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公开(公告)号:US20110285984A1
公开(公告)日:2011-11-24
申请号:US12800750
申请日:2010-05-21
申请人: Wiiliam R. Christian , Ray C. Delcher , Tong Chen , Mohsen Khoshnevisan , Phillip B. Liescheski , Michael A. Metcalf
发明人: Wiiliam R. Christian , Ray C. Delcher , Tong Chen , Mohsen Khoshnevisan , Phillip B. Liescheski , Michael A. Metcalf
IPC分类号: G01F1/00
CPC分类号: G01P5/26 , G01S7/4812 , G01S7/4916 , G01S7/493 , G01S7/497 , G01S17/58 , G01S2007/4977
摘要: A laser Doppler velocimeter uses self-mixing amplification of backreflections from scatterers below the surface of a flow.A time domain signal is divided into segments that are roughly equal to a transit time of particles through a focus of a laser beam. The segments are connected to a frequency domain through the use of an FFT algorithm to produce frequency domain data segments. Signal-to-noise ratio is enhanced through signal processing techniques using the segments to produce a final enhanced signal spectrum.
摘要翻译: 激光多普勒测速仪使用自流混合放大来自流体表面下方的散射体的反射。 时域信号被分成大致等于通过激光束的焦点的粒子的传播时间的段。 通过使用FFT算法将段连接到频域以产生频域数据段。 通过使用这些段的信号处理技术来提高信噪比以产生最终增强的信号频谱。