energy loss is remarkably reduced.

A method of determining beta radiation intensity based on calculated resonance frequency and calculated quality factor can include providing an electrical sensor comprising at least one prong, irradiating the first composite material of the one of the plurality of planar surfaces and the material of the second section with beta radiation from a beta radiation source; measuring at least one impedance value from the electrical sensor with an impedance analyzer; calculating at least one resonance frequency value based on the measured at least one impedance value; calculating at least one quality factor value based on the calculated at least one resonance frequency value; and determining the beta radiation intensity based on the calculated at least one resonance frequency value and the calculated at least one quality factor value.

The application provides an ultrasonic machining tool holder assembly quality detection method, device, equipment and medium, and relates to the technical field of ultrasonic machining. The ultrasonic machining tool holder assembly quality detection method comprises the following steps: acquiring an assembly quality detection graph generated by an impedance analyzer by sweeping frequency on a non-contact ultrasonic tool holder in a no-load state; determining an assembly quality detection result between a tool holder body and a transducer and / or an assembly quality detection result between a non-contact electric energy transmission device secondary side and the transducer according to a comparison result between the assembly quality detection graph and a preset target graph; wherein the non-contact ultrasonic tool holder comprises a machining tool holder and the non-contact electric energy transmission device; and the machining tool holder comprises the tool holder body and the transducer. The application can accurately determine the assembly quality of the non-contact ultrasonic tool holder.

The utility model provides a GJB289A bus network state detection device in an external field environment. The GJB289A bus network state detection device comprises a communication module, a waveform analysis module and an impedance analyzer, the communication module is in communication connection with the waveform analysis module and the to-be-tested bus, performs communication test on the to-be-tested bus, and records the communication state of the to-be-tested bus; the waveform analysis module is in communication connection with the bus to be tested to realize signal waveform test; the impedance analyzer is in communication connection with a to-be-tested cable corresponding to the to-be-tested bus, and carries out an attenuation test on the to-be-tested cable. By integrating the communication module, the waveform analysis module and the impedance analyzer, a GJB289A bus network can be tested to ensure the reliability and stability of communication. And the waveform analysis module and the impedance analyzer can test the signal waveform on the bus to be tested and analyze the impedance, so that the test requirements are met.

The application provides an indoor automatic ore drawing experiment simulation system and method, and relates to the field of automatic control. The indoor automatic ore drawing experiment simulation system comprises an adjustable ore drawing bin, an arch breaking device, a conveyor belt, a flow control plate, an impedance analyzer, a storage bin, a mechanical linkage device, an inclined guide rail, a laser detector and a computer control center. The system utilizes the specific conductivity of micro-difference materials to quickly detect, thereby obtaining a fast method for uniquely identifying the space movement law before and after particle drawing, simulating different inclinations, angles, segmented heights, ore drawing step distances and ore drawing port sizes, obtaining the drawing shape and loss and dilution rate, automatically detecting and solving the ore drawing port blockage problem, and repeatedly simulating the ore drawing conditions for particle drawing experiments under the same parameters without human intervention.

The invention discloses a solution separation control system for rubber anti-aging agent production, and relates to the technical field of rubber anti-aging agent separation control, and the system comprises the following modules: a radio frequency admittance detection module for respectively obtaining an inorganic phase test solution, an organic phase test solution and an emulsion layer test solution, obtaining an inorganic phase dielectric constant range, an organic phase dielectric constant range and an emulsion layer dielectric constant range at different temperatures through the inorganic phase test solution, the organic phase test solution and the emulsion layer test solution by using an impedance analyzer; according to the scheme, the interface height is measured through the radio frequency admittance meter and the ultrasonic interface level meter together, and whether the measurement result of the radio frequency admittance meter or the measurement result of the ultrasonic interface level meter is selected is judged according to the position of the probe of the radio frequency admittance meter, so that the situation that the probe penetrates through an emulsion layer and is polluted to affect the accuracy of the measurement result is avoided; and the influence of high-temperature steam and bubbles on the accuracy of the measurement result is avoided, so that the measurement result of the solution interface height is more accurate.

