时间域航空电磁微弱信号数据采集器的研制

Research and Development of the Data Collector for Time Domain Aeronautical Electromagnetic Weak Signal

根据瞬变电磁法原理及其信号特点,研制了时间域航空电磁微弱信号的数据采集器。利用LabVIEW图形化编程语言及其在数据采集、实时数据检测方面的优越性,设计了微弱信号数据采集软件。系统采用浮点放大技术对微弱信号进行动态放大,采用EPM7128芯片控制译码电路,采用TMS320F2812芯片为主控制器对数据进行处理。测试结果表明,仪器能够采集到原始二次场的有效信息,使后期对二次场随时间的变化规律的分析得到保证且性能稳定,仪器动态范围和采样速率满足设计要求。

In accordance with the principle of transient electromagnetic method and its signal characteristics, the data collector for time domain aeronautical electromagnetic weak signal has been researched and designed. Taking advantage of LabVIEW graphical programming language in data acquisition and real time data detection, the data acquisition software for weak signals is designed. In the system, the weak signals are amplified dynamically by using float-point amplifying technology, the encoding circuit is controlled by EPM7128 chip, and the data are processed by TMS320F2812 chip in main controller. The test results show that the effective information of original secondary field can be collected by the instrument, thus the subsequent analysis for the secondary field variation over time is ensured and with stable performance. The instrument＇ s dynamic range and sampling speed satisfy the design requirements.