System And Method For Characterizing Surface Geometry And Measuring Large Amplitude Oscillations Using Spatial And Temporal Correlations Of High Frequency Displacement Measurements Made With Diffusively Reflected Light Beams

A non-contact method for measuring vibration on a surface of an object, comprising:

• projecting light from two or more light sources towards an area of interest on a surface of an object, where the light projected from the two or more light sources is incident on two or more distinct points on the surface of the object;
• detecting the light diffusely reflected by the surface of the object using at least one detector;
• for each of the at least one detector, determining, by a processor, a change in position of the reflected light detected by a given detector over time, where the processor is interfaced with each of the at least one detector;
• for each of the two or more distinct points on the surface of the object, calculating, by a processor, a series of measurements of vertical displacement of the surface over a period of time from the change in position of the reflected light and using triangulation;
• and
• determining a direction of a wave propagating along the surface at the area of interest using the series of measurements of vertical displacement.

A non-contact method for measuring vibration on a surface of an object, comprising:

• projecting light from one or more light sources towards an area of interest on a surface of an object, where the light projected from the one or more light sources is incident on at least one point on the surface of the object and the projection axis of the light from the one or more light sources is perpendicular to the surface of the object;
• detecting the light diffusely reflected by the surface of the object using one or more detectors;
• for each of the one or more detectors, determining, by a processor, a change in position of the reflected light detected by the detector over time, where the processor is interfaced with each of the one or more detectors;
• for the at least one point on the surface of the object, calculating, by a processor, a series of measurements of vertical displacement of the surface over a period of time from the change in position of the reflected light and using triangulation;
• and
• determining frequency of a disturbance of the surface at the at least one point on the surface and an amplitude of the disturbance using the series of measurements of vertical displacement.