The invention discloses a magnetic ring saturation characteristic measurement method and device, and the method comprises the steps: building a measurement circuit which comprises an arbitrary waveform generator, a power amplifier, a measured magnetic ring and a matched load based on the reference data of an impedance analyzer, and setting a voltage sensor, a current sensor and a thermocouple to obtain the voltage, current and temperature data of the measured magnetic ring; impedance and inductance data are obtained through calculation and serve as actual measurement data; comparing the measured data with the reference data, defining the ratio of the inductance data attenuation of the measured magnetic ring to the inductance data measured by the impedance analyzer as the saturation rate of the magnetic ring, and recording the signal type, frequency, amplitude and temperature rise corresponding to the magnetic ring at the moment; by fixing the signal type and the frequency and adjusting the signal amplitude, the saturation characteristic of the measured magnetic ring along with the amplitude change under the signal type and the current frequency is obtained; whether the magnetic ring is saturated or not and the saturation degree can be judged, and whether the magnetic ring is available or not is judged by measuring the temperature rise after the magnetic ring is saturated.

The invention discloses a cable impedance spectroscopy defect positioning method and system, and belongs to the technical field of cable defect localization, and the method comprises the steps: measuring a to-be-detected cable through an impedance analyzer, obtaining a head end input impedance spectrum of the to-be-detected cable, comparing the head end input impedance spectrum with a head end input impedance spectrum of a healthy cable, and judging whether the to-be-detected cable has a defect or not; if defects exist, a plurality of pieces of temperature data in the circumferential direction of the intermediate joint are collected, whether the to-be-detected cable is aged or not is judged through the temperature difference between the peak value temperature data and the valley value temperature data, if not, the obtained head end input impedance spectrum of the to-be-detected cable is utilized, the frequency domain reflection method is directly used for conducting defect positioning on the cable, and if aging occurs, the frequency domain reflection method is used for determining the defect of the to-be-detected cable. And if not, compensating the obtained head end input impedance spectrum of the cable to be detected according to the aging degree, and carrying out defect positioning on the cable by using a frequency domain reflection method based on the compensated head end input impedance spectrum. According to the invention, interference of non-uniform aging on defect positioning can be weakened, and accurate positioning of cable defects is realized.

This invention relates to the field of bioelectrical impedance analysis (BIA) technology, and more particularly to a calibration device and method for a BIA. The technical solution is as follows: A calibration device for a BIA, the device being connected to a BIA host via a communication interface and a calibration port. The device includes: a main control unit for communicating with the host and parsing instructions from the host; a high-speed multiplexer, the control terminal of which is connected to the main control unit, and the output terminal connected to the calibration port; and a standard impedance network composed of multiple high-precision passive components, including resistors, capacitors, inductors, and their series-parallel combinations, wherein each impedance component is connected to a different input channel of the high-speed multiplexer. Through a highly integrated standard impedance network and an automatic switching mechanism, the calibration process is fully automated, completely eliminating human error and greatly improving calibration efficiency and consistency.

An impedance analyzer chip assembly may include a plurality of sensing regions, where each region of the plurality of sensing regions is configured to sense a gas, chemical, physical, or biological analyte. The impedance analyzer chip assembly may also include one or more processors configured to output one or more re-configurable impedance values across a frequency range of at least six orders of magnitude, output one or more re-configurable impedance values from one or more of the sensing regions of the plurality of sensing regions, concurrently output two or more impedance values from two or more of the sensing regions of the plurality of sensing regions, and concurrently output one or more impedance values at two or more frequencies.

The utility model discloses a household osteoporosis-sarcopenia combined monitoring and rehabilitation assisting device in the technical field of rehabilitation treatment, which comprises a leg sleeve, a portable ultrasonic bone mineral density instrument and a bioelectrical impedance analyzer, a plurality of grooves are arranged on the periphery of the leg sleeve, a plurality of electromagnets are fixedly connected in the leg sleeve along the periphery, and the electromagnets are connected with the bioelectrical impedance analyzer. A controller is fixedly connected in the leg sleeve, the controller is electrically connected with a data plug, and the portable ultrasonic bone mineral density instrument and the bioelectrical impedance analyzer are both in signal connection with a data socket. Through the arrangement of the leg sleeve, the electromagnet, the data plug and the data plugboard, the weight of the required balancing weight is determined according to data monitored by the portable ultrasonic bone mineral density instrument and the bioelectrical impedance analyzer, and then the balancing weight is attracted through the electromagnet, so that the weight of the balancing weight is adjusted. Through data, patients with osteoporosis and patients with sarcopenia can conveniently carry out aerobic training such as load-bearing jogging according to physical conditions, and therefore the recovery training effect is better achieved.

