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Surface displacement or oscillation measurement - uses local interference between two scattered correlated point fields to permit larger stimulated oscillation amplitudes
Surface displacement or oscillation measurement - uses local interference between two scattered correlated point fields to permit larger stimulated oscillation amplitudes
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机译：表面位移或振荡测量-利用两个分散的相关点场之间的局部干扰来允许更大的受激振荡幅度
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摘要
The method measures surface vibrations in the direction normal to the surface using local interference between two correlated point fields produced by scattering light from the surface. It enables unpolished surfaces to be measured and to be stimulated to larger oscillation amplitudes perpendicular to the normal. The average intensity is measured in a region of interference contg. a large number of speckle grains. The two fields are simultaneously produced by two coherent beams incident on the surface at a slightly different angle, and are observed at a slightly different angle dependent on the two angles of incidence.
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