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基于i.MX RT1052处理器的微小电容测量系统研究与实现 被引量:1

Research and Realization of Micro Capacitance Measurement System Based on i.MX RT1052 Processor
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摘要 针对智慧农业、环境保护、医疗设备等诸多领域中电容式传感器间接测量位移、压力、速度等物理量的实际问题,设计了一种基于恩智浦i.MX RT1052处理器的微小电容测量系统。该系统采用方波振荡电路将电容的变化量转换为频率的变化量,被测电容调理电路输出的信号经过ADC采样,利用快速傅里叶蝶形运算,计算最大幅度值对应的主要频率成分值,从而得出微小电容值。实验结果表明,该微小电容测量系统的最大测量误差为0.46pF,具有抗干扰强、稳定性好、可靠性高等优势,能够有效满足微小电容值检测的实际应用需求。 In view of the practical problems of sensors indirectly measuring displacement,pressure,speed and other physical quantities in many fields such as smart agriculture,environmental protection,medical equipment,etc.,this paper designs a small capacitance measurement system based on NXP i.MX RT1052 processor.The square wave oscillator circuit converts the change in capacitance into a change in frequency.The signal output by the measured capacitance conditioning circuit is sampled by ADC,and the fast Fourier butterfly operation is used to calculate the main frequency component value corresponding to the maximum amplitude value,thereby obtaining the micro-capacitance value.The experimental results show that the maximum measurement error of the micro-capacitance measurement system is 0.46 pF,and it has the advantages of strong anti-interference,good stability,and high reliability.It can effectively meet the practical application requirements for micro-capacitance value detection.
作者 侯志伟 杜青青 包理群 HOU Zhi-wei;DU Qing-qing;BAO Li-qun(College of Electronic and Electrical Engineering,Lanzhou Petrochemical University of Vocational Technology,Lanzhou 730060,China;College of Electronics and Information Engineering,Lanzhou Institute of Technology,Lanzhou 730050,China)
出处 《兰州石化职业技术学院学报》 2021年第4期5-9,共5页 Journal of Lanzhou Petrochemical Polytechnic
基金 甘肃省自然科学基金项目(20JR5RA377) 兰州石化职业技术学院教科研基金项目(KJ2018-02)。
关键词 微小电容 间接测量 方波振荡电路 ADC采样 快速傅里叶变换 micro-capacitance indirect measurement square wave oscillator circuit ADC sampling fast Fourier transform
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