摘要
本文提出一种采用声表面波技术的无源无线自动抄表系统,其基本原理是通过磁性舌簧管把表具的读数转换为与舌簧管电气连接的反射栅的短路和断路状态,利用2种状态下阻抗变化所引起的不同反射性,把表具读数反应到对查询脉冲的反射回波上,通过对接收信号的处理得到表具的实际数值。这种方法与现有的自动抄表技术方式相比,具有减少了布线复杂度,无需电源供电、可无线传输、可工作在较恶劣环境以及自动编码录入等优点。实验结果说明本方法能够有效检测表具的量值。
This paper describes a passive wireless metering system based on surface acoustic wave （SAW）. The principle is： firstly the numerical value of the meter is transformed into the ON/OFF states of SAW reflectors that are connected with reed element, then using different reflection characteristics of impedance changes in two states; the numerical reading information of the meter is included in the reflecting radio frequency （RF） pulses, The merits of this metering system are easy-routing, real passive and wireless, can be used in harsh environment and features automatically recording capability.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2007年第10期1886-1890,共5页
Chinese Journal of Scientific Instrument
