38 results about "Impedance analyzer" patented technology

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 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 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 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.

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 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 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 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'.

The application relates to a cable end load analysis method and device based on cable head end impedance spectrum, which comprises the following steps: connecting the output port of an impedance analyzer to the core and metal shielding layer of a test cable; connecting the cable end to a pure resistive load, a plurality of specific impedance angle loads and an actual load to be measured in sequence; under various load conditions, collecting a plurality of impedance spectrum data corresponding to the cable end connected to various loads by using the impedance analyzer to test the incident sweep frequency signal of the cable; drawing the impedance spectrum data by using a computer to obtain the impedance amplitude spectrum waveform and the impedance phase spectrum waveform under various load conditions; comparing the impedance spectrum waveform of the actual load to be measured with the impedance spectrum waveform under the pure resistive load; determining the shift of the impedance spectrum oscillation peak value of the actual load to be measured according to the comparison result; and determining whether the actual load to be measured is capacitive or inductive according to the shift. The application can quickly and effectively determine the nature of the cable end load.

The cable state classification method based on the Bi-LSTM and the broadband impedance spectroscopy comprises the steps that a cable defect detection experiment platform is built, a standard impedance source is adopted to calibrate the measurement precision of an impedance analyzer, and then a detected cable is connected to the impedance analyzer; the method comprises the following steps: constructing three types of cable models through simulation: a normal cable model, a water-branch-containing cable model and an electric-branch-containing cable model, and obtaining a corresponding broadband impedance spectrum data set through establishing simulation models of the three types of cables; inputting the broadband impedance spectrum data set generated by simulation into a Bi-LSTM model for model training and exporting a confusion matrix; and importing broadband impedance spectrum data of a cable to be tested into the trained Bi-LSTM model, and outputting a classification result. According to the method, automatic and accurate classification of normal cables, water-branch-containing cables and electric-branch-containing cables is realized, and the efficiency bottleneck of manual detection is effectively overcome.

The application provides an intelligent control method for a hand rehabilitation training device, and relates to the technical field of device control. The method comprises the following steps: collecting pressure information and bending information, then acquiring image information, performing offset analysis, acquiring data collection offset categories, then analyzing a real-time training stage, performing assistance analysis, and then controlling the device, calculating force information array, and controlling the device through an impedance analyzer. The application mainly solves the problem that the existing hand rehabilitation training device lacks intelligent control, resulting in inaccurate device control and unstable training effect, and cannot be individually adjusted according to individual differences of users. Sensor technology is used to monitor the hand movement and strength of users, and the monitoring data is transmitted to the control system. The control system automatically adjusts the movement and strength of the training device according to the monitoring data and the preset training plan, thereby providing personalized rehabilitation training for users.

1. Name of the product in this design: Electrochemical Impedance Analyzer (Compact Type). 2. Purpose of this design: For testing the electrical parameters of electronic products. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

The invention discloses an inductor performance detection device, which belongs to the technical field of inductor manufacturing, and comprises a lifting rotation driving device and a lifting intermittent turntable, and a plurality of inductor vacuum suckers are distributed on the edge of the lifting intermittent turntable; the lifting rotation driving device is used for driving the lifting intermittent turntable to move and rotate by one station and to move and rotate by one station; an inductor feeding device, an inductor positioning device, an insulation resistance tester, an insulation resistance test unqualified inductor collecting box, a withstand voltage tester, a withstand voltage test unqualified inductor collecting box, an impedance analyzer and a capacitance test unqualified inductor collecting box are sequentially arranged on the periphery of the lifting rotation driving device and located below the lifting intermittent rotating disc. A vector network analyzer, a self-resonant frequency test unqualified inductor collection box and an inductor performance test qualified product collection box. The device has the characteristics of simple structure, high detection efficiency and clear classification of unqualified products.

The utility model relates to a portable nondestructive live fish detection device, including detection box, the left side of detection box is provided with bioelectrical impedance analyzer, the inner wall of detection box both sides is fixedly installed with the contraction gasbag, the opposite side of two contraction gasbags is fixedly installed with rubber board, the opposite side of two rubber boards is fixedly installed with air cushion. This portable nondestructive live fish detection device, the portable live fish detection device opens the top cover and puts in the live fish, and the fish will be between two air cushions, the inflation mechanism inflates the contraction gasbag and makes it swell, pushes the rubber board and air cushion close, clamps the fish, after clamping, multiple electrode pieces are pasted with the fish body outer skin, the bioelectrical impedance analyzer exerts multiple frequency band microcurrent on the fish body surface through the electrode piece, utilizes the conductivity difference of healthy and pathological tissue to detect impedance change, combines database comparison, can judge the fish health state nondestructively and quickly within three seconds, improves detection accuracy.

