9 results about "Electrical impedance spectroscopy" patented technology

The application provides a method for detecting the quality of a hot plate of a plasma deposition device. The hot plate is arranged in a shell, the shell is grounded, and the hot plate has a metal line arranged inside. The metal line is part of a radio frequency line of the plasma deposition device. The method comprises: constructing a first measurement loop, the first measurement loop comprising a measurement line and a first measured line, wherein the first measured line comprises the metal line and the shell, the metal line and the shell form a first plate capacitor, the measurement line is used to output voltage signals of different frequencies and feedback impedance spectra at the different frequencies; measuring a first impedance spectrum of the first plate capacitor by using the measurement line; and determining whether the metal line of the hot plate is normal according to the first impedance spectrum.

This application provides a method for detecting the quality of a hot plate in a plasma deposition apparatus. The hot plate is disposed within a housing, which is grounded. The hot plate contains metal wiring, which is part of the radio frequency (RF) circuitry of the plasma deposition apparatus. The method includes: constructing a first measurement circuit, which includes a measurement circuit and a first circuit under test, wherein the first circuit under test includes the metal wiring and the housing, the metal wiring and the housing forming a first parallel-plate capacitor; the measurement circuit outputs voltage signals at different frequencies and feeds back impedance spectra at the different frequencies; measuring the first impedance spectrum of the first parallel-plate capacitor using the measurement circuit; and determining whether the metal wiring of the hot plate is normal based on the first impedance spectrum.

This invention provides a comprehensive evaluation method for the mid-frequency performance of a filter field grounding system, belonging to the field of power grid equipment technology. The invention extracts the resonant frequency distribution by inputting a wideband impedance spectrum into an artificial intelligence frequency domain response identification model based on a coarse spatiotemporal attention mechanism. It then dynamically adjusts the spatial receptive field parameters according to the resonant frequency offset function. A three-dimensional electromagnetic field simulation model is established based on soil frequency domain parameters, and the ground potential and current density distribution are calculated using the radial basis function collocation method and the fast multipole algorithm. The entropy value of current distribution uniformity and the Gini coefficient are calculated to identify current concentration areas and assess local overheating risk. Finally, the analytic hierarchy process (AHP) is used to dynamically weight and comprehensively score indicators such as impedance peak value, resonant frequency, ground potential gradient, current uniformity, and overheating risk. This invention solves the technical problem of inaccurate performance evaluation of filter field grounding systems under mid-frequency impulse conditions.

The application belongs to the technical field of seedling quality grading, and discloses a quality grading method for Platycladus orientalis seedlings in situ based on electrical impedance spectroscopy, which comprises the following steps: a Platycladus orientalis seedling in-situ measurement device is built for non-destructive measurement of root EIS in situ; an EIS-100 system is used to measure EIS parameters; based on a GSFS-FCM algorithm, input data are clustered, and the optimal cluster number K and the optimal cluster center coordinate matrix are output; according to the optimal cluster number K and the optimal cluster center coordinate matrix, the final membership degree is calculated and the classification is divided through the FCM algorithm, the quality grade to which the Platycladus orientalis seedling belongs is output, and the whole process from electrical impedance measurement to quality grading is completed. The above-mentioned grading method is adopted, the GSFS-FCM algorithm can automatically determine the classification number, automatically find the cluster center, reduce the iteration number of the algorithm, has high accuracy, and breaks away from the traditional grading method which relies on morphological parameters of the aboveground part.

The application belongs to the technical field of new energy vehicle electrical detection and health diagnosis, and discloses a new energy vehicle wire harness aging state online evaluation method based on impedance spectrum analysis. When the target wire harness loop is turned on, a diagnosis excitation signal is injected, and the voltage and current responses of the excitation end and the other end measurement port, the switch state, the wire harness temperature, the loop current and the state of charge signal are synchronously collected. According to the switch state, the transient shielding interval is generated, and the effective sampling points are extracted. The input impedance spectrum and the transmission impedance spectrum are calculated, and the segmented mapping is carried out in combination with the wire harness topology parameters and the segmented propagation time delay parameters. Then, the working condition normalization is carried out based on the working condition reference library, and the segmented aging residual characteristics are obtained. The degradation evaluation model is input, and the segmented aging index, the aging grade and the evaluation confidence are output.

A device may perform impedance spectroscopy on a component under test. The frequency response analyzer circuitry may be coupled to the component under test outside of a current loop supplying an operational current to the component under test. The frequency response analyzer circuitry may drive a variable impedance circuit to generate an oscillating current component within the current loop. The frequency response analyzer circuitry may monitor a frequency response of the component under test to the oscillating current component.

This application relates to the field of radio frequency medical technology, specifically to an intelligent radio frequency energy-assisted regulation method based on impedance spectrum feedback. The method includes: in the radio frequency energy transmission of a medical device, acquiring the capacitance control quantity of the impedance matching network for each frequency band in each control cycle; applying a perturbation to the capacitance control quantity of each frequency band; determining the self-channel response gradient of each perturbed frequency band and the cross-channel coupling gradient of each perturbed frequency band to the remaining frequency bands; determining the coupling loss ratio of each frequency band; obtaining the deterioration trend value of each frequency band; determining the nonlinear coupling risk degree of each frequency band; and updating the capacitance setting value of each frequency band in the next control cycle accordingly, thereby driving the impedance matching network to perform regulation. This application improves the energy transmission efficiency and dynamic matching stability of multi-band radio frequency energy harvesting technology under dynamic nonlinear power environments.

This invention discloses an online compensation method and system for aging of ion-conducting continuous dielectric skin. The method includes the following steps: S1, determining whether the system has entered a non-interactive idle state; S2, constructing a complex impedance spectrum matrix containing amplitude and phase information; S3, outputting an aging drift vector including electrode contact impedance; S4, based on the aging drift vector, updating the mapping weights or sensitivity matrix in the tactile inversion model in real time to compensate for tactile perception deviations caused by material aging; S5, monitoring based on the output electrode contact impedance, and when the contact impedance of any electrode exceeds a predetermined threshold, cutting off the failed electrode channel, and reconstructing the failed area using virtual electrode mapping based on the electric field distribution formed by the remaining electrodes to maintain the integrity of tactile perception. This invention aims to solve the problem of tactile perception drift caused by the evolution of materials and interfaces over time in ion-conducting skin, achieving low-cost online health assessment and adaptive compensation.

This invention discloses a method and system for locating cable defects by fusing reflection coefficient and impedance spectrum, relating to the field of insulation condition diagnosis and assessment technology for power equipment. The method includes: acquiring reflection coefficient spectrum data and impedance spectrum data from the cable's head end; extracting the imaginary part of the reflection coefficient spectrum and the amplitude information of the impedance spectrum and fusing them to obtain fused spectrum data; performing localization processing on the reflection coefficient spectrum, impedance spectrum, and fused spectrum based on windowed Fourier transform to construct a local defect diagnosis function; and analyzing the diagnosis curve to determine the defect location and severity. This invention significantly improves the identification accuracy of the location pulse by coherently enhancing defect information through spectrum fusion, suppressing background fluctuations at non-defect locations. It has advantages such as a location error of less than 0.3%, strong anti-interference ability, and low misjudgment rate, making it suitable for efficient on-site fault detection of power cables.