A device for detecting a hydration status of a user is disclosed. The device includes an electrode patch configured to be positioned on a user. The electrode patch includes a substrate including a first side positioned against the user and a second side, and a first electrode and a second electrode both positioned on the second side. The device further includes an impedance analyzer including a control circuit electrically coupled to the first electrode and the second electrode when the impedance analyzer is engaged with the electrode patch. The control circuit including a processor and a memory, the memory storing instructions executed by the processor to transmit an electrical signal to the first electrode and the second electrode, determine an impedance between the two electrodes, determine a hydration level based on the impedance, compare the hydration level to a threshold range, and transmit a notification based on the hydration level.

The invention provides a power cable local defect degree and type evaluation method based on an impedance spectroscopy method. The power cable local defect degree and type evaluation method comprises the following steps: acquiring an attenuation coefficient, a phase shift coefficient and characteristic impedance of a healthy cable in a frequency range; calculating the impedance spectrum of the to-be-measured cable, and measuring the impedance spectrum of the to-be-measured cable through an impedance analyzer; drawing a defect positioning function curve by adopting an improved orthogonal integral algorithm; obtaining a calculation peak value; calculating the reflection coefficient and the characteristic impedance of each defect section; and judging the defect degree and type, calculating the ratio of the characteristic impedance of the defect section to the characteristic impedance difference of the healthy cable, and obtaining the degree quantitative evaluation of the defect section. By calculating the severity of the defect section and judging the defect type, quantitative calculation and comparison of the defect degrees of various types of cables are realized, a unified defect degree evaluation method and a type judgment method are formulated for various types of cables, the anti-interference capability is relatively high, and the reliability is high. And a new method and thought are provided for cable defect state evaluation based on the impedance spectrum.

The present invention discloses a method for detecting biochemical molecules based on the quantum capacitance effect of conductive composite materials, which belongs to the field of molecular sensor technology. A three-electrode system consisting of a working electrode, a reference electrode, and a counter electrode is used for testing. A solution is dripped into a liquid tank so that both the working electrode and the reference electrode are in contact with the solution to form a circuit. A phase-locked amplifier or an impedance analyzer is used for quantum capacitance testing. Based on the test results, the liquid environment in which the sensor is located is evaluated to detect the concentration of biochemical molecules in the liquid. The present invention is easy to prepare, has a controllable structure, high stability, and good biocompatibility. It can realize Internet-style instant sensing and information communication and has extremely high detection sensitivity.

The application relates to an integrated wireless passive pressure sensor and an environmental air pressure detection device. The integrated wireless passive pressure sensor comprises a sealed substrate, a sensitive capacitor structure, a compensation structure, a first inductor connected with the sensitive capacitor structure, a second inductor connected with the compensation structure, and pads respectively welded with the first inductor and the second inductor. An impedance analyzer can be externally connected through the pads to measure a compensation resonance frequency of a compensation resonance loop composed of the compensation structure and the second inductor. When the air pressure in the environment where the integrated wireless passive pressure sensor is located changes, the air pressure sensitive resonance frequency of an air pressure sensitive resonance loop composed of the sensitive capacitor structure and the first inductor can be measured. The resonance frequency caused by the change of the air pressure in the environment can be determined according to the air pressure sensitive resonance frequency and the compensation resonance frequency. The integrated wireless passive pressure sensor can improve the measurement accuracy.

To provide an electrochemical impedance analyzer capable of addressing a case where each circular arc of Nyquist diagram indicated by EIS data of a measured battery may include a plurality of reaction resistance components and highly accurately deriving an equivalent circuit from the EIS data.SOLUTION: An electrochemical impedance analyzer 10 comprises a storage part 14 storing a material property database 14a including material feature quantity data, an acquisition part 12a acquiring EIS data, and an analysis part 12b deriving the equivalent circuit. The analysis part 12b identifies time constant of each of a first reaction resistance component and a plurality of second reaction resistance components by reference to the material property database 14a when one first reaction resistance component composing the equivalent circuit is determined to be composed by parallel connection of the plurality of second reaction resistance components, and derives the equivalent circuit by performing fitting processing using the identified time constant.SELECTED DRAWING: Figure 1

A described example relates to a system that includes a microfluidic device and an impedance analyzer. The microfluidic device includes a microchannel extending through a portion of a housing. The microchannel is configured to receive a fluid sample including blood cells that flows along in a direction of fluid flow through the microchannel. The microchannel includes a plurality of micropillar arrays along the direction of fluid flow, and each of the plurality of micropillar arrays is located between a respective pair of electrodes in the microchannel. The impedance analyzer can be coupled to each of the electrodes and configured to measure electrical impedance of at least some of the micropillar arrays at multiple times, in a wash-free assay, including at least one impedance measurement before the fluid sample is flowing through the microchannel and at least one impedance measurement after the fluid sample is flowing through the microchannel.

