Array corrosion current detection system and method for eliminating space noise

Abstract

The invention provides an array corrosion current detection system and method for eliminating space noise. The system implements the design of a corrosion array sensor, the design of a corrosion current detection circuit and the design of a software control and sampling algorithm. The corrosion array sensor comprises two reference electrodes and 30 working electrodes; the reference electrodes areburied in epoxy resin; the surfaces of the working electrodes are placed in an environment under test, and have corrosion currents as well as electromagnetic interference noise currents equal to theseof the reference electrodes; the corrosion current detection circuit is mainly a measurement circuit for electronic switching of the array electrode and converting the current into voltage, so that the situation that the currents of one reference electrode and the working electrode are synchronously collected in each measurement is ensured. The method provided by the invention is the software control and sampling algorithm, and relates to offset voltage elimination by using a dichotomy and the computation of the corrosion current; the reference electrode signal is subtracted from the synchronously collected working electrode signal to acquire a corrosion current signal of which the space noise is eliminated. According to the system and method provided by the invention, the space noise interference is eliminated and the measurement accuracy is improved.

Description

technical field [0001] The invention relates to the field of embedded circuits, in particular to an array corrosion current detection system and method for eliminating spatial noise. Background technique [0002] Most metal corrosion occurs through electrochemical reactions that occur at the metal-solution interface. Under the corrosion potential, although the net current on the electrode is zero, the corrosion reaction continues at a certain rate. At this time, the anodic current and the cathodic current have the opposite value and are equal to a certain current value (Icor), which is called Is the corrosion current, the unit is A (A). Therefore, metal corrosion can be detected by measuring the corrosion current, which is more sensitive and effective than other methods. [0003] The micro-display electrode detection method is one of the corrosion current measurement methods. A large-area electrode is divided into several micro-electrodes, and then the micro-electrodes are...

AI Technical Summary

Problems solved by technology

Moreover, the corrosion current measurement circuit is also susceptible to some irregular noise or interference signals from internal electronic components. If the influence of these noises and interferences is large enough, the effective signal at the output end of the corrosion circuit may be submerged, and it must be Prevents measurement of corrosion currents

Although the existing technology proposes the measurement of the corrosion current of the array, it neither achieves the measurement of the micro-level corrosion current nor considers the interference of the surrounding space noise. It is difficult for the conventional method to meet the requirements and accuracy of the uA level current measurement.

Images