三分量磁通门地磁场检测装置传感器的设计.doc

PAGE PAGE 摘要三分量磁通门地磁场检测装置是应用磁通门传感器对地磁场进行测量的矢量检测装置。与其它类型测磁仪器相比，磁通门传感器具有分辨率高，测量弱磁场范围宽，体积小、重量轻、功耗低，经济性好，能够直接测量磁场的失量和适于在高速运动系统中使用等特点，被广泛应用于各种领域。本文分析了磁通门传感器的工作原理，详细论述了如何采用数字检波的方法进行信号处理.本文还介绍了三分量地磁场检测装置硬件电路的设计和单片机程序。检测装置主要由三分量磁通门传感器、单片机最小系统、A/D数据采集电路和串口电路构成。三分量磁通门传感器检测到磁场的矢量大小，输出信号经过有源滤波器和放大器处理后得到三路幅度与磁场各分量大小成正比的正弦信号。A/D同时对三路信号进行4倍频采样，将两个周期的采样数据传送到单片机，然后单片机通过串行端口将数据发送到计算机，最后由计算机完成数据的处理和分析。关键词 三分量 地磁场 数字检波 数据采集 串行端口The Design of Geomagnetic Field Detection Device Based on Three-component Fluxgate SensorsAbstratThe three-component fluxgate geoamagnetic field detection device is a kind of vector detection device which can measure the geoamagnetic field directly.Compared with other instruments which can measure geomagnetic field,the fluxgate sensor has the virtue of small size,light weight, low power consumption and good economy,is used widely in different fields.This paper introduces the working principle of the fluxgate sensor and the digital demodulation method in detail. The design of hardware circuit of the three-component fluxgate geomagnetic field detection device and progamming of MCU are also introduced in this paper. The detection device consists of three-component fluxgate sensors, MCU system, A/D data acquisition circuit and com port communication circuit. The magnetic vector is detected by the three-component fluxgate sensors,signals output from the senors are processed by active filters and amplifiers.Then there are three sinusoidal signals,whose amplitude are proportional to the magnitude of geomagnetic field component. The A/D convertor produces 4 points sampling signals, and transmits data of two cycles to CPU, then CPU send the data to computer via the com port. Finally,the data is processed and analyzed by computer.Keywords three components geomagnetic field Digital demodulation Data Acquisition Com Port目录 TOC \o 1-3 \f \u 摘要 PAGEREF _Toc232330474 \h 1Abstrat PAGEREF _Toc232330475 \h 21 绪论 PAGEREF _Toc232330476 \h 11.1 研究三分量磁通门地磁场检测装置的