1248results about "Material impedance" patented technology

Systems and methods are provided herein for transporting a biological sample. Systems and methods provided herein also include providing electrical monitoring of the donor tissue to track electrical activity during transportation. A potential QRS-like wave can be detected even in resting heart tissue to determine viability.

Systems and methods are provided herein for monitoring electrical activity in ex vivo, resting donor organs. Systems and methods provided herein also include providing electrical stimulation to the donor tissue to maintain or increase viability during storage or transport. Donor organs can include ex vivo, resting hearts. Electrical activity can be used to determine donor organ viability, especially in instances where visual evaluation of a beating heart is not possible. The same electrodes or other sensing devices used to measure electrical activity can be used to apply a voltage / current to the tissue as well in order to maintain viability of the organ. In some embodiments, stimulation or depression may be provided in response to the measured electrical activity.

The invention discloses a radiator salt spray corrosion life prediction method based on dynamic time warping, which belongs to the technical field of material corrosion test and life prediction, and comprises the following steps: collecting time sequence data of surface impedance and thermal resistance change of a radiator, constructing a dual-channel corrosion characteristic data set, and recording a salt spray concentration data value. The temperature data value and the humidity data value are combined, and an environment sensitivity weight vector is established. Accelerated corrosion in a salt spray environment is simulated, a laboratory accelerated corrosion test spectrum is generated, meanwhile, an actual environment fluctuation spectrum is monitored, the two spectrums are aligned by using a weight vector, accelerated corrosion data are obtained, and a basic life prediction value is calculated. And calculating an environment-structure coupling factor by combining the interaction between the three-dimensional structure characteristic parameters of the radiator and the temperature and humidity data values, correcting the basic life prediction value, and generating a final life prediction result. According to the method, double-channel feature alignment and coupling factor correction are adopted, and the corrosion life of the radiator of the specific structure under the actual working condition can be predicted.

The invention relates to an agricultural biomass characteristic intelligent detection method, system and device based on multi-frequency conductance coupling and a medium, and the method comprises the following steps: applying an electric excitation signal to an agricultural biomass sample, and synchronously collecting multi-physics coupling response data; based on the multi-physics field coupling response data, constructing a multi-scale equivalent circuit model comprising a resonance unit, a constant phase unit and a diffusion impedance unit; synchronously optimizing a resonance unit parameter, a constant phase unit parameter and an impedance unit parameter of the multi-scale equivalent circuit model through a Bayesian joint inversion algorithm to obtain an optimal parameter combination; and according to the optimal parameter combination, calculating a preliminary detection result of biomass components containing cellulose crystallinity, lignin crosslinking degree and water content, combining the collected environment temperature and humidity sensing data to implement dynamic compensation, and outputting a final detection result. Therefore, the detection precision, the environment robustness and the operation reliability are synergistically improved in three aspects of hardware design, model construction and algorithm optimization.

An automatic temperature compensation method and apparatus, and a storage medium. The method comprises: acquiring an impedance information set of at least one position on an object under test; on the basis of a first impedance signal, n preset offsets and a pre-acquired reference signal, determining n error values corresponding to the first impedance signal; on the basis of the n error values and a preset standard, determining a final error value, such that different offsets corresponding to different temperature changes can be determined, so as to determine an accurate final compensation value for the current object under test; on the basis of an offset and the first impedance signal, determining a horizontally compensated impedance signal, so as to complete the compensation for an impedance signal in the horizontal aspect; and on the basis of the reference signal, the horizontally compensated impedance signal and a temperature deviation coefficient, determining a vertically compensated impedance signal.

Apparatus for real time water content and water cement monitoring on a ready-mix concrete truck includes at least one real time moisture measurement module or sensor configured tosense continuous real time moisture measurements of a batch of wet cement loaded into a rotating drum of a ready-mix concrete truck; andprovide signaling containing information about the continuous real time moisture measurements sensed.The apparatus may include either a hatch door of the rotating drum of the ready-mix concrete truck, or the rotating drum of the ready-mix concrete truck, or the ready-mix concrete truck itself.

