环境电磁污染监测仪设计

The Design of the Monitor for Environment Electromagnetic Pollution

以AVR单片机Atmegai6L为控制器，以磁敏传感器HMCI052L为测量元件，组成环境电磁污染监测系统。二维磁敏传感器HMCI052L可差分输出，通过运算放大器LMV358放大差分信号，利用单片机Atmega 16L的模数转换器转换成数字信号，最后在LCDI602上显示出测量结果。利用磁阻芯片特有的置位／复位功能，有效地消除了因温度漂移和电路参数漂移等共模信号造成的误差，提高了磁敏传感器的灵敏度。通过硬件和软件设计，该系统能够测量磁场参数，测量精度可达到0．6raG．。

The environment electromagnetic pollution monitoring system is composed of the AVR MCU Atmega16L as the controller and the magneto-dependent sensors HMC1052L as the measuring components. In this system, the two-dimensional magnetodependent sensors HMC1052L can output the differential signals that are amplified through the Operational Amplifier LMV358, and then the signals are transformed into digital signals through the ADC of the single-chip microcomputer Atmega16L, and finally the measuring results are displayed on the LCD1602. The SET/RESET functions of magnetoresistanee chip HMC1052L can effectively eliminate the errors caused by the temperature drift, circuit parameters drift of the common-mode signals, thus enhaneing the sensltivity of the magneto-dependent sensors. Through the design of the hardware and software, the system can measure the magnetic field parameters, with a precision of 0.6mG.