4Ermolov. The Reflection of Ultrasonic Waves from Artificial Targets for The Angle probe Testing [M].The Seventh International Conferenceon Nondestructive Testing.
5Dr RC Asher. Uhrasonic Sensors for the Process Industry. Measurement&Contral,19 97,6:138-140.
6Vinogradov. Distributed modular systems for DAQ and control applications. Nuclear Science Symposium Conference Record [J],2001,Vo 1.4:24 98-2503.
8Karl H, Willig A. Protocols and architectures for wireless sensor networks [ M ]. Chichester, West Sussex, England : John Wiley & Sons Press,2005:289 -329.
9Kraus J D, Marhefka R J. Antennas : For all applications [ M].3 rded.北京:电子工业出版社,2006:196-237.