The invention relates to the technical field of material detection, in particular to a silver coating adhesive force detection method based on multi-frequency impedance imaging, which comprises the following steps: applying a dual-mode multi-frequency excitation signal to the surface of a silver coating through an attached microelectrode array, synchronously acquiring voltage-current response data, and generating a dual-mode multi-frequency impedance original data set; performing time-varying impedance phase-locked separation on the dual-mode multi-frequency impedance original data set, extracting a dynamic impedance component of a coating-matrix interface region, and reconstructing a three-dimensional sub-interface impedance distribution diagram; and outputting an adhesive force quantized value through an oscillation frequency-adhesive force conversion model according to the spatial oscillation frequency characteristics of the impedance phase in the three-dimensional sub-interface impedance distribution diagram. According to the invention, a double-phase-locked loop system is adopted to realize the time-varying component demodulation of the impedance response of the silver coating-matrix interface, the low-frequency dynamic impedance signal modulated by silver ion migration is effectively extracted, and the weak change of the interface bonding state is sensitively reflected.

The invention discloses a method for testing a polyurethane thermal insulation layer of a new energy automobile battery pack. The method comprises the following steps: simulating the operation condition of the battery pack, constructing a scenarized digital environment, and obtaining multi-condition multi-band data; arranging a virtual electrode array based on the data, applying an alternating current signal and collecting electrical information such as impedance and phase; and a three-dimensional impedance distribution map is generated through iterative inversion by combining a multi-physics field coupling model, and the defects of the polyurethane thermal insulation layer are identified and evaluated. According to the technical scheme, under the real working conditions of high and low temperature, fast charging, discharging and the like, the potential problems of cracks, delamination, bubbles and the like in the heat insulation layer can be accurately positioned, and the safety and the heat management efficiency of the new energy automobile battery pack are improved.

The invention discloses a high-precision liquid phase chip sample positioning and identification system, which belongs to the field of high-precision liquid phase chip sample positioning and identification, and comprises an active liquid phase sample positioning control module used for collecting a liquid flow state signal and adjusting the speed and position of an input sample in real time through an adjustable microfluid structure, fixed-point residence and directional conveying of samples in a chip channel are realized; the image recognition and feature position fine adjustment module is used for carrying out multi-modal image collection on an area where the sample is located, extracting spatial feature information of the target sample based on a deep learning recognition model, and carrying out fine adjustment correction on the position of the sample according to a feedback signal; by constructing an active liquid phase sample positioning and recognition system, high-precision directional control and spatial residence of a liquid sample in a chip channel are realized, the problems of sample drift and unstable recognition in a traditional passive conveying mode are effectively avoided, and the timeliness and accuracy of sample recognition are improved.

The invention discloses an automatic conductive ink screen printing quality detection method based on a big data model. The method comprises the following steps: acquiring hyperspectral image data, three-dimensional shape data and real-time impedance distribution data of a conductive ink screen printing layer; performing local outlier factor optimization processing on the hyperspectral image data, and extracting a pixel-level spectral feature vector; performing vertical weight function Gaussian regression filtering on the three-dimensional shape data to generate a topological smooth curved surface coordinate set; optimizing the real-time impedance distribution data based on the conductivity distribution matrix, and outputting a noise reduction conductivity matrix; constructing an association graph and a node feature tensor based on the detection key points, and generating silk-screen multi-modal data; through modal interaction, features are extracted in stages, and cross-modal joint features are extracted through multi-stage joint clustering optimization; and a task space separation head module is input, and a quality evaluation result is output through classification and regression branches. According to the method, multi-modal data deep fusion, noise robustness improvement, cross-modal feature accurate extraction and efficient real-time detection are realized.

The invention discloses a square lithium ion battery external insulation damage detection method, system, medium and equipment, and the method comprises the steps: carrying out the electrochemical impedance spectrum measurement of a square battery with an external insulation state to be detected, and obtaining an electrochemical impedance spectrum; building an equivalent circuit based on the electrochemical impedance spectrum to obtain each characterization electrical element parameter in the equivalent circuit; high-frequency insulation resistance and interface capacitance in the equivalent circuit are extracted, and the damage condition of the outer insulation film of the square lithium ion battery is detected through parameter differences.

The invention belongs to the technical field of soil research equipment, and aims to solve the problem of measurement errors when a time domain reflection device is used for measuring the ice content of soil. The invention provides a method and a device for testing the ice content of a soil body based on an electrochemical impedance modulus value. The method comprises the following steps: setting test parameters of the ice content of the soil body through an electronic computer; a temperature control device is used for adjusting and controlling test conditions of the soil body sample, and a control module drives the temperature control device to perform stepped cooling on the soil body sample; applying a disturbance signal to the soil body sample through the test module, and synchronously collecting a response signal sent by the soil body sample; calculating an experimental value of an electrochemical impedance module value by using electrochemical impedance data analysis software, fitting by combining with the temperature signal to obtain a fitting value of the electrochemical impedance module value, and substituting the value and the initial water content into a soil mass ice content calculation model to obtain the ice content of the soil mass sample. According to the invention, the ice content of the soil body can be rapidly and accurately calculated based on the chemical-electrochemical impedance modulus value.

