便携式电磁噪声采集及分析系统的设计

Design of a Portable Electromagnetic Noise Acquisition Device and Analysis System

为对地面磁共振实验区域进行噪声的快速预评估,开发了一套便携式电磁噪声采集及分析系统。以数据采集卡Net0824为核心,对噪声采集传感器、前置高增益放大电路、选频电路等硬件进行了设计;采用Lab VIEW作为软件开发工具,通过网口通信实现了噪声采集过程的控制、用户交流界面的数据显示及存储。同时,设计了尖峰噪声、工频谐波噪声及随机噪声提取及分析软件。通过在实验室和野外进行测试,验证了采集装置和分析软件的有效性。最后,对长春市文化广场的噪声水平进行了评估,得出文化广场区域,足球场和篮球场南半部分为进行地面核磁共振实验的最佳地点。

We design and develop a portable electromagnetic noise acquisition and analysis system. The acquisition card Net0824 was used as the core,and sensor of noise collection,high gain preamplifier and frequency selection circuit were designed. Using Lab VIEW as a software development tool,the high speed acquisition and storage of electromagnetic noise data was developed through network communication. Moreover,we designed a noise analysis software,which can analyze the spike noise,power frequency harmonic noise and random noise. The testing results show that the system and analysis software are effective. Finally,we evaluated the noise level of Changchun Cultural Square.