摘要
通过对中频强磁场空间点测量工况分析和信号处理电路误差计算,找出了产生误差的主要因素.为提高测量仪的精度、实时性和抗干扰能力,采用软硬件相结合优化方法,在信号调理电路中,合理配置前后级的放大倍数和相关电阻以及采用高精度运放,可以大大减少小信号放大引起的误差.采用两种硬件措施和独特平均值滤波方法可以有效抑制信号干扰.通过最小二乘法优化数据拟合参数,进一步减少了整流滤波和程控放大电路引起的误差,整体提高测量仪器性能.对优化后测量仪实验测试结果表明:测量误差小于±1.5%,一致性误差小于1%,测量的实时性也得到提高,取得了较好效果.
By analysing the operating condition of space point measurement of IF strong magnetic field and computing the error of signal processing circuits, it finds out the major factors leading to errors. In order to improve the accuracy of the measuring instrument, real time property and anti-interference ability, an optimization method of combining hardware and software is presented. In the signal regulating circuit, the errors were significantly reduced by reasonably configuring the amplification factors of pre and post stage, relative resistor and using high-precision operational amplifier. Interference was suppressed effectively by employing two hardware and uniquely mean filtering methods. Via the use of the least square method to optimize data fitting parameters, errors caused by rectifier, filter and programmable am- plifier circuit were reduced further, which improved the whole performance. The experimental results obtained by testing the optimized measuring instrument, show that measurement error is less than ± 1.5%, consistency error is less than 1%, and real time property of measurement is also improved, which demonstrates the excellent effects.
出处
《广东工业大学学报》
CAS
2012年第4期27-32,共6页
Journal of Guangdong University of Technology
基金
国家自然科学基金资助项目(10475020)
关键词
中频强磁场
误差分析
优化设计
平均值滤波
放大倍数
intermediate frequency strong magnetic field
error analysis
optimizing design
average filter
magnification