The invention relates to the technical field of concrete detection, in particular to a concrete protective layer void detection method and system based on a detachable piezoelectric ceramic sensor and an electromechanical impedance resonance technology. The detection method comprises the following steps: temporarily fixing a detachable piezoelectric ceramic sensor on a detection point on the surface of a concrete structure; applying an alternating-current sweep-frequency voltage to excite the piezoelectric ceramic sensor, and obtaining an electromechanical impedance signal frequency spectrum; the electromechanical impedance signal frequency spectrum is analyzed, the frequency of a local defect formant is obtained, and according to the frequency of the local defect formant, geometric parameters of a void area are estimated through a defect size and frequency relation model; and moving the sensor and repeatedly detecting other detection points. The detection method has high efficiency and flexibility, and detection can be realized in any environment; the single-point detection speed is high, the efficiency is high, baseline data is not needed for detection, the anti-interference performance is high, and rapid positioning and quantitative evaluation of void damage can be achieved.

A wireless power transmitter that transmits power to a wireless power receiver, the wireless power transmitter including a communication unit configured to communicate with the wireless power receiver; and a controller, wherein the communication unit receives a plurality of packets including a foreign object detection (FOD) status packet from the wireless power receiver, wherein the controller determines whether a foreign object is present in a charging area of the wireless power transmitter on the basis of the FOD status packet, wherein the communication unit transmits, to the wireless power receiver, a response signal indicating whether the foreign object is present in the charging area of the wireless power transmitter on the basis of a result of the determination, wherein the response signal is determined using a measured peak frequency of a power signal transmitted by the wireless power transmitter and a reference peak frequency included in the FOD status packet received from the wireless power receiver, and wherein the plurality of packets further include at least one of a signal strength packet, an end power transfer packet, a power control hold-off packet, a configuration packet, an identification packet for transmitting receiver identification information, an extended identification packet, a general request packet, a special request packet, a control error packet, a renegotiation packet, a 24-bit received power packet, an eight-bit received power packet, and a charging status packet.

Disclosed herein are methods and systems for identifying target analytes such as H2S and CO2 during downhole fluid analysis. The systems may include a fluid sampling tool comprising at least one probe to fluidly connect the fluid sampling tool to a formation in a wellbore, at least one passageway that passes through the at least one probe and into the fluid sampling tool, a sensor section comprising a measurement region in fluid communication with the at least one passageway, and a thin film deposited on the measurement region, wherein the thin film changes at least one of its physical properties upon exposure to the target analyte found in the at least one passageway. The methods may include disposing the fluid sampling tool into a wellbore, drawing a formation fluid from a sampling zone, and passing the fluid sample over the thin film deposited on a measurement region.

A method of monitoring a condition prevailing inside a piping system with respect to an impairment due to accretion, abrasion or corrosion caused by fluid(s) flowing through the piping system is disclosed, comprising the steps of: installing at least two measurement devices susceptible to an impairment and configured to measure variables indicative of the impairment; wherein the measured variables include at least two variables exhibiting a different dependency on the impairment; continuously recording data including time series of measured values of the variables measured; based on training data included in the data determining a dynamic reference behavior of the variables corresponding to time dependent distributions of values of the variables to be expected of the measured values when the measurement devices are unimpaired; repeatedly determining a deviation between a monitored behavior of the measured values of the variables and the reference behavior.

The invention relates to the technical field of batteries, and discloses a method for detecting local electrolyte concentration and conductivity in a battery, which comprises the following steps: providing a test battery, the test battery comprises a battery body and a microelectrode positioned at a to-be-detected part in the battery body, and the volume ratio of the electrode of the battery body to the microelectrode is at least 100: 1; the surface of each microelectrode is provided with a pore structure capable of allowing electrolyte to enter; and testing the concentration and the conductivity of the electrolyte entering the pore structure by adopting an impedance spectroscopy detection method, or testing the concentration and the conductivity of the electrolyte entering the pore structure by adopting a single-point frequency testing method. According to the method, the local electrolyte can be detected, the uniformity of the electrolyte in the battery can be known, and the change of the conductivity of the electrolyte of the battery can also be known; the method can be used for knowing the electrolyte impedance change trend and the lithium salt consumption condition in the battery aging process. According to the method, the battery is not disassembled, and the test process is simple and efficient.

