Papers by Keyword: Data Acquisition (DAQ)

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Authors: Jie Zhang, Ran Bai
Abstract: This paper presents a level measurement system of the frequency modulation continuous wave (FMCW) radar. The procedure is designed by LabVIEW7.0. The system adopts FMCW radar sensor and high-quality data acquisition card. The marine tank level can be measured. For improving the precision of the level measurement, this paper presents an improved algorithm. By using this algorithm, we first adjust the sampling number based on current frequency for meeting the request of the integral period sampling, afterwards, the spectrum is corrected accurately. The experiment is completed by applying the algorithm in LabVIEW. The result shows that the improved algorithm can increase the frequency measure precision for 100 times and more than ordinary algorithms, the measurement error of the level is smaller then 5mm.
Authors: Xue Feng Zhang, Hong Xia Luo
Abstract: The multiplexer act as the inputs of analog signals, enabling multi-channel analog signal acquisition; then filtered through a certain signal processing to ensure the most effective analog signals into the ADC; after conversion, the digital output is saved in the temporary buffer zone of the FPGA. The whole process is controlled by the FPGA. Finally, apply to the DAC-ADC joint debugging, in compare to the results, 14bit precision is guaranteed.
Authors: Guo Fan Chen, Xiao Yan Wang
Abstract: This thesis offers a kind of multiple channels data acquisition device & system based on the sound card. The device converts input signals into frequency signals, and sound card collects the frequency signals. Then the frequency signals collected is restored into input signals by software. By doing so, it resolves the problem which the sound card can’t collect low frequency signals or dc signals. Meanwhile, using a piece of MCU controls the multi-channel analog switch, and the MCU also issues multi-path identification signals to the sound card. So the function of multiple signals collection is achieved.
Authors: Chun Ya Wu, Xian Li Liu, Yi Wen Wang, P. Wang, Yu Wang
Abstract: This study takes virtual instrument technology as the development platform to complete data acquisition, pre-processing, analysis and database storage for three orthogonal components of a cutting force and the corresponding cutting temperature. Simultaneously, single-factor experimentation is adopted to establish empirical formulas of these cutting state parameters for further check analysis. Hence real-time monitoring of cutting process can be implemented to represent cutting-tool wear, failure and rationality of parameter selection in cutting state.
Authors: Wei Cui, Lei Chen, Xing Guang Li
Abstract: A continuous-wave lidar signal acquisition system with USB2.0 interface is present,in this paper. The hardware and the application program has been designed, its sampling rate is up to 1000Msps by flywheel A/D circuit. The signal correlation and accumulation is processed by using FPGA with512M RAM .The experimental results show that it can be used in a variety of systems.
Authors: Xiao Yan Cao, Yong Lei
Abstract: The pulse is the most important, sensitive and reliable source of information about human activity. Pulse wave contains importantly pathological and physiological information. It has an important significance for clinical diagnosis. The system collects the pulse wave through the HK2000B + integrated pulse sensor firstly, then transfers it by the wireless module, finally sends the signal into the computer through the VISA function provided by the LabView which can realize the serial communication. On the computer, use the LabView to program, so that it can realize the pulse signal real-time data acquisition, data filtering, waveform display, storage, alarm and K value extraction and so on. It has an important meaning to promote the pulse remote and objective realization and it has a great practical value.
Authors: Kai Liu, Zhi Wei Zhao, He Long Jiang
Abstract: A wireless data acquisition system based on MSP430F149 is developed for the measurement of microbial fuel cells’ voltage. The main function of this system is to convert the analog input voltage into digital output code, process the digital code, and transfer the data through the GSM network or the USB interface. The core of the data acquisition device is a 16-bit general purpose Texas Instruments ultralow-power microcontroller MSP430F149. As the voltage of a microbial fuel cell is very low, the A/D converter circuit is specifically designed for high precision and high accuracy. A real-time clock is used to achieve timing measurement and the time interval can be set to meet demands. The data collected is transferred through the GSM network. Besides, a Windows environment application developed with Visual C++ can be used to access the data stored in the flash memory through USB interface.
Authors: Xiao Qi Yin
Abstract: Taking the computer sound card instead of current acquisition card as hardware and Labview as software development platform, a kind of sound card data acquisition system with higher sampling precision, middling sampling frequency and better flexibility is designed, it is given an example of six-path analog input multiplexing.It has realized data acquisition of multi-path FDM(frequence division multiplexing) signal. The system has many advantages, for example, high cost performance, strong commonality, and good expansibility.It takes on wider foreground in the fields of engineering measure and laboratory application.
Authors: Ying Ji Liu, Feng Tian Cai, Wei Zhou, Xue Li Zhang, Tian Xia Zhang
Abstract: Aimed at the requirements of engine experimental research,a test system of engine dynamic signal was developed based on virtual instrument technology. The integral structure design of the system was given, the hardware is composed of sensors, signal conditioning module, high-speed data acquisition card and portable computer; the host computer software was developed with DASYLab, a virtual instrumentation tool. Its essential is to make good use of computer to achieve and extend functions of traditional instruments, by comprehensively using technologies of computer, digital signal processing, standard bus and software engineering method, functions of continuous multi channel sampling and multi type signal acquisition, and processing analysis were realized. The field test shows the system works reliably, development and application of this system can provide detailed experiment data and a new way in the field of engine power detection.
Authors: Kai Yuan Meng, Peng Yang, Qing Nian Cao
Abstract: By analyzing the oilfield wireless monitoring system, the paper puts forward an oilfield monitoring system framework based on ZigBee wireless sensor networks on basic of studying ZigBee standard communication protocol. Software and hardware of data acquisition and transmission are designed in this system. The fast network and wireless transmission are realized.
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