The invention provides a cable model parameter fitting method and device, computer equipment and a storage medium, and relates to the field of power equipment. The method comprises the following steps: measuring the frequency response of a cable sample at each frequency point of a first number through a broadband impedance analyzer; in the frequency responses under the first number of frequency points, frequency responses under the second number of characteristic frequency points are extracted to serve as a data set; a trapezoidal network structure of a lumped parameter model is adopted as an electric equivalent circuit, and to-be-fitted parameters are determined through the electric equivalent circuit; and based on the data set, performing automatic fitting on the to-be-fitted parameter by adopting an iterative genetic algorithm to obtain an optimal parameter value.

The invention discloses a liquid in-situ conductivity test experiment device in an ultrahigh-pressure low-temperature environment, which comprises an experiment table and an impedance analyzer placed on one side of the upper end of the experiment table, a placement frame is arranged at the upper end of the experiment table, and the upper end of the placement frame is detachably connected with a pressure-bearing cavity. A vacuum pump is installed on one side of the upper end of the experiment table, a pressurizing assembly is arranged on the other side of the upper end of the experiment table, an in-situ conductivity detection module is installed at the position, close to the lower end of the pressure-bearing cavity, of the outer wall of the pressure-bearing cavity, and a temperature control assembly is arranged on one side of the upper end of the experiment table. A heating compensation assembly is arranged on the outer wall of the temperature control assembly, a control cabinet is arranged on one side of the upper end of the experiment table, and a control panel is arranged in the control cabinet. According to the invention, the in-situ conductivity of the liquid can be tested, the test temperature and the change of the pressure environment can be controlled, and the in-situ conductivity test in the ultrahigh-pressure low-temperature environment can be realized.

The application belongs to the technical field of hydrophones, and discloses a low-frequency hydrophone sensitivity calculation method and system based on equivalent parameters. The application is aimed at the problem that the existing low-frequency hydrophone sensitivity calibration method mainly depends on the output voltage of the hydrophone under specific excitation to deduce the sensitivity, and cannot directly quantitatively characterize the sensitivity from the piezoelectric material parameters. Starting from the equivalent parameters, the quantitative relationship between the piezoelectric constant and the equivalent parameters is obtained based on the axisymmetric mode and the spherical symmetric mode, and the sensitivity of the low-frequency hydrophone is quantitatively characterized in the forward direction through the average radius and the piezoelectric constant. The application realizes the accurate correlation between the acoustic quantity and the electrical quantity through the equivalent parameters, can provide a simple and effective analysis method for the characterization of the working characteristics of the hydrophone, and the measurement process of the equivalent parameters is relatively simple, without relying on complex external acoustic equipment, and can be completed through conventional electronic measurement equipment such as an impedance analyzer.

A bioelectrical impedance analyzer includes a plurality of electrode sets attached to a subject to generate a bioelectrical signal, a signal processing unit electrically connected to the electrode sets and configured to convert the bioelectrical signal into a resistance and a reactance of the subject, and an estimation unit electrically connected to the signal processing unit and configured to obtain the bone mineral density of the subject according to the following formula: BMD=a+b×(R / H)+d×(Xc / H), where BMD represents the bone mineral density; a, b, and d are weighting coefficients; R represents the resistance of the subject; Xc represents the reactance of the subject; H represents a height of the subject. Accordingly, the bioelectrical impedance analyzer can achieve advantages of reducing measurement costs and rapid measurement.

