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68 results about "Electrical impedance spectroscopy" patented technology
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Electrochemical impedance spectroscopy enabled continuous glucose monitoring sensor systems
ActiveUS20110040163A1CatheterDiagnostic recording/measuringElectrical resistance and conductanceElectrical impedance spectroscopy
The use of electrical impedance spectroscopy to adjust calibration settings in an in vivo monitoring system, such as an in vivo continuous glucose monitoring sensor. The adjustments can compensate for the condition of the sensor membrane in vivo.
Owner:ASCENSIA DIABETES CARE HLDG AG
Electrochemical impedance spectroscopy enabled continuous glucose monitoring sensor system
ActiveUS8868151B2Material analysis by electric/magnetic meansSensorsElectrical resistance and conductanceElectrical impedance spectroscopy
The use of electrical impedance spectroscopy to adjust calibration settings in an in vivo monitoring system, such as an in vivo continuous glucose monitoring sensor. The adjustments can compensate for the condition of the sensor membrane in vivo.
Owner:ASCENSIA DIABETES CARE HLDG AG
Determining surface wetting of rock with changing well fluids
InactiveUS20140062489A1Electric/magnetic detection for well-loggingSurface/boundary effectElectrical impedance spectroscopyDouble-layer capacitance
Methods and apparatuses for determining surface wetting of a rock material with changing well fluids. In general, the methods according to the invention include measuring electrical impedance spectroscopy (“EIS”) for a system simulating downhole conditions for the wetting of a surface. Methods and apparatuses for making EIS measurements model double-layer capacitance at a downhole surface in a well, from which the nature and quantification of the wetting of the surface can be inferred.
Owner:HALLIBURTON ENERGY SERVICES INC
Use of metal-organic frameworks and metal oxides for sensing chemicals using electrical impedance spectroscopy
ActiveUS10495592B1The implementation process is simpleHigh sensitivity detectionFuel testingTesting metalsMetal-organic frameworkChemical agent
Provided are processes for the sensitive detection of the presence of, absence of, and optionally the identity of, one or more chemical agents. The processes use the binding of chemical agents to a metal organic framework or metal oxide / hydroxide electrically connected to a pair of electrodes to detect low levels of chemical in a sample. By exposing the surface of the metal organic framework or the surface of the metal oxide / hydroxide to the chemicals and then measuring changes in impedance magnitude and / or phase shift through electrical impedance spectroscopy, the presence of a chemical agent is readily detected.
Owner:UNITED STATES OF AMERICA
Micro-flow control chip for cell tissue culture and real-time monitoring and use method thereof
ActiveCN108485972AEasy to controlEasy to detectBioreactor/fermenter combinationsBiological substance pretreatmentsMicrofluidic channelCell tissue culture
The invention discloses a micro-flow control chip for cell tissue culture and real-time monitoring and a use method thereof. The chip comprises a glass substrate layer and a PDMS micro-flow channel layer positioned on the glass substrate layer; the glass substrate layer comprises a glass substrate and a plurality of pairs of microelectrodes arranged on the glass substrate layer; the PDMS micro-flow channel layer comprises a plurality of independent micro-fluidic channels; the microelectrodes on the glass substrate are corresponding to the micro-flow channels on the PDMS micro-flow channel layer one by one; the microelectrodes are electrically connected with an external circuit. The use method comprises the steps of cell capture, cell tissue culture, electrical impedance spectroscopy detection and tissue release. The chip disclosed by the invention is processed by a transparent substrate, microscopic imaging can be taken as a supplementary means of the electrical impedance spectroscopydetection, and the dynamic growth and the physiological behavior of cell tissues and other biological processes are subjected to observation and in-situ analysis. The micro-flow control chip can be used in the fields of biological research, drug screening and the like of cells or tissues.
