Design of Weak Current Measurement System and Research on Temperature Impact

Subjects: Nuclear Science and Technology >> Nuclear Science and Technology submitted time 2024-01-10

Chuxiang Zhao Sangang Li Rongrong Su Yang Li Mingzhe Liu Qingyue Xue Shan Liao Zhi Zhou Qingshan Tan Xianguo Tuo Yi Cheng

Abstract： To measure the weak currents generated by the neutron ionization chamber, a dedicated weak current measurement system was designed. This system incorporates a second-order low-pass filter circuit and the Kalman filtering algorithm to effectively filter out noise and minimize interference on the measurement results. Testing conducted under normal temperature conditions has demonstrated the system's high precision performance. However, it was observed that temperature variations can affect the measurement performance. To address this issue, data was collected across temperatures ranging from -20 to 70°C, and a temperature correction model was established through linear regression fitting. The feasibility of the temperature correction model was confirmed at temperatures of -5 and 40°C, where relative errors remained below 0.1% after applying the temperature correction. The research indicate that the designed measurement system exhibits excellent temperature adaptability and high precision, making it particularly suitable for measuring weak currents.

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