The invention discloses a cascade system bus voltage stability domain evaluation method under small current disturbance, and relates to the technical field of power supply and distribution systems. The method comprises the following steps: constructing an impedance ratio test circuit; introducing non-intrusive current signal interference into bus voltage of the cascade system by an impedance analyzer to excite a feedback loop of the cascade system to operate; the stability criterion of the Middlebrok is simplified, and an improved stability criterion is obtained; according to the corresponding amplitude-frequency Bode diagram data of each load operation point obtained by the impedance ratio test circuit, the amplitude data of the corresponding amplitude-frequency Bode diagram of each load operation point is integrated and fitted through Matlab, and a fitting curved surface based on a test result is obtained; and comparing the fitting curved surface with a judgment area determined based on a stability criterion, and determining a stable operation boundary of the cascade system in a wide load range. According to the invention, the problem of the bus voltage stability of the black box cascade converter system in a wide load range is solved, and a test method without invading a bus line is provided.

The invention discloses a magnesium electrolyte conductivity on-line determination device and a magnesium chloride concentration determination method, the device comprises an impedance analyzer, a controller, an isolation region, a moving electrode system and a static electrode system, the moving electrode system comprises a metal electrode coated with a first insulation tube and a linear power source driving the metal electrode to rise and fall; the static electrode system comprises a second insulating tube and a metal counter electrode, the metal counter electrode comprises a conducting rod and a conducting strip, and the conducting strip is located below the metal electrode. An isolation area is arranged in the magnesium collection chamber, and only electrolyte is arranged in the isolation area, so that the influence of metal magnesium liquid on an on-line measurement result is reduced; the moving electrode system, the static electrode system, the impedance analyzer and the controller are combined to obtain the conductivity of the electrolyte in the magnesium collecting chamber, so that the conductivity of the electrolyte in the electrolytic cell can be monitored online in real time, and the concentration of magnesium chloride in the electrolyte in the magnesium electrolytic cell can be further monitored online based on the conductivity of the electrolyte and the temperature of the electrolyte. And the result reliability is improved.

The invention discloses an electrical impedance analyzer and system for evaluating hematoma of physiological tissue and a puncture device, and relates to the technical field of biomedical engineering. The electrical impedance analyzer is connected with the electrical impedance measuring structure and can receive electrical impedance data, sent by the electrical impedance measuring structure, of the physiological tissue in real time and evaluate whether hematoma exists or not according to change information of electrical impedance. The method can sensitively, timely and accurately recognize the hematoma occurrence and development risk of the physiological tissue, so that the clinical medical safety quality is improved, and the perioperative prognosis of a patient is improved.

Evaluation of immune cells and cancer cells is provided by assessing cytolysis of cancer cells by effector cells, comprising: a) providing a cell-substrate impedance monitoring device operably connected to an impedance analyzer, the device including a well for receiving cells and an electrode array in the bottom of the well, and further operably connected to an imaging unit; b) adding target cells characterized as cancer cells to the well; c) disposing a layer comprising extracellular matrix (ECM) over the target cells; d) adding effector cells on top of the ECM layer; and e) imaging the well and monitoring the cell-substrate impedance of the well to determine invasion of the effector cells through the ECM layer and the effectiveness of the effector cells in killing the target cells directly or via migration and invasion through the extracellular matrix.

The invention discloses a broadband impedance spectroscopy-based high-voltage cable line aging analysis method, which comprises the following steps of: firstly disconnecting a power supply of a cable to be detected, discharging and grounding, and suspending the end part to expose a metal wire core and a shielding layer after the connection is removed; using a time domain reflectometer to measure the length of the cable and confirm the joint position; after carrying out short circuit and open circuit correction on the impedance analyzer, connecting the test clamp to a cable metal wire core and a shielding layer to form a closed loop; carrying out broadband impedance spectroscopy test in a frequency range of 500Hz to 5MHz, and recording voltage, current, impedance amplitude and phase difference; calculating a theoretical impedance spectrum of the cable based on a transmission line model, comparing first peak frequencies of theoretical and actually measured impedance spectrum amplitudes, and calculating a peak offset; and evaluating the aging state of the cable according to the peak offset. The method realizes lossless rapid evaluation of the aging state of the high-voltage cable line, is short in test time, and avoids accumulated damage of lossy detection to the service life of the cable.

