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| Anti-disturbance Technology of Corrosion Current Detection System Based on Double Electrode Sensor |
| Received:December 13, 2022 Revised:February 24, 2023 |
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| DOI：10.7643/issn.1672-9242.2023.08.019 |
| KeyWord:double-electrode sensor corrosion current adaptive filtering signal conditioning weak current acquisition simulation |
| Author | Institution |
| CEN Yuan-yao |
Southwest Institute of Technology and Engineering, Chongqing , China |
| LIU Cong |
Southwest Institute of Technology and Engineering, Chongqing , China |
| WAN Jun |
Southwest Institute of Technology and Engineering, Chongqing , China |
| HE Qiong-yao |
Southwest Institute of Technology and Engineering, Chongqing , China |
| HE Jian-xin |
Southwest Institute of Technology and Engineering, Chongqing , China |
| ZHOU Jun |
Southwest Institute of Technology and Engineering, Chongqing , China |
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| Abstract: |
| The work aims to break through the high-precision detection technology of wide-range weak current and design a high-precision I-V conversion micro-current detection circuit for corrosion current detection in metal electrochemical corrosion. By analyzing the stability of the circuit, aiming at the acquisition of weak corrosion current of 100 pA~10 mA, the I-V conversion was realized with a normal safety bias operational amplifier, an 8-gear automatic adjustment circuit based on the ADG708 electronic switch was designed, and the high-precision analog-to-digital conversion was realized by 24-bit ADC; In view of the fact that the weak current collection signal was easily affected by noise, an adaptive filter was designed for signal filtering. The finiteness of the adaptive filter was simulated by MATLAB. The results showed that when collecting i(k)=2sin(2πk) current, the error was reduced from 0.29 mA (1 σ) to 0.003 9 mA (1 σ); Through the current source calibration test system accuracy, the maximum error was 4.7% at 100 pA, the minimum error was 0.049% at 10 mA, the measurement error could be controlled within 5% when the current value was less than 100 nA, and the measurement error could be controlled within 1% when the current value was more than 100 nA. After the introduction of adaptive filter in weak current sampling, the sampling accuracy of the system is significantly improved, breaking through the wide range of corrosion current acquisition technology, and realizing weak current detection. It can be used in evaluation of the rate of metal corrosion through corrosion current. |
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