Owner:SOUTHEAST UNIV
Apparatus for use in determining a plurality of characteristics of a multiphase flow within a pipe
ActiveUS8429985B2Volume/mass flow by differential pressureIndirect mass flowmetersElectrical impedance spectroscopyPhase fraction
An apparatus for use in determining a plurality of characteristics of a multiphase flow within a pipe is disclosed. In one exemplary embodiment, the apparatus comprises first and second constrictions, a sheltered zone between the first and second constrictions, a sensing device coupled to an interior wall of the pipe, and a sheltered device coupled to the interior wall of the pipe and located within the sheltered zone. A first characteristic of the plurality of characteristics is determinable from data generated by the sensing device. A second characteristic of the plurality of characteristics is determinable from data generated by the sheltered device. In one exemplary embodiment, the first characteristic is a gas fraction, and the sensing device is a plurality of pressure sensors. In another exemplary embodiment, the second characteristic is a phase fraction, and the sheltered device is a plurality of electrical impedance spectroscopy (EIS) electrodes.
Owner:BAKER HUGHES INC
Method and device for skin moisture measurement
InactiveCN103271739AOvercoming frequencyOvercome errorDiagnostic recording/measuringSensorsHuman bodyElectric impedance spectroscopy
The invention relates to a method and device which achieves skin moisture measurement with the help of bioelectrical impedance spectroscopy, in particular to a method and device for the skin moisture measurement. According to the method and device for the skin moisture measurement, electrical impedance values of the skin on multiple frequency points are measured through electrodes contacted with the skin of the human body, measurement results are converted into a complex impedance spectroscopy curve graph, and the complex impedance spectroscopy curve graph is displayed on a display screen of an instrument. According to the smooth condition of an impedance spectroscopy curve, kernel parameters are given out, and corresponding skin moisture content is calculated according to the kernel parameters. The method can simultaneously provide the electrical impedance spectroscopy curve and the skin moisture content obtained through calculation for users. According to the method and device for the skin moisture measurement, the measurement range of the skin moisture content is made to be expanded to the condition that the skin is quite dry, and given results are more visual and more dependable.
Owner:TSINGHUA UNIV
Determining surface wetting of metal with changing well fluids
ActiveUS20140060819A1Electric/magnetic detection for well-loggingSurveyElectrical impedance spectroscopyMetallic materials
Methods and apparatuses for determining surface wetting of a metallic material with changing well fluids. In general, the methods according to the invention include measuring electrical impedance spectroscopy (“EIS”) for a system simulating downhole conditions for the wetting of a surface. Methods and apparatuses for making EIS measurements model double-layer capacitance at a downhole surface in a well, from which the nature and quantification of the wetting of the surface can be inferred.
Owner:HALLIBURTON ENERGY SERVICES INC
Determining surface wetting of rock with changing well fluids
InactiveUS8766641B2Electric/magnetic detection for well-loggingSurveyElectrical impedance spectroscopyDouble-layer capacitance
Methods and apparatuses for determining surface wetting of a rock material with changing well fluids. In general, the methods according to the invention include measuring electrical impedance spectroscopy (“EIS”) for a system simulating downhole conditions for the wetting of a surface. Methods and apparatuses for making EIS measurements model double-layer capacitance at a downhole surface in a well, from which the nature and quantification of the wetting of the surface can be inferred.
Owner:HALLIBURTON ENERGY SERVICES INC
Spectrographic material analysis using multi-frequency inductive sensing
A multi-frequency inductive sensing system can be used for spectrographic material analysis of a conductive target material (such as tissue) based on electrical impedance spectroscopy. An inductive sensor can be driven with an excitation current at multiple sensor excitation frequencies (ω) to project a time-varying magnetic field into a sensing area on the surface of the target material, inducing eddy currents within the target material. The inductive sensor can be characterized by a sensor impedance Z(ω) as a function of the sensor excitation frequency (ω), and the resulting induced eddy currents. Multiple sensor impedance Zs(ω) measurements, at the multiple sensor excitation frequencies (ω), can be determined, which represent electromagnetic properties of the target material (such as permittivity ε, permeability μ, and resistivity ρ), based on the induced eddy currents. The multiple sensor excitation frequencies (ω), and corresponding multiple sensor impedance Zs(ω) measurements, can be selected for particular target penetration depths.
