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Re-sampling of continuous scanning LDV data for ODS extraction

机译：重新采样连续扫描的LDV数据以进行ODS提取

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The paper presents a method for processing data obtained by Continuous Scanning Laser Doppler Vibrometry (CSLDV) that makes it possible to measure vibrations combining spatial and temporal information. Since the laser continuously scans the structure under test over time and space, it measures a vibration signal modulated by the Operational Deflection Shape (ODS) of the structure. CSLDV time history can then be re-sampled at an arbitrary spatial resolution in order to recover the vibration data at several positions on the trajectory swept by the laser. The main drawback of such method is that the actual sampling rate of the re-sampled vibration signals is dictated by frequencies of the mirrors, which determine the laser scanning speed. The paper presents a method for the automatic recognition of "aliased" natural frequencies and recovery of the actual un-aliased natural frequencies. Once those frequencies are determined, the corresponding ODSs are recovered.
机译：本文提出了一种通过连续扫描激光多普勒振动计（CSLDV）获得的数据的处理方法，该方法可以测量结合了空间和时间信息的振动。由于激光会在时间和空间上连续扫描被测结构，因此它会测量由结构的操作挠度形状（ODS）调制的振动信号。然后可以以任意空间分辨率对CSLDV时间历史进行重新采样，以恢复激光扫过的轨迹上几个位置的振动数据。这种方法的主要缺点是，重新采样的振动信号的实际采样率由反射镜的频率决定，而反射镜的频率决定了激光扫描的速度。本文提出了一种方法，用于自动识别“混叠”的固有频率并恢复实际的非混叠自然频率。一旦确定了这些频率，便会恢复相应的ODS。

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