基于DSP的数字磁通门传感器设计  

Design of Digital Fluxgate Sensor Based on DSP

作　　者：刘昭元[1] 刘诗斌[1] 

机构地区：[1]西北工业大学电子信息学院,西安710072

出　　处：《传感技术学报》2009年第9期1280-1283,共4页Chinese Journal of Sensors and Actuators

基　　金：国家自然基金资助(60874101);西安应用材料创新基金资助(XA-AM-200707);西北工业大学基础研究基金资助(W018104)

摘　　要：针对传统磁通门传感器模拟电路受温度影响较大的问题,设计了一种基于DSP的数字式闭环磁通门传感器。传感器的模拟电路由AD转换器、DSP和DA转换器取代,滤波、相敏整流和积分等关键环节采用DSP软件编程实现,模拟电路的减少增强了系统的稳定性。传感器的精度和稳定性主要取决于位于反馈回路的DA转换器,采用高分辨率、高稳定的DA转换器芯片可有效提高传感器的温度性能。详细介绍了该磁通门传感器系统的硬件结构、软件设计和实验结果。结果显示:系统零点温度系数为8.9×10-7/℃,灵敏度温度系数为3.9×10-6/℃,25℃时线性度达到了9.4×10-5。In order to solve the problem of thermal stability of traditional fluxgate sensors caused by its analog circuits,a closed-loop digital fluxgate sensor composed of AD convert, DSP and DA convert was designed. The accuracy and stability of such sensors mainly depends on the DA converter used for feed back. A high resolution and precision DA converter is in use to ensure perfect temperature performance. The presented sensor implements filter, phase-sensitive detect, integral and other sections by software. The reduced number of analogue parts increases the robustness against environmental influences （temperature change and electromagnetic disturbances）. Experiments show that the zero temperature coefficient of the system is 8. 9 × 10^-7/℃ ,the sensitivity temperature coeffident is 3.9× 10^-6/℃ ,the linearity reaches 9. 4× 10^-5at 25℃.

关 键 词：数字磁通门传感器 数字滤波 温度系数 相敏整流 罗差 

分 类 号：TP212.13[自动化与计算机技术—检测技术与自动化装置]