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Continuous scanning laser Doppler vibrometry and speckle noise occurrence

机译：连续扫描激光多普勒振动法和斑点噪声的发生

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Continous scanning laser Doppler vibrometry (CSLDY) is a type of "spatial field" non-contact technique for measuring structural vibrations by employing a laser Doppler vibrometer whose laser beam is moving continuously on the structure surface. When an LDV is scanned continuously along an arbitrarily line, the LDV output is an amplitude-modulated sine wave according to the structure operational deflection shape. Smooth mode shapes, which can be defined by polynomial functions across the scanned area, may be recovered as a set of polynomial coefficients derived from the LDV output analysed in the frequency domain, which spectrum comprises sidebands centred on the excitation frequency and spaced at multiples of the scan frequency(ies). This paper concentrates its attention to the influence of the speckle noise on the measured data quality, the speckle being an unavoidable phenomenon occurring when a coherent light beam is scattered back from an optically rough surface.
机译：连续扫描激光多普勒振动测定法（CSLDY）是一种“空间场”非接触式技术，用于通过使用激光多普勒振动计来测量结构振动，该激光多普勒振动计的激光束在结构表面上连续移动。当沿任意线连续扫描LDV时，LDV输出是根据结构工作偏转形状的调幅正弦波。可以通过跨扫描区域的多项式函数定义的平滑模式形状，可以作为一组多项式系数来恢复，该多项式系数是从在频域中分析的LDV输出得出的，该频谱包括以激励频率为中心并以的倍数间隔的边带。扫描频率。本文将注意力集中在散斑噪声对测量数据质量的影响上，当相干光束从光学粗糙表面散射回去时，散斑是不可避免的现象。

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