作　　者： ; ; ; (张）;

机构地区： 中国科学院安徽光学精密机械研究所合肥物质科学研究院环境光学与技术重点实验室

出　　处： 《数据采集与处理》 2007年第1期121-126,共6页

摘　　要： 根据微弱光离子化信号的检测需要,开发出一种光离子化信号数据采集与处理系统。利用AD7710在微小信号测试方面的优势,以AT89C52为主控对硬件系统的组成和结构进行了设计,实现了电压信号的数据采集与A/D转换、数码显示和数据串口发送。软件系统采用模块化设计,分为数据采集、数据存储和数据串口发送模块等。利用国家标准物质中心配制的标气,系统可以有效检测挥发性有机化合物浓度,检测极低限达到了1 ppb。 According to the detection demand of the weak photoionization signal, a new kind of data acquisition and processing system of photoionization signal is developed. Taking advantage of AD7710 predominance on the weak signal testing, the composition and the structure of the hardware system are designed based on the main control of AT89C52. It realizes the data acquisition and A/D conversion of the voltage signal, the digital display and the data sending of the serial interface. The software system is designed based on the modularization, including the modules of data acquisition, data storage and data sending by the serial interface. Using the standard gas confected by National Standard Research Center for CRM, the system can detect the concentration of volatile organic compounds and the ultra-low detection limit reaches 1 ppb.

关 键 词： 数据采集 光离子化信号 信号检测

领　　域： [自动化与计算机技术] [自动化与计算机技术]