| 摘要(英) |
The data sampling and signal capture of multiple signals for the reconstruction of original continuous functions is an important function in many instrumentation systems, for example: multi-point sensing for optical interferometry, biomedical monitoring system, and in the measurement of displacements. A multi-channel signal capturing system is developed for optical interferometry for the measurement of displacement and motion. For such a system, it is important that the signals are captured synchronously with a minimum time delay from channel to channel so as to minimize relative phase shift between channels, and, thus, the errors resultant in the displacement measurement, due to signal processing. In order to compare the achievable synchronization by different hardware architectures, a controller built with an ARM core and the other with a FPGA were developed. The FPGA is programmed by GRAFCET with parallelism, while a microcontroller like ARM executes instructions sequentially. Hence, the existence of processing delay between channels competing for processing resource is likely.
Actual tests on the FPGA implementation show that there is no channel synchronization time difference due to system clock. There is only deviations about 11.5ns due to propagation delay in the electric circuits. While there is at least one sampling time step difference between channels in the ARM implementation when the sampling rate is above 400kHz. |
| 參考文獻 |
[1] Rafal. Graczyk, Krzysztof. T. Pozniak, Ryszard. S. Romaniuk, October 12, 2006, “FPGA-based modular configurable controller with fast synchronous optical network”, Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments, Vol 6347.
[2] J.L.Peng, T.A.Liu and R.H.Shu, September 2008, “Optical frequency counter based on two mode-locked fiber laser combs”, Applied Physics B, Volume 92, Issue 4, pp. 513-518.
[3] Philip.Watts, Robert Waegemans, Madeleine Glick, Polina Bayvel, and Robert Killey, 2007, ”An FPGA-Based Optical Transmitter Design Using Real-Time DSP for Advances Signal Formats and Electronic Predistortion”, Journal of Lightwave Technology, Vol. 25, Issue 10, pp. 3089-3099.
[4] Gerald. Francis, Dushan. Boroyevich. Chair, Puchlin. Kachroo, Willian Tranter, March 3, 2004, “A Synchronous Distributed Digital Control Architecture for High Power Converters”
[5] http://www.xilinx.com/ [Xilinx Homepage]
[6] http://www.altera.com/ [Altera Homepage]
[7] M. G. Taylor, “Coherent detection method using DSP for demodulation
of signal and subsequent equalization of propagation impairments,” IEEE
Photon. Technol. Lett., vol. 16, no. 2, pp. 674–676, Feb. 2004.
[8] Eugene Hecht, 2003, “Optics”, 385-431, Addison Wesley
[9] 許克仲，「氣動馬達與電動馬達混合動力之開發與研究」，國立中央大學，碩士論文，June 2011。
[10] 楊偉康，「FPGA-Based氣動馬達控制」，國立中央大學，碩士論文，June 2006。
[11]http://en.wikipedia.org/wiki/Nyquist%E2%80%93Shannon_sampling_theorem[Nyquist- Shannon Sampling theorem] |
[Endnote RIS 格式]
[相關文章]
[文章引用]
[完整記錄]
[館藏目錄]
至系統瀏覽論文 ( 永不開放)
plurk
funp
live
udn
HD
myshare
netvibes
friend
youpush
delicious
baidu
Google bookmarks
del.icio.us
hemidemi
facebook
twitter
google
reddit