量子电子学报, 2017, 34 (2): 220, 网络出版: 2017-03-29
基于FPGA的腔衰荡信号采集与处理系统设计
Design of cavity ring-down signal acquisition and processing system based on FPGA
光谱学 采集与处理系统 现场可编程门阵列 累加平均 腔衰荡光谱 spectroscopy acquisition and processing system field programmable gate array accumulation average cavity ring-down spectroscopy
摘要
准确获取腔衰荡信号是腔衰荡光谱技术定量探测气体浓度的基础。针对腔衰荡信号的特征, 设计了一种基于FPGA的腔衰荡信号采集与处理系统。系统以FPGA为主控制器,在触发信号激励下, 通过FPGA硬件逻辑实现了腔衰荡信号的高速采集、多次采样结果的对应点累加平均和USB数据传输。 测试表明,系统具有较好的准确度和稳定性(准确度在4敕段?;实际应用于腔衰荡系统时, 设计的采集系统与国外数据采集卡数据的一致性可达到99.4%。结果表明,该数据采集与处理系统 可完全满足腔衰荡信号的采集要求。
Abstract
Accurate acquisition of cavity ring-down signal is the basis of quantitative detection of gas concentration by cavity ring-down spectroscopy. Aimed at the characteristics of cavity ring-down signal, a cavity ring-down signal acquisition and processing system based on FPGA is designed. FPGA is used as main controller of system. The system realizes high speed acquisition of the cavity ring-down signal, accumulation average of the corresponding point and transmission of the USB data under excitation of trigger signal. Tests show that the system has good accuracy and stability (accuracy in the range of 4 per thousand). When applied in cavity ring-down system, the consistency of data from the data processing system and foreign data acquisition card can reach 99.4%. Results show that the data acquisition and processing system can fully meet the acquisition requirements of cavity ring-down signal.
伍军, 凌六一, 谢品华, 胡仁志, 王丹, 陈浩, 杏兴彪. 基于FPGA的腔衰荡信号采集与处理系统设计[J]. 量子电子学报, 2017, 34(2): 220. WU Jun, LING Liuyi, XIE Pinhua, HU Renzhi, WANG Dan, CHEN Hao, XING Xingbiao. Design of cavity ring-down signal acquisition and processing system based on FPGA[J]. Chinese Journal of Quantum Electronics, 2017, 34(2): 220.