Owner:TEXAS INSTR INC
Network boundary equivalence method for electromagnetic transient calculation of power grid
ActiveCN105160058ASolve boundary equivalence problemsVerify accuracySpecial data processing applicationsElectrical impedance spectroscopyPower grid
The invention discloses a network boundary equivalence method for electromagnetic transient calculation of a power grid. The method comprises the following steps: S1, a step of presetting a harmonic impedance observation bus; S2, a step of presetting an equivalent boundary; S3, a step of obtaining a harmonic admittance matrix basic parameter; S4, a step of preprocessing the basic parameter; S5, a step of forming a full-network harmonic admittance matrix; S6, a step of calculating harmonic impedance seen from the observation bus to the full network; S7, a step of performing Ward equivalence on the preset equivalent boundary; S8, a step of calculating harmonic impedance seen from the observation bus to a reserved sub-network after network simplification; S9, a step of comparing harmonic impedance by scanning a bus set before and after equivalence; and S10, a step of determining a final equivalence scheme. The method has the beneficial effects that the harmonic impedance seen from any bus to a system in a network is quickly obtained, and an equivalent result for reserving impedance spectrum characteristics of an original network and complete electric relations among boundary nodes is provided for electromagnetic transient calculation, so that the accuracy of simulation calculation is improved.
Owner:STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST +1
Alternating-current impedance spectrum acquisition method and apparatus, and related assembly
InactiveCN110806543ARealize online measurementLow costResistance/reactance/impedenceElectrical testingElectrical batteryHemt circuits
The application discloses an alternating-current impedance spectrum acquisition method applied to a BMS system of a battery. The BMS system comprises an equalization switch. The alternating-current impedance spectrum acquisition method comprises the steps that: when the BMS system is in an equalization on state, the switching frequency of the equalization switch is sequentially adjusted to a plurality of preset frequency values, so that alternating-current impedance test signals corresponding to the preset frequency values are provided for the battery; an alternating current impedance of the battery under each preset frequency value is obtained; and an alternating-current impedance spectrum of the battery is obtained based on all alternating-current impedances. According to the application, when the BMS system of the battery enables the equalization function, the alternating-current impedance test signal is provided for the battery by adjusting the switching frequency of the equalization switch in the equalization circuit, so that the online measurement of the alternating-current impedance spectrum is realized without any additionally designed alternating-current impedance test equipment and thus the hardware cost is saved. In addition, the invention also discloses an alternating-current impedance spectrum acquisition device, electronic equipment and a computer readable storagemedium, which have the above beneficial effects.
Owner:杭州华塑科技股份有限公司
Spectrographic material analysis using multi-frequency inductive sensing
A multi-frequency inductive sensing system can be used for spectrographic material analysis of a conductive target material (such as tissue) based on electrical impedance spectroscopy. An inductive sensor can be driven with an excitation current at multiple sensor excitation frequencies (ω) to project a time-varying magnetic field into a sensing area on the surface of the target material, inducing eddy currents within the target material. The inductive sensor can be characterized by a sensor impedance Z(ω) as a function of the sensor excitation frequency (ω), and the resulting induced eddy currents. Multiple sensor impedance Zs(ω) measurements, at the multiple sensor excitation frequencies (ω), can be determined, which represent electromagnetic properties of the target material (such as permittivity ε, permeability μ, and resistivity ρ), based on the induced eddy currents. The multiple sensor excitation frequencies (ω), and corresponding multiple sensor impedance Zs(ω) measurements, can be selected for particular target penetration depths.
Owner:TEXAS INSTR INC
Method for monitoring turn-to-turn short circuit of generator by impedance spectrum
InactiveCN110716152AImprove reliabilityImprove usabilityDynamo-electric machine testingCapacitanceFrequency spectrum
The invention relates to a method for monitoring a turn-to-turn short circuit of a generator by an impedance spectrum. The method comprises the following steps of 1, acquiring generator end current, coupling capacitance current in a closed bus of the generator and injection signal generator end voltage-to-ground; 2, inputting the acquired generator end current, the coupling capacitance current inthe closed bus of the generator and the injection signal generator end voltage-to-ground data to a parameter-adjustable generator low-frequency-high-frequency winding impedance parameter model to obtain the impedance spectrum during normal running and the turn-to-turn short circuit of the generator; and 3, drawing a spectrum-impedance winding coupling curve based on the impedance spectrum during the normal running and the turn-to-turn short circuit of the generator, and monitoring a turn-to-turn short circuit fault of a generator stator by the spectrum-impedance winding coupling curve. By themethod, the running reliability and the availability of the generator can be improved, and the turn-to-turn insulation monitoring of different insulation mediums is achieved by evaluating the insulation fault of the generator stator medium.
