10results about "Current density measurements" patented technology

The application discloses a kind of in-pipe electrode head anode body consumption state real-time monitoring system, it is related to electrode wear monitoring technical field, the system includes data acquisition module, data processing module, modeling module, life prediction analysis module and risk early warning module;By arranging multiple micro-sensing nodes in electrode pipeline interior, current density distribution, potential gradient and electrode-medium interface sense resistance value are collected;After normalization processing, loss characteristic map is constructed, and loss mapping matrix is generated;Supervised learning is carried out using long short-term memory residual network, and real-time consumption state weight value is output;Combined with operating condition parameters, the remaining life of each region is predicted based on Bayesian dynamic model, and critical wear area is labeled;When life is lower than preset threshold and consumption acceleration exceeds set value, output anode head replacement early warning instruction;The application realizes high-precision, dynamic monitoring and intelligent early warning of electrode anode body wear state, with good real-time and adaptability.

A method of controlling corrosion in a metallic structure subjected to cathodic protection is disclosed. The method includes providing a probe that is capable of simulating at least one condition of the metallic structure and measuring at least one characteristic at the probe indicative of one or more states of the probe. At least one parameter of the cathodic protection applied to the metallic structure is controlled in response to the at least one measured characteristic. The disclosure also relates to a control system for controlling a corrosion protection system and to a cathodic protection system applied to an apparatus for monitoring and controlling corrosion in a metallic structure.

Provided is a semiconductor sample evaluation method which includes: acquiring a decay curve by subjecting a semiconductor sample being evaluated to measurement by means of a photoconductive decay method for multiple times while changing a surface charge density; applying signal data processing using a model formula including an exponential decay term and a constant term to at least one decay curve among the decay curves obtained by the multiple measurements; obtaining a recombination lifetime τeff of the semiconductor sample from an exponential decay formula obtained by the signal data processing; obtaining a quadratic function, in which a surface charge density-related value is represented by a variable x and a value related to the constant term is represented by a variable y, from measurement results obtained by the multiple measurements; and obtaining a surface recombination lifetime τs of the semiconductor sample from the quadratic function.

The application discloses a RCS recovery and compensation calculation method based on flexible metal mesh equivalent surface reconstruction, which comprises the following steps: collecting the structure of the metal mesh, the test scene, the fitting state parameters and the measured RCS original data, and forming a standardized parameter database after preprocessing; adopting an adaptive density triangular division algorithm to disassemble the complex curved surface into triangular facets, constructing an electromagnetic reflection model for each triangular facet, correcting the electromagnetic coupling effect of adjacent facets, and integrating the complete equivalent reflection surface; dividing the system error and random error of the RCS measurement, establishing an error calculation model through electromagnetic theory derivation and experimental data fitting, and determining the weight through the entropy weight method; adopting a hybrid compensation strategy to compensate the system error, the random error and the curved surface reconstruction error, and verifying the recovery accuracy and the curved surface adaptability after outputting the accurate RCS data. The method greatly improves the RCS recovery accuracy, can well adapt to the complex curved surface of equipment, and meets the high-precision engineering test demand.

This invention relates to the field of welding technology, and provides a method and system for detecting the current density distribution at the tip of an arc welding electrode. The method includes the following steps: acquiring image information of the electrode tip region during the welding process; generating a grayscale image based on the image information and acquiring grayscale data of the arc region at the electrode tip; establishing a functional relationship between grayscale values ​​and current density; and obtaining the current density distribution at the electrode tip based on the grayscale data of the arc region at the electrode tip and the functional relationship between grayscale values ​​and current density. The method allows for measurement without contact with the electrode, thus avoiding interference with the welding process. Furthermore, the real-time measurement and extremely fast response speed prevent errors caused by electrode burn-out. The established correspondence between image grayscale values ​​and current density results in relatively accurate results.

The application discloses a method for detecting current density distribution of a reference battery, which comprises the following steps: treating copper wires with insulating enamel wires, burying the treated copper wires between positive plates and negative plates, and performing insulation separation treatment to prepare a battery, leading out the copper wires from a steel shell for subsequent testing, charging and discharging the reference battery, detecting voltage changes of corresponding reference electrodes, and obtaining distribution conditions by understanding lithium intercalation and current size of the reference electrodes.

Disclosed in the present invention are a superconducting current density measurement method, a control system, a storage medium, and an electronic device. The method comprises: determining a correspondence between a superconducting current density and a dynamic inductance of a sample under test, and connecting the sample under test to a resonant circuit; obtaining the dynamic inductance, and determining a resonant frequency on the basis of the dynamic inductance; and monitoring the resonant frequency, determining the change in the dynamic inductance on the basis of the change in the resonant frequency, and then obtaining, on the basis of the correspondence, the superconducting current density corresponding to the resonant frequency. The measurement method designed in the present application is not limited by the volume of the sample under test, and by monitoring the change in the resonant frequency with temperature or magnetic field, the change of the superconducting current density can be directly detected, thereby achieving accurate measurement of superconducting current densities of mesoscopic-scale (micro-nano level) samples and overcoming the problem of inaccurate measurement caused by weak signals in the conventional technology.

The present application relates to the technical field of PEM electrolyzer performance testing, and specifically discloses a kind of performance test system of PEM electrolyzer, comprising: maximum current density overestimation problem is identified by water flow rate sensitivity test, and dynamic mass transfer verification and actual operation scene adaptation dynamic working condition test, dynamic mass transfer limit and gas diffusion layer dynamic mass transfer critical value are clear, aging attenuation law of gas diffusion layer dynamic mass transfer critical value is quantified based on historical data, through actual operation verification, the test deviation of mismatched gas diffusion layer real-time aging is corrected, through mismatch test prediction and parameter correction, future parameter mismatch test is positioned in advance and pre-correction is carried out, the problem that existing static test does not consider gas diffusion layer dynamic mass transfer limit and aging influence, leading to maximum current density overestimation is solved, the dynamic adaptation of gas diffusion layer aging state and test parameter is realized, and the test result and actual operation deviation are reduced.

A heat generation simulation device according to an embodiment disclosed herein may include an initial value setting unit configured to set an initial value including information regarding a battery and charge / discharge information, a model generation unit configured to generate a three-dimensional model of the battery, a heat flux identification unit configured to identify an internal heat flux of the battery using an electrochemical model based on the initial value, and an information generation unit configured to generate simulation information related to heat generation of the battery based on the heat flux.

The invention discloses a measuring system for critical current density of a high-temperature superconducting film. The measuring system comprises a signal generator 1, a power amplifier 2, a protective resistor 3, a sampling resistor 4, a digital multimeter 5, an excitation coil 6, a detection coil 7, a lock-in amplifier 8 and a controller 9, the lock-in amplifier 8 comprises a signal generator 1, a reference signal REF interface, an interface A and an interface B; the signal generator 1 is connected with the input end of the power amplifier 2, and the output end of the power amplifier 2 is connected with one end of the protective resistor 3; the other end of the sampling resistor 4 and the other end of the digital multimeter 5 are connected with the detection coil 7. A sample is arranged between the excitation coil 6 and the detection coil 7; the controller 9 is connected with the lock-in amplifier 8, and the lock-in amplifier 8 collects voltage signals of the detection coil 7 and carries out frequency locking filtering. The measured signal-to-noise ratio is high, and the accuracy of a measurement result is improved.