A multi-modal nanopore system for biosensing and sequencing. In some embodiments, the system includes a first nanopore device, the first nanopore device including: a first chamber and a second chamber in a planar substrate; a nano-fluidic channel connecting the first chamber and the second chamber; a first electrode and a second electrode forming a nanopore between the first electrode and the second electrode; an optical coupling element configured to couple an electromagnetic beam with the nanopore; a first bias circuit for applying a bias to the first electrode and the second electrode, to form a transverse electric field in the nanopore; and a current-measuring circuit configured to measure a current between the first electrode and the second electrode.

Disclosed herein is a sensors-as-a-service ecosystem. In use, the system includes functions for receiving first sensor data at a sensors as a service platform, where the first sensor data corresponds to a first level of capabilities for a first sensor. The system also receives a selection of a sensor upgrade for the first sensor and provisions enhanced sensor capabilities for the sensor upgrade based on the selection. Furthermore, the system sends a sensor update with the enhanced sensor capabilities from the sensors as a service platform to the first sensor. Finally, the system receives second sensor data from the first sensor at the sensors as a service platform, where the second sensor data corresponds to a second level of capabilities for the first sensor.

The invention discloses an electric hot melting sleeve connection monitoring method for a polyurethane directly-buried thermal insulation pipe, and belongs to the technical field of electric hot melting sleeve installation monitoring. The method specifically comprises the steps that distributed electrode sets are embedded into annular contact surfaces on the two sides of an electric hot melting sleeve, and an electric coupling network is formed by the distributed electrode sets and a conductive enhancing structure in a polyurethane thermal insulation layer; during electrifying and heating, applying a broadband alternating current signal which is dynamically modulated and covers a dielectric relaxation frequency band of a melting interface to the electrode group; collecting electrode pair voltage response signals in real time, and resolving a complex impedance spectrum containing real part and imaginary part impedance components; analyzing real part impedance non-linear attenuation characteristics, and if the real part impedance non-linear attenuation characteristics do not accord with a rule, analyzing an imaginary part impedance phase angle fluctuation rule, extracting dielectric anomaly features, matching the dielectric anomaly features with a preset model, and performing early warning if the dielectric anomaly features exceed a tolerance range; and finally, positioning the spatial distribution of the fusion defects based on the impedance response of the electrode group.

A system for detecting mechanically damaged energy storage devices comprises an analyzer, a battery electrically connected to the analyzer, and a computing system communicatively connected to the analyzer and / or battery. A method for detecting mechanically damaged energy storage devices comprises applying an input at a range of frequencies to an energy storage device, measuring an output from the energy storage device, performing Electrochemical Impedance Spectroscopy (EIS) with Dynamic Relaxation Time (DRT) to calculate an impedance spectrum of the energy storage device, and modeling the energy storage device based on the impedance spectrum to identify if the energy storage device is mechanically damaged.

A wireless power receiver that receives power from a wireless power transmitter, the wireless power receiver including a communication unit configured to communicate with the wireless power transmitter; and a main controller, wherein the main controller generates a plurality of packets including a foreign object detection (FOD) status packet, wherein the communication unit transmits the FOD status packet to the wireless power transmitter, and the communication unit receives, from the wireless power transmitter, a response signal indicating whether a foreign object is present in a charging area of the wireless power transmitter, wherein the response signal is determined using a measured peak frequency of a power signal transmitted by the wireless power transmitter and a reference peak frequency included in the FOD status packet received from the wireless power receiver, and wherein the plurality of packets further include at least one of a signal strength packet, an end power transfer packet, a power control hold-off packet, a configuration packet, an identification packet for transmitting receiver identification information, an extended identification packet, a general request packet, a special request packet, a control error packet, a renegotiation packet, a 24-bit received power packet, an eight-bit received power packet, and a charging status packet.

To properly evaluate the characteristics of powder.SOLUTION: A measurement device 100 includes a die 30 provided with an accommodation hole 31a in which a powder P is accommodated, a pair of electrodes 40a and 40b that are inserted into the accommodation hole 31a and sandwich the powder P, a pressurizing unit 50 that applies a high-load pressurizing force for compressing the powder P to the pair of electrodes 40a and 40b, and a measurement unit 60 that applies an AC signal to the pair of electrodes and measures an impedance of the powder P. Each of the pair of electrodes 40a and 40b includes a plate-shaped flange portion 41a and 41b that have a cross-sectional area larger than a cross-sectional area of the accommodation hole 31a, and a boss portion 42a and 42b protruded from the flange portion 41a and 41b and inserted into the accommodation hole 31a.SELECTED DRAWING: Figure 1

Disclosed herein is a sensors-as-a-service ecosystem. In use, the system includes functions for receiving first sensor data at a sensors as a service platform, where the first sensor data corresponds to a first level of capabilities for a first sensor. The system also receives a selection of a sensor upgrade for the first sensor and provisions enhanced sensor capabilities for the sensor upgrade based on the selection. Furthermore, the system sends a sensor update with the enhanced sensor capabilities from the sensors as a service platform to the first sensor. Finally, the system receives second sensor data from the first sensor at the sensors as a service platform, where the second sensor data corresponds to a second level of capabilities for the first sensor.