Owner:THERMAL POWER TECH RES INST OF CHINA DATANG CORP SCI & TECH RES INST
Dynamic multi-frequency electrical impedance tomography method based on impedance frequency spectrum constraint
ActiveCN109662712AImprove spatial resolutionImprove noise immunityDiagnostic recording/measuringSensorsFrequency spectrumRelational model
The invention belongs to the field of electrical impedance tomography, and particularly relates to a dynamic multi-frequency electrical impedance tomography method based on the impedance frequency spectrum constraint. The method includes the steps that 1, limited surface element dividing is carried out in an imaging region, the variety number of tissue in the imaging region and the frequency spectrum of each kind of tissue are determined, and a relation model of the volume fraction and the boundary voltage is established; 2, the boundary of the imaging region is excited through exciting currents at different frequencies, and boundary voltage data at different moments at each frequency is measured; 3, an inverse problem objective function is established according to the relation of the volume fraction change and the boundary voltage pressure obtained in the step 1 and solved, and the change value of the volume fraction in the imaging region is obtained; 4, the volume fraction change isconverted into the impedance change, the impedance change is shown in the imaging region through color levels, and an impedance change image is obtained. A novel scheme for relieving the inverse problem morbidity is provided on the aspect of increasing the observation data size, and then the space resolution and the anti-noise capacity of the reconstructed image are improved.
Owner:FOURTH MILITARY MEDICAL UNIVERSITY
Microneedle-based electrical impedance sensor to monitor plant water status in real time
ActiveUS20190369039A1Accurate placementAvoid irreversible damageMaterial impedanceTesting plants/treesElectrical impedance spectroscopyEngineering
Owner:NAT TECH & ENG SOLUTIONS OF SANDIA LLC +1
System and method for electrical impedance spectroscopy
ActiveUS9820669B2Sensitively assessHigh sensitivityElectroencephalographySensorsElectricityElectrical resistance and conductance
Systems and methods for determining brain health of a subject include or employ an electrical stimulator configured to apply a current to at least one pair of electrodes, and the electrodes are positioned on a skull of the subject to apply the current and to receive brain activity of the subject. The electrical stimulator is configured to apply a current having a waveform according to a Stochastic Gabor Function (SGF). A signal processor is configured to record the brain activity of the subject in the form of spectral electrical impedance data, and a computer system having non-transient computer readable media is programmed and configured to process the spectral electrical impedance data and indicate an impedance change within the brain of the subject.
Owner:THE GENERAL HOSPITAL CORP
Membrane pollution in-situ monitoring device based on Zeta potential and electrical impedance spectroscopy technology
InactiveCN108562635AEasy to operateImprove accuracySemi-permeable membranesColor/spectral properties measurementsFiberZeta potential
The invention discloses a membrane pollution in-situ monitoring device and method based on the Zeta potential and electrical impedance spectroscopy technology. The device comprises a top-free one-wallfiltering pond 1, a membrane fiber 2 is arranged in the middle of the filtering pond 1, and a first Ag / AgCl electrode 3 and a second Ag / AgCl electrode 4 are arranged on a feeding side and a water outlet side of the filtering pond 1 respectively; the first Ag / AgCl electrode 3 and the second Ag / AgCl electrode 4 are connected to a data collecting card 11 through wires, and recording of the flowing potential is achieved through a computer 13; a linear platinum electrode 5 is arranged in a pipeline in the middle of the filtering pond 1, an annular tantalum electrode 6 surrounds the outside the membrane fiber 2, and the linear platinum electrode 5 and the annular tantalum electrode 6 are connected with an electrochemical workstation 10 through wires; signals are transmitted through the computer13; the cross-membrane pressure difference of the membrane fiber 2 is recorded through a pressure sensor 7, and the data is recorded on a paper-free recorder 9. According to the device, the in-situ online membrane pollution stage evaluation can be achieved, the cleaning time is determined, the operation is simple, the sensitivity is high, and industrialization is easy.
