Applied Mechanics and Materials Vols. 333-335

Abstract: The paper introduces a compact design to obtain data of more than eight channels. The design bases on the high integration microchip and analogy switch to obtain data. It can transmit the data to computer or microchip by RS485 or USB mode. The design has very small PCB area and low price.

Abstract: Logistics transportation mostly uses foam packing material, the harmless of their production process is the current research focus. Based on National Instrument data collection cardsignal conditioning module and sensors, this paper adopted computer technology to collect data from harmless logistics packaging foam production process, and concentrates on data testing and collection methods. Based on virtual instrument technology, we build a multi-channel universal data collection system. The system exhibits high acquisition efficiency. All of the collected data are the key parameters which are closely related to harmless logistics packaging production, moreover, these parameters are relatively easy to adjust and control in actual production process.

Abstract: A data acquisition system for remote vital sign is designed. The system detect humans vital signs through the body temperature, blood pressure and pulse sensors ,and transmit them to the microprocessor after processing, then the microprocessor send the data to remote monitoring center on receiving the instruction .The monitoring center analysis the data and decide what and how to do. The monitoring centers can response various change of data rapidly and implement real-time rescue guide according to different situations.

Abstract: In order to realize the batched and long-term testing for different models of CNC system, a testing system was built based on the Supervisory Control And Data Acquisition (SCADA) system architecture. It principally adopted the OLE for Process Control (OPC) technology to develop the client application. Through the millisecond access to the OPC server, the client monitors and stores all the field data points. Furthermore, the objective and accurate test data of CNC system reliability is retained. The client has been applied in analyzing the variation of all the field data points. It shows the testing method is effective.

Abstract: In this paper, a high-speed data acquisition system based on FPGA is introduced, which has three different channels with one 5Msps sampling rate and 3×256Mb NAND FLASH. This system is controlled by a large scale FPGA chip from Xilinx Inc., XC3S500E-4FG320C. The collected data are first stored in nonvolatile flash on this fuse in-orbit and imported into a USB disk after down-falling. The main hardware and software design of each module are introduced in detail. Experiment results are shown in the final chapter.

Abstract: This paper introduced a system based on wireless network technology, which achieved node-to-node data collection and transmission. The ZigBee-based wireless network of the system adopted the chip CC2530 of TI company. The system developed applications based on Z-STACK for data collection and wireless transmission, it used VC++ to make a PC software for real-time monitoring of temperature and humidity. The research results show the feasibility of the system, and it would be widely used in the measure field of agriculture.

Abstract: Many applications in Power communication system have a demand of adjustable transmission time delay of high-speed signal. In sequential logic circuit, the control of transmission time delay of high-speed signal can effectively improve the accuracy of clock sampling, as a result, satisfy the constraints between clock signal and periodic data. A method of equivalent sampling based on printed circuit board (PCB) is provided in the article, it realizes equivalent sampling of the data by fixing a group of clock signal delay, thus, increase the accuracy of sampling.

Abstract: In land seismic data acquisition systems, as seismic exploration goes towards to cover large area, a multi-channel structure is needed. In such systems, synchronization is very important, which has great influence on data acquisition and transmission. In this paper, a clock synchronization scheme for seismic exploration is proposed. In the scheme, LVDS serial transmission is used so that the whole system clocks can be made to have the same frequency through clock data recovery technique. Moreover, to compensate the effect caused by transmission delay, an effective algorithm based on PLL phase locked and FPGA logic is proposed in this scheme. The test results show that this scheme meets the system clock synchronization requirements well with the error precision less than 1ns, which fully demonstrates the feasibility and reliability of the scheme. The scheme proposed here can be used in related systems which require clock synchronization.

Abstract: This paper presents an internet-based remote laboratory for process control on double holding water tanks using supervisory control and data acquisition (SCADA) technology. A three layer distributed system supporting web application was proposed. Programmable logic controller, measurement instruments, display instruments and configuration software were used as the main hardware and software to develop the laboratory system. Remote operations by the engineering students show that the laboratory system is useful in helping the students understand the control theory through remote experiments.

Abstract: As we all know FFT(Fast Fourier Transform) can be used analyze and calculate linear and stationary signals, while signals in reality are always nonlinear and transient, so we use HHT(Hilbert-Huang Transform) to detect them. In the past,scholars detect harmonics by applying ARM accompany with FFT. In this article, we use the development board S3C6410-as hardware platform. our processor is ARM, while the main algorithm is HHT.