The present application relates to the field of non-destructive detection of fish freshness, and particularly relates to a method for evaluating the freshness quality of ice-fresh big yellow croaker by using bioimpedance technology. The method for evaluating the freshness quality of ice-fresh big yellow croaker by using bioimpedance technology comprises the following steps: S1, immediately killing and processing fresh and healthy farmed big yellow croaker after being captured, and then storing the big yellow croaker in ice; S2, measuring the back and abdominal muscle bioimpedance values of the ice-fresh big yellow croaker in S1 at a frequency of 2 kHz or 100 kHz by using an impedance analyzer; S3, substituting the bioimpedance values Z 2kHz or Z 100 kHz measured in S2 into a big yellow croaker impedance and each quality change prediction model to calculate the values of key components and freshness indexes, wherein the key components include protein, fat and moisture, and the freshness indexes include color difference, pH, water activity, juice loss rate and total bacterial count; and S4, directly using the calculated values to replace the measured values to evaluate the fish body quality.

The invention discloses a wave-absorbing material complex permeability testing device and method based on adjustable coil and temperature control integration, and the testing device comprises an impedance analyzer, a program control and calculation module, and a testing clamp. The test clamp comprises a sealable sample groove, a temperature control unit, a plurality of coil groups with the number of turns set according to a preset rule, and a reed relay controllable switch. In the calibration stage of the test method, traversing coil combinations are controlled through a program to complete open circuit, short circuit and standard load calibration, multiple temperature points are covered to form a reusable calibration file, and after a to-be-tested material is injected in the test stage, coil combinations are selected through program control to complete standard load calibration. The number of turns of the coil is calculated and optimized through a formula, parameters fall into a high-precision area of the impedance analyzer, series resistance and inductance of the coil are measured, a real part and an imaginary part of the relative permeability are calculated through the formula, and continuous testing of multiple temperature points can be achieved. The precision of the impedance analyzer can be dynamically matched, the temperature stabilization time is shortened, and the method is suitable for nondestructive testing of liquid / powder materials.

The utility model discloses a device for detecting the total number of bacterial colonies in milk, which comprises a rack, and a PLC (programmable logic controller) and an audible and visual alarm are sequentially mounted on the outer side wall of the rack. When the milk sample collecting device runs, the self-locking motor in the shell is started to be matched with the transmission action of the screw rod and the nut seat to drive the nut seat to slide back and forth at the bottom of the shell, so that the driving frame and the sample collecting pipe can be driven to move back and forth, and the sample collecting pipe is controlled to collect a milk sample towards a production line pipeline; the sample collecting pipe can automatically move to the impedance analyzer main body to output a sample, the total number of bacterial colonies is indirectly quantified by measuring the electrical property change caused by microbial metabolism by utilizing an impedance method, and subsequently, the sample collecting pipe is driven to move to the clear water tank to suck clear water for washing, and is moved to the upper part of the sewage tank to empty the cleaned sewage; therefore, the device achieves a self-cleaning function, and the problem of cross contamination of different milk samples is avoided.

The invention relates to the technical field of magnetic element measurement, in particular to an impedance measurement method for common-mode inductors under direct-current bias, and the method comprises a differential-mode impedance measurement mode and a common-mode impedance measurement mode, the differential-mode impedance measurement mode comprises the following steps: one ends of two common-mode inductors with consistent structural parameters are short-circuited, and the other ends of the two common-mode inductors are short-circuited; the other ends of the two parallel branches are respectively connected into the two parallel branches; in a parallel branch, an impedance analyzer, an isolation capacitor and an alternating current isolation inductor are sequentially connected in series and then are connected to the positive electrode of a direct current bias source; in the other parallel branch, an isolation capacitor is connected in series and then is connected to the negative electrode of the direct current bias source to form a closed loop; bias current is applied through a direct-current bias source, so that the two common-mode inductors are in a direct-current magnetic bias state; and applying an alternating-current measurement signal through the impedance analyzer, and collecting measurement data to obtain the differential-mode impedance of the common-mode inductor under the direct-current bias. Therefore, the problems of measurement distortion, insufficient anti-interference capability, insufficient equipment protection and the like in the prior art are solved.

According to the evaluation method, firstly, a bioelectrical impedance analyzer is provided, the bioelectrical impedance analyzer is provided with a data database, parent data of different races are stored in the data database, and then a testee inputs parameters such as races, genders and ages into the bioelectrical impedance analyzer; then, the bioelectrical impedance analyzer obtains measurement data according to the height and weight of the testee and parameters input by the testee, and finally, the bioelectrical impedance analyzer analyzes and compares the measurement data of the testee with parent data of the data database, so that the body composition condition of the testee in the race can be evaluated. Therefore, the body composition evaluation requirements of different races are met, and the accuracy of evaluation results is improved.