Owner:TIANJIN POLYTECHNIC UNIV
Method for detecting lysozyme
ActiveCN106959323AWill not interfere with detectionImprove accuracyMaterial resistanceMaterial electrochemical variablesElectrical resistance and conductanceElectrical impedance spectroscopy
The invention provides a method for detecting lysozyme. The method comprises the following steps of dispensing a metal organic skeleton solution to the surface of a gold electrode, carrying out incubating, washing and nitrogen drying; dispensing a lysozyme aptamer solution to the surface of the gold electrode, carrying out incubating, washing and nitrogen drying and carrying out first electrochemical impedance spectroscopy detection; washing the gold electrode after first electrochemical impedance spectroscopy detection, carrying out nitrogen drying, dispensing the solution to a to-be-detected sample, carrying out incubating, washing and nitrogen drying, and carrying out second electrochemical impedance spectroscopy detection; subtracting electron transfer resistance in a first electrical impedance spectroscopy from the electron transfer resistance in a impedance spectroscopy of the to-be-detected sample to obtain an electron transfer resistance difference and comparing with a default standard curve to obtain the concentration of the lysozyme. According to the embodiment of the invention, the adopted detection method is simple in operation, marking is not needed, the flexibility is relatively high, the detection limit can reach 2.0*10<-11>mol / L and the linear range is 1.0*10<-7>mol / L to 1.0*10<-11>mol / L.
Owner:LINYI UNIVERSITY
Method and device for detecting impedance spectrum of easily-made drug chemicals
ActiveCN106680331AImprove adaptabilitySimple methodMaterial resistanceFrequency spectrumData acquisition
The invention provides a method and a device for detecting impedance spectrum of easily-made drug chemicals. The method comprises the following steps: generating sine waves of different frequencies through the control of a single chip microcomputer by virtue of a digital frequency synthesis technique; generating corresponding constant potentials from sine waves of the different frequencies by virtue of a constant potential rectifier, and loading the constant potentials to a counter electrode of a detection electrode; generating an alternating electric field in measured liquid by virtue of the detection electrode, so as to form current; feeding the current back to the constant potential rectifier by virtue of a working electrode of the detection electrode, amplifying the current, and carrying out impedance and phase detection; inputting detected signals into the single chip microcomputer, so as to finish the data collection of a sample; and making comparison between the impedance and phase data of the measured sample under different frequencies and a standard atlas database, so as to obtain a detection result. A convenient and rapid method is provided for the detection of the easily-made drug chemicals. The method has the beneficial effects that the implementation is convenient, the requirements on a tester is low, no reagent is used, the device is small in volume, light and simple to operate, the tracking is realized, and specialist data is updated in real time; and the method has very good adaptability to novel medicines.
Owner:NORTHEAST NORMAL UNIVERSITY +1
System and method for beamforming in soft-field tomography
ActiveUS20130109962A1Computerised tomographsDiagnostic recording/measuringProperty distributionElectrical resistance and conductance
A system and method for beamforming in soft-field tomography are provided. One soft-field tomography system includes a plurality of transducers configured for positioning proximate a surface of an object and one or more excitation drivers coupled to the plurality of transducers and configured to generate excitation signals for the plurality of transducers. The excitation signals include at least one frequency component. The soft-field tomography system further includes one or more response detectors coupled to the plurality of transducers and configured to measure a response of the object at the plurality of transducers to the excitation applied by the plurality of transducers based on the excitation signals. The soft-field tomography system also includes a soft-field reconstruction module configured to reconstruct a property distribution based on the excitation signals and the measured response using an Electrical Impedance Spectroscopy (EIS) beamformer.
