摘要
基于双铁心磁通门负反馈工作原理,设计了一种数字磁通门磁强计。利用可编程运算放大器实时调节磁通门输出信号的幅值,再经高速12 bit A/D转换成数字信号,用ARM微控制器完成相敏整流和积分运算,用高精度16 bit D/A输出反馈信号,构成闭环系统。实验测试表明,该磁强计的量程为±62 000 nT,分辨率为1.9 nT,线性度达到了2.4×10-4。采用可编程运放结合12 bit A/D实现16 bit分辨率的设计方案,降低了磁强计成本,具有工程应用前景。
This paper describes a dual-core fluxgate magnetometer based on feedback technique which reaches 16-bit resolution with a 12-bit A/D and a Programmable Gain Amplifier（ PGA） . The amplitude of the sensor＆#39;s output signal is real-time controlled by the PGA and is adapted to the input range of the A/D converter. Experiments show that the detection range of the magnetometer is＆#177;62 000 nT,the resolution is 1. 9 nT and the linearity is 2. 4＆#237;10-4 . Along with characteristics of low cost and small size,it has good application prospects in certain fields.
出处
《传感技术学报》
CAS
CSCD
北大核心
2014年第3期308-311,共4页
Chinese Journal of Sensors and Actuators
基金
国家自然科学基金项目(60874101)
教育部博士点基金项目(20126102110031)
关键词
磁通门磁强计
可编程运放
高分辨率
12 bit A/D
fluxgate magnetometer
programmable gain amplifier
12-bit A/D
high-resolution
