摘要
本文介绍一种基于R/F转换电路的便携式氨气检测仪。通过多谐振荡器将传感器的等效电阻转化为脉冲信号,由MCU测量得到脉冲频率,再经过运算得出氨气的浓度值。首先介绍它的整体设计思想、工作原理、结构框图,然后把系统划分成若干个功能模块加以详细的介绍。最后对实验的数据进行说明。
The article recommends a portable Ammonia air tester which is based on the classical R/F transition circuit. The sensor＇s equivalent resistance is translated into impulse signal by muhivibrator. The MCU calculates frequency. Then, the concentration of ammonia-air is acquired by interpolation. Firstly, the article presents its entire design idea, operational principle, structure diagram. Secondly, the report presents the system in dividing the whole system into several modules. Finally, the essay explains the data measured.
出处
《微计算机信息》
北大核心
2007年第06S期143-144,122,共3页
Control & Automation
基金
国家自然科学基金(20575024)
关键词
R/F转换
测频
插值
IAP
R/F transition
frequency test
interpolation
IAP