Owner:GENERAL ELECTRIC CO
Apparatus and methods for determining surface wetting of material under subterranean wellbore conditions
Methods and apparatuses for determining surface wetting of metallic materials at downhole wellbore condition with fixed or changing well fluids are disclosed. In general, the methods according to the disclosure include carrying out an electrical impedance spectroscopy (“EIS”) for a system simulating downhole conditions for the wetting of a surface by simultaneously dynamically moving electrodes exposed to the well fluid while measuring the changes in electrical characteristics between the electrodes.
Owner:HALLIBURTON ENERGY SERVICES INC
Micro-fluidic chip for monitoring movement behaviors and physiological characteristics of nematodes
ActiveCN111735852AAchieve trainingFully automatedLaboratory glasswaresMaterial resistanceElectric impedance spectroscopyElectrical impedance spectroscopy
Owner:SOUTHEAST UNIV
Electrical impedance method for measuring soluble sugar content in catalpa bungei stem leaf and cold resistance of catalpa bungei
InactiveCN105806894ARapid diagnosisReal-time diagnosisMaterial impedanceElectrical impedance spectroscopySugar
The present invention provides an electrical impedance method for measuring soluble sugar content in catalpa bungei stem leaf. The method comprises the steps of: detecting an electrical impedance spectroscopy of a catalpa bungei stem leaf sample to be tested; according to the electrical impedance spectroscopy of the sample to be tested, determining an appropriate equivalent circuit; according to the equivalent circuit, fitting the data of the electrical impedance spectroscopy of the sample to be tested to obtain electrical impedance parameters of the sample to be tested; and according to a regression model of the predetermined electrical impedance parameters of the catalpa bungei stem leaf with soluble sugar content, and the electrical impedance parameters of the sample to be tested, acquiring the soluble sugar content of the catalpa bungei stem leaf. The method provided by the invention establishes a regression model of the electrical impedance parameters and soluble sugar content of the catalpa bungei stem leaf, thus calculating the soluble sugar content of the catalpa bungei stem leaf based on the measured impedance parameters. The method can realize fast real-time diagnosis of the soluble sugar content and can obtain the cold resistance of the catalpa bungei stem leaf through the Logistic equation.
Owner:HEBEI AGRICULTURAL UNIV.
Analysis processing method using impedance spectrum data, impedance spectrum data analysis processing system, and impedance spectral analysis processing program
PendingUS20210293867A1Reproduce the measured impedance spectrum dataImprove accuracyProtecting/adjusting hybrid/EDL capacitorResistance/reactance/impedenceElectrical impedance spectroscopyFrequency spectrum
This method for analysis processing by using measured impedance spectrum data includes: a step for determining whether to reset the maximum value and / or the minimum value of logarithmic relaxation time corresponding to a measured logarithmic frequency on the basis of the measured impedance spectrum data; a step for setting the number of equal-interval divisions within the range of the logarithmic relaxation time set in the determination step; and a step for analyzing parameters R∞, T, L, and Rl for the range of the set logarithmic relaxation time so as to satisfy a prescribed expression (A) by applying a regularized least-squares method.
Owner:NAT INST FOR MATERIALS SCI
Method and device for determining reason of high-frequency oscillation of wind power plant
ActiveCN114256859ALocate the cause of high frequency oscillationRefined high-frequency oscillation determinationGeometric CADSingle network parallel feeding arrangementsFrequency spectrumElectrical impedance spectroscopy
The invention discloses a method and a device for determining high-frequency oscillation reasons of a wind power plant, and the method comprises the steps: building a sweep frequency simulation model corresponding to each piece of oscillation equipment according to the obtained actual equipment parameters of each piece of oscillation equipment in the wind power plant, and determining the sweep frequency impedance characteristics corresponding to each piece of oscillation equipment in a small signal analysis mode; determining an electrical node network according to the obtained topological structure diagram of the wind power plant; according to a preset equipment combination mode, the electrical node network and the sweep frequency impedance characteristic, determining an impedance spectrogram corresponding to each piece of oscillation equipment in the preset equipment combination mode by utilizing a node impedance aggregation calculation mode; and determining the reason of high-frequency oscillation in the wind farm according to the impedance spectrogram. According to the method, the internal equipment of the wind power plant is subjected to refined modeling, the whole wind power plant and the internal equipment individuals are analyzed, high-frequency oscillation determination under the condition of multiple equipment and multiple factors is completed in a refined mode, and the reason of high-frequency oscillation of the internal equipment of the wind power plant is more comprehensively positioned.
