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    • 74. 发明授权
    • Method and apparatus for detecting surface wave vector dynamics using
three beams of coherent light
    • 使用三束相干光检测表面波矢量动力学的方法和装置
    • US5477324A
    • 1995-12-19
    • US296541
    • 1994-08-26
    • Yves H. BerthelotJacek JarzynskiMing Yang
    • Yves H. BerthelotJacek JarzynskiMing Yang
    • G01B9/02G01P3/36
    • G01B9/02019G01B9/02003G01B9/02022G01B9/02027G01P3/366
    • A method of detecting and measuring separately the components of vector dynamics on the surface of a vibrating object comprises directing three beams of coherent light onto a common spot on the surface. Each of these beams has a known optical frequency. Two are arranged symmetrically about a normal to the surface at the point of incidence and the third is arranged asymmetrically about the normal with respect to both the first and second beams. Superposition of each beam with the others on the surface produces scattered light embodying characteristic beat or carrier signals equal to the difference in frequencies between the beams. Vector dynamics including velocity and displacement of the vibrating surface induces Doppler shifts in the beams, which, in turn results in a modulation of the carrier frequencies resulting from the superposition of the beams. Each carrier frequency is then isolated and demodulated to produce a signal corresponding to various components of the vector dynamics on the surface that cause the modulation. Further analysis extracts information about the frequency and magnitude of resolved vector dynamics on the surface. The method can be applied at several locations on the object's surface to determine vector dynamics at several points simultaneously.
    • 单独检测和测量振动物体表面上的矢量动力学的分量的方法包括将三束相干光引导到表面上的公共点上。 这些光束中的每一个具有已知的光学频率。 两个在入射点处关于表面的法线对称地布置,并且第三相对于第一和第二梁两者围绕法线不对称地布置。 每个光束与其他光束在表面上的叠加产生体现特征拍子或载波信号的散射光,等于光束之间的频率差。 包括振动表面的速度和位移的矢量动力学引起了波束中的多普勒频移,这又导致了由于光束叠加而产生的载波频率的调制。 然后,每个载波频率被隔离和解调,以产生对应于导致调制的表面上的矢量动力学的各种分量的信号。 进一步分析提取关于表面上解析的矢量动力学的频率和幅度的信息。 该方法可以应用在物体表面的几个位置,以同时确定多个点处的矢量动力学。