The invention provides a frequency selection method of an eddy current probe, which comprises the following steps: S100, performing impedance analysis on the eddy current probe through an impedance analyzer to obtain a resonant frequency point f of the eddy current probe; and S200, by taking the resonant frequency point f of the eddy current probe as a center, respectively carrying out scanning analysis on two states of the eddy current probe in the air and on the carbon fiber material to obtain the optimal frequency of the eddy current probe during nondestructive testing of the carbon fiber material. And the detection frequency of the eddy current probe can be accurately selected, so that the detection efficiency is improved, and the detection precision and the detection sensitivity can be ensured.

The invention relates to a system for detecting contact between a first body part of a person and a second body part, comprising an electrical circuit, comprising a first electrode and a second electrode, each of which is electrically connected to a control device, and wherein the first electrode is in electrical contact with a first location on the person, and the second electrode is in electrical contact with a second location on the person, the second location being different from the first location, wherein the control device comprises a signal generator by means of which an alternating current or voltage signal can be applied across the electrodes, and a signal detector, and the signal detector comprises an impedance analyzer by means of which an electrical impedance between the first electrode and the second electrode can be measured. The first location and / or the second location is / are spaced apart from the body parts between which contact is formed. Furthermore, the invention relates to a method for detecting contact between body parts of a person.

The present disclosure relates to a system (100) for detection and identification of at least one species in a sample in an ionic exchange membrane (110), comprising an ion exchange membrane (110), an impedance analyser (120), source (141) and target electrodes (142), a voltage and / or current source (140) arranged to provide an electric potential difference, a computer (170), and at least two impedance electrodes (121, 122) arranged at the ion exchange membrane (110) and connected to the impedance analyser (120). The source (141) and target electrodes (142) are connected to said source (140), and are arranged to upon addition of source (151) and target electrolyte (152) be in ionic contact with a first (111) and second region (112) of the ion exchange membrane (110) respectively. The computer (170) is arranged to obtain source data comprising voltage data and / or current data from said source (140); obtain impedance data from the impedance analyser (120); and determine the presence of said at least one species in said sample based on the obtained source data, the obtained impedance data, and predetermined reference data for the ion exchange membrane (110).

This invention discloses a soil sample resistivity measuring device and method, comprising a soil sample box and a cover plate covering the soil sample box. Emitting electrode plates are placed inside both ends of the soil sample box, and two receiving electrode rods are inserted in the middle. The bottom of the transmitting electrode plates contacts the bottom of the soil sample box, and their sides extend to the side walls of the soil sample box. The cover plate has transmitting electrode slots for the transmitting electrode plates to pass through and receiving electrode holes for the receiving electrode rods to pass through. The transmitting electrode plates and receiving electrode rods are respectively connected to a full-waveform impedance analyzer after exiting through the transmitting electrode slots and receiving electrode holes, forming a four-electrode connection structure. This device, by adding a cover plate to the soil sample box and leading the long, strip-shaped transmitting electrode plates out from the top holes of the cover plate, can greatly reduce the contact between external air and the soil sample, avoid moisture evaporation, reduce the influence of the external environment on the soil sample, and ensure the accuracy of the test results.

Evaluating immune and cancer cells is provided for by assessing cytolysis of cancer cells by effector cells, which includes: providing a cell-substrate impedance monitoring device operably connected to an impedance analyzer, wherein the device comprises a well for receiving cells and an electrode array at a base of the well, the device further operably connected to an imaging unit; b) adding target cells characterized as cancer cells to the well; c) disposing a layer comprising an extracellular matrix (ECM) over the target cells; d) adding effector cells over the ECM layer; and e) imaging the well and monitoring cell-substrate impedance of the well to determine invasion of the effector cells through the ECM layer and effectiveness of effector cell killing of the target cells either directly or via migration and invasion through extracellular matrix.

The invention discloses a wireless passive sensing system and method based on adaptive gain. The wireless passive sensing system comprises a reading resonator and two sensing resonators. The read resonator includes a capacitor, an inductor, and a negative resistor. Each of the two sensing resonators comprises a capacitor, an inductor and a resistor. The natural frequencies of the two sensing resonators are kept symmetrically offset relative to the natural frequency of the reading resonator. By adding disturbance to any resistor in the two sensing resonators, a driving system is expanded to EP5, and the sensitivity in the sensing process is improved. Meanwhile, a vector network analyzer or an impedance analyzer is used as a negative resistor, and a zero crossing point of an input impedance imaginary part or a reflection coefficient imaginary part is used as an eigen frequency criterion in frequency scanning, so that a traditional'fixed gain-scattering extreme value 'is converted into a new measurement form of'impedance imaginary part zero crossing point-eigen frequency direct reading'.