摘要
在实际中时常遇到一些对人的生活有利或有害的微弱的声、光、电信号,而这类微弱信号用常规仪表又无法检测。本文着重讲述对这类微弱信号的检测方法,并举一具体实例:超声波检测仪。对电路的各部分的工作原理予以具体评述。
It is common for people to meet some weak sound,light and electricity signals in daily life. These signals may be helpful or harmful to people＇s life. However,they can not be detected with ordinary meters. This paper emphasizes the method to detect these kinds of signals and specifies the operating principles of different parts of circuits by the example -- ultrasonic wave detector.
出处
《现代电子技术》
2006年第21期65-66,共2页
Modern Electronics Technique
关键词
传感器
选频放大
A/D转换
微弱信号
sensor
selecting wave amplification
A/D transfer
weak signals