Owner:NORTH CHINA ELECTRICAL POWER RES INST +2
Method and device for calculating mechanical quality factor of piezoelectric ceramic ring
ActiveCN111310399ASimple calculationImprove computing efficiencyResourcesComputer aided designFrequency spectrumElectrical impedance spectroscopy
The invention discloses a method and a device for calculating a mechanical quality factor of a piezoelectric ceramic ring. The method comprises the following steps: establishing a loss-containing decoupling equivalent circuit model of the piezoelectric ceramic ring; performing simulation calculation on the equivalent circuit model to obtain an impedance-frequency characteristic curve; and calculating the mechanical quality factor of the piezoelectric ceramic ring under the resonance frequency and the anti-resonance frequency through the impedance spectrum. The method is based on a loss-containing decoupling equivalent circuit model. According to the method, the piezoelectric ceramic ring in the radial vibration mode is subjected to simulation analysis, the mechanical quality factor of thepiezoelectric ceramic ring under the resonance frequency and the anti-resonance frequency is obtained through calculation, the calculation process is simple, the calculation efficiency is high, and the mechanical quality factor of the piezoelectric ceramic ring can be accurately estimated.
Owner:HOHAI UNIV
Apparatus for use in determining a plurality of characteristics of a multiphase flow within a pipe
ActiveUS20120048030A1Volume/mass flow by differential pressureIndirect mass flowmetersElectrical impedance spectroscopyEngineering
An apparatus for use in determining a plurality of characteristics of a multiphase flow within a pipe is disclosed. In one exemplary embodiment, the apparatus comprises first and second constrictions, a sheltered zone between the first and second constrictions, a sensing device coupled to an interior wall of the pipe, and a sheltered device coupled to the interior wall of the pipe and located within the sheltered zone. A first characteristic of the plurality of characteristics is determinable from data generated by the sensing device. A second characteristic of the plurality of characteristics is determinable from data generated by the sheltered device. In one exemplary embodiment, the first characteristic is a gas fraction, and the sensing device is a plurality of pressure sensors. In another exemplary embodiment, the second characteristic is a phase fraction, and the sheltered device is a plurality of electrical impedance spectroscopy (EIS) electrodes.
Owner:BAKER HUGHES INC
Acoustic evaluation method for harp resonator based on impedance technology, and experiment device
InactiveCN107436183ASimple structureReasonable designAnalysing solids using sonic/ultrasonic/infrasonic wavesSubsonic/sonic/ultrasonic wave measurementImpedance analyzerLow-pitched
The invention discloses an acoustic evaluation method and experimental device for a harp resonance box based on impedance technology, and is characterized in that: the experimental device includes an impedance analyzer, a harp resonance box, a first piezoelectric sensor, and a second piezoelectric sensor , the third piezoelectric sensor, the fourth piezoelectric sensor, a computer and its software processing system, the acoustic evaluation method and experimental device of the present invention, without the need for the player to play the harp, directly use the impedance analyzer to test the harp resonance box in the middle range. , high-pitched zone 1, high-pitched zone 2, and super high-pitched zone are scanned to test the impedance spectrum of the harp resonance box within the scanning frequency range, and then judge the pros and cons of the harp resonance box according to the impedance spectrum of the harp resonance box . The invention has simple structure and reasonable design, overcomes the artificial factors in evaluating the timbre of the harp in the traditional method, objectively evaluates the quality of the timbre of the harp resonance box, and provides a brand-new harp evaluation method for harp manufacturers.
Owner:ANHUI UNIV OF SCI & TECH
Microneedle-based electrical impedance sensor to monitor plant water status in real time
ActiveUS11060989B2Accurate placementAvoid irreversible damageTesting plants/treesMaterial impedanceElectrical impedance spectroscopyPlant tissue
Owner:NAT TECH & ENG SOLUTIONS OF SANDIA LLC +1
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