Papers by Author: Yue Peng Yan

Abstract: This paper introduces a simulation work of Time-Domain Reflectometry (TDR). The TDR analysis begins with the propagation of a step or impulse of energy into a system and the subsequent observation of the energy reflected by the system. By analyzing the magnitude, duration and shape of the reflected waveform, the nature of the impedance variation in the transmission system can be determined [3, 4]. In order to understand the principle of time-domain reflection, I built a simulation platform to simulate the test procedure. A programmable signal generator was used to generate an actual narrow pulse physical signal. The reflection signal was captured by a high speed oscilloscope. Test data was read into computer by user-defined software. In the last stage, Matlab was used to carry out the data processing to get the interface position. The comparison between the calculated and the actual interface position deepen the understanding of the principle of time-domain reflection.

Abstract: This paper presents a new approach to build prototypes of Wireless Sensor Network rapidly based on virtual instruments technology. There are two different methods introduced in this paper. One of the two methods uses WSN (short for Wireless Sensor Network) Node and WSN Gateway manufactured by NI (short for National Instruments). The other method adopts Compact RIO (short for Reconfigurable Input and Output) and GPRS (short for General Packet Radio Service) module. Though they are two different methods, they have the same structure. Both of the two methods adopt DAQ (short for data acquisition) card and sensors to acquire specified data. The DAQ card and sensors compose a node which can sense and process data. Different nodes form a local area WSN. Nodes within a local area WSN communicate with each other via ZigBee or other means of communication. The local area WSN can access the Internet via a WSN Gateway or GPRS module. Modular hardware and graphic programming language LabVIEW (short for Laboratory Virtual Instrumentation Engineering Workbench) are adopted in this proposed approach.