The present disclosure provides a method for detecting a foreign object placed in a charging area of a wireless power transmitter and a wireless power transmitter. The method includes transmitting, by the wireless power transmitter, a power signal having a predetermined strength; measuring, via a controller, a peak frequency of the power signal; receiving, from a wireless power receiver, a data packet including a mode bit field, the mode bit field indicating whether the data packet includes a reference peak frequency of the wireless power receiver, wherein the reference peak frequency is pre-assigned to the wireless power receiver; in response to the mode bit field indicating that the data packet includes the reference peak frequency, determining, via the controller, an adaptive threshold frequency adjusted based on the reference peak frequency; and determining, via the controller, whether a foreign object is present in the charging area based on a comparison of the measured peak frequency of the power signal and the determined threshold frequency.

Systems and methods for monitoring conductivity of a fluid comprising generating a first measurement indicative of the conductivity of the fluid, determining whether a value of the first measurement is within the first calibration range, responsive to determining that the value of the first measurement is not within the first calibration range, calibrating the conductivity sensor with a second calibration range that includes the value of the first measurement, generating a second measurement indicative of the conductivity of the fluid.

The invention discloses a test device and method for in-situ monitoring of hydrates by using thermal-electric coupling, and belongs to the technical field of experiments for simulating generation and decomposition of hydrates in laboratories. The device comprises a hydrate synthesis and decomposition system, a temperature control system, a pressure control system, a thermal-electric parameter measurement system, a gas collection system and a data acquisition and user monitoring system, wherein a multi-point temperature sensor, a resistivity measurement probe and a heat conductivity coefficient measurement probe are arranged in a reaction kettle cavity; in-situ and real-time monitoring of multiple physical property parameters such as temperature distribution, resistivity change and heat conductivity coefficient in the whole process of generation and decomposition of the hydrate sample can be realized. According to the invention, thermal-electric coupling monitoring can be realized under high-pressure and low-temperature conditions, and a high-precision means is provided for hydrate formation mechanism research and exploitation processes.

Systems and methods for concurrent multi-frequency impedance measurements to characterize a substance of interest (e.g., analyte concentration) are disclosed herein. Generally, in some variations a method for characterizing a substance includes generating an input signal having a first set of frequency components across a plurality of frequencies, exciting an electrode arrangement with the input signal wherein the electrode arrangement is in contact with the substance. receiving an output signal from the excited electrode arrangement, the output signal having a second set of frequency components across the plurality of frequencies, determining an impedance signature of the substance across the plurality of frequencies, based on the first and second sets of frequency components, and characterizing the substance based on the impedance signature.

The invention relates to the technical field of circuit board detection, in particular to a printed circuit board drilling quality detection method and device, and the method comprises the steps: injecting sinusoidal current signals with preset frequencies into a plurality of test points of a to-be-detected drilling region of a printed circuit board, extracting impedance values under each frequency component, and calculating the drilling quality of the printed circuit board; constructing an equivalent impedance spectrum containing a real part and an imaginary part according to the impedance value; according to the interlayer structure and the equivalent impedance spectrum of the printed circuit board, calculating equivalent resistance and equivalent capacitance of the drilling area to be measured to form a characteristic parameter set; comparing the data of each grid point in the characteristic parameter set with a preset threshold value, and integrating the grid points exceeding the preset threshold value to generate a defect state mark; and performing electrical topology constraint on the defect state mark to generate a defect positioning result. According to the invention, hidden defects in the drill hole and interlayer structures can be deeply detected, the electrical performance of the drill hole can be comprehensively evaluated, and accurate defect positioning and state marking can be provided.

In a method for measuring the state of a film between a first member and a second member lubricated by a lubricant, impedance is measured by applying a predetermined voltage to the first member and the second member, and the measured impedance is fitted on the basis of equivalent circuits corresponding to each of a plurality of layers formed between the first member and the second member. Thereby, the impedance of each of the plurality of layers between the first member and the second member is derived, and the film state between the first member and the second member is measured